Analog Crossover Audio Plug-In Module User's Guide

User's Guide SLAU742–March 2018

Analog Crossover Audio Plug-In Module

The TI Analog Crossover Audio Plug-in Module (SIDEGIG-XOVEREVM) turns TI Audio Class-D amplifier EVM’s into a high quality, two-way speaker amplifier. The plug-in module makes it easy to remove the large and expensive passive crossover found in passive loudspeakers and create a bi-amped, two-way system with improved efficiency and reduced size. The board features a tunable active crossover with a high-pass filter, low-pass filter, baffle step, and delay to create two audio output signals for a tweeter and woofer. There are many advantages of designing active speakers including well-matched and well-tuned audio. This audio plug-in module plugs into an analog input Class-D audio evaluation module (EVM) with an audio interface board (AIB) connector. This document provides information including setup, operation, schematics, bill of materials (BOM) and printed-circuit board (PCB) layout. For questions and support, visit the E2E forums: www.e2e.ti.com. The main contents of this document are: • Hardware description • Hardware implementations • Design documents

Figure 1. Analog Crossover Audio Plug-In Module

Contents 1 Hardware Overview...... 3 2 Analog Crossover Plug-In Module Setup ...... 7 3 Design Files ...... 16

List of Figures 1 Analog Crossover Audio Plug-In Module ...... 1 2 Analog Crossover Module Block Diagram...... 3 3 Class-D Output Drawings ...... 4 4 AIB Connector Pinout ...... 5 5 Connecting Audio Crossover Plug-in Module ...... 8 6 Analog Crossover Plug-in Module Controls ...... 8 7 Low-Pass Filter Schematic ...... 9 8 Low-Pass Filter Frequency Response...... 10 9 Baffle-Step Compensation (BSC) Schematic...... 11 10 Low-Pass Filter Frequency Response Without Baffle-Step Compensation ...... 11 11 Low-Pass Filter Frequency Response With Baffle-Step Compensation ...... 11 12 High-Pass Filter Schematic ...... 12 13 High-Pass Filter Frequency Response ...... 12 14 Cross Section of Two-Way Loudspeaker Requiring Delay Compensation ...... 13 15 All-Pass Filter Schematic...... 14 16 Example of All-Pass Filter Delay ...... 15 17 SIDEGIG-XOVEREVM Schematic Page 1 ...... 16 18 SIDEGIG-XOVEREVM Schematic Page 2 ...... 17 19 Top Overlay ...... 18 20 Bottom Overlay ...... 18 21 SIDEGIG-XOVEREVM Board Dimensions ...... 18

List of Tables 1 Plug-in Module Compatibility ...... 3 2 AIB Connector Pin Descriptions ...... 5 3 Component Values for Different Low-Pass Filter Cutoff Frequencies ...... 10 4 Component Values for Different High-Pass Filter Cutoff Frequencies ...... 13 5 Approximate Additional Time Delays With Corresponding Component Values and Approximate Frequency When Delay Decreases by 10% ...... 15 6 BOM...... 19 Trademarks All trademarks are the property of their respective owners.

2 Analog Crossover Audio Plug-In Module SLAU742–March 2018 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated www.ti.com Hardware Overview 1 Hardware Overview The Analog Crossover Plug-in Module allows an audio Class-D amplifier to drive separate bass and tweeter channels from a single RCA input source. The board includes an input volume control, high-pass filter, low-pass filter with optional baffle step compensation, optional all-pass filter for delay adjustment, as well as standard banana plug jacks for an external power supply (see Figure 2). A single RCA jack is used for input to the board.

Fourth-Order Third-Order Attenuation All-Pass Time High-Pass Filter and Buffering Delay

Tweeter Output

Audio Input Input Buffer Woofer Output

Baffle-Step Fourth-Order Compensation Pass Filter Figure 2. Analog Crossover Module Block Diagram

1.1 Features The analog crossover module includes the following features: • Compatible with the TI Audio Plug-in Module Ecosystem • Standard RCA input jack • Self-powered when connected to an audio Class-D EVM • Differential outputs for both high and low channels which can directly drive the audio Class-D EVM • Standard banana plug jacks for using an optional, external dual-rail supply for the board • Potentiometers for input volume control as well as separate high- and low-channel volume control • Fourth-order active high-pass filter • Optional fourth-order active low-pass filter • Optional baffle-step compensation • Optional all-pass filter for delay adjustment • Supports two-channel bridge-tied load (BTL) Class-D amplifier output

1.2 Class-D EVM Compatibility The Analog Crossover Plug-in Module is compatible with analog input Class-D EVMs designed with the audio interface board (AIB) connector. See the SIDEGIG-XOVER tools folder on TI.com for a list of compatible Class-D EVMs.

Table 1. Plug-in Module Compatibility

SUPPORTED CLASS-D SPEAKER PLUG-IN MODULE OUTPUT TYPE CLASS-D EVM INPUT TYPE CONFIGURATIONS 2x differential analog Analog 2x BTL

SLAU742–March 2018 Analog Crossover Audio Plug-In Module 3 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated Hardware Overview www.ti.com 1.2.1 Audio Plug-In Module Output Types The Analog Crossover Plug-in Module drives two differential analog outputs.

1.2.2 Class-D EVM Input Type The Analog Crossover Plug-in Module is only compatible with analog input Class-D EVMs with the AIB connector.

1.2.3 Supported Class-D Speaker Configurations Configure the connected Class-D EVM as a stereo BTL output because the Analog Crossover Plug-in Module has two differential outputs (see Figure 3).

OUT-A

OUT-B

Class-D Amplifier

OUT-C

OUT-D

2x BTL

Figure 3. Class-D Output Drawings

NOTE: Consult the Class-D EVM user’s guide for proper Class-D EVM configuration.

4 Analog Crossover Audio Plug-In Module SLAU742–March 2018 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated www.ti.com Hardware Overview 1.3 AIB Pinout This section shows the AIB connector pinout used by the Analog Crossover Audio Plug-in Module (see Figure 4). Any pin names not listed in Table 2 are unused by this plug-in module.

Amp Out A 1 2 Amp Out B

3 4 GND

5 6

7 8

+12V 9 10

Analog IN_A / MCLK 11 12

Analog IN_B / BLCK 13 14

Analog IN_C / LRCLK 15 16

Analog IN_D / DIN 17 18

19 20

GND 21 22 GND

23 24

25 26

Amp Out C 27 28 Amp Out D

Figure 4. AIB Connector Pinout

Table 2. AIB Connector Pin Descriptions

AUDIO PLUG-IN AUDIO EVM PIN NUMBER FUNCTION DESCRIPTION MODULE INPUT/OUTPUT INPUT/OUTPUT Speaker-level output from audio Class-D EVM 1 AMP-INA (single-ended (SE) or one side of BTL); used for O I post-filter feedback Speaker-level output from audio Class-D EVM (SE 2 AMP-INB O I or one side of BTL); used for post-filter feedback Ground reference between audio plug-in module 4 GND — — and audio Class-D EVM 12-V supply from EVM; used for powering audio 9 12V O I plug-in module Positive (+) analog input Class-D EVM (IN_A and 11 Analog IN_A IN_B are driven differentially by the Analog I O Crossover Plug-in Module) Negative (–) analog input for high-frequency channel to audio Class-D EVM (IN_A and IN_B are 13 Analog IN_B I O driven differentially by the Analog Crossover Plug- in Module) Postive (+) analog input for low-frequency channel to audio Class-D EVM (IN_C and IN_D are driven 15 Analog IN_C I O differentially by the Analog Crossover Plug-in Module) Negative (–) analog input for low-frequency channel to audio Class-D EVM (IN_C and IN_D are 17 Analog IN_D I O driven differentially by the Analog Crossover Plug- in Module)

Table 2. AIB Connector Pin Descriptions (continued) AUDIO PLUG-IN AUDIO EVM PIN NUMBER FUNCTION DESCRIPTION MODULE INPUT/OUTPUT INPUT/OUTPUT Ground reference between audio plug-in module 21 GND — — and audio Class-D EVM Ground reference between audio plug-in module 22 GND — — and audio Class-D EVM Speaker-level output from audio Class-D EVM (SE 27 AMP-INC O I or one side of BTL); used for post-filter feedback Speaker-level output from audio Class-D EVM (SE 28 AMP-IND O I or one side of BTL); used for post-filter feedback

6 Analog Crossover Audio Plug-In Module SLAU742–March 2018 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated www.ti.com Analog Crossover Plug-In Module Setup 2 Analog Crossover Plug-In Module Setup This section describes the setup and use of the Analog Crossover Audio Plug-in Module.

2.1 Preparation and First Steps for Setup The Analog Crossover Audio Plug-in Module plugs into an analog input audio Class-D EVM using the AIB connector. To plug the board in, simply align the AIB connector on the Analog Crossover Plug-in Module and the audio EVM and press into place. No additional setup is required. The plug-in module automatically powers up when the Class-D EVM is powered. 1. Configure the Class-D amplifier EVM in BTL output mode to support the analog crossover module. 2. While the Class-D amplifier EVM is not powered, connect the analog crossover module to the AIB connector (see Figure 5). Take care not to misalign the connector, otherwise damage to the plug-in module or Class-D EVM can occur. 3. Connect the EVM A/AB BTL channel to a tweeter or mid-range speaker channel. 4. Connect the EVM C/CD BTL channel to a bass speaker channel. 5. Make sure that J10 (“VCC SEL”) is connected to the U10 pin and that J11 (“VEE SEL”) is connected to the U11 pin. Power the Class-D EVM and the plug-in module is automatically powered. The plug-in module provides its own +10-V and –10-V supply rails. However, if the designer wishes to increase the supply rails with an external supply to increase the maximum output available from the plug-in module, follow steps 5a through 5f; otherwise, proceed to step 6. 1. Connect the ground of the external supply to the banana jack labeled “GND” on the plug-in module. 2. Connect the positive supply line of the external supply to the banana jack labeled “Vcc” on the plug-in module. Note the absolute maximum voltage of 18 V on this pin. Do not exceed this level; otherwise, damage may occur to the plug-in module. 3. Connect the negative supply line of the external supply to the banana jack labeled “Vee” on the plug-in module. Note the absolute minimum voltage of –18 V on this pin. Do not exceed this level; otherwise, damage may occur to the plug-in module. 4. Move the jumper on VCC SEL to the J7 pin. 5. Move the jumper on VEE SEL to the J8 pin. 6. Turn on the external power supply. 6. Plug in a standard RCA cable into the plug-in module. 7. Adjust the potentiometers for each channel to set the overall desired volume.

Figure 5. Connecting Audio Crossover Plug-in Module

2.2 Analog Crossover Plug-In Module Controls and Circuits This subsection describes the controls and use of the Analog Crossover Audio Plug-in Module. Figure 6 shows the Analog Crossover Plug-in Module controls.

Figure 6. Analog Crossover Plug-in Module Controls

8 Analog Crossover Audio Plug-In Module SLAU742–March 2018 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated www.ti.com Analog Crossover Plug-In Module Setup 2.2.1 Low-Pass Filter The optional fourth-order low-pass filter attenuates all signals with frequencies above a certain cutoff, which is determined by the component values. The low-pass filter circuit also includes R42 for its own separate volume control. Connect the jumper on J5 to "Bypass" instead of "Enable" to bypass the low- pass filter together with the BSC circuit. Figure 7 shows the schematic of the low-pass filter.

LPF C22 LOW-PASS FILTER C23 DNPDNPTP3

0.1µF 0.1µF

4 U7B Low

4 R37 5 OPA1602 U8A VEE R38 R39 Frequency 1.40k 7 3 OPA1602 (Woofer) 6 845 1.40k 1 C24 2

4 0.047µF C25 R42 U8B 8 0.047µF 5 OPA1602 8 7 10k 6

Tthe low-pass filter circuit comprises two second-order Sallen-Key low-pass filters (U7B and U8A), which combine together to produce a fourth-order low-pass filter. R36 = R38, R37 = R39, C22 = C23, and C24 = C25; therefore, the transfer function for the low-pass filter can be written as follows in Equation 1. 2 æ 1 ö H() s = ç ÷ ç1 sC R R s2 R R C C ÷ è +24() 36 + 37 + 36372224 ø (1) The following Equation 2 gives the cutoff frequency for the low-pass filter. 1 ƒ = c p 2 R36 R 37 C 22 C 24 (2) When using the component values as shown in the Figure 7 schematic, the low-pass filter has a cutoff frequency of approximately 2.1 kHz. As is the case with the high-pass filter, change the corresponding components on each filter if a change to the cutoff frequency is desired. So, if changing the value of R37, then be sure to also change R39 to the same value. Just like the previous high-pass filter, each of the second-order filters in the low-pass filter circuit has a Q factor, which determines how much peaking occurs in the frequency response of the circuit around the cutoff frequency. As before, the value of the Q factor must be kept below 1 and roughly above 0.5, but should preferably be around 0.7. The current value of the Q factor for each second-order low-pass filter is 0.707. The following Equation 3 gives the Q factor.

RCC37 22 24 Q = CCR ()22+ 24 36 (3)

SLAU742–March 2018 Analog Crossover Audio Plug-In Module 9 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated Analog Crossover Plug-In Module Setup www.ti.com Figure 8 shows the frequency response of the low-pass filter on the plug-in module.

-10

-20

-30

Magnitude (dB) -40

-50

-60 20 200 2000 20000 Frequency (Hz) D002 Figure 8. Low-Pass Filter Frequency Response

Table 3 shows some of the suggested component values for different cutoff frequencies for the low-pass filter.

Table 3. Component Values for Different Low-Pass Filter Cutoff Frequencies

APPROXIMATE CUTOFF HIGH-PASS FILTER COMPONENT VALUES FREQUENCY R36 AND R38 R37 AND R39 C22 AND C23 Cx4 AND C25 300 Hz 6.01 kΩ 10.00 kΩ 100 nF 47 nF 600 Hz 3.01 kΩ 4.99 kΩ 100 nF 47 nF 900 Hz 2.00 kΩ 3.32 kΩ 100 nF 47 nF 1200 Hz 1.50 kΩ 2.49 kΩ 100 nF 47 nF 1500 Hz 1.21 kΩ 2.00 kΩ 100 nF 47 nF 1800 Hz 1.00 Ω 1.65 kΩ 100 nF 47 nF 2100 Hz 866 Ω 1.43 kΩ 100 nF 47 nF

2.2.2 Baffle-Step Compensation The optional baffle-step compensation (BSC) circuit allows correction of the frequency response of the woofer. Due to the physical construction of loud speakers, high frequencies are directed forward to the listener, while low frequencies are not only directed forward, but also pass around the speaker to the rear. This relationship causes higher frequencies to sound louder. Baffle-step compensation is required in loud speakers to reduce the sound pressure of those higher frequencies compared with lower frequencies. The BSC flattens the sound pressure level across frequencies for a better listening experience. The BSC is optional and the designer can disable this by removing the jumper across J6 (labeled “Baffle Step”), in which case the circuit becomes a unity-gain inverting amplifier. Figure 9 shows the schematic for the BSC circuit.

R28 J6 11.8k Step Baffle

C19 R31 11.8k 0.1µF R34 11.8k VCC

U7A

8 OPA1602 2 1 3 DNPDNP VEE

4 TP4 GND SB BAFFLE STEP COMPENSATION

The BSC circuit has the following transfer function shown in Equation 4. Ræ 1+ sR C ö H s = - 34 31 19 () Rç 1 s R R C ÷ 28è+ () 34 31 19 ø (4) Equation 5 and Equation 6 give the pole and zero frequencies, respectively. 1 ƒp = 2p() R34 + R 31 C 19 (5) 1 ƒ = z p 2 R31 C 19 (6) When using the current component values, as shown in Figure 9, the pole and zero frequencies of the BSC are 67.4 Hz and 134.9 Hz, respectively. Figure 10 and Figure 11 show the frequency response with and without the BSC.

10 10

0 0

-10 -10

-20 -20

-30 -30

Magnitude (dB) Magnitude (dB) -40 -40

-50 -50

-60 -60 20 200 2000 20000 20 200 2000 20000 Frequency (Hz) Frequency (Hz) D002 D003 Figure 10. Low-Pass Filter Frequency Response Figure 11. Low-Pass Filter Frequency Response Without Baffle-Step Compensation With Baffle-Step Compensation

SLAU742–March 2018 Analog Crossover Audio Plug-In Module 11 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated Analog Crossover Plug-In Module Setup www.ti.com 2.2.3 High-Pass Filter The fourth-order high-pass filter attenuates all signals with frequencies below a certain cutoff, which is determined by the filter component values. The high-pass filter schematic in Figure 12 comprises two second-order Sallen-Key high-pass filters (U1B and U2A), which combine to create a fourth-order filter and provide a rapid attenuation at frequencies below the cutoff. R1 = R2, R10 = R11, C3 = C5, and C4 = C6; therefore, the transfer function for the high- pass filter can be written as follows in Equation 7. 2 æs2 R R C C ö H() s = ç1 10 3 4 ÷ ç1 sR C C s2 R R C C ÷ è+1() 3 + 4 + 1 10 3 4 ø (7) The following Equation 8 gives the cutoff frequency of the filter. 1 ƒc = p 2RR1 10 C 3C 4 (8)

R1 R2 590 590 VEE

4 U1B C3 C4 4 5 OPA1602 C5 C6 U2A 7 3 OPA1602 0.1µF 0.1µF 6 1 R10 0.1µF 0.1µF 2 1.30k 8 R11 VCC

1.30k 8

GND

HIGH-PASS FILTER GND

Using the component values as shown in the previous Figure 12 schematic, the filter has a cutoff frequency of approximately 1.8 kHz. The designer can modify the cutoff frequency if desired by changing one of the components on the first filter and the corresponding component on the second filter. For example, if changing the value of R10, then be sure to change R11 to the same value. Figure 13 shows the frequency response of the high-pass filter.

-10

-20

-30

-40

Magnitude (dB) -50

-60

-70 20 200 2000 20000 Frequency (Hz) D001 Figure 13. High-Pass Filter Frequency Response

12 Analog Crossover Audio Plug-In Module SLAU742–March 2018 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated www.ti.com Analog Crossover Plug-In Module Setup The Q factor for each second-order filter is another value that is important to the filter functionality and it determines how much and how sharply the frequency response of the filter peaks around the cutoff frequency. The Q factor must be less than 1 to reduce this peaking, but it must also be kept above 0.5. Keeping the Q factor around 0.7 is preferable and the current Q factor for the high-pass filter is 0.742. Equation 9 shows the Q factor of each second-order filter.

RR1 10C 3 Q = RR C ()1+ 10 4 (9) Table 4 shows some suggested component values for different cutoff frequencies for the high-pass filter.

Table 4. Component Values for Different High-Pass Filter Cutoff Frequencies

APPROXIMATE CUTOFF HIGH-PASS FILTER COMPONENT VALUES FREQUENCY (Hz) R1 AND R2 R10 AND R11 C3 AND C5 C4 AND C6 300 3.57 kΩ 7.87 kΩ 100 nF 100 nF 600 1.75 kΩ 3.92 kΩ 100 nF 100 nF 900 1.18 kΩ 2.61 kΩ 100 nF 100 nF 1200 887 Ω 1.96 kΩ 100 nF 100 nF 1500 715 Ω 1.58 kΩ 100 nF 100 nF 1800 590 Ω 1.3 kΩ 100 nF 100 nF 2100 511 Ω 1.1 kΩ 100 nF 100 nF

2.2.4 All-Pass Filter Use the optional all-pass filter to add a specific time delay to the high-frequency signal path so that the high-channel and low-channel sounds can be matched in time to compensate for any delay that results from distance offsets between the tweeter and the woofer transducers. Figure 14 shows a physical representation of this alignment difference.

A P

B C

D Figure 14. Cross Section of Two-Way Loudspeaker Requiring Delay Compensation

SLAU742–March 2018 Analog Crossover Audio Plug-In Module 13 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated Analog Crossover Plug-In Module Setup www.ti.com Enable the all-pass filter by connecting the jumper on J1 (labeled “Delay”) to the “EN” pin. If the J1 Delay jumper remains connected to the “Bypass” pin, the all-pass filter is skipped, no delay is added, and the output from the high-pass filter functions as the only output for the high channel. Control the level of the high-pass output through the potentiometer R24 at the output of the all-pass filter. Figure 15 shows the schematic of the all-pass filter.

C9 APF R52 R18 C10 DNPDNPTP2 1.00k 1.00k 0.1µF 10pF VCC R19 R20 U5A 8 422 1.00k High OPA1602 U5B

8 OPA1602 U6A Frequency 2 C11 8 1 R21 6 OPA1602 (Tweeter) 3 7 R22 2 221 R23 0.1µF 5 475 1 VEE 3 1.00k R24

GND 4 1k C12 R25 R26 GND 332 1.00k R27 0.1µF 1.00k

GND ALL-PASS FILTER

The transfer function of the all-pass filter is a third-order function. The all-pass filter passes the signal with a constant gain. However, for the gain on the all-pass filter to stay at unity, R52 must equal R18 and R20 must equal R26. The purpose of the all-pass filter is to add in a time delay to the high-frequency signal; therefore, the formula for the time delay added by the all-pass filter as a function of frequency is given in Equation 10. To simplify the equation, first make a few assumptions about the circuit. Assume that R52 and R18 are always the same value, C9 and C11 are always the same value, R26 and R20 are the same value as well, and that R26 and R20 remain unchanged. Also, the first-order low-pass filter created by U6A has a cutoff frequency of approximately 16 MHz; therefore, assume that it remains unmodified and that its contribution to the time delay is negligible and can be ignored. After making these assumptions, simplify the time delay function to the following Equation 10. æ ö 2R C 1 ç 2R C 16p2 R 2 R C 3 ƒ2 ÷ tƒ =25 12 + 21 9+ 21 19 9 () 2 2ç 2 2 2 2 ÷ 2 2 2 1+() 2 p R25 C 12 ƒ æ4p R Cƒ ö ç1- 4 p R21 R 19 C 9 ƒ 1- 4 p RRC ƒ ÷ 1 + ç21 9 ÷ è ()21 19 9 ø ç2 2 2 ÷ è1- 4 p R21 R 19 C 9 ƒ ø

æ é R26 ù2 éR26 ù 3 2 ö ç ê2R21- R 19 úC9 8p ê 2R 21 - R 19 ú R 21 R 19 C 9 ƒ ÷ 1 R R ç ë 22 û+ ë22 û ÷ 2 ç 2 2 2 2 ÷ æéR ù ö 1- 4 p R21 R 19 C 9 ƒ 2 2 2 26 ç ()1- 4 p R21 R 19 C 9 ƒ ÷ ç2pê 2R21 - R 19 ú C 9 ƒ ÷ ç ÷ R è ø 1 + çë22 û ÷ ç1- 4 p2 R R C 2 ƒ2 ÷ ç21 19 9 ÷ ç ÷ è ø (10) Find the approximate value for the low-frequency time delay by setting f = 0 in Equation 10. Using the current component values as shown in Figure 15, the all-pass filter has a delay of approximately 155 μs. Table 5 also provides a few suggested component values for varying amounts of delay.

14 Analog Crossover Audio Plug-In Module SLAU742–March 2018 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated www.ti.com Analog Crossover Plug-In Module Setup Table 5. Approximate Additional Time Delays With Corresponding Component Values and Approximate Frequency When Delay Decreases by 10%

APPROXIMATE COMPONENT VALUES ESTIMATED FREQUENCY FOR TIME DELAY R52 AND R18 C12 R25 R21 C9 AND C11 R19 R22 R26 AND R20 10% DROP IN DELAY 30 µS 1000 Ω 10 nF 649 Ω 422 Ω 10 nF 806 Ω 475 Ω 1000 Ω 20300 Hz 60 µS 1000 Ω 22 nF 590 Ω 383 Ω 22 nF 732 Ω 475 Ω 1000 Ω 10100 Hz 90 µS 1000 Ω 47 nF 412 Ω 576 Ω 22 nF 1100 Ω 475 Ω 1000 Ω 6750 Hz 120 µS 1000 Ω 47 nF 549 Ω 365 Ω 47 nF 698 Ω 475 Ω 1000 Ω 5050 Hz 150 µS 1000 Ω 100 nF 324 Ω 453 Ω 47 nF 866 Ω 475 Ω 1000 Ω 4050 Hz 180 µS 1000 Ω 100 nF 442 Ω 287 Ω 100 nF 456 Ω 499 Ω 1000 Ω 4300 Hz 210 µS 1000 Ω 100 nF 499 Ω 324 Ω 100 nF 549 Ω 499 Ω 1000 Ω 3450 Hz 240 µS 1000 Ω 100 nF 604 Ω 383 Ω 100 nF 604 Ω 499 Ω 1000 Ω 3200 Hz 270 µS 1000 Ω 100 nF 681 Ω 432 Ω 100 nF 681 Ω 499 Ω 1000 Ω 2850 Hz

Figure 16 shows an example of added phase delay by the all-pass filter block to the high-frequency channel.

Figure 16. Example of All-Pass Filter Delay

NOTE: The input signal (yellow) is a 1.8-kHz sine wave and the output from the analog crossover module is shown in pink.

See more information about how to determine the necessary time delay, as well as more information about the analog crossover module, in Analog, Active Crossover Circuit for Two-Way Loudspeakers (TIDU035).

2.2.5 Input The input to the Analog Crossover Plug-in Module is a single channel, single-ended audio source.

2.2.6 Volume Knob Control the master volume on the analog crossover module with R17, which is the potentiometer next to the RCA input jack.

3.1 Schematic Figure 17 and Figure 18 show the SIDEGIG-XOVEREVM schematics.

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/17 /18 /47 /48 0.1µC 0.1µC 0.1µC 0.1µC ë99 ë// ë99 ë// ë99 ë// ë99 ë// ë99 ë// ë99 ë// W5 Db5 [tC w28 W6 9b/.òt!{{ 11.8k Db5 Db5 Db5 Db5 {tep .affle /13 /14 /41 /42 /44 /43 /46 /45 /49 /50 /51 /52 0.1µC 0.1µC 0.1µC 0.1µC 0.1µC 0.1µC 0.1µC 0.1µC 0.1µC 0.1µC 0.1µC 0.1µC /19 1 2 3 w30 /20 w29 w31 hÜÇ/ 7.50k 220pC 0 11.8k 0.1µC Db5 Db5 Db5 Db5 Db5 Db5 Db5 Db5 Db5 Db5 Db5 Db5 w32 w33 w34 /21 180pC 100k !at-Lb5 1.00k 11.8k ë// [tC ë// Ü9 /22 [hí t!{{ CL[Ç9w /23 Çt3 ë99 3 ë+ Ü7! Db5 8 ht!1602 0.1µC 0.1µC w35 8 5 4 ëLb+ ëhÜÇ- 2 Ü7. [ow 4 1.00k 1 w36 w37 5 ht!1602 Ü8! ë99 2 w38 w39 Creq ëh/a 3 845 1.40k 7 3 ht!1602 6 1 (íoofer) w40 1 4 w41 845 1.40k ëLb- ëhÜÇ+ hÜÇ5 ë99 /24 2 4 1.00k 0 4 Çt4 0.047 C /25 w42 Ü8. µ 7 9b!.[9 9t 9 Db5 {. 8 0.047 µC 5 ht!1602 w43 8 7 Db5 6 100k ë- 10k 6 .!CC[9 {Ç9t ht!16325Dbw ë// Db5 /hat9b{!ÇLhb Db5 8 Db5 /26 Db5 Db5 /27 180pC !at-Lb/ 220pC w45 w44 7.50k 1.00k Figure 18. SIDEGIG-XOVEREVM Schematic Page 2

SLAU742–March 2018 Analog Crossover Audio Plug-In Module 17 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated Design Files www.ti.com 3.2 Board Layouts Figure 19 and Figure 20 show the SIDEGIG-XOVEREVM layout images.

Figure 19. Top Overlay Figure 20. Bottom Overlay

3.3 Board Dimensions Figure 21 shows the SIDEGIG-XOVEREVM board dimensions.

Figure 21. SIDEGIG-XOVEREVM Board Dimensions

18 Analog Crossover Audio Plug-In Module SLAU742–March 2018 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated www.ti.com Design Files 3.4 Bill of Materials Table 6 shows the SIDEGIG-XOVEREVM BOM.

Table 6. BOM

PACKAGE ALTERNATE PART ALTERNATE DESIGNATOR QTY VALUE DESCRIPTION PART NUMBER MANUFACTURER REFERENCE NUMBER MANUFACTURER !PCB1 1 Printed Circuit Board AMPS004 Any 4 220pF 0402 C1005C0G1H221F050B TDK C1, C7, C20, C26 CAP, CERM, 220 pF, 50 V,+/- 1%, C0G/NP0, 0402 A C3, C4, C5, C6, C9, 10 0.1uF 1206 C1206C104J3GACTU Kemet C11, C12, C19, CAP, CERM, 0.1 µF, 25 V,+/- 5%, C0G/NP0, 1206 C22, C23 C10 1 10pF CAP, CERM, 10 pF, 50 V,+/- 5%, C0G/NP0, 0603 0603 06035A100JAT2A AVX C13, C14, C15, 18 0.1uF 0603 0603YC104JAT2A AVX C16, C17, C18, C41, C42, C43, CAP, CERM, 0.1 µF, 16 V,+/- 5%, X7R, 0603 C44, C45, C46, C47, C48, C49, C50, C51, C52 C24, C25 2 0.047uF CAP, CERM, 0.047 µF, 50 V,+/- 5%, C0G/NP0, 1206 1206 GRM31M5C1H473JA01L MuRata 2 0.01uF CAP, CERM, 0.01 µF, 10 V,+/- 10%, X7R, AEC-Q200 Grade 0201 CGA1A2X7R1A103K030 TDK C28, C35 1, 0201 BA C29, C33, C34, C39 4 10uF CAP, CERM, 10 µF, 25 V,+/- 10%, X7R, 1206 1206 885012208069 Wurth Elektronik C30, C31 2 4.7uF CAP, CERM, 4.7 µF, 16 V,+/- 10%, X5R, 1206 1206 C1206C475K4PACTU Kemet C32, C37 2 0.01uF CAP, CERM, 0.01 µF, 6.3 V,+/- 10%, X5R, 0201 0201 GRM033R60J103KA01D MuRata C36 1 10uF CAP, TA, 10 µF, 25 V, +/- 10%, 1.5 ohm, SMD 6032-28 293D106X9025C2TE3 Vishay-Sprague C38 1 100uF CAP, TA, 100 µF, 20 V, +/- 10%, 0.5 ohm, SMD 7343-43 293D107X9020E2TE3 Vishay-Sprague C40 1 2.2uF CAP, TA, 2.2 µF, 25 V, +/- 10%, 6.3 ohm, SMD 3216-18 293D225X9025A2TE3 Vishay-Sprague H1, H2, H3, H4 4 Machine Screw, Round, #4-40 x 1/4, Nylon, Philips panhead Screw NY PMS 440 0025 PH B&F Fastener Supply H5, H6, H7, H8 4 Standoff, Hex, 1"L #4-40 Nylon Standoff 1902E Keystone J1, J5, J10, J11 4 Header, 100mil, 3x1, Gold, TH PBC03SAAN PBC03SAAN Sullins Connector Solutions 1 PC Mount Phono Jack- 971 Keystone J2 RCA Jack, Red, R/A, TH Red, TH J3 1 Header, 100mil, 14x2, Gold, TH 14x2 Header TSW-114-07-G-D Samtec 1 Receptacle, 2x1, 100mil, PPTC021LFBN-RC Sullins Connector Solutions J4 Receptacle, 100mil, 2x1, Tin, TH Tin 1 Sullins 100mil, 1x2, 230 PBC02SAAN Sullins Connector Solutions J6 Header, 100mil, 2x1, Gold, TH mil above insulator J7, J8, J9 3 Standard Banana Jack, Uninsulated, 5.5mm Keystone_575-4 575-4 Keystone R1, R2 2 590 RES, 590, 1%, 0.25 W, 1206 1206 RC1206FR-07590RL Yageo America R3, R13, R29, R41 4 0 RES, 0, 5%, 0.063 W, 0402 0402 RC0402JR-070RL Yageo America R5, R9, R12, R15, 14 1.00k 1206 RC1206FR-071KL Yageo America R18, R20, R23, RES, 1.00 k, 1%, 0.25 W, 1206 R26, R27, R32, R35, R40, R44, R52 R6, R14, R33, R43 4 100k RES, 100 k, 0.1%, 0.063 W, 0402 0402 RG1005P-104-B-T5 Susumu Co Ltd R7, R28, R31, R34 4 11.8k RES, 11.8 k, 1%, 0.25 W, 1206 1206 RC1206FR-0711K8L Yageo America R8 1 10.0k RES, 10.0 k, 1%, 0.25 W, 1206 1206 RC1206FR-0710KL Yageo America

Table 6. BOM (continued)

PACKAGE ALTERNATE PART ALTERNATE DESIGNATOR QTY VALUE DESCRIPTION PART NUMBER MANUFACTURER REFERENCE NUMBER MANUFACTURER R10, R11 2 1.30k RES, 1.30 k, 1%, 0.25 W, 1206 1206 RC1206FR-071K3L Yageo America 1 20K 17x24.5mm P160KN-0QC15B20K TT-Electronics-BI- R17 Potentiometer 20K 20% 16MM ROTARY POT, TH Technologies R19 1 422 RES, 422, 1%, 0.25 W, 1206 1206 RC1206FR-07422RL Yageo America R21 1 221 RES, 221, 1%, 0.25 W, 1206 1206 RC1206FR-07221RL Yageo America R22 1 475 RES, 475, 1%, 0.25 W, 1206 1206 RC1206FR-07475RL Yageo America R24 1 1k TRIMMER, 1k ohm, 0.5W, TH 375x190x375mil 3386P-1-102LF Bourns R25 1 332 RES, 332, 1%, 0.25 W, 1206 1206 RC1206FR-07332RL Yageo America R36, R38 2 845 RES, 845, 1%, 0.25 W, 1206 1206 RC1206FR-07845RL Yageo America R37, R39 2 1.40k RES, 1.40 k, 1%, 0.25 W, 1206 1206 RC1206FR-071K4L Yageo America R42 1 10k TRIMMER, 10k ohm, 0.5W, TH 375x190x375mil 3386P-1-103LF Bourns R46 1 88.7k RES, 88.7 k, 1%, 0.1 W, 0603 0603 RC0603FR-0788K7L Yageo America R47 1 12.0k RES, 12.0 k, 1%, 0.1 W, 0603 0603 RC0603FR-0712KL Yageo America R48 1 20.0k RES, 20.0 k, 1%, 0.1 W, 0603 0603 RC0603FR-0720KL Yageo America R49 1 220k RES, 220 k, 1%, 0.1 W, 0603 0603 RC0603FR-07220KL Yageo America R50 1 75.0k RES, 75.0 k, 1%, 0.1 W, 0603 0603 RC0603FR-0775KL Yageo America R51 1 10.0k RES, 10.0 k, 1%, 0.063 W, AEC-Q200 Grade 0, 0402 0402 RMCF0402FT10K0 Stackpole Electronics Inc SH-J1, SH-J2, SH- 5 1x2 Shunt 969102-0000-DA 3M SNT-100-BK-G Samtec Shunt, 100mil, Gold plated, Black J3, SH-J4, SH-J5 7 Sound Plus High-Performance, Bipolar-Input Audio DGK0008A OPA1602AIDGK Texas Instruments Equivalent Texas Instruments U1, U2, U3, U5, U6, Operational Amplifier, 4.5 to 36 V, -40 to 85 degC, 8-pin U7, U8 SOP (DGK0008A), Green (RoHS & no Sb/Br) U4, U9 2 Fully Differential I/O Audio Amplifier, DGN0008D (VSSOP-8) DGN0008D OPA1632DGNR Texas Instruments OPA1632DGN Texas Instruments 1 Vin 3V to 36V, 150mA, Ultra-Low Noise, High PSRR, Low- DRB0008A TPS7A4901DRBR Texas Instruments TPS7A4901DRBT Texas Instruments U10 Dropout Linear Regulator, DRB0008A (VSON-8) 1 Vin -3V to -36V, -200mA, Ultra-Low Noise, High PSRR, Low- DRB0008A TPS7A3001DRBR Texas Instruments TPS7A3001DRBT Texas Instruments U11 Dropout Linear Regulator, DRB0008A (VSON-8) 1 -5 V, Buck / Boost Charge Pump, 100 mA, 3.5 to 15 V Input, DW0016A LT1054CDW Texas Instruments Equivalent Texas Instruments U12 0 to 70 degC, 16-pin SOIC (DW16), Green (RoHS & no Sb/Br) C2, C8, C21, C27 0 180pF CAP, CERM, 180 pF, 50 V,+/- 5%, C0G/NP0, 0805 0805 C0805C181J5GACTU Kemet FID1, FID2, FID3 0 Fiducial mark. There is nothing to buy or mount. N/A N/A N/A R4, R16, R30, R45 0 7.50k RES, 7.50 k, 1%, 0.25 W, 1206 1206 RC1206FR-077K5L Yageo America 0 Orange Miniature 5003 Keystone TP1, TP2, TP3, TP4 Test Point, Miniature, Orange, TH Testpoint

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