LTC1400 Complete SO-8, 12-Bit, 400ksps ADC with U Shutdown FEATURES DESCRIPTIO ■ Complete 12-Bit ADC in SO-8 The LTC®1400 is a complete 400ksps, 12-bit A/D converter ■ Single Supply 5V or ±5V Operation which draws only 75mW from 5V or ±5V supplies. This ■ Sample Rate: 400ksps easy-to-use device comes complete with a 200ns sample- ■ Power Dissipation: 75mW (Typ) and-hold and a precision reference. Unipolar and bipolar ■ 72dB S/(N + D) and –80dB THD at Nyquist conversion modes add to the flexibility of the ADC. The ■ No Missing Codes over Temperature LTC1400 has two power saving modes: Nap and Sleep. ■ Nap Mode with Instant Wake-Up: 6mW In Nap mode, it consumes only 6mW of power and can ■ Sleep Mode: 30μW wake up and convert immediately. In the Sleep mode, it ■ High Impedance Analog Input consumes 30μW of power typically. Upon power-up from ■ Input Range (1mV/LSB): 0V to 4.096V or ±2.048V Sleep mode, a reference ready (REFRDY) signal is available ■ Internal Reference Can Be Overdriven Externally in the serial data word to indicate that the reference has ■ 3-Wire Interface to DSPs and Processors (SPI and settled and the chip is ready to convert. TM MICROWIRE Compatible) The LTC1400 converts 0V to 4.096V unipolar inputs from APPLICATIOUS a single 5V supply and ±2.048V bipolar inputs from ±5V supplies. Maximum DC specs include ±1LSB INL, ±1LSB ■ High Speed Data Acquisition DNL and 45ppm/°C drift over temperature. Guaranteed AC ■ Digital Signal Processing performance includes 70dB S/(N + D) and –76dB THD at ■ Multiplexed Data Acquisition Systems an input frequency of 100kHz, over temperature. ■ Audio and Telecom Processing The 3-wire serial port allows compact and efficient data ■ Digital Radio transfer to a wide range of microprocessors, microcon- ■ Spectrum Analysis trollers and DSPs. ■ Low Power and Battery-Operated Systems ■ Handheld or Portable Instruments , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATIO U Single 5V Supply, 400kHz, 12-Bit Sampling A/D Converter Power Consumption vs Sample Rate 100 5V NORMAL CONVERSION 10 VCC VSS NAP MODE + BETWEEN CONVERSION 10µF 0.1µF 1 LTC1400 MPU ANALOG INPUT SLEEP AND NAP MODE A (0V TO 4.096V) IN CONV P1.4 0.1 BETWEEN CONVERSION SLEEP MODE BETWEEN 2.42V REFOUT VREF CLK P1.3 + SUPPLY CURRENT (mA) CONVERSION 0.01 10µF 0.1µF GND DOUT P1.2 SERIAL 6.4MHz CLOCK DATA LINK 1400 TA01 0.001 0.01 0.1 1 10 100 1k 10k 100k 1M SAMPLE RATE (Hz) 1400 TA02 1400fa 1 LTC1400 WW U W W ABSOLUTE AXI U RATI GS PACKAGE/ORDER IUUFOR ATIO (Note 1, 2) TOP VIEW Supply Voltage (VCC) ..................................................7V V 1 8 V Negative Supply Voltage (VSS) ..................... –6V to GND CC SS A 2 7 CONV Total Supply Voltage (VCC to VSS) IN Bipolar Operation Only ..........................................12V VREF 3 6 CLK Analog Input Voltage (Note 3) GND 4 5 DOUT Unipolar Operation ....................–0.3V to (VCC + 0.3V) S8 PACKAGE Bipolar Operation ........... (V – 0.3V) to (V + 0.3V) 8-LEAD PLASTIC SO SS CC TJMAX = 150°C, θJA = 130°C/W Digital Input Voltage (Note 4) Unipolar Operation ................................. –0.3V to 12V ORDER PART NUMBER S8 PART MARKING Bipolar Operation .........................(VSS – 0.3V) to 12V LTC1400CS8 1400 Digital Output Voltage LTC1400IS8 1400I Unipolar Operation ....................–0.3V to (V + 0.3V) CC Order Options Tape and Reel: Add #TR Bipolar Operation ........... (VSS – 0.3V) to (VCC + 0.3V) Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Power Dissipation .............................................. 500mW Lead Free Part Marking: http://www.linear.com/leadfree/ Operation Temperature Range Consult LTC Marketing for parts specified with wider operating temperature ranges. LTC1400C ................................................ 0°C to 70°C LTC1400I ............................................. –40°C to 85°C Storage Temperature Range ................... –65°C to 150°C Lead Temperature (Soldering, 10 sec) .................. 300°C W U POW ER REQUIRE E TS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C unless otherwise noted. (Note 5) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VCC Positive Supply Voltage (Note 6) Unipolar 4.75 5.25 V Bipolar 4.75 5.25 V VSS Negative Supply Voltage (Note 6) Bipolar Only –2.45 –5.25 V ICC Positive Supply Current fSAMPLE = 400ksps ● 15 30 mA Nap Mode ● 1.0 3.0 mA Sleep Mode ● 5.0 20.0 μA ISS Negative Supply Current fSAMPLE = 400ksps, VSS = –5V ● 0.3 0.6 mA Nap Mode ● 0.2 0.5 mA Sleep Mode ● 1 5 μA PD Power Dissipation fSAMPLE = 400ksps ● 75 160 mW Nap Mode ● 6 20 mW Sleep Mode ● 30 125 μW U U A ALOG I PUT The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C unless otherwise noted. (Note 5) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VIN Analog Input Range (Note 7) 4.75V ≤ VCC ≤ 5.25V (Unipolar) ● 0 to 4.096 V 4.75V ≤ VCC ≤ 5.25V, –5.25V ≤ VSS ≤ –2.45V (Bipolar) ● ±2.048 V IIN Analog Input Leakage Current During Conversions (Hold Mode) ● ±1 μA CIN Analog Input Capacitance Between Conversions (Sample Mode) 45 pF During Conversions (Hold Mode) 5 pF 1400fa 2 LTC1400 U CO VERTER CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C unless otherwise noted. With internal reference (Notes 5, 8) PARAMETER CONDITIONS MIN TYP MAX UNITS Resolution (No Missing Codes) ● 12 Bits Integral Linearity Error (Note 9) ● ±1 LSB Differential Linearity Error ● ±1 LSB Offset Error (Note 10) ±6 LSB ● ±8 LSB Full-Scale Error ±15 LSB Full-Scale Tempco IOUT(REF) = 0 ● ±10 ±45 ppm/°C U W DY A IC ACCURACY The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, VSS = –5V, fSAMPLE = 400kHz unless otherwise noted. (Note 5) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS S/(N + D) Signal-to-Noise 100kHz Input Signal Commercial ● 70 72 dB Plus Distortion Ratio Industrial ● 69 dB 200kHz Input Signal 72 dB THD Total Harmonic Distortion 100kHz Input Signal ● –82 –76 dB Up to 5th Harmonic 200kHz Input Signal –80 dB Peak Harmonic or 100kHz Input Signal ● –84 –76 dB Spurious Noise 200kHz Input Signal –82 dB IMD Intermodulation Distortion fIN1 = 99.51kHz, fIN2 = 102.44kHz –82 dB fIN1 = 199.12kHz, fIN2 = 202.05kHz –70 dB Full Power Bandwidth 4 MHz Full Linear Bandwidth (S/(N + D) ≥ 68dB) 900 kHz UU U I TER AL REFERE CE CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C unless otherwise noted. (Note 5) PARAMETER CONDITIONS MIN TYP MAX UNITS VREF Output Voltage IOUT = 0 2.400 2.420 2.440 V VREF Output Tempco IOUT = 0 ● ±10 ±45 ppm/°C VREF Load Regulation 4.75V ≤ VCC ≤ 5.25V 0.01 LSB/V –5.25V ≤ VSS ≤ 0V 0.01 LSB/V VREF Load Regulation 0 ≤ |IOUT| ≤ 1mA 2 LSB/mA VREF Wake-Up Time from Sleep Mode (Note 7) CVREF = 10μF 4 ms U U D IGITAL I PUTS A D DIGITAL OUTPUTS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C unless otherwise noted. (Note 5) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VIH High Level Input Voltage VCC = 5.25V ● 2.0 V VIL Low Level Input Voltage VCC = 4.75V ● 0.8 V IIN Digital Input Current VIN = 0V to VCC ● ±10 μA CIN Digital Input Capacitance 5 pF VOH High Level Output Voltage VCC = 4.75V, IO = –10μA 4.7 V VCC = 4.75V, IO = –200μA ● 4.0 V 1400fa 3 LTC1400 U U D IGITAL I PUTS A D DIGITAL OUTPUTS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C unless otherwise noted. (Note 5) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VOL Low Level Output Voltage VCC = 4.75V, IO = 160μA 0.05 V VCC = 4.75V, IO = 1.6mA ● 0.10 0.4 V IOZ Hi-Z Output Leakage DOUT VOUT = 0V to VCC ● ±10 μA COZ Hi-Z Output Capacitance DOUT (Note 7) 15 pF ISOURCE Output Source Current VOUT = 0V –10 mA ISINK Output Sink Current VOUT = VCC 10 mA W U TI I G CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C unless otherwise noted. (Note 5) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS fSAMPLE(MAX) Maximum Sampling Frequency (Note 6) ● 400 kHz tCONV Conversion Time fCLK = 6.4MHz ● 2.1 μs tACQ Acquisition Time (Unipolar Mode) (Note 7) ● 230 300 ns (Bipolar Mode VSS = –5V) ● 200 270 ns fCLK CLK Frequency ● 0.1 6.4 MHz tCLK CLK Pulse Width (Notes 7, 12) ● 50 ns tWK(NAP) Time to Wake Up from Nap Mode (Note 7) 350 ns t1 CLK Pulse Width to Return to Active Mode ● 50 ns t2 CONV↑ to CLK↑ Setup Time ● 80 ns t3 CONV↑ After Leading CLK↑ ● 0 ns t4 CONV Pulse Width (Note 11) ● 50 ns t5 Time from CLK↑ to Sample Mode (Note 7) 80 ns t6 Aperture Delay of Sample-and-Hold Jitter < 50ps (Note 7) ● 45 65 ns t7 Minimum Delay Between Conversion (Unipolar Mode) ● 265 385 ns (Bipolar Mode VSS = –5V) ● 235 355 ns t8 Delay Time, CLK↑ to DOUT Valid CLOAD = 20pF ● 40 80 ns t9 Delay Time, CLK↑ to DOUT Hi-Z CLOAD = 20pF ● 40 80 ns t10 Time from Previous Data Remains Valid After CLK↑ CLOAD = 20pF ● 14 25 ns t11 Minimum Time between Nap/Sleep Request to Wake Up Request (Notes 7, 12) ● 50 ns Note 1: Stresses beyond those listed under Absolute Maximum Ratings Note 7: Guaranteed by design, not subject to test.