LTC5585 Wideband IQ Demodulator with IIP2 and DC Offset Control FEATURES DESCRIPTION n 700MHz to 3GHz Operating Frequency The LTC®5585 is a direct conversion quadrature demodu- n High IIP3: 28.7dBm at 700MHz, 25.7dBm at 1.95GHz lator optimized for high linearity receiver applications in n High IIP2: 70dBm at 700MHz, 60dBm at 1.95GHz the 700MHz to 3GHz frequency range. It is also usable in n User Adjustable IIP2 Up to 80dBm the 400MHz to 700MHz and 3GHz to 4GHz ranges with n User Adjustable DC Offset Null reduced performance. It is suitable for communications n High Input P1dB: 16dBm at 1950MHz receivers where an RF signal is directly converted into I n I/Q Bandwidth of 530MHz or Higher and Q baseband signals with bandwidth of 530MHz or n Image Rejection: 43dB at 1950MHz higher. The LTC5585 incorporates balanced I and Q mix- n Noise Figure: 13.5dB at 700MHz ers, LO buffer amplifiers and a precision, high frequency 12.7dB at 1.95GHz quadrature phase shifter. The integrated on-chip broadband n Conversion Gain: 2.0dB at 700MHz transformer provides a single-ended interface at the RF 2.4dB at 1.95GHz input with simple off-chip L-C matching. In addition, the n Single-Ended RF with On-Chip Transformer LTC5585 provides four analog control voltage interface n Shutdown Mode pins for IIP2 and DC offset correction, greatly simplifying n Operating Temperature Range (TC): –40°C to 105°C system calibration. n 24-Lead 4mm × 4mm QFN Package The high linearity of the LTC5585 provides excellent spur- APPLICATIONS free dynamic range for the receiver. This direct conversion demodulator can eliminate the need for intermediate fre- n LTE/W-CDMA/TD-SCDMA Base Station Receivers quency (IF) signal processing, as well as the corresponding n Wideband DPD Receivers requirements for image filtering and IF filtering. These n Point-To-Point Broadband Radios I/Q outputs can interface directly to channel-select filters n High Linearity Direct Conversion I/Q Receivers (LPFs) or to baseband amplifiers. n Image Rejection Receivers L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION Direct Conversion Receiver with IIP2 and DC Offset Calibration 5V BPF LNA BPF RF V CC + LPF VGA INPUT RF I IIP2 vs IP2I, IP2Q Trim Voltage I– A/D 120 I, –40°C Q, –40°C fRF = 700MHz I, 25°C Q, 25°C 110 I, 85°C Q, 85°C D/A IP2 ADJUST I, 105°C Q, 105°C IP2 AND DC 100 OFFSET CAL DC OFFSET 90 D/A LO 0° 80 LO INPUT LTC5585 90° IIP2 (dBm) 70 D/A DC OFFSET IP2 AND DC 60 OFFSET CAL IP2 ADJUST 50 D/A 40 LPF VGA 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Q+ ENABLE EN IP2I, IP2Q (V) – A/D Q 5585 G09 5585 TA01a 5585f 1 LTC5585 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW VCC Supply Voltage ................................... –0.3V to 5.5V + – + – VCAP Voltage .................................................VCC ±0.05V REF I I Q Q CMI – + + – 24 23 22 21 20 19 I , I , Q , Q , CMI, CMQ Voltage ........2.5V to VCC + 0.3V IP2Q 1 18 CMQ Voltage on Any Other Pin .................–0.3V to VCC + 0.3V + – DCOQ 2 17 VCAP LO , LO , RF Input Power ....................................20dBm – DCOI 3 25 16 LO RF Input DC Voltage ............................................... ±0.1V IP2I 4 GND 15 LO+ Maximum Junction Temperature (TJMAX) ............. 150°C RF 5 14 GND Operating Temperature Range (TC) ........ –40°C to 105°C GND 6 13 GND Storage Temperature Range .................. –65°C to 150°C 7 8 9 10 11 12 CC EN V EDC BIAS GND EIP2 V UF PACKAGE 24-LEAD (4mm × 4mm) PLASTIC QFN TJMAX = 150°C, θJC = 7°C/W EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC5585IUF#PBF LTC5585IUF#TRPBF 5585 24-Lead (4mm x 4mm) Plastic QFN –40°C to 105°C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ ELECTRICAL CHARACTERISTICS TC = 25°C, VCC = 5V, EN = 5V, EDC = EIP2 = 0V, REF = IP2I = IP2Q = DCOI = DCOQ = 0.5V, PRF = –5dBm (–5dBm/tone for 2-tone IIP2 and IIP3 tests), PLO = 6dBm, unless otherwise noted. (Notes 2, 3, 5, 6, 9) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS fRF(RANGE) RF Input Frequency Range (Note 12) 0.4 to 4.0 GHz fLO(RANGE) LO Input Frequency Range (Note 12) 0.4 to 4.0 GHz PLO(RANGE) LO Input Power Range (Note 12) 0 to 10 dBm fRF1 = 700MHz, fRF2 = 701MHz, fLO = 690MHz, L6 = 2.7pF, C19 = 1.0pF, L5 = 12nH, C14 = 5.6pF fRF(MATCH) RF Input Frequency Range Return Loss > 10dB 680 to 870 MHz fLO(MATCH) LO Input Frequency Range Return Loss > 10dB 690 to 820 MHz GV Voltage Conversion Gain Loaded with 100Ω Pull-Up (Note 8) 2.0 dB NF Noise Figure Double-Side Band (Note 4) 13.5 dB NFBLOCKING Noise Figure Under Blocking Conditions Double-Side Band, PRF = 0dBm (Note 7) 15.5 dB IIP3 Input 3rd Order Intercept 28.7 dBm IIP2 Input 2nd Order Intercept Unadjusted, EIP2 = 0V 70 dBm IIP2OPT Optimized Input 2nd Order Intercept EIP2 = 5V, IP2I, IP2Q Adjusted for Minimum IM2 80 dBm P1dB Input 1dB Compression 16 dBm DCOFFSET DC Offset at I/Q Outputs Unadjusted, EDC = 0V (Note 13) 4 mV ∆G I/Q Gain Mismatch 0.05 dB ∆φ I/Q Phase Mismatch 0.3 Deg 5585f 2 LTC5585 ELECTRICAL CHARACTERISTICS TC = 25°C, VCC = 5V, EN = 5V, EDC = EIP2 = 0V, REF = IP2I = IP2Q = DCOI = DCOQ = 0.5V, PRF = –5dBm (–5dBm/tone for 2-tone IIP2 and IIP3 tests), PLO = 6dBm, unless otherwise noted. (Notes 2, 3, 5, 6, 9) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS IRR Image Rejection Ratio (Note 10) 45 dB LO-RF LO to RF Leakage –64 dBm RF-LO RF to LO Isolation 60 dB fRF1 = 1950MHz, fRF2 = 1951MHz, fLO = 1940MHz, L6 = 4.7nH, C19 = 0.5pF, L5 = 0.8pF, C13 = 5.1nH fRF(MATCH) RF Input Frequency Range Return Loss > 10dB 1.6 to 2.1 GHz fLO(MATCH) LO Input Frequency Range Return Loss > 10dB 1.85 to 2.05 GHz GV Voltage Conversion Gain Loaded with 100Ω Pull-Up (Note 8) 2.4 dB NF Noise Figure Double-Side Band (Note 4) 12.7 dB IIP3 Input 3rd Order Intercept 25.7 dBm IIP2 Input 2nd Order Intercept Unadjusted, EIP2 = 0V 60 dBm IIP2OPT Optimized Input 2nd Order Intercept EIP2 = 5V, IP2I, IP2Q Adjusted for Minimum IM2 80 dBm P1dB Input 1dB Compression 16 dBm DCOFFSET DC Offset at I/Q Outputs Unadjusted, EDC = 0V (Note 13) 7 mV ∆G I/Q Gain Mismatch 0.05 dB ∆φ I/Q Phase Mismatch 0.7 Deg IRR Image Rejection Ratio (Note 10) 43 dB LO-RF LO to RF Leakage –49 dBm RF-LO RF to LO Isolation 58 dB fRF1 = 2150MHz, fRF2 = 2151MHz, fLO = 2140MHz, C17 = 1.5pF, L6 = 4.7nH, C19 = 0.5pF, L5 = 5.1nH, C14 = 0.7pF fRF(MATCH) RF Input Frequency Range Return Loss > 10dB 2.03 to 2.36 GHz fLO(MATCH) LO Input Frequency Range Return Loss > 10dB 2.05 to 2.18 GHz GV Voltage Conversion Gain Loaded with 100Ω Pull-Up (Note 8) 2.3 dB NF Noise Figure Double-Side Band (Note 4) 13.0 dB NFBLOCKING Noise Figure Under Blocking Conditions Double-Side Band, PRF = 0dBm (Note 7) 14.6 dB IIP3 Input 3rd Order Intercept 25.9 dBm IIP2 Input 2nd Order Intercept Unadjusted, EIP2 = 0V 56 dBm IIP2OPT Optimized Input 2nd Order Intercept EIP2 = 5V, IP2I, IP2Q Adjusted for Minimum IM2 80 dBm P1dB Input 1dB Compression 15 dBm DCOFFSET DC Offset at I/Q Outputs Unadjusted, EDC = 0V (Note 13) 6 mV ∆G I/Q Gain Mismatch 0.05 dB ∆φ I/Q Phase Mismatch 1.0 Deg IRR Image Rejection Ratio (Note 10) 40 dB LO-RF LO to RF Leakage –50 dBm RF-LO RF to LO Isolation 60 dB fRF1 = 2600MHz, fRF2 = 2601MHz, fLO = 2590MHz, C17 = 0.5pF, L6 = 2.7nH, L5 = 1.2nH, C14 = 1pF fRF(MATCH) RF Input Frequency Range Return Loss > 10dB 2.35 to 3.1 GHz fLO(MATCH) LO Input Frequency Range Return Loss > 10dB 2.47 to 2.65 GHz GV Voltage Conversion Gain Loaded with 100Ω Pull-Up (Note 8) 2.3 dB NF Noise Figure Double-Side Band (Note 4) 13.6 dB NFBLOCKING Noise Figure Under Blocking Conditions Double-Side Band, PRF = 0dBm (Note 7) 15.2 dB IIP3 Input 3rd Order Intercept 27.5 dBm IIP2 Input 2nd Order Intercept Unadjusted, EIP2 = 0V 60 dBm IIP2OPT Minimum Input 2nd Order Intercept EIP2 = 5V, IP2I, IP2Q Adjusted for Minimum IM2 80 dBm P1dB Input 1dB Compression 15.5 dBm DCOFFSET DC Offset at I/Q Outputs Unadjusted, EDC = 0V (Note 13) 8 mV 5585f 3 LTC5585 ELECTRICAL CHARACTERISTICS TC = 25°C, VCC = 5V, EN = 5V, EDC = EIP2 = 0V, REF = IP2I = IP2Q = DCOI = DCOQ = 0.5V, PRF = –5dBm (–5dBm/tone for 2-tone IIP2 and IIP3 tests), PLO = 6dBm, unless otherwise noted.