LTC5592 Dual 1.6GHz to 2.7GHz High Dynamic Range Downconverting Mixer DESCRIPTION FEATURES n n n n n n n n n n n n n n Conversion Gain: 8.3dB at 2.35GHz IIP3: 27.3dBm at 2.35GHz Noise Figure: 9.8dB at 2.35GHz 15.3dB NF Under 5dBm Blocking High Input P1dB 47dB Channel-to-Channel Isolation 3.3V Supply, 1.3W Power Consumption Low Power Mode for 0.8W Consumption Independent Channel Shutdown Control 50Ω Single-Ended RF and LO Inputs LO Input Matched In All Modes 0dBm LO Drive Level Small Package and Solution Size –40°C to 105°C Operation The LTC®5592 is part of a family of dual-channel high dynamic range, high gain downconverting mixers covering the 600MHz to 4.5GHz RF frequency range. The LTC5592 is optimized for 1.6GHz to 2.7GHz RF applications. The LO frequency must fall within the 1.7GHz to 2.5GHz range for optimum performance. A typical application is a LTE or WiMAX receiver with a 2.3GHz to 2.7GHz RF input and low side LO. The LTC5592’s high conversion gain and high dynamic range enable the use of lossy IF filters in high selectivity receiver designs, while minimizing the total solution cost, board space and system-level variation. A low current mode is provided for additional power savings and each of the mixer channels has independent shutdown control. APPLICATIONS n n n High Dynamic Range Dual Downconverting Mixer Family 3G/4G Wireless Infrastructure Diversity Receivers (LTE, W-CDMA, TD-SCDMA, WiMAX, GSM 1800) MIMO Infrastructure Diversity Receivers High Dynamic Range Downmixer Applications PART NUMBER RF RANGE LO RANGE LTC5590 600MHz to 1.7GHz 700MHz to 1.5GHz LTC5591 1.3GHz to 2.3GHz 1.4GHz to 2.1GHz LTC5592 1.6GHz to 2.7GHz 1.7GHz to 2.5GHz LTC5593 2.3GHz to 4.5GHz 2.1GHz to 4.2GHz 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 Wideband Conversion Gain and IIP3 vs IF Frequency Wideband LTE Receiver 190MHz SAW VCCIF 3.3V or 5V 1μF 22pF 150nH RF 2300MHz TO 2400MHz 22pF VCCA IFA– BIAS LO AMP 2.2pF IF AMP IFB+ 150nH 26 10 25 9 24 23 170 180 200 190 IF FREQUENCY (MHz) 22 210 21 220 5592 TA01b VCCB LTC5592 ONLY, MEASURED ON EVALUATION BOARD VCC 22pF 150nH 1nF GC LO = 2160MHz PLO = 0dBm RF = 2350 ±30MHz TEST CIRCUIT IN FIGURE 1 6 160 ENB (0V/3.3V) BIAS IFB– 1nF 190MHz SAW 22pF 27 11 8 SYNTH ENB VCCIF LO 2160MHz LO LO AMP RFB LNA 1μF 12 7 IMAGE BPF 22pF 28 IIP3 VCC 3.3V ENA (0V/3.3V) ENA RFA LNA 29 13 IF AMP IMAGE BPF 22pF 14 ADC IIP3 (dBm) RF 2300MHz TO 2400MHz IF AMP 1nF 150nH IFA+ 190MHz BPF GC (dB) 1nF 190MHz BPF IF AMP ADC 5592 TA01a 5592f 1 LTC5592 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) Supply Voltage (VCC) ...............................................4.0V IF Supply Voltage (VCCIF) .........................................5.5V Enable Voltage (ENA, ENB) ..............–0.3V to VCC + 0.3V Bias Adjust Voltage (IFBA, IFBB) ......–0.3V to VCC + 0.3V Power Select Voltage (ISEL) .............–0.3V to VCC + 0.3V LO Input Power (1GHz to 3GHz) .............................9dBm LO Input DC Voltage............................................... ±0.1V RFA, RFB Input Power (1GHz to 3GHz) ................15dBm RFA, RFB Input DC Voltage .................................... ±0.1V Operating Temperature Range (TC) ........ –40°C to 105°C Storage Temperature Range .................. –65°C to 150°C Junction Temperature (TJ) .................................... 150°C VCCA IFBA IFA– IFA+ IFGNDA GND TOP VIEW 24 23 22 21 20 19 RFA 1 18 ISEL CTA 2 17 ENA GND 3 16 LO 25 GND GND 4 15 GND 13 GND VCCB IFBB 9 10 11 12 IFB– 8 IFB+ 7 GND 14 ENB RFB 6 IFGNDB CTB 5 UH PACKAGE 24-LEAD (5mm w 5mm) 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 LTC5592IUH#PBF LTC5592IUH#TRPBF 5592 24-Lead (5mm × 5mm) 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/ DC ELECTRICAL CHARACTERISTICS unless otherwise noted. Test circuit shown in Figure 1. (Note 2) PARAMETER VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25°C, CONDITIONS MIN TYP MAX UNITS VCCA, VCCB Supply Voltage (Pins 12, 19) 3.1 3.3 3.5 V VCCIFA, VCCIFB Supply Voltage (Pins 9, 10, 21, 22) 3.1 3.3 5.3 V Power Supply Requirements (VCCA, VCCB, VCCIFA, VCCIFB) Mixer Supply Current (Pins 12, 19) Both Channels Enabled 199 237 mA IF Amplifier Supply Current (Pins 9, 10, 21, 22) Both Channels Enabled 202 252 mA Total Supply Current (Pins 9, 10, 12, 19, 21, 22) Both Channels Enabled 401 489 mA Total Supply Current – Shutdown ENA = ENB = Low 500 μA Enable Logic Input (ENA, ENB) High = On, Low = Off ENA, ENB Input High Voltage (On) 2.5 V ENA, ENB Input Low Voltage (Off) ENA, ENB Input Current –0.3V to VCC + 0.3V –20 0.3 V 30 μA Turn On Time 0.9 μs Turn Off Time 1 μs 5592f 2 LTC5592 DC ELECTRICAL CHARACTERISTICS unless otherwise noted. Test circuit shown in Figure 1. (Note 2) PARAMETER VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25°C, CONDITIONS MIN TYP MAX UNITS Low Power Mode Logic Input (ISEL) High = Low Power, Low = Normal Power Mode ISEL Input High Voltage 2.5 V ISEL Input Low Voltage ISEL Input Current –0.3V to VCC + 0.3V –20 0.3 V 30 μA 156 mA Low Power Mode Current Consumption (ISEL = High) Mixer Supply Current (Pins 12, 19) Both Channels Enabled 130 IF Amplifier Supply Current (Pins 9, 10, 21, 22) Both Channels Enabled 122 156 mA Total Supply Current (Pins 9, 10, 12, 19, 21, 22) Both Channels Enabled 252 312 mA AC ELECTRICAL CHARACTERISTICS VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25°C, PLO = 0dBm, PRF = –3dBm (Δf = 2MHz for two tone IIP3 tests), unless otherwise noted. Test circuit shown in Figure 1. (Notes 2, 3, 4) PARAMETER CONDITIONS MIN LO Input Frequency Range RF Input Frequency Range Low Side LO High Side LO TYP MAX UNITS 1700 to 2500 MHz 1900 to 2700 1600 to 2300 MHz MHz 5 to 500 MHz IF Output Frequency Range Requires External Matching RF Input Return Loss ZO = 50Ω, 1600MHz to 2700MHz >13 dB LO Input Return Loss ZO = 50Ω, 1700MHz to 2500MHz >17 dB IF Output Impedance Differential at 190MHz 379Ω||2.2pF R||C LO Input Power fLO = 1700MHz to 2500MHz LO to RF Leakage fLO = 1700MHz to 2500MHz <–34 dBm LO to IF Leakage fLO = 1700MHz to 2500MHz <–37 dBm RF to LO Isolation fRF = 1600MHz to 2700MHz >57 dB RF to IF Isolation fRF = 1600MHz to 2700MHz >37 dB Channel-to-Channel Isolation fRF = 1600MHz to 2700MHz >47 dB –4 0 6 dBm Low Side LO Downmixer Application: ISEL = Low, RF = 1900MHz to 2700MHz, IF = 190MHz, fLO = fRF – fIF PARAMETER CONDITIONS MIN TYP Conversion Gain RF = 1950MHz RF = 2350MHz RF = 2550MHz 6.8 9.5 8.3 8.1 dB dB dB RF = 2350 ±30MHz, LO = 2160MHz, IF = 190 ±30MHz ±0.14 dB Conversion Gain vs Temperature TC = –40ºC to 105ºC, RF = 2350MHz –0.006 dB/°C Input 3rd Order Intercept RF = 1950MHz RF = 2350MHz RF = 2550MHz 26.3 27.3 26.3 dBm dBm dBm 9.4 9.8 9.9 dB dB dB Conversion Gain Flatness SSB Noise Figure RF = 1950MHz RF = 2350MHz RF = 2550MHz 24.0 MAX UNITS 5592f 3 LTC5592 AC ELECTRICAL CHARACTERISTICS VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, TC = 25°C, PLO = 0dBm, PRF = –3dBm (Δf = 2MHz for two tone IIP3 tests), unless otherwise noted. Test circuit shown in Figure 1. (Notes 2, 3) Low Side LO Downmixer Application: ISEL = Low, RF = 1900MHz to 2700MHz, IF = 190MHz, fLO = fRF – fIF PARAMETER CONDITIONS MIN SSB Noise Figure Under Blocking fRF = 2400MHz, fLO = 2210MHz, fBLOCK = 2500MHz PBLOCK = 5dBm PBLOCK = 10dBm TYP MAX UNITS 15.3 21.2 dB dB 2RF-2LO Output Spurious Product (fRF = fLO + fIF/2) fRF = 2255MHz at –10dBm, fLO = 2160MHz, fIF = 190MHz –68 dBc 3RF-3LO Output Spurious Product (fRF = fLO + fIF/3) fRF = 2223.33MHz at –10dBm, fLO = 2160MHz, fIF = 190MHz –74 dBc Input 1dB Compression fRF = 2350MHz, VCCIF = 3.3V fRF = 2350MHz, VCCIF = 5V 11 14.6 dBm dBm Low Power Mode, Low Side LO Downmixer Application: ISEL = High, RF = 1900MHz to 2700MHz, IF = 190MHz, fLO = fRF – fIF PARAMETER CONDITIONS Conversion Gain RF = 2350MHz MIN TYP MAX UNITS 7.1 dB Input 3rd Order Intercept RF = 2350MHz 22.3 dBm SSB Noise Figure RF = 2350MHz 10.2 dB Input 1dB Compression RF = 2350MHz, VCCIF = 3.3V RF = 2350MHz, VCCIF = 5V 11.3 12.6 dBm dBm High Side LO Downmixer Application: ISEL = Low, RF = 1600MHz to 2300MHz, IF = 190MHz, fLO = fRF + fIF PARAMETER CONDITIONS Conversion Gain RF = 1750MHz RF = 1950MHz RF = 2150MHz Conversion Gain Flatness MIN TYP MAX UNITS 9.1 8.7 8.3 dB dB dB RF = 1950 ±30MHz, LO = 2140MHz, IF = 190 ±30MHz ±0.33 dB Conversion Gain vs Temperature TC = –40ºC to 105ºC, RF = 1900MHz –0.005 dB/°C Input 3rd Order Intercept RF = 1750MHz RF = 1950MHz RF = 2150MHz 25.3 25.4 25.1 dBm dBm dBm SSB Noise Figure RF = 1750MHz RF = 1950MHz RF = 2150MHz 9.2 9.8 10.4 dB dB dB SSB Noise Figure Under Blocking fRF = 1950MHz, fLO = 2140MHz, fBLOCK = 1850MHz PBLOCK = 5dBm PBLOCK = 10dBm 16.5 22.7 dB dB 2LO-2RF Output Spurious Product (fRF = fLO – fIF/2) fRF = 2045MHz at –10dBm, fLO = 2140MHz, fIF = 190MHz –68 dBc 3LO-3RF Output Spurious Product (fRF = fLO – fIF/3) fRF = 2076.67MHz at –10dBm, fLO = 2140MHz, fIF = 190MHz –75 dBc Input 1dB Compression RF = 1950MHz, VCCIF = 3.3V RF = 1950MHz, VCCIF = 5V 10.6 14.0 dBm dBm Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTC5592 is guaranteed functional over the case operating temperature range of –40°C to 105°C (θJC = 7°C/W). Note 3: SSB Noise Figure measured with a small-signal noise source, bandpass filter and 6dB matching pad on RF input, bandpass filter and 6dB matching pad on the LO input, and no other RF signals applied. Note 4: Channel A to channel B isolation is measured as the relative IF output power of channel B to channel A, with the RF input signal applied to channel A. The RF input of channel B is 50Ω terminated and both mixers are enabled. 5592f 4 LTC5592 TYPICAL AC PERFORMANCE CHARACTERISTICS Low Side LO VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25°C, PLO = 0dBm, PRF = –3dBm (–3dBm/tone for two-tone IIP3 tests, Δf = 2MHz), IF = 190MHz, unless otherwise noted. Test circuit shown in Figure 1. Conversion Gain and IIP3 vs RF Frequency SSB NF vs RF Frequency 28 17 16 26 16 15 15 14 IIP3 14 16 13 12 11 SSB NF (dB) –40°C 25°C 85°C 105°C 20 18 12 11 10 14 10 12 9 9 10 8 8 7 7 GC 8 40 –40°C 25°C 85°C 35 1900 1950MHz Conversion Gain, IIP3 and NF vs LO Power 2550MHz Conversion Gain, IIP3 and NF vs LO Power 2350MHz Conversion Gain, IIP3 and NF vs LO Power 22 28 26 20 26 18 24 18 24 16 22 16 22 18 12 16 10 14 8 NF 12 6 GC 10 6 –6 –4 4 –2 2 0 LO INPUT POWER (dBm) 14 18 12 16 10 14 8 NF 6 12 10 4 8 20 GC 0 0 –6 6 –4 4 –2 2 0 LO INPUT POWER (dBm) 12 10 14 Conversion Gain, IIP3 and NF vs Supply Voltage (Single Supply) 6 24 30 28 22 28 18 26 20 26 16 24 18 12 16 10 14 8 NF 6 12 10 22 20 12 16 10 14 8 10 2 8 6 0 3.6 6 3.5 3.2 3.1 3.4 3.3 VCC, VCCIF SUPPLY VOLTAGE (V) 5592 G07 NF 12 4 3 16 14 18 8 GC 18 –40°C 25°C 85°C GC 3 6 RF = 2350MHz 4 VCC = 3.3V 2 4 3.5 5 4.5 VCCIF SUPPLY VOLTAGE (V) 0 5.5 5592 G08 SSB NF (dB) 14 SSB NF (dB) RF = 2350MHz VCC = VCCIF 20 IIP3 GC (dB), IIP3 (dBm), P1dB (dBm) 30 20 GC (dB), IIP3 (dBm) 22 –40°C 25°C 85°C –4 0 4 –2 2 0 LO INPUT POWER (dBm) 6 Conversion Gain, IIP3 and RF Input P1dB vs Temperature 26 22 2 5592 G06 Conversion Gain, IIP3 and NF vs Supply Voltage (Dual Supply) IIP3 4 GC –6 28 24 6 5592 G05 5592 G04 8 NF 12 6 6 16 14 16 8 8 18 –40°C 25°C 85°C 18 10 2 20 IIP3 20 4 2 22 SSB NF (dB) 14 –40°C 25°C 85°C SSB NF (dB) 20 SSB NF (dB) –40°C 25°C 85°C 22 IIP3 GC (dB), IIP3 (dBm) 28 20 GC (dB), IIP3 (dBm) 22 26 IIP3 2700 5592 G03 28 24 2500 2100 2300 RF FREQUENCY (MHz) 5592 G02 5592 G01 GC (dB), IIP3 (dBm) 45 6 1900 2000 2100 2200 2300 2400 2500 2600 2700 RF FREQUENCY (MHz) 6 6 1900 2000 2100 2200 2300 2400 2500 2600 2700 RF FREQUENCY (MHz) GC (dB), IIP3 (dBm) 50 13 GC (dB) IIP3 (dBm) 22 –40°C 25°C 85°C 105°C ISOLATION (dB) 24 Channel Isolation vs RF Frequency 55 24 22 IIP3 VCCIF = 3.3V VCCIF = 5V RF = 2350MHz 20 18 16 14 12 P1dB 10 8 6 –40 GC 20 –10 80 50 CASE TEMPERATURE (°C) 110 5592 G09 5592f 5 LTC5592 TYPICAL AC PERFORMANCE CHARACTERISTICS Low Side LO VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25°C, PLO = 0dBm, PRF = –3dBm (–3dBm/tone for two-tone IIP3 tests, Δf = 2MHz), IF = 190MHz, unless otherwise noted. Test circuit shown in Figure 1. Single-Tone IF Output Power, 2 × 2 and 3 × 3 Spurs vs RF Input Power 20 20 10 10 –55 –10 –20 RF1 = 2349MHz RF2 = 2351MHz LO = 2160MHz –30 –40 –50 IM3 –60 –10 –20 –30 –40 LO = 2160MHz 3RF-3LO (RF = 2223.33MHz) –50 –60 IM5 –70 –6 –9 3 –3 0 RF INPUT POWER (dBm/TONE) –80 –12 6 –6 0 –3 RF INPUT POWER (dBm) PLO = –3dBm PLO = 0dBm PLO = 3dBm PLO = 6dBm –6 6 –3 3 0 LO INPUT POWER (dBm) 5592 G12 RF Isolation vs RF Frequency 70 RF-LO –10 RF = 2400MHz BLOCKER = 2500MHz 14 50 ISOLATION (dB) LO LEAKAGE (dBm) SSB NF (dB) 3RF-3LO (RF = 2223.33MHz) 60 12 –20 –30 LO-RF 40 RF-IF 30 20 –40 LO-IF 10 8 –20 –15 5 –10 –5 0 RF BLOCKER POWER (dBm) RF = 2350MHz 10 85°C 25°C –40°C 40 25 20 15 10 5 8 8.5 9 GAIN (dB) 5592 G16 2700 RF = 2350MHz 35 30 25 20 15 10 5 0 24.5 85°C 25°C –40°C 45 DISTRIBUTION (%) DISTRIBUTION (%) 30 15 1900 2100 2300 2500 RF FREQUENCY (MHz) SSB Noise Figure Distribution 50 35 85°C 25°C –40°C 1700 5592 G15 IIP3 Distribution 40 RF = 2350MHz 0 7.5 0 1500 5592 G14 Conversion Gain Distribution 20 10 –50 1700 1800 1900 2000 2100 2200 2300 2400 2500 LO FREQUENCY (MHz) 10 5592 G13 DISTRIBUTION (%) –75 6 3 0 16 25 2RF-2LO (RF = 2255MHz) –70 LO Leakage vs LO Frequency 24 18 –65 5592 G11 SSB Noise Figure vs RF Blocker Power 20 –60 –85 –9 5592 G10 22 IF = 190MHz PRF = –10dBm LO = 2160MHz –80 2RF-2LO (RF = 2255MHz) –70 –80 –12 RELATIVE SPUR LEVEL (dBc) IFOUT 2 × 2 and 3 × 3 Spur Suppression vs LO Input Power IFOUT (RF = 2350MHz) 0 0 OUTPUT POWER (dBm) OUTPUT POWER (dBm/TONE) 2-Tone IF Output Power, IM3 and IM5 vs RF Input Power 5 0 25.5 26.5 IIP3 (dBm) 27.5 28.5 5592 G17 7 8 9 10 NOISE FIGURE (dB) 11 12 5592 G18 5592f 6 LTC5592 TYPICAL AC PERFORMANCE CHARACTERISTICS Low Power Mode, Low Side LO VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = High, TC = 25°C, PLO = 0dBm, PRF = –3dBm (–3dBm/tone for two-tone IIP3 tests, Δf = 2MHz), IF = 190MHz, unless otherwise noted. Test circuit shown in Figure 1. Conversion Gain and IIP3 vs RF Frequency 15 16 23 14 15 21 13 14 –40°C 25°C 85°C 105°C 13 10 9 12 11 10 11 8 9 9 7 8 6 7 7 GC 6 1900 2000 2100 2200 2300 2400 2500 2600 2700 RF FREQUENCY (MHz) 5 5 1900 2000 2100 2200 2300 2400 2500 2600 2700 RF FREQUENCY (MHz) 1950MHz Conversion Gain, IIP3 and NF vs LO Power 20 19 8 NF 11 6 4 9 GC –4 4 –2 2 0 LO INPUT POWER (dBm) IIP3 NF 17 9 0 5 6 GC –6 –4 4 –2 2 0 LO INPUT POWER (dBm) 16 21 16 14 19 14 NF 17 10 8 13 9 2 7 0 5 GC 25 18 23 21 16 21 16 14 19 8 9 GC –40°C 6 25°C 85°C 4 14 NF 12 15 10 13 8 VCC = 3.3V RF = 2350MHz 11 9 GC –40°C 25°C 85°C 6 4 7 2 7 2 5 0 3.6 5 0 5.5 3 3.5 3.2 3.1 3.4 3.3 VCC, VCCIF SUPPLY VOLTAGE (V) 5592 G25 3 5 4 3.5 4.5 VCCIF SUPPLY VOLTAGE (V) 5592 G26 SSB NF (dB) 10 SSB NF (dB) 15 13 GC (dB), IIP3 (dBm) 20 23 VCC = VCCIF RF = 2350MHz 4 –2 2 0 LO INPUT POWER (dBm) 6 Conversion Gain, IIP3 and RF Input P1dB vs Temperature 25 11 –4 5592 G24 18 17 4 0 –6 20 12 6 2 23 NF –40°C 25°C 85°C 11 6 IIP3 12 15 Conversion Gain, IIP3 and NF vs Supply Voltage (Dual Supply) IIP3 18 IIP3 25 17 6 20 5592 G23 Conversion Gain, IIP3 and NF vs Supply Voltage (Single Supply) GC (dB), IIP3 (dBm) 18 23 8 –40°C 25°C 6 85°C 4 13 7 25 10 11 2 20 12 15 5592 G22 19 3 –6 –9 0 –3 RF INPUT POWER (dBm/TONE) 2550MHz Conversion Gain, IIP3 and NF vs LO Power GC (dB), IIP3 (dBm), P1dB (dBm) GC (dB), IIP3 (dBm) 10 15 GC (dB), IIP3 (dBm) 21 –40°C 14 25°C 85°C 12 –6 IM5 SSB NF (dB) 16 19 5 –60 –80 –12 SSB NF (dB) 21 SSB NF (dB) 23 7 IM3 5592 G21 25 18 23 13 –40 2350MHz Conversion Gain, IIP3 and NF vs LO Power IIP3 17 RF1 = 2349MHz RF2 = 2351MHz LO = 2160MHz –20 5592 G20 5592 G19 25 0 GC (dB), IIP3 (dBm) 15 SSB NF (dB) 11 17 IFOUT 13 GC (dB) IIP3 (dBm) 12 IIP3 20 –40°C 25°C 85°C 105°C OUTPUT POWER (dBm/TONE) 25 19 2-Tone IF Output Power, IM3 and IM5 vs RF Input Power SSB NF vs RF Frequency 21 19 IIP3 VCCIF = 3.3V VCCIF = 5V 17 15 P1dB 13 11 RF = 2350MHz 9 7 5 –40 GC 80 20 –10 50 CASE TEMPERATURE (°C) 110 5592 G27 5592f 7 LTC5592 TYPICAL AC PERFORMANCE CHARACTERISTICS High Side LO VCC = 3.3V, VCCIF = 3.3V, ENA = ENB = High, ISEL = Low, TC = 25°C, PLO = 0dBm, PRF = –3dBm (–3dBm/tone for two-tone IIP3 tests, Δf = 2MHz), IF = 190MHz, unless otherwise noted. Test circuit shown in Figure 1. Conversion Gain and IIP3 vs RF Frequency SSB NF vs RF Frequency 28 17 16 26 16 15 15 IIP3 18 16 12 11 14 10 GC 11 10 9 10 8 8 8 7 7 50 40 35 1600 1700 1800 1900 2000 2100 2200 2300 RF FREQUENCY (MHz) 5592 G30 5592 G29 5592 G28 1750MHz Conversion Gain, IIP3 and NF vs LO Power 1950MHz Conversion Gain, IIP3 and NF vs LO Power 2150MHz Conversion Gain, IIP3 and NF vs LO Power 28 22 28 22 20 26 20 26 20 24 18 24 18 24 16 22 16 22 IIP3 22 10 8 NF 12 6 10 8 GC 6 –6 –4 2 –2 0 LO INPUT POWER (dBm) 4 20 14 18 12 16 10 14 8 NF 20 14 6 10 4 8 2 8 0 6 0 6 –4 2 –2 0 LO INPUT POWER (dBm) 4 6 Conversion Gain, IIP3 and NF vs Supply Voltage (Single Supply) Conversion Gain, IIP3 and NF vs Supply Voltage (Dual Supply) 26 24 18 24 18 22 18 –40°C 16 25°C 14 85°C 12 16 10 8 NF 20 –40°C 25°C 85°C RF = 1950MHz 16 14 18 12 16 10 14 8 NF 12 6 10 4 10 8 2 8 2 6 0 3.6 6 0 5.5 GC 3 3.3 3.4 3.5 3.1 3.2 VCC, VCCIF SUPPLY VOLTAGE (V) 5592 G34 12 GC 3 VCC = 3.3V 4.5 5 4 3.5 VCCIF SUPPLY VOLTAGE (V) 5592 G35 6 4 SSB NF (dB) 14 IIP3 GC (dB), IIP3 (dBm), P1dB (dBm) 28 20 GC (dB), IIP3 (dBm) 22 26 SSB NF (dB) 28 20 VCC = VCCIF RF = 1950MHz 2 –2 0 LO INPUT POWER (dBm) 4 6 Conversion Gain, IIP3 and RF Input P1dB vs Temperature 22 20 0 –4 5592 G33 26 IIP3 2 –6 28 22 GC 5592 G32 5592 G31 8 NF 4 2 –6 10 16 10 6 14 12 18 4 GC 16 –40°C 25°C 85°C 12 6 12 18 IIP3 SSB NF (dB) 16 14 20 –40°C 25°C 85°C SSB NF (dB) 18 –40°C 25°C 14 85°C 12 IIP3 GC (dB), IIP3 (dBm) 22 26 GC (dB), IIP3 (dBm) 28 SSB NF (dB) GC (dB), IIP3 (dBm) 55 45 6 1600 1700 1800 1900 2000 2100 2200 2300 RF FREQUENCY (MHz) 6 6 1600 1700 1800 1900 2000 2100 2200 2300 RF FREQUENCY (MHz) GC (dB), IIP3 (dBm) 60 12 9 12 –40°C 25°C 85°C 65 13 13 SSB NF (dB) –40°C 25°C 85°C 105°C 20 14 14 GC (dB) IIP3 (dBm) 22 –40°C 25°C 85°C 105°C ISOLATION (dB) 24 Channel Isolation vs RF Frequency 70 24 22 IIP3 VCCIF = 3.3V VCCIF = 5V 20 18 RF = 1950MHz 16 14 P1dB 12 10 8 6 –40 GC 50 80 20 –10 CASE TEMPERATURE (°C) 110 5592 G36 5592f 8 LTC5592 TYPICAL DC PERFORMANCE CHARACTERISTICS ISEL = Low, ENA = ENB = High, test circuit shown in Figure 1. VCC Supply Current vs Supply Voltage (Mixer + LO Amplifier) 206 VCCIF Supply Current vs Supply Voltage (IF Amplifier) 270 VCCIF = VCC 204 Total Supply Current vs Temperature (VCC + VCCIF) 480 VCC = 3.3V 105°C 250 460 VCC = 3.3V, VCCIF = 5V (DUAL SUPPLY) 85°C 200 198 25°C 196 –40°C 194 SUPPLY CURRENT (mA) 105°C SUPPLY CURRENT (mA) SUPPLY CURRENT (mA) 440 202 85°C 230 210 25°C 190 170 –40°C 3 3.1 3.3 3.4 3.5 3.2 VCC SUPPLY VOLTAGE (V) 3 3.6 VCC = VCCIF = 3.3V (SINGLE SUPPLY) 380 360 340 300 130 190 400 320 150 192 420 3.3 3.6 3.9 4.2 4.5 4.8 5.1 VCCIF SUPPLY VOLTAGE (V) 280 –40 5.4 20 50 80 –10 CASE TEMPERATURE (°C) 5592 G38 5592 G37 110 5592 G39 ISEL = High, ENA = ENB = High, test circuit shown in Figure 1. VCC Supply Current vs Supply Voltage (Mixer + LO Amplifier) 170 VCCIF = VCC SUPPLY CURRENT (mA) SUPPLY CURRENT (mA) 85°C 130 25°C 128 –40°C 290 105°C 134 105°C 300 VCC = 3.3V 160 132 Total Supply Current vs Temperature (VCC + VCCIF) 150 SUPPLY CURRENT (mA) 136 VCCIF Supply Current vs Supply Voltage (IF Amplifier) 85°C 140 130 25°C 120 110 –40°C 100 280 270 VCC = 3.3V, VCCIF = 5V (DUAL SUPPLY) 260 250 VCC = VCCIF = 3.3V (SINGLE SUPPLY) 240 230 126 124 3 3.1 3.3 3.4 3.5 3.2 VCC SUPPLY VOLTAGE (V) 3.6 5592 G40 90 220 80 210 –40 3 3.3 3.6 3.9 4.2 4.5 4.8 5.1 VCCIF SUPPLY VOLTAGE (V) 5.4 5592 G41 20 50 80 –10 CASE TEMPERATURE (°C) 110 5592 G42 5592f 9 LTC5592 PIN FUNCTIONS RFA, RFB (Pins 1, 6): Single-Ended RF Inputs for Channels A and B. These pins are internally connected to the primary sides of the RF input transformers, which have low DC resistance to ground. Series DC-blocking capacitors should be used to avoid damage to the integrated transformer when DC voltage is present at the RF inputs. The RF inputs are impedance matched when the LO input is driven with a 0±6dBm source between 1.7GHz and 2.5GHz and the channels are enabled. CTA, CTB (Pins 2, 5): RF Transformer Secondary CenterTap on Channels A and B. These pins may require bypass capacitors to ground to optimize IIP3 performance. Each pin has an internally generated bias voltage of 1.2V and must be DC-isolated from ground and VCC. GND (Pins 3, 4, 7, 13, 15, 24, Exposed Pad Pin 25): Ground. These pins must be soldered to the RF ground plane on the circuit board. The exposed pad metal of the package provides both electrical contact to ground and good thermal contact to the printed circuit board. IFGNDB, IFGNDA (Pins 8, 23): DC Ground Returns for the IF Amplifiers. These pins must be connected to ground to complete the DC current paths for the IF amplifiers. Chip inductors may be used to tune LO-IF and RF-IF leakage. Typical DC current is 101mA for each pin. IFB+, IFB–, IFA–, IFA+ (Pins 9, 10, 21, 22): Open-Collector Differential Outputs for the IF Amplifiers of Channels B and A. These pins must be connected to a DC supply through impedance matching inductors, or transformer center-taps. Typical DC current consumption is 50.5mA into each pin. IFBB, IFBA (Pins 11, 20): Bias Adjust Pins for the IF Amplifiers. These pins allow independent adjustment of the internal IF buffer currents for channels B and A, respectively. The typical DC voltage on these pins is 2.2V. If not used, these pins must be DC isolated from ground and VCC. VCCB and VCCA (Pins 12, 19): Power Supply Pins for the LO Buffers and Bias Circuits. These pins must be connected to a regulated 3.3V supply with bypass capacitors located close to the pins. Typical current consumption is 99.5mA per pin. ENB, ENA (Pins 14, 17): Enable Pins. These pins allow Channels B and A, respectively, to be independently enabled. An applied voltage of greater than 2.5V activates the associated channel while a voltage of less than 0.3V disables the channel. Typical input current is less than 10μA. These pins must not be allowed to float. LO (Pin 16): Single-Ended Local Oscillator Input. This pin is internally connected to the primary side of the LO input transformer and has a low DC resistance to ground. Series DC-blocking capacitors should be used to avoid damage to the integrated transformer when DC voltage present at LO input. The LO input is internally matched to 50Ω for all states of ENA and ENB. ISEL (Pin 18): Low Power Select Pin. When this pin is pulled low (<0.3V), both mixer channels are biased at the normal current level for best RF performance. When greater than 2.5V is applied, both channels operate at reduced current, which provides reasonable performance at lower power consumption. This pin must not be allowed to float. 5592f 10 LTC5592 BLOCK DIAGRAM 24 GND 23 22 IFGNDA IFA+ 21 IFA– 20 19 IFBA VCCA IF AMP 1 2 BIAS ISEL ENA RFA LO AMP CTA LO 18 17 16 3 GND 4 GND CTB 5 6 GND 15 LO AMP RFB ENB IF AMP 14 BIAS GND 13 7 IFB+ IFGNDB GND 8 9 IFB– 10 IFBB 11 VCCB 12 5592 BD 5592f 11 LTC5592 TEST CIRCUIT T1A 4:1 IFA 50Ω C7A L1A VCCIF 3.3V TO 5V RF 0.015” L2A GND DC1710A EVALUATION BOARD BIAS STACK-UP GND (NELCO N4000-13) 0.062” C6 VCC 3.3V C5A 24 C1A RFA 50Ω 23 GND IFGNDA 22 21 IFA+ – IFA C3A 20 19 IFBA VCCA C4 ISEL 18 ISEL (0V/3.3V) 2 CTA ENA 17 ENA (0V/3.3V) 3 GND LO 16 1 RFA 0.015” LTC5592 C8A C2 LO 50Ω 25 GND 4 GND GND 15 5 CTB ENB 14 C8B ENB (0V/3.3V) C1B RFB 50Ω 6 RFB GND 13 GND IFGNDB IFB+ 7 8 9 IFB– IFBB VCCB 10 11 12 5592 TC01 C3B C5B L2B L1B C7B 4:1 T1B IFB 50Ω REF DES L1, L2 vs IF FREQUENCIES VALUE SIZE VENDOR C1A, C1B 22pF 0402 AVX C2 2.2pF 0402 AVX IF (MHz) L1, L2 (nH) C3A, C3B C5A, C5B 22pF 0402 AVX 140 270 C4, C6 1μF 0603 AVX 190 150 C7A, C7B 1000pF 0402 AVX 240 100 C8A, C8B 4.7pF 0402 AVX 300 56 0603 Coilcraft 33 L1A, L1B L2A, L2B 150nH 380 450 22 T1A, T1B TC4-1W-7ALN+ Mini-Circuits Figure 1. Standard Downmixer Test Circuit Schematic (190MHz IF) 5592f 12 LTC5592 APPLICATIONS INFORMATION Introduction The LTC5592 consists of two identical mixer channels driven by a common LO input signal. Each high linearity mixer consists of a passive double-balanced mixer core, IF buffer amplifier, LO buffer amplifier and bias/enable circuits. See the Pin Functions and Block Diagram sections for a description of each pin. Each of the mixers can be shutdown independently to reduce power consumption and low current mode can be selected that allows a trade-off between performance and power consumption. The RF and LO inputs are single-ended and are internally matched to 50Ω. Low side or high side LO injection can be used. The IF outputs are differential. The evaluation circuit, shown in Figure 1, utilizes bandpass IF output matching and an IF transformer to realize a 50Ω single-ended IF output. The evaluation board layout is shown in Figure 2. The secondary winding of the RF transformer is internally connected to the channel A passive mixer core. The center-tap of the transformer secondary is connected to Pin 2 (CTA) to allow the connection of bypass capacitor, C8A. The value of C8A can be adjusted to improve channel isolation at specific RF frequencies with minor impact to conversion gain, linearity and noise performance. When used, it should be located within 2mm of Pin 2 for proper high frequency decoupling. The nominal DC voltage on the CTA pin is 1.2V. For the RF inputs to be properly matched, the appropriate LO signal must be applied to the LO input. A broadband input match is realized with C1A = 22pF. The measured input return loss is shown in Figure 4 for LO frequencies of 1.7GHz, 2.16GHz and 2.5GHz. These LO frequencies correspond to lower, middle and upper values in the LO range. As shown in Figure 4, the RF input impedance is dependent on LO frequency, although a single value of C1A is adequate to cover the 1.7GHz to 2.5GHz RF band. LTC5592 RFA TO CHANNEL A MIXER C1A 1 2 RFA CTA C8A 5592 F03 5592 F02 Figure 3. Channel A RF Input Schematic 0 Figure 2. Evaluation Board Layout (DC1710A) The RF inputs of channels A and B are identical. The RF input of channel A, shown in Figure 3, is connected to the primary winding of an integrated transformer. A 50Ω match is realized when a series external capacitor, C1A, is connected to the RF input. C1A is also needed for DC blocking if the source has DC voltage present, since the primary side of the RF transformer is internally DC-grounded. The DC resistance of the primary is approximately 3.9Ω. –5 RETURN LOSS (dB) RF Inputs LO = 1700MHz LO = 2160MHz LO = 2500MHz –10 –15 –20 –25 1500 1700 1900 2100 2300 FREQUENCY (MHz) 2500 2700 5592 F04 Figure 4. RF Port Return Loss 5592f 13 LTC5592 APPLICATIONS INFORMATION Table 1. RF Input Impedance and S11 (at Pin 1, No External Matching, fLO = 2.16GHz) FREQUENCY (GHz) RF INPUT IMPEDANCE S11 MAG ANGLE 1.6 66.0 + j6.8 0.15 20 1.7 62.4 + j0.5 0.11 2 1.8 57.9 – j3.8 0.08 –24 1.9 53.2 – j6.1 0.07 –59 2.0 48.5 – j8.8 0.09 –95 2.1 40.6 – j9.3 0.14 –130 2.2 35.0 – j0.1 0.18 –180 2.3 39.3 + j3.7 0.13 –201 2.4 41.2 + j3.9 0.11 –207 2.5 41.7 + j4.3 0.10 –211 2.6 42.8 + j4.1 0.09 –212 2.7 44.1 + j3.6 0.07 –213 The secondary of the transformer drives a pair of high speed limiting differential amplifiers for channels A and B. The LTC5592’s LO amplifiers are optimized for the 1.7GHz to 2.5GHz LO frequency range; however, LO frequencies outside this frequency range may be used with degraded performance. The LO port is always 50Ω matched when VCC is applied, even when one or both of the channels is disabled. This helps to reduce frequency pulling of the LO source when the mixer is switched between different operating states. Figure 6 illustrates the LO port return loss for the different operating modes. 0 BOTH CHANNELS ON ONE CHANNEL ON BOTH CHANNELS OFF –5 RETURN LOSS (dB) The RF input impedance and input reflection coefficient, versus RF frequency, are listed in Table 1. The reference plane for this data is Pin 1 of the IC, with no external matching, and the LO is driven at 2.16GHz. –10 –15 –20 –25 ISEL LTC5592 BIAS ENA –30 1700 18 Figure 6. LO Input Return Loss C2 TO MIXER B ENB BIAS 2500 5592 F06 17 TO MIXER A LO 1900 2100 2300 FREQUENCY (MHz) LO 16 The nominal LO input level is 0dBm, though the limiting amplifiers will deliver excellent performance over a ±6dBm input power range. Table 2 lists the LO input impedance and input reflection coefficient versus frequency. 14 5592 F05 Figure 5. LO Input Schematic LO Input The LO input, shown in Figure 5, is connected to the primary winding of an integrated transformer. A 50Ω impedance match is realized at the LO port by adding an external series capacitor, C2. This capacitor is also needed for DC blocking if the LO source has DC voltage present, since the primary side of the LO transformer is DC-grounded internally. The DC resistance of the primary is approximately 1.8Ω. Table 2. LO Input Impedance vs Frequency (at Pin 16, No External Matching, ENA = ENB = High) S11 FREQUENCY (GHz) INPUT IMPEDANCE MAG ANGLE 1.7 46.4 + j34.4 0.34 76 1.8 47.0 + j31.0 0.31 78 1.9 46.5 + J28.2 0.28 81 2.0 44.4 + J26.8 0.28 86 2.1 43.1 + j26.0 0.28 89 2.2 41.8 + j26.2 0.29 91 2.3 40.4 + j27.4 0.31 92 2.4 38.8 + j28.5 0.33 94 2.5 38.0 + j30.4 0.35 93 5592f 14 LTC5592 APPLICATIONS INFORMATION IF Outputs The IF amplifiers in channels A and B are identical. The IF amplifier for channel A, shown in Figure 7, has differential open collector outputs (IFA+ and IFA–), a DC ground return pin (IFGNDA), and a pin for adjusting the internal bias (IFBA). The IF outputs must be biased at the supply voltage (VCCIFA), which is applied through matching inductors L1A and L2A. Alternatively, the IF outputs can be biased through the center tap of a transformer (T1A). The common node of L1A and L2A can be connected to the center tap of the transformer. Each IF output pin draws approximately 50.5mA of DC supply current (101mA total). An external load resistor, R2A, can be used to improve impedance matching if desired. IFGNDA (Pin 23) must be grounded or the amplifier will not draw DC current. Inductor L3A may improve LO-IF and RF-IF leakage performance in some applications, but is otherwise not necessary. Inductors should have small resistance for DC. High DC resistance in L3A will reduce the IF amplifier supply current, which will degrade RF performance. T1A For optimum single-ended performance, the differential IF output must be combined through an external IF transformer or a discrete IF balun circuit. The evaluation board (see Figures 1 and 2) uses a 4:1 IF transformer for impedance transformation and differential to single-ended conversion. It is also possible to eliminate the IF transformer and drive differential filters or amplifiers directly. The IF output impedance can be modeled as 379Ω in parallel with 2.2pF. The equivalent small-signal model, including bondwire inductance, is shown in Figure 8. Frequency-dependent differential IF output impedance is listed in Table 3. This data is referenced to the package pins (with no external components) and includes the effects of IC and package parasitics. 22 LTC5592 21 IFA+ 0.9nH IFA– 0.9nH RIF CIF IFA 5592 F08 4:1 Figure 8. IF Output Small-Signal Model C7A L1A L2A R1A (OPTION TO REDUCE DC POWER) VCCIFA L3A (OR SHORT) 101mA 23 IGNDA C5A 22 IFA+ R2A LTC5592 21 20 IFBA IFA– VCCA IF AMP 4mA Bandpass IF Matching The bandpass IF matching configuration, shown in Figures 1 and 7, is best suited for IF frequencies in the 90MHz to 500MHz range. Resistor R2A may be used to reduce the IF output resistance for greater bandwidth and inductors L1A and L2A resonate with the internal IF output capacitance at the desired IF frequency. The value of L1A, L2A can be estimated as follows: L1A = L2A = BIAS 5592 F07 Figure 7. IF Amplifier Schematic with Bandpass Match 1 (2fIF ) 2 • 2 • CIF where CIF is the internal IF capacitance (listed in Table 3). 5592f 15 LTC5592 APPLICATIONS INFORMATION Values of L1A and L2A are tabulated in Figure 1 for various IF frequencies. The measured IF output return loss for bandpass IF matching is plotted in Figure 9. T1A VCCIFA 3.1 TO 5.3V C6 C5A L1A Table 3. IF Output Impedance vs Frequency L2A R2A FREQUENCY (MHz) DIFFERENTIAL OUTPUT IMPEDANCE (RIF || XIF (CIF)) 90 403 || – j610 (2.9pF) 140 384 || – j474 (2.4pF) 190 379 || – j381 (2.2pF) 240 380 || – j316 (2.1pF) 300 377 || – j253 (2.1pF) 380 376 || – j210 (2.0pF) 450 360 || – j177 (2.0pF) C9A 22 IFA+ 21 LTC5592 IFA– 5592 F10 Figure 10. IF Output with Lowpass Matching 0 –5 RETURN LOSS (dB) 0 –5 RETURN LOSS (dB) IFA 50Ω 4:1 –10 180nH –10 68nH –15 82nH + 1k 270nH –15 150nH –20 100nH 100nH –25 –20 0 56nH 22nH 33nH –25 50 100 150 FREQUENCY (MHz) 200 250 5592 F11 50 100 150 200 250 300 350 400 450 500 FREQUENCY (MHz) 5592 F09 Figure 9. IF Output Return Loss with Bandpass Matching Figure 11. IF Output Return Loss with Lowpass Matching board (see Figure 2) has been laid out to accommodate this matching topology with only minor modifications. Lowpass IF Matching IF Amplifier Bias For IF frequencies below 90MHz, the inductance values become unreasonably high and the lowpass topology shown in Figure 10 is preferred. This topology also can provide improved RF to IF and LO to IF isolation. VCCIFA is supplied through the center tap of the 4:1 transformer. A lowpass impedance transformation is realized by shunt elements R2A and C9A (in parallel with the internal RIF and CIF), and series inductors L1A and L2A. Resistor R2A is used to reduce the IF output resistance for greater bandwidth, or it can be omitted for the highest conversion gain. The final impedance transformation to 50Ω is realized by transformer T1A. The measured return loss is shown in Figure 11 for different values of inductance (C9A = open). The case with 82nH inductors and a 1k load resistor (R2A) is also shown. The LTC5592 demo The IF amplifier delivers excellent performance with VCCIF = 3.3V, which allows a single supply to be used for VCC and VCCIF . At VCCIF = 3.3V, the RF input P1dB of the mixer is limited by the output voltage swing. For higher P1dB, in this case, resistor R2A (Figure 7) can be used to reduce the output impedance and thus the voltage swing, thus improving P1dB. The trade-off for improved P1dB will be lower conversion gain. With VCCIF increased to 5V the P1dB increases by over 3dB, at the expense of higher power consumption. Mixer P1dB performance at 1950MHz and 2350MHz is tabulated in Table 4 for VCCIF values of 3.3V and 5V. For the highest conversion gain, high-Q wire-wound chip inductors are recommended for L1A and L2A. Low cost multilayer chip inductors may be substituted, with a slight reduction in conversion gain. 5592f 16 LTC5592 APPLICATIONS INFORMATION Table 4. Performance Comparison with VCCIF = 3.3V and 5V Low Power Mode (RF = 1950MHz, High Side LO, IF = 190MHz) Both mixer channels can be set to low power mode using the ISEL pin. This allows flexibility to select a reduced current mode of operation when lower RF performance is acceptable, reducing power consumption by 37%. Figure 12 shows a simplified schematic of the ISEL pin interface. When ISEL is set low (<0.3V), both channels operate at nominal DC current. When ISEL is set high (>2.5V), the DC current in both channels is reduced, thus reducing power consumption. The performance in low power mode and normal power mode are compared in Table 6. VCCIF (V) R2A (Ω) 3.3 Open 202 8.7 10.6 25.4 9.8 1k 202 7.5 11.3 25.4 9.9 Open 209 8.7 14.0 25.5 9.9 5 ICCIF (mA) GC (dB) P1dB (dBm) IIP3 (dBm) NF (dB) (RF = 2350MHz, Low Side LO, IF = 190MHz) VCCIF (V) R2A (Ω) ICCIF (mA) GC (dB) P1dB (dBm) IIP3 (dBm) NF (dB) 3.3 Open 202 8.3 11.0 27.3 9.8 1k 202 7.1 11.8 27.5 9.8 Open 209 8.1 14.6 28.0 10.0 5 LTC5592 VCCA 19 The IFBA pin (Pin 20) is available for reducing the DC current consumption of the IF amplifier, at the expense of IIP3. The nominal DC voltage at Pin 20 is 2.1V, and this pin should be left open-circuited for optimum performance. The internal bias circuit produces a 4mA reference for the IF amplifier, which causes the amplifier to draw approximately 101mA. If resistor R1A is connected to Pin 20 as shown in Figure 7, a portion of the reference current can be shunted to ground, resulting in reduced IF amplifier current. For example, R1A = 1k will shunt away 1.5mA from Pin 20 and the IF amplifier current will be reduced by 25% to approximately 75.5mA. Table 5 summarizes RF performance versus IF amplifier current. ISEL 500Ω 18 BIAS A VCCB BIAS B 5592 F13 Figure 12. ISEL Interface Schematic Table 6. Performance Comparison Between Different Power Modes RF = 1950MHz, High Side LO, IF = 190MHz, VCC = VCCIF = 3.3V Table 5. Mixer Performance with Reduced IF Amplifier Current ISEL ITOTAL (mA) GC (dB) IIP3 (dBm) P1dB (dBm) NF (dB) RF = 1950MHz, High Side LO, IF = 190MHz, VCC = VCCIF = 3.3V Low 401 8.7 25.4 10.6 9.8 High 252 7.4 21.2 10.9 10.2 R1 ICCIF (mA) GC (dB) IIP3 (dBm) P1dB (dBm) NF (dB) Open 202 8.7 25.4 10.6 9.8 4.7kΩ 184 8.5 25.2 10.8 9.8 2.2kΩ 170 8.4 24.8 10.9 9.7 1kΩ 151 8.1 24.4 11.1 9.8 RF = 2350MHz, Low Side LO, IF = 190MHz, VCC = VCCIF = 3.3V ISEL ITOTAL (mA) GC (dB) IIP3 (dBm) P1dB (dBm) NF (dB) Low 401 8.3 27.3 11.0 9.8 High 252 7.1 22.3 11.3 10.2 RF = 2350MHz, Low Side LO, IF = 190MHz, VCC = VCCIF = 3.3V R1 ICCIF (mA) GC (dB) IIP3 (dBm) P1dB (dBm) NF (dB) Open 202 8.3 27.3 11.0 9.8 4.7kΩ 184 8.1 26.8 11.2 9.8 2.2kΩ 170 8.0 26.2 11.2 9.8 1kΩ 151 7.7 25.4 11.3 9.8 5592f 17 LTC5592 APPLICATIONS INFORMATION Enable Interface Table 7. IF Output Spur Levels (dBc), High Side LO Figure 13 shows a simplified schematic of the ENA pin interface (ENB is identical). To enable channel A, the ENA voltage must be greater than 2.5V. If the enable function is not required, the enable pin can be connected directly to VCC. The voltage at the enable pin should never exceed the power supply voltage (VCC) by more than 0.3V. If this should occur, the supply current could be sourced through the ESD diode, potentially damaging the IC. (RF = 1950MHz, PRF = –3dBm, PLO = 0dBm, VCC = VCCIF = 3.3V, TC = 25°C) N 0 1 2 3 4 5 6 7 8 9 0 – –45.2 –46.9 –68.4 –70.8 –75.3 –72.0 –82.0 1 –51.0 0 –64.4 –54.5 –68.1 –66.3 –74.9 –72.2 2 –80.0 –80.9 –60.6 * –81.4 * * * * 3 * –83.5 * –75.8 * * * * * * 4 * * * * * * * * * * M 5 * * * * * * * * * * 6 * * * * * * * * * * 7 * * * * * * * * * * 8 * * * * * * * * * 9 * * * * * * * * 10 * * * * * * * *Less than –90dBc LTC5592 VCCA 19 ESD CLAMP ENA 500Ω 17 Table 8. IF Output Spur Levels (dBc), Low Side LO 5592 F13 Figure 13. ENA Interface Schematic The Enable pins must be pulled high or low. If left floating, the on/off state of the IC will be indeterminate. If a three-state condition can exist at the enable pins, then a pull-up or pull-down resistor must be used. Supply Voltage Ramping Fast ramping of the supply voltage can cause a current glitch in the internal ESD protection circuits. Depending on the supply inductance, this could result in a supply voltage transient that exceeds the maximum rating. A supply voltage ramp time of greater than 1ms is recommended. (RF = 2350MHz, PRF = –3dBm, PLO = 0dBm, VCC = VCCIF = 3.3V, TC = 25°C) N 0 1 2 3 4 5 6 7 8 9 0 – –44.9 –46.2 –69.9 –69.7 –78.0 –71.9 1 –50.7 0 –63.1 –45.7 –67.0 –68.9 –71.1 –72.2 * 2 –77.8 –78.7 –66.5 * –89.1 * * * * * 3 * * * –70.1 * * * * * * 4 * * * * * * * * * * M 5 * * * * * * * * * * 6 * * * * * * * * * * 7 * * * * * * * * * 8 * * * * * * * * 9 * * * * * * * 10 * * * * * * *Less than –90dBc Spurious Output Levels Mixer spurious output levels versus harmonics of the RF and LO are tabulated in Tables 7 and 8 for frequencies up to 10GHz. The spur levels were measured on a standard evalution board using the test circuit shown in Figure 1. The spur frequencies can be calculated using the following equation: fSPUR = (M • fRF) – (N • fLO) 5592f 18 LTC5592 PACKAGE DESCRIPTION Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. UH Package 24-Lead Plastic QFN (5mm × 5mm) (Reference LTC DWG # 05-08-1747 Rev A) 0.75 p0.05 5.40 p0.05 3.90 p0.05 3.20 p 0.05 3.25 REF 3.20 p 0.05 PACKAGE OUTLINE 0.30 p 0.05 0.65 BSC RECOMMENDED SOLDER PAD LAYOUT APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED 5.00 p 0.10 R = 0.05 TYP 0.75 p 0.05 BOTTOM VIEW—EXPOSED PAD R = 0.150 TYP 23 0.00 – 0.05 PIN 1 NOTCH R = 0.30 TYP OR 0.35 s 45o CHAMFER 24 0.55 p 0.10 PIN 1 TOP MARK (NOTE 6) 1 2 3.20 p 0.10 5.00 p 0.10 3.25 REF 3.20 p 0.10 (UH24) QFN 0708 REV A 0.200 REF NOTE: 1. DRAWING IS NOT A JEDEC PACKAGE OUTLINE 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.20mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE 0.30 p 0.05 0.65 BSC 5592f Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 19 LTC5592 TYPICAL APPLICATION Downconverting Mixer with 470MHz IF TC4-1W-17LN+ 4:1 Conversion Gain, NF and IIP3 vs RF Frequency IFA 50Ω 29 14 IIP3 13 28 82nH 82nH 22pF 1μF 22pF TO CHANNEL B 22pF 27 11 10 26 NF 25 24 TA = 25°C IF = 470MHz 23 LOW SIDE LO 22 9 8 24 RFA 50Ω 1μF 12 23 22 GND IFGNDA IFA+ 21 20 TO CHANNEL B 19 IFA– IFBA VCCA 1 RFA ISEL 18 ISEL 2 CTA ENA 17 ENA 7 GC 6 2100 2200 2300 2400 2500 2600 RF FREQUENCY (MHz) IIP3 (dBm) VCC 3.3V VCCIF 3.3V GC (dB), SSB NF (dB) 1nF 21 2700 5592 TA02b LTC5592 CHANNEL A 2.2pF 3 GND LO 16 4 GND GND 15 4.7pF CHANNEL B NOT SHOWN LO 50Ω 5590 TA02 RELATED PARTS PART NUMBER DESCRIPTION Infrastructure LTC5569 300MHz to 4GHz, 3.3V Dual Active Downconverting Mixer LT5557 400MHz to 3.8GHz, 3.3V Downconverting Mixer LTC6416 2GHz 16-Bit ADC Buffer LTC6412 31dB Linear Analog VGA LTC554X 600MHz to 4GHz Downconverting Mixer Family LT5554 Ultralow Distort IF Digital VGA LT5578 400MHz to 2.7GHz Upconverting Mixer LT5579 1.5GHz to 3.8GHz Upconverting Mixer RF Power Detectors LTC5581 6GHz Low Power RMS Detector LTC5582 10GHz RMS Power Detector LTC5583 Dual 6GHz RMS Power Detector ADCs LTC2285 14-Bit, 125Msps Dual ADC LTC2185 16-Bit, 125Msps Dual ADC Ultralow Power LTC2242-12 12-Bit, 250Msps ADC COMMENTS 2dB Gain, 26.7dBm IIP3 and 11.7dB NF at 1950MHz, 3.3V/180mA Supply 2.9dB Gain, 24.7dBm IIP3 and 11.7dB NF at 1950MHz, 3.3V/82mA Supply 40.25dBm OIP3 to 300MHz, Programmable Fast Recovery Output Clamping 35dBm OIP3 at 240MHz, Continuous Gain Range –14dB to 17dB 8dB Gain, >25dBm IIP3, 10dB NF, 3.3V/200mA Supply 48dBm OIP3 at 200MHz, 2dB to 18dB Gain Range, 0.125dB Gain Steps 27dBm OIP3 at 900MHz, 24.2dBm at 1.95GHz, Integrated RF Transformer 27.3dBm OIP3 at 2.14GHz, NF = 9.9dB, 3.3V Supply, Single-Ended LO and RF Ports 40dB Dynamic Range, ±1dB Accuracy Over Temperature, 1.5mA Supply Current 40MHz to 10GHz, Up to 57dB Dynamic Range, ±0.5dB Accuracy Over Temperature 40MHz to 6GHz, Up to 60dB Dynamic Range, >40dB Channel-to-Channel Isolation 72.4dB SNR, >88dB SFDR, 790mW Power Consumption 74.8dB SNR, 185mW/Channel Power Consumption 65.4dB SNR, 78dB SFDR, 740mW Power Consumption 5592f 20 Linear Technology Corporation LT 0911 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2011