19-1147; Rev 1; 1/98 KIT ATION EVALU E L B AVAILA High-Speed, Low-Distortion, Differential Line Receivers ____________________________Features The MAX4144/MAX4145/MAX4146 differential line receivers offer unparalleled high-speed, low-distortion performance. Using a three op-amp instrumentation amplifier architecture, these ICs have fully symmetrical differential inputs and a single-ended output. They operate from ±5V power supplies and are capable of driving a 150Ω load to ±3.7V. The MAX4144 has an internally set closed-loop gain of +2V/V. The MAX4145 is optimized for gains from +1V/V to +10V/V, while the MAX4146 is optimized for gains from +10V/V to +100V/V. The MAX4145/MAX4146 require a single external resistor to set the closed-loop gain. MAX4144: These amplifiers use laser-trimmed, matched thin-film resistors to deliver a common-mode rejection (CMR) of up to 90dB at 10MHz. Using current-feedback techniques, the MAX4144 achieves a 130MHz bandwidth and a 1000V/µs slew rate. The MAX4145 achieves a bandwidth of 180MHz and a slew rate of 600V/µs while operating with a closed-loop gain of +1V/V, and the MAX4146 features a bandwidth of 70MHz and a slew rate of 800V/µs with a gain of +10V/V. Excellent differential gain/phase and noise specifications make these amplifiers ideal for a wide variety of video and RF signal-processing applications. MAX4145: For a complete differential transmission link, use the MAX4144/MAX4145/MAX4146 with the MAX4147 differential line driver (see the MAX4147 data sheet for more information). ________________________Applications ♦ +2V/V Internally Fixed Gain ♦ 130MHz Bandwidth ♦ 1000V/µs Slew Rate ♦ 70dB CMR at 10MHz ♦ -90dBc SFDR (f = 10kHz) ♦ Low Differential Gain/Phase: 0.03%/0.03° ♦ 800µA Shutdown ♦ External Gain Selection from +1V/V to +10V/V ♦ 180MHz Bandwidth ♦ 90MHz 0.1dB Gain Flatness ♦ 600V/µs Slew Rate ♦ 75dB CMR at 10MHz ♦ -92dBc SFDR (f = 10kHz) ♦ Very Low Noise: 3.8nV/√Hz (G = +10V/V) ♦ 800µA Shutdown MAX4146: ♦ External Gain Selection from +10V/V to +100V/V ♦ 70MHz Bandwidth (AV = +10V/V) ♦ 800V/µs Slew Rate Differential to Single-Ended Conversion ♦ 90dB CMR at 10MHz Twisted-Pair to Coaxial Converter ♦ -82dBc SFDR (f = 10kHz) High-Speed Instrumentation Amplifier ♦ Very Low Noise: 3.45nV/√Hz (G = +100V/V) Data Acquisition Medical Instrumentation High-Speed Differential Line Receiver ♦ 800µA Shutdown _______________Ordering Information TEMP. RANGE PIN-PACKAGE MAX4144ESD -40°C to +85°C 14 SO MAX4144EEE -40°C to +85°C 16 QSOP MAX4145ESD -40°C to +85°C 14 SO MAX4145EEE -40°C to +85°C 16 QSOP MAX4146ESD -40°C to +85°C 14 SO MAX4146EEE -40°C to +85°C 16 QSOP PART Pin Configurations appear at end of data sheet. Typical Application Circuit appears at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 For small orders, phone 408-737-7600 ext. 3468. MAX4144/MAX4145/MAX4146 ________________General Description MAX4144/MAX4145/MAX4146 High-Speed, Low-Distortion, Differential Line Receivers ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC to VEE) ..................................................12V Voltage on IN_, SHDN, REF, OUT, SENSE, RG_.................................(VEE - 0.3V) to (VCC + 0.3V) Short-Circuit Duration to Ground ........................................10sec Input Current (IN_, RG_)...................................................±10mA Output Current................................................................±120mA Continuous Power Dissipation (TA = +70°C) 14-Pin SO (derate 8.33mW/°C above +70°C)..............667mW 16-Pin QSOP (derate 8.33mW/°C above +70°C).........667mW Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10sec) .............................+300°C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. DC ELECTRICAL CHARACTERISTICS (VCC = +5V, VEE = -5V, SHDN = 0V, RL = ∞, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL Operating Supply Voltage Input Offset Voltage CONDITIONS MIN Guaranteed by PSR test TYP ±4.5 MAX UNITS ±5.5 V 8 mV VOS VIN = 0V 0.6 TCVOS VIN = 0V 5 IB VIN = 0V 9 20 µA Input Offset Current IOS VIN = 0V 0.1 2.5 µA Input Capacitance CIN 1 pF Differential Input Resistance RIN 1 MΩ Input Offset Voltage Drift Input Bias Current Differential Input Voltage Range Common-Mode Input Voltage Range Gain RL = 150Ω VCM AV MAX4144 -1V ≤ VOUT ≤ +1V, RL = 150Ω Gain Error MAX4145 MAX4146 -1V ≤ VOUT ≤ +1V, RL = 150Ω Gain Drift MAX4144 -1.55 1.55 MAX4145 -2.8/G 2.8/G MAX4146 -3.1/G 3.1/G -2.8 2.8 Guaranteed by CMR test -1V ≤ VOUT ≤ +1V, RL = 150Ω MAX4144 2 MAX4145 1 + (1.4kΩ/RG) MAX4146 10 + (14kΩ/RG) AV = 2V/V 0.02 2 AV = 1V/V 0.5 2 AV = 10V/V 1.5 5 AV = 10V/V 0.5 2 AV = 100V/V 1.5 5 MAX4144 20 MAX4145 5 + 15G MAX4146 14 + 0.9G Common-Mode Rejection CMR VCM = ±2.8V 60 80 Power-Supply Rejection PSR VS = ±4.5V to ±5.5V 70 85 Quiescent Supply Current Shutdown Supply Current ISHDN VSHDN ≥ 2V VSHDN ≥ 2V Shutdown Output Impedance VOUT RL = 150Ω RL = ∞ 2 V V V/V % ppm/°C dB dB 11 16 mA 0.8 2 mA MAX4144 1.4 MAX4145 1.4 MAX4146 2 RL = 100Ω Output Voltage Swing µV/°C kΩ ±3.6 ±3.1 ±3.4 ±3.7 ±3.8 _______________________________________________________________________________________ V High-Speed, Low-Distortion, Differential Line Receivers (VCC = +5V, VEE = -5V, SHDN = 0V, RL = ∞, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL Output Current Drive IOUT SHDN High Threshold VIH SHDN Low Threshold VIL SHDN Input Bias Current ISHDN CONDITIONS VOUT = ±1.7V MIN TYP 0°C ≤ TA ≤ +85°C 80 100 -40°C ≤ TA ≤ 0°C 60 MAX UNITS mA 2 V 0.8 VSHDN ≤ 0.8V VSHDN ≥ 2V V 75 150 0.06 2 µA AC ELECTRICAL CHARACTERISTICS (VCC = +5V, VEE = -5V, SHDN = 0V, RL = 150Ω, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER -3dB Bandwidth SYMBOL BW(-3dB) Full-Power Bandwidth FPBW CONDITIONS VOUT ≤ 0.1VRMS VOUT = 2Vp-p BW(0.1dB) Input Voltage Noise Density Input Current Noise Density Common-Mode Rejection Slew Rate en in CMR SR VOUT ≤ 0.1VRMS f = 1MHz 130 MAX4145 AV = 1V/V 180 AV = 10V/V 70 MAX4146 AV = 100V/V 30 MAX4144 AV = 2V/V 110 MAX4145 AV = 1V/V 180 AV = 10V/V 70 AV = 100V/V 30 MAX4144 AV = 2V/V 30 MAX4145 AV = 1V/V 90 MAX4146 AV = 10V/V 50 MAX4144 12 MAX4145 1.8 + (20/G) MAX4146 2.1 + (135/G) f = 1MHz 1.7 f = 10MHz -2V ≤ VOUT ≤ +2V to 0.1% Settling Time to 0.1% tS TYP AV = 2V/V MAX4146 0.1dB Bandwidth MIN MAX4144 -2V ≤ VOUT ≤ +2V to 0.01% MAX4144 70 MAX4145 75 MAX4146 90 MAX4144 1000 MAX4145 600 MAX4146 800 MAX4144 23 MAX4145 20 MAX4146 17 MAX4144 36 MAX4145 38 MAX4146 40 MAX UNITS MHz MHz MHz nV/√Hz pA/√Hz dB V/µs ns Enable Time from Shutdown 45 ns Disable Time to Shutdown 40 µs Differential Gain (Note 1) DG f = 3.58MHz MAX4144 0.03 MAX4145 0.01 MAX4146 0.12 % _______________________________________________________________________________________ 3 MAX4144/MAX4145/MAX4146 DC ELECTRICAL CHARACTERISTICS (continued) AC ELECTRICAL CHARACTERISTICS (continued) (VCC = +5V, VEE = -5V, SHDN = 0V, RL = 150Ω, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL Differential Phase (Note 1) CONDITIONS DP Spurious-Free Dynamic Range f = 3.58MHz SFDR MIN TYP MAX4144 0.03 MAX4145 0.06 MAX4146 0.07 MAX4144 f = 10kHz, MAX4145 VOUT = 2Vp-p MAX4146 AV = 2V/V -90 AV = 1V/V -92 AV = 10V/V -82 MAX4144 AV = 2V/V -66 AV = 1V/V -67 AV = 10V/V -48 f = 5MHz, MAX4145 VOUT = 2Vp-p MAX4146 MAX UNITS Degrees dBc Note 1: Differential gain and phase are tested using a modulated ramp, 100 IRE (0.714V). __________________________________________Typical Operating Characteristics (VCC = +5V, VEE = -5V, SHDN = 0V, RL = 150Ω, TA = +25°C, unless otherwise noted.) MAX4145 SMALL-SIGNAL GAIN vs. FREQUENCY (AV = +1) 1 0 GAIN (dB) 1 0 -1 5 -1 -2 3 2 1 0 -1 -3 -3 -4 -4 -5 -4 -5 -6 -5 1G 100k 10M 1M 100M 1G 100k 100M FREQUENCY (Hz) FREQUENCY (Hz) MAX4146 SMALL-SIGNAL GAIN vs. FREQUENCY (AV = +100) MAX4144 0.1dB GAIN FLATNESS vs. FREQUENCY (AV = +2) MAX4145 0.1dB GAIN FLATNESS vs. FREQUENCY (AV = +1) 0.5 0.3 NORMALIZED GAIN (dB) 3 2 1 0 -1 -2 VOUT = 100mVRMS 0.4 0.5 0.2 0.1 0 -0.1 -0.2 0.3 0.2 0.1 0 -0.1 -0.2 -3 -0.3 -0.3 -4 -0.4 -0.4 -5 -0.5 1M 10M FREQUENCY (Hz) 100M 1G 100k 1M 10M FREQUENCY (Hz) 100M 1G VOUT = 100mVRMS 0.4 1G MAX4144/46 TOC06a VOUT = 100mVRMS 100k 10M 1M FREQUENCY (Hz) NORMAILIZED GAIN (dB) 4 100M -2 -3 MAX444/46 TOC05 5 10M 1M VOUT = 100mVRMS 4 -2 100k 4 2 2 MAX4144/4146-04 NORMALIZED GAIN (dB) 3 VOUT = 100mVRMS 3 NORMALIZED GAIN (dB) VOUT = 100mVRMS MAX4144/6 TOC-02 4 4 MAX4144/6 TOC-01 5 MAX4146 SMALL-SIGNAL GAIN vs. FREQUENCY (AV = +10) MAX4144/6 TOC-03 MAX4144 SMALL-SIGNAL GAIN vs. FREQUENCY (AV = +2) NORMALIZED GAIN (dB) MAX4144/MAX4145/MAX4146 High-Speed, Low-Distortion, Differential Line Receivers -0.5 100k 1M 10M FREQUENCY (Hz) _______________________________________________________________________________________ 100M 1G High-Speed, Low-Distortion, Differential Line Receivers (VCC = +5V, VEE = -5V, SHDN = 0V, RL = 150Ω, TA = +25°C, unless otherwise noted.) VOUT = 2Vp-p 4 0.1 0 -0.1 -0.2 2 1 0 -1 -2 2 1 0 -1 -2 -3 -0.3 -3 -0.4 -4 -5 -0.5 -5 -6 10M 100M 10M 100M FREQUENCY (Hz) MAX4146 SMALL-SIGNAL GAIN vs. FREQUENCY (AV = +10) MAX4146 LARGE-SIGNAL GAIN vs. FREQUENCY (AV = +100) 3 MAX4144/6 TOC-09 NORMALIZED GAIN (dB) 1 2 1 0 -1 -2 100k -1 -2 -3 -4 -5 -4 -6 10M 100M 1G MAX4144 SMALL-SIGNAL PULSE RESPONSE (AV = +2) 0 -3 1M FREQUENCY (Hz) VOUT = 2Vp-p 2 1G VOLTAGE (20mV/div) VOUT = 100mVRMS 3 IN GND OUT GND -7 -5 100k 1M 10M 100M 1G 100k 1M 10M 100M 1G TIME (10ns/div) FREQUENCY (Hz) FREQUENCY (Hz) MAX4145 SMALL-SIGNAL PULSE RESPONSE (AV = +1) MAX4146 SMALL-SIGNAL PULSE RESPONSE (AV = +100) MAX4146 SMALL-SIGNAL PULSE RESPONSE (AV = +10) TOC-13 MAX4144/4146 TOC12 TOC-14 NORMALIZED GAIN (dB) 1M FREQUENCY (Hz) 5 4 100k 1G TOC-11 1M -4 MAX4144/4146-10 100k VOUT = 2Vp-p 3 NORMALIZED GAIN (dB) NORMALIZED GAIN (dB) 3 0.2 4 MAX4144/4146-07 VOUT = 100mVRMS 0.3 OUT GND TIME (10ns/div) IN OUT GND TIME (10ns/div) GND 1mV/div GND OUT GND 20mV/div IN GND VOLTAGE VOLTAGE (50mV/div) IN VOLTAGE (20mV/div) NORMALIZED GAIN (dB) 5 MAX4144/46 TOC06 0.5 0.4 MAX4145 LARGE-SIGNAL GAIN vs. FREQUENCY (AV = +1) MAX4144 LARGE-SIGNAL GAIN vs. FREQUENCY (AV = +2) MAX4144/46 TOC-8 MAX4146 0.1dB GAIN FLATNESS vs. FREQUENCY (AV = +10) TIME (10ns/div) _______________________________________________________________________________________ 5 MAX4144/MAX4145/MAX4146 _____________________________Typical Operating Characteristics (continued) _____________________________Typical Operating Characteristics (continued) (VCC = +5V, VEE = -5V, SHDN = 0V, RL = 150Ω, TA = +25°C, unless otherwise noted.) MAX4145 LARGE-SIGNAL PULSE RESPONSE (AV = +1) MAX4144 LARGE-SIGNAL PULSE RESPONSE (AV = +2) GND MAX4146 LARGE-SIGNAL PULSE RESPONSE (AV = +100) GND CLOSED-LOOP OUTPUT IMPEDANCE vs. FREQUENCY (AV = +1) MAX4144 DIFFERENTIAL GAIN AND PHASE MAXXXXXX 10 0.01 0 -0.01 -0.02 -0.03 -0.04 AV = 2V/V 0 1 100 IRE 0.1 0.01 100k TIME (10ns/div) OUT TIME (10ns/div) PHASE (deg) GND CLOSED-LOOP OUTPUT IMPEDANCE (Ω) OUT (500mV/div) VOLTAGE (20mV/div) GND GND TIME (10ns/div) 100 TOC-18 IN TOC-17 OUT IN MAX4144/6 TOC-20 GND GND VOLTAGE (500mV/div) OUT IN GAIN (%) GND VOLTAGE (1V/div) TOC-15 VOLTAGE (500mV/div) IN MAX4146 LARGE-SIGNAL PULSE RESPONSE (AV = +10) MAX4144/46 TOC16 TIME (10ns/div) 1M 10M 100M 0.04 0.03 0.02 0.01 0 -0.01 1G AV = 2V/V 0 100 IRE FREQUENCY (Hz) MAX4146 DIFFERENTIAL GAIN AND PHASE 100 AV = 1V/V 0 100 IRE 100 IRE PHASE (deg) 0.08 0.06 0.04 0.02 0 -0.02 AV = 10V/V 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.10 MAX4144/4146-23 -0.05 -0.15 0 IRE 9.0 8.0 OUTPUT SWING (Vp-p) 0 -0.10 AV = 1V/V 0 6 OUTPUT SWING vs. LOAD RESISTANCE MAX4144/6 TOC-22 0.05 GAIN (%) 0.05 0 -0.05 -0.10 -0.15 -0.20 MAX4144/6 TOC-21 GAIN (%) MAX4145 DIFFERENTIAL GAIN AND PHASE PHASE (deg) MAX4144/MAX4145/MAX4146 High-Speed, Low-Distortion, Differential Line Receivers 7.0 6.0 5.0 4.0 AV = 10V/V 3.0 0 100 IRE 0 50 100 150 LOAD (Ω) _______________________________________________________________________________________ 200 250 High-Speed, Low-Distortion, Differential Line Receivers (VCC = +5V, VEE = -5V, SHDN = 0V, RL = 150Ω, TA = +25°C, unless otherwise noted.) -20 -40 3RD HARMONIC -60 -70 2ND HARMONIC -60 -50 -60 -90 -100 -100 -100 10M 100M 100k 1M 10M 100k 100M MAX4146 HARMONIC DISTORTION vs. FREQUENCY (AV = +100) MAX4144 5MHz HARMONIC DISTORTION vs. LOAD (AV = +2) MAX4145 5MHz HARMONIC DISTORTION vs. LOAD (AV = +1) -60 -30 -40 -50 -60 2ND HARMONIC -80 -80 -90 -90 -100 1M 10M 100M -30 -40 -50 -60 2ND HARMONIC -70 3RD HARMONIC -80 3RD HARMONIC -90 -100 -100 100k MAX4145 -20 -70 3RD HARMONIC VOUT = 2Vp-p -10 DISTORTION (dBc) -50 -70 -20 DISTORTION (dBc) -40 VOUT = 2Vp-p -10 0 MAX4144/4146-26 0 MAX4144/4146 TOC-27 2ND HARMONIC -30 0 200 400 600 800 0 1k 200 400 600 800 FREQUENCY (Hz) LOAD (Ω) LOAD (Ω) MAX4146 5MHz HARMONIC DISTORTION vs. LOAD (AV = +10) MAX4146 5MHz HARMONIC DISTORTION vs. LOAD (AV = +100) MAX4144 5MHz HARMONIC DISTORTION vs. OUTPUT SWING (AV = +2) -40 2ND HARMONIC -50 -20 DISTORTION (dBc) -30 -10 -60 3RD HARMONIC -30 -40 2ND HARMONIC -50 -60 0 3RD HARMONIC -10 -20 -30 -40 -60 -70 -80 -80 -80 -90 -90 -90 -100 200 400 600 LOAD (Ω) 800 1k 3RD HARMONIC -50 -70 -100 1k MAX4144/46 TOC-32 -20 VOUT = 2Vp-p DISTORTION (dBc) VOUT = 2Vp-p MAX4144/4146-31 0 MAX4144/4146-30 0 0 100M FREQUENCY (Hz) -20 -70 10M FREQUENCY (Hz) VOUT = 2Vp-p -10 1M FREQUENCY (Hz) 0 -10 3RD HARMONIC -80 3RD HARMONIC -90 1M 2ND HARMONIC -40 -70 -80 2ND HARMONIC -30 -90 100k DISTORTION (dBc) -40 -50 -20 -70 -80 DISTORTION (dBc) -30 VOUT = 2Vp-p -10 DISTORTION (dBc) -30 DISTORTION (dBc) DISTORTION (dBc) -20 VOUT = 2Vp-p -10 0 MAX4144/46 TOC25 VOUT = 2Vp-p -50 0 MAX4144/46/ TOC-24 0 -10 MAX4146 HARMONIC DISTORTION vs. FREQUENCY (AV = +10) MAX4145 HARMONIC DISTORTION vs. FREQUENCY (AV = +1) MAX4144/4146 TOC-26 MAX4144 HARMONIC DISTORTION vs. FREQUENCY (AV = +2) 2ND HARMONIC -100 0 200 400 600 LOAD (Ω) 800 1k 0.5 1.0 1.5 2.0 2.5 3.0 3.5 VOLTAGE SWING (Vp-p) _______________________________________________________________________________________ 7 MAX4144/MAX4145/MAX4146 _____________________________Typical Operating Characteristics (continued) _____________________________Typical Operating Characteristics (continued) (VCC = +5V, VEE = -5V, SHDN = 0V, RL = 150Ω, TA = +25°C, unless otherwise noted.) MAX4146 5MHz HARMONIC DISTORTION vs. OUTPUT SWING (AV = +10) -20 -30 -30 2ND HARMONIC -60 -70 -80 3RD HARMONIC -90 -100 1.0 1.5 2.0 2.5 3.0 3.5 3RD HARMONIC -30 -50 -60 -70 -80 -80 -90 -90 -100 -100 0.5 1.0 1.5 2.0 2.5 3.0 0.5 3.5 1.0 1.5 2.0 2.5 3.0 OUTPUT SWING (Vp-p) MAX4144 VOLTAGE NOISE DENSITY vs. FREQUENCY (AV = +2) MAX4145 VOLTAGE NOISE DENSITY vs. FREQUENCY (AV = +1) MAX4146 VOLTAGE NOISE DENSITY vs. FREQUENCY (AV = +10) VOLTAGE NOISE (nV/√Hz) 100 100 1k 10k 100k 1M 10 1 10 100 10 100 1k 10k 100k 10 1M 100 1k 10k 100k FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) MAX4146 VOLTAGE NOISE DENSITY vs. FREQUENCY (AV = +100) MAX4144 CURRENT NOISE DENSITY vs. FREQUENCY (AV = +2) MAX4145 CURRENT NOISE DENSITY vs. FREQUENCY (AV = +1) 1 1 0.1 100 1k 10k FREQUENCY (Hz) 100k 1M 1M MAX4144/46 TOC41Q 100 CURRENT NOISE (pA/√Hz) CURRENT NOISE (pA/√Hz) 10 MAX4144/4146 TOC-40 10 MAX4144/4146-39 100 3.5 MAX4144/46-TOC38 1000 1 10 3RD HARMONIC OUTPUT SWING (Vp-p) 10 10 2ND HARMONIC -40 -70 4.0 MAX4144/4146-36 VOLTAGE NOISE (nV/√Hz) -60 -20 OUTPUT SWING (Vp-p) 100 8 -50 -10 VOLTAGE NOISE (nV/√Hz) 0.5 2ND HARMONIC MAX4144/46 TOC-37 -50 -40 0 MAX4144/46 TOC35 -20 -40 MAX4144/4146 TOC-34 -10 DISTORTION (dBc) DISTORTION (dBc) 0 MAX4145 0 -10 MAX4146 5MHz HARMONIC DISTORTION vs. OUTPUT SWING (AV = +100) DISTORTION (dBc) MAX4145 5MHz HARMONIC DISTORTION vs. OUTPUT SWING (AV = +1) VOLTAGE NOISE (nV/√Hz) MAX4144/MAX4145/MAX4146 High-Speed, Low-Distortion, Differential Line Receivers 10 1 10 100 1k 10k FREQUENCY (Hz) 100k 1M 10 100 1k 10k FREQUENCY (Hz) _______________________________________________________________________________________ 100k 1M High-Speed, Low-Distortion, Differential Line Receivers (VCC = +5V, VEE = -5V, SHDN = 0V, RL = 150Ω, TA = +25°C, unless otherwise noted.) MAX4146 CURRENT NOISE DENSITY vs. FREQUENCY (AV = +100) 125 MAX4144/46 TOC41 10 CURRENT NOISE (pA/√Hz) 115 105 95 PSR (dB) MAX4144/46 TOC41R 1 1 85 75 65 55 45 35 25 100k 0.1 0.1 100 1k 10k 100k 10 1M 100 1k 10k 100k 1M 90 100 90 80 70 70 CMR (dB) 80 60 50 60 50 40 40 30 30 20 VCM = 100mVRMS 1M MAX4144/46 TOC44 110 MAX4144/6 TOC-43 110 100k 100M MAX4145 COMMON-MODE REJECTION vs. FREQUENCY (AV = +2) 100 VCM = 100mVRMS 10 10M 100M 100k 1M 10M 100M FREQUENCY (Hz) FREQUENCY (Hz) MAX4146 COMMON-MODE REJECTION vs. FREQUENCY (AV = +10) SHUTDOWN RESPONSE TIME MAX4144/6 TOC-45 MAX4144/6 TOC-45 110 100 90 SHDN 80 VOLTAGE 70 GND (2.5V/div) 10 10M FREQUENCY (Hz) MAX4144 COMMON-MODE REJECTION vs. FREQUENCY (AV = +1) 20 1M FREQUENCY (Hz) FREQUENCY (Hz) CMR (dB) 60 50 40 OUT 30 20 VCM = 100mVRMS 10 100k 1M GND (1.V/div) 10 CMR (dB) CURRENT NOISE (pA/√Hz) 10 POWER-SUPPLY REJECTION vs. FREQUENCY MAX4144/4146-42 MAX4146 CURRENT NOISE DENSITY vs. FREQUENCY (AV = +10) 10M 100M TIME (20µs/div) FREQUENCY (Hz) _______________________________________________________________________________________ 9 MAX4144/MAX4145/MAX4146 _____________________________Typical Operating Characteristics (continued) MAX4144/MAX4145/MAX4146 High-Speed, Low-Distortion, Differential Line Receivers Pin Description PIN MAX4144 MAX4145 MAX4146 NAME FUNCTION 14 SO 16 QSOP 14 SO 16 QSOP 14 SO 16 QSOP 1, 7 1, 7 1, 7 1, 7 1, 7 1, 7 VEE Negative Power Supply 2 2 2 2 2 2 IN- Inverting Input 3, 5, 10, 12 3, 5, 8, 9, 12,14 10, 12 12, 14 10, 12 12, 14 N.C. No Connect. Not internally connected. — — 3 3 3 3 RG- Inverting Input for Gain-Set Resistor 4 4 4 4 4 4 SHDN — — 5 5 5 5 RG+ Noninverting Input for Gain-Set Resistor 6 6 6 6 6 6 IN+ Noninverting Input 8, 14 10, 16 8, 14 10, 16 8, 14 10, 16 VCC Positive Power Supply 9 11 9 11 9 11 REF Output Reference. Connect to ground for normal operation. 11 13 11 13 11 13 OUT Output 13 15 13 15 13 15 SENSE ________________Detailed Description The MAX4144/MAX4145/MAX4146 are low-distortion, differential line receivers that feature high bandwidths and excellent common-mode rejection, making them ideal for balanced, high-speed data transmission systems. The MAX4144 has a preset gain of +2V/V and achieves a 130MHz -3dB bandwidth, a 1000V/µs slew rate, and common-mode rejection (CMR) of 70dB at 10MHz. The MAX4145 and MAX4146 use a single external resistor to set the closed-loop gain from +1V/V to +10V/V for the MAX4145, or greater than +10V/V for the MAX4146. The MAX4145 achieves a -3dB bandwidth of 180MHz, a slew rate of 600V/µs, and CMR of 75dB at 10MHz when operating in the unity-gain configuration. The MAX4146 attains a -3dB bandwidth of 70MHz, a slew rate of 800V/µs, and CMR of 90dB at 10MHz when operating with a closed-loop gain of +10V/V. Differential inputs make the MAX4144/MAX4145/ MAX4146 ideal for applications with high common10 Logic Input for Shutdown Circuitry. A logic low enables the amplifier. A logic high disables the amplifier. Output Sense. Connect to OUT close to the pin for normal operation. mode noise, such as receiving T1 or xDSL transmissions over a twisted-pair cable. Excellent differential gain and phase, along with low noise, also suit them to video applications and RF signal processing. For a complete differential transmission link, use the MAX4144/MAX4145/MAX4146 amplifiers with the MAX4147 line driver, as shown in the Typical Application Circuit. ___________Applications Information Grounding, Bypassing, and PC Board Layout Adhere to the following high-frequency design techniques when designing the PC board for the MAX4144/MAX4145/MAX4146. • The printed circuit board should have at least two layers: the signal layer and the ground plane. • Do not use wire-wrap boards—they are too inductive. ______________________________________________________________________________________ High-Speed, Low-Distortion, Differential Line Receivers Output Short-Circuit Protection Under short-circuit conditions to ground, limit the output current to 120mA. This level is low enough that a short to ground of moderate duration will not cause permanent damage to the chip. However, a short to either supply will significantly increase power dissipation, and will cause permanent damage. The high output current capability is an advantage in systems that transmit a signal to several loads. Input Protection Circuitry The MAX4144/MAX4145/MAX4146 include internal protection circuitry that prevents damage to the precision input stage from large differential input voltages. This protection circuitry consists of five back-to-back Schottky protection diodes between IN+ and RG+, and IN- and RG- (Figure 1). The diodes limit the differential voltage applied to the amplifiers’ internal circuitry to no more than 10VF, where VF is the diode’s forward voltage drop (about 0.4V at +25°C). IN- For a large differential input voltage (exceeding 4V), the MAX4145/MAX4146 input bias current (at IN+ and IN-) increases according to the following equation: Input Current = (V IN+ - VIN- - 10VF ) RG The MAX4144 has an internal gain-setting resistor valued at 1.4kΩ. A differential input voltage as high as 10V will cause only 4.3mA to flow—much less than the 10mA absolute maximum rating. However, in the MAX4145/MAX4146, RG can be as low as 150Ω. Under this condition, the absolute maximum input current rating might be exceeded if the differential input voltage exceeds 5.5V (10mA x 150Ω + 10VF). In that case, 510Ω resistors can be placed at IN+ and IN- to limit the current without degrading performance. Shutdown Mode The MAX4144/MAX4145/MAX4146 can be put into lowpower shutdown mode by bringing SHDN high. The amplifier output is high impedance in this mode; thus the impedance at OUT is that of the feedback resistors (1.4kΩ). Setting Gain (MAX4145/MAX4146) The MAX4145/MAX4146 ’s gain is determined by a single external resistor, RG. The optimal gain range is from +1V/V to +10V/V for the MAX4145 and +10V/V (RG = open) to +100V/V for the MAX4146. The gain (in V/V) is given in the following equations: IN- RG1.4k MAX4144 RG+ MAX4145 MAX4146 IN+ IN+ Figure 1. Input Protection Circuits ______________________________________________________________________________________ 11 MAX4144/MAX4145/MAX4146 • Do not use IC sockets—they increase parasitic capacitance and inductance. • Use surface-mount power-supply bypass capacitors instead of through-hole capacitors. Their shorter lead lengths reduce parasitic inductance, leading to superior high-frequency performance. • Keep signal lines as short and as straight as possible. Do not make 90° turns; round all corners. • The ground plane should be as free from voids as possible. SENSE IN+ RL OUT RG MAX4145 MAX4146 REF IN- Figure 2. Connection of RG in MAX4146 MAX4144 MAX4145 MAX4146 Figure 3. Connection of SENSE and REF to a Remote Load G = AV = 1 + G = A V = 10 + 1.4kΩ (MAX4145) RG 14kΩ (MAX4146) RG Figure 2 shows the connection for RG. RG might simply be a resistor, or it can be a complex pole-zero pair for filter and shaping applications (Figure 9). Use surfacemount gain-setting components to ensure stability. Using REF and SENSE The MAX4144/MAX4145/MAX4146 have a REF pin (normally connected to ground) and a SENSE pin (normally connected to OUT). In some long-line applications, it may be desirable to connect SENSE and OUT together at the load, instead of the typical connection at the part (Figure 3). This compensates for the long line’s resistance, which otherwise leads to an IR voltage error. When using this technique, keep the sense lines’ impedance low to minimize gain errors. Also, keep capacitance low to maximize frequency response. The gain of the MAX4144/MAX4145/MAX4146 output stage is approximated by the following equation: AV = Additionally, mismatches in the SENSE and REF traces lead to common-mode gain errors. Common-mode gain is approximated by the following equation: Substituting numbers for ∆RREF and ∆RSENSE into this equation, we can see that if changes in ∆RREF and ∆RSENSE are equal, CMR is not degraded. Driving Capacitive Loads The MAX4144/MAX4145/MAX4146 provide maximum AC performance when not driving an output load capacitance. This is the case when driving a correctly terminated transmission line (i.e., a back-terminated cable). In most amplifier circuits, driving large load capacitance increases the chance of oscillations. The amplifier’s output impedance and the load capacitor combine to add a pole and excess phase to the loop response. If the pole’s frequency is low enough and phase margin is degraded sufficiently, oscillations may occur. A second concern when driving capacitive loads results from the amplifier’s output impedance, 5 1 700Ω + ∆RSENSE 700Ω + ∆RREF 1 + R + 700Ω + ∆RREF 2 R 700Ω + ∆RREF + R + 700Ω + ∆RREF where ∆RSENSE and ∆RREF are the SENSE and REF trace impedances, respectively. R is 700Ω for the MAX4144 and MAX4145, and 100Ω for the MAX4146. ∆RREF - ∆RSENSE R + 700Ω AVCM = 4 3 2 GAIN (dB) MAX4144/MAX4145/MAX4146 High-Speed, Low-Distortion, Differential Line Receivers CL = 15pF 1 0 CL = 5pF -1 CL = 10pF -2 -3 -4 -5 100k 1M 10M 100M 1G FREQUENCY (Hz) Figure 4. MAX4144 Small-Signal Response with Capacitive Load 12 ______________________________________________________________________________________ High-Speed, Low-Distortion, Differential Line Receivers tive values, bandwidth is dominated by the RC network formed by RISO and CL; the bandwidth of the amplifier itself is much higher. Also note that the isolation resistor forms a divider that decreases the voltage delivered to the load. Twisted-Pair Line Receiver The MAX4144/MAX4145/MAX4146 are well suited as receivers in twisted-pair xDSL or NTSC/PAL video applications. The standard 24AWG telephone wire widely used in these applications is a lossy medium for high-frequency signals. The losses in NTSC video applications are almost 15dB per 1000 feet (Figure 8). 30 OUT RISO RLOAD CLOAD MAX4144 MAX4145 MAX4146 ISOLATION RESISTANCE (Ω) 25 20 15 10 5 0 0 50 100 150 200 250 CAPACITIVE LOAD (pF) Figure 6. MAX4144 Isolation Resistance vs. Capacitve Load Figure 5. Addition of RISO to Amplifier Output 20 15 AV = 10V/V 10 5 16 0 14 GAIN (dB) ISOLATION RESISTANCE (Ω) 18 12 10 -5 -10 -15 -20 8 -25 6 -30 4 -35 0 50 100 150 200 250 CAPACITIVE LOAD (pF) Figure 7. MAX4145/MAX4146 Isolation Resistance vs. Capacitive Load 10k 100k 1M 10M FREQUENCY (Hz) Figure 8. 1000 Feet of AWG24 Twisted-Pair Telephone Cable (Gain vs. Frequency) ______________________________________________________________________________________ 13 MAX4144/MAX4145/MAX4146 which appears inductive at high frequencies. This inductance forms an L-C resonant circuit with the capacitive load, which causes peaking in the frequency response and degrades the amplifier’s phase margin. The MAX4144/MAX4145/MAX4146 drive capacitive loads up to 25pF without oscillation. However, some peaking may occur in the frequency domain (Figure 4). To drive larger capacitance and reduce ringing, add an isolation resistor (RISO) between the amplifier’s output and the load (Figure 5). The value of RISO depends on the circuit’s gain and the capacitive load (Figures 6 and 7). With higher capaci- MAX4144/MAX4145/MAX4146 High-Speed, Low-Distortion, Differential Line Receivers Losses are higher at higher frequencies, contributing to severe pulse-edge rounding in digital applications. The nominal impedance of twisted-pair telephone wire is 110Ω. The MAX4145/MAX4146, with variable gain up to +10V/V and +100V/V, respectively, can be used to compensate for cable losses. In the graph shown in Figure 8, the cable characteristics are such that the video-chroma frequency loss is almost 15dB greater than the low-frequency loss. The losses can be compensated for by using the RC-shaping network (Figure 9). A 560Ω resistance and a 100pF capacitance shape the MAX4146 gain to inversely match the frequency of the 1000 feet of telephone cable. The differential gain and phase, using the circuit shown in Figure 9, is 0.55% and 0.18°, respectively. VCC VCC 1000 FEET 0.1µF 8, 14 12 75Ω 13 100pF 110Ω MAX4147ESD 8, 14 2 3 13 2 VIDEO INPUT 0.1µF 75Ω MAX4146ESD 560Ω 10 6 1, 7 75Ω VIDEO OUTPUT 9 5 6 9 11 1, 7 0.1µF VEE 0.1µF VEE Figure 9. Circuit for Transmitting NTSC/PAL Video Over 1000 Feet of Twisted-Pair Telephone Line __________________________________________________Typical Application Circuit IN+ RT RT SENSE+ SENSE IN75Ω OUT+ MAX4147 IN- OUT- IN+ RT MAX4144 75Ω COAX VOUT OUT REF SENSERT TWISTED-PAIR-TO-COAX CABLE CONVERTER 14 ______________________________________________________________________________________ 75Ω High-Speed, Low-Distortion, Differential Line Receivers TOP VIEW MAX4144 VEE 1 R SHDN 4 RF RG RF VEE 1 13 SENSE IN- 2 12 N.C. RG- 3 11 OUT SHDN 4 MAX4145 MAX4146 RSENSE IN- 2 N.C. 3 14 VCC R R 10 N.C. RSENSE 13 SENSE 12 N.C. RF 11 OUT RF N.C. 5 14 VCC R 10 N.C. RG+ 5 RREF RREF IN+ 6 9 REF IN+ 6 9 REF VEE 7 8 VCC VEE 7 8 VCC SO SO MAX4144 VEE 1 R SHDN 4 RF RG RF VEE 1 15 SENSE IN- 2 14 N.C. RG- 3 13 OUT SHDN 4 12 N.C. RG+ 5 MAX4145 MAX4146 RSENSE IN- 2 N.C. 3 16 VCC R R RSENSE 15 SENSE 14 N.C. RF 13 OUT RF N.C. 5 16 VCC R 12 N.C. RREF RREF IN+ 6 11 REF IN+ 6 11 REF VEE 7 10 VCC VEE 7 10 VCC N.C N.C. 8 N.C. 8 9 QSOP 9 N.C. QSOP ___________________Chip Information TRANSISTOR COUNT: 237 SUBSTRATE CONNECTED TO VEE ______________________________________________________________________________________ 15 MAX4144/MAX4145/MAX4146 Pin Configurations QSOP.EPS ________________________________________________________Package Information SOICN.EPS MAX4144/MAX4145/MAX4146 High-Speed, Low-Distortion, Differential Line Receivers Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.