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19-1147; Rev 1; 1/98
KIT ATION EVALU LE B AVAILA
High-Speed, Low-Distortion, Differential Line Receivers
____________________________Features
MAX4144: o +2V/V Internally Fixed Gain o 130MHz Bandwidth o 1000V/s Slew Rate o 70dB CMR at 10MHz o -90dBc SFDR (f = 10kHz) o Low Differential Gain/Phase: 0.03%/0.03 o 800A Shutdown MAX4145: o External Gain Selection from +1V/V to +10V/V o 180MHz Bandwidth o 90MHz 0.1dB Gain Flatness o 600V/s Slew Rate o 75dB CMR at 10MHz o -92dBc SFDR (f = 10kHz) o Very Low Noise: 3.8nV/Hz (G = +10V/V) o 800A Shutdown MAX4146: o External Gain Selection from +10V/V to +100V/V o 70MHz Bandwidth (AV = +10V/V) o 800V/s Slew Rate o 90dB CMR at 10MHz o -82dBc SFDR (f = 10kHz) o Very Low Noise: 3.45nV/Hz (G = +100V/V) o 800A Shutdown
________________General Description
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 150 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. 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/s slew rate. The MAX4145 achieves a bandwidth of 180MHz and a slew rate of 600V/s while operating with a closed-loop gain of +1V/V, and the MAX4146 features a bandwidth of 70MHz and a slew rate of 800V/s 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. 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).
MAX4144/MAX4145/MAX4146
________________________Applications
Differential to Single-Ended Conversion Twisted-Pair to Coaxial Converter High-Speed Instrumentation Amplifier Data Acquisition Medical Instrumentation High-Speed Differential Line Receiver
_______________Ordering Information
PART MAX4144ESD MAX4144EEE MAX4145ESD MAX4145EEE TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 14 SO 16 QSOP 14 SO 16 QSOP 14 SO 16 QSOP
Pin Configurations appear at end of data sheet. Typical Application Circuit appears at end of data sheet.
MAX4146ESD MAX4146EEE
________________________________________________________________ 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.
High-Speed, Low-Distortion, Differential Line Receivers MAX4144/MAX4145/MAX4146
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 = +70C) 14-Pin SO (derate 8.33mW/C above +70C)..............667mW 16-Pin QSOP (derate 8.33mW/C above +70C).........667mW Operating Temperature Range ...........................-40C to +85C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10sec) .............................+300C
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 = +25C.) PARAMETER Operating Supply Voltage Input Offset Voltage Input Offset Voltage Drift Input Bias Current Input Offset Current Input Capacitance Differential Input Resistance Differential Input Voltage Range Common-Mode Input Voltage Range Gain VOS TCVOS IB IOS CIN RIN MAX4144 RL = 150 MAX4145 MAX4146 VCM Guaranteed by CMR test -1V VOUT +1V, RL = 150 MAX4144 Gain Error -1V VOUT +1V, RL = 150 MAX4145 MAX4146 -1V VOUT +1V, RL = 150 CMR PSR ISHDN VCM = 2.8V VS = 4.5V to 5.5V VSHDN 2V MAX4144 Shutdown Output Impedance VSHDN 2V RL = 100 Output Voltage Swing VOUT RL = 150 RL = 2 3.1 3.4 MAX4145 MAX4146 MAX4144 MAX4145 MAX4146 AV = 2V/V AV = 1V/V AV = 10V/V AV = 10V/V AV = 100V/V MAX4144 MAX4145 MAX4146 60 70 -1.55 -2.8/G -3.1/G -2.8 2 1 + (1.4k/RG) 10 + (14k/RG) 0.02 0.5 1.5 0.5 1.5 20 5 + 15G 14 + 0.9G 80 85 11 0.8 1.4 1.4 2 3.6 3.7 3.8 V k 16 2 dB dB mA mA ppm/C 2 2 5 2 5 % V/V SYMBOL VIN = 0V VIN = 0V VIN = 0V VIN = 0V CONDITIONS Guaranteed by PSR test MIN 4.5 0.6 5 9 0.1 1 1 1.55 2.8/G 3.1/G 2.8 V V 20 2.5 TYP MAX 5.5 8 UNITS V mV V/C A A pF M
AV
Gain Drift Common-Mode Rejection Power-Supply Rejection Quiescent Supply Current Shutdown Supply Current
_______________________________________________________________________________________
High-Speed, Low-Distortion, Differential Line Receivers
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V, VEE = -5V, SHDN = 0V, RL = , TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER Output Current Drive SHDN High Threshold SHDN Low Threshold SHDN Input Bias Current SYMBOL IOUT VIH VIL ISHDN VSHDN 0.8V VSHDN 2V 0.8 75 0.06 150 2 VOUT = 1.7V CONDITIONS 0C TA +85C -40C TA 0C MIN 80 60 2 TYP 100 MAX UNITS mA V V A
MAX4144/MAX4145/MAX4146
AC ELECTRICAL CHARACTERISTICS
(VCC = +5V, VEE = -5V, SHDN = 0V, RL = 150, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SYMBOL VOUT 0.1VRMS CONDITIONS MAX4144 -3dB Bandwidth BW(-3dB) MAX4145 MAX4146 MAX4144 Full-Power Bandwidth FPBW VOUT = 2Vp-p MAX4145 MAX4146 VOUT 0.1VRMS MAX4144 MAX4145 MAX4146 MAX4144 Input Voltage Noise Density Input Current Noise Density Common-Mode Rejection en in CMR f = 1MHz f = 1MHz MAX4144 f = 10MHz MAX4145 MAX4146 MAX4144 Slew Rate SR -2V VOUT +2V MAX4145 MAX4146 MAX4144 to 0.1% Settling Time to 0.1% tS -2V VOUT +2V to 0.01% Enable Time from Shutdown Disable Time to Shutdown MAX4144 Differential Gain (Note 1) DG f = 3.58MHz MAX4145 MAX4146 MAX4145 MAX4146 MAX4144 MAX4145 MAX4146 MAX4145 MAX4146 AV = 2V/V AV = 1V/V AV = 10V/V AV = 100V/V AV = 2V/V AV = 1V/V AV = 10V/V AV = 100V/V AV = 2V/V AV = 1V/V AV = 10V/V MIN TYP 130 180 70 30 110 180 70 30 30 90 50 12 1.8 + (20/G) 2.1 + (135/G) 1.7 70 75 90 1000 600 800 23 20 17 36 38 40 45 40 0.03 0.01 0.12 3 % ns s ns V/s dB pA/Hz nV/Hz MHz MHz MHz MAX UNITS
0.1dB Bandwidth
BW(0.1dB)
_______________________________________________________________________________________
High-Speed, Low-Distortion, Differential Line Receivers MAX4144/MAX4145/MAX4146
AC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V, VEE = -5V, SHDN = 0V, RL = 150, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER Differential Phase (Note 1) SYMBOL DP f = 3.58MHz CONDITIONS MAX4144 MAX4145 MAX4146 MAX4144 f = 10kHz, MAX4145 VOUT = 2Vp-p MAX4146 MAX4144 f = 5MHz, MAX4145 VOUT = 2Vp-p MAX4146 AV = 2V/V AV = 1V/V AV = 10V/V AV = 2V/V AV = 1V/V AV = 10V/V MIN TYP 0.03 0.06 0.07 -90 -92 -82 -66 -67 -48 dBc Degrees MAX UNITS
Spurious-Free Dynamic Range
SFDR
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 = 150, TA = +25C, unless otherwise noted.)
MAX4144 SMALL-SIGNAL GAIN vs. FREQUENCY (AV = +2)
MAX4144/6 TOC-01
MAX4145 SMALL-SIGNAL GAIN vs. FREQUENCY (AV = +1)
MAX4144/6 TOC-02
MAX4146 SMALL-SIGNAL GAIN vs. FREQUENCY (AV = +10)
4 3 NORMALIZED GAIN (dB) 2 1 0 -1 -2 -3 -4 -5 VOUT = 100mVRMS
MAX4144/6 TOC-03
5 4 3 NORMALIZED GAIN (dB) 2 VOUT = 100mVRMS
4 3 2 1 GAIN (dB) 0 -1 -2 -3 -4 -5 -6 VOUT = 100mVRMS
5
1 0 -1 -2 -3 -4 -5 100k 1M 10M FREQUENCY (Hz) 100M 1G
100k
1M
10M FREQUENCY (Hz)
100M
1G
100k
1M
10M FREQUENCY (Hz)
100M
1G
MAX4146 SMALL-SIGNAL GAIN vs. FREQUENCY (AV = +100)
MAX4144/4146-04
MAX4144 0.1dB GAIN FLATNESS vs. FREQUENCY (AV = +2)
MAX444/46 TOC05
MAX4145 0.1dB GAIN FLATNESS vs. FREQUENCY (AV = +1)
0.4 0.3 NORMAILIZED GAIN (dB) 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 VOUT = 100mVRMS
MAX4144/46 TOC06a
5 4 3 NORMALIZED GAIN (dB) 2 1 0 -1 -2 -3 -4 -5
0.5 0.4 0.3 NORMALIZED GAIN (dB) 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 VOUT = 100mVRMS
VOUT = 100mVRMS
0.5
100k
1M
10M FREQUENCY (Hz)
100M
1G
100k
1M
10M FREQUENCY (Hz)
100M
1G
-0.5 100k 1M 10M FREQUENCY (Hz) 100M 1G
4
_______________________________________________________________________________________
High-Speed, Low-Distortion, Differential Line Receivers
_____________________________Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, SHDN = 0V, RL = 150, TA = +25C, unless otherwise noted.)
MAX4146 0.1dB GAIN FLATNESS vs. FREQUENCY (AV = +10)
MAX4144/46 TOC06
MAX4144/MAX4145/MAX4146
MAX4144 LARGE-SIGNAL GAIN vs. FREQUENCY (AV = +2)
MAX4144/4146-07
MAX4145 LARGE-SIGNAL GAIN vs. FREQUENCY (AV = +1)
3 2 NORMALIZED GAIN (dB) 1 0 -1 -2 -3 -4 -5 -6 VOUT = 2Vp-p
MAX4144/46 TOC-8
0.5 0.4 0.3 NORMALIZED GAIN (dB) 0.2 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 100k 1M 10M FREQUENCY (Hz) 100M VOUT = 100mVRMS
5 4 3 NORMALIZED GAIN (dB) 2 1 0 -1 -2 -3 -4 -5
4
VOUT = 2Vp-p
1G
100k
1M
10M FREQUENCY (Hz)
100M
1G
100k
1M
10M FREQUENCY (Hz)
100M
1G
MAX4146 SMALL-SIGNAL GAIN vs. FREQUENCY (AV = +10)
4 3 NORMALIZED GAIN (dB) 2 1 0 -1 -2 -3 -4 -5 100k 1M 10M FREQUENCY (Hz) 100M 1G VOUT = 100mVRMS
MAX4144/6 TOC-09
MAX4146 LARGE-SIGNAL GAIN vs. FREQUENCY (AV = +100)
2 1 NORMALIZED GAIN (dB) 0 -1 -2 -3 -4 -5 -6 -7 100k 1M 10M FREQUENCY (Hz) 100M 1G VOUT = 2Vp-p
MAX4144/4146-10
MAX4144 SMALL-SIGNAL PULSE RESPONSE (AV = +2)
TOC-11
5
3
IN VOLTAGE (20mV/div)
GND
OUT
GND
TIME (10ns/div)
MAX4145 SMALL-SIGNAL PULSE RESPONSE (AV = +1)
MAX4144/4146 TOC12
TOC-13
VOLTAGE (50mV/div)
VOLTAGE (20mV/div)
VOLTAGE
OUT 20mV/div GND
OUT
GND
OUT
GND
1mV/div
IN
GND
IN
GND
IN
TIME (10ns/div)
TIME (10ns/div)
TIME (10ns/div)
_______________________________________________________________________________________
TOC-14
MAX4146 SMALL-SIGNAL PULSE RESPONSE (AV = +10)
MAX4146 SMALL-SIGNAL PULSE RESPONSE (AV = +100)
GND
5
High-Speed, Low-Distortion, Differential Line Receivers MAX4144/MAX4145/MAX4146
_____________________________Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, SHDN = 0V, RL = 150, TA = +25C, unless otherwise noted.)
MAX4144 LARGE-SIGNAL PULSE RESPONSE (AV = +2)
TOC-15
MAX4145 LARGE-SIGNAL PULSE RESPONSE (AV = +1)
IN VOLTAGE (500mV/div)
GND VOLTAGE (1V/div)
IN
GND
VOLTAGE (500mV/div)
IN
OUT
GND
OUT
OUT
GND
TIME (10ns/div)
TIME (10ns/div)
TIME (10ns/div)
MAX4146 LARGE-SIGNAL PULSE RESPONSE (AV = +100)
TOC-18
CLOSED-LOOP OUTPUT IMPEDANCE vs. FREQUENCY (AV = +1)
CLOSED-LOOP OUTPUT IMPEDANCE ()
MAXXXXXX
MAX4144 DIFFERENTIAL GAIN AND PHASE
0.01 0 -0.01 -0.02 -0.03 -0.04 0 IRE 0.04 0.03 0.02 0.01 0 -0.01 0 IRE PHASE (deg) AV = 2V/V GAIN (%)
MAX4144/6 TOC-20
100
GND
IN (20mV/div)
10
AV = 2V/V 100
VOLTAGE
OUT GND (500mV/div)
1
0.1
0.01
TIME (10ns/div)
100k
1M
10M FREQUENCY (Hz)
100M
1G
100
MAX4145 DIFFERENTIAL GAIN AND PHASE
0.05 0 -0.05 -0.10 -0.15 -0.20 0 IRE 0.08 0.06 0.04 0.02 0 -0.02 0 IRE PHASE (deg) PHASE (deg)
MAX4144/6 TOC-21
MAX4146 DIFFERENTIAL GAIN AND PHASE
MAX4144/6 TOC-22
OUTPUT SWING vs. LOAD RESISTANCE
MAX4144/4146-23
0.05 GAIN (%) 0 -0.05 -0.10 AV = 10V/V
9.0 8.0 OUTPUT SWING (Vp-p) 7.0 6.0 5.0 4.0
GAIN (%)
AV = 1V/V 100
-0.15 0 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.10 0
100 IRE
AV = 1V/V 100
AV = 10V/V 3.0 100 IRE 0 50 100 150 200 250 LOAD ()
6
_______________________________________________________________________________________
TOC-17
MAX4144/46 TOC16
MAX4146 LARGE-SIGNAL PULSE RESPONSE (AV = +10)
GND
GND
High-Speed, Low-Distortion, Differential Line Receivers
_____________________________Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, SHDN = 0V, RL = 150, TA = +25C, unless otherwise noted.)
MAX4144 HARMONIC DISTORTION vs. FREQUENCY (AV = +2)
MAX4144/46/ TOC-24
MAX4144/MAX4145/MAX4146
MAX4145 HARMONIC DISTORTION vs. FREQUENCY (AV = +1)
-10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 2ND HARMONIC VOUT = 2Vp-p
MAX4144/46 TOC25
MAX4146 HARMONIC DISTORTION vs. FREQUENCY (AV = +10)
-10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 3RD HARMONIC 2ND HARMONIC VOUT = 2Vp-p
MAX4144/4146 TOC-26
0 -10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 -80 -90 -100 100k 1M 10M 2ND HARMONIC 3RD HARMONIC VOUT = 2Vp-p
0
0
-80 -90 -100 100M 100k 1M
3RD HARMONIC
-80 -90 -100
10M
100M
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
MAX4146 HARMONIC DISTORTION vs. FREQUENCY (AV = +100)
MAX4144/4146 TOC-27
MAX4144 5MHz HARMONIC DISTORTION vs. LOAD (AV = +2)
MAX4144/4146-26
MAX4145 5MHz HARMONIC DISTORTION vs. LOAD (AV = +1)
-10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 -80 -90 -100 2ND HARMONIC 3RD HARMONIC VOUT = 2Vp-p
MAX4145
0 -10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 -80 -90 -100 100k 1M 10M 3RD HARMONIC 2ND HARMONIC VOUT = 2Vp-p
0 -10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 -80 -90 -100 3RD HARMONIC 2ND HARMONIC VOUT = 2Vp-p
0
100M
0
200
400
600
800
1k
0
200
400
600
800
1k
FREQUENCY (Hz)
LOAD ()
LOAD ()
MAX4146 5MHz HARMONIC DISTORTION vs. LOAD (AV = +10)
MAX4144/4146-30
MAX4146 5MHz HARMONIC DISTORTION vs. LOAD (AV = +100)
MAX4144/4146-31
MAX4144 5MHz HARMONIC DISTORTION vs. OUTPUT SWING (AV = +2)
-10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 -80 -90 -100 2ND HARMONIC 3RD HARMONIC
MAX4144/46 TOC-32
0 -10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 -80 -90 -100 0 200 400 600 800 3RD HARMONIC 2ND HARMONIC VOUT = 2Vp-p
0 -10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 -80 -90 -100 3RD HARMONIC 2ND HARMONIC VOUT = 2Vp-p
0
1k
0
200
400
600
800
1k
0.5
1.0
1.5
2.0
2.5
3.0
3.5
LOAD ()
LOAD ()
VOLTAGE SWING (Vp-p)
_______________________________________________________________________________________
7
High-Speed, Low-Distortion, Differential Line Receivers MAX4144/MAX4145/MAX4146
_____________________________Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, SHDN = 0V, RL = 150, TA = +25C, unless otherwise noted.)
MAX4145 5MHz HARMONIC DISTORTION vs. OUTPUT SWING (AV = +1)
MAX4145
MAX4146 5MHz HARMONIC DISTORTION vs. OUTPUT SWING (AV = +10)
MAX4144/4146 TOC-34
MAX4146 5MHz HARMONIC DISTORTION vs. OUTPUT SWING (AV = +100)
-10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 -80 -90 -100 3RD HARMONIC 2ND HARMONIC
MAX4144/46 TOC35
0 -10 -20 DISTORTION (dBc)
0 -10 -20 DISTORTION (dBc) -30 -40 -50 -60 -70 -80 2ND HARMONIC
0
-30 -40 -50 -60 -70 -80 -90 -100 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 OUTPUT SWING (Vp-p) 3RD HARMONIC 2ND HARMONIC
3RD HARMONIC
-90 -100 0.5 1.0 1.5 2.0 2.5 3.0 3.5 OUTPUT SWING (Vp-p)
0.5
1.0
1.5
2.0
2.5
3.0
3.5
OUTPUT SWING (Vp-p)
MAX4144 VOLTAGE NOISE DENSITY vs. FREQUENCY (AV = +2)
MAX4144/4146-36
MAX4145 VOLTAGE NOISE DENSITY vs. FREQUENCY (AV = +1)
MAX4144/46 TOC-37
MAX4146 VOLTAGE NOISE DENSITY vs. FREQUENCY (AV = +10)
MAX4144/46-TOC38
100
1000
100
VOLTAGE NOISE (nV/Hz)
10
100
VOLTAGE NOISE (nV/Hz)
VOLTAGE NOISE (nV/Hz)
10
1 10 100 1k 10k 100k 1M FREQUENCY (Hz)
10 10 100 1k 10k 100k 1M FREQUENCY (Hz)
1 10 100 1k 10k 100k 1M FREQUENCY (Hz)
MAX4146 VOLTAGE NOISE DENSITY vs. FREQUENCY (AV = +100)
MAX4144/4146-39
MAX4144 CURRENT NOISE DENSITY vs. FREQUENCY (AV = +2)
MAX4144/4146 TOC-40
MAX4145 CURRENT NOISE DENSITY vs. FREQUENCY (AV = +1)
MAX4144/46 TOC41Q
100
10
100
VOLTAGE NOISE (nV/Hz)
CURRENT NOISE (pA/Hz)
10
1
CURRENT NOISE (pA/Hz)
10
1 10 100 1k 10k 100k 1M FREQUENCY (Hz)
0.1 10 100 1k 10k 100k 1M FREQUENCY (Hz)
1 10 100 1k 10k 100k 1M FREQUENCY (Hz)
8
_______________________________________________________________________________________
High-Speed, Low-Distortion, Differential Line Receivers
_____________________________Typical Operating Characteristics (continued)
(VCC = +5V, VEE = -5V, SHDN = 0V, RL = 150, TA = +25C, unless otherwise noted.)
MAX4146 CURRENT NOISE DENSITY vs. FREQUENCY (AV = +10)
MAX4144/46 TOC41R
MAX4144/MAX4145/MAX4146
MAX4146 CURRENT NOISE DENSITY vs. FREQUENCY (AV = +100)
MAX4144/46 TOC41
POWER-SUPPLY REJECTION vs. FREQUENCY
115 105 95 PSR (dB) 85 75 65 55 45 35
MAX4144/4146-42
10
10
125
CURRENT NOISE (pA/Hz)
CURRENT NOISE (pA/Hz)
1
1
0.1 10 100 1k 10k 100k 1M FREQUENCY (Hz)
0.1 10 100 1k 10k 100k 1M FREQUENCY (Hz)
25 100k
1M
10M
100M
FREQUENCY (Hz)
MAX4144 COMMON-MODE REJECTION vs. FREQUENCY (AV = +1)
MAX4144/6 TOC-43
MAX4145 COMMON-MODE REJECTION vs. FREQUENCY (AV = +2)
100 90 80 CMR (dB) 70 60 50 40 30
MAX4144/46 TOC44
110 100 90 80 CMR (dB) 70 60 50 40 30 20 10 VCM = 100mVRMS 100k 1M 10M 100M
110
20 10
VCM = 100mVRMS 100k 1M 10M 100M
FREQUENCY (Hz)
FREQUENCY (Hz)
MAX4146 COMMON-MODE REJECTION vs. FREQUENCY (AV = +10)
100 90 80 CMR (dB)
MAX4144/6 TOC-45
SHUTDOWN RESPONSE TIME
MAX4144/6 TOC-45
110
SHDN (2.5V/div)
GND
60 50 40 30 20 10 100k VCM = 100mVRMS 1M 10M 100M
VOLTAGE OUT (1.V/div) GND
70
TIME (20s/div)
FREQUENCY (Hz)
_______________________________________________________________________________________
9
High-Speed, Low-Distortion, Differential Line Receivers MAX4144/MAX4145/MAX4146
Pin Description
PIN MAX4144 14 SO 1, 7 2 3, 5, 10, 12 -- 4 -- 6 8, 14 9 11 13 16 QSOP 1, 7 2 3, 5, 8, 9, 12,14 -- 4 -- 6 10, 16 11 13 15 MAX4145 14 SO 1, 7 2 10, 12 3 4 5 6 8, 14 9 11 13 16 QSOP 1, 7 2 12, 14 3 4 5 6 10, 16 11 13 15 MAX4146 14 SO 1, 7 2 10, 12 3 4 5 6 8, 14 9 11 13 16 QSOP 1, 7 2 12, 14 3 4 5 6 10, 16 11 13 15 VEE INN.C. RGSHDN RG+ IN+ VCC REF OUT SENSE Negative Power Supply Inverting Input No Connect. Not internally connected. Inverting Input for Gain-Set Resistor Logic Input for Shutdown Circuitry. A logic low enables the amplifier. A logic high disables the amplifier. Noninverting Input for Gain-Set Resistor Noninverting Input Positive Power Supply Output Reference. Connect to ground for normal operation. Output Output Sense. Connect to OUT close to the pin for normal operation. NAME FUNCTION
________________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/s 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/s, 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/s, 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
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.
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High-Speed, Low-Distortion, Differential Line Receivers
* 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. 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 =
MAX4144/MAX4145/MAX4146
(V
IN+ - VIN- - 10VF
)
RG The MAX4144 has an internal gain-setting resistor valued at 1.4k. 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 150. Under this condition, the absolute maximum input current rating might be exceeded if the differential input voltage exceeds 5.5V (10mA x 150 + 10VF). In that case, 510 resistors can be placed at IN+ and IN- to limit the current without degrading performance.
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.
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 (1.4k).
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 +25C).
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-
IN-
RG1.4k
MAX4144
RG+
MAX4145 MAX4146
IN+
IN+
Figure 1. Input Protection Circuits
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High-Speed, Low-Distortion, Differential Line Receivers MAX4144/MAX4145/MAX4146
SENSE
IN+
OUT
RL
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 +
1.4k (MAX4145) RG 14k (MAX4146) RG
Additionally, mismatches in the SENSE and REF traces lead to common-mode gain errors. Common-mode gain is approximated by the following equation:
AVCM = RREF - RSENSE R + 700
G = A V = 10 +
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.
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 4 3 2 GAIN (dB) 1 0 -1 -2 -3 -4 -5 100k 1M 10M FREQUENCY (Hz) 100M 1G CL = 5pF CL = 10pF CL = 15pF
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 = 1 700 + RSENSE 700 + RREF 1 + R + 700 + RREF 2 R
700 + RREF + R + 700 + RREF
where RSENSE and RREF are the SENSE and REF trace impedances, respectively. R is 700 for the MAX4144 and MAX4145, and 100 for the MAX4146.
Figure 4. MAX4144 Small-Signal Response with Capacitive Load
12 ______________________________________________________________________________________
High-Speed, Low-Distortion, Differential Line Receivers
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 capacitive 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.
MAX4144/MAX4145/MAX4146
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 25 ISOLATION RESISTANCE () 20 15 10 5 0 0 50 100 150 200 250 CAPACITIVE LOAD (pF)
OUT
RISO
MAX4144 MAX4145 MAX4146
CLOAD
RLOAD
Figure 5. Addition of RISO to Amplifier Output
Figure 6. MAX4144 Isolation Resistance vs. Capacitve Load
20 18 ISOLATION RESISTANCE () 16 GAIN (dB) 0 50 100 150 200 250 14 12 10 8 6 4 CAPACITIVE LOAD (pF) AV = 10V/V
15 10 5 0 -5 -10 -15 -20 -25 -30 -35 10k 100k 1M 10M FREQUENCY (Hz)
Figure 7. MAX4145/MAX4146 Isolation Resistance vs. Capacitive Load
Figure 8. 1000 Feet of AWG24 Twisted-Pair Telephone Cable (Gain vs. Frequency)
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13
High-Speed, Low-Distortion, Differential Line Receivers MAX4144/MAX4145/MAX4146
Losses are higher at higher frequencies, contributing to severe pulse-edge rounding in digital applications. The nominal impedance of twisted-pair telephone wire is 110. 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 560 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 1000 FEET 0.1F 8, 14 2 VIDEO INPUT 75 2 3 100pF 110 560 5 6 0.1F VEE
VCC
0.1F 8, 14 13 75 VIDEO OUTPUT
13 12
MAX4147ESD
6 1, 7 75 9 10
MAX4146ESD
9 1, 7
11
0.1F VEE
Figure 9. Circuit for Transmitting NTSC/PAL Video Over 1000 Feet of Twisted-Pair Telephone Line
__________________________________________________Typical Application Circuit
IN+
SENSE+ OUT+
RT
RT SENSE IN75 IN+ 75 COAX VOUT OUT 75
MAX4147
INSENSE-
OUT-
MAX4144
REF
RT
RT
TWISTED-PAIR-TO-COAX CABLE CONVERTER
14
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High-Speed, Low-Distortion, Differential Line Receivers
Pin Configurations
TOP VIEW
MAX4144/MAX4145/MAX4146
VEE 1 IN- 2 N.C. 3 SHDN 4 N.C. 5 RG RF
MAX4144
R RSENSE
14 VCC 13 SENSE 12 N.C. 11 OUT
VEE 1 IN- 2 RG- 3 SHDN 4 RF
MAX4145 MAX4146
R RSENSE
14 VCC 13 SENSE 12 N.C. 11 OUT
RF R
RF
R 10 N.C. RREF 9 8 REF VCC
10 N.C. RREF 9 8 REF VCC
RG+ 5 IN+ 6 VEE 7
IN+ 6 VEE 7
SO
SO
VEE 1 IN- 2 N.C. 3 SHDN 4 N.C. 5 RG RF
MAX4144
R RSENSE
16 VCC 15 SENSE 14 N.C. 13 OUT
VEE 1 IN- 2 RG- 3 SHDN 4 RF
MAX4145 MAX4146
R RSENSE
16 VCC 15 SENSE 14 N.C. 13 OUT
RF R
RF
R 12 N.C. RREF 11 REF 10 VCC 9 N.C.
12 N.C. RREF 11 REF 10 VCC 9 N.C
RG+ 5 IN+ 6 VEE 7 N.C. 8
IN+ 6 VEE 7 N.C. 8
QSOP
QSOP
___________________Chip Information
TRANSISTOR COUNT: 237 SUBSTRATE CONNECTED TO VEE
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15
High-Speed, Low-Distortion, Differential Line Receivers MAX4144/MAX4145/MAX4146
________________________________________________________Package Information
QSOP.EPS
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 (c) 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
SOICN.EPS

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