19-1147; Rev 3; 3/09
KIT
ATION
EVALU
LE
B
A
IL
A
AV
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.
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).
MAX4145:
________________________Applications
o +2V/V Internally Fixed Gain
o 130MHz Bandwidth
o 1000V/μs Slew Rate
o 70dB CMR at 10MHz
o -90dBc SFDR (f = 10kHz)
o Low Differential Gain/Phase: 0.03%/0.03°
o 800μA Shutdown
o External Gain Selection from +1V/V to +10V/V
o 180MHz Bandwidth
o 90MHz 0.1dB Gain Flatness
o 600V/μs Slew Rate
o 75dB CMR at 10MHz
o -92dBc SFDR (f = 10kHz)
o Very Low Noise: 3.8nV/√Hz (G = +10V/V)
o 800μA Shutdown
MAX4146:
o External Gain Selection from +10V/V to +100V/V
o 70MHz Bandwidth (AV = +10V/V)
o 800V/μs Slew Rate
Differential to Single-Ended Conversion
o 90dB CMR at 10MHz
Twisted-Pair to Coaxial Converter
o -82dBc SFDR (f = 10kHz)
High-Speed Instrumentation Amplifier
Data Acquisition
Medical Instrumentation
High-Speed Differential Line Receiver
o Very Low Noise: 3.45nV/√Hz (G = +100V/V)
o 800μA Shutdown
_______________Ordering Information
PART
Pin Configurations appear at end of data sheet.
Typical Application Circuit appears at end of data sheet.
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
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1
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
9
mV
VOS
VIN = 0V
0.6
TCVOS
VIN = 0V
5
IB
VIN = 0V
9
30
µA
Input Offset Current
IOS
VIN = 0V
0.1
3
µA
Input Capacitance
CIN
Differential Input Resistance
RIN
Input Offset Voltage Drift
Input Bias Current
Differential Input Voltage Range
Common-Mode Input Voltage
Range
Gain
1
AV
-1V ≤ VOUT ≤ +1V,
RL = 150Ω
-1V ≤ VOUT
≤ +1V,
RL = 150Ω
MAX4145
MAX4146
-1V ≤ VOUT ≤ +1V,
RL = 150Ω
Gain Drift
-1.55
1.55
MAX4145
-2.8/G
2.8/G
MAX4146
-3.1/G
3.1/G
-2.8
2.8
MAX4144
2
MAX4145
1 + (1.4kΩ/RG)
MAX4146
10 + (14kΩ/RG)
AV = 2V/V
0.02
2
AV = 1V/V
0.5
3
AV = 10V/V
1.5
5
AV = 10V/V
0.5
3
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
MΩ
MAX4144
Guaranteed by CMR test
MAX4144
Gain Error
pF
1
RL = 150Ω
VCM
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
70
100
-40°C ≤ TA ≤ 0°C
40
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
0.1dB Bandwidth
FPBW
BW(0.1dB)
CONDITIONS
VOUT ≤
0.1VRMS
VOUT =
2VP-P
VOUT ≤
0.1VRMS
Input Voltage Noise Density
en
f = 1MHz
Input Current Noise Density
in
f = 1MHz
Common-Mode Rejection
Slew Rate
CMR
SR
tS
TYP
AV = 2V/V
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
MAX4146
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)
1.7
f = 10MHz
-2V ≤ VOUT ≤ +2V
to 0.1%
Settling Time to 0.1%
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
f = 3.58MHz
DP
f = 10kHz,
VOUT = 2VP-P
Spurious-Free Dynamic Range
SFDR
f = 5MHz,
VOUT = 2VP-P
MIN
TYP
MAX4144
0.03
MAX4145
0.06
MAX4146
0.07
MAX4144
AV = 2V/V
-90
MAX4145
AV = 1V/V
-92
MAX4146
AV = 10V/V
-82
MAX4144
AV = 2V/V
-66
MAX4145
AV = 1V/V
-67
MAX4146
AV = 10V/V
-48
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
3
2
1
0
-1
-1
-2
-2
-3
-3
-4
-4
-5
-4
-5
-6
-5
100k
1G
10M
1M
100M
1G
0.1
100
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)
VOUT = 100mVRMS
0.5
2
1
0
-1
-2
VOUT = 100mVRMS
0.4
0.3
NORMALIZED GAIN (dB)
3
0.5
0.2
0.1
0
-0.1
-0.2
0.3
0.1
0
-0.1
-0.2
-0.3
-4
-0.4
-0.4
-0.5
-0.5
1M
10M
FREQUENCY (Hz)
100M
1G
1000
0.2
-0.3
-5
VOUT = 100mVRMS
0.4
-3
100k
10
1
FREQUENCY (Hz)
MAX4144/46 TOC06a
4
100M
FREQUENCY (Hz)
MAX444/46 TOC05
5
10M
1M
-2
-3
NORMAILIZED GAIN (dB)
100k
VOUT = 100mVRMS
4
NORMALIZED GAIN (dB)
1
0
GAIN (dB)
2
MAX4144/4146-04
NORMALIZED GAIN (dB)
2
1
0
VOUT = 100mVRMS
3
5
MAX4144/6 TOC-02
VOUT = 100mVRMS
3
4
4
MAX4144/6 TOC-01
5
4
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
100k
1M
10M
FREQUENCY (Hz)
100M
1G
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.)
NORMALIZED GAIN (dB)
3
0.2
0.1
0
-0.1
-0.2
2
1
0
-1
-2
2
1
0
-1
-2
-3
-3
-4
-0.4
-4
-5
-0.5
-5
1
10
100
100k
1M
10M
100M
100k
1G
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
MAX4146 SMALL-SIGNAL GAIN
vs. FREQUENCY (AV = +10)
MAX4146
LARGE-SIGNAL GAIN
vs. FREQUENCY (AV = +100)
MAX4144
SMALL-SIGNAL
PULSE RESPONSE (AV = +2)
MAX4144/4146-10
3
MAX4144/6 TOC-09
VOUT = 2VP-P
2
NORMALIZED GAIN (dB)
1
2
1
0
-1
-2
0
VOLTAGE (20mV/div)
VOUT = 2VP-P
-1
-2
-3
-4
-3
-5
-4
-6
1G
MAX4144 toc11
FREQUENCY (Hz)
3
IN
GND
OUT
GND
-7
-5
0.1
1
10
100
1,000
100k
FREQUENCY (Hz)
1M
10M
100M
1G
TIME (10ns/div)
FREQUENCY (Hz)
MAX4145
SMALL-SIGNAL
PULSE RESPONSE (AV = +1)
MAX4146
SMALL-SIGNAL
PULSE RESPONSE (AV = +100)
MAX4146
SMALL-SIGNAL
PULSE RESPONSE (AV = +10)
MAX4144/4146 toc12
MAX4144 toc13
MAX4144 toc14
NORMALIZED GAIN (dB)
-6
1000
5
4
VOUT = 2VP-P
3
-0.3
0.1
MAX4144/46 TOC-8
4
4
MAX4144/4146-07
VOUT = 2VP-P
NORMALIZED GAIN (dB)
VOUT = 100mVRMS
0.3
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)
MAX4146 0.1dB GAIN FLATNESS
vs. FREQUENCY (AV = +10)
IN
GND
TIME (10ns/div)
OUT
GND
TIME (10ns/div)
1mV/div
GND
OUT
GND
20mV/div
OUT
GND
VOLTAGE
IN
GND
VOLTAGE (20mV/div)
VOLTAGE (50mV/div)
IN
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)
GND
IN
GND
OUT
GND
TIME (10ns/div)
IN
GND
OUT
GND
TIME (10ns/div)
TIME (10ns/div)
MAX4146
LARGE-SIGNAL
PULSE RESPONSE (AV = +100)
MAX4144
DIFFERENTIAL GAIN AND PHASE
(500mV/div)
GND
10
100
IRE
0.1
0.01
TIME (10ns/div)
0.01
0
-0.01
-0.02
-0.03 AV = 2V/V
-0.04
0
1
PHASE (deg)
OUT
MAX4144/6 toc-19
(20mV/div)
GND
CLOSED-LOOP OUTPUT IMPEDANCE (Ω)
100
GAIN (%)
TOC-18
CLOSED-LOOP OUTPUT IMPEDANCE
vs. FREQUENCY (AV = +1)
IN
VOLTAGE
VOLTAGE (500mV/div)
OUT
VOLTAGE (1V/div)
GND
TOC-17
MAX4144/46 TOC16
TOC-15
VOLTAGE (500mV/div)
IN
MAX4146
LARGE-SIGNAL
PULSE RESPONSE (AV = +10)
MAX4144/6 TOC-20
MAX4144
LARGE-SIGNAL
PULSE RESPONSE (AV = +2)
100k
1M
10M
100M
0.04
0.03
0.02
0.01
0
-0.01
AV = 2V/V
0
1G
100
IRE
FREQUENCY (Hz)
-0.15
0
100
IRE
PHASE (deg)
100
IRE
AV = 10V/V
100
IRE
AV = 1V/V
0
6
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.10
MAX4144/4146-23
-0.05
8.0
OUTPUT SWING (VP-P)
0
0.08
0.06
0.04
0.02
0
-0.02
0
-0.10
AV = 1V/V
9.0
MAX4144/6 TOC-22
0.05
GAIN (%)
0.05
0
-0.05
-0.10
-0.15
-0.20
OUTPUT SWING
vs. LOAD RESISTANCE
MAX4146
DIFFERENTIAL GAIN AND PHASE
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
DISTORTION (dBc)
-40
3RD HARMONIC
-60
-70
-50
2ND HARMONIC
-60
-50
-60
-90
-100
-100
-100
10M
100M
100k
1M
10M
100M
100k
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
100k
1M
10M
-40
-50
-60
2ND HARMONIC
-80
3RD HARMONIC
-90
-100
0
100M
-30
-70
3RD HARMONIC
-100
-100
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
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)
-20
-40
2ND HARMONIC
-50
-10
-20
DISTORTION (dBc)
-30
-60
3RD HARMONIC
VOUT = 2VP-P
-30
-40
2ND HARMONIC
-50
-60
0
-10
-20
DISTORTION (dBc)
VOUT = 2VP-P
3RD HARMONIC
-30
-40
-60
-70
-80
-80
-80
-90
-90
-90
400
600
LOAD (Ω)
800
1k
2ND HARMONIC
-100
-100
200
3RD HARMONIC
-50
-70
-100
1k
MAX4144/46 TOC-32
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
VOUT = 2VP-P
-20
-70
-80
DISTORTION (dBc)
-30
MAX4144/4146-31
DISTORTION (dBc)
-30
0
-10
DISTORTION (dBc)
-20
VOUT = 2VP-P
-10
MAX4146
HARMONIC DISTORTION
vs. FREQUENCY (AV = +10)
MAX4144/46 TOC25
VOUT = 2VP-P
-50
0
MAX4144/46/ TOC-24
0
-10
MAX4145
HARMONIC DISTORTION
vs. FREQUENCY (AV = +1)
MAX4144/4146 TOC-26
MAX4144
HARMONIC DISTORTION
vs. FREQUENCY (AV = +2)
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)
-30
2ND HARMONIC
-60
-70
-80
3RD HARMONIC
-90
-100
1.0
1.5
2.0
2.5
3.0
3.5
-60
3RD HARMONIC
-60
-80
-80
-90
-90
-100
-100
1.0
1.5
2.0
2.5
3.0
3.5
3RD HARMONIC
0.5
1.0
1.5
2.0
2.5
3.0
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)
1000
10k
100k
1
10
100
1k
10k
100k
1
10k
FREQUENCY (Hz)
100k
1M
MAX4144/4146 TOC-40
10
1
10
100
1k
10k
FREQUENCY (Hz)
1k
10k
100k
1M
MAX4145
CURRENT NOISE DENSITY
vs. FREQUENCY (AV = +1)
0.1
1k
100
FREQUENCY (Hz)
MAX4144
CURRENT NOISE DENSITY
vs. FREQUENCY (AV = +2)
CURRENT NOISE (pA/√Hz)
10
100
10
1M
FREQUENCY (Hz)
MAX4144/4146-39
100
10
10
1M
FREQUENCY (Hz)
MAX4146
VOLTAGE NOISE DENSITY
vs. FREQUENCY (AV = +100)
100
3.5
100k
1M
100
MAX4144/46 TOC41Q
1k
CURRENT NOISE (pA/√Hz)
100
100
VOLTAGE NOISE (nV/√Hz)
OUTPUT SWING (VP-P)
1
8
-50
-70
0.5
2ND HARMONIC
-40
-70
4.0
10
10
-30
OUTPUT SWING (VP-P)
100
10
-50
-20
OUTPUT SWING (VP-P)
MAX4144/4146-36
VOLTAGE NOISE (nV/√Hz)
0.5
2ND HARMONIC
MAX4144/46 TOC-37
-50
-40
MAX4144/46 TOC35
-20
-30
0
-10
MAX4144/46-TOC38
-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
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
115
105
95
PSR (dB)
CURRENT NOISE (pA/√Hz)
MAX4144/46 TOC41R
1
1
85
75
65
55
45
35
0.1
0.1
10
100
1k
10k
100k
10
1M
100
1k
10k
100k
1M
100
90
80
70
70
CMR (dB)
80
60
50
60
50
40
40
30
30
20
VCM = 100mVRMS
1M
10M
100M
MAX4144/46 TOC44
90
CMR (dB)
110
MAX4144/6 TOC-43
110
100k
10M
MAX4145
COMMON-MODE REJECTION
vs. FREQUENCY (AV = 1)
100
10
1M
FREQUENCY (Hz)
MAX4144
COMMON-MODE REJECTION
vs. FREQUENCY (AV = 2)
20
25
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
VCM = 100mVRMS
10
100M
100k
FREQUENCY (Hz)
1M
10M
100M
100
90
SHUTDOWN RESPONSE TIME
MAX4144/6 TOC-45
SHDN
80
VOLTAGE
70
GND
(2.5V/div)
110
MAX4144/6 TOC-45
FREQUENCY (Hz)
MAX4146
COMMON-MODE REJECTION
vs. FREQUENCY (AV = +10)
60
50
OUT
40
30
20
VCM = 100mVRMS
10
100k
1M
GND
(1.V/div)
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
8, 9, 12,
14
10, 12
8, 9, 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
• 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.
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-
RG 1.4k
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.
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
Additionally, mismatches in the SENSE and REF traces
lead to common-mode gain errors. Common-mode
gain is approximated by the following equation:
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:
Substituting numbers for ΔRREF and ΔRSENSE into this
equation, we can see that if changes in ΔRREF and
ΔRSENSE 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
1 ⎡ 700Ω + ΔRSENSE ⎛
700Ω + ΔRREF ⎞
AV =
⎢
⎜1 +
⎟
R + 700Ω + ΔRREF ⎠
2⎣
R
⎝
700Ω + ΔRREF ⎤
+
⎥
R + 700Ω + ΔRREF ⎦
where ΔRSENSE and ΔRREF are the SENSE and REF
trace impedances, respectively. R is 700Ω for the
MAX4144 and MAX4145, and 100Ω for the MAX4146.
ΔRREF - ΔRSENSE
R + 700Ω
AVCM =
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
The value of RISO depends on the circuit’s gain and the
capacitive load (Figures 6 and 7). With higher capaci-
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
15
20
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 24AWG 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).
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
9
5
6
9
11
VIDEO
OUTPUT
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
10 N.C.
RG+ 5
MAX4145
MAX4146
RSENSE
IN- 2
N.C. 3
14 VCC
R
R
RSENSE
13 SENSE
12 N.C.
RF
11 OUT
RF
N.C. 5
14 VCC
R
10 N.C.
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
N.C.
QSOP
QSOP
Package Information
Chip Information
TRANSISTOR COUNT: 237
SUBSTRATE CONNECTED TO VEE
9
For the latest package outline information and land patterns, go
to www.maxim-ic.com/packages.
PACKAGE TYPE
PACKAGE CODE
DOCUMENT NO.
14 SO
S14-1
21-0041
16 QSOP
E16-4
21-0055
______________________________________________________________________________________
15
MAX4144/MAX4145/MAX4146
Pin Configurations
MAX4144/MAX4145/MAX4146
High-Speed, Low-Distortion,
Differential Line Receivers
Revision History
REVISION
NUMBER
REVISION
DATE
3
3/09
DESCRIPTION
Updated Typical Operating Characteristics
PAGES
CHANGED
4, 5, 9
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
© 2009 Maxim Integrated Products
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