MAX4146ESD-T [MAXIM]
Line Receiver, 1 Func, 1 Rcvr, PDSO14, 0.150 INCH, SOIC-14;
| 型号： | MAX4146ESD-T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Line Receiver, 1 Func, 1 Rcvr, PDSO14, 0.150 INCH, SOIC-14 光电二极管 接口集成电路 |
| 文件： | 总16页 (文件大小：414K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1147; Rev 2; 12/99
High-Speed, Low-Distortion,
Differential Line Receivers
________________General Description
____________________________Features
MAX4144:
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 ±5ꢀ power supplies and are capaꢁle of
driving a 150Ω load to ±±.ꢂꢀ. The MAX4144 has an
internally set closed-loop gain of +2ꢀ/ꢀ. The MAX4145
is optimized for gains from +1ꢀ/ꢀ to +10ꢀ/ꢀ, while the
MAX4146 is optimized for gains from +10ꢀ/ꢀ to
+100ꢀ/ꢀ. The MAX4145/MAX4146 require a single
external resistor to set the closed-loop gain.
ꢀ +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
MAX4145:
These amplifiers use laser-trimmed, matched thin-film
resistors to deliver a common-mode rejection (CMR) of
up to 90dB at 10MHz. Using current-feedꢁack tech-
niques, the MAX4144 achieves a 1±0MHz ꢁandwidth
and a 1000ꢀ/µs slew rate. The MAX4145 achieves a
ꢁandwidth of 180MHz and a slew rate of 600ꢀ/µs while
operating with a closed-loop gain of +1ꢀ/ꢀ, and the
MAX4146 features a ꢁandwidth of ꢂ0MHz and a slew
rate of 800ꢀ/µs with a gain of +10ꢀ/ꢀ. Excellent differ-
ential gain/phase and noise specifications make these
amplifiers ideal for a wide variety of video and RF
signal-processing applications.
ꢀ 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
For a complete differential transmission link, use the
MAX4144/MAX4145/MAX4146 with the MAX414ꢂ differ-
ential line driver (see the MAX414ꢂ data sheet for more
information).
MAX4146:
ꢀ External Gain Selection from +10V/V to +100V/V
ꢀ 70MHz Bandwidth (A = +10V/V)
V
________________________Applications
ꢀ 800V/µs Slew Rate
Differential to Single-Ended Conversion
Twisted-Pair to Coaxial Converter
High-Speed Instrumentation Amplifier
Data Acquisition
ꢀ 90dB CMR at 10MHz
ꢀ -82dBc SFDR (f = 10kHz)
ꢀ Very Low Noise: 3.45nV/√Hz (G = +100V/V)
ꢀ 800µA Shutdown
Medical Instrumentation
High-Speed Differential Line Receiver
_______________Ordering Information
PART
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
MAX4144ESD
MAX4144EEE
MAX4145ESD
MAX4145EEE
MAX4146ESD
MAX4146EEE
14 SO
16 QSOP
14 SO
16 QSOP
14 SO
Pin Configurations appear at end of data sheet.
16 QSOP
Typical Application Circuit appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
High-Speed, Low-Distortion,
Differential Line Receivers
ABSOLUTE MAXIMUM RATINGS
Supply ꢀoltage (ꢀ
to ꢀ )..................................................12ꢀ
Continuous Power Dissipation (T = +ꢂ0°C)
A
CC
EE
ꢀoltage on IN_, SHDN, REF, OUT,
SENSE, RG_.................................(ꢀ - 0.±ꢀ) to (ꢀ
Short-Circuit Duration to Ground........................................10sec
Input Current (IN_, RG_)...................................................±10mA
Output Current................................................................±120mA
14-Pin SO (derate 8.±±mW/°C aꢁove +ꢂ0°C)..............66ꢂmW
16-Pin QSOP (derate 8.±±mW/°C aꢁove +ꢂ0°C).........66ꢂmW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+±00°C
+ 0.±ꢀ)
CC
EE
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
(ꢀ
= +5ꢀ, ꢀ = -5ꢀ, SHDN = 0ꢀ, R = ∞, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.)
MAX A
CC
EE
L
A
MIN
PARAMETER
SYMBOL
CONDITIONS
Guaranteed ꢁy PSR test
MIN
TYP
MAX
±5.5
9
UNITS
ꢀ
Operating Supply ꢀoltage
Input Offset ꢀoltage
±4.5
ꢀ
OS
ꢀ
IN
ꢀ
IN
ꢀ
IN
ꢀ
IN
= 0ꢀ
= 0ꢀ
= 0ꢀ
= 0ꢀ
0.6
5
mꢀ
Input Offset ꢀoltage Drift
Input Bias Current
TC
µꢀ/°C
µA
ꢀOS
I
B
9
±0
±
Input Offset Current
I
0.1
1
µA
OS
Input Capacitance
C
R
pF
IN
Differential Input Resistance
1
MΩ
IN
MAX4144
MAX4145
MAX4146
-1.55
-2.8/G
-±.1/G
1.55
2.8/G
±.1/G
Differential Input ꢀoltage Range
R = 150Ω
ꢀ
ꢀ
L
Common-Mode Input ꢀoltage
Range
ꢀ
CM
Guaranteed ꢁy CMR test
-2.8
2.8
MAX4144
MAX4145
MAX4146
2
-1ꢀ ≤ ꢀ
L
≤ +1ꢀ,
OUT
R = 150Ω
Gain
A
ꢀ
1 + (1.4kΩ/R )
10 + (14kΩ/R )
ꢀ/ꢀ
G
G
MAX4144
A = 2ꢀ/ꢀ
0.02
0.5
2
2
5
2
5
ꢀ
A = 1ꢀ/ꢀ
ꢀ
-1ꢀ ≤ ꢀ
≤ +1ꢀ,
L
OUT
MAX4145
MAX4146
Gain Error
A = 10ꢀ/ꢀ
ꢀ
1.5
%
R = 150Ω
A = 10ꢀ/ꢀ
ꢀ
0.5
A = 100ꢀ/ꢀ
ꢀ
1.5
MAX4144
MAX4145
MAX4146
20
-1ꢀ ≤ ꢀ
L
≤ +1ꢀ,
OUT
R = 150Ω
Gain Drift
5 + 15G
14 + 0.9G
80
ppm/°C
Common-Mode Rejection
Power-Supply Rejection
Quiescent Supply Current
Shutdown Supply Current
CMR
PSR
ꢀ
CM
= ±2.8ꢀ
60
ꢂ0
dB
dB
ꢀ = ±4.5ꢀ to ±5.5ꢀ
S
85
11
16
2
mA
mA
I
ꢀ
SHDN
ꢀ
SHDN
≥ 2ꢀ
≥ 2ꢀ
0.8
SHDN
MAX4144
MAX4145
MAX4146
1.4
Shutdown Output Impedance
Output ꢀoltage Swing
1.4
kΩ
2
R = 100Ω
±±.6
L
ꢀ
OUT
R = 150Ω
±±.1
±±.4
±±.ꢂ
±±.8
ꢀ
L
R = ∞
L
2
_______________________________________________________________________________________
High-Speed, Low-Distortion,
Differential Line Receivers
DC ELECTRICAL CHARACTERISTICS (continued)
(ꢀ
= +5ꢀ, ꢀ = -5ꢀ, SHDN = 0ꢀ, R = ∞, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.)
MAX A
CC
EE
A
MIN
L
PARAMETER
SYMBOL
CONDITIONS
0°C ≤ T ≤ +85°C
MIN
ꢂ0
TYP
MAX
UNITS
100
A
Output Current Drive
I
ꢀ
OUT
= ±1.ꢂꢀ
mA
OUT
-40°C ≤ T ≤ 0°C
40
A
SHDN High Threshold
SHDN Low Threshold
ꢀ
2
ꢀ
ꢀ
IH
ꢀ
0.8
IL
ꢀ
ꢀ
≤ 0.8ꢀ
≥ 2ꢀ
ꢂ5
150
2
SHDN
SHDN Input Bias Current
I
µA
SHDN
0.06
SHDN
AC ELECTRICAL CHARACTERISTICS
(ꢀ
= +5ꢀ, ꢀ = -5ꢀ, SHDN = 0ꢀ, R = 150Ω, T = T
to T , unless otherwise noted. Typical values are at T = +25°C.)
MAX A
CC
EE
A
MIN
L
PARAMETER
SYMBOL
CONDITIONS
MAX4144
MIN
TYP
MAX
UNITS
A = 2ꢀ/ꢀ
ꢀ
1±0
MAX4145
A = 1ꢀ/ꢀ
180
ꢀ
ꢀ
0.1ꢀ
≤
RMS
OUT
-±dB Bandwidth
BW
MHz
(-±dB)
A = 10ꢀ/ꢀ
ꢀ
ꢂ0
MAX4146
A = 100ꢀ/ꢀ
ꢀ
±0
MAX4144
MAX4145
A = 2ꢀ/ꢀ
110
ꢀ
A = 1ꢀ/ꢀ
ꢀ
180
ꢀ
=
OUT
Full-Power Bandwidth
0.1dB Bandwidth
FPBW
MHz
MHz
2ꢀp-p
A = 10ꢀ/ꢀ
ꢀ
ꢂ0
MAX4146
A = 100ꢀ/ꢀ
ꢀ
±0
MAX4144
MAX4145
MAX4146
MAX4144
MAX4145
MAX4146
A = 2ꢀ/ꢀ
ꢀ
±0
ꢀ
OUT
≤
RMS
BW
A = 1ꢀ/ꢀ
ꢀ
90
(0.1dB)
0.1ꢀ
A = 10ꢀ/ꢀ
ꢀ
50
12
Input ꢀoltage Noise Density
Input Current Noise Density
Common-Mode Rejection
e
n
f = 1MHz
f = 1MHz
f = 10MHz
1.8 + (20/G)
nꢀ/√Hz
pA/√Hz
dB
2.1 + (1±5/G)
i
n
1.ꢂ
ꢂ0
MAX4144
MAX4145
MAX4146
MAX4144
MAX4145
MAX4146
MAX4144
MAX4145
MAX4146
MAX4144
MAX4145
MAX4146
CMR
SR
ꢂ5
90
1000
600
800
2±
Slew Rate
-2ꢀ ≤ ꢀ
≤ +2ꢀ
ꢀ/µs
ns
OUT
to 0.1%
20
1ꢂ
-2ꢀ ≤ ꢀ
≤ +2ꢀ
OUT
Settling Time to 0.1%
t
S
±6
to 0.01%
±8
40
Enaꢁle Time from Shutdown
Disaꢁle Time to Shutdown
45
ns
µs
40
MAX4144
MAX4145
MAX4146
0.0±
0.01
0.12
Differential Gain (Note 1)
DG
f = ±.58MHz
%
_______________________________________________________________________________________
3
High-Speed, Low-Distortion,
Differential Line Receivers
AC ELECTRICAL CHARACTERISTICS (continued)
(ꢀ
= +5ꢀ, ꢀ = -5ꢀ, SHDN = 0ꢀ, R = 150Ω, T = T
to T
, unless otherwise noted. Typical values are at T = +25°C.)
MAX A
CC
EE
A
MIN
L
PARAMETER
SYMBOL
CONDITIONS
MAX4144
MAX4145
MAX4146
MAX4144
MAX4145
MAX4146
MAX4144
MAX4145
MAX4146
MIN
TYP
0.0±
0.06
0.0ꢂ
-90
MAX
UNITS
Differential Phase (Note 1)
DP
f = ±.58MHz
f = 10kHz,
Degrees
A = 2ꢀ/ꢀ
ꢀ
A = 1ꢀ/ꢀ
ꢀ
-92
ꢀ
OUT
= 2ꢀp-p
A = 10ꢀ/ꢀ
ꢀ
-82
Spurious-Free Dynamic Range
SFDR
dBc
A = 2ꢀ/ꢀ
ꢀ
-66
f = 5MHz,
= 2ꢀp-p
A = 1ꢀ/ꢀ
ꢀ
-6ꢂ
ꢀ
OUT
A = 10ꢀ/ꢀ
ꢀ
-48
Note 1: Differential gain and phase are tested using a modulated ramp, 100 IRE (0.ꢂ14ꢀ).
__________________________________________Typical Operating Characteristics
(ꢀ
= +5ꢀ, ꢀ = -5ꢀ, SHDN = 0ꢀ, R = 150Ω, T = +25°C, unless otherwise noted.)
L
EE A
CC
MAX4144
SMALL-SIGNAL GAIN
vs. FREQUENCY (A = +2)
MAX4145
SMALL-SIGNAL GAIN
vs. FREQUENCY (A = +1)
MAX4146
SMALL-SIGNAL GAIN
vs. FREQUENCY (A = +10)
V
V
V
4
5
4
5
V
OUT
= 100mV
V
OUT
= 100mV
V
= 100mV
RMS
RMS
OUT RMS
3
2
4
3
3
1
2
2
0
1
1
0
-1
-2
-3
-4
-5
-6
0
-1
-2
-3
-4
-5
-1
-2
-3
-4
-5
10M
100M
1G
10M
100M
1G
10M
100M
1G
100k
1M
100k
1M
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
MAX4144
0.1dB GAIN FLATNESS vs.
MAX4146
SMALL-SIGNAL GAIN
MAX4145
0.1dB GAIN FLATNESS vs.
FREQUENCY (A = +2)
vs. FREQUENCY (A = +100)
V
V
FREQUENCY (A = +1)
V
0.5
0.4
5
0.5
0.4
V
OUT
= 100mV
RMS
V
OUT
= 100mV
RMS
V
OUT
= 100mV
RMS
4
3
2
1
0.3
0.3
0.2
0.2
0.1
0.1
0
0
-1
-2
-3
0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.1
-0.2
-0.3
-0.4
-0.5
-4
-5
100k
1M
10M
FREQUENCY (Hz)
100M
1G
100k
1M
10M
FREQUENCY (Hz)
100M
1G
100k
1M
10M
100M
1G
FREQUENCY (Hz)
4
_______________________________________________________________________________________
High-Speed, Low-Distortion,
Differential Line Receivers
_____________________________Typical Operating Characteristics (continued)
(ꢀ
= +5ꢀ, ꢀ = -5ꢀ, SHDN = 0ꢀ, R = 150Ω, T = +25°C, unless otherwise noted.)
L
CC
EE
A
MAX4146
0.1dB GAIN FLATNESS vs.
MAX4145
LARGE-SIGNAL GAIN
vs. FREQUENCY (A = +1)
MAX4144
LARGE-SIGNAL GAIN
vs. FREQUENCY (A = +2)
FREQUENCY (A = +10)
V
V
V
0.5
4
3
5
4
3
2
1
V
OUT
= 2Vp-p
V
OUT
= 100mV
V
OUT
= 2Vp-p
RMS
0.4
0.3
2
0.2
1
0.1
0
0
-1
-2
-3
-1
-2
-3
-4
-5
-6
0
-0.1
-0.2
-0.3
-0.4
-0.5
-4
-5
100k
1M
10M
100M
1G
100k
1M
10M
100M
1G
100k
1M
10M
100M
1G
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
MAX4144
SMALL-SIGNAL
PULSE RESPONSE (A = +2)
MAX4146
SMALL-SIGNAL GAIN
vs. FREQUENCY (A = +10)
MAX4146
LARGE-SIGNAL GAIN
vs. FREQUENCY (A = +100)
V
V
V
5
4
3
V
OUT
= 100mV
V = 2Vp-p
OUT
RMS
2
1
IN
GND
GND
3
2
0
1
-1
0
-2
-3
-4
-5
-1
-2
-3
-4
-5
OUT
-6
-7
10M
100M
1G
100k
1M
100k
1M
10M
100M
1G
TIME (10ns/div)
FREQUENCY (Hz)
FREQUENCY (Hz)
MAX4145
SMALL-SIGNAL
PULSE RESPONSE (A = +1)
MAX4146
SMALL-SIGNAL
PULSE RESPONSE (A = +100)
MAX4146
SMALL-SIGNAL
PULSE RESPONSE (A = +10)
V
V
V
MAX4144/4146 TOC12
IN
GND
GND
IN
GND
GND
IN
GND
GND
OUT
OUT
OUT
TIME (10ns/div)
TIME (10ns/div)
TIME (10ns/div)
_______________________________________________________________________________________
5
High-Speed, Low-Distortion,
Differential Line Receivers
_____________________________Typical Operating Characteristics (continued)
(ꢀ
= +5ꢀ, ꢀ = -5ꢀ, SHDN = 0ꢀ, R = 150Ω, T = +25°C, unless otherwise noted.)
L
CC
EE
A
MAX4145
LARGE-SIGNAL
PULSE RESPONSE (A = +1)
MAX4144
LARGE-SIGNAL
PULSE RESPONSE (A = +2)
MAX4146
LARGE-SIGNAL
PULSE RESPONSE (A = +10)
V
V
V
MAX4144/46 TOC16
IN
GND
GND
IN
GND
GND
IN
GND
GND
OUT
OUT
OUT
TIME (10ns/div)
TIME (10ns/div)
TIME (10ns/div)
MAX4146
LARGE-SIGNAL
PULSE RESPONSE (A = +100)
CLOSED-LOOP OUTPUT IMPEDANCE
MAX4144
DIFFERENTIAL GAIN AND PHASE
vs. FREQUENCY (A = +1)
V
V
100
10
1
0.01
0
-0.01
-0.02
-0.03
-0.04
IN
GND
GND
A
A
= 2V/V
V
0
0
100
OUT
IRE
0.04
0.03
0.02
0.01
0
= 2V/V
V
0.1
-0.01
0.01
100k
1M
10M
100M
1G
100
TIME (10ns/div)
IRE
FREQUENCY (Hz)
MAX4146
DIFFERENTIAL GAIN AND PHASE
OUTPUT SWING
vs. LOAD RESISTANCE
MAX4145
DIFFERENTIAL GAIN AND PHASE
0.05
0
9.0
0.05
0
-0.05
-0.10
-0.15
-0.20
8.0
7.0
6.0
5.0
-0.05
-0.10
-0.15
A
= 1V/V
A
= 10V/V
= 10V/V
V
V
0
100
0
100
IRE
IRE
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.10
0.08
0.06
0.04
0.02
0
4.0
3.0
A
V
A
= 1V/V
V
-0.02
0
100
0
50
100
150
200
250
0
100
IRE
LOAD (Ω)
IRE
6
_______________________________________________________________________________________
High-Speed, Low-Distortion,
Differential Line Receivers
_____________________________Typical Operating Characteristics (continued)
(ꢀ
= +5ꢀ, ꢀ = -5ꢀ, SHDN = 0ꢀ, R = 150Ω, T = +25°C, unless otherwise noted.)
L
EE A
CC
MAX4144
HARMONIC DISTORTION
vs. FREQUENCY (A = +2)
MAX4146
HARMONIC DISTORTION
vs. FREQUENCY (A = +10)
MAX4145
HARMONIC DISTORTION
vs. FREQUENCY (A = +1)
V
V
V
0
0
0
V
OUT
= 2Vp-p
V
OUT
= 2Vp-p
V
OUT
= 2Vp-p
-10
-10
-10
-20
-30
-40
-50
-60
-70
-80
-90
-20
-30
-40
-50
-60
-70
-80
-90
-20
-30
-40
-50
-60
-70
-80
-90
2ND HARMONIC
3RD HARMONIC
2ND HARMONIC
3RD HARMONIC
3RD HARMONIC
2ND HARMONIC
-100
-100
-100
100k
1M
10M
100M
100k
1M
10M
100M
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
MAX4145
5MHz HARMONIC DISTORTION
vs. LOAD (A = +1)
MAX4146
HARMONIC DISTORTION
MAX4144
5MHz HARMONIC DISTORTION
vs. FREQUENCY (A = +100)
V
vs. LOAD (A = +2)
V
V
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
0
0
V
= 2Vp-p
OUT
V
OUT
= 2Vp-p
V
= 2Vp-p
OUT
-10
-10
-20
-30
-40
-50
-60
-70
-80
-90
-20
-30
2ND HARMONIC
-40
-50
-60
2ND HARMONIC
2ND HARMONIC
3RD HARMONIC
-70
3RD HARMONIC
3RD HARMONIC
-80
-90
-100
-100
0
200
400
600
800
1k
100k
1M
10M
100M
0
200
400
600
800
1k
LOAD (Ω)
FREQUENCY (Hz)
LOAD (Ω)
MAX4146
5MHz HARMONIC DISTORTION
MAX4144
5MHz HARMONIC DISTORTION
vs. OUTPUT SWING (A = +2)
MAX4146
5MHz HARMONIC DISTORTION
vs. LOAD (A = +100)
vs. LOAD (A = +10)
V
V
V
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
0
0
V
OUT
= 2Vp-p
V
= 2Vp-p
OUT
-10
-10
-20
-30
-20
-30
-40
-50
-40
-50
2ND HARMONIC
3RD HARMONIC
2ND HARMONIC
-60
-60
3RD HARMONIC
3RD HARMONIC
-70
-70
-80
-80
2ND HARMONIC
-90
-90
-100
-100
0
200
400
600
800
1k
0
200
400
600
800
1k
0.5
1.0
1.5
2.0
2.5
3.0
3.5
LOAD (Ω)
LOAD (Ω)
VOLTAGE SWING (Vp-p)
_______________________________________________________________________________________
7
High-Speed, Low-Distortion,
Differential Line Receivers
_____________________________Typical Operating Characteristics (continued)
(ꢀ
= +5ꢀ, ꢀ = -5ꢀ, SHDN = 0ꢀ, R = 150Ω, T = +25°C, unless otherwise noted.)
L
EE A
CC
MAX4145
5MHz HARMONIC DISTORTION
vs. OUTPUT SWING (A = +1)
MAX4146
5MHz HARMONIC DISTORTION
vs. OUTPUT SWING (A = +10)
MAX4146
5MHz HARMONIC DISTORTION
vs. OUTPUT SWING (A = +100)
V
V
V
0
0
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
2ND HARMONIC
3RD HARMONIC
2ND HARMONIC
3RD HARMONIC
2ND HARMONIC
3RD HARMONIC
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
OUTPUT SWING (Vp-p)
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0.5
1.0
1.5
2.0
2.5
3.0
3.5
OUTPUT SWING (Vp-p)
OUTPUT SWING (Vp-p)
MAX4144
VOLTAGE NOISE DENSITY
vs. FREQUENCY (A = +2)
MAX4145
VOLTAGE NOISE DENSITY
vs. FREQUENCY (A = +1)
MAX4146
VOLTAGE NOISE DENSITY
vs. FREQUENCY (A = +10)
V
V
V
1000
100
10
100
10
1
100
10
1
10
100
1k
10k
100k
1M
10
100
1k
10k
100k
1M
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
MAX4146
VOLTAGE NOISE DENSITY
MAX4144
CURRENT NOISE DENSITY
vs. FREQUENCY (A = +2)
MAX4145
CURRENT NOISE DENSITY
vs. FREQUENCY (A = +1)
vs. FREQUENCY (A = +100)
V
V
V
100
10
1
10
100
10
1
1
0.1
10
100
1k
10k
100k
1M
10
100
1k
10k
100k
1M
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
8
_______________________________________________________________________________________
High-Speed, Low-Distortion,
Differential Line Receivers
_____________________________Typical Operating Characteristics (continued)
(ꢀ
= +5ꢀ, ꢀ = -5ꢀ, SHDN = 0ꢀ, R = 150Ω, T = +25°C, unless otherwise noted.)
L
EE A
CC
MAX4146
CURRENT NOISE DENSITY
MAX4146
CURRENT NOISE DENSITY
vs. FREQUENCY (A = +10)
POWER-SUPPLY REJECTION
vs. FREQUENCY
vs. FREQUENCY (A = +100)
V
V
10
125
115
105
95
10
85
1
75
65
55
45
1
35
25
100k
0.1
0.1
1M
10M
100M
10
100
1k
10k
100k
1M
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
MAX4144
COMMON-MODE REJECTION
vs. FREQUENCY (A = +1)
MAX4145
COMMON-MODE REJECTION
vs. FREQUENCY (A = +2)
V
V
110
100
90
80
70
60
50
40
30
20
10
110
100
90
80
70
60
50
40
30
20
10
V
= 100mV
RMS
CM
V
= 100mV
CM
RMS
10M
100M
100k
1M
10M
100M
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
MAX4146
COMMON-MODE REJECTION
vs. FREQUENCY (A = +10)
SHUTDOWN RESPONSE TIME
V
MAX4144/6 TOC-45
110
100
90
80
70
60
50
40
30
20
10
SHDN
GND
OUT
GND
V
CM
= 100mV
RMS
10M
100M
100k
1M
TIME (20µs/div)
FREQUENCY (Hz)
_______________________________________________________________________________________
9
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, ꢂ
2
1, ꢂ
2
1, ꢂ
2
1, ꢂ
2
1, ꢂ
2
1, ꢂ
2
ꢀ
Negative Power Supply
EE
IN-
N.C.
RG-
Inverting Input
±, 5, 10,
12
±, 5, 8, 9,
12,14
10, 12
±
12, 14
±
10, 12
±
12, 14
±
No Connect. Not internally connected.
Inverting Input for Gain-Set Resistor
—
—
Logic Input for Shutdown Circuitry. A logic
low enaꢁles the amplifier. A logic high
disaꢁles the amplifier.
4
4
4
4
4
4
SHDN
—
6
—
6
5
6
5
6
5
6
5
6
RG+
IN+
Noninverting Input for Gain-Set Resistor
Noninverting Input
8, 14
10, 16
8, 14
10, 16
8, 14
10, 16
ꢀ
CC
Positive Power Supply
Output Reference. Connect to ground for
normal operation.
9
11
1±
15
9
11
1±
15
9
11
1±
15
REF
OUT
11
1±
11
1±
11
1±
Output
Output Sense. Connect to OUT close to
the pin for normal operation.
SENSE
mode noise, such as receiving T1 or xDSL transmis-
sions over a twisted-pair caꢁle. Excellent differential
gain and phase, along with low noise, also suit them to
video applications and RF signal processing.
________________Detailed Description
The MAX4144/MAX4145/MAX4146 are low-distortion,
differential line receivers that feature high ꢁandwidths
and excellent common-mode rejection, making them
ideal for ꢁalanced, high-speed data transmission sys-
tems.
For a complete differential transmission link, use the
MAX4144/MAX4145/MAX4146 amplifiers with the
MAX414ꢂ line driver, as shown in the Typical Applica-
tion Circuit.
The MAX4144 has a preset gain of +2ꢀ/ꢀ and achieves
a 1±0MHz -±dB ꢁandwidth, a 1000ꢀ/µs slew rate, and
common-mode rejection (CMR) of ꢂ0dB at 10MHz. The
MAX4145 and MAX4146 use a single external resistor to
set the closed-loop gain from +1ꢀ/ꢀ to +10ꢀ/ꢀ for the
MAX4145, or greater than +10ꢀ/ꢀ for the MAX4146. The
MAX4145 achieves a -±dB ꢁandwidth of 180MHz, a
slew rate of 600ꢀ/µs, and CMR of ꢂ5dB at 10MHz when
operating in the unity-gain configuration. The MAX4146
attains a -±dB ꢁandwidth of ꢂ0MHz, a slew rate of
800ꢀ/µs, and CMR of 90dB at 10MHz when operating
with a closed-loop gain of +10ꢀ/ꢀ.
___________Applications Information
Grounding, Bypassing,
and PC Board Layout
Adhere to the following high-frequency design tech-
niques when designing the PC ꢁoard for the
MAX4144/MAX4145/MAX4146.
• The printed circuit ꢁoard should have at least two
layers: the signal layer and the ground plane.
• Do not use wire-wrap ꢁoards—they are too
inductive.
Differential inputs make the MAX4144/MAX4145/
MAX4146 ideal for applications with high common-
10 ______________________________________________________________________________________
High-Speed, Low-Distortion,
Differential Line Receivers
• Do not use IC sockets—they increase parasitic
For a large differential input voltage (exceeding 4ꢀ), the
MAX4145/MAX4146 input ꢁias current (at IN+ and IN-)
increases according to the following equation:
capacitance and inductance.
• Use surface-mount power-supply ꢁypass capacitors
instead of through-hole capacitors. Their shorter
lead lengths reduce parasitic inductance, leading to
superior high-frequency performance.
ꢀ
- ꢀ
- 10ꢀ
IN+
IN- F
(
)
Input Current =
R
G
• Keep signal lines as short and as straight as possi-
ꢁle. Do not make 90° turns; round all corners.
The MAX4144 has an internal gain-setting resistor val-
ued at 1.4kΩ. A differential input voltage as high as 10ꢀ
will cause only 4.±mA to flow—much less than the
10mA aꢁsolute maximum rating. However, in the
• The ground plane should ꢁe as free from voids as
possiꢁle.
MAX4145/MAX4146, R can ꢁe as low as 150Ω. Under
Output Short-Circuit Protection
Under short-circuit conditions to ground, limit the out-
put current to 120mA. This level is low enough that a
short to ground of moderate duration will not cause per-
manent damage to the chip. However, a short to either
supply will significantly increase power dissipation, and
will cause permanent damage. The high output current
capaꢁility is an advantage in systems that transmit a
signal to several loads.
G
this condition, the aꢁsolute maximum input current rat-
ing might ꢁe exceeded if the differential input voltage
exceeds 5.5ꢀ (10mA x 150Ω + 10ꢀ ). In that case,
F
510Ω resistors can ꢁe placed at IN+ and IN- to limit the
current without degrading performance.
Shutdown Mode
The MAX4144/MAX4145/MAX4146 can ꢁe put into low-
power shutdown mode ꢁy ꢁringing SHDN high. The
amplifier output is high impedance in this mode; thus
the impedance at OUT is that of the feedꢁack resistors
(1.4kΩ).
Input Protection Circuitry
The MAX4144/MAX4145/MAX4146 include internal pro-
tection circuitry that prevents damage to the precision
input stage from large differential input voltages. This
protection circuitry consists of five ꢁack-to-ꢁack
Schottky protection diodes ꢁetween IN+ and RG+, and
IN- and RG- (Figure 1). The diodes limit the differential
voltage applied to the amplifiers’ internal circuitry to no
Setting Gain (MAX4145/MAX4146)
The MAX4145/MAX4146’s gain is determined ꢁy a sin-
gle external resistor, R . The optimal gain range is from
G
+1ꢀ/ꢀ to +10ꢀ/ꢀ for the MAX4145 and +10ꢀ/ꢀ (R
=
G
open) to +100ꢀ/ꢀ for the MAX4146. The gain (in ꢀ/ꢀ) is
given in the following equations:
more than 10ꢀ , where ꢀ is the diode’s forward volt-
F
F
age drop (aꢁout 0.4ꢀ at +25°C).
IN-
IN-
R -
G
1.4k
MAX4144
MAX4145
MAX4146
R +
G
IN+
IN+
Figure 1. Input Protection Circuits
______________________________________________________________________________________ 11
High-Speed, Low-Distortion,
Differential Line Receivers
SENSE
IN+
R
L
OUT
REF
R
G
MAX4145
MAX4146
IN-
MAX4144
MAX4145
MAX4146
Figure 2. Connection of R in MAX4146
G
Figure 3. Connection of SENSE and REF to a Remote Load
Additionally, mismatches in the SENSE and REF traces
lead to common-mode gain errors. Common-mode
gain is approximated ꢁy the following equation:
1.4kΩ
G = A = 1 +
(MAX4145)
(MAX4146)
ꢀ
R
G
∆R
- ∆R
SENSE
REF
14kΩ
AꢀCM =
G = A = 10 +
ꢀ
R + ꢂ00Ω
R
G
Suꢁstituting numꢁers for ∆R and ∆R
into this
SENSE
REF
Figure 2 shows the connection for R . R might simply
G
G
equation, we can see that if changes in ∆R
and
REF
ꢁe a resistor, or it can ꢁe a complex pole-zero pair for
filter and shaping applications (Figure 9). Use surface-
mount gain-setting components to ensure staꢁility.
∆R
are equal, CMR is not degraded.
SENSE
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 ꢁack-terminated
caꢁle). In most amplifier circuits, driving large load
capacitance increases the chance of oscillations. The
amplifier’s output impedance and the load capacitor
comꢁine 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,
Using REF and SENSE
The MAX4144/MAX4145/MAX4146 have a REF pin (nor-
mally connected to ground) and a SENSE pin (normally
connected to OUT). In some long-line applications, it
may ꢁe desiraꢁle to connect SENSE and OUT together
at the load, instead of the typical connection at the part
(Figure ±). This compensates for the long line’s resis-
tance, 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 ꢁy the following equation:
5
4
1 ꢂ00Ω + ∆R
ꢂ00Ω + ∆R
REF
SENSE
A =
1 +
ꢀ
3
2
2
R
R + ꢂ00Ω + ∆R
REF
C = 15pF
L
1
0
ꢂ00Ω + ∆R
R + ꢂ00Ω + ∆R
REF
+
C = 5pF
L
REF
-1
-2
-3
-4
-5
C = 10pF
L
where ∆R
and ∆R
are the SENSE and REF
trace impedances, respectively. R is ꢂ00Ω for the
MAX4144 and MAX4145, and 100Ω for the MAX4146.
SENSE
REF
100k
1M
10M
100M
1G
FREQUENCY (Hz)
Figure 4. MAX4144 Small-Signal Response with Capacitive
Load
12 ______________________________________________________________________________________
High-Speed, Low-Distortion,
Differential Line Receivers
which appears inductive at high frequencies. This
tive values, ꢁandwidth is dominated ꢁy the RC network
formed ꢁy R and C ; the ꢁandwidth of the amplifier
itself is much higher. Also note that the isolation resistor
forms a divider that decreases the voltage delivered to
the load.
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.
ISO
L
The MAX4144/MAX4145/MAX4146 drive capacitive
loads up to 25pF without oscillation. However, some
peaking may occur in the frequency domain (Figure 4).
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).
To drive larger capacitance and reduce ringing, add an
isolation resistor (R ) ꢁetween the amplifier’s output
ISO
and the load (Figure 5).
The value of R
depends on the circuit’s gain and the
ISO
capacitive load (Figures 6 and ꢂ). With higher capaci-
30
25
20
15
R
ISO
OUT
R
LOAD
C
LOAD
10
MAX4144
MAX4145
MAX4146
5
0
0
50
100
150
200
250
CAPACITIVE LOAD (pF)
Figure 6. MAX4144 Isolation Resistance vs. Capacitve Load
Figure 5. Addition of R
to Amplifier Output
ISO
20
18
16
15
10
5
A = 10V/V
V
0
14
12
-5
-10
-15
-20
10
8
-25
-30
-35
6
4
0
50
100
150
200
250
10k
100k
1M
10M
CAPACITIVE LOAD (pF)
FREQUENCY (Hz)
Figure 7. MAX4145/MAX4146 Isolation Resistance vs.
Capacitive Load
Figure 8. 1000 Feet of AWG24 Twisted-Pair Telephone Cable
(Gain vs. Frequency)
______________________________________________________________________________________ 13
High-Speed, Low-Distortion,
Differential Line Receivers
Losses are higher at higher frequencies, contriꢁuting to
severe pulse-edge rounding in digital applications. The
nominal impedance of twisted-pair telephone wire is
110Ω.
The MAX4145/MAX4146, with variaꢁle gain up to
+10ꢀ/ꢀ and +100ꢀ/ꢀ, respectively, can ꢁe used to
compensate for caꢁle losses. In the graph shown in
Figure 8, the caꢁle characteristics are such that the
video-chroma frequency loss is almost 15dB greater
than the low-frequency loss. The losses can ꢁe com-
pensated for ꢁy 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 caꢁle. The differential gain and
phase, using the circuit shown in Figure 9, is 0.55%
and 0.18°, respectively.
V
V
CC
CC
1000 FEET
0.1µF
0.1µF
8, 14
8, 14
2
3
13
2
13
12
100pF
75Ω
VIDEO
OUTPUT
75Ω
VIDEO INPUT
110Ω
MAX4147ESD
10
MAX4146ESD
560Ω
11
6
9
5
6
9
1, 7
1, 7
75Ω
0.1µF
V
EE
0.1µF
V
EE
Figure 9. Circuit for Transmitting NTSC/PAL Video Over 1000 Feet of Twisted-Pair Telephone Line
__________________________________________________Typical Application Circuit
R
T
R
T
T
IN+
IN-
SENSE
SENSE+
IN-
IN+
75Ω
COAX
75Ω
OUT+
OUT-
V
OUT
MAX4144
MAX4147
OUT
R
75Ω
REF
SENSE-
R
T
TWISTED-PAIR-TO-COAX CABLE CONVERTER
14 ______________________________________________________________________________________
High-Speed, Low-Distortion,
Differential Line Receivers
Pin Configurations
TOP VIEW
MAX4144
MAX4145
MAX4146
R
V
1
14
V
1
14 V
V
EE
EE
CC
CC
R
R
R
SENSE
SENSE
IN-
N.C.
2
3
4
13 SENSE
IN-
RG-
2
3
4
13 SENSE
N.C.
N.C.
12
12
R
R
R
F
F
R
G
11 OUT
10 N.C.
11 OUT
10 N.C.
SHDN
N.C.
SHDN
RG+
R
F
R
F
R
5
6
7
5
6
7
R
REF
R
REF
IN+
9
8
REF
IN+
9
8
REF
V
EE
V
CC
V
EE
V
CC
SO
SO
MAX4144
MAX4145
MAX4146
R
V
1
16
V
1
16
V
V
EE
EE
CC
CC
R
R
R
SENSE
SENSE
IN-
N.C.
2
3
4
15 SENSE
IN-
RG-
2
3
4
15 SENSE
N.C.
N.C.
14
14
R
R
R
F
F
R
G
13 OUT
12 N.C.
11 REF
13 OUT
12 N.C.
11 REF
SHDN
N.C.
SHDN
RG+
R
F
R
F
R
5
6
7
8
5
6
7
8
R
REF
R
REF
IN+
IN+
V
EE
10
9
V
CC
V
EE
10
9
V
CC
N.C.
N.C
N.C.
N.C.
QSOP
QSOP
___________________Chip Information
TRANSISTOR COUNT: 2±ꢂ
SUBSTRATE CONNECTED TO ꢀ
EE
______________________________________________________________________________________ 15
High-Speed, Low-Distortion,
Differential Line Receivers
________________________________________________________Package Information
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
© 1999 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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