MAX4146EEE [MAXIM]
High-Speed, Low-Distortion, Differential Line Receivers; 高速，低失真，差动线路接收器
| 型号： | MAX4146EEE |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | High-Speed, Low-Distortion, Differential Line Receivers |
| 文件： | 总16页 (文件大小：213K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1147; Rev 1; 1/98
Hig h -S p e e d , Lo w -Dis t o rt io n ,
Diffe re n t ia l Lin e Re c e ive rs
5/MAX146
________________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
MAX4144:
The MAX4144/MAX4145/MAX4146 d iffe re ntia l 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 op timize d for g a ins from + 10V/V to
+100V/V. The MAX4145/MAX4146 re q uire a s ing le
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-feedback tech-
niques, 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 differ-
ential gain/phase and noise specifications make these
a mp lifie rs id e a l for a wid e va rie ty of vid e o a nd 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 MAX4147 differ-
ential line driver (see the MAX4147 data sheet for more
information).
MAX4146:
♦ External Gain Selection from +10V/V to +100V/V
♦ 70MHz Bandwidth (A = +10V/V)
V
________________________Ap p lic a t io n s
♦ 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
_______________Ord e rin g In fo rm a t io n
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
14 SO
MAX4144ESD
MAX4144EEE
MAX4145ESD
MAX4145EEE
MAX4146ESD
MAX4146EEE
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 & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
For small orders, phone 408-737-7600 ext. 3468.
Hig h -S p e e d , Lo w -Dis t o rt io n ,
Diffe re n t ia l Lin e Re c e ive rs
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V to V )..................................................12V
Continuous Power Dissipation (T = +70°C)
A
CC
EE
Voltage on IN_, SHDN, REF, OUT,
SENSE, RG_.................................(V - 0.3V) to (V + 0.3V)
Short-Circuit Duration to Ground ........................................10sec
Input Current (IN_, RG_)...................................................±10mA
Output Current................................................................±120mA
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
EE
CC
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
(V = +5V, V = -5V, SHDN = 0V, 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 by PSR test
MIN
TYP
MAX
±5.5
8
UNITS
V
Operating Supply Voltage
Input Offset Voltage
±4.5
V
OS
V
= 0V
= 0V
= 0V
= 0V
0.6
5
mV
µV/°C
µA
IN
Input Offset Voltage Drift
Input Bias Current
TC
V
IN
VOS
I
B
V
9
20
IN
Input Offset Current
I
OS
V
0.1
1
2.5
µA
IN
Input Capacitance
C
pF
IN
IN
Differential Input Resistance
R
1
MΩ
MAX4144
MAX4145
MAX4146
-1.55
-2.8/G
-3.1/G
1.55
2.8/G
3.1/G
Differential Input Voltage Range
R
= 150Ω
V
V
L
Common-Mode Input Voltage
Range
V
CM
Guaranteed by CMR test
-2.8
2.8
5/MAX146
MAX4144
MAX4145
MAX4146
2
-1V ≤ V
≤ +1V,
OUT
Gain
A
V
1 + (1.4kΩ/R )
V/V
G
R
L
= 150Ω
10 + (14kΩ/R )
G
MAX4144
A
= 2V/V
0.02
0.5
2
2
5
2
5
V
A
V
= 1V/V
-1V ≤ V
OUT
MAX4145
MAX4146
Gain Error
Gain Drift
≤ +1V,
= 150Ω
A
V
= 10V/V
= 10V/V
= 100V/V
1.5
%
R
L
A
V
0.5
A
V
1.5
MAX4144
MAX4145
MAX4146
20
-1V ≤ V
≤ +1V,
OUT
5 + 15G
14 + 0.9G
80
ppm/°C
R
L
= 150Ω
Common-Mode Rejection
Power-Supply Rejection
Quiescent Supply Current
Shutdown Supply Current
CMR
PSR
V
CM
= ±2.8V
60
70
dB
dB
V = ±4.5V to ±5.5V
S
85
11
16
2
mA
mA
I
V
≥ 2V
≥ 2V
0.8
SHDN
SHDN
MAX4144
MAX4145
MAX4146
1.4
Shutdown Output Impedance
Output Voltage Swing
V
SHDN
1.4
kΩ
2
R
R
R
= 100Ω
±3.6
L
L
L
V
OUT
= 150Ω
= ∞
±3.1
±3.4
±3.7
±3.8
V
2
_______________________________________________________________________________________
Hig h -S p e e d , Lo w -Dis t o rt io n ,
Diffe re n t ia l Lin e Re c e ive rs
5/MAX146
DC ELECTRICAL CHARACTERISTICS (continued)
(V = +5V, V = -5V, SHDN = 0V, 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
80
TYP
MAX
UNITS
100
A
Output Current Drive
I
V
OUT
= ±1.7V
mA
OUT
-40°C ≤ T ≤ 0°C
60
A
SHDN High Threshold
SHDN Low Threshold
V
2
V
V
IH
V
IL
0.8
V
≤ 0.8V
≥ 2V
75
150
2
SHDN
SHDN Input Bias Current
I
µA
SHDN
V
SHDN
0.06
AC ELECTRICAL CHARACTERISTICS
(V = +5V, V = -5V, SHDN = 0V, 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
V
= 2V/V
130
MAX4145
A
= 1V/V
180
V
V
0.1V
≤
OUT
-3dB Bandwidth
BW
MHz
(-3dB)
RMS
A
V
= 10V/V
= 100V/V
= 2V/V
70
MAX4146
A
V
30
MAX4144
MAX4145
A
V
110
A
V
= 1V/V
180
V
=
OUT
Full-Power Bandwidth
0.1dB Bandwidth
FPBW
MHz
MHz
2Vp-p
A
V
= 10V/V
= 100V/V
= 2V/V
70
MAX4146
A
V
30
MAX4144
MAX4145
MAX4146
MAX4144
MAX4145
MAX4146
A
V
30
V
≤
OUT
BW
A
V
= 1V/V
90
(0.1dB)
0.1V
RMS
A
V
= 10V/V
50
12
Input Voltage Noise Density
Input Current Noise Density
Common-Mode Rejection
e
i
f = 1MHz
f = 1MHz
f = 10MHz
1.8 + (20/G)
nV/√Hz
pA/√Hz
dB
n
2.1 + (135/G)
1.7
70
n
MAX4144
MAX4145
MAX4146
MAX4144
MAX4145
MAX4146
MAX4144
MAX4145
MAX4146
MAX4144
MAX4145
MAX4146
CMR
SR
75
90
1000
600
800
23
Slew Rate
-2V ≤ V
≤ +2V
V/µs
ns
OUT
to 0.1%
20
17
-2V ≤ V
≤ +2V
OUT
Settling Time to 0.1%
t
S
36
to 0.01%
38
40
Enable Time from Shutdown
Disable Time to Shutdown
45
ns
µs
40
MAX4144
MAX4145
MAX4146
0.03
0.01
0.12
Differential Gain (Note 1)
DG
f = 3.58MHz
%
_______________________________________________________________________________________
3
Hig h -S p e e d , Lo w -Dis t o rt io n ,
Diffe re n t ia l Lin e Re c e ive rs
AC ELECTRICAL CHARACTERISTICS (continued)
(V = +5V, V = -5V, SHDN = 0V, 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
0.03
0.06
0.07
-90
MAX
UNITS
Differential Phase (Note 1)
DP
f = 3.58MHz
f = 10kHz,
Degrees
A
= 2V/V
= 1V/V
= 10V/V
= 2V/V
= 1V/V
= 10V/V
V
A
V
-92
V
OUT
= 2Vp-p
A
V
-82
Spurious-Free Dynamic Range
SFDR
dBc
A
V
-66
f = 5MHz,
= 2Vp-p
A
V
-67
V
OUT
A
V
-48
Note 1: Differential gain and phase are tested using a modulated ramp, 100 IRE (0.714V).
__________________________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s
(V = +5V, V = -5V, SHDN = 0V, R = 150Ω, T = +25°C, unless otherwise noted.)
L
CC
EE
A
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
5/MAX146
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.
FREQUENCY (A = +2)
V
MAX4146
SMALL-SIGNAL GAIN
vs. FREQUENCY (A = +100)
V
MAX4145
0.1dB GAIN FLATNESS vs.
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
100M
1G
100k
1M
10M
100M
1G
100k
1M
10M
100M
1G
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
4
_______________________________________________________________________________________
Hig h -S p e e d , Lo w -Dis t o rt io n ,
Diffe re n t ia l Lin e Re c e ive rs
5/MAX146
_____________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(V = +5V, V = -5V, SHDN = 0V, R = 150Ω, T = +25°C, unless otherwise noted.)
L
CC
EE
A
MAX4146
MAX4145
MAX4144
0.1dB GAIN FLATNESS vs.
LARGE-SIGNAL GAIN
LARGE-SIGNAL GAIN
FREQUENCY (A = +10)
V
vs. FREQUENCY (A = +1)
V
vs. FREQUENCY (A = +2)
V
0.5
0.4
4
3
5
4
3
2
1
V
OUT
= 2Vp-p
V
OUT
= 100mV
V
OUT
= 2Vp-p
RMS
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
MAX4146
MAX4146
SMALL-SIGNAL
SMALL-SIGNAL GAIN
LARGE-SIGNAL GAIN
PULSE RESPONSE (A = +2)
V
vs. FREQUENCY (A = +10)
V
vs. FREQUENCY (A = +100)
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)
V
MAX4146
SMALL-SIGNAL
PULSE RESPONSE (A = +10)
V
V
MAX4144/4146 TOC12
IN
GND
GND
IN
GND
IN
GND
GND
OUT
OUT
GND
OUT
TIME (10ns/div)
TIME (10ns/div)
TIME (10ns/div)
_______________________________________________________________________________________
5
Hig h -S p e e d , Lo w -Dis t o rt io n ,
Diffe re n t ia l Lin e Re c e ive rs
_____________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(V = +5V, V = -5V, SHDN = 0V, R = 150Ω, T = +25°C, unless otherwise noted.)
L
CC
EE
A
MAX4145
MAX4144
MAX4146
LARGE-SIGNAL
LARGE-SIGNAL
LARGE-SIGNAL
PULSE RESPONSE (A = +1)
V
PULSE RESPONSE (A = +2)
V
PULSE RESPONSE (A = +10)
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)
V
CLOSED-LOOP OUTPUT IMPEDANCE
MAX4144
DIFFERENTIAL GAIN AND PHASE
vs. FREQUENCY (A = +1)
V
100
10
1
0.01
0
-0.01
-0.02
-0.03
-0.04
IN
GND
GND
A = 2V/V
V
5/MAX146
0
100
OUT
IRE
0.04
0.03
0.02
0.01
0
A = 2V/V
V
0.1
-0.01
0.01
100k
1M
10M
100M
1G
0
100
TIME (10ns/div)
IRE
FREQUENCY (Hz)
MAX4146
OUTPUT SWING
MAX4145
DIFFERENTIAL GAIN AND PHASE
vs. LOAD RESISTANCE
DIFFERENTIAL GAIN AND PHASE
0.05
0
9.0
0.05
0
8.0
7.0
6.0
5.0
-0.05
-0.10
-0.15
-0.20
-0.05
-0.10
-0.15
A = 1V/V
A = 10V/V
V
V
0
100
0
100
IRE
IRE
0.02
0
0.08
0.06
0.04
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.10
4.0
3.0
A = 10V/V
V
A = 1V/V
V
-0.02
0
100
0
50
100
150
200
250
0
100
IRE
LOAD (Ω)
IRE
6
_______________________________________________________________________________________
Hig h -S p e e d , Lo w -Dis t o rt io n ,
Diffe re n t ia l Lin e Re c e ive rs
5/MAX146
_____________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(V = +5V, V = -5V, SHDN = 0V, R = 150Ω, T = +25°C, unless otherwise noted.)
L
CC
EE
A
MAX4144
MAX4146
MAX4145
HARMONIC DISTORTION
HARMONIC DISTORTION
HARMONIC DISTORTION
vs. FREQUENCY (A = +2)
V
vs. FREQUENCY (A = +10)
V
vs. FREQUENCY (A = +1)
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
2ND HARMONIC
3RD HARMONIC
3RD 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
-70
-80
-90
-100
2ND HARMONIC
2ND HARMONIC
3RD HARMONIC
3RD HARMONIC
3RD HARMONIC
-100
0
200
400
600
800
1k
100k
1M
10M
100M
0
200
400
600
800
1k
LOAD (Ω)
FREQUENCY (Hz)
LOAD (Ω)
MAX4146
MAX4144
MAX4146
5MHz HARMONIC DISTORTION
5MHz HARMONIC DISTORTION
5MHz HARMONIC DISTORTION
vs. LOAD (A = +100)
V
vs. OUTPUT SWING (A = +2)
V
vs. LOAD (A = +10)
V
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
0
0
V
OUT
= 2Vp-p
V
OUT
= 2Vp-p
-10
-10
-20
-30
-20
-30
-40
-50
-60
-70
-80
-90
-100
-40
-50
-60
-70
-80
-90
-100
2ND HARMONIC
3RD HARMONIC
2ND HARMONIC
3RD HARMONIC
3RD HARMONIC
2ND HARMONIC
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
Hig h -S p e e d , Lo w -Dis t o rt io n ,
Diffe re n t ia l Lin e Re c e ive rs
_____________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(V = +5V, V = -5V, SHDN = 0V, R = 150Ω, T = +25°C, unless otherwise noted.)
L
CC
EE
A
MAX4145
MAX4146
MAX4146
5MHz HARMONIC DISTORTION
5MHz HARMONIC DISTORTION
5MHz HARMONIC DISTORTION
vs. OUTPUT SWING (A = +1)
V
vs. OUTPUT SWING (A = +10)
V
vs. OUTPUT SWING (A = +100)
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
MAX4145
MAX4146
VOLTAGE NOISE DENSITY
VOLTAGE NOISE DENSITY
VOLTAGE NOISE DENSITY
vs. FREQUENCY (A = +2)
V
vs. FREQUENCY (A = +1)
V
vs. FREQUENCY (A = +10)
V
1000
100
10
100
10
1
100
10
1
5/MAX146
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
MAX4144
MAX4145
VOLTAGE NOISE DENSITY
CURRENT NOISE DENSITY
CURRENT NOISE DENSITY
vs. FREQUENCY (A = +100)
V
vs. FREQUENCY (A = +2)
V
vs. FREQUENCY (A = +1)
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
_______________________________________________________________________________________
Hig h -S p e e d , Lo w -Dis t o rt io n ,
Diffe re n t ia l Lin e Re c e ive rs
5/MAX146
_____________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(V = +5V, V = -5V, SHDN = 0V, R = 150Ω, T = +25°C, unless otherwise noted.)
L
CC
EE
A
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
0.1
0.1
100k
1M
10M
100M
10
100
1k
10k
100k
1M
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
MAX4144
MAX4145
COMMON-MODE REJECTION
COMMON-MODE REJECTION
vs. FREQUENCY (A = +1)
V
vs. FREQUENCY (A = +2)
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
RMS
CM
10M
1M
FREQUENCY (Hz)
100M
100k
1M
10M
100M
100k
FREQUENCY (Hz)
MAX4146
COMMON-MODE REJECTION
vs. FREQUENCY (A = +10)
V
SHUTDOWN RESPONSE TIME
MAX4144/6 TOC-45
110
100
90
80
70
60
50
40
30
20
10
SHDN
GND
OUT
GND
V
= 100mV
RMS
CM
10M
1M
FREQUENCY (Hz)
100M
100k
TIME (20µs/div)
_______________________________________________________________________________________
9
Hig h -S p e e d , Lo w -Dis t o rt io n ,
Diffe re n t ia l Lin e Re c e ive rs
P in De s c rip t io n
PIN
MAX4144
MAX4145
MAX4146
NAME
FUNCTION
14 SO
16 QSOP
14 SO
16 QSOP
14 SO
16 QSOP
1, 7
2
1, 7
2
1, 7
2
1, 7
2
1, 7
2
1, 7
2
V
Negative Power Supply
EE
IN-
N.C.
RG-
Inverting Input
3, 5, 10,
12
3, 5, 8, 9,
12,14
10, 12
3
12, 14
3
10, 12
3
12, 14
3
No Connect. Not internally connected.
Inverting Input for Gain-Set Resistor
—
4
—
4
Logic Input for Shutdown Circuitry. A logic
low enables the amplifier. A logic high
disables the amplifier.
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
V
CC
Positive Power Supply
Output Reference. Connect to ground for
normal operation.
9
11
13
15
9
11
13
15
9
11
13
15
REF
OUT
11
13
11
13
11
13
Output
Output Sense. Connect to OUT close to
the pin for normal operation.
SENSE
5/MAX146
mode noise, such as receiving T1 or xDSL transmis-
sions over a twisted-pair cable. Excellent differential
gain and phase, along with low noise, also suit them to
video applications and RF signal processing.
________________De t a ile d De s c rip t io n
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 sys-
tems.
For a complete differential transmission link, use the
MAX4144/MAX4145/MAX4146 a mp lifie rs with the
MAX4147 line driver, as shown in the Typical Applica-
tion Circuit.
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
a tta ins a -3d B b a nd wid th of 70MHz, a s le w ra te of
800V/µs, and CMR of 90dB at 10MHz when operating
with a closed-loop gain of +10V/V.
___________Ap p lic a t io n s In fo rm a t io n
Gro u n d in g , Byp a s s in g ,
a n d P C Bo a rd La yo u t
Adhere to the following high-frequency design tech-
niq ue s whe n d e s ig ning the PC b oa rd for the
MAX4144/MAX4145/MAX4146.
•
The printed circuit board should have at least two
layers: the signal layer and the ground plane.
•
Do not us e wire -wra p b oa rd s —the y a re too
inductive.
Diffe re ntia l inp uts ma ke the MAX4144/MAX4145/
MAX4146 id e a l for a p p lic a tions with hig h c ommon-
10 ______________________________________________________________________________________
Hig h -S p e e d , Lo w -Dis t o rt io n ,
Diffe re n t ia l Lin e Re c e ive rs
5/MAX146
•
•
Do not us e IC s oc ke ts —the y inc re a s e p a ra s itic
capacitance and inductance.
For a large differential input voltage (exceeding 4V), the
MAX4145/MAX4146 input bias current (at IN+ and IN-)
increases according to the following equation:
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.
V
- V - 10V
IN- F
IN+
(
)
Input Current =
R
G
•
•
Keep signal lines as short and as straight as possi-
ble. 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 10V
will c a us e only 4.3mA to flow—muc h le s s tha n the
10mA a b s olute ma ximum ra ting . Howe ve r, in the
The ground plane should be as free from voids as
possible.
MAX4145/MAX4146, R can be as low as 150Ω. Under
Ou t p u t S h o rt -Circ u it P ro t e c t io n
G
this condition, the absolute maximum input current rat-
ing might be exceeded if the differential input voltage
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
capability is an advantage in systems that transmit a
signal to several loads.
exceeds 5.5V (10mA x 150Ω + 10V ). In that case,
F
510Ω resistors can be placed at IN+ and IN- to limit the
current without degrading performance.
S h u t d o w n Mo d e
The MAX4144/MAX4145/MAX4146 can be put into low-
power 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).
In p u t P ro t e c t io n Circ u it ry
The MAX4144/MAX4145/MAX4146 include internal pro-
tection circuitry that prevents damage to the precision
input stage from large differential input voltages. This
p rote c tion c irc uitry c ons is ts of five b a c k-to-b a c k
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
S e t t in g Ga in (MAX4 1 4 5 /MAX4 1 4 6 )
The MAX4145/MAX4146 ’s gain is determined by a sin-
gle external resistor, R . The optimal gain range is from
G
+1V/V to +10V/V for the MAX4145 and +10V/V (R
=
G
open) to +100V/V for the MAX4146. The gain (in V/V) is
given in the following equations:
more than 10V , where V is the diode’s forward volt-
F
F
age drop (about 0.4V at +25°C).
IN-
IN-
R -
G
1.4k
MAX4144
MAX4145
MAX4146
R +
G
IN+
IN+
Figure 1. Input Protection Circuits
______________________________________________________________________________________ 11
Hig h -S p e e d , Lo w -Dis t o rt io n ,
Diffe re n t ia l Lin e Re c e ive rs
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
le a d to c ommon-mod e g a in e rrors . Common-mod e
gain is approximated by the following equation:
1.4kΩ
G = A = 1 +
(MAX4145)
(MAX4146)
V
R
G
∆R
- ∆R
SENSE
REF
14kΩ
AVCM =
G = A = 10 +
V
R + 700Ω
R
G
Substituting numbers for ∆R and ∆R
equation, we can see that if changes in ∆R
into this
SENSE
REF
Figure 2 shows the connection for R . R might simply
G
G
and
REF
be a resistor, or it can be a complex pole-zero pair for
filter and shaping applications (Figure 9). Use surface-
mount gain-setting components to ensure stability.
∆R
are equal, CMR is not degraded.
SENSE
Drivin g Ca p a c it ive Lo a d s
The MAX4144/MAX4145/MAX4146 provide maximum
AC p e rforma nc e whe n not d riving a n outp ut loa d
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
oc c ur. A s e c ond c onc e rn whe n d riving c a p a c itive
loads results from the amplifier’s output impedance,
Us in g REF a n d S ENS E
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 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 resis-
tance, which otherwise leads to an IR voltage error.
5/MAX146
Whe n us ing this te c hniq ue , ke e p the s e ns e line s ’
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:
5
4
1 700Ω + ∆R
700Ω + ∆R
REF
R + 700Ω + ∆R
REF
SENSE
A =
1 +
V
3
2
2
R
C = 15pF
L
1
0
700Ω + ∆R
REF
+
C = 5pF
R + 700Ω + ∆R
L
REF
-1
-2
-3
-4
-5
C = 10pF
L
where ∆R
and ∆R
are the SENSE and REF
REF
SENSE
tra c e imp e d a nc e s , re s p e c tive ly. R is 700Ω for the
MAX4144 and MAX4145, and 100Ω for the MAX4146.
100k
1M
10M
100M
1G
FREQUENCY (Hz)
Figure 4. MAX4144 Small-Signal Response with Capacitive
Load
12 ______________________________________________________________________________________
Hig h -S p e e d , Lo w -Dis t o rt io n ,
Diffe re n t ia l Lin e Re c e ive rs
5/MAX146
whic h a p p e a rs ind uc tive a t hig h fre q ue nc ie s . This
tive values, bandwidth is dominated by the RC network
formed by R and C ; 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.
ind uc ta nc e forms a n L-C re s ona nt c irc uit with the
capacitive load, which causes peaking in the frequency
response and degrades the amplifier’s phase margin.
ISO
L
The MAX4144/MAX4145/MAX4146 d rive c a p a c itive
loads up to 25pF without oscillation. However, some
peaking may occur in the frequency domain (Figure 4).
Tw is t e d -P a ir Lin e Re c e ive r
The MAX4144/MAX4145/MAX4146 are well suited as
re c e ive rs in twis te d -p a ir xDSL or NTSC/PAL vid e o
a p p lic a tions . The s ta nd a rd 24AWG te le p hone wire
widely used in these applications is a lossy medium for
hig h-fre q ue nc y s ig na ls . The los s e s in NTSC vid e o
applications are almost 15dB per 1000 feet (Figure 8).
To drive larger capacitance and reduce ringing, add an
isolation resistor (R ) between 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 7). 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
15
10
5
A = 10V/V
V
18
16
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
Hig h -S p e e d , Lo w -Dis t o rt io n ,
Diffe re n t ia l Lin e Re c e ive rs
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.
than the low-frequency loss. The losses can be com-
pensated 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.
The MAX4145/MAX4146, with va ria b le g a in 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
V
CC
V
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
1
0.1µF
V
EE
Figure 9. Circuit for Transmitting NTSC/PAL Video Over 1000 Feet of Twisted-Pair Telephone Line
__________________________________________________Typ ic a l Ap p lic a t io n Circ u it
R
T
R
T
IN+
IN-
SENSE
SENSE+
IN-
75Ω
COAX
75Ω
OUT+
OUT-
V
OUT
MAX4144
MAX4147
SENSE-
OUT
IN+
R
T
75Ω
REF
R
T
TWISTED-PAIR-TO-COAX CABLE CONVERTER
14 ______________________________________________________________________________________
Hig h -S p e e d , Lo w -Dis t o rt io n ,
Diffe re n t ia l Lin e Re c e ive rs
5/MAX146
P in Co n fig u ra t io n s
TOP VIEW
MAX4144
R
MAX4145
MAX4146
R
V
EE
1
V
EE
1
14
V
CC
14 V
CC
R
SENSE
R
SENSE
IN-
2
3
4
13 SENSE
IN-
RG-
2
3
4
13 SENSE
N.C.
N.C.
12
N.C.
12
R
R
F
F
R
G
11 OUT
10 N.C.
11 OUT
10 N.C.
SHDN
N.C.
SHDN
RG+
IN+
R
R
F
R
F
R
5
6
7
5
6
7
R
REF
R
REF
IN+
9
8
REF
9
8
REF
V
EE
V
CC
V
EE
V
CC
SO
SO
MAX4144
R
MAX4145
MAX4146
R
V
EE
1
V
EE
1
16
V
CC
16
V
CC
R
SENSE
R
SENSE
IN-
N.C.
2
3
4
15 SENSE
IN-
RG-
2
3
4
15 SENSE
N.C.
N.C.
14
14
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+
IN+
R
R
F
R
F
R
5
6
7
8
5
6
7
8
R
REF
R
REF
IN+
V
EE
10
9
V
V
EE
10
9
V
CC
CC
N.C.
N.C
N.C.
N.C.
QSOP
QSOP
___________________Ch ip In fo rm a t io n
TRANSISTOR COUNT: 237
SUBSTRATE CONNECTED TO V
EE
______________________________________________________________________________________ 15
Hig h -S p e e d , Lo w -Dis t o rt io n ,
Diffe re n t ia l Lin e Re c e ive rs
________________________________________________________P a c k a g e In fo rm a t io n
5/MAX146
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 ____________________Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 4 0 8 -7 3 7 -7 6 0 0
© 1998 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
相关型号：
©2020 ICPDF网 联系我们和版权申明