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What is AD8131?

This electronic component, produced by the manufacturer "Analog Devices", performs the same function as "Low-Cost / High-Speed Differential Driver".


AD8131 Datasheet PDF - Analog Devices

Part Number AD8131
Description Low-Cost / High-Speed Differential Driver
Manufacturers Analog Devices 
Logo Analog Devices Logo 


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FEATURES
High speed
400 MHz, −3 dB full power bandwidth
2000 V/μs slew rate
Fixed gain of 2 with no external components
Internal common-mode feedback to improve gain and phase
balance: −60 dB @ 10 MHz
Separate input to set the common-mode output voltage
Low distortion: 68 dB SFDR @ 5 MHz 200 Ω load
Power supply range +2.7 V to ±5 V
APPLICATIONS
Video line driver
Digital line driver
Low power differential ADC driver
Differential in/out level shifting
Single-ended input to differential output driver
GENERAL DESCRIPTION
The AD8131 is a differential or single-ended input to
differential output driver requiring no external components for
a fixed gain of 2. The AD8131 is a major advancement over op
amps for driving signals over long lines or for driving
differential input ADCs. The AD8131 has a unique internal
feedback feature that provides output gain and phase matching
that are balanced to −60 dB at 10 MHz, reducing radiated EMI
and suppressing harmonics. Manufactured on the Analog
Devices, Inc. next generation XFCB bipolar process, the
AD8131 has a −3 dB bandwidth of 400 MHz and delivers a
differential signal with very low harmonic distortion.
The AD8131 is a differential driver for the transmission of
high-speed signals over low-cost twisted pair or coax cables.
The AD8131 can be used for either analog or digital video
signals or for other high-speed data transmission. The AD8131
driver is capable of driving either Cat3 or Cat5 twisted pair or
coax with minimal line attenuation. The AD8131 has
considerable cost and performance improvements over discrete
line driver solutions.
The AD8131 can replace transformers in a variety of applications,
preserving low frequency and dc information. The AD8131 does
not have the susceptibility to magnetic interference and hysteresis
of transformers. It is smaller, easier to work with, and has the high
reliability associated with ICs.
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
Low Cost, High Speed
Differential Driver
AD8131
FUNCTIONAL BLOCK DIAGRAM
–DIN 1
VOCM 2
750Ω
750Ω
8 +DIN
7 NC
V+ 3
+OUT 4
1.5kΩ
1.5kΩ
AD8131
6 V–
5 –OUT
NC = NO CONNECT
Figure 1.
–20
ΔVOUT, dm = 2V p-p
ΔVOUT, cm/ΔVOUT, dm
–30
–40
–50
VS = +5V
–60
–70
VS = ±5V
–80
1
10 100
FREQUENCY (MHz)
1000
Figure 2. Output Balance Error vs. Frequency
The AD8131’s differential output also helps balance the input
for differential ADCs, optimizing the distortion performance of
the ADCs. The common-mode level of the differential output is
adjustable by a voltage on the VOCM pin, easily level-shifting the
input signals for driving single-supply ADCs with dual supply
signals. Fast overload recovery preserves sampling accuracy.
The AD8131 is available in both SOIC and MSOP packages for
operation over −40°C to +125°C.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2005 Analog Devices, Inc. All rights reserved.

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AD8131 equivalent
AD8131
±DIN TO ±OUT SPECIFICATIONS
25°C, VS = 5 V, VOCM = 2.5 V, G = 2, RL, dm = 200 Ω, unless otherwise noted. Refer to Figure 5 and Figure 39 for test setup and label
descriptions. All specifications refer to single-ended input and differential outputs, unless otherwise noted.
Table 3.
Parameter
DYNAMIC PERFORMANCE
−3 dB Large Signal Bandwidth
−3 dB Small Signal Bandwidth
Bandwidth for 0.1 dB Flatness
Slew Rate
Settling Time
Overdrive Recovery Time
NOISE/HARMONIC PERFORMANCE
Second Harmonic
Third Harmonic
IMD
IP3
Voltage Noise (RTO)
Differential Gain Error
Differential Phase Error
INPUT CHARACTERISTICS
Input Resistance
Input Capacitance
Input Common-Mode Voltage
CMRR
OUTPUT CHARACTERISTICS
Offset Voltage (RTO)
Output Voltage Swing
Linear Output Current
Gain
Output Balance Error
Conditions
VOUT = 2 V p-p
VOUT = 0.2 V p-p
VOUT = 0.2 V p-p
VOUT = 2 V p-p, 10% to 90%
0.1%, VOUT = 2 V p-p
VIN = 5 V to 0 V Step
VOUT = 2 V p-p, 5 MHz, RL, dm = 200 Ω
VOUT = 2 V p-p, 20 MHz, RL, dm = 200 Ω
VOUT = 2 V p-p, 5 MHz, RL, dm = 800 Ω
VOUT = 2 V p-p, 20 MHz, RL, dm = 800 Ω
VOUT = 2 V p-p, 5 MHz, RL, dm = 200 Ω
VOUT = 2 V p-p, 20 MHz, RL, dm = 200 Ω
VOUT = 2 V p-p, 5 MHz, RL, dm = 800 Ω
VOUT = 2 V p-p, 20 MHz, RL, dm = 800 Ω
20 MHz, RL, dm = 800 Ω
20 MHz, RL, dm = 800 Ω
f = 20 MHz
NTSC, RL, dm = 150 Ω
NTSC, RL, dm = 150 Ω
Single-ended input
Differential input
ΔVOUT, dm/ΔVIN, cm; ΔVIN, cm = ±0.5 V
VOS, dm = VOUT, dm; VDIN+ = VDIN− = VOCM = 2.5 V
TMIN to TMAX variation
VOCM = float
TMIN to TMAX variation
Maximum ΔVOUT; single-ended output
ΔVOUT, dm/ΔVIN, dm; ΔVIN, dm = ±0.5 V
ΔVOUT, cm/ΔVOUT, dm; ΔVOUT, dm = 1 V
Min Typ
Max Unit
385
285
65
1600
18
5
MHz
MHz
MHz
V/μs
ns
ns
−67 dBc
−56 dBc
−94 dBc
−77 dBc
−74 dBc
−67 dBc
−95 dBc
−74 dBc
−51 dBc
29 dBm
25 nV/√Hz
0.02 %
0.08 degrees
1.125
1.5
1
−1.0 to +4.0
−70
pF
V
dB
±3
±8
±4
±10
1.0 to 3.7
45
1.96 2
−62
±7 mV
μV/°C
mV
μV/°C
V
mA
2.04 V/V
dB
Rev. B | Page 5 of 20


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