Low Cost, High Speed
Differential Amplifier
AD8132
FEATURES
CONNECTION DIAGRAM
High speed
350 MHz, −3 dB bandwidth
1200 V/μs slew rate
Resistor set gain
AD8132
–IN
1
2
3
4
8
7
6
5
+IN
NC
V
OCM
V+
V–
+OUT
–OUT
Internal common-mode feedback
Improved gain and phase balance: −68 dB @ 10 MHz
Separate input to set the common-mode output voltage
Low distortion: −99 dBc SFDR @ 5 MHz, 800 Ω load
Low power: 10.7 mA @ 5 V
NC = NO CONNECT
Figure 1.
The AD8132 is also used as a differential driver for the trans-
mission of high speed signals over low cost twisted pair or coaxial
cables. The feedback network can be adjusted to boost the high
frequency components of the signal. The AD8132 is used for either
analog or digital video signals or for other high speed data trans-
mission. The AD8132 is capable of driving either a Category 3
or Category 5 twisted pair or coaxial cable with minimal line
attenuation. The AD8132 has considerable cost and performance
improvements over discrete line driver solutions.
Power supply range: +2.7 V to 5.5 V
Fully AEC-Q100 qualified (AD8132W)
APPLICATIONS
Low power differential ADC drivers
Differential gain and differential filtering
Video line drivers
Differential in/out level shifting
Single-ended input to differential output drivers
Active transformers
Automotive driver assistance
Automotive infotainment
Differential signal processing reduces the effects of ground noise
that plagues ground-referenced systems. The AD8132 can be used
for differential signal processing (gain and filtering) throughout a
signal chain, easily simplifying the conversion between differential
and single-ended components.
The AD8132W is the automotive grade version, qualified for
125°C operation per the AEC-Q100. See the Automotive
Products section for more details.
GENERAL DESCRIPTION
The AD8132 is a low cost differential or single-ended input to
differential output amplifier with resistor set gain. The AD8132
is a major advancement over op amps for driving differential input
ADCs or for driving signals over long lines. The AD8132 has a
unique internal feedback feature that provides output gain and
phase matching balanced to −68 dB at 10 MHz, suppressing
harmonics and reducing radiated EMI.
The AD8132 is available in both 8-lead SOIC and 8-lead MSOP
packages for operation over the extended industrial temperature
range of −40°C to +125°C.
6
V
= ±5V
S
G = +1
3
0
V
R
= 2V p-p
= 499Ω
O, dm
Manufactured using the next-generation of Analog Devices, Inc.,
XFCB bipolar process, the AD8132 has a −3 dB bandwidth of
350 MHz and delivers a differential signal with −99 dBc SFDR
at 5 MHz, despite its low cost. The AD8132 eliminates the need for
a transformer with high performance ADCs, preserving the low
frequency and dc information. The common-mode level of the
differential output is adjustable by applying a voltage on the
L, dm
–3
–6
–9
–12
V
OCM pin, easily level shifting the input signals for driving single-
supply ADCs. Fast overload recovery preserves sampling accuracy.
1
10
100
1k
FREQUENCY (MHz)
Figure 2. Large Signal Frequency Response
Rev. I
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 registeredtrademarks arethe property of their respective owners.
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 ©2000–2009 Analog Devices, Inc. All rights reserved.
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