AD8132 Datasheet, PDF (1/20 Pages) Analog Devices – Low-Cost, High-Speed Differential Amplifier

a
FEATURES
High Speed
350 MHz –3 dB Bandwidth
1200 V/␮s Slew rate
Resistor-Settable Gain
Internal Common-Mode Feedback to Improve 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 ⍀ Load
Low Power 10.7 mA @ 5 V
Power Supply Range +2.7 V to ؎5.5 V
APPLICATIONS
Low Power Differential ADC Driver
Differential Gain and Differential Filtering
Video Line Driver
Differential In/Out Level-Shifting
Single-Ended Input to Differential Output Driver
Active Transformer
Low-Cost, High-Speed
Differential Amplifier
AD8132
FUNCTIONAL BLOCK DIAGRAM
AD8132
–IN 1
8 +IN
V_OCM 2
V+ 3
7 NC
+
6 V–
+OUT 4
5 –OUT
NC = NO CONNECT
GENERAL DESCRIPTION
The AD8132 is a low-cost differential or single-ended input to
differential output amplifier with resistor-settable gain. The
AD8132 is a major advancement over op amps for driving differ-
ential 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.
Manufactured on ADI’s next generation of XFCB bipolar pro-
cess, 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 V_OCM
pin, easily level-shifting the input signals for driving single supply
ADCs. Fast overload recovery preserves sampling accuracy.
The AD8132 can also be used as a differential driver for the
transmission 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 can
be used for either analog or digital video signals or for other high-
speed data transmission. The AD8132 is capable of driving either
cat3 or cat5 twisted pair or coaxial with minimal line attenu-
ation. The AD8132 has considerable cost and performance
improvements over discrete line driver solutions.
Differential signal processing reduces the effects of ground noise
which plagues ground referenced systems. The AD8132 can be
used for differential signal processing (gain and filtering) through-
out a signal chain, easily simplifying the conversion between
differential and single-ended components.
The AD8132 is available in both SOIC and µSOIC packages for
operation over –40°C to +85°C temperatures.
6
V_S = ؎5V
G=1
3 _{VO,dm = 2V p-p}
R_L,dm = 499⍀
0
–3
–6
–9
–12
1
10
100
1k
FREQUENCY – MHz
Figure 1. Large Signal Frequency Response
REV. 0
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