ADA4932-1 Datasheet, PDF (1/28 Pages) Analog Devices – Low Power Differential ADC Driver

FEATURES
High performance at low power
High speed
−3 dB bandwidth of 560 MHz, G = 1
0.1 dB gain flatness to 300 MHz
Slew rate: 2800 V/µs, 25% to 75%
Fast 0.1% settling time of 9 ns
Low power: 9.6 mA per amplifier
Low harmonic distortion
100 dB SFDR @ 10 MHz
90 dB SFDR @ 20 MHz
Low input voltage noise: 3.6 nV/√Hz
±0.5 mV typical input offset voltage
Externally adjustable gain
Can be used with fractional differential gains
Differential-to-differential or single-ended-to-differential
operation
Adjustable output common-mode voltage
Wide supply range: +3 V to ±5 V
Available in 16-lead and 24-lead LFCSP packages
APPLICATIONS
ADC drivers
Single-ended-to-differential converters
IF and baseband gain blocks
Differential buffers
Line drivers
GENERAL DESCRIPTION
The ADA4932-x is the next generation AD8132 with higher
performance, and lower noise and power consumption. It is an
ideal choice for driving high performance ADCs as a single-ended-
to-differential or differential-to-differential amplifier. The output
common-mode voltage is user adjustable by means of an internal
common-mode feedback loop, allowing the ADA4932-x output
to match the input of the ADC. The internal feedback loop also
provides exceptional output balance as well as suppression of
even-order harmonic distortion products.
With the ADA4932-x, differential gain configurations are easily
realized with a simple external four-resistor feedback network that
determines the closed-loop gain of the amplifier.
The ADA4932-x is fabricated using the Analog Devices, Inc.,
proprietary silicon-germanium (SiGe) complementary bipolar
process, enabling it to achieve low levels of distortion and noise
at low power consumption. The low offset and excellent dynamic
performance of the ADA4932-x make it well suited for a wide
variety of data acquisition and signal processing applications.
Rev. 0
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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
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Low Power
Differential ADC Driver
ADA4932-1/ADA4932-2
FUNCTIONAL BLOCK DIAGRAMS
–FB 1
+IN 2
–IN 3
+FB 4
ADA4932-1
12 PD
11 –OUT
10 +OUT
9 V_OCM
Figure 1. ADA4932-1
–IN1 1
+FB1 2
+V_S1 3
+V_S1 4
–FB2 5
+IN2 6
ADA4932-2
18 +OUT1
17 V_OCM1
16 –V_S2
15 –VS2
14 PD2
13 –OUT2
Figure 2. ADA4932-2
–40
V_{OUT, dm} = 2V p-p
–50
HD2, G = 1
–60
HD3, G = 1
HD2, G = 2
–70
HD3, G = 2
–80
–90
–100
–110
–120
–130
–140
100k
1M
10M
FREQUENCY (Hz)
100M
Figure 3. Harmonic Distortion vs. Frequency at Various Gains
The ADA4932-x is available in a Pb-free, 3 mm × 3 mm 16-lead
LFCSP (ADA4932-1, single) or a Pb-free, 4 mm × 4 mm 24-lead
LFCSP (ADA4932-2, dual). The pinout has been optimized to
facilitate PCB layout and minimize distortion. The ADA4932-1
and the ADA4932-2 are specified to operate over the −40°C to
+105°C temperature range; both operate on supplies between
+3 V and ±5 V.
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