Low Power

Differential ADC Driver

ADA4932-1/ADA4932-2

Rev. A

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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.

FUNCTIONAL BLOCK DIAGRAMS

1

–FB

2

+IN

3

–IN

4

+FB

11 –OUT

12 PD

10 +OUT

ADA4932-1

Figure 1. ADA4932-1

ADA4932-2

1

–IN1

2

+FB1

3

4

5

–FB2

6

+IN2

18 +OUT1

14 PD2

13 –OUT2

Figure 2. ADA4932-2

–140

–130

–120

–110

–100

–90

–80

–70

–60

–50

–40

100k

1M

10M

100M

FREQUENCY (Hz)

HD2, G = 1

HD3, G = 1

HD2, G = 2

HD3, G = 2

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.