ADA4932-1/ADA4932-2: Low Power Differential ADC Driver Data Sheet0 pages

Low Power
Differential ADC Driver
ADA4932-1/ADA4932-2

Data Sheet

ADC drivers
Single-ended-to-differential converters
IF and baseband gain blocks
Differential buffers
Line drivers

ADA4932-1

12 PD

07752-001

+VS 8

9 VOCM

+VS 7

10 +OUT

+FB 4

+VS 6

11 –OUT

–IN 3

+VS 5

+IN 2

Figure 1. ADA4932-1

499Ω

VIN

VOCM
499Ω

5V
499Ω
33Ω

+
ADA4932-1
–

499Ω

56pF
33Ω

IN– VDD1 VDD2
AD7626
IN+

56pF

GND

DIGITAL
OUTPUTS

REF

07752-102

5V

Figure 2. ADC Driver Test Circuit (Data Shown in Figure 3)
0
–20
–40
AMPLITUDE (dB)

APPLICATIONS

13 –VS

16 –VS
–FB 1

14 –VS

FUNCTIONAL BLOCK DIAGRAM

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 at 10 MHz
90 dB SFDR at 20 MHz
Low input voltage noise: 3.6 nV/√Hz
±0.5 mV typical input offset voltage
Externally adjustable gain
Can be used with gains less than 1
Differential-to-differential or single-ended-to-differential
operation
Adjustable output common-mode voltage
Input common-mode range shifted down by 1 VBE
Wide supply range: +3 V to ±5 V
Available in 16-lead and 24-lead LFCSP packages

15 –VS

FEATURES

–60
–80
–100
–120
–140

–180

0

1.25

2.50

3.75

5.00

FREQUENCY (MHz)

07752-103

–160

Figure 3. AD7626 Output, 64,000 Point, FFT Plot −1 dBFS Amplitude
2.40173 MHz Input Ton, 10.000 MSPS Sampling Rate

GENERAL DESCRIPTION
The ADA4932 family 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
family 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 family, differential gain configurations are
easily realized with a simple external four-resistor feedback
network that determines the closed-loop gain of the amplifier.

Rev. D

The ADA4932 family 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 family make it well
suited for a wide variety of data acquisition and signal processing
applications.
The ADA4932-1 is available in a 16-lead LFCSP and the
ADA4932-2 is available in a 24-lead LFCSP. The pinout has been
optimized to facilitate PCB layout and minimize distortion. The
ADA4932 family is 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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