ANALOG DEVICES ADA4932-1, ADA4932-2 Service Manual

Low Power

–

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
Input common-mode range shifted down by 1 V
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-ended­to-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. A

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 registered trademarks are the property of their respective owners.

BE

Differential ADC Driver

ADA4932-1/ADA4932-2

FUNCTIONAL BLOCK DIAGRAMS

1–FB

2+IN

3–IN

4+FB

1–IN1
2+FB1
3+V

S1

4+V

S1

5–FB2
6+IN2

40

V

= 2V p-p

–50

–60

–70

–80

–90

–100

–110

HARMONIC DIST ORTION (dBc)

–120

–130

–140

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.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] ©2008–2009 Analog Devices, Inc. All rights reserved.

OUT, dm

HD2, G = 1
HD3, G = 1
HD2, G = 2
HD3, G = 2

100k 1M 10M 100M

S

S

S

S

–V

–V

–V

–V

14

13

15

16

ADA4932-1

5

6

S

S

+V

+V

12 PD

11 –OUT

10 +OUT

9V

8

7

S

S

+V

+V

Figure 1. ADA4932-1

S1

S1

–V

–V

–FB1

+IN1

24

ADA4932-2

7

–IN2

PD1

–OUT1

20

19

21

22

23

18 + OUT1
17 V
16 – V
15

14
13 –O UT2

9

8

11

12

10

S2

S2

+V

+V

OCM2

+FB2

V

+OUT2

Figure 2. ADA4932-2

FREQUENCY (Hz)

–V
PD2

OCM

OCM1

S2
S2

07752-001

07752-002

07752-003