High Voltage, Differential

18-Bit ADC Driver

Data Sheet

ADA4922-1

Rev. A

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FEATURES

Single-ended-to-differential conversion

Low distortion (VO, dm = 40 V p-p)

−99 dBc HD at 100 kHz

Low differential output referred noise: 12 nV/√Hz

High input impedance: 11 MΩ

Fixed gain of 2

No external gain components required

Low output-referred offset voltage: 1.1 mV maximum

Low input bias current: 3.5 μA maximum

Wide supply range

5 V to 26 V

Can produce differential output signals in excess of 40 V p-p

High speed

38 MHz, −3 dB bandwidth at 0.2 V p-p differential output

Fast settling time

200 ns to 0.01% for 12 V step on ±5 V supplies

Disable feature

Available in space-saving, thermally enhanced packages

8-lead, 3 mm × 3 mm LFCSP

8-lead SOIC

Low supply current: IS = 10 mA on ±12 V supplies

APPLICATIONS

High voltage data acquisition systems

Industrial instrumentation

Spectrum analysis

ATE

Medical instruments

GENERAL DESCRIPTION

The ADA4922-1 is a differential driver for 16-bit to 18-bit

analog-to-digital converters (ADCs) that have differential input

ranges up to ±20 V. Configured as an easy-to-use, single-ended-

to-differential amplifier, the ADA4922-1 requires no external

components to drive ADCs. The ADA4922-1 provides essential

benefits such as low distortion and high SNR that are required

for driving ADCs with resolutions up to 18 bits.

With a wide supply voltage range (5 V to 26 V), high input

impedance, and fixed differential gain of 2, the ADA4922-1 is

designed to drive ADCs found to in a variety of applications,

including industrial instrumentation.

FUNCTIONAL BLOCK DIAGRAM

NIC

REF

VS+

OUT+

DIS

IN

VS–

OUT–

NOTES

1. EXPOSED PAD MUST BE CONNECTED TO GND.

2. NIC = NO INTERAL CONNECTION.

3

4

1

2

6

5

8

7

ADA4922-1

TOP VIEW

Figure 1.

The ADA4922-1 is manufactured on Analog Devices, Inc.,

proprietary, second-generation XFCB process that enables the

amplifier to achieve excellent noise and distortion performance

on high supply voltages.

The ADA4922-1 is available in an 8-lead 3 mm × 3 mm LFCSP

as well as an 8-lead SOIC package. Both packages are equipped

with an exposed paddle for more efficient heat transfer. The

ADA4922-1 is rated to work over the extended industrial

temperature range, −40°C to +85°C.

–84

–120

FREQUENCY (kHz)

1

10

100

–87

–90

–93

–102

–99

–96

–105

–108

–111

–114

–117

SECOND HARMONIC

THIRD HARMONIC

RL = 2k

VS = 12V, VO, dm = 40V p-p

VS = 5V, VO, dm = 12V p-p

Figure 2. Harmonic Distortion for Various Power Supplies