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Analog Devices Semiconductor Electronic Components Datasheet

ADA4922-1 Datasheet

Differential 18-Bit ADC Driver

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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 max
Low input bias current: 3.5 μA max
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 @ 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
3 mm × 3 mm LFCSP
8-lead SOIC_EP
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
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.
High Voltage, Differential
18-Bit ADC Driver
ADA4922-1
FUNCTIONAL BLOCK DIAGRAM
NC 1
ADA4922-1
8 IN
REF 2
7 DIS
VS+ 3
6 VS–
OUT+ 4
5 OUT–
NC = NO CONNECT
Figure 1.
–84
–87 RL = 2kΩ
–90
SECOND HARMONIC
THIRD HARMONIC
–93
–96 VS = ±5V, VO, dm = 12V p-p
–99
–102
–105
–108
–111
–114
–117
VS = ±12V, VO, dm = 40V p-p
–120
1
10
FREQUENCY (kHz)
100
Figure 2. Harmonic Distortion for Various Power Supplies
The ADA4922-1 is manufactured on ADI’s 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.
Rev. 0
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
© 2005 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

ADA4922-1 Datasheet

Differential 18-Bit ADC Driver

No Preview Available !

ADA4922-1
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
Thermal Resistance ...................................................................... 5
ESD Caution.................................................................................. 5
Pin Configuration and Function Descriptions............................. 6
Typical Performance Characteristics ............................................. 7
REVISION HISTORY
10/05—Revision 0: Initial Version
Theory of Operation ...................................................................... 14
Applications..................................................................................... 16
ADA4922-1 Differential Output Noise Model .......................... 16
Using the REF Pin ...................................................................... 16
Internal Feedback Network Power Dissipation...................... 17
Disable Feature ........................................................................... 17
Driving a Differential Input ADC............................................ 17
Printed Circuit Board Layout Considerations ....................... 18
Outline Dimensions ....................................................................... 19
Ordering Guide .......................................................................... 20
Rev. 0 | Page 2 of 20


Part Number ADA4922-1
Description Differential 18-Bit ADC Driver
Maker Analog Devices
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