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ADA4922-1 Datenblatt(Datasheet) 1 Page - Analog Devices

Teile-Nr. ADA4922-1
Beschreibung  High Voltage, Differential 18-Bit ADC Driver
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Hersteller  AD [Analog Devices]
Homepage  http://www.analog.com
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High Voltage, Differential
18-Bit ADC Driver
ADA4922-1
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.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.
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
FUNCTIONAL BLOCK DIAGRAM
DIS
NC = NO CONNECT
4
3
2
1
IN
OUT–
OUT+
VS+
REF
NC
VS–
7
8
5
6
ADA4922-1
Figure 1.
–84
–120
FREQUENCY (kHz)
1
10
100
–87
–90
–93
–102
–99
–96
–105
–108
–111
–114
–117
SECOND HARMONIC
THIRD HARMONIC
RL = 2kΩ
VS = ±12V, VO, dm = 40V p-p
VS = ±5V, VO, dm = 12V p-p
Figure 2. Harmonic Distortion for Various Power Supplies
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.
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.




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