ADA4922-1_16 Datasheet, PDF (1/20 Pages) Analog Devices – High Voltage, Differential 18-Bit ADC Driver

Data Sheet
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.
High Voltage, Differential
18-Bit ADC Driver
ADA4922-1
FUNCTIONAL BLOCK DIAGRAM
ADA4922-1
TOP VIEW
NIC 1
REF 2
V_S+ 3
OUT+ 4
8 IN
7 DIS
6 V_S–
5 OUT–
NOTES
1. EXPOSED PAD MUST BE CONNECTED TO GND.
2. NIC = NO INTERAL CONNECTION.
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
–87 ^{RL = 2k}
–90
SECOND HARMONIC
THIRD HARMONIC
–93
–96
V_S = 5V, V_{O, dm} = 12V p-p
–99
–102
–105
–108
–111
–114
–117
–120
1
V_S = 12V, V_{O, dm} = 40V p-p
10
100
FREQUENCY (kHz)
Figure 2. Harmonic Distortion for Various Power Supplies
Rev. A
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