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ADA4922-1 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADA4922-1
Beschreibung Differential 18-Bit ADC Driver
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 20 Seiten
ADA4922-1 Datasheet, Funktion
www.DataSheet4U.com
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.






ADA4922-1 Datasheet, Funktion
ADA4922-1
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Table 5. Pin Function Descriptions
Pin No.
Mnemonic
1 NC
2 REF
3 VS+
4 OUT+
5 OUT−
6 VS−
7 DIS
8 IN
NC 1
ADA4922-1
8 IN
REF 2
7 DIS
VS+ 3
6 VS–
OUT+ 4
5 OUT–
NC = NO CONNECT
Figure 4. Pin Configuration
Description
No Internal Connection
Reference Voltage for Single-Ended Input Signal
Positive Power Supply
Noninverting Side of Differential Output
Inverting Side of Differential Output
Negative Power Supply
Disable
Single-Ended Signal Input
Rev. 0 | Page 6 of 20

6 Page









ADA4922-1 pdf, datenblatt
ADA4922-1
12.0
11.5
11.0
10.5
10.0
9.5
9.0
VS = ±12V
8.5
8.0
7.5
7.0 VS = ±5V
6.5
6.0
–40
–20
0
20 40 60 80
TEMPERATURE (°C)
Figure 34. Power Supply Current vs. Temperature
3.0
2.5
2.0
1.5
1.0
–40
INPUT BIAS CURRENT, VS = ±5V
REFERENCE BIAS CURRENT, VS = ±5V
INPUT BIAS CURRENT, VS = ±12V
REFERENCE BIAS CURRENT, VS = ±12V
–20 0
20 40
TEMPERATURE (°C)
60
Figure 35. Input Bias Current vs. Temperature
80
VO, dm = 2V p-p
VDIS = –8.5V
DIS INPUT
VDIS = –10.5V
VO, dm
40μs/DIV
Figure 36. Disable Turn-On Time
10
9 ISUPPLY = ±12V
8
7
ISUPPLY = ±5V
6
5
4
3
2
1
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
DIS INPUT VOLTAGE WITH RESPECT TO VS– (V)
Figure 37. Power Supply Current vs. Disable Input Voltage
5
4
3
2 IB = ±12V
1
0
–1
–2 IB = ±5V
–3
–4
–5
0 24
6 8 10 12 14 16 18 20 22 24
INPUT VOLTAGE WITH RESPECT TO VS– (V)
Figure 38. Input Bias Current vs. Input Voltage
VDIS = –8.5V
VO, dm = 2V p-p
VO, dm
VDIS = –10.5V
DIS INPUT
40μs/DIV
Figure 39. Disable Turn-Off Time
Rev. 0 | Page 12 of 20

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