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AD7631BSTZ Datasheet(PDF) 1 Page - Analog Devices

Part # AD7631BSTZ
Description  18-Bit, 250 kSPS, Differential Programmable Input PulSAR짰 ADC
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7631BSTZ Datasheet(HTML) 1 Page - Analog Devices

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18-Bit, 250 kSPS, Differential
Programmable Input PulSAR® ADC
AD7631
Rev. A
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
©2007–2011 Analog Devices, Inc. All rights reserved.
FEATURES
Multiple pins/software-programmable input ranges
+5 V (10 V p-p), +10 V (20 V p-p), ±5 V (20 V p-p),
±10 V (40 V p-p)
Pins or serial SPI-compatible input ranges/mode selection
Throughput: 250 kSPS
INL: ±1.5 LSB typical, ±2.5 LSB maximum (±9.5 ppm of FSR)
18-bit resolution with no missing codes
Dynamic range: 102.5 dB
SNR: 101 dB @ 2 kHz
THD: −112 dB @ 2 kHz
iCMOS® process technology
5 V internal reference: typical drift 3 ppm/°C; TEMP output
No pipeline delay (SAR architecture)
Parallel (18-/16-/8-bit bus) and serial 5 V/3.3 V interface
SPI-/QSPI™-/MICROWIRE™-/DSP-compatible
Power dissipation
73 mW @ 250 kSPS
10 mW @ 1 kSPS
Pb-free, 48-lead LQFP and 48-lead LFCSP (7 mm × 7 mm)
APPLICATIONS
Process controls
High speed data acquisition
Digital signal processing
Spectrum analysis
ATE
GENERAL DESCRIPTION
The AD7631 is an 18-bit, charge redistribution, successive
approximation register (SAR), architecture analog-to-digital
converter (ADC) fabricated on Analog Devices, Inc.’s iCMOS
high voltage process. The device is configured through hardware
or via a dedicated write-only serial configuration port for input
range and operating mode. The AD7631 contains a high speed
18-bit sampling ADC, an internal conversion clock, an internal
reference (and buffer), error correction circuits, and both serial
and parallel system interface ports. A falling edge on CNVST
samples the fully differential analog inputs on IN+ and IN−.
The AD7631 features four different analog input ranges. Power is
scaled linearly with throughput. Operation is specified from
−40°C to +85°C.
FUNCTIONAL BLOCK DIAGRAM
18
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
CLOCK
AD7631
DGND
DVDD
AVDD
AGND
REF REFGND
IN+
PD
RESET
CNVST
PDBUF
REFBUFIN
PDREF
REF
TEMP
D[17:0]
BUSY
RD
CS
D0/OB/2C
OGND
OVDD
D2/A1
D1/A0
REF
AMP
SERIAL DATA
PORT
PARALLEL
INTERFACE
SWITCHED
CAP DAC
VCC VEE
BIPOLAR TEN
SERIAL
CONFIGURATION
PORT
IN–
MODE0
MODE1
Figure 1.
Table 1. 48-Lead PulSAR Selection
Input Type
Res
(Bits)
100 to
250
(kSPS)
500 to
570
(kSPS)
570 to
1000
(kSPS)
>1000
(kSPS)
Bipolar
14
AD7951
Differential
Bipolar
14
AD7952
Unipolar
16
AD7651
AD7650
AD7653
AD7660
AD7652
AD7667
AD7661
AD7664
AD7666
Bipolar
16
AD7610
AD7665
AD7612
AD7663
AD7671
Differential
16
AD7675
AD7676
AD7677
AD7621
Unipolar
AD7622
AD7623
Simultaneous/
16
AD7654
Multichannel
Unipolar
AD7655
Differential
18
AD7678
AD7679
AD7674
AD7641
Unipolar
AD7643
Differential
Bipolar
18
AD7631
AD7634


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