18-Bit 250/670 kSPS PulSAR®
Bipolar Programmable Inputs ADC
Preliminary Technical Data
AD7631/AD7634
FEATURES
FUNCTIONAL BLOCK DIAGRAM
TEMP REFBUFIN REF REFGND
VEE
DVDD DGND
VCC
Multiple pins/software programmable input ranges:
±10ꢀ, ±±ꢀ, 10ꢀ, ±ꢀ
iCMOS™ process technology
OVDD
AD7631/
AD7634
AGND
AVDD
OGND
SPPEN
SPPCLK
SPPDATA
HW/SW
Pins or serial SPI input ranges/mode selection
Throughput:
670kSPS (AD7634)
2±0kSPS (AD7631)
INL: ± 1.7± LSB (7± ppm of full scale)
DNL: +2/-1 LSB
18-bit resolution with no missing codes
Dynamic range: 102.± dB typical
SNR: 101 dB typical
REF
SERIAL
PROGRAMMABLE
PORT
REF AMP
IN+
IN-
SWITCHED
CAP DAC
SERIAL DATA
PORT
18
D[17:0]
BUSY
RD
PDREF
PDBUF
PD
CLOCK
PARALLEL
INTERFACE
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
CS
RESET
D0/OB/2C
THD: -122 dB typical
CNVST WARP IMPULSE
MODE1
MODE0
±ꢀ internal reference: typical drift 7ppm/°C; TEMP output
No pipeline delay (SAR architecture)
Parallel (18, 16- or 8-bit bus) and serial ± ꢀ/3.3 ꢀ interface
SPI®-/QSPI™-/MICROWIRE™-/DSP-compatible
Power dissipation:
Figure 1.
Table 1. PulSAR® Selection
100 to
±00 to
±70
6±0 to
1000
Type/kSPS
2±0
>1000
190 mW @ 670kSPS
7± mW @ 2±0kSPS
Pb-free 48-lead LQFP and LFCSP (7x7mm) packages
Pin compatible with other PulSAR ADCs
Pseudo
Differential
AD7651,
AD7660
AD7661
AD7650
AD7652
AD7664
AD7666
AD7653
AD7667
True Bipolar
AD7610,
AD7663
AD7675
AD7665
AD7612,
AD7671
AD7677
APPLICATIONS
True
AD7676
AD7621
AD7622
AD7623
AD7641
AD7643
Differential
Process control
High speed data acquisition
Digital signal processing
Spectrum analysis
Instrumentation
Communications
18-Bit
Multichannel/
Simultaneous
AD7631
AD7678
AD7679
AD7634
AD7674
AD7654
AD7655
PRODUCT HIGHLIGHTS
GENERAL DESCRIPTION
1. Programmable input range and mode selection.
The AD7631/AD7634 is an18-bit, charge redistribution
successive approximation register (SAR) architecture analog-to-
digital converter (ADC) with programmable input ranges and
mode selection via a dedicated write only serial interface (or by
hardware pin-strapping). The device is fabricated on ADI’s
patented iCMOS high voltage process. The device contains a
high speed 18-bit sampling ADC, an internal conversion clock,
an internal reference (and buffer), and both serial and parallel
system interface ports. Power consumption is automatically
scaled with throughput (AD7634 in Impulse mode), making it
ideal for battery-powered applications. It is available in Pb-free,
48-lead packages with operation specified from −40°C to
+85°C.
Dedicated write only serial port used for selecting input
range and mode select (mode select AD7634 only).
2. Fast throughput
The AD7634 is 670kSPS and the AD7631 is 250kSPS.
3. Superior Linearity.
No missing 18-bit code. +/- 1.75 LSB typical INL
4. Internal Reference.
5 V internal reference with a typical drift of 7 ppm/°C
and on-chip TEMP sensor.
5. Serial or Parallel Interface.
Versatile parallel (18, 16- or 8-bit bus) or 2-wire serial
interface arrangement compatible with 3.3 V, or 5 V logic.
Rev. PrC
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.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2006 Analog Devices, Inc. All rights reserved.
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