AD7634 Datasheet PDF - Analog Devices
| Part Number | AD7634 | |
| Description | (AD7631 / AD7634) 18-Bit 250/670 kSPS PulSAR Bipolar Programmable Inputs ADC | |
| Manufacturers | Analog Devices | |
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Preliminary Technical Data
18-Bit 250/670 kSPS PulSAR®
Bipolar Programmable Inputs ADC
AD7631/AD7634
FEATURES
Multiple pins/software programmable input ranges:
±10V, ±5V, 10V, 5V
iCMOS™ process technology
Pins or serial SPI input ranges/mode selection
Throughput:
670kSPS (AD7634)
250kSPS (AD7631)
INL: ± 1.75 LSB (7± ppm of full scale)
DNL: +2/-1 LSB
18-bit resolution with no missing codes
Dynamic range: 102.5 dB typical
SNR: 101 dB typical
THD: -122 dB typical
5V internal reference: typical drift 7ppm/°C; TEMP output
No pipeline delay (SAR architecture)
Parallel (18, 16- or 8-bit bus) and serial 5 V/3.3 V interface
SPI®-/QSPI™-/MICROWIRE™-/DSP-compatible
Power dissipation:
190 mW @ 670kSPS
75 mW @ 250kSPS
Pb-free 48-lead LQFP and LFCSP (7x7mm) packages
Pin compatible with other PulSAR ADCs
APPLICATIONS
Process control
High speed data acquisition
Digital signal processing
Spectrum analysis
Instrumentation
Communications
GENERAL DESCRIPTION
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.
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
FUNCTIONAL BLOCK DIAGRAM
TEMP REFBUFIN REF REFGND VCC VEE
DVDD DGND
AGND
AVDD
IN+
IN-
REF
REF AMP
SWITCHED
CAP DAC
PDREF
PDBUF
PD
RESET
CLOCK
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
AD7631/
AD7634
SERIAL
PROGRAMMABLE
PORT
SERIAL DATA
PORT
18
PARALLEL
INTERFACE
OVDD
OGND
SPPEN
SPPCLK
SPPDATA
HW/SW
D[17:0]
BUSY
RD
CS
D0/OB/2C
CNVST WARP IMPULSE
MODE0 MODE1
Figure 1.
Table 1. PulSAR® Selection
Type/kSPS
100 to
250
Pseudo
Differential
AD7651,
AD7660
AD7661
True Bipolar
True
Differential
AD7610,
AD7663
AD7675
500 to
570
AD7650
AD7652
AD7664
AD7666
AD7665
AD7676
18-Bit
Multichannel/
Simultaneous
AD7631
AD7678
AD7679
AD7654
AD7655
650 to
1000
AD7653
AD7667
>1000
AD7612,
AD7671
AD7677
AD7634
AD7674
AD7621
AD7622
AD7623
AD7641
AD7643
PRODUCT HIGHLIGHTS
1. Programmable input range and mode selection.
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.
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
©2006 Analog Devices, Inc. All rights reserved.
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Preliminary Technical Data
AD7631/AD7634
Parameter
Operating Current7
AVDD8
DVDD
OVDD
VCC
VEE
VCC
VEE
Power Dissipation
With Internal Reference7
With Internal Reference7
Without Internal Reference
Without Internal Reference7
In Power-Down Mode9
TEMPERATURE RANGE10
Specified Performance
Conditions
PDREF = PDBUF = low
AD7631 @ 250kSPS throughput
AD7634 @ 670kSPS throughput
AD7631 @ 250kSPS throughput
AD7634 @ 670kSPS throughput
AD7631 @ 250kSPS throughput
AD7634 @ 670kSPS throughput
AD7631 @ 250kSPS throughput
AD7631 @ 250kSPS throughput
AD7634 @ 670kSPS throughput
AD7634 @ 670kSPS throughput
AD7631 @ 250kSPS throughput
AD7634 @ 670kSPS throughput
AD7631 @ 250kSPS throughput
AD7634 @ 670kSPS throughput
PD = high
TMIN to TMAX
Min
−40
Typ Max
8.5
21
3.5
7
0.1
0.2
1
0.6
2.8
2
75
190
62
160
2
+85
1 The inputs are differential anti-phase. Refer to the Error! Reference source not found. section.
2 Linearity is tested using endnotes, not best fit.
3 LSB means least significant bit. With the 0 to 5V input range, 1 LSB 38.15μV.
4 All specifications in dB are referred to a full-scale input FSR. Tested with an input signal at 0.5 dB below full-scale, unless otherwise specified.
5 Parallel or serial 18-bit.
6 Conversion results are available immediately after completed conversion.
7 Tested in parallel reading mode.
8 With internal reference, PDREF and PDBUF are low; without internal reference, PDREF and PDBUF are high.
9 With all digital inputs forced to OVDD.
10Consult sales for extended temperature range.
Unit
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mW
mW
mW
μW
°C
Rev. PrC | Page 5 of 14
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Featured Datasheets
| Part Number | Description | MFRS |
| AD7631 | The function is (AD7631 / AD7634) 18-Bit 250/670 kSPS PulSAR Bipolar Programmable Inputs ADC. Analog Devices | |
| AD7634 | The function is (AD7631 / AD7634) 18-Bit 250/670 kSPS PulSAR Bipolar Programmable Inputs ADC. Analog Devices | |
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