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參數(shù)資料
| 型號(hào)： | AD7641BCPZRL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | 18-Bit 250/670 kSPS PulSAR Bipolar Programmable Inputs ADC |
| 中文描述： | 1-CH 18-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, QCC48 |
| 封裝： | 7 X 7 MM, LEAD FREE, MO-220VKKD-2, LFCSP-48 |
| 文件頁數(shù)： | 1/14頁 |
| 文件大?。?/td> | 192K |
| 代理商： | AD7641BCPZRL |
18-Bit 250/670 kSPS PulSAR
Bipolar Programmable Inputs ADC
Preliminary Technical Data
AD7631/AD7634
FEATURES
Multiple pins/software programmable input ranges:
±10V, ±5V, 10V, 5V
i
CMOS 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:
1
90
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
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 registered trademarks are the 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
2006 Analog Devices, Inc. All rights reserved.
www.analog.com
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
i
CMOS 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.
FUNCTIONAL BLOCK DIAGRAM
-
18
CONTROL LOGIC AND
CALIBRATION CIRCUITRY
CLOCK
AD7631/
AD7634
DGND
DVDD
AVDD
AGND
REF REFGND
IN+
IN-
PD
RESET
CNVST
PDBUF
REFBUFIN
PDREF
REF
TEMP
D[17:0]
BUSY
RD
CS
D0/OB/2C
OGND
OVDD
REF AMP
SERIAL DATA
PORT
PARALLEL
INTERFACE
SWITCHED
CAP DAC
VCC VEE
WARP IMPULSE
SERIAL
PROGRAMMABLE
PORT
SPPDATA
SPPCLK
SPPEN
HW/SW
MODE0
MODE1
Figure 1.
Table 1. PulSAR Selection
Type/kSPS
Pseudo
Differential
100 to
250
AD7651
,
AD7660
AD7661
500 to
570
AD7650
AD7652
AD7664
AD7666
AD7665
650 to
1000
AD7653
AD7667
>1000
True Bipolar
AD7610
,
AD7663
AD7675
AD7612
,
AD7671
AD7677
True
Differential
AD7676
AD7621
AD7622
AD7623
AD7641
AD7643
18-Bit
Multichannel/
Simultaneous
AD7631
AD7678
AD7679
AD7634
AD7674
AD7654
AD7655
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.
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