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AD7701ARS-REEL 参数 Datasheet PDF下载

AD7701ARS-REEL图片预览
型号: AD7701ARS-REEL
PDF下载: 下载PDF文件 查看货源
内容描述: [1-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO28, SSOP-28]
分类和应用: 光电二极管转换器
文件页数/大小: 21 页 / 346 K
品牌: AD [ ANALOG DEVICES ]
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LC MOS
16-Bit A/D Converter
FEATURES
Monolithic 16-Bit ADC
0.0015% Linearity Error
On-Chip Self-Calibration Circuitry
Programmable Low-Pass Filter
0.1 Hz to 10 Hz Corner Frequency
0 V to +2.5 V or 2.5 V Analog Input Range
4 kSPS Output Data Rate
Flexible Serial Interface
Ultralow Power
APPLICATIONS
Industrial Process Control
Weigh Scales
Portable Instrumentation
Remote Data Acquisition
FUNCTIONAL BLOCK DIAGRAM
AV
DD
14
DV
DD
AV
SS
DV
SS
15
7
6
SC1
4
SC2
17
2
CALIBRATION
SRAM
CALIBRATION
MICROCONTROLLER
13 CAL
A
IN
9
16-BIT A/D CONVERTER
12 BP/UP
ANALOG
MODULATOR
6-POLE GAUSSIAN
LOW-PASS
DIGITAL FILTER
V
REF
10
11
SLEEP
AGND
8
CLOCK
GENERATOR
SERIAL INTERFACE
LOGIC
20 SDATA
19 SCLK
DGND
5
3
CLKIN
2
CLKOUT
1
MODE
16
CS
18
DRDY
GENERAL DESCRIPTION
PRODUCT HIGHLIGHTS
The AD7701 is a 16-bit ADC that uses a sigma-delta conversion
technique. The analog input is continuously sampled by an analog
modulator whose mean output duty cycle is proportional to the
input signal. The modulator output is processed by an on-chip
digital filter with a six-pole Gaussian response, which updates
the output data register with 16-bit binary words at word rates up
to 4 kHz. The sampling rate, filter corner frequency, and output
word rate are set by a master clock input that may be supplied
externally, or by a crystal controlled on-chip clock oscillator.
The inherent linearity of the ADC is excellent and endpoint
accuracy is ensured by self-calibration of zero and full scale,
which may be initiated at any time. The self-calibration scheme
can also be extended to null system offset and gain errors in the
input channel.
The output data is accessed through a flexible serial port, which
has an asynchronous mode compatible with UARTs and two
synchronous modes suitable for interfacing to shift registers or
the serial ports of industry-standard microcontrollers.
CMOS construction ensures low power dissipation, and a power-
down mode reduces the idle power consumption to only 10
µW.
1. The AD7701 offers 16-bit resolution coupled with outstand-
ing 0.0015% accuracy.
2. No missing codes ensures true, usable, 16-bit dynamic range,
removing the need for programmable gain and level-setting
circuitry.
3. The effects of temperature drift are eliminated by on-chip
self-calibration, which removes zero and gain error. External
circuits can also be included in the calibration loop to remove
system offsets and gain errors.
4. A flexible synchronous/asynchronous interface allows the
of industry-standard microcontrollers.
5. Low operating power consumption and an ultralow power
standby mode make the AD7701 ideal for loop-powered
remote sensing applications, or battery-powered portable
instruments.
REV. E
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. 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 companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
© 2003 Analog Devices, Inc. All rights reserved.