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參數資料
| 型號： | AD7701ARS |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | LC2MOS 16-Bit A/D Converter |
| 中文描述： | 1-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO28 |
| 封裝： | MO-150AH, SSOP-28 |
| 文件頁數： | 1/16頁 |
| 文件大小： | 312K |
| 代理商： | AD7701ARS |
REV. D
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
a
AD7701
LC
2
MOS
16-Bit A/DConverter
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
6
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
GE NE RAL DE SCRIPT ION
T he AD7701 is a 16-bit ADC which uses a sigma-delta conver-
sion technique. T he analog input is continuously sampled by an
analog modulator whose mean output duty cycle is proportional
to the input signal. T he 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. T he sampling rate, filter corner fre-
quency 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.
T he 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. T he self-calibration scheme
can also be extended to null system offset and gain errors in the
input channel.
T he output data is accessed through a flexible serial port, which
has an asynchronous mode compatible with UART s and two
synchronous modes suitable for interfacing to shift registers or
the serial ports of industry-standard microcontrollers.
CMOS construction insures low power dissipation, and a power
down mode reduces the idle power consumption to only 10
μ
W.
PRODUCT HIGHLIGHT S
1. T he 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. T he 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
AD7701 to interface directly to UART s or to the serial ports
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.
Analog Devices, Inc., 1996
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
FUNCT IONAL BLOCK DIAGRAM
5
DGND
AV
DD
DV
DD
AV
SS
DV
SS
SC1
SC2
14
15
7
6
4
17
AGND
A
IN
V
REF
9
10
8
13
CASRAM
CALIBRATION
MICROCONTROLLER
16-BIT A/D CONVERTER
ANALOG
MODULATOR
CAL
BP/UP
SLEEP
12
11
20
19
CLOCK
GENERATOR
SERIALOGIC
SDATA
SCLK
3
2
1
16
18
CLKIN
CLKOUT
MODE
CS
DRDY
6-POLE GAUSSIAN
LOW-PASS
DIGITAL FILTER
AD7701
相關PDF資料 |
PDF描述 |
|---|---|
| AD7701BN | LC2MOS 16-Bit A/D Converter |
| AD7701BQ | LC2MOS 16-Bit A/D Converter |
| AD7701BR | LC2MOS 16-Bit A/D Converter |
| AD7701SQ | LC2MOS 16-Bit A/D Converter |
| AD7701TQ | LC2MOS 16-Bit A/D Converter |
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