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| 型號： | AD7731BRU |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | Low Noise, High Throughput 24-Bit Sigma-Delta ADC |
| 中文描述： | 6-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO24 |
| 封裝： | MO-153AD, TSSOP-24 |
| 文件頁數(shù)： | 1/44頁 |
| 文件大小： | 411K |
| 代理商： | AD7731BRU |
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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
AD7731
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
World Wide Web Site: http://www.analog.com
Fax: 617/326-8703
Analog Devices, Inc., 1997
LowNoise, Hgh Throughput
24-Bit Sigma-Delta ADC
FUNCT IONAL BLOCK DIAGRAM
SIGMA-
DELTA
MODULATOR
AD7731
SERIAL INTERFACE
AND CONTROL LOGIC
CLOCK
GENERATION
PROGRAMMABLE
DIGITAL
FILTER
SIGMA-DELTA A/D CONVERTER
BUFFER
PGA
100nA
AGND
100nA
AV
DD
NC
AIN1
AIN2
AIN3
AIN4
STANDBY
SYNC
MCLK IN
MCLK OUT
SCLK
CS
DIN
DOUT
RESET
RDY
POL
DGND
AGND
AV
DD
DV
DD
REF IN(–)
REF IN(+)
MUX
AIN5
AIN6
REGISTER BANK
CALIBRATION
MICROCONTROLLER
GE NE RAL DE SCRIPT ION
T he AD7731 is a complete analog front-end for process control
applications. T he device has a proprietary programmable gain
front end that allows it to accept a range of input signal ranges,
including low level signals, directly from a transducer. T he sigma-
delta architecture of the part consists of an analog modulator
and a low pass programmable digital filter, allowing adjustment
of filter cutoff, output rate and settling time.
T he part features three buffered differential programmable gain
analog inputs (which can be configured as five pseudo-differential
inputs), as well as a differential reference input. T he part oper-
ates from a single +5 V supply and accepts seven unipolar ana-
log input ranges: 0 to +20 mV, +40 mV, +80 mV, +160 mV,
+320 mV, +640 mV and +1.28 V, and seven bipolar ranges:
±
20 mV,
±
40 mV,
±
80 mV,
±
160 mV,
±
320 mV,
±
640 mV and
±
1.28 V. T he peak-to-peak resolution achievable directly from
the part is 16 bits at an 800 Hz output rate. T he part can switch
between channels with 1 ms settling time and maintain a perfor-
mance level of 13 bits of peak-to-peak resolution.
T he serial interface on the part can be configured for three-wire
operation and is compatible with microcontrollers and digital
signal processors. T he AD7731 contains self-calibration and
system calibration options and features an offset drift of less
than 5 nV/
°
C and a gain drift of less than 2 ppm/
°
C.
T he part is available in a 24-lead plastic DIP, a 24-lead SOIC
and 24-lead T SSOP package.
FEATURES
24-Bit Sigma-Delta ADC
16 Bits p-p Resolution at 800 Hz Output Rate
Programmable Output Rates up to 6.4 kHz
Programmable Gain Front End
6
0.0015% Nonlinearity
Buffered Differential Inputs
Programmable Filter Cutoffs
FASTStep * Mode for Channel Sequencing
Single Supply Operation
APPLICATIONS
Process Control
PLCs/DCS
Industrial Instrumentation
*
FAST
Step is a trademark of Analog Devices, Inc.
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