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| 型号： | EVAL-AD7731EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 1/44页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR AD7731 |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 24 |
| 采样率（每秒）： | 6.4k |
| 数据接口： | 串行 |
| 输入范围： | ±1.28 V |
| 在以下条件下的电源（标准）： | 67.5mW @ 6.4kSPS |
| 工作温度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7731 |
| 已供物品： | 板，CD |
| 相关产品： | AD7731BNZ-ND - IC ADC 24BIT SIGMA-DELTA 24DIP AD7731BRUZ-REEL7-ND - IC ADC 24BIT SIGMA-DELTA 24TSSOP AD7731BRUZ-REEL-ND - IC ADC 24BIT SIGMA-DELTA 24TSSOP AD7731BRUZ-ND - IC ADC 24BIT SIGMA-DELTA 24TSSOP AD7731BRZ-REEL7-ND - IC ADC 24BIT SIGMA-DELTA 24-SOIC AD7731BRZ-REEL-ND - IC ADC 24BIT SIGMA-DELTA 24-SOIC AD7731BRZ-ND - IC ADC 24BIT SIGMA-DELTA 24-SOIC AD7731BRU-REEL7-ND - IC ADC 24BIT SIGMA-DELTA 24TSSOP AD7731BRU-ND - IC ADC 24BIT SIGMA-DELTA 24TSSOP AD7731BR-REEL7-ND - IC ADC 24BIT SIGMA-DELTA 24-SOIC 更多... |
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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
Low Noise, High Throughput
24-Bit Sigma-Delta ADC
FUNCTIONAL 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
AVDD
NC
AIN1
AIN2
AIN3
AIN4
STANDBY
SYNC
MCLK IN
MCLK OUT
SCLK
CS
DIN
DOUT
RESET
RDY
POL
DGND
AGND
AVDD
DVDD
REF IN(–)
REF IN(+)
MUX
AIN5
AIN6
REGISTER BANK
CALIBRATION
MICROCONTROLLER
GENERAL DESCRIPTION
The AD7731 is a complete analog front-end for process control
applications. The 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. The 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.
The 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. The 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. The peak-to-peak resolution achievable directly from
the part is 16 bits at an 800 Hz output rate. The part can switch
between channels with 1 ms settling time and maintain a perfor-
mance level of 13 bits of peak-to-peak resolution.
The serial interface on the part can be configured for three-wire
operation and is compatible with microcontrollers and digital
signal processors. The 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.
The part is available in a 24-lead plastic DIP, a 24-lead SOIC
and 24-lead TSSOP 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
0.0015% Nonlinearity
Buffered Differential Inputs
Programmable Filter Cutoffs
FASTStep* Mode for Channel Sequencing
Single Supply Operation
APPLICATIONS
Process Control
PLCs/DCS
Industrial Instrumentation
*FASTStep is a trademark of Analog Devices, Inc.
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