參數(shù)資料
型號(hào)： AD7712AN
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 1/28頁(yè)
文件大?。?/td> 0K
描述： IC ADC SIGNAL COND LC2MOS 24-DIP
標(biāo)準(zhǔn)包裝： 15
位數(shù)： 24
采樣率（每秒）： 1.03k
數(shù)據(jù)接口： 串行
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 45mW
電壓電源： 模擬和數(shù)字，雙 ±
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 通孔
封裝/外殼： 24-DIP（0.300"，7.62mm）
供應(yīng)商設(shè)備封裝： 24-PDIP
包裝： 管件
輸入數(shù)目和類(lèi)型： 1 個(gè)單端，單極；1 個(gè)差分，單極；1 個(gè)差分，雙極
REV. F
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 owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
2004 Analog Devices, Inc. All rights reserved.
AD7712
LC2MOS
Signal Conditioning ADC
FUNCTIONAL BLOCK DIAGRAM
CLOCK
GENERATION
SERIAL INTERFACE
OUTPUT
REGISTER
CHARGE-BALANCING A/D
CONVERTER
AUTO-ZEROED
–
MODULATOR
DIGITAL
FILTER
AD7712
AGND DGND
MODE SDATA SCLK
A0
MCLK
OUT
MCLK
IN
AIN1(–)
REF
IN (–)
REF
IN (+)
SYNC
4.5 A
A = 1 – 128
DRDY
TFS
RFS
REF OUT
VBIAS
VOLTAGE
ATTENUATION
AIN2
TP
STANDBY
CONTROL
REGISTER
VSS
2.5V REFERENCE
DVDD
AVDD
M
U
X
AIN1(+)
PGA
FEATURES
Charge Balancing ADC
24 Bits No Missing Codes
0.0015% Nonlinearity
High Level and Low Level Analog Input Channels
Programmable Gain for Both Inputs
Gains from 1 to 128
Differential Input for Low Level Channel
Low-Pass Filter with Programmable Filter Cutoffs
Ability to Read/Write Calibration Coefficients
Bidirectional Microcontroller Serial Interface
Internal/External Reference Option
Single- or Dual-Supply Operation
Low Power (25 mW typ) with Power-Down Mode
(100
W typ)
APPLICATIONS
Process Control
Smart Transmitters
Portable Industrial Instruments
GENERAL DESCRIPTION
The AD7712 is a complete analog front end for low frequency
measurement applications. The device has two analog input
channels and accepts either low level signals directly from a trans-
ducer or high level (
±4 V
REF) signals, and outputs a serial
digital word. It employs a sigma-delta conversion technique to
realize up to 24 bits of no missing codes performance. The low
level input signal is applied to a proprietary programmable gain
front end based around an analog modulator. The high level
analog input is attenuated before being applied to the same
modulator. The modulator output is processed by an on-chip
digital filter. The first notch of this digital filter can be programmed
via the on-chip control register, allowing adjustment of the filter
cutoff and settling time.
Normally, one of the channels will be used as the main channel
with the second channel used as an auxiliary input to periodi-
cally measure a second voltage. The part can be operated from a
single supply (by tying the VSS pin to AGND), provided that the
input signals on the low level analog input are more positive
than –30 mV. By taking the VSS pin negative, the part can con-
vert signals down to –VREF on this low level input. This low level
input, as well as the reference input, features differential input
capability.
The AD7712 is ideal for use in smart, microcontroller based
systems. Input channel selection, gain settings, and signal polar-
ity can be configured in software using the bidirectional serial
port. The AD7712 also contains self-calibration, system calibra-
tion, and background calibration options, and allows the user to
read and to write the on-chip calibration registers.
CMOS construction ensures low power dissipation, and a hard-
ware programmable power-down mode reduces the standby power
consumption to only 100
W typical. The part is available in a
24-lead, 0.3 inch wide, plastic and hermetic dual-in-line pack-
age (DIP), as well as a 24-lead small outline (SOIC) package.
PRODUCT HIGHLIGHTS
1. The low level analog input channel allows the AD7712 to
accept input signals directly from a strain gage or transducer,
removing a considerable amount of signal conditioning. To
maximize the flexibility of the part, the high level analog
input accepts signals of
±4
VREF/GAIN.
2. The AD7712 is ideal for microcontroller or DSP processor
applications with an on-chip control register that allows
control over filter cutoff, input gain, channel selection, signal
polarity, and calibration modes.
3. The AD7712 allows the user to read and to write the on-chip
calibration registers. This means that the microcontroller has
much greater control over the calibration procedure.
4. No missing codes ensures true, usable, 23-bit dynamic range
coupled with excellent
±0.0015% accuracy. The effects of
temperature drift are eliminated by on-chip self-calibration,
which removes zero-scale and full-scale errors.
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參數(shù)描述
AD7712ANZ 功能描述:IC ADC SIGNAL COND LC2MOS 24-DIP RoHS:是 類(lèi)別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 其它有關(guān)文件:TSA1204 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:- 位數(shù):12 采樣率（每秒）:20M 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:155mW 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:48-TQFP 供應(yīng)商設(shè)備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數(shù)目和類(lèi)型:4 個(gè)單端，單極；2 個(gè)差分，單極 產(chǎn)品目錄頁(yè)面:1156 (CN2011-ZH PDF) 其它名稱(chēng):497-5435-6
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