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| 型号： | AD7711AQ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 1/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 24BIT RTD I SOURCE 24CDIP |
| 标准包装： | 15 |
| 位数： | 24 |
| 采样率（每秒）： | 1.03k |
| 数据接口： | 串行 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 52.5mW |
| 电压电源： | 模拟和数字，双 ± |
| 工作温度： | -40°C ~ 80°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 24-CDIP（0.300"，7.62mm） |
| 供应商设备封装： | 24-CDIP |
| 包装： | 管件 |
| 输入数目和类型： | 1 个单端，单极；1 个单端，双极；1 个差分，单极；1 个差分，双极 |
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FUNCTIONAL BLOCK DIAGRAM
CLOCK
GENERATION
SERIAL INTERFACE
CONTROL
REGISTER
OUTPUT
REGISTER
CHARGE-BALANCING A/D
CONVERTER
AUTO-ZEROED
-
MODULATOR
DIGITAL
FILTER
AD7711
M
U
X
AGND DGND
MODE SDATA SCLK
A0
MCLK
OUT
MCLK
IN
AIN1(+)
AIN1(–)
REF
IN (–)
REF
IN (+)
SYNC
4.5 A
A = 1–128
DRDY
TFS
RFS
REF OUT
2.5V REFERENCE
200 A
AIN2
VSS
VBIAS
AVDD
DVDD
PGA
AVDD
RTD2
200 A
RTD1
AVDD
FEATURES
Charge-Balancing ADC
24 Bits, No Missing Codes
0.0015% Nonlinearity
2-Channel Programmable Gain Front End
Gains from 1 to 128
1 Differential Input
1 Single-Ended Input
Low-Pass Filter with Programmable Filter Cutoffs
Ability to Read/Write Calibration Coefficients
RTD Excitation Current Sources
Bidirectional Microcontroller Serial Interface
Internal/External Reference Option
Single- or Dual-Supply Operation
Low Power (25 mW typ) with Power-Down Mode
(7 mW typ)
APPLICATIONS
RTD Transducers
Process Control
Smart Transmitters
Portable Industrial Instruments
LC2MOS Signal Conditioning ADC
with RTD Excitation Currents
GENERAL DESCRIPTION
The AD7711 is a complete analog front end for low frequency
measurement applications. The device accepts low level signals
directly from a transducer and outputs a serial digital word. It
employs a -
conversion technique to realize up to 24 bits of
no missing codes performance. The input signal is applied to a
proprietary programmable gain front end based around an ana-
log modulator. The modulator output is processed by an on-chip
digital filter. The first notch of this digital filter can be pro-
grammed via the on-chip control register, allowing adjustment
of the filter cutoff and settling time.
The part features one differential analog input and one single-
ended analog input as well as a differential reference input.
Normally, one of the input channels will be used as the main
channel with the second channel used as an auxiliary input to
periodically measure a second voltage. It can be operated from a
single supply (by tying the VSS pin to AGND), provided that the
input signals on the analog inputs are more positive than –30 mV.
By taking the VSS pin negative, the part can convert signals
down to –VREF on its inputs. The part provides two current
sources that can be used to provide excitation in 3-wire and 4-wire
RTD configurations. The AD7711 thus performs all signal
conditioning and conversion for a single- or dual-channel system.
AD7711
The AD7711 is ideal for use in smart, microcontroller based
systems. Gain settings, signal polarity, input channel selection,
and RTD current control can be configured in software using
the bidirectional serial port. The AD7711 contains self-
calibration, system calibration, and background calibration
options, and also allows the user to read and write the on-chip
calibration registers.
CMOS construction ensures low power dissipation, and a software
programmable power-down mode reduces the standby power
consumption to only 7 mW 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 programmable gain front end allows the AD7711 to
accept input signals directly from an RTD transducer,
removing a considerable amount of signal conditioning.
On-chip current sources provide excitation for 3-wire and
4-wire RTD configurations.
2. No missing codes ensure 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.
3. The AD7711 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, RTD current control, and calibration modes.
4. The AD7711 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.
REV. G
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.
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| AD7711AR | 功能描述:IC ADC 24BIT RTD I SOURCE 24SOIC RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:- 位数:14 采样率（每秒）:83k 数据接口:串行，并联 转换器数目:1 功率耗散（最大）:95mW 电压电源:双 ± 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:28-DIP（0.600"，15.24mm） 供应商设备封装:28-PDIP 包装:管件 输入数目和类型:1 个单端，双极 |
| AD7711AR-REEL | 功能描述:IC ADC 24BIT RTD I SOURCE 24SOIC RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:- 位数:14 采样率（每秒）:83k 数据接口:串行，并联 转换器数目:1 功率耗散（最大）:95mW 电压电源:双 ± 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:28-DIP（0.600"，15.24mm） 供应商设备封装:28-PDIP 包装:管件 输入数目和类型:1 个单端，双极 |
| AD7711AR-REEL7 | 功能描述:IC ADC 24BIT RTD I SOURCE 24SOIC RoHS:否 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:- 位数:14 采样率（每秒）:83k 数据接口:串行，并联 转换器数目:1 功率耗散（最大）:95mW 电压电源:双 ± 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:28-DIP（0.600"，15.24mm） 供应商设备封装:28-PDIP 包装:管件 输入数目和类型:1 个单端，双极 |
| AD7711ARZ | 功能描述:IC ADC 24BIT RTD I SOURCE 24SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:microPOWER™ 位数:8 采样率（每秒）:1M 数据接口:串行，SPI? 转换器数目:1 功率耗散（最大）:- 电压电源:模拟和数字 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-VQFN 裸露焊盘（4x4） 包装:Digi-Reel® 输入数目和类型:8 个单端，单极 产品目录页面:892 (CN2011-ZH PDF) 其它名称:296-25851-6 |
| AD7711ARZ | 制造商:Analog Devices 功能描述:LC 2MOS SIGNAL CONDITIONING ANALOG/DIGIT |
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