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| 型號： | AD7711AAR |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 1/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 24BIT RTD I SOURCE 24SOIC |
| 標準包裝： | 1 |
| 位數(shù)： | 24 |
| 采樣率（每秒）： | 1.03k |
| 數(shù)據(jù)接口： | 串行 |
| 轉換器數(shù)目： | 1 |
| 功率耗散（最大）： | 52.5mW |
| 電壓電源： | 模擬和數(shù)字，雙 ± |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-SOIC（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 24-SOIC W |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 2 個差分，單極；2 個差分，雙極 |
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AD7711A*
FUNCTIONAL BLOCK DIAGRAM
FEATURES
Charge Balancing ADC
24 Bits No Missing Codes
0.0015% Nonlinearity
2-Channel Programmable Gain Front End
Gains from 1 to 128
Differential Inputs
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
(7 mW typ)
APPLICATIONS
RTD Transducers
LC2MOS Signal Conditioning ADC
with RTD Current Source
GENERAL DESCRIPTION
The AD7711A 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 sigma-delta 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 analog modulator. The modulator output is pro-
cessed by an on-chip digital filter. The first notch of this digital
filter can be programmed via the on-chip control register, allow-
ing adjustment of the filter cutoff and settling time.
The part features two differential analog inputs and a differen-
tial reference input. Normally, one of the channels will be used
as the main channel with the second channel used as an auxil-
iary 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 also
provides a 400
mA current source that can be used to provide
excitation for RTD transducers. The AD7711A thus performs
all signal conditioning and conversion for a single- or dual-
channel system.
The AD7711A is ideal for use in smart, microcontroller based
systems. Input channel selection, gain settings, and signal polar-
ity can be configured in software by using the bidirectional serial
port. The AD7711A contains self-calibration, system calibra-
tion, and background calibration options and allows the user to
read and write the on-chip calibration registers.
*Protected by U.S. Patent No. 5,134,401.
CMOS construction ensures low power dissipation, and a soft-
ware 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, hermetic dual-in-line package
(CERDIP), as well as a 24-lead small outline (SOIC) package.
PRODUCT HIGHLIGHTS
1. The programmable gain front end allows the AD7711A
to accept input signals directly from an RTD transducer,
removing a considerable amount of signal conditioning. An
on-chip current source provides the excitation current for
the RTD.
2. The part features excellent static performance specifications
with 24-bit no missing codes,
±0.0015% accuracy, and low
rms noise (<250 nV). Endpoint errors and the effects of
temperature drift are eliminated by on-chip calibration
options, which remove zero-scale and full-scale errors.
3. The AD7711A 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 AD7711A allows the user to read and to write the
on-chip calibration registers. This means that the micro-
controller has much greater control over the calibration
procedure.
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 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.
CLOCK
GENERATION
SERIAL INTERFACE
CONTROL
REGISTER
OUTPUT
REGISTER
CHARGE-BALANCING A/D
CONVERTER
AUTO-ZEROED
-
MODULATOR
DIGITAL
FILTER
AD7711A
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
AIN2(+)
AIN2(–)
VSS
VBIAS
AVDD
DVDD
PGA
AVDD
RTD
CURRENT
400 A
AVDD
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相關代理商/技術參數(shù) |
參數(shù)描述 |
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| AD7711AARZ | 功能描述:IC ADC 24BIT RTD I SOURCE 24SOIC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 其它有關文件:TSA1204 View All Specifications 標準包裝: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 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應商設備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數(shù)目和類型:4 個單端，單極；2 個差分，單極 產(chǎn)品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6 |
| AD7711AN | 功能描述:IC ADC 24BIT RTD I SOURCE 24-DIP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 位數(shù):12 采樣率（每秒）:3M 數(shù)據(jù)接口:- 轉換器數(shù)目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數(shù)目和類型:- |
| AD7711ANZ | 功能描述:IC ADC 24BIT RTD I SOURCE 24-DIP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 其它有關文件:TSA1204 View All Specifications 標準包裝: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 安裝類型:表面貼裝 封裝/外殼:48-TQFP 供應商設備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數(shù)目和類型:4 個單端，單極；2 個差分，單極 產(chǎn)品目錄頁面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6 |
| AD7711ANZ | 制造商:Analog Devices 功能描述:IC ADC 24-BIT SIGMA DELTA |
| AD7711AQ | 功能描述:IC ADC 24BIT RTD I SOURCE 24CDIP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉換器 系列:- 標準包裝:1 系列:- 位數(shù):14 采樣率（每秒）:83k 數(shù)據(jù)接口:串行，并聯(lián) 轉換器數(shù)目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應商設備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類型:1 個單端，雙極 |
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