- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄375238 > AD7711ASQ (ANALOG DEVICES INC) LC2MOS Signal Conditioning ADC with RTD Current Source PDF資料下載
參數(shù)資料
| 型號： | AD7711ASQ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | LC2MOS Signal Conditioning ADC with RTD Current Source |
| 中文描述： | 2-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, CDIP24 |
| 封裝： | 0.300 INCH, HERMETIC SEALED, CERDIP-24 |
| 文件頁數(shù)： | 1/27頁 |
| 文件大?。?/td> | 222K |
| 代理商： | AD7711ASQ |
當前第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁
a
AD7711A*
FUNCTIONAL BLOCK DIAGRAM
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
m
A
A = 1 – 128
DRDY
TFS
RFS
REF OUT
2.5V REFERENCE
AIN2(+)
AIN2(–)
V
SS
V
BIAS
AV
DD
DV
DD
PGA
AV
DD
RTD
CURRENT
400
m
A
AV
DD
FEATURES
Charge Balancing ADC
24 Bits No Missing Codes
6
0.0015% Nonlinearity
Two-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
LC
2
MOS Signal Conditioning ADC
with RTD Current Source
REV. C
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.
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 V
SS
pin to AGND)
provided that the input signals on the analog inputs are more
positive than –30 mV. By taking the V
SS
pin negative, the part
can convert signals down to –V
REF
on its inputs. The part also
provides a 400
μ
A 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 chan-
nel 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 using the bidirectional serial
port. The AD7711A contains self-calibration, system calibration
and background calibration options and also 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 op-
tions, 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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 1998
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD7711A* | LC2MOS Signal Conditioning ADC with RTD Current Source |
| AD7711AN | LC2MOS Signal Conditioning ADC with RTD Excitation Currents |
| AD7711AQ | LC2MOS Signal Conditioning ADC with RTD Excitation Currents |
| AD7711AR | LC2MOS Signal Conditioning ADC with RTD Excitation Currents |
| AD7711SQ | LC2MOS Signal Conditioning ADC with RTD Excitation Currents |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD7711SQ | 制造商:Analog Devices 功能描述:- Rail/Tube |
| AD7712 | 制造商:AD 制造商全稱:Analog Devices 功能描述:LC2MOS Signal Conditioning ADC |
| AD7712_04 | 制造商:AD 制造商全稱:Analog Devices 功能描述:LC2MOS Signal Conditioning ADC |
| AD7712AN | 功能描述:IC ADC SIGNAL COND LC2MOS 24-DIP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)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(zhuǎn)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(yīng)商設(shè)備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類型:1 個單端，雙極 |
發(fā)布緊急采購，3分鐘左右您將得到回復。