參數(shù)資料
型號(hào)： AD7711A*
廠商： Analog Devices, Inc.
英文描述： LC2MOS Signal Conditioning ADC with RTD Current Source
中文描述： LC2MOS信號(hào)調(diào)理ADC的電流源電阻
文件頁(yè)數(shù)： 7/27頁(yè)
文件大小： 222K
2
AD7711A
–7–
REV. C
PIN FUNCTION DESCRIPTIONS
Pin
Mnemonic
Function
1
SCLK
Serial Clock. Logic Input/Output depending on the status of the MODE pin. When MODE is high, the
device is in its self-clocking mode and the SCLK pin provides a serial clock output. This SCLK becomes
active when
RFS
or
TFS
goes low and it goes high impedance when either
RFS
or
TFS
returns high or when
the device has completed transmission of an output word. When MODE is low, the device is in its external
clocking mode and the SCLK pin acts as an input. This input serial clock can be a continuous clock with all
data transmitted in a continuous train of pulses. Alternatively, it can be a noncontinuous clock with the
information being transmitted to the AD7711A in smaller batches of data.
Master Clock signal for the device. This can be provided in the form of a crystal or external clock. A crystal can
be tied across the MCLK IN and MCLK OUT pins. Alternatively, the MCLK IN pin can be driven with a
CMOS compatible clock and MCLK OUT left unconnected. The clock input frequency is nominally 10 MHz.
When the master clock for the device is a crystal, the crystal is connected between MCLK IN and MCLK OUT.
Address Input. With this input low, reading and writing to the device is to the control register. With this input
high, access is to either the data register or the calibration registers.
Logic Input which allows for synchronization of the digital filters when using a number of AD7711As. It resets
the nodes of the digital filter.
Logic Input. When this pin is high, the device is in its self-clocking mode; with this pin low, the device is in its
external clocking mode.
Analog Input Channel 1. Positive input of the programmable gain differential analog input. The AIN1(+) input
is connected to an output current source which can be used to check that an external transducer has burned out
or gone open circuit. This output current source can be turned on/off via the control register.
Analog Input Channel 1. Negative input of the programmable gain differential analog input.
Analog Input Channel 2. Positive input of the programmable gain differential analog input.
Analog Input Channel 2. Negative input of the programmable gain differential analog input.
Analog Negative Supply, 0 V to –5 V. Tied to AGND for single supply operation. The input voltage on AIN1
or AIN2 should not go > 30 mV negative w.r.t. V
SS
for correct operation of the device.
Analog Positive Supply Voltage, +5 V to +10 V.
Input Bias Voltage. This input voltage should be set such that V
BIAS
+ 0.85
×
V
REF
< AV
DD
and V
BIAS
– 0.85
×
V
REF
>V
SS
where V
REF
is REF IN(+) – REF IN(–). Ideally, this should be tied halfway between AV
DD
and V
SS
. Thus with AV
DD
= +5 V and V
SS
= 0 V, it can be tied to REF OUT; with AV
DD
= +5 V and V
SS
=
–5 V, it can be tied to AGND while with AV
DD
= +10 V, it can be tied to +5 V.
Reference Input. The REF IN(–) can lie anywhere between AV
DD
and V
SS
provided REF IN(+) is greater
than REF IN(–).
Reference Input. The reference input is differential providing that REF IN(+) is greater than REF IN(–).
REF IN(+) can lie anywhere between AV
DD
and V
SS
.
Reference Output. The internal +2.5 V reference is provided at this pin. This is a single ended output
which is referred to AGND. It is a buffered output which is capable of providing 1 mA to an external load.
RTD CURRENT Constant Current Output. A nominal 400
μ
A constant current is provided at this pin, and this can be used
as the excitation current for RTDs. This current can be turned on/off via the control register.
AGND
Ground reference point for analog circuitry.
2
MCLK IN
3
4
MCLK OUT
A0
5
SYNC
6
MODE
7
AIN1(+)
8
9
AIN1(–)
AIN2(+)
AIN2(–)
V
SS
10
11
12
13
AV
DD
V
BIAS
14
REF IN(–)
15
REF IN(+)
16
REF OUT
17
18
相關(guān)PDF資料
PDF描述
AD7711AN LC2MOS Signal Conditioning ADC with RTD Excitation Currents
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD7711AAN 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Analog-to-Digital Converter， 24-Bit
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AD7711AARZ 功能描述:IC ADC 24BIT RTD I SOURCE 24SOIC 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
AD7711AN 功能描述:IC ADC 24BIT RTD I SOURCE 24-DIP RoHS:否 類(lèi)別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 位數(shù):12 采樣率（每秒）:3M 數(shù)據(jù)接口:- 轉(zhuǎn)換器數(shù)目:- 功率耗散（最大）:- 電壓電源:- 工作溫度:- 安裝類(lèi)型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-23-6 包裝:帶卷 (TR) 輸入數(shù)目和類(lèi)型:-
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