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參數(shù)資料
| 型號： | AD7711A* |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | LC2MOS Signal Conditioning ADC with RTD Current Source |
| 中文描述： | LC2MOS信號調(diào)理ADC的電流源電阻 |
| 文件頁數(shù)： | 12/27頁 |
| 文件大小： | 222K |
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REV. C
AD7711A
–12–
Figures 2a and 2b give information similar to that outlined in Table I. In these plots, the output rms noise is shown for the full
range of available cutoffs frequencies rather than for some typical cutoff frequencies as in Tables I and II. The numbers given in
these plots are typical values at +25
°
C.
NOTCH FREQUENCY – Hz
10000
1000
0.110
10000
100
O
m
V
1000
100
10
1
GAIN OF 1
GAIN OF 2
GAIN OF 4
GAIN OF 8
Figure 2a. Plot of Output Noise vs. Gain and Notch
Frequency (Gains of 1 to 8)
CIRCUIT DESCRIPTION
The AD7711A is a sigma-delta A/D converter with on-chip
digital filtering, intended for the measurement of wide dynamic
range, low frequency signals such as those in weigh scale, indus-
trial control or process control applications. It contains a sigma-
delta (or charge balancing) ADC, a calibration microcontroller
with on-chip static RAM, a clock oscillator, a digital filter and a
bidirectional serial communications port.
The part contains two programmable gain differential analog
input channels. The gain range is from 1 to 128 allowing the
part to accept unipolar signals of between 0 mV to +20 mV and
0 V to +2.5 V or bipolar signals in the range from
±
20 mV to
±
2.5 V when the reference input voltage equals +2.5 V. The
input signal to the selected analog input channel is continuously
sampled at a rate determined by the frequency of the master
clock, MCLK IN, and the selected gain (see Table III). A
charge balancing A/D converter (Sigma-Delta Modulator) con-
verts the sampled signal into a digital pulse train whose duty
cycle contains the digital information. The programmable gain
function on the analog input is also incorporated in this sigma-
delta modulator with the input sampling frequency being modi-
fied to give the higher gains. A sinc
3
digital low-pass filter
processes the output of the sigma-delta modulator and updates
the output register at a rate determined by the first notch fre-
quency of this filter. The output data can be read from the serial
port randomly or periodically at any rate up to the output regis-
ter update rate. The first notch of this digital filter (and hence
its –3 dB frequency) can be programmed via an on-chip control
register. The programmable range for this first notch frequency
is from 9.76 Hz to 1.028 kHz, giving a programmable range for
the –3 dB frequency of 2.58 Hz to 269 Hz.
NOTCH FREQUENCY – Hz
10000
1000
0.110
10000
100
O
m
V
1000
100
10
1
GAIN OF 16
GAIN OF 32
GAIN OF 128
GAIN OF 64
Figure 2b. Plot of Output Noise vs. Gain and Notch
Frequency (Gains of 16 to 128)
The basic connection diagram for the part is shown in Figure 3.
This shows the AD7711A in the external clocking mode with
both the AV
DD
and DV
DD
pins of the AD7711A being driven
from the analog +5 V supply. Some applications will have
separate supplies for both AV
DD
and DV
DD
, and in some of
these cases, the analog supply will exceed the +5 V digital sup-
ply (see Power Supplies and Grounding section).
ANALOG
+5V SUPPLY
10
m
F
0.1
m
F
0.1
m
F
AV
DD
DV
DD
AIN1(+)
AIN1(–)
AGND
V
DGND
REF OUT
REF IN(+)
V
BIAS
REF IN(–)
RTD CURRENT
DRDY
TFS
RFS
SDATA
SCLK
A0
MODE
SYNC
MCLK OUT
MCLK IN
AD7711A
DIFFERENTIAL
ANALOG INPUT
DIFFERENTIAL
ANALOG INPUT
ANALOG GROUND
DIGITAL GROUND
DATA READY
TRANSIT (WRITE)
RECEIVE (READ)
SERIAL DATA
SERIAL CLOCK
ADDRESS INPUT
+5V
AIN2(+)
AIN2(–)
Figure 3. Basic Connection Diagram
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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 |
| AD7711* | 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 |
|---|---|
| AD7711AAN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog-to-Digital Converter， 24-Bit |
| AD7711AAR | 功能描述:IC ADC 24BIT RTD I SOURCE 24SOIC 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(biāo)準(zhǔn)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 |
| 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(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(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)目和類型:- |
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