參數(shù)資料
型號(hào)： EVAL-AD7400AEDZ
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 5/20頁(yè)
文件大?。?/td> 0K
描述： BOARD EVAL AD7400A
標(biāo)準(zhǔn)包裝： 1
系列： iCoupler®
ADC 的數(shù)量： 1
位數(shù)： 16
采樣率（每秒）： 10M
數(shù)據(jù)接口： 串行
輸入范圍： ±320 mV
在以下條件下的電源（標(biāo)準(zhǔn)）： 95mW @ 10MSPS
工作溫度： -40°C ~ 125°C
已用 IC / 零件： AD7400A
已供物品： 板
Data Sheet
AD7400A
Rev. D | Page 13 of 20
THEORY OF OPERATION
CIRCUIT INFORMATION
The AD7400A isolated Σ-Δ modulator converts an analog input
signal into a high speed (10 MHz typical), single-bit data stream;
the time average of the single-bit data from the modulator is
directly proportional to the input signal. Figure 21 shows a
typical application circuit where the AD7400A is used to provide
isolation between the analog input, a current sensing resistor,
and the digital output, which is then processed by a digital filter
to provide an N-bit word.
ANALOG INPUT
The differential analog input of the AD7400A is implemented
with a switched capacitor circuit. This circuit implements a
second-order modulator stage that digitizes the input signal
into a 1-bit output stream. The sample clock (MCLKOUT)
provides the clock signal for the conversion process as well as
the output data-framing clock. This clock source is internal on
the AD7400A. The analog input signal is continuously sampled
by the modulator and compared to an internal voltage reference. A
digital stream that accurately represents the analog input over
time appears at the output of the converter (see Figure 19).
MODULATOR OUTPUT
+FS ANALOG INPUT
–FS ANALOG INPUT
ANALOG INPUT
07077-
019
Figure 19. Analog Input vs. Modulator Output
A differential signal of 0 V ideally results in a stream of 1s and
0s at the MDAT output pin. This output is high 50% of the time
and low 50% of the time. A differential input of 200 mV produces
a stream of 1s and 0s that are high 81.25% of the time (for a
+250 mV input, the output stream is high 89.06% of the time).
A differential input of 200 mV produces a stream of 1s and 0s
that are high 18.75% of the time (for a 250 mV input, the output
stream is high 10.94% of the time).
A differential input of 320 mV ideally results in a stream of all
1s. This is the absolute full-scale range of the AD7400A, while
250 mV is the specified full-scale range, as shown in Table 9.
Table 9. Analog Input Range
Analog Input
Voltage Input
Full-Scale Range
+640 mV
Positive Full Scale
+320 mV
Positive Typical Input Range
+250 mV
Positive Specified Input Range
+200 mV
Zero
0 mV
Negative Specified Input Range
200 mV
Negative Typical Input Range
250 mV
Negative Full Scale
320 mV
To reconstruct the original information, this output needs
to be digitally filtered and decimated. A Sinc3 filter is recom-
mended because this is one order higher than that of the
AD7400A modulator. If a 256 decimation rate is used, the
resulting 16-bit word rate is 39 kHz, assuming a 10 MHz
internal clock frequency. Figure 20 shows the transfer function
of the AD7400A relative to the 16-bit output.
65535
53248
SPECIFIED RANGE
ANALOG INPUT
ADC
CO
DE
12288
–320mV
–200mV
+200mV
+320mV
0
07077-
020
Figure 20. Filtered and Decimated 16-Bit Transfer Characteristic
Σ-Δ
MOD/
ENCODER
INPUT
CURRENT
NONISOLATED
5V/3V
ISOLATED
5V
VDD1
RSHUNT
VIN+
VIN–
GND1
VDD
GND
VDD2
MDAT
SINC3 FILTER*
AD7400A
MCLKOUT
SDAT
CS
SCLK
MCLK
GND2
DECODER
+
ENCODER
07077-
018
* THIS FILTER IS IMPLEMENTED
WITH AN FPGA OR DSP.
Figure 21. Typical Application Circuit
相關(guān)PDF資料
PDF描述
EBC20DREN-S734 CONN EDGECARD 40POS .100 EYELET
EVAL-AD7262EDZ BOARD EVAL CONTROL AD7262
VE-212-EY CONVERTER MOD DC/DC 15V 50W
EBC20DREH-S734 CONN EDGECARD 40POS .100 EYELET
VE-J1P-EY CONVERTER MOD DC/DC 13.8V 50W
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
EVAL-AD7400EB 制造商:AD 制造商全稱:Analog Devices 功能描述:Isolated Sigma-Delta Modulator
EVAL-AD7400EDZ 功能描述:BOARD EVAL AD7400 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:iCoupler® 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標(biāo)準(zhǔn)）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件
EVAL-AD7401AEDZ 功能描述:BOARD EVAL FOR AD7401 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:iCoupler® 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標(biāo)準(zhǔn)）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件
EVAL-AD7401EB 制造商:AD 制造商全稱:Analog Devices 功能描述:Isolated Sigma-Delta Modulator
EVAL-AD7401EDZ 功能描述:BOARD EVALUATION FOR AD7401 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:iCoupler® 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標(biāo)準(zhǔn)）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*