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参数资料
| 型号： | AD7400YRWZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 5/20页 |
| 文件大小： | 0K |
| 描述： | IC MODULATOR SIGMA-DELTA 16-SOIC |
| 标准包装： | 400 |
| 类型： | 调制器 |
| 分辨率（位）： | 16 b |
| 采样率（每秒）： | 10M |
| 数据接口： | 串行 |
| 电压电源： | 单电源 |
| 电源电压： | 4.5 V ~ 5.25 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 带卷 (TR) |
Data Sheet
AD7400
Rev. G | Page 13 of 20
THEORY OF OPERATION
CIRCUIT INFORMATION
The AD7400 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 modulator’s single-bit data is
directly proportional to the input signal. Figure 22 shows a
typical application circuit where the AD7400 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 AD7400 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 AD7400. 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 20).
04
718-
01
9
MODULATOR OUTPUT
+FS ANALOG INPUT
–FS ANALOG INPUT
ANALOG INPUT
Figure 20. Analog Input vs. Modulator Output
A differential signal of 0 V results (ideally) 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 pro-
duces a stream of 1s and 0s that are high 81.25% of the time. A
differential input of 200 mV produces a stream of 1s and 0s
that are high 18.75% of the time.
A differential input of 320 mV results in a stream of, ideally, all
1s. This is the absolute full-scale range of the AD7400, while
200 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 Specified Input Range
+200 mV
Zero
0 mV
Negative Specified Input Range
200 mV
Negative Full Scale
320 mV
To reconstruct the original information, this output needs to be
digitally filtered and decimated. A Sinc3 filter is recommended
because this is one order higher than that of the AD7400
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 21 shows the transfer function of the AD7400
relative to the 16-bit output.
04718-020
65535
53248
SPECIFIED RANGE
ANALOG INPUT
ADC
CODE
12288
–320mV
–200mV
+200mV +320mV
0
Figure 21. Filtered and Decimated 16-Bit Transfer Characteristic
04
71
8-
0
18
Σ-
MOD/
ENCODER
INPUT
CURRENT
NONISOLATED
5V/3V
ISOLATED
5V
VDD1
RSHUNT
VIN+
VIN–
GND1
VDD
GND
VDD2
MDAT
SINC3 FILTER
AD7400
MCLKOUT
SDAT
CS
SCLK
MCLK
GND2
DECODER
+
ENCODER
Figure 22. Typical Application Circuit
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| AD7401AYRWZ | 功能描述:IC MODULATOR SIGMA-DELTA 16SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:microPOWER™ 位数:8 采样率（每秒）:1M 数据接口:串行，SPI? 转换器数目:1 功率耗散（最大）:- 电压电源:模拟和数字 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-VQFN 裸露焊盘（4x4） 包装:Digi-Reel® 输入数目和类型:8 个单端，单极 产品目录页面:892 (CN2011-ZH PDF) 其它名称:296-25851-6 |
| AD7401AYRWZ-RL | 功能描述:IC MODULATOR SIGMA-DELTA 16SOIC RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率（每秒）:45k 数据接口:串行 转换器数目:2 功率耗散（最大）:315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端，单极 |
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