Datasheet > ADUM7701-8BRIZ-RL7

ADUM7701-8BRIZ-RL7

更新时间： 2022-02-26 10:32:43

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
22页	485K
描述
16-Bit, Isolated, Sigma-Delta Modulator

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ADuM7701

Data Sheet

THEORY OF OPERATION

A differential signal of 0 V ideally results in a stream of

CIRCUIT INFORMATION

alternating 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 250 mV produces a stream of 1s and 0s that are high

89.06% of the time. A differential input of −250 mV produces a

stream of 1s and 0s that are high 10.94% of the time.

The ADuM7701 isolated Σ-Δ modulator converts an analog

input signal to a high speed (21 MHz maximum), single-bit data

stream. The time average single-bit data from the modulator is

directly proportional to the input signal. Figure 25 shows a

typical application circuit where the ADuM7701 provides

isolation between the analog input, a current sensing resistor

or shunt, and the digital output, which is then processed by a

digital filter to provide an N-bit word.

A differential input of 320 mV ideally results in a stream of all

1s. A differential input of −320 mV ideally results in a stream of

all 0s. The ADuM7701 absolute full-scale range is 320 mV, and

the specified full-scale performance range is 250 mV, as shown

in Table 13.

ANALOG INPUT

The pseudo differential analog input of the ADuM7701 is

implemented with a switched capacitor circuit. This circuit

implements a second-order modulator stage that digitizes the

input signal to a single-bit output stream. The sample clock

(MCLKIN) provides the clock signal for the conversion process

as well as the output data framing clock. This clock source is

externally supplied to the ADuM7701. 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 26).

Table 13. Analog Input Range

Analog Input

Positive Full-Scale (+FS) Value

Positive Specified Performance

Zero

Negative Specified Performance

Negative Full-Scale (−FS) Value

Voltage Input (mV)

+320

+250

−250

−320

FLOATING

POWER SUPPLY

NONISOLATED

5V/3.3V

–400V

GATED

DRIVE

CIRCUIT

10µF 100nF

ADuM7701

DD1

DD2

SINC3 FILTER*

5.1V

220pF

10Ω

Σ-Δ

MOD/

MDAT

MCLK

DECODER

ENCODER

IN+

ENCODER

SCLK

SDAT

SHUNT

10Ω

MCLKIN

MOTOR

IN–

220pF

FLOATING

POWER SUPPLY

100nF

10µF

DECODER

GND

GATED

DRIVE

CIRCUIT

*THIS FILTER IS IMPLEMENTED

WITHAN FPGA OR DSP

–400V

Figure 25. Typical Application Circuit

MODULATOR OUTPUT

+FS ANALOG INPUT

–FS ANALOG INPUT

ANALOG INPUT

Figure 26. Analog Input vs. Modulator Output

Rev. 0 | Page 16 of 22

1...13 14 151617 18 19...22

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与ADUM7701-8BRIZ-RL7相关器件

型号	品牌	获取价格	描述	数据表
ADUM7701BRWZ	ADI	获取价格	16-Bit, Isolated, Sigma-Delta Modulator
ADUM7701BRWZ-RL	ADI	获取价格	16-Bit, Isolated, Sigma-Delta Modulator
ADUM7701BRWZ-RL7	ADI	获取价格	16-Bit, Isolated, Sigma-Delta Modulator
ADUM7702	ADI	获取价格	16-Bit, Isolated, Sigma-Delta Modulator
ADUM7702-8BRIZ	ADI	获取价格	16-Bit, Isolated, Sigma-Delta Modulator
ADUM7702-8BRIZ-RL	ADI	获取价格	16-Bit, Isolated, Sigma-Delta Modulator
ADUM7702-8BRIZ-RL7	ADI	获取价格	16-Bit, Isolated, Sigma-Delta Modulator
ADUM7702BRWZ	ADI	获取价格	16-Bit, Isolated, Sigma-Delta Modulator
ADUM7702BRWZ-RL	ADI	获取价格	16-Bit, Isolated, Sigma-Delta Modulator
ADUM7702BRWZ-RL7	ADI	获取价格	16-Bit, Isolated, Sigma-Delta Modulator

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