AD7478A データシートの表示（PDF） - Analog Devices

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AD7478A

2.35 V to 5.25 V, 1 MSPS, 12-/10-/8-Bit ADCs in 6-Lead SC70

Analog Devices 

AD7476A/AD7477A/AD7478A

6-Lead SC70

VDD 1 AD7476A/ 6 CS

GND 2 AD7477A/ 5 SDATA

AD7478A

VIN 3 TOP VIEW 4 SCLK

(Not to Scale)

PIN CONFIGURATIONS

8-Lead MSOP

VDD 1 AD7476A/ 8 VIN

SDATA 2 AD7477A/ 7 GND

CS 3 AD7478A 6 SCLK

TOP VIEW

NC 4 (Not to Scale) 5 NC

NC = NO CONNECT

Mnemonic

CS

VDD

GND

VIN

SDATA

SCLK

NC

PIN FUNCTION DESCRIPTIONS

Function

Chip Select. Active low logic input. This input provides the dual function of initiating conversions on the

AD7476A/AD7477A/AD7478A and also frames the serial data transfer.

Power Supply Input. The VDD range for the AD7476A/AD7477A/AD7478A is from 2.35 V to 5.25 V.

Analog Ground. Ground reference point for all circuitry on the AD7476A/AD7477A/AD7478A. All analog input

signals should be referred to this GND voltage.

Analog Input. Single-ended analog input channel. The input range is 0 V to VDD.

Data Out. Logic output. The conversion result from the AD7476A/AD7477A/AD7478A is provided on this output as a

serial data stream. The bits are clocked out on the falling edge of the SCLK input. The data stream from the AD7476A

consists of four leading zeros followed by the 12 bits of conversion data, which are provided MSB first. The data stream

from the AD7477A consists of four leading zeros followed by the 10 bits of conversion data followed by two trailing

zeros, provided MSB first. The data stream from the AD7478A consists of four leading zeros followed by the 8 bits

of conversion data followed by four trailing zeros, which are provided MSB first.

Serial Clock. Logic input. SCLK provides the serial clock for accessing data from the part. This clock input is also

used as the clock source for the AD7476A/AD7477A/AD7478A’s conversion process.

No Connect.

–10–

REV. C

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