AD7475/AD7495

Rev. B | Page 10 of 24

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

TOP VIEW

(Not to Scale)

8

7

6

5

1

2

3

4

REF IN

GND

SDATA

SCLK

AD7475

CS

Figure 5. AD7475 SOIC/MSOP Pin Configuration

TOP VIEW

(Not to Scale)

8

7

6

5

1

2

3

4

REF OUT

GND

SDATA

SCLK

AD7495

CS

Figure 6. AD7495 SOIC/MSOP Pin Configuration

Table 5. Pin Descriptions

Pin No.

Mnemonic

Function

1 (AD7475)

REF IN

Reference Input for the AD7475. An external reference must be applied to this input. The voltage range for

the external reference is 2.5 V ± 1% for specified performance. A cap of a least 0.1 μF should be placed on the

REF IN pin.

1 (AD7495)

REF OUT

Reference Output for the AD7495. A minimum 100 nF capacitance is required from this pin to GND. The

internal reference can be taken from this pin, but buffering is required before it is applied elsewhere in a

system.

2

Analog Input. Single-ended analog input channel. The input range is 0 to REF IN.

3

GND

Analog Ground. Ground reference point for all circuitry on the AD7475/AD7495. All analog input signals and

any external reference signal should be referred to this GND voltage.

4

SCLK

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 AD7475/AD7495 conversion process.

5

SDATA

Data Out, Logic Output. The conversion result from the AD7475/AD7495 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 consists of four

leading zeros followed by the 12 bits of conversion data, which is provided MSB first.

6

Logic Power Supply Input. The voltage supplied at this pin determines the operating voltage for the serial

interface of the AD7475/AD7495.

7

CS

Chip Select, Active Low Logic Input. This input provides the dual function of initiating conversions on the

AD7475/AD7495 and also frames the serial data transfer.

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