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Revision 1.03

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AS1526/AS1527

4 Pinout and Packaging

Pin Assignments

Figure 2. Pin Assignments (Top View)

Pin Descriptions

Table 1. Pin Descriptions

Pin Number

Pin Name

Description

Positive Supply Voltage. +2.7 to +3.6V

2AIN

3

SHDNN

Three-Level Shutdown Input. Pulling this pin low puts the AS1526/AS1527

in shutdown mode, down to 4µA (max) supply current. The devices are fully

operational with this pin high or floating.

Note: For the AS1526, pulling this pin high enables the internal reference; let-

ting this pin float disables the internal reference allowing for the use of an

external reference. See also pin 4.

4REF

A/D Conversion Reference Voltage. This pin serves as the internal 2.5V

reference output for the AS1526; bypass this pin with a 4.7µF capacitor.

This pin also serves as the external reference voltage input for the AS1527, or

for AS1526 if the internal reference is disabled. Bypass this pin with a

minimum of 0.1µF when using an external reference. See also pin 3.

5GND

Analog and Digital Ground

6DOUT

Serial Data Output. Data changes state at SCLK’s falling edge.

Note: This pin is high-impedance when pin CSN is high.

7CSN

Active-Low Chip Select. The falling edge of this pin initiates a conversion.

Note: When this pin is high, DOUT is high-impedance.

8SCLK

Serial Clock Input. This pin clocks data out at rates up to 2.1MHz.

AS1526/

AS1527

4

REF

3

SHDNN

2

AIN

1

5GND

6 DOUT

7CSN

8SCLK