AS1545 datasheet(3/34 Pages) AMSCO

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AS1545

Data Sheet - P i n o u t

4 Pinout

Pin Assignment

Figure 2. Pin Assignments (Top View)

Pin Description

Table 1. Pin Description

Pin Number

Pin Name

Description

1, 29

DGND

Digital Ground. Ground reference point for the digital portion of the

AS1545.

REF_SELECT

Reference select pin. Internal/External Reference Selection. Logic input. If

this pin is tied to DGND, the on-chip 2.5V reference is used as the reference

source for both ADC A and ADC B. In addition, Pin REFA and Pin REFB

must be tied to decoupling capacitors. If the REF SELECT pin is tied to a

logic high, an external reference can be supplied to the AS1545 through the

REFA or REFB pins.

3AVDD

Analog Supply Voltage. 2.7V to 5.25V.

4, 20

REFA, REFB

Reference Input/Output. These pins are connected to the internal

reference through a series resistor and is the reference source for the

AS1545. The nominal reference voltage is 2.5V and appears at the pin. This

pin can be over-driven by an external reference or can be taken as high as

AVDD. Decoupling capacitors (4.7 uF recommended) are connected to

these pins to decouple the reference buffer for each respective ADC.

5AGND

Analog Ground. Decouple point for AVDD. Ground reference for track/hold,

reference, and DAC circuits.

6, 19

AGND

Analog Ground. Decouple point for VREF capacitors and analog input

filters. Pin 6 is the decoupling point for REFA, pin 19 for REFB. Ground

reference for track/hold, reference, and DAC circuits.

7 to 12

AIN0 to AIN5

Analog Inputs of ADC A. These may be programmed as six single-ended

channels, three pseudo-differential or three true-differential analog input

channel pairs.

AS1545

15 16

AIN 0

AIN 1

BIN 1

BIN 0

AGND

REFB

RANGE

SGL/DIFF

AGND

REFA

AVDD

REF_SELECT

DGND

33 Exp. Pad

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