AS1545_1 AMSCO [austriamicrosystems AG], AS1545_1 Datasheet - Page 3

• Manufacturer Part Number: AS1545_1
• Description: Dual, 12-Bit, 1MSPS, SAR ADC
• Manufacturer: AMSCO [austriamicrosystems AG]

AS1545
Datasheet - P i n o u t
4 Pinout
Pin Assignment
Figure 2. Pin Assignments (Top View)
Pin Description
Table 1. Pin Description
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Pin Number
7 to 12
1, 29
4, 20
6, 19
2
3
5
REF_SELECT
AIN0 to AIN5
REF
Pin Name
DGND
AGND
AGND
REF_SELECT
AV
A
, REF
DD
DGND
AGND
AVDD
REFA
AGND
AIN 0
AIN 1
B
1
2
3
4
5
6
7
8
Digital Ground. Ground reference point for the digital portion of the
AS1545.
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
REF
Analog Supply Voltage. 2.7V to 5.25V.
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
AV
these pins to decouple the reference buffer for each respective ADC.
Analog Ground. Decouple point for AV
reference, and DAC circuits.
Analog Ground. Decouple point for V
filters. Pin 6 is the decoupling point for REFA, pin 19 for REFB. Ground
reference for track/hold, reference, and DAC circuits.
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.
32
9
DD
A
10
31
. Decoupling capacitors (4.7 uF recommended) are connected to
or REF
30
11 12
AS1545
Revision 1.01
29
B
pins.
33 Exp. Pad
28
13 14 15 16
27
26
25
24
22
19
18
17
23
21
20
Description
SGL/DIFF
RANGE
BIN 0
BIN 1
A1
A2
REFB
AGND
REF
DD
. Ground reference for track/hold,
capacitors and analog input
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