AS1528/AS1529
Datasheet - Pinout
4 Pinout
Pin Assignment
Figure 2. Pin Assignments (Top View)
VDD
1
2
3
4
8
7
6
5
SCLK
DOUT
CNVST
REF
AIN1/AIN+
AIN2/AIN-
GND
AS1528/
AS1529
Pin Description
Table 2. Pin Description
Pin Number
Pin Name
Description
Positive Supply Voltage. +2.7V to +5.25V.
Note: Bypass with a 0.1µF capacitor to GND.
1
VDD
Analog Input Channel 1 (AS1529) or Positive Analog Input (AS1528)
Analog Input Channel 2 (AS1529) or Negative Analog Input (AS1528)
Ground
2
3
4
AIN1/AIN+
AIN2/AIN-
GND
External Reference Voltage Input. Sets the analog voltage range.
Note: Bypass with a 4.7µF capacitor to GND.
5
REF
Conversion Start. A rising edge powers up the device and puts the track/
hold circuitry in track mode. At the falling edge of this pin, the device enters
hold mode and begins a conversion.
6
CNVST
Note: This pin also selects the input channel (AS1529) or input polarity
(AS1528).
Serial Data Output. This pin transitions the falling edge of SCLK and goes
low at the start of a conversion and delivers the MSB at the completion of a
conversion.
7
8
DOUT
SCLK
Note: This pin goes high impedance once data has been fully clocked out.
Serial Clock Input. Clocks out data at DOUT with the MSB first.
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