AS1536/AS1537
Datasheet - Pinout
4 Pinout
Figure 2. Pin Assignments (Top View)
VDD
AIN
1
2
3
4
8
7
6
5
SCLK
CSN
AS1536/
AS1537
SHDNN
REF
DOUT
GND
Pin Description
Table 1. Pin Descriptions
Pin Number
Pin Name
VDD
Description
Positive Supply Voltage. +2.7V to +5.25V
Sampling Analog Input. 0V to VREF range.
1
2
AIN
Three-Level Shutdown Input. Pulling this pin low puts the AS1536/AS1537
in shutdown mode, down to 4µA (max) supply current. The devices are fully
operational with this pin high or floating.
3
SHDNN
REF
Note: For the AS1536, 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.
A/D Conversion Reference Voltage. This pin serves as the internal 2.5V
reference output for the AS1536; bypass this pin with a 4.7µF capacitor.
This pin also serves as the external reference voltage input for the AS1537, or
for AS1536 if the internal reference is disabled. Bypass this pin with a
minimum of 0.1µF when using an external reference. See also pin 3.
4
Analog and Digital Ground
5
6
GND
Serial Data Output. Data changes state at SCLK’s falling edge.
Note: This pin is high-impedance when pin CSN is high.
DOUT
Active-Low Chip Select. The falling edge of this pin initiates a conversion.
Note: When this pin is high, DOUT is high-impedance.
7
8
CSN
Serial Clock Input. This pin clocks data out at rates up to 2.1MHz.
SCLK
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