AS1536/AS1537
Datasheet - P i n o u t
4 Pinout
Figure 2. Pin Assignments (Top View)
VDD 1
8 SCLK
AIN 2
7 CSN
AS1536/
AS1537
SHDNN 3
6 DOUT
REF 4
5 GND
Pin Description
Table 1. Pin Descriptions
Pin Number
1
2
Pin Name
VDD
AIN
Description
Positive Supply Voltage.
+2.7V to +5.25V
Sampling Analog Input.
0V to V
REF
range.
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.
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.
Analog and Digital Ground
Serial Data Output.
Data changes state at SCLK’s falling edge.
Note:
This pin is high-impedance when pin CSN is high.
Active-Low Chip Select.
The falling edge of this pin initiates a conversion.
Note:
When this pin is high, DOUT is high-impedance.
Serial Clock Input.
This pin clocks data out at rates up to 2.1MHz.
3
SHDNN
4
REF
5
6
7
8
GND
DOUT
CSN
SCLK
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