AS1520/AS1521
Data Sheet
- P i n o u t
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View)
CH0 1
CH1 2
CH2 3
CH3 4
CH4 5
CH5 6
CH6 7
CH7 8
COM 9
V
DD3
10
20 V
DD1
19 V
DD2
18 SCLK
17 CSN
AS1520/
AS1521
16 DIN
15 SSTRB
14 DOUT
13 GND
12 REFADJ
11 REF
Pin Descriptions
Table 1. Pin Descriptions
Pin Number
1:8
9
10
Pin Name
CH0:CH7
COM
V
DD3
Description
Analog Sampling Inputs.
These eight pins serve as analog sampling inputs.
Common Analog Inputs.
Tie this pin to ground in single-ended mode.
Positive Supply Voltage
Reference-Buffer Output/A/DC Reference Input.
This pin serves as the reference
voltage for analog-to-digital conversions. In internal reference mode, the reference
buffer provides a +2.50V nominal output, externally adjustable at pin REFADJ. In
external reference mode, disable the internal buffer by pulling pin REFADJ to V
DD1
.
Reference-Buffer Amplifier Input.
To disable the reference-buffer amplifier, tie this
pin to V
DD1
.
Analog and Digital Ground
Serial Data Output.
Data is clocked out at the rising edge of pin SCLK. DOUT is high
impedance when CSN is high.
Serial Strobe Output.
SSTRB pulses high for one clock period before the MSB is
clocked out. SSTRB is high impedance when CSN is high.
Serial Data Input.
Data is clocked in at the rising edge of SCLK.
Active-Low Chip Select.
Data will not be clocked into pin DIN unless CSN is low.
When CSN is high, pins DOUT and SSTRB are high impedance.
Serial Clock Input.
This pin clocks data into and out of the serial interface, and is used
to set the conversion speed.
Note:
The duty cycle must be between 40 and 60%.
Positive Supply Voltage
Positive Supply Voltage
11
REF
12
13
14
15
16
17
REFADJ
GND
DOUT
SSTRB
DIN
CSN
18
19
20
SCLK
V
DD2
V
DD1
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