AS1520/AS1521
Data Sheet - Pinout
4 Pinout
Pin Assignments
Figure 2. Pin Assignments (Top View)
1
2
20
19
18
17
16
15
14
13
12
11
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
COM
VDD3
VDD1
VDD2
SCLK
CSN
3
4
5
DIN
AS1520/
AS1521
6
SSTRB
DOUT
7
8
GND
REFADJ
9
10
REF
Pin Descriptions
Table 1. Pin Descriptions
Pin Number
Pin Name
CH0:CH7
COM
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
1:8
9
10
VDD3
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 VDD1.
11
REF
Reference-Buffer Amplifier Input. To disable the reference-buffer amplifier, tie this
pin to VDD1.
12
13
14
REFADJ
GND
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.
DOUT
Serial Strobe Output. SSTRB pulses high for one clock period before the MSB is
clocked out. SSTRB is high impedance when CSN is high.
15
16
17
SSTRB
DIN
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.
CSN
Serial Clock Input. This pin clocks data into and out of the serial interface, and is used
to set the conversion speed.
18
SCLK
Note: The duty cycle must be between 40 and 60%.
Positive Supply Voltage
19
20
VDD2
VDD1
Positive Supply Voltage
www.austriamicrosystems.com
Revision 1.00
3 - 29
AMSCO [ AMS(艾迈斯) ]
