AS1522, AS1523
1 0 - B i t , S i n g l e - S u p p l y, L o w - P o w e r, 4 0 0 / 3 0 0 k s ps ,
4-Channel A/D Converters
Product Brief
1 General Description
The AS1522/AS1523 are low-power, 4/2-channel, 400/
300ksps, 10-bit analog-to-digital (A/D) converters specif-
ically designed to operate with single-supply devices.
Superior AC characteristics, very low power consump-
tion, and highly-reliable packaging make these ultra-
small devices perfect for battery-powered remote-sen-
sor and data-acquisition devices.
The successive-approximation register (SAR), high-
speed sampling, high-bandwidth track/hold circuitry, and
multi-mode operation combine to make these devices
highly-flexible and configurable.
Both devices require low supply current (2.8mA @
400ksps, AS1522; 2.2mA @ 300ksps, AS1523) and fea-
ture a reduced-power mode and a power-down mode to
lower power consumption at slower throughput rates.
The devices operate from a single supply (+4.5 to +5.5V,
AS1522; +2.7 to +3.6V, AS1523). Both devices contain
an internal 2.5V reference, an integrated reference
buffer, and feature support for an external reference (1V
to V
DD
).
Data accesses are made via the high-speed, 4-wire,
SPI, QSPI-, and Microwire-compatible serial interface.
The devices are available in a 16-pin TSSOP package.
2 Key Features
!
Single-Supply Operation:
- +4.5 to +5.5V (AS1522)
- +2.7 to +3.6V (AS1523)
Sampling Rate:
- 400ksps (AS1522)
- 300ksps (AS1523)
Software-Configurable Analog Input Types:
- 4-Channel Single-Ended
- 4-Channel Pseudo Differential Referenced to COM
- 2-Channel Pseudo Differential
- 2-Channel Fully Differential
Software-Configurable Input Range
Internal +2.5V Reference
Low-Current Operation:
- 2.8mA @ 400ksps (AS1522)
- 2.2mA @ 300ksps (AS1523)
- 0.4mA in Reduced-Power Mode
- 0.5µA in Full Power-Down Mode
SPI/QSPI/Microwire/TMS320-Compatible
16-pin TSSOP Package
!
!
!
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3 Applications
The devices are ideal for remote sensors, data-acquisi-
tion and data-logging devices, pen-digitizers, process
control, or any other space-limited A/D application with
low power-consumption requirements.
11
Figure 1. Block Diagram and Pin Assignments
14
CSN
15
SCLK
13
DIN
Input Shift
Register
Output
Shift
Register
DOUT
12
SSTRB
V
DD1
1
CH0 2
CH1 3
CH2 4
16 V
DD2
15 SCLK
14 CSN
AS1522/
AS1523
12-Bit
SAR
7
V
DD3
16
V
DD2
Control
Logic
2:5
CH0:CH3
6
COM
+1.2V
REF
Analog
Input
Track/
Hold
17kΩ
Av
≈
2.05
+2.50V
IN
CH3 5
COM 6
V
DD3
7
REF 8
AS1522/
AS1523
13 DIN
12 SSTR
11 DOUT
10 GND
9 REFADJ
OUT
REF
1
V
DD1
9
REFADJ
8
REF
10
GND
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AMSCO [ AUSTRIAMICROSYSTEMS AG ]
