AS1530, AS1531
12-Bit, Single-Supply, Low-Power, 400/300ksps
A/D Converters
austriamicrosystems
Data Sheet
www.austriamicrosystems.com Revision 0.96 1 - 29
1 General Description
The AS1530/AS1531 are low-power, 4/8-channel, 400/
300ksps, 12-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, AS1530; 2.2mA @ 300ksps, AS1531) 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,
AS1530; +2.7 to +3.6V, AS1531). Both devices contain
an internal 2.5V reference, an integrated reference
buffer, and feature support for an external reference (1V
to VDD).
Data accesses are made via the high-speed, 4-wire,
SPI, QSPI-, and Microwire-compatible serial interface.
The devices are available in a 20-pin TSSOP package.
For lower-speed versions of these devices, contact aus-
triamicrosystems, AG regarding the AS1526/AS1527
A/D converters.
Figure 1. Block Diagram and Pin Assignments
2 Key Features
! Single-Supply Operation:
- +4.5 to +5.5V (AS1530)
- +2.7 to +3.6V (AS1531)
! Sampling Rate:
- 400ksps (AS1530)
- 300ksps (AS1531)
! Software-Configurable Analog Input Types:
- 8-Channel Single-Ended
- 8-Channel Pseudo Differential Referenced to COM
- 4-Channel Pseudo Differential
- 4-Channel Fully Differential
! Software-Configurable Input Range
! Internal +2.5V Reference
! Low-Current Operation:
- 2.8mA @ 400ksps (AS1530)
- 2.2mA @ 300ksps (AS1531)
- 0.4mA in Reduced-Power Mode
- 0.5µA in Full Power-Down Mode
! SPI/QSPI/Microwire/TMS320-Compatible
! 20-pin TSSOP Package
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.
AS1530/
AS1531
Control
Logic
Output
Shift
Register
12-Bit
SAR
IN OUT
REF
Analog
Input
+1.2V
REF
Input Shift
Register
Track/
Hold
17kΩ
Av ≈ 2.05
+2.50V
15
SSTRB
17
CSN
14
DOUT
20
VDD1
19
VDD2
13
GND
18
SCLK
16
DIN
1:8
CH0:CH7
9
COM
12
REFADJ
11
REF
10
VDD3
AS1530/
AS1531
1CH0
2CH1
3CH2
4CH3
5CH4
6CH5
7CH6
8CH7
9COM
10VDD3
20 VDD1
19 VDD2
18 SCLK
17 CSN
16 DIN
15 SSTRB
14 DOUT
13 GND
12 REFADJ
11 REF