10-Bit, 8-Channels, Low Power A/D Converter with 400ksps0 pages

AS1520, AS1521
10-Bit, Single-Supply, Low-Power, 400/300ksps,
8-Channel A/D Converters
Data Sheet
www.austriamicrosystems.com Revision 1.00 1 - 29
1 General Description
The AS1520/AS1521 are low-power, 8/4-channel, 400/
300ksps, 10-bit analog-to-digital (A/D) converters specifically
designed to operate with single-supply devices.
Superior AC characteristics, very low power consumption,
and highly-reliable packaging make these ultrasmall
devices perfect for battery-powered remote-sensor
and data-acquisition devices.
The successive-approximation register (SAR), highspeed
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, AS1520; 2.2mA @ 300ksps, AS1521) and feature
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,
AS1520; +2.7 to +3.6V, AS1521). 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.
Figure 1. Block Diagram and Pin Assignments
2 Key Features
! Single-Supply Operation:
- +4.5 to +5.5V (AS1520)
- +2.7 to +3.6V (AS1521)
! Sampling Rate:
- 400ksps (AS1520)
- 300ksps (AS1521)
! 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 (AS1520)
- 2.2mA @ 300ksps (AS1521)
- 0.4mA in Reduced-Power Mode
- 0.5ìA in Full Power-Down Mode
! SPI/QSPI/Microwire/TMS320-Compatible
! 20-pin TSSOP Package
3 Applications
The devices are ideal for remote sensors, data-acquisition
and data-logging devices, pen-digitizers, process
control, or any other space-limited A/D application with
low power-consumption requirements.
AS1520/
AS1521
Control
Logic
Output
Shift
Register
10-Bit
SAR
IN OUT
REF
Analog
Input
+1.2V
REF
Input Shift
Register
Track/
Hold
17kÙ
Av 2.05
+2.50V
15
SSTRB
17
CSN
14
DOUT
20
VDD1
19
VDD2
13
GND
18
SCLK
16
DIN
1:8
CH0:CH79
COM
12
REFADJ
11
REF
10
VDD3
AS1520/
AS1521
CH0 1
CH1 2
CH2 3
CH3 4
CH4 5
CH5 6
CH6 7
CH7 8
COM 9
VDD3 10
20 VDD1
19 VDD2
18 SCLK
17 CSN
16 DIN
15 SSTRB
14 DOUT
13 GND
12 REFADJ
11 REF