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AS1520 10-Bit, 8-Channels, Low Power A/D Converter with 400ksps0 pages
AS1520, AS1521
D a ta S he e t
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 ,
8-Channel A/D Converters
1 General Description
2 Key Features
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.
17
Input Shift
Register
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
- 0.5µA in Full Power-Down Mode
!
SPI/QSPI/Microwire/TMS320-Compatible
!
20-pin TSSOP Package
3 Applications
DOUT
15
CH0 1
20 VDD1
19 VDD2
10
CH2 3
18 SCLK
VDD3
AS1520/
AS1521
CH3 4
17 CSN
CH4 5
10-Bit
SAR
Analog
Input
Track/
Hold
IN
19
VDD2
OUT
REF
+1.2V
REF
17kΩ
VDD1
REF
www.austriamicrosystems.com
16 DIN
15 SSTRB
14 DOUT
CH7 8
13 GND
COM 9
12 REFADJ
VDD3 10
Av ≈ 2.05
+2.50V
CH5 6
AS1520/
AS1521
CH6 7
20
COM
REFADJ
11
!
CH1 2
1:8
12
Sampling Rate:
- 400ksps (AS1520)
- 300ksps (AS1521)
SSTRB
Control
Logic
CH0:CH7
9
!
14
Output
Shift
Register
CSN
18
DIN
Single-Supply Operation:
- +4.5 to +5.5V (AS1520)
- +2.7 to +3.6V (AS1521)
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.
Figure 1. Block Diagram and Pin Assignments
SCLK
16
!
11 REF
13
GND
Revision 1.00
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