Data Sheet
AS1520, AS1521
10-Bit, Single-Supply, Low-Power, 400/300ksps,
8-Channel A/D Converters
1 General Description
2 Key Features
ꢀ Single-Supply Operation:
- +4.5 to +5.5V (AS1520)
- +2.7 to +3.6V (AS1521)
The AS1520/AS1521 are low-power, 8/4-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.
ꢀ Sampling Rate:
- 400ksps (AS1520)
- 300ksps (AS1521)
ꢀ Software-Configurable Analog Input Types:
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.
- 8-Channel Single-Ended
- 8-Channel Pseudo Differential Referenced to COM
- 4-Channel Pseudo Differential
- 4-Channel Fully Differential
Both devices require low supply current (2.8mA @
400ksps, AS1520; 2.2mA @ 300ksps, AS1521) and fea-
ture a reduced-power mode and a power-down mode to
lower power consumption at slower throughput rates.
ꢀ 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
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).
ꢀ SPI/QSPI/Microwire/TMS320-Compatible
ꢀ 20-pin TSSOP Package
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.
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.
Figure 1. Block Diagram and Pin Assignments
17
14
Output
Shift
Register
CSN
18
DOUT
15
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
SCLK
16
SSTRB
Input Shift
Register
AS1520/
AS1521
DIN
3
10
VDD3
4
Control
Logic
5
DIN
AS1520/
AS1521
10-Bit
SAR
19
6
1:8
SSTRB
DOUT
VDD2
Analog
Input
Track/
Hold
CH0:CH7
9
IN
OUT
REF
7
20
8
GND
COM
17kΩ
VDD1
+1.2V
REF
REFADJ
9
12
10
REF
Av ≈ 2.05
REFADJ
11
13
+2.50V
REF
GND
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