AS1520, AS1521

10-Bit, Single-Supply, Low-Power, 400/300ksps,

8-Channel A/D Converters

Produ ct Brief

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Revision 1.00

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1 General Description

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.

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, 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.

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

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

- 0.5µA 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.

AS1520/

AS1521

Control

Logic

Output

Shift

Register

10-Bit

SAR

IN

OUT

REF

Analog

Input

+1.2V

REF

Input Shift

Register

Track/

Hold

17k

Ω

Av

+2.50V

15

SSTRB

17

CSN

14

DOUT

20

19

13

GND

18

SCLK

16

DIN

1:8

CH0:CH7

9

COM

12

REFADJ

11

REF

10

AS1520/

AS1521

1

CH0

2

CH1

3

CH2

4

CH3

5

CH4

6

CH5

7

CH6

8

CH7

9

COM

10

18 SCLK

17 CSN

16 DIN

15 SSTRB

14 DOUT

13 GND

12 REFADJ

11 REF