AS1542

16-Channel, 1 Msps , 12-Bit ADC with Sequencer

Produ ct Brief

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Revision 1.00

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1 General Description

The AS1542 is a 12-bit high-speed, low-power, 16-chan-

nel, successive-approximation ADC that operates from

a single 2.7 to 5.25V supply. The device features high

throughput rates (1Msps) and a low-noise, wide-band-

width track-and-hold amplifier that can handle input fre-

quencies in excess of 1 MHz.

The AS1542 features 16 single-ended or 8 fully differen-

tial analog inputs with a channel sequencer to allow a

programmed selection of channels to be converted

sequentially. The conversion time is determined by the

SCLK frequency (also used as the master clock to con-

trol the conversion).

The conversion process and data acquisition are con-

trolled using a chip select pin and a serial clock signal,

allowing the device to easily interface with microproces-

sors or DSPs. The input signal is sampled on the falling

edge of CSN and conversion is also initiated at this

point. There are no pipeline delays associated with the

device.

The AS1542 uses advanced design techniques to

achieve very low power dissipation at high throughput

rates. At maximum throughput rates, the AS1542 con-

sumes just 2.8mA (@3.6V), and 3.5mA (@5.25V).

By using internal control register, single-ended or fully-

differential conversion mode with different input ranges

can be used with either straight binary or twos comple-

ment output coding.

The device is available in a TSSOP-28 pin package.

Figure 1. Typical Application

2 Key Features

!

2.7 to 5.25V

!

Fast Throughput Rate: 1 Msps

!

Sequencer & Channel Counter

!

Software-Configurable Analog Input Types:

- 16-Channel Single-Ended

- 8-Channel Fully-Differential

!

Software-Configurable Input Range

!

Low Power Consumption at Max Throughput Rates:

- 10.1mW @ 1Msps (3.6V Supply)

- 18.4mW @ 1Msps (5.25V Supply)

!

Shutdown Mode Current: 0.5µA

!

Flexible Power/Serial Clock Speed Management

!

Wide Input Bandwidth: 71dB SNR @ 50 kHz Input

Frequency

!

No Pipeline Delays

!

High Speed SPI/QSPI/Microwire/DSP Interface

!

TSSOP-28 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.

SCLK

AS1542

REFIN

CSN

DOUT

AGND

Multiplexer

16

Track/

Hold

Sequencer

Control

Logic

12-Bit

ADC

DIN

VDRIVE

GND

DGND