WM2148

14-bit 8MSPS Analogue-To-Digital Converter

Production Data, February 2001, Rev 1.1

WOLFSON MICROELECTRONICS LTD

Bernard Terrace, Edinburgh, EH8 9NX, UK

Tel: +44 (0) 131 667 9386

Fax: +44 (0) 131 667 5176

Email: sales@wolfson.co.uk

http://www.wolfson.co.uk

Production Data datasheets contain final

specifications current on publication date.

Supply of products conforms to Wolfson

Microelectronics’ Terms and Conditions.

2001 Wolfson Microelectronics Ltd

.

DESCRIPTION

The WM2148 is a 14-bit, 8 MSPS analogue to digital

converter with an on-chip voltage reference, high bandwidth

sample and hold amplifier and programmable gain. The

analogue input is differential, giving excellent common-

mode noise immunity and low distortion.

The WM2148 is designed for use in highly integrated, low-

power 3.3V

systems.

A

high speed,

microprocessor

compatible parallel interface allows control of the ADC input

gain, digital DC offset, internal / external reference and

output data format. Both binary and two’s complement

formats are supported. The device also features an out of

range indicator pin to show when the input signal exceeds

the converter’s full-scale range.

In Power Down mode, all analogue circuitry is internally

disconnected from the power supply, reducing total supply

current to 20

µA.

The WM2148 is available in a 1mm thin 48-pin TQFP

package in standard commercial and industrial temperature

ranges.

FEATURES

•

14-bit resolution ADC

•

8 MSPS conversion rate

•

Differential input

•

3.3V single supply

•

Very low current power down mode - 20

µA typical

•

Microprocessor compatible parallel interface

•

Internal or external voltage reference

•

High bandwidth sample and hold amplifier

-

140MHz full-power bandwidth

•

Programmable Gain Amplifier (PGA)

•

Programmable DC offset

•

Binary or two’s complement output format

•

Out of range indicator

•

48-pin TQFP package, body thickness 1mm

APPLICATIONS

•

Communications

•

xDSL Front ends

•

Industrial control

•

Instrumentation

BLOCK DIAGRAM

IN+

PARALLEL INTERFACE AND

CONTROL LOGIC

A[1:0]

CSB

WEB

OEB

ADC

+

PGA

-

IN-

D[13:0]

OUTPUT

BUFFERS

REF+

REF-

OVI

CLK

VBG

WM2148

PRECISION

REFERENCE