WM2152

12-bit, 30MSPS ADC

Product Preview, March 2001, Rev 1.1

WOLFSON MICROELECTRONICS LTD

Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK

Tel: +44 (0) 131 667 9386

Fax: +44 (0) 131 667 5176

Email: sales@wolfson.co.uk

www.wolfsonmicro.com

Product Preview data sheets contain

specifications for products in the formative

phase of development. These products may

be changed or discontinued without notice.

2001 Wolfson Microelectronics Ltd

.

DESCRIPTION

The WM2152 is a high speed 12-bit analogue-to-digital

converter operating on a 3.3V supply. This device includes

a high bandwidth sample and hold and internal voltage

references. Conversion is controlled by a single clock input.

The device has a differential sample and hold input which

gives excellent common-mode noise immunity and low

distortion. The maximum differential input voltage can be

set by the user, via two mode selection pins, to be 1V or 2V.

A third PGA mode is designed particularly for single-ended

input signals such as composite video sources. Single-

ended input signals require one side of the differential input

to be tied to an external voltage source.

The device provides internal reference voltages for setting

the ADC full-scale range without the requirement for

external circuitry.

The WM2152 can also accept external

reference levels for applications where common or high

precision references are required.

The WM2152 provides an out of range indicator flag to

indicate when the input signal exceeds the converter’s full

scale range. An output enable pin allows several devices to

share a common bus. Power down mode for the device is

under the control of the two mode control pins and takes

power consumption down to less than 36

µW.

FEATURES

•

12-bit resolution ADC

•

30MSPS conversion rate

•

Programmable Gain Amplifier (PGA)

•

Out of range indicator

•

Low power - 160mW typical at 3.3V supplies

•

Powerdown mode to 30

µW typical

•

66dB SNR for 3.58MHz input signal

•

-78db THD for 3.58MHz input signal

•

28-pin TSSOP package

APPLICATIONS

•

Direct IF sampling

•

Baseband digitisation

•

Video Digitisation

•

Portable instrumentation

•

Digital imaging

•

High speed data acquisition

BLOCK DIAGRAM

VINP (5)

PRECISION

REFERENCE

CIRCUITS

ADC

+

PGA

-

VINM (6)

D[11:0]

(12-18, 21-25)

OUTPUT

BUFFERS

(11) OVRNG

AVDD

(8, 27)

(9)

VRT

(10)

VRB

(26) OEB

(19) DGND

(20) DVDD

TIMING

CONTROL

(28) CLK

CONFIGURATION

CONTROL CIRCUIT

CON0 (3)

CON1 (2)

EXTREF (4)

AVDD

(1,7)

WM2152