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WM8200-10/12

40MSPS ADC with PGA

WOLFSON MICROELECTRONICS LTD

www.wolfsonmicro.com

Product Preview March 2002, Rev 1.22

Copyright

2002 Wolfson Microelectronics Ltd.

DESCRIPTION

The WM8200 is a CMOS high speed, low power, pipeline

analogue-to-digital converter (ADC) with 10 or 12-bit output

options. It also has an on-chip programmable gain amplifier

(PGA), dc clamp circuit and internal voltage references.

Conversion is controlled by a single clock input.

The device has a high bandwidth differential sample and hold

input, which gives excellent common-mode noise immunity

and low distortion.

Alternatively, it can be driven in single

ended fashion with an optional voltage clamp for dc

restoration that can take its reference from an on-chip 10-bit

DAC.

The WM8200 provides internal reference voltages for setting

the ADC full-scale range without the requirement for external

circuitry. However, it can also accept external references for

applications where shared or high-precision references are

required.

A 3-wire serial interface is used to control the device and a

10 or 12-bit parallel interface is to read ADC conversion data.

ADC data can be output in unsigned binary or two’s

complement format.

The WM8200 operates with a single 3V supply and is

supplied in a 28-lead QFN package.

FEATURES

•

10 or 12-bit resolution ADC

•

40MSPS conversion rate

•

Programmable Gain Amplifier (PGA)

•

Adjustable internal voltage references

•

Built in clamp function (dc restore) with 10-bit DAC

•

Wide Input Bandwidth - 900MHz

•

Unsigned Binary or Two’s complement output format

•

Programmable via 3-wire serial MPU interface

•

Single 3V supply operation

•

Low power - 100mW typical at 3.0V supplies

•

Powerdown mode to <0.1mW typical

•

28 lead QFN package

APPLICATIONS

•

Digital Still Cameras

•

Composite Video Digitisation

•

Digital Copiers

•

Digital Video Cameras

BLOCK DIAGRAM

AINP

ON-CHIP

REFERENCE

GENERATOR

ADC

Core

S/H

PGA

AINN

DO[9:0] WM8200-10

or

DO[11:0] WM8200-12

OUTPUT

BUFFERS

MODE

REFSENSE

AGND

AVDD

REFB

REFT

DGND

DVDD

SDIN

TIMING

CONTROL

CLK

VREF

WM8200

CSB

SCLK

CLAMP

AMPLIFIER

CLAMP

REGISTERS

CONTROL

CLAMP

LEVEL

DAC

ADC

CORE