WM8200-10/12
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40MSPS ADC with PGA
DESCRIPTION
FEATURES
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10 or 12-bit resolution ADC
40MSPS conversion rate
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.
Programmable Gain Amplifier (PGA)
Adjustable internal voltage references
Built in clamp function (dc restore) with 10-bit DAC
Wide Input Bandwidth - 900MHz
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.
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
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.
APPLICATIONS
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.
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Digital Still Cameras
Composite Video Digitisation
Digital Copiers
Digital Video Cameras
The WM8200 operates with a single 3V supply and is
supplied in a 28-lead QFN package.
BLOCK DIAGRAM
CLAMP
CLAMP
CLAMP
LEVEL
CONTROL
REGISTERS
AMPLIFIER
SCLK
SDIN
DAC
CSB
AINP
AINN
DO[9:0] WM8200-10
or
DO[11:0] WM8200-12
S/H
PGA
ADC
CORE
Core
ADC
OUTPUT
BUFFERS
TIMING
CONTROL
REFSENSE
VREF
ON-CHIP
REFERENCE
GENERATOR
CLK
MODE
DVDD
DGND
WM8200
AVDD
AGND
REFB REFT
Product Preview March 2002, Rev 1.22
WOLFSON MICROELECTRONICS LTD
Copyright 2002 Wolfson Microelectronics Ltd.
www.wolfsonmicro.com