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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.
WM8200-10/12
40MSPS ADC with PGA
FEATURES
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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
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Digital Still Cameras
Composite Video Digitisation
Digital Copiers
Digital Video Cameras
BLOCK DIAGRAM
CLAMP
CLAMP
AMPLIFIER
CLAMP
LEVEL
DAC
CONTROL
REGISTERS
SCLK
SDIN
CSB
AINP
AINN
S/H
PGA
ADC
ADC
CORE
Core
OUTPUT
BUFFERS
DO[9:0] WM8200-10
or
DO[11:0] WM8200-12
REFSENSE
VREF
MODE
ON-CHIP
REFERENCE
GENERATOR
TIMING
CONTROL
CLK
DVDD
DGND
WM8200
AVDD
AGND
REFB REFT
WOLFSON MICROELECTRONICS LTD
www.wolfsonmicro.com
Product Preview March 2002, Rev 1.22
Copyright
2002
Wolfson Microelectronics Ltd.
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
