WM8200 Datasheet, PDF (1/16 Pages) Wolfson Microelectronics plc – 40MSPS ADC with PGA

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