wm8150scds-r Wolfson Microelectronics plc, wm8150scds-r Datasheet

wm8150scds-r

Manufacturer Part Number

wm8150scds-r

Description

Single Channel 12-bit Cis/ccd Afe With 4-bit Wide Output

Manufacturer

Wolfson Microelectronics plc

Datasheet

1.WM8150SCDS-R.pdf (26 pages)

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DESCRIPTION

The WM8150 is a 12-bit analogue front end/digitiser IC

which processes and digitises the analogue output signals

from CCD sensors or Contact Image Sensors (CIS) at pixel

sample rates of up to 8MSPS.

The device includes a complete analogue signal processing

channel containing Reset Level Clamping, Correlated

Double Sampling, Programmable Gain and Offset adjust

functions. Internal multiplexers allow fast switching of offset

and gain for line-by-line colour processing. The output from

this channel is time multiplexed into a high-speed 12-bit

Analogue to Digital Converter. The digital output data is

available in 4-bit wide multiplexed format.

An internal 4-bit DAC is supplied for internal reference level

generation. This may be used to reference CIS signals or

during Reset Level Clamping to clamp CCD signals. An

external reference level may also be supplied. ADC

references are generated internally, ensuring optimum

performance from the device.

Using an analogue supply voltage of 5V, a digital core

voltage of 5V, and a digital interface supply of either 5V or

3.3V, the WM8150 typically only consumes 160mW when

operating from a single 5V supply.

BLOCK DIAGRAM

WOLFSON MICROELECTRONICS plc

w :www.wolfsonmicro.com

VRLC/VBIAS

VINP

Single Channel 12-bit CIS/CCD AFE with 4-bit Wide Output

RLC

DAC

RLC

CDS

VSMP

TIMING CONTROL

MCLK

AGND1

OFFSET

DAC

AVDD

FEATURES

APPLICATIONS

AGND2

DVDD1

12-bit ADC

8MSPS conversion rate

Low power - 170mW typical

5V single supply or 5V/3.3V dual supply operation

Single channel operation

Correlated double sampling

Programmable gain (8-bit resolution)

Programmable offset adjust (8-bit resolution)

Programmable clamp voltage

4-bit wide multiplexed data output format

Internally generated voltage references

20-pin SSOP package

Serial control interface

Flatbed and sheetfeed scanners

USB compatible scanners

Multi-function peripherals

High-performance CCD sensor interface

PGA

VREF/BIAS

WM8150

DVDD2

I/P SIGNAL

POLARITY

ADJUST

DGND

Production Data, February 2005, Rev 4.1

2005 Wolfson Microelectronics plc

VRT

ADC

BIT

12-

CONFIGURABLE

VRX

INTERFACE

CONTROL

SERIAL

WM8150

VRB

DATA

PORT

I/O

OP[0]

OP[1]

OP[2]

OP[3]/SDO

SEN

SCK

SDI

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