WM8143-12 Wolfson Microelectronics Ltd., WM8143-12 Datasheet

WM8143-12

Manufacturer Part Number

WM8143-12

Description

WM8143 : 10 or 12-BIT, 4MSPS Analogue Front End For CCD Image Sensors

Manufacturer

Wolfson Microelectronics Ltd.

Datasheet

1.WM8143-12.pdf (24 pages)

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Description

The

conditioning required by CCD sensors with a 12-bit ADC.

The WM8143-12 requires minimal external circuitry and

provides a cost-effective sensor to digital domain system

solution.

Each of the three analogue conditioning channels

includes reset level clamp, CDS, fine offset level shifting

and programmable gain amplification. The three channels

are multiplexed into the ADC. The output from the ADC is

fed to the output bus pins OP[11:0] via a 12/8 bit

multiplexer, enabled by the OEB signal.

The flexible output architecture allows twelve-bit data to

be accessed either on a twelve-bit bus or via a time-

multiplexed eight-bit bus. The WM8143-12 can be

configured for pixel-by-pixel or line-by-line multiplexing

operation. Reset level clamp and/or CDS features can be

optionally

programmed either via a simple serial interface or via an

eight-bit parallel interface.

The serial/parallel interfaces of the WM8143-12 are

control compatible with those of the WM8144-10 and

WM8144-12.

Block Diagram

Production Data datasheets contain

final specifications current on

publication date. Supply of products

conforms to Wolfson

Microelectronics' terms and

conditions.

RINP

GINP

BINP

VMID

WM8143-12

bypassed.

VRLC

S/H

integrates

CDS

The

VRU

S/H

VRT

device

MUX

the

Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK

5-BIT REG

Tel: +44 (0) 131 667 9386

PGA

VRB

Wolfson Microelectronics

analogue

configuration

www: http://www.wolfson.co.uk

VMID

email: sales@wolfson.co.uk

8-BIT +

SIGN DAC

8-BIT +

SIGN DAC

8-BIT +

SIGN DAC

12-bit/4MSPS CCD Signal Processor

signal

VSMP

OFFSET

TIMING CONTROL

Fax +44 (0) 131 667 5176

VMID

Features

Applications

MCLK

Reset level clamp

Correlated double sampling (CDS)

Fine offset level shifting

Programmable gain amplification

12-bit ADC with maximum 4 MSPS

Simple clocking scheme

Control by serial or parallel interface

Time multiplexed eight-bit data output mode

32 pin TQFP package

Interface compatible with WM8144-10 and

WM8144-12

Flatbed scanners

Sheet feed scanners

Film scanners

CCD sensor interfaces

Contact image sensor (CIS) interfaces

RLC

AGND

WM8143-12

CONTROL INTERFACE

DGND

12-bit

ADC

SERIAL/PARALLEL

CONFIGURABLE

1999 Wolfson Microelectronics Ltd.

Production Data Nov. 1999 Rev 4

DVDD

AVDD

WM8143-12

OEB

OP[11:0]

SDI / DNA

SCK / RNW

SEN / STB

NRESET

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