WM8143-12 データシートの表示（PDF） - Wolfson Microelectronics plc

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WM8143-12

12-bit/4MSPS CCD Signal Processor

Wolfson Microelectronics plc 

WM8143-12

12-bit/4MSPS CCD Signal Processor

Production Data Nov. 1999 Rev 4

Description

The WM8143-12 integrates the analogue signal

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 bypassed. The device configuration is

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.

Features

• 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

Applications

• Flatbed scanners

• Sheet feed scanners

• Film scanners

• CCD sensor interfaces

• Contact image sensor (CIS) interfaces

Block Diagram

VRLC

VRU VRT

VRB

VMID

VSMP MCLK RLC

AGND DGND DVDD AVDD

VMID

RINP

GINP

BINP

CL RS VS

S/H

S/H

CDS

S/H

S/H

CDS

MUX

PGA

5-BIT REG

PGA

5-BIT REG

S/H

S/H

CDS

PGA

5-BIT REG

TIMING CONTROL

OFFSET

+

+

8-BIT +

SIGN DAC

VMID

OFFSET

M

+

+

U

X

8-BIT +

SIGN DAC

VMID

OFFSET

+

+

8-BIT +

SIGN DAC

VMID

WM8143-12

12-bit

ADC

12/8

MUX

CONFIGURABLE

SERIAL/PARALLEL

CONTROL INTERFACE

OEB

OP[11:0]

SDI / DNA

SCK / RNW

SEN / STB

NRESET

Production Data datasheets contain

final specifications current on

publication date. Supply of products

conforms to Wolfson

Microelectronics' terms and

conditions.

Wolfson Microelectronics ©1999 Wolfson Microelectronics Ltd.

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

Tel: +44 (0) 131 667 9386 Fax +44 (0) 131 667 5176

email: sales@wolfson.co.uk

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

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