XWM8148CFT/V 데이터 시트보기 (PDF) - Wolfson Microelectronics plc

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XWM8148CFT/V

12-bit/12MSPS CCD/CIS Analogue Front End/Digitiser

Wolfson Microelectronics plc 

WM8148

12-bit/12MSPS CCD/CIS Analogue Front End/Digitiser

Production Data, April 1999, Rev 4.0

DESCRIPTION

The WM8148 is a 12-bit, 12MSPS analogue front end/

digitiser IC, which interfaces to colour or monochrome linear

array CCDs or contact image sensors (CIS). The device

includes all the signal conditioning circuitry required to

process the analogue signals from the CCD or CIS prior to

the internal ADC.

Three signal-processing channels are included in the

device. Each channel features reset level clamping,

correlated double sampling (CDS), offset correction and

programmable gain amplification (PGA). The output signal

from each channel is then multiplexed into a high

performance 12-bit analogue to digital converter (ADC).

The reset level clamp and/or CDS functions can be selected

or bypassed depending on the application.

The WM8148 can be operated in several modes. The

operational mode of the device, including the sampling

scheme and power management is programmed via the

serial/parallel control interface.

Output data is presented in either 12-bit parallel or byte-

wide (8+4-bit) format.

FEATURES

• Correlated double sampling

• Programmable gain amplifier

• Programmable input clamp voltage

• Offset correction

• 12-bit, 12MSPS ADC

• Internal voltage reference

• 12-bit or 8+4 bit data output mode

• Single 5V supply or 5V analogue/3.3V digital supply

• Programmable sample timing

• Control interface compatible with previous Wolfson

AFEs

• 48-pin TQFP package

APPLICATIONS

• Flatbed scanners

• Document scanners

• Multi-function peripherals (MFPs)

• Colour copiers

• Character recognition systems

• Linear array CCDs

• Contact image sensors (CIS)

BLOCK DIAGRAM

RLC MCLK VSMP

(2)

(5) (7)

AVDD 1- 4

(41,28,27,3)

DVDD1-2

(1,13)

VRX VRB VRT

(32) (29) (31)

CL RS VS

TIMING CONTROL

VREF/BIAS

WM8148

RINP (36)

GINP (37)

BINP (39)

VRLC (33)

CDS

RLC

CDS

RLC

CDS

RLC

RLC 4

DAC

+

PGA

+

8

OFFSET

DAC

6

S C± AFLUEL L_..2

8

OFFSET

DAC

+

PGA

6

S C± AFLUEL L_..2

+

MUX

12-BIT

ADC

12/8

BIT

MUX

+

PGA

+

8

OFFSET

DAC

6

S C± AFLUEL L_..2

CONFIGURABLE

SERIAL/PARALLEL

CONTROL INTERFACE

(35,40,30,25,6)

AGND1 - 5

(8,24,4,26)

DGND1 - 4

(43) OEB

OP[11:0]

(9-12,14-21)

(48) PNS

(34) OVRD

(45) SDI/DNA

(46) SCK/RNW

(47) SEN/STB

(42) NRESET

(44) SDO

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

http://www.wolfson.co.uk

Production Data contain final

specifications current on publication date.

Supply of products conforms to Wolfson

Microelectronics' Terms and Conditions.

©1999 Wolfson Microelectronics Ltd.

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