WM8148 Wolfson Microelectronics Ltd., WM8148 Datasheet

WM8148

Manufacturer Part Number

WM8148

Description

WM8148 : 12-BIT/12 MSPS Ccd/cis Analogue Front End/digitiser

Manufacturer

Wolfson Microelectronics Ltd.

Datasheet

1.WM8148.pdf (43 pages)

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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.

BLOCK DIAGRAM

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

VRLC (33)

BINP (39)

RINP (36)

GINP (37)

CL R

RLC

DAC

(2)

CDS

RLC

CDS

RLC

CDS

RLC

MCLK

(5)

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

TIMING CONTROL

VSMP

(7)

OFFSET

DAC

(35,40,30,25,6)

AGND1 - 5

(41,28,27,3)

AVDD 1- 4

PGA

SCALE 2

± FULL

FEATURES

APPLICATIONS

. .

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

Flatbed scanners

Document scanners

Multi-function peripherals (MFPs)

Colour copiers

Character recognition systems

Linear array CCDs

Contact image sensors (CIS)

(8,24,4,26)

DGND1 - 4

DVDD1-2

VREF/BIAS

(1,13)

MUX

VRX

(32)

specifications current on publication date.

CONTROL INTERFACE

Supply of products conforms to Wolfson

Microelectronics' Terms and Conditions.

SERIAL/PARALLEL

VRB

12-BIT

(29)

CONFIGURABLE

ADC

Production Data, April 1999, Rev 4.0

VRT

(31)

1999 Wolfson Microelectronics Ltd

Production Data contain final

MUX

12/8

WM8148

BIT

WM8148

(43) OEB

(48) PNS

(34) OVRD

(45) SDI/DNA

(47) SEN/STB

(42) NRESET

(44) SDO

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