WM8146 Wolfson Microelectronics Ltd., WM8146 Datasheet

WM8146

Manufacturer Part Number

WM8146

Description

12-bit ( 8+4-bit ) Linear Sensor Image Processor

Manufacturer

Wolfson Microelectronics Ltd.

Datasheet

1.WM8146.pdf (17 pages)

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DESCRIPTION

The WM8146 is a 12-bit analogue front end/digitiser IC,

which processes and digitises the analogue output signals

from linear CCD sensors at pixel sample rates of up to

6MSPS.

The device includes three analogue signal processing

channels each of which contains Reset Level Clamping,

Correlated Double Sampling and Programmable Gain and

Offset adjust functions. The output from each of these

channels is time multiplexed into a single high-speed 12-bit

Analogue to Digital Converter. The digital output data is

available in 8+4-bit wide multiplexed format, with no missing

codes.

The WM8146 is controlled via a configurable serial

interface, which is compatible with all of Wolfson’s imaging

devices.

Powered from an analogue supply voltage of 5V and a

digital interface supply of either 5V or 3.3V, the WM8146

typically only consumes 175mW when operating from 5V

supplies.

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

RINP

GINP(28)

BINP(27)

(1)

VMID

VRLC

(26)

S/H

AVDD

(21)

CDS

S/H

VRT

(24)

MUX

5-BIT REG

PGA

VRB

(23)

12-bit (8+4-bit) Linear Sensor Image Processor

VMID

(25)

8-BIT +

SIGN DAC

8-BIT +

SIGN DAC

8-BIT +

SIGN DAC

AGND1

(22)

OFFSET

AGND2

(2)

TIMING CONTROL

FEATURES

APPLICATIONS

VMID

No missing codes guaranteed

6MSPS sample rate

Colour pixel by pixel or line by line sampling

Monochrome sampling

Selectable reset level clamp voltage

Pixel by pixel or line by line clamping

Correlated double sampling

5-bit programmable gain amplifier

8-bit + sign offset adjustment

5V or 3.3V digital interface compatibility

Serial control interface

28-pin SOIC package

Flatbed scanners

Multi-function peripherals

Copier scanners

CCD sensor interfaces

VSMP

(5)

MCLK

(7)

RLC

(6)

phase of development. These products may

be changed or discontinued without notice.

specifications for products in the formative

DGND

(8)

Product Preview, January 2000 Rev 1.1

Product Preview data sheets contain

W M 8 1 4 6

12-bit

ADC

SERIAL CONTROL

CONFIGURABLE

INTERFACE

1999 Wolfson Microelectronics Ltd

WM8146

(13) OP[0]

(14) OP[1]

(15)

(16)

(17)

(18)

(19)

(20)

(11)

(12)

(4)

(9)

OEB

OP[2]

OP[3]

OP[4]

OP[5]

OP[6]

OP[7]

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