WM8141 Wolfson Microelectronics Ltd., WM8141 Datasheet

WM8141

Manufacturer Part Number

WM8141

Description

WM8141 : 12-BIT 6MSPS Cis/ccd Analogue Front End/digitiser

Manufacturer

Wolfson Microelectronics Ltd.

Datasheet

1.WM8141.pdf (31 pages)

Available stocks

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Price

Company:

BOSTOCK HK LIMITED

Part Number:

WM8141CFT/V

Manufacturer:

WOLFSONM

Quantity:

9 493

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DESCRIPTION

The WM8141 is a 12-bit analogue front end/digitiser that

processes and digitises the analogue output signals from

CCDs or Contact Image Sensors (CIS). The device can be

operated as either a three channel or a single channel

device at pixel sample rates of up to 6MSPS. The device

has both external and programmable internal black level

reference options for CIS operation. The WM8141 runs off a

single supply voltage of either 3.3V or 5V. Alternatively, the

device can be operated from split 5V core and 3.3V digital

interface supplies.

The WM8141 includes three analogue signal processing

channels each of which contains reset level clamping,

correlated double sampling and programmable offset and

gain adjust facilities. Each of these channels is time

multiplexed into a single high-speed 12-bit resolution ADC,

which digitises the pixel image information. The digital data

output is available to the user in either 12-bit parallel or

8/6/4-bit wide multiplexed formats.

The internal control registers are programmable via a

convenient serial or parallel digital interface. The WM8141

typically consumes only 45mA and less than 10 A when in

power down mode.

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 (21)

GINP (20)

BINP (19)

VRLC/VBIAS

(18)

RLC

DAC

RLC

12-bit 6MSPS CIS/CCD Analogue Front End/Digitiser

CDS

VSMP

(27)

TIMING CONTROL

MCLK

(28)

OFFSET

DAC

OFFSET

DAC

OFFSET

DAC

AGND

(13)

FEATURES

APPLICATIONS

AVDD

(12)

PGA

Flatbed and sheetfeed scanners

USB compatible scanners

Multi-function peripherals

CCD sensor interface

Contact image sensor (CIS) interface

12-bit resolution ADC

6MSPS conversion rate at 5V supply

5V or 3.3V single supply or 5V/3.3V dual supply operation

Single or 3 channel operation

Correlated double sampling

Programmable gain (8-bit resolution)

Programmable offset adjust (8-bit resolution)

12-bit parallel or 8/6/4-bit wide multiplexed output bus

Internally generated voltage references

External or internal reference for CIS operation

Low power – 225mW typical at 5V supply

Interface and timing compatible with WM8143, WM8144

Drop in replacement for WM8143-12

32-pin TQFP package

and WM8142 devices

DVDD1

(14)

I/P SIGNAL

POLARITY

VREF/BIAS

ADJUST

DVDD2

(32)

DGND

(29)

Production Data Datasheets contain final

specifications current on publication date.

Microelectronics’ Terms and Conditions.

Supply of products conforms to Wolfson

Production Data, October 2000, Rev 3.0

VRT

(16)

CONFIGURABLE

ADC

2000 Wolfson Microelectronics Ltd.

BIT

VRX

(17)

INTERFACE

PARALLEL

CONTROL

SERIAL/

VRB

(15)

WM8141

PORT

DATA

I/O

WM8141

(22) OEB

(30) OP[0]

(31) OP[1]

(1) OP[2]

(2) OP[3]

(3) OP[4]

(4) OP[5]

(5) OP[6]

(6) OP[7]

(7) OP[8]

(8) OP[9]

(9) OP[10]

(10) OP[11]/SDO

(23) SEN/STB

(25) SCK/RNW

(24) SDI/DNA

(26) RLC/ACYC

(11) NRESET

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