WM8253SCDS/V Wolfson Microelectronics Ltd., WM8253SCDS/V Datasheet

WM8253SCDS/V

Manufacturer Part Number

WM8253SCDS/V

Description

Specifications: Manufacturer: Wolfson Microelectronics ; Product Category: ADC (A/D Converters) ; RoHS: Details ; Number of Converters: 1 ; Number of ADC Inputs: 1 ; Conversion Rate: 6 MSPs ; Resolution: 16 bit ; Input Type: Voltage ; Interface

Manufacturer

Wolfson Microelectronics Ltd.

Datasheet

1.WM8253SCDSV.pdf (27 pages)

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Bonase Electronics (HK) Co., Limited

Part Number:

WM8253SCDS/V

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Wolfson Microelectronics

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DESCRIPTION

The WM8253 is a 16-bit analogue front end/digitiser IC

which processes and digitises the analogue output signals

from CCD sensors or Contact Image Sensors (CIS) at pixel

sample rates of up to 6MSPS.

The device includes a complete signal processing channel

containing Reset Level Clamping, Correlated Double

Sampling, Programmable Gain and Offset adjust functions.

Internal multiplexers allow fast switching of offset and gain

for line-by-line colour processing. The output from this

channel is time multiplexed into a high-speed 16-bit

Analogue to Digital Converter. The digital output data is

available in 4-bit wide multiplexed format.

An internal 4-bit DAC is supplied for internal reference level

generation. This may be used during CDS to reference CIS

signals or during Reset Level Clamping to clamp CCD

signals. An external reference level may also be supplied.

ADC references are generated internally, ensuring optimum

performance from the device.

The device uses an analogue supply voltage of 3.3V and a

digital interface supply of between 2.5V and 3.3V.

WM8253 typically only consumes 132mW when operating

from a single 3.3V supply.

BLOCK DIAGRAM

WOLFSON MICROELECTRONICS plc

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VRLC/VBIAS

VINP

Single Channel 16-bit CIS/CCD AFE with 4-bit Wide Output

TIMING GENERATION AND CONTROL

RLC

DAC

RLC

VSMP

CDS

MCLK

http://www.wolfsonmicro.com/enews

AGND1

OFFSET

DAC

MUX

The

WM8253

AVDD

AGND2

FEATURES



APPLICATIONS



PGA

MUX

16-bit ADC

6MSPS conversion rate

Low power - 132mW typical

3.3V single supply or 3.3V/2.5V dual supply operation

Single channel operation

Correlated double sampling

Programmable gain (8-bit resolution)

Programmable offset adjust (8-bit resolution)

Programmable clamp voltage

4-bit wide multiplexed data output format

Internally generated voltage references

20-lead SSOP package

Serial control interface

Flatbed and sheetfeed scanners

USB compatible scanners

Multi-function peripherals

High-performance CCD sensor interface

VREF/BIAS

I/P SIGNAL

POLARITY

ADJUST

DVDD1

DGND

DVDD2

Production Data, August 2011, Rev 4.1

VRT

16-BIT

ADC

CONFIGURABLE

INTERFACE

CONTROL

SERIAL

VRB

WM8253

DATA

PORT

I/O

OP[0]

OP[1]

OP[2]

OP[3]/SDO

SDI

SCK

SEN

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