WM8198 查看數據表（PDF） - Wolfson Microelectronics plc

零件编号

产品描述 (功能)

生产厂家

WM8198

(8 + 8) Bit Output 16-bit CIS/CCD AFE/Digitiser

Wolfson Microelectronics plc 

w

WM8198

(8 + 8) Bit Output 16-bit CIS/CCD AFE/Digitiser

DESCRIPTION

The WM8198 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 three analogue signal processing

channels each of which contains Reset Level Clamping,

Correlated Double Sampling and Programmable Gain and

Offset adjust functions. Three multiplexers allow single

channel processing. The output from each of these

channels is time multiplexed into a single high-speed 16-bit

Analogue to Digital Converter. The digital output data is

available in 8 or 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.

Using an analogue supply voltage of 5V and a digital

interface supply of either 5V or 3.3V, the WM8198 typically

only consumes 195mW when operating from a single

5V supply.

FEATURES

• 16-bit ADC

• 6MSPS conversion rate

• Low power – 212mW typical

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

• Single or 3 channel operation

• Correlated double sampling

• Dual Range Programmable Gain Amplifier (9-bit resolution)

• Programmable offset adjust (8-bit resolution)

• Programmable clamp voltage

• 8 or 4-bit wide multiplexed data output formats

• Internally generated voltage references

• 28-pin SSOP package

• Serial control interface

APPLICATIONS

• Flatbed and sheetfeed scanners

• USB compatible scanners

• Multi-function peripherals

• High-performance CCD sensor interface

BLOCK DIAGRAM

VRLC/VBIAS

VSMP MCLK

AVDD DVDD1 DVDD2

VRT VRX VRB

RINP

GINP

CL

RLC

RLC

RS VS

M

U

X

TIMING CONTROL

CDS

RM 8

GU

X

B

RM

GU

X

B

w

WM8198

VREF/BIAS

OFFSET

DAC

+ PGA

I/P SIGNAL

9

POLARITY

ADJUST

CDS

+ PGA

8

OFFSET

DAC

9

I/P SIGNAL

POLARITY

ADJUST

+

M

+U

X

ADC

DATA

I/O

PORT

OEB

OP[0]

OP[1]

OP[2]

OP[3]

OP[4]

OP[5]

OP[6]

OP[7]/SDO

BINP

RLC

RLC 4

DAC

CDS

+ PGA

+

8

OFFSET

DAC

9

I/P SIGNAL

POLARITY

ADJUST

CONFIGURABLE

SERIAL

CONTROL

INTERFACE

SEN

SCK

SDI

RLC/ACYC

AGND1

AGND2

DGND

WOLFSON MICROELECTRONICS plc

w :: www.wolfsonmicro.com

Production Data, June 2004, Rev 4.0

Copyright 2002 Wolfson Microelectronics plc

Share Link: