WM8191 查看數據表（PDF） - Wolfson Microelectronics plc

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WM8191

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

Wolfson Microelectronics plc 

WM8191

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

Advanced Information, April 2001, Rev 3.1

DESCRIPTION

The WM8191 is a 14-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 14-bit

analogue-to-digital converter. The digital output data is

available in 14-bit parallel or 8/7/4-bit wide multiplexed

format, with no missing codes.

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. Alternatively an external reference level may be

applied. 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 WM8191 typically

only consumes 250mW when operating from a single 5V

supply and less than 1µA when in power down mode.

FEATURES

• 14-bit ADC

• No missing codes guaranteed

• 6MSPS conversion rate

• Low power – 250mW typical

• 5V 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)

• Programmable clamp voltage

• 14-bit parallel or 8/7/4-bit wide multiplexed data output

formats

• Internally generated voltage references

• 48-pin TQFP package

• Serial or parallel control interface

APPLICATIONS

• Flatbed and sheetfeed scanners

• USB compatible scanners

• Multi-function peripherals

• High-performance CCD sensor interface

BLOCK DIAGRAM

VRLC/VBIAS

(2)

VSMP MCLK

(15) (17)

AVDD1-2

(43, 44)

DVDD1-3

(10, 24, 35)

VRT VRX VRB

(48) (1) (47)

RINP (8)

GINP (6)

BINP (4)

CL

RLC

RLC

RLC

RLC 4

DAC

RS VS

M

U

X

TIMING CONTROL

CDS

RM 8

GU

X

B

OFFSET

DAC

+ PGA

RM

8

GU

X

B

VREF/BIAS

I/P SIGNAL

POLARITY

ADJUST

CDS

+ PGA

8

OFFSET

DAC

8

I/P SIGNAL

POLARITY

ADJUST

CDS

+ PGA

8

OFFSET

DAC

8

I/P SIGNAL

POLARITY

ADJUST

WM8191

+

M

+U

X

14-

BIT

ADC

DATA

I/O

PORT

+

CONFIGURABLE

SERIAL/

PARALLEL

CONTROL

INTERFACE

(11) OEB

(21) OP[0]

(22) OP[1]

(23) OP[2]

(26) OP[3]

(27) OP[4]

(28) OP[5]

(29) OP[6]

(31) OP[7]

(32) OP[8]

(33) OP[9]

(34) OP[10]

(37) OP[11]

(38) OP[12]

(39) OP[13]/SDO

(12) SEN/STB

(14) SCK/RNW

(13) SDI/DNA

(16) RLC/ACYC

(42) NRESET

(3, 5, 7, 9, 45, 46)

AGND1-6

(18, 25, 30, 36, 40)

DGND1-5

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

www.wolfsonmicro.com

Advanced Information data sheets contain

preliminary data on new products in the

preproduction phase of development.

Supplementary data will be published at a

later date.

2001 Wolfson Microelectronics Ltd.

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