WM8170 datasheet(1/41 Pages) WOLFSON

tên linh kiện	WM8170

Giải thích chi tiết về linh kiện	3.3V Integrated Signal Processor for Area Array CCDs

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nhà sản xuất	WOLFSON [Wolfson Microelectronics plc]

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WM8170

3.3V Integrated Signal Processor for Area Array CCDs

Product Preview Rev 1.0 March 2000

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

Product Preview data sheets contain

specifications for products in the formative

phase of development. These products may

be changed or discontinued without notice.

.

DESCRIPTION

The WM8170 is a 10-bit analogue front end/digitiser IC,

which processes and digitises the analogue output signals

from area array CCD sensors at pixel sample rates of up to

21MSPS.

The device contains input blanking, correlated double

sampling (CDS), programmable gain amplifier, black level

clamp, on-board voltage reference and a 10-bit, 21MSPS

ADC. Two auxiliary 8 bit DACs are provided which may be

used for bias voltage control or camera functions such as

auto-focus.

Fine black level adjustment is performed digitally after the

ADC. This digital adjustment will follow DC shifts in the video

input without introducing digital correction noise into the

image.

The WM8170 is designed to interface to a wide range of area

array CCDs and can operate at lower power for slower

sample rates by setting the reference bias current via an

external resistor connected to the ISET pin.

All signal timing within the device is derived from the CCD

clock signals. The WM8170 is controlled via a configurable

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

imaging devices.

The user is able to control the device functions and monitor

on-chip

register

settings

via

the

easy-to-use

digital

management interface.

FEATURES

• 10-bit, 21MSPS ADC

• No missing codes guaranteed

• Correlated double sampling

• Programmable gain amplifier

• Black level clamp

• Input blanking

• Two auxiliary 8-bit DACs

• Power save mode

• Serial or parallel control bus

• Adjustable sample rate

• User selectable sampling on rising or falling edge

of clocks

• Single 3.3V power supply (3V minimum)

• 48-pin TQFP package

• Standby mode ICC<10µA

• Power consumption typically 190mW at 12MHz,

270mW at 21MHz

APPLICATIONS

• Digital still cameras

• Digital camcorders

• PC cameras

• Progressive scan CCDs

• NTSC, PAL interline CCDs

BLOCK DIAGRAM

TIMING GENERATOR

REFERENCE

VRT

(14)

VRB

(15)

VMID

(16)

BLCENB

(27)

VCLP (12)

CLPENB (24)

CLPSWB (25)

CLAMP

DIN (18)

PIN (19)

CDS

S/H

PBLK/HD (26)

Dual Mode Pin

DIGITAL

BLACK

LEVEL

CLAMP

AND

FILTER

10-BIT

ADC

PGA

ANALOGUE

BLACK

LEVEL

CLAMP

CONFIGURABLE

SERIAL/PARALLEL

INTERFACE

(8) PTDO

(31) OEB

DATA I/O

(1,4-7,44-48)

SHP

(22)

SHD

(21)

CVDD

(42)

AVDD[1-3]

(10,11,20)

DVDD[1-4]

(3,23,33,39)

DCLK

(38)

HI-Z

DIGITAL

COMPARATOR

8-BIT

ADC

8-BIT

ADC

VOUT1 (40)

VOUT2 (41)

BIAS

CIRCUIT

(29) PNS

(36) SEN/STB

(37) SCK/RNW

(35) SDI/DNA

(32) NRESET

(34) SDO

(30) PDB/VD

Dual Mode Pin

(13)

ISET

(2,28)

DGND[1-2]

(9,17)

AGND[1-2]

(43)

CGND

WM8170

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