WM8170 Datasheet, PDF (1/41 Pages) Wolfson Microelectronics plc – 3.3V Integrated Signal Processor for Area Array CCDs

WM8170
3.3V Integrated Signal Processor for Area Array CCDs
Product Preview Rev 1.0 March 2000
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.
BLOCK DIAGRAM
VRB VMID VRT
(15) (16) (14)
BLCENB
(27)
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
SHP SHD CVDD AVDD[1-3] DVDD[1-4] DCLK
(22) (21) (42) (10,11,20) (3,23,33,39) (38)
VCLP (12)
CLPENB (24)
CLPSWB (25)
PIN (19)
DIN (18)
PBLK/HD (26)
Dual Mode Pin
VOUT1 (40)
VOUT2 (41)
REFERENCE
CLAMP
ANALOGUE
BLACK
LEVEL
CLAMP
CDS
S/H
PGA
8-BIT
ADC
8-BIT
ADC
BIAS
CIRCUIT
10-BIT
ADC
TIMING GENERATOR
DIGITAL
BLACK
LEVEL
CLAMP
AND
FILTER
DIGITAL
COMPARATOR
HI-Z
(8) PTDO
(31) OEB
DATA I/O
(1,4-7,44-48)
CONFIGURABLE
SERIAL/PARALLEL
INTERFACE
WM8170
(29) PNS
(36) SEN/STB
(37) SCK/RNW
(35) SDI/DNA
(32) NRESET
(34) SDO
(30) PDB/VD
Dual Mode Pin
(43)
CGND
(9,17)
AGND[1-2]
(13)
ISET
(2,28)
DGND[1-2]
WOLFSON MICROELECTRONICS LTD.
Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK
Tel: [phone]
Fax: [phone]
Email: [e-mail]
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.
© 2000 Wolfson Microelectronics Ltd.