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XWM8146CDW/V Datasheet

  • XWM8146CDW/V

  • 12-bit(8+4-bit) Linear Sensor Image Processor

  • 17頁(yè)

  • WOLFSON

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WM8146
12-bit (8+4-bit) Linear Sensor Image Processor
Product Preview, January 2000 Rev 1.1
DESCRIPTION
The WM8146 is a 12-bit analogue front end/digitiser IC,
which processes and digitises the analogue output signals
from linear CCD sensors 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. The output from each of these
channels is time multiplexed into a single high-speed 12-bit
Analogue to Digital Converter. The digital output data is
available in 8+4-bit wide multiplexed format, with no missing
codes.
The WM8146 is controlled via a configurable serial
interface, which is compatible with all of Wolfson鈥檚 imaging
devices.
Powered from an analogue supply voltage of 5V and a
digital interface supply of either 5V or 3.3V, the WM8146
typically only consumes 175mW when operating from 5V
supplies.
FEATURES
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No missing codes guaranteed
6MSPS sample rate
Colour pixel by pixel or line by line sampling
Monochrome sampling
Selectable reset level clamp voltage
Pixel by pixel or line by line clamping
Correlated double sampling
5-bit programmable gain amplifier
8-bit + sign offset adjustment
5V or 3.3V digital interface compatibility
Serial control interface
28-pin SOIC package
APPLICATIONS
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Flatbed scanners
Multi-function peripherals
Copier scanners
CCD sensor interfaces
BLOCK DIAGRAM
VRLC
(26)
AVDD
(21)
VRT
(24)
VRB
(23)
VMID
(25)
AGND1
(22)
AGND2
(2)
VSMP
(5)
MCLK
(7)
RLC
(6)
DGND
(8)
DVDD1
(3)
DVDD2
(10)
MUX
TIMING CONTROL
VMID
CL
RS
VS
OFFSET
RINP (1)
S/H
CDS
5-BIT REG
8-BIT +
SIGN DAC
S/H
PGA
+
+
WM8146
VMID
OFFSET
(4) OEB
GINP(28)
S/H
CDS
S/H
PGA
+
+
M
U
X
12-bit
ADC
8+4
MUX
5-BIT REG
8-BIT +
SIGN DAC
(13) OP[0]
(14) OP[1]
(15) OP[2]
(16) OP[3]
(17) OP[4]
(18) OP[5]
(19) OP[6]
(20) OP[7]
VMID
OFFSET
BINP(27)
S/H
CDS
S/H
PGA
5-BIT REG
+
+
CONFIGURABLE
SERIAL CONTROL
INTERFACE
(11)
SDI
(12)
SCK
(9)
SEN
8-BIT +
SIGN DAC
VMID
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.
餂?999
Wolfson Microelectronics Ltd
.

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