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XWM8148CFT/V Datasheet

  • XWM8148CFT/V

  • 12-bit/12MSPS CCD/CIS Analogue Front End/Digitiser

  • 489.40KB

  • 43頁

  • WOLFSON

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WM8148
12-bit/12MSPS CCD/CIS Analogue Front End/Digitiser
Production Data, April 1999, Rev 4.0
DESCRIPTION
The WM8148 is a 12-bit, 12MSPS analogue front end/
digitiser IC, which interfaces to colour or monochrome linear
array CCDs or contact image sensors (CIS). The device
includes all the signal conditioning circuitry required to
process the analogue signals from the CCD or CIS prior to
the internal ADC.
Three signal-processing channels are included in the
device. Each channel features reset level clamping,
correlated double sampling (CDS), offset correction and
programmable gain amplification (PGA). The output signal
from each channel is then multiplexed into a high
performance 12-bit analogue to digital converter (ADC).
The reset level clamp and/or CDS functions can be selected
or bypassed depending on the application.
The WM8148 can be operated in several modes. The
operational mode of the device, including the sampling
scheme and power management is programmed via the
serial/parallel control interface.
Output data is presented in either 12-bit parallel or byte-
wide (8+4-bit) format.
FEATURES
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Correlated double sampling
Programmable gain amplifier
Programmable input clamp voltage
Offset correction
12-bit, 12MSPS ADC
Internal voltage reference
12-bit or 8+4 bit data output mode
Single 5V supply or 5V analogue/3.3V digital supply
Programmable sample timing
Control interface compatible with previous Wolfson
AFEs
48-pin TQFP package
APPLICATIONS
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Flatbed scanners
Document scanners
Multi-function peripherals (MFPs)
Colour copiers
Character recognition systems
Linear array CCDs
Contact image sensors (CIS)
BLOCK DIAGRAM
RLC
(2)
MCLK VSMP
(5)
(7)
AVDD 1- 4
(41,28,27,3)
DVDD1-2
(1,13)
VRX VRB VRT
(32) (29) (31)
CL R
S
V
S
TIMING CONTROL
VREF/BIAS
WM8148
RINP (36)
CDS
RLC
8
OFFSET
DAC
+
PGA
鹵 FULL
.
_
SCALE
.
2
+
(43) OEB
6
GINP (37)
CDS
RLC
8
OFFSET
DAC
+
PGA
鹵 FULL
.
_
SCALE
.
2
+
MUX
12-BIT
ADC
12/8
BIT
MUX
OP[11:0]
(9-12,14-21)
6
BINP (39)
CDS
RLC
8
OFFSET
DAC
+
PGA
鹵 FULL
.
_
SCALE
.
2
+
(48)
(34)
(45)
(46)
(47)
(42)
(44)
PNS
OVRD
SDI/DNA
SCK/RNW
SEN/STB
NRESET
SDO
6
VRLC (33)
RLC
DAC
4
CONFIGURABLE
SERIAL/PARALLEL
CONTROL INTERFACE
(35,40,30,25,6)
AGND1 - 5
(8,24,4,26)
DGND1 - 4
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
Production Data
contain final
specifications current on publication date.
Supply of products conforms to Wolfson
Microelectronics' Terms and Conditions.
漏1999
Wolfson Microelectronics Ltd
.

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