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WM8192 Datasheet

  • WM8192

  • (8+8) Bit Output 16-bit CIS/CCD AFE/Digitiser

  • 24頁(yè)

  • WOLFSON

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WM8192
(8 + 8) Bit Output 16-bit CIS/CCD AFE/Digitiser
Product Preview, June 2000, Rev 1.0
DESCRIPTION
The WM8192 is a 16-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 16-bit
Analogue to Digital Converter. The digital output data is
available in 8 or 4-bit wide multiplexed format.
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. An external reference level may also be supplied.
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 WM8192 typically
only consumes 240mW when operating from a single
5V supply.
FEATURES
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16-bit ADC
6MSPS conversion rate
Low power 鈥?240mW 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
8 or 4-bit wide multiplexed data output formats
Internally generated voltage references
28-pin SOIC package
Serial control interface
APPLICATIONS
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Flatbed and sheetfeed scanners
USB compatible scanners
Multi-function peripherals
High-performance CCD sensor interface
BLOCK DIAGRAM
VRLC/VBIAS
(26)
VSMP
(5)
MCLK
(7)
AVDD
(21)
DVDD1 DVDD2
(10)
(3)
VRT VRX VRB
(24) (25) (23)
CL
R
S
V
S
TIMING CONTROL
R
G
B
VREF/BIAS
M
U
X
8
WM8192
(4) OEB
OFFSET
DAC
+
PGA
8
RINP (1)
RLC
M
U
X
CDS
R
G
B
M
U
X
+
I/P SIGNAL
POLARITY
ADJUST
M
U
X
16-
BIT
ADC
DATA
I/O
PORT
(13) OP[0]
(14) OP[1]
(15) OP[2]
(16) OP[3]
(17) OP[4]
(18) OP[5]
(19) OP[6]
(20) OP[7]/SDO
GINP (28)
RLC
CDS
8
+
OFFSET
DAC
PGA
8
+
I/P SIGNAL
POLARITY
ADJUST
BINP (27)
RLC
CDS
8
+
OFFSET
DAC
PGA
8
+
I/P SIGNAL
POLARITY
ADJUST
RLC
DAC
4
CONFIGURABLE
SERIAL
CONTROL
INTERFACE
(9) SEN
(12) SCK
(11) SDI
(6) RLC/ACYC
(22)
AGND1
(2)
AGND2
(8)
DGND
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?000
Wolfson Microelectronics Ltd
.

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