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零件编号 | WM8214 | ||
描述 | 40MSPS 16 BIT CCD DIGITISER | ||
制造商 | Wolfson Microelectronics plc | ||
LOGO | |||
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40MSPS 16-bit CCD Digitiser
WM8214
DESCRIPTION
The WM8214 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 40MSPS.
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-bit wide multiplexed format and there is also
an optional single byte output mode, or 4-bit multiplexed
LEGACY mode.
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 3.3V and a digital
interface supply of 3.3V, the WM8214 typically only
consumes 390mW.
BLOCK DIAGRAM
FEATURES
• 16-bit ADC
• 40MSPS conversion rate
• Low power – 390mW typical
• 3.3V single supply operation
• Single, 2 or 3 channel operation
• Correlated double sampling
• Programmable gain (9-bit resolution)
• Programmable offset adjust (8-bit resolution)
• Flexible clamp control with programmable clamp voltage
• Flexible timing, can be made compatible with WM819X
and WM815X parts.
• 8-bit wide multiplexed data output format
• 8-bit only output mode
• 4-bit LEGACY multiplexed nibble mode
• Internally generated voltage references
• 28-pin SSOP package, pin compatible with WM8199
• Serial control interface
APPLICATIONS
• High speed USB2.0 compatible scanners
• Multi-function peripherals
• High-performance CCD sensor interface
• Digital Copiers
VRLC/VBIAS
RSMP VSMP
MCLK
AVDD DVDD1 DVDD2
RINP
CLMP RS VS
RLC
TIMING CONTROL
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WM8214
CDS
RM
GU
X
B
8
OFFSET
DAC
VREF/BIAS
+ PGA
RM
GU
X
B
I/P SIGNAL
9 POLARITY
ADJUST
GINP
RLC
CDS
+ PGA
8 OFFSET
DAC
9 I/P SIGNAL
POLARITY
ADJUST
VRT VRX VRB
+
M
+U
X
16-
BIT
ADC
DATA
O/P
PORT
OEB
OP[0]
OP[1]
OP[2]
OP[3]
OP[4]
OP[5]
OP[6]
OP[7]/SDO
BINP
RLC
RLC 4
DAC
CDS
+ PGA
+
8 OFFSET
DAC
9 I/P SIGNAL
POLARITY
ADJUST
CONFIGURABLE
SERIAL
CONTROL
INTERFACE
SEN
SCK
SDI
WOLFSON MICROELECTRONICS plc
AGND1
AGND2
DGND
Product Preview, March 2004, Rev 1.6
w :: www.wolfsonmicro.com
Copyright 2004 Wolfson Microelectronics plc.
WM8214
INPUT VIDEO SAMPLING
Product Preview
Figure 1 Three-channel CDS Input Video Timing
Figure 2 Two-channel CDS Input Video Timing
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PP Rev 1.6 March 2004
8
WM8214
8
7
6
5
4
3
2
1
0
0 128 256 384
Gain Code (PGA[8:0])
Figure 10 PGA Gain Characteristic
Product Preview
3.5
Max i/p V oltage
LOWREFS=0
3
Max i/p V oltage
LOWREFS=1
2.5
2
1.5
1
0.5
0
512 0
128 256 384
Gain Code (PGA[8:0])
512
Figure 11 Peak Input Voltage to Match ADC Full-scale Range
ADC INPUT BLACK LEVEL ADJUST
The output from the PGA can be offset to match the full-scale range of the differential ADC (2*[VRT-
VRB]).
For negative-going input video signals, a black level (zero differential) output from the PGA should be
offset to the top of the ADC range by setting register bits PGAFS[1:0]=10. This will give an output
code of FFFF (hex) from the WM8214 for zero input. If code zero is required for zero differential
input then the INVOP bit should be set.
For positive going input signals the black level should be offset to the bottom of the ADC range by
setting PGAFS[1:0]=11. This will give an output code of 0000 (hex) from the WM8214 for zero input.
Bipolar input video is accommodated by setting PGAFS[1:0]=00 or PGAFS[1:0]=01. Zero differential
input voltage gives mid-range ADC output, 7FFF (hex).
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PP Rev 1.6 March 2004
16
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页数 | 30 页 | ||
下载 | [ WM8214.PDF 数据手册 ] |
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