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WM8214SCDS/R Datenblatt(PDF) 12 Page - Wolfson Microelectronics plc

Teilenummer WM8214SCDS/R
Bauteilbeschribung  40MSPS 16 BIT CCD DIGITISER
PDF  35 Pages
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Hersteller  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8214SCDS/R Datenblatt(HTML) 12 Page - Wolfson Microelectronics plc

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WM8214
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PP Rev 1.6 March 2004
12
RESET LEVEL CLAMPING (RLC)
To ensure that the signal applied to the WM8214 lies within the supply voltage range (0V to AVDD)
the output signal from a CCD is usually level shifted by coupling through a capacitor, CIN. The RLC
circuit clamps the WM8214 side of this capacitor to a suitable voltage through a CMOS switch during
the CCD reset period. In order for clamping to produce sensible results the input voltage during the
clamping must be a consistent value.
The WM8214 allows the user to control the RLC switch in a variety of ways as illustrated in Figure 5.
This figure shows a single channel, however all 3 channels are identical, each with its own clamp
switch controlled by the common CLMP signal.
The method of control chosen depends upon the characteristics of the input video. The RLCEN
register bit must be set to 1 to enable clamping, otherwise the RLC switch cannot be closed (by
default RLCEN=1).
CONTROL
INTERFACE
MCLK
VSMP
RSMP
C
IN
RINP
or
GINP
or
BINP
VRLC/
VBIAS
CDACEN
1
0
LEGACY
RLCEN
4-BIT
CDAC
CDAC[4:0]
closed=
50 Ohm
1
0
CLAMPCTRL
0
1
LINEBYLINE
ACYC
LEGACY
TIMING
CL
RLC/ACYC
VSMP
MCLK
EN
RLC
switch
CLMP
Figure 5 RLC Clamp Control Options
When an input waveform has a stable reference level on every pixel it may be desirable to clamp
every pixel during this period. Setting CLMPCTRL=1 means that the RLC switch is closed whenever
the RSMP input pin is high, as shown in Figure 6.
MCLK
VSMP
RSMP
RLC switch control
"CLMP"
(RLCEN=1,CLMPCTRL=0)
RLC switch closed
when RSMP=1
Video sample taken on
fallling edge of VSMP
Reset/reference sample taken
on fallling edge of RSMP
INPUT VIDEO
SIGNAL
reference
("black") level
video level
Figure 6 Reset Level Clamp Operation (CLMPCTRL=0), CDS operation shown, non-CDS also possible



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