Camera Block(Image Signal Processing Lens Control) - Panasonic BB-HCM580A Service Manual

4.2. Camera Block(Image signal processing, LENS control)
[CCD Board, VIDEO Board]
• IC701 is a CCD image sensor of approximately 320 thousand pixels, which outputs the image signal (CCD_OUT) of an VGA
(640x480) size.
• IC803: This IC is to remove noise in the CCD_OUT signal, adjust the gain and output the 10-bit data (AFE_D[9:0]).
The pixel clock (PCLK: 12.2727MHz) and CCD_Hdrive signal are output based on the timing of the synchronizing signals
(HD_AFE and VD_AFE) that are generated by the CLOCK signal from the IC804.The synchronizing signals (HD_AFE and
VD_AFE) are output from the CPU (IC102) on the CPU board.
The pixel clock (PCLK) and 10-bit data (AFE_D [9:0]) that are output from the IC803 are entered in the LVDS Transmitter IC
on IC806, and after being parallel-serial converted, they are converted into the two-wire differential signals. Then the signals
are transmitted to the LVDS Receiver IC (IC121) on the CPU board. In the LVDS Receiver IC (IC121), the signals are then
serial-parallel converted to recover the pixel clock and the 10-bit data, which are entered into the CPU (IC102). (Refer to Fig.
1.)
• Frequency of the IC803 clock (CLOCK signal) is 24.5454MHz and the clock signal is generated in the IC804 based on timing of
the crystal oscillator (X801).
• The IC803 is controlled by the serial signals (CS_AFE, SDI, and SCL) in the CPU (IC102).
The SDI and SCL signals in the serial signals are shared and used in the DA converter (IC903) and the motor driver (IC901)
that are mounted on the LENS board. (Refer to Fig. 2.)
• Hard reset (RESET) of IC803 is controlled by GPIO of IC102 on the CPU board.
• IC802 receives the V drive timing signals (Vdrive: CH1, CH2, and XV1-XV4) from the IC803, and outputs the IC701 (CCD) drive
V drive signal (CCD_Vdrive: V1-V4).
• The power supplies used in the camera unit are generated +15V and -5.5V in the IC801 and +3.3V from the +5.7V power sup-
plied from the TILT board.
The power supplies are generated +15V and -5.5V in the IC801 and +3.3V and -0.4V in the IC809 for driving the CCD.
Figure 1 Video Signal Transmission via LVDS
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BB-HCM580A