Circuit Description - Sony HDCAM HDW-F900R Maintenance Manual

1-26. Circuit Description

1-26-1. CCD Block (TG-256 Board, DR-614
Board, BI-199/200/201 Board, and
PA-340 Board)
TG-256 board
Among the CCD driving pulses, the horizontal drive pulse
is sent to the BI-199/200/201 board through the DR-614
board, and the sampling pulse that samples the CCD output
signal is output to the PA-340 board. The drive pulses are
generated in synchronism with the H_PHASE that is input
from the DCP-43 board. The respective drive pulses are
generated from the VCO clock signal (X1 : 74.1758 MHz
and X2 : 74.25 MHz) on this board. The clock signal for
the digital circuit of this unit is also output via the LVDS
driver (IC17).
DR-614 board
Among the CCD driving pulses, the vertical drive pulse is
generated in this board and is converted by IC19 such that
the vertical drive pulse can drive the CCD directly. The
converted pulse is sent to the CCD through the BI-199/
200/201 board. The drive pulses are output in synchronism
with the H_PHASE and FRM_RST signals that are input
from the DCP-43 board. At the same time, the data such as
the V-sub voltage of the CCD are stored in the EEPROM
(IC31) of the DR-614 board. The DR-614 board has an
interface circuit with the optical filter.
BI-199/200/201 board
Among the CCD driving pulses, the horizontal drive pulse
is converted by this board so that it can drive the CCD
directly. The CCD unit is mounted on the BI-199/200/201
board to which the horizontal and vertical drive pulses and
the control voltage are applied to the CCD. The output
signal from the CCD is supplied by the two output signal
lines to which the entire bandwidth of the CCD output
signal is divided into the two signal lines equally. These
output signals are sent to the PA-340 board via source-
followers.
1-64
PA-340 board
The two output signals (the bandwidth is half of the
original Hi-vision signal) from the CCD imager that are
supplied from the BI-199/200/201 board are sent to the
correlation double-sampling circuit (IC100 for R-ch, IC200
for G-ch, and IC300 for B-ch) where the video signal is
taken out. These two outputs are synthesized to the original
bandwidth of the Hi-vision signal by multiplexing them
(IC405 for R-ch, IC505 for G-ch, and IC605 for B-ch). The
output signal is sent to the DCP-43 board.
HDW-F900R/V1 (E)