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6-4
6-2-2. PLL IC TLC2932 (QX029) for Video Signal
The PLL IC of TLC2932 is composed of a phase
comparator and a VCO. As a frequency dividing circuit is
not built in, so the IC works as a PLL circuit by connect-
ing to the external VCO terminal of QX028 and using the
frequency dividing circuit of QX028.
6-2-3. Sync Process IC SYG (QX004)
A configuration of the SYG component is shown in Fig.
6-2-2. The SYG IC is used as a sync process IC and
composed of the timing generation circuit for 2 systems,
one for the input signal and the other is for the panel
display, and the input signal measurement circuit. The IC
supplies the HD/VD signal to each IC and the IC works
on the timing signal basis. Also, the field identification at
video signal is carried out by the IC. In the unit, as the
PLL circuit is independent from the SYG, the sync signal
(DSYNC) enters from the PLL circuit to pin 139. The pin
is connected to the reset terminal of the horizontal
counter (for input signal).
Fig. 6-2-2
6-2-4. Timing Signal Generation PLD (QX009)
A configuration of timing signal generation PLD is
shown in Fig. 6-2-3. The timing generation PLD gener-
ates the clock pulse and the timing signal to drive the
panel. As the signal timing and clock differ owing to the
inverted driving for top/bottom/left/right of panel and
kinds of input signals, the mode signal controls the
timing signal generation PLD.
Fig. 6-2-3
6-2-5. A/D Converter CXA3026Q
(QX201, QX401 and QX601)
A configuration of CXA3026Q is shown in Fig. 6-2-4.
The max. conversion speed of 120 MHz is supported by
CXA3026Q, A/D converter.
A frequency dividing circuit is built in the A/D converter
and the converter develops the data for two systems. The
clock speed is fast, so that the clock signal to be entered
is a differential input of PECL level. The input level of
analog signal ranges from 2.0 to 4.0V.
MPU
SIGNAL FORMAT
MEASUREMENT
TIMING SIGNAL
GENERATOR 1
TIMING SIGNAL
GENERATOR 2
BUS
INTERFACE
32.5 MHz
HD, VD
PLL IC
QX008
PLL
CIRCUIT
SW
MODE
DECODER
PANEL TIMING
GENERATOR
Timing signals
for
LCD panel
PCLK
AD CLK/2
32.5 MHz
Mode
CLK, HD, VD