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BA7657F_ View Datasheet(PDF) - ROHM Semiconductor

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BA7657F_ Datasheet PDF : 13 Pages
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Multimedia ICs
BA7657F / BA7657S
Procedure for measurement of frequency characteristics and crosstalk characteristics
(1) Frequency characteristics
230MHz) to IN1.
Use an oscillator to input a sine wave (VIN = 1.0VP-P, f =
Connect IN2 to the ground through a capacitor.
1MHz / 230MHz) to the color signal pins.
Set the switch to 2, input to IN2, then measure.
To select R1, G1 and B1: Set the switch to 1.
CTI2 = 20log (VOUT / VIN) [dB]
To select R2, G2 and B2: Set the switch to 2.
(5) Block crosstalk 1
Gf1 = Gv (f = 1MHz) – Gv (230MHz) [dB]
Use an oscillator to input a sine wave (VIN = 1.0VP-P, f =
(2) Frequency characteristic deviation
10MHz) to G1 and B1.
Use an oscillator to input a sine wave (VIN = 1.0VP-P, f =
Connect R1 to the ground through a capacitor.
1MHz / 100MHz) to the color signal pins.
Set the switch to 1 and measure the R output.
To select R1, G1 and B1: Set the switch to 1.
CTB1R = 20log (VOUTR / VING1) [dB]
To select R2, G2 and B2: Set the switch to 2.
Similarly,
Gf1 = Gv (f = 1MHz) – Gv (100MHz) [dB]
CTB1G = 20log (VOUTG / VINB1) [dB]
Gfl = Gf (IN1) – Gf (IN2) [dB]
CTB1B = 20log (VOUTB / VINR1) [dB]
GfB = Gf (R1) – Gf (G1), Gf (G1) – Gf (B1),
(6) Block crosstalk 2
Gf (B1) – Gf (R1) [dB]
Use an oscillator to input a sine wave (VIN = 1.0VP-P, f =
(3) Input pin crosstalk (1)
230MHz) to G1 and B1.
Use an oscillator to input a sine wave (VIN = 1.0VP-P, f =
Connect R1 to the ground through a capacitor.
10MHz) to IN1.
Set the switch to 1 and measure the R output.
Use a capacitor to connect IN2 to GND. Set the switch
CTB2R = 20log (VOUTR / VING1) [dB]
to 2, then select output IN2 and measure.
Similarly,
CTI1 = 20log (VOUT / VIN) [dB]
CTB2G = 20log (VOUTG / VINB1) [dB]
(4) Input pin crosstalk 2
CTB2B = 20log (VOUTB / VINR1) [dB]
Use an oscillator to input a sine wave (VIN = 1.0VP-P, f =
Circuit operation
(1) Analog switches
Used for switching between the two sets of RGB color
signals. Connect the high voltage to CTL to select IN1,
or the low voltage to select IN2.
(2) Digital switches
Used for switching between the two sets of HD / VD
synchronization signals. Connect the high voltage to
CTL to select the HD / VD synchronization signal for
IN1, or the low voltage to select the HD / VD synchro-
nization signal for IN2.
(3) Synchronization separator
Used to output the synchronization signal after separat-
ing it from the composite signal (Sync on Green).
When the HD signal is input it activates the synchro-
nization signal detector, stopping the synchronization
separator. The length of time that the synchronization
separator remains stopped is set according to the con-
stant attached to the detector wave pin of the synchro-
nization detector.
Relationship between inputs and outputs
Input
Output
HD VD Sync on Green HD VD Composite Sync
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