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PDF BA7657S Data sheet ( Hoja de datos )
| Número de pieza | BA7657S | |
| Descripción | Input selector switch for high definition displays | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Multimedia ICs
Input selector switch for high
definition displays
BA7657F / BA7657S
The BA7657F and BA7657S are for high definition displays, and have internal switches for switching between broad-
band RGB signals and HD / VD signals, as well as an internal synchronization separator. These ICs simplify the de-
signing of input units for deluxe displays.
•Applications
CRT display, HDTV, video board for personal computer, etc.
•Features
1) Operates on a single 5V power supply.
2) Internal broadband RGB switch (frequency charac-
teristics: 230MHz, – 3dB).
3) Internal HD / VD switch.
4) Internal synchronization separator for synchronizing
signals superimposed onto G signals.
•Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Limits
Unit
Power supply voltage
Power
dissipation
BA7657F
BA7657S
VCC
Pd
8.0
550∗
1200∗
V
mW
Operating temperature
Topr
– 25 ~ + 75
°C
Storage temperature
Tstg – 55 ~ + 125 °C
∗ Reduced by 5.5mW (BA7657F) or 12mW (BA7657S) for each increase in Ta of 1°C over 25°C.
•Recommended operating conditions (Ta = 25°C)
Parameter
Symbol Min. Typ.
Power supply voltage
VCC 4.5 5.0
Max.
5.5
Unit
V
1
1 page  
Multimedia ICs
BA7657F / BA7657S
•Electrical characteristics (unless otherwise noted, Ta = 25°C, VCC = 5.0V)
Parameter
Quiescent current
〈Analog switch unit〉
Maximum output level
Voltage gain
Input pin voltage gain deviation
Block voltage gain deviation
Input pin crosstalk 1
Block crosstalk 1
〈Digital switch unit〉
Input high level voltage
Input low level voltage
Input high level current
Input low level current
Rise time
Fall time
Rise delay time
Fall delay time
Output high level voltage
Output low level voltage
Output high level current
Output low level current
〈SYNC separation unit〉
Minimum SYNC
separation level
Output high level voltage
Output low level voltage
Output low level current
Rise time
Fall time
Rising delay time
Fall delay time
〈Control unit〉
Output high level voltage
Output low level voltage
Output high level current
Output low level current
Symbol Min. Typ. Max. Unit
ICC 20 35 50 mA
Conditions
Vom
GV
∆GVI
∆GVB
CTI1
CTB1
2.8
– 1.0
– 0.2
– 0.2
—
—
—
– 0.5
0
0
– 50
– 50
—
0
0.2
0.2
– 40
– 40
VP-P f = 1kHz
dB f = 1MHz, VIN = 1VP-P
dB f = 1MHz, VIN = 1VP-P
dB f = 1MHz, VIN = 1VP-P
dB f = 10MHz, VIN = 1VP-P
dB f = 10MHz, VIN = 1VP-P
VIH 1.8 — — V
VIL — — 1.2 V
IIH 80 100 130 µA VIN = 5.0V
IIL – 3 – 1
— µA VIN = 0V
TR — 30 50 ns
TF — 30 50 ns
TRD — 50 80 ns
TFD — 30 50 ns
VOH 3.0 3.7 — V
VOL — 0.2 0.4 V
IOH – 400
—
— µA
IOL 5 — — mA
VSMin.
– 50
—
50 mVP-P
VOH 4.5 5.0 — V
VOL — 0.2 0.5 V
IOL 2 — — mA
TR — 80 130 ns
TF — 30 80 ns
TRD — 100 150 ns
TFD — 100 150 ns
VIH 1.8 — — V
VIL — — 1.2 V
IIH 80 100 130 µA VIN = 5.0V
IIL – 3 – 1
— µA VIN = 0V
Measurement circuit
Fig.1
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Fig.2
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5
5 Page 
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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11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet BA7657S.PDF ] | |
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