BA7658 Ver la hoja de datos (PDF) - ROHM Semiconductor

Número de pieza

componentes Descripción

Fabricante

BA7658

Input selector switch for high definition displays

ROHM Semiconductor 

Multimedia ICs

•Procedure for measurement of frequency character-

istics and crosstalk characteristics

(1) Frequency characteristics 1

Use an oscilloscope to input a sine wave (VIN = 1.0VP-P,

f = 1MHz / 150MHz) to the color signal input pins. Set

the switch to 1 to select B1, G1 and R1, or to 2 to

select B2, G2 and R2.

Gf1 = Gv (f = 1MHz) – Gv (150MHz) [dB]

(2) Frequency characteristic 2

Use an oscilloscope to input a sine wave (VIN = 1.0VP-P,

f = 1MHz / 230MHz) to the color signal input pins. Set

the switch to 1 to select B1, G1 and R1, or to 2 to

select B2, G2 and R2.

Gf1 = Gv (f = 1MHz) – Gv (250MHz) [dB]

(3) Input pin crosstalk 1

Use an oscilloscope to input a sine wave (VIN = 1.0VP-P,

f = 10MHz) to IN1. Connect IN2 to the ground through

a capacitor. Set the switch to 2, input to IN2, then mea-

sure.

CTI1 = 20log (VOUT / VIN) [dB]

(4) Input pin crosstalk 2

Use an oscillator to input a sine wave (VIN = 1.0VP-P, f =

230MHz) to IN1. Connect IN2 to the ground through a

BA7658AFS

capacitor. Set the switch to 2, input to IN2, then mea-

sure.

CTI2 = 20log (VOUT / VIN) [dB]

(5) Block crosstalk 1

Use an oscillator to input a sine wave (VIN = 1.0VP-P, f =

10MHz) to G1 and R1. Connect B1 to the ground

through a capacitor. Set the switch to 1 and measure

the B output.

CTB1B = 20log (VOUTB / VING1) [dB]

Similarly,

CTB1G = 20log (VOUTG / VINR1) [dB]

CTB1R = 20log (VOUTR / VINB1) [dB]

(6) Block crosstalk 2

Use an oscillator to input a sine wave (VIN = 1.0VP-P, f =

230MHz) to G1 and R1. Connect B1 to the ground

through a capacitor. Set the switch to 1 and measure

the B output.

CTB2B = 20log (VOUTB / VING1) [dB]

Similarly,

CTB2G = 20log (VOUTG / VINR1) [dB]

CTB2R = 20log (VOUTR / VINB1) [dB]

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