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BA7795FS Datasheet(PDF) 10 Page - Rohm |
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BA7795FS Datasheet(HTML) 10 Page - Rohm |
10 / 12 page 10 Video ICs BA7795LS / BA7795FS •Operation notes (1) ALC level Set the ALC level in the range – 8dBV to 0dBV by selecting the values of resistors R1 and R2 connected between BIAS, ALC LEVEL and GND. The formula for approximating the value of this resistor is as follows: If the ALC level setting is too low, level variation will increase compared to that of the standerd level (VOA = – 6dBV), and conversely, if the level is too high, the level variation will decrease, but distortion will increase.There is almost no temperature characteristic, but the ALC level does vary with supply voltage (VCC) as shown in the formula above. Use care when setting it. (2) Mute signal Apply the mute signal shown below at power on and off. If the muting time is short, a pop sound will be audi- ble, particularly when the power is switched on. Also, be certain to apply the mute signal when switch- ing between PB / LINE / TU. In the case of LINE / TU switching, it is possible to suppress switching noise by applying a time constant to the signal, in which case it is not necessary to apply the mute signal. (3) Recording control Do not switch the PB and REC modes on togther. This will cause faulty operation. (4) Line output The line output can drive a load resistance of up to 2k Ω. Depending on the type of load, it can cause local oscillation (eg. large capacitive loads that draw large current), so caution is required. In particular, when there is a possibility that the line output will be connect- ed to a shielded cable, or line cable, connect a resistor of about 1k Ω in series with the output so that the capacitive load is not directly coupled to the IC output terminal. 2sec or more (H) VCC MUTE CTRL LINE OUT (H) Fig. 7 2 VCC – 0.7 R1 R1 + R2 • VBIAS VOA = = • • 1 R1 R1 + R2 2 1 2 • 2 VCC – 0.7 R1 R1 + R2 VBIAS VBIAS = BIAS ALC LEVEL Fig. 6 |
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