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TA2170FTG Folha de dados(PDF) 5 Page - Toshiba Semiconductor |
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5 / 12 page TA2170FTG 2006-04-19 5 Application Notes 1. Mute switch and voltage gain This IC is designed so that a volume feeling may not change with a single output and many outputs. When the input signal to buffer amplifier is same and a linear domain, the relation between mute switches and voltage gain are as follows. Test condition: VCC = 3 V, f = 1 kHz, Vin = −20dBV, theoretical value (1) 1 input mode Attenuation to an input signal (dB) MUTE SW BUF1 BUF2 BUF3 Total gain (dB) MUTE1 MUTE1A MUTE2 MUTE3 Ach Bch Ach Bch Ach Bch Ach Bch Input signal is applied to BUF 1. OFF OFF ON ON 0 0 ⎯ ⎯ ⎯ ⎯ 0 0 OFF OFF OFF ON −6 −6 ⎯ ⎯ ⎯ ⎯ −6 −6 OFF OFF ON OFF −6 −6 ⎯ ⎯ ⎯ ⎯ −6 −6 OFF OFF OFF OFF −9.5 −9.5 ⎯ ⎯ ⎯ ⎯ −9.5 −9.5 OFF ON ON ON ⎯ 0 ⎯ ⎯ ⎯ ⎯ ⎯ 0 OFF ON OFF ON ⎯ −6 ⎯ ⎯ ⎯ ⎯ ⎯ −6 OFF ON ON OFF ⎯ −6 ⎯ ⎯ ⎯ ⎯ ⎯ −6 OFF ON OFF OFF ⎯ −9.5 ⎯ ⎯ ⎯ ⎯ ⎯ −9.5 Input signal is applied to BUF 2 ON ON/OFF OFF ON ⎯ ⎯ 0 0 ⎯ ⎯ 0 0 ON ON/OFF OFF OFF ⎯ ⎯ −6 −6 ⎯ ⎯ −6 −6 OFF OFF OFF ON ⎯ ⎯ −6 −6 ⎯ ⎯ −6 −6 OFF ON OFF ON ⎯ ⎯ 0 −6 ⎯ ⎯ 0 −6 OFF OFF OFF OFF ⎯ ⎯ −9.5 −9.5 ⎯ ⎯ −9.5 −9.5 OFF ON OFF OFF ⎯ ⎯ −6 −9.5 ⎯ ⎯ −6 −9.5 Input signal is applied to BUF 3. ON ON/OFF ON OFF ⎯ ⎯ ⎯ ⎯ 0 0 0 0 ON ON/OFF OFF OFF ⎯ ⎯ ⎯ ⎯ −6 −6 −6 −6 OFF OFF ON OFF ⎯ ⎯ ⎯ ⎯ −6 −6 −6 −6 OFF ON ON OFF ⎯ ⎯ ⎯ ⎯ 0 −6 0 −6 OFF OFF OFF OFF ⎯ ⎯ ⎯ ⎯ −9.5 −9.5 −9.5 −9.5 OFF ON OFF OFF ⎯ ⎯ ⎯ ⎯ −6 −9.5 −6 −9.5 |
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