TA1304F データシートの表示（PDF） - Toshiba

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TA1304F

TV-SOUND PROCESSOR

Toshiba 

TA1304F/N

l Input attenuation control (Sub address 03 (h) / b2)

When this function is active, Input signals are −5 dB attenuated at input stage of L-ch and R-ch. W-ch signal

isn't attenuated. So, W-ch output level is up to 8 dB from L-ch and R-ch outputs relatively.

Set the bit to 0 (b), attenuation is inactive, set the bit to 1 (b), attenuation is active.

Switch on default data is 0 (b).

l ALS switch (Sub address 03 (h) / b6), ALS start point (Sub address 03 (h) / b5~b4)

When bass boost function (addition woofer ch signal to main ch signals) is active, output signals are distort

when the signals are over the dynamic range of the circuits. ALS (Automatic Level Suppressor) suppresses

W-ch signal level under ALS strat point, reduces the distortion in large signals input condition.

Set the bit (Sub address 03 (h) / b6) to 0 (b), ALS is inactive. Set the bit to 1 (b), ALS is active.

Switch on default data is 0 (b).

The bits of 03 (h) / b5~b4 set ALS start point. Set the bits to 00 (b), ALS start point is 180 mVrms. Set the

bits to 01 (b), ALS start point is 310 mVrms. Set the bits to 10 (b), ALS start point is 430 mVrms. And set the

bits to 11 (b), ALS start point is 630 mVrms.

Switch on default data is 00 (b).

l Test switch (Sub address 03 (h) / b7)

This bit is for IC testing. So this bit must be set to 0 (b).

Switch on default data is 0 (b).

l Port 3 control (Sub address 06 (h) / b3), Port 4 control (Sub address 06 (h) / b5~b4)

The IC, e.g. sound demltiplexer, which isn’t avarailable I2C Bus, can be controlled by I2C Bus through

TA1304F.

Port 3 is open-collector type output. Set the bit to 0 (b), port3 is on. Set the bit to 1 (b), port3 is off.

Switch on default data 0 (b).

Port 4 is emitter-follower type output. It can output 3 levels. Set the bits to 00 (b) or 10 (b), port 4 outputs 0

V. Set to 01 (b), port 4 outputs 2.5 V. Set to 11 (b), port 4 outputs 5 V.

Switch on default data is 00 (h).

l Mute 1 (Sub address 07 (h) / b0), Mute 2 (Sub address 07 (h) / b1)

When Mute 1 is active, all outputs are muted. Set the bit to 0 (b), Mute 1 is inactive. Set the bit to 1 (b),

Mute 1 is active.

Switch on default data is 0 (b).

When Mute 2 is active, only W-ch output is muted. Set the bit to 0 (b), Mute 2 is inactive. Set the bit to 1 (b),

Mute 2 is active.

Switch on default data is 0 (b).

2001-02-16 10/31

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