YSS906 データシートの表示（PDF） - Yamaha Corporation

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YSS906

ASR2P Analog Surround

Yamaha Corporation 

YSS906

4. Enabling/disabling functions through SW(11)

This LSI uses the built-in seven comparators to determine the voltage created by the combined resistance of 50

kW, 100 kW and 200 kW resistors, and enables or disables the functions based on the result of the comparison.

The following table presents the voltages determined by the comparators and functions enabled or disabled by

the voltages.

Resistors, and pins to be connected to

50kW 100kW 200kW

VDD VDD VDD

VDD VDD VSS

VDD VSS VDD

VDD VSS VSS

VSS VDD VDD

VSS VDD VSS

VSS VSS VDD

VSS VSS VSS

Voltage at

SW pin

VDD

6/7 VDD

5/7 VDD

4/7 VDD

3/7 VDD

2/7 VDD

1/7 VDD

VSS

Pseudo

-stereo

ON

ON

ON

ON

OFF

OFF

OFF

OFF

Wide

Surround

ON

ON

OFF

OFF

ON

ON

OFF

OFF

Tone

control

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON: Enabled

OFF:Disabled

Be sure to connect the recommended 50 kW, 100 kW and 200 kW resistors to VDD or VSS according to the

combination of the functions to be used, and apply an appropriate voltage to SW(11) pin accordingly by referring

to the above table. (The combination of the functions to be used cannot be selected normally if any of the

resistors is left unconnected. Connect every resistor as specified by the table even if one or more of the functions

is not used.) The switch for selecting a voltage on SW pin must be operated so that the specified voltage can be

attained within 30 msec.

5. Inputting monaural signals

When obtaining the pseudo-stereophonic effect by inputting monaural signals, supply the same signal to AIL and

AIR pins, and connect 50 kW resistor to VDD so that the pseudo-stereo function is enabled.

6. Current

This LSI takes current of 15 mA when VDD = 5 V.Since current generally changes in proportion to voltage, the

current becomes 9 mA when this LSI is used with VDD = 3 V.

*Note:

Enabling pseudo-stereo, Wide Surround and/or Tone Control functions increases the gain of internal circuit so

that the output signal are clipped easily. Therefore, the level of the input signal should be determined properly to

avoid the clipping of the signal.The rise of the gain of the internal circuit should increase the level of outputted

noise so that apparent S/N ratio is reduced. This phenomena is not abnormal.

(The S/N ratio becomes approximately 82 dB when the pseudo-stereo is enabled, Wide Surround is set to 50 %,

and tone control is +3 dB for treble and +6 dB for bass.)

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