YDA136 Datasheet, PDF (17/32 Pages) YAMAHA CORPORATION – D- 60 STEREO 60W-100W DIGITAL AUDIO POWER AMPLIFIER CONTROLLER

YDA136
●Over Sampling Filter
Be sure to set up the Over Sampling mode according to a sampling frequency (Fs) of audio signals to input.
Over sampling filter mode can be set up by FS1 and FS0 in the control register.
In addition, an over sampling filter can be bypassed by the setting of control register OSF.
When Fs is 32kHz, 44.1kHz or 48kHz
：Sets up to the 4x mode.
When Fs is 64kHz, 88.2kHz, or 96kHz
：Sets up to the 2x mode.
When Fs is 176.4kHz or 192kHz
：Sets up to the 1x mode.
When it is set as Auto mode, the above mentioned over sampling modes are set up by detecting a sampling frequency (Fs)
of audio signal which was input.
■Volume Function
YDA136 has the electronic volume which can be set up in the range from +6dB to -73dB by 1dB step.
By inputting an analog signal from AIL (AIR) terminal, and attenuating with the set up volume value, this electronic
volume outputs a differential analog signal from an OPL (OPR) terminal and OML (OMR) terminal.
Non-inverted signal from OPL (OPR) terminal and inverted signal from OML (OMR) terminal is output.
The maximum input level is 1Vrms and the maximum output level is 1Vrms.
Be sure to set a volume value to a volume register through a MPU serial data interface.
Moreover, in order to suppress the noise at the time of volume value change, a mode (Zero-cross mode) which changes a
volume value when an output signal carries out a zero-cross, is provided as an option.
●Volume Register
D [13:7] of a volume register shows the volume value of R channels, and D [6:0] shows the volume value of L channels.
"1111111" and from "0101110" to "0000000" becomes mute among each volume value.
At this time, a DAC output signal turns into a non-signal irrespective of an input.
●Zero-cross Mode
This is the volume change mode, which reduces the noise generated at the time of change of the volume value of electronic
volume.
When this mode is selected, the volume value is changed under the following conditions.
・ At the time of an audio signal carries out a Zero-cross
・ After the volume change is set up
・ After the volume value setting time (T_ZEROWAIT)
When not selected, the volume is changed regardless of the input after the volume setting.
By ZERO of a control register, Zero-cross mode can be set.
17