MN35502 Datasheet, PDF (5/8 Pages) Panasonic Semiconductor – D/A Converter for Digital Audio Equipment

For Audio Equipment
MN35502
Functional Descriptions
Digital attenuation and reset
Table 2 shows how the inputs from the two pins RSBUP and RSBDN control digital attenuation.
Table 2. Attenuation Modes
Pin Name
RSBUP
RSBDN
Pin States and Operating Modes
L
↑↓
L
↑
H
L
L
↑
H
↑
Mode
Reset
Mute
Normal
Attenuation control
Volume
Mute (–∞)
0dB
UP
DOWN
Notes
1: The upward arrow indicates the rising edge change of the input signal; the paired arrows, the rising and falling edge changes.
2: Always reset the chip after applying the power, restarting the clock, or changing the clock speed. (Wait for the crystal
oscillation to stabilize and then apply a reset signal at least eight LRCK clock cycles long.)
3: Digital attenuation is not available for modes with a master clock of 512 f_s (modes 60 to 70).
There are a total of 32 attenuation levels.
According to the attenuation control shown in Table-2, volume goes up or down in one step every input-signal
rising-edge. Still, in the 0 dB state, up-pulse does not change the volume. Similary, in the muting state (–∞), down-
pulse does not change the volume.
The change of the input signals is detected by inner clock of 32 f_s period, so always use a frequency of 16 f_s or less
for changes in the RSBUP and RSBDN signals.
Do not simultaneously change the RSBUP and RSBDN signals unless setting up for a reset.