SM5879AV Datasheet, PDF (16/20 Pages) Nippon Precision Circuits Inc – 3rd-order , 2-channel D/A Converter

SM5879AV
Deemphasis filter
The built-in deemphasis filter in the SM5879AV
operates at fs = 44.1 kHz.
Table 5.
Parallel setting pin name
Microcontroller setting
flag
DEEM
FDEM
H
L
Deemphasis mode
ON
OFF
Soft Mute
With parallel setting (when P/M is HIGH), soft mute
can be activated by the MUTE pin level setting using
the built-in attenuation counter. When muting is acti-
vated, MUTE is HIGH.
When soft mute is activated, the attenuation counter
operates and lowers gain in 128 steps.
The time until mute is activated is approximately
1024/fs ≈ 23.2 msec. The time required to release
muting is the same.
MUTE
0dB
(Gain)
−∞
1024/fs
1024/fs
Figure 6. Example of soft mute operation
NIPPON PRECISION CIRCUITS—16