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SM5847AF Datasheet(PDF) 15 Page - Nippon Precision Circuits Inc

Part # SM5847AF
Description  High-fidelity Digital Audio, Multi-function Digital Filter
PDF  30 Pages
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Manufacturer  NPC [Nippon Precision Circuits Inc]
Direct Link  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM5847AF Datasheet(HTML) 15 Page - Nippon Precision Circuits Inc

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SM5847AF
NIPPON PRECISION CIRCUITS—15
Digital Deemphasis (DEMPL, DEMPR, FSEL1, FSEL2)
Most deemphasis filters are constructed using analog
circuit techniques. Here, an IIR filter is employed to
faithfully reproduce the gain and phase characteris-
tics of standard analog deemphasis filters, corre-
sponding
to
analog
50µs/15µs
frequency
characteristics. Three sets of filter coefficients for the
three fs = 32/44.1/48 kHz sampling frequencies are
supported. Deemphasis for other values of fs are not
supported.
Deemphasis ON/OFF (DEMPL, DEMPR)
Deemphasis for the left and right-channel can be
controlled independently.
Filter coefficient select (FSEL1, FSEL2)
Soft Muting (MUTEL, MUTER)
The muting function controls the muting of left and
right-channel independently. Input data continues to
be accepted even when mute is operating.
Mute ON/OFF
When MUTEL (MUTER) goes HIGH, the attenua-
tion changes smoothly from 0 to
−∞ dB. Similarly,
when MUTEL (MUTER) goes LOW, muting is
released and the attenuation changes smoothly from
−∞ to 0 dB. This operation is termed soft muting.
Soft muting takes an interval of approximately
512/fs, or about 11.6 ms when fs = 44.1 kHz.
Mute operation at reset
When RSTN goes LOW, the DOL and DOR outputs
are immediately muted to
−∞ dB. When RSTN goes
HIGH, reset is released and the outputs are immedi-
ately set to 0 dB attenuation.
Note that even when either MUTEL or MUTER or
both are HIGH, the reset operation takes precedence.
Table 1. Deemphasis control
DEMPL
DEMPR
Deemphasis
LO W
×
Left-channel OFF
HIGH
×
Left-channel ON
×
L O W
Right-channel OFF
×
HIGH
Right-channel ON
Table 2. Deemphasis filter coefficient select
FSEL1
FSEL2
Sampling frequency (fs)
L O W
L O W
44.1 kHz
L O W
HIGH
48 kHz
HIGH
L O W
Prohibited mode
HIGH
HIGH
32 kHz
Table 3. Mute control
MUTEL
MUTER
Soft muting
LO W
×
Left-channel OFF
HIGH
×
Left-channel ON
×
L O W
Right-channel OFF
×
HIGH
Right-channel ON



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