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SM5849 Datasheet(PDF) 16 Page - Nippon Precision Circuits Inc

Part # SM5849
Description  Asynchronous Sample Rate Converter
PDF  26 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

SM5849 Datasheet(HTML) 16 Page - Nippon Precision Circuits Inc

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SM5849AF
NIPPON PRECISION CIRCUITS—16
Deemphasis (DEEM, FSI1, FSI2 pins or FDEEM, FFSI1, FFSI2 flags)
The digital deemphasis filter is an IIR filter with vari-
able coefficients to faithfully reproduce the gain and
phase characteristics of analog deemphasis filters.
The filter coefficients are selected by FSI1 (or FFSI1
flag) and FSI2 (or FFSI2 flag) to correspond to the
sampling frequencies fs = 44.1, 48.0 and 32.0kHz.
Table 3. Mode flag description
D 1
Bit
Mode flag
Mode function select
Reset
mode
P arameter
L O W/HIGH
Select
HIGH
D2 to D7
(Not used)
Test mode select
IC test mode fla g s.
Not used for normal operation.
D2 to D7 should be set LOW .
LO W
D 8
F R AT E
Input/output rate
HIGH
Set the input/output sample rate ratio for each
output sample
LO W
LO W
Set the input/output sample rate ratio with high
accuracy every 2048 output samples
D 9
F12DB
Attenuator
HIGH
+12dB gain shift
LO W
L O W
No gain shift (normal operation)
D 1 0
FFSI1
Deemphasis fi lter fs
select 1
fsi select
LO W
D 1 1
FFSI2
Deemphasis fi lter fs
select 2
LO W
D 1 2
FDEEM
Deemphasis control
ON/OFF
HIGH
Deemphasis fi lter ON
LO W
L O W
Deemphasis fi lter OFF
FFSI2
FFSI1
fsi
LO W
L O W
44.1kHz
L O W
HIGH
HIGH
L O W
48.0kHz
HIGH
HIGH
32.0kHz
Table 4. Deemphasis ON/OFF
DEEM
(MCOM = LOW )
FDEEM
(MCOM = HIGH)
Deemphasis
HIGH
O N
LO W
OFF
Table 5. Deemphasis fs select (FSI1, FSI2 pins or
FFSI1, FFSI2 flags)
MCOM = LOW (MCOM = HIGH)
fs
FSI1 (FFSI1)
FSI2 (FFSI2)
LO W
L O W
44.1kHz
HIGH
L O W
L O W
HIGH
48.0kHz
HIGH
HIGH
32.0kHz



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