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SM5844 Fiches technique(PDF) 14 Page - Nippon Precision Circuits Inc

No de pièce SM5844
Description  Asynchronous Sample Rate Converter
PDF  26 Pages
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Fabricant  NPC [Nippon Precision Circuits Inc]
Site Internet  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM5844 Fiches technique(HTML) 14 Page - Nippon Precision Circuits Inc

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SM5844AF
NIPPON PRECISION CIRCUITS—14
Deemphasis (DEEM, FSI1, FSI2 pins or FDEEM, FFSI1, FFSI2 flags)
The digital deemphasis filter is an IIR filter with var-
iable coefficients to faithfully reproduce the gain and
phase characteristics of standard 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 32.0 kHz.
Table 2. Mode flag description
B 1
Bit
Mode flag
Mode function select
Reset
mode
P arameter
L O W/HIGH
Select
HIGH
B2 to B5
Not used
B6
FTST1
Test mode select 1
TST2N = LOW
LO W
B7
FTST2
Test mode select 2
LO W
B 8
F R AT E
Input/output rate
LO W
Input/output sample rate ratio check after every
output
LO W
HIGH
Input/output sample rate ratio check for high
accuracy after every 2048 outputs
B9
F12DB
Attenuator
L O W
N o r mal operation (no shift)
LO W
HIGH
+12 dB gain shift
B 1 0
FFSI1
Deemphasis fi lter fs
select 1
LO W
B 1 1
FFSI2
Deemphasis fi lter fs
select 2
LO W
B 1 2
FDEEM
Deemphasis control
ON/OFF
L O W
Deemphasis fi lter OFF
LO W
HIGH
Deemphasis fi lter ON
FTST2
FTST1
Mode
LO W
L O W
0
L O W
HIGH
1
HIGH
L O W
2
HIGH
HIGH
3
FFSI2
FFSI1
fsi
LO W
L O W
44.1 kHz
L O W
HIGH
HIGH
L O W
48.0 kHz
HIGH
HIGH
32.0 kHz
Table 3. Deemphasis ON/OFF
When MCOM = LOW
When MCOM = HIGH
Deemphasis
DEEM = HIGH
FDEEM = HIGH
O N
DEEM = LOW
FDEEM = LOW
O F F
Table 4. Deemphasis fs select (FSI1, FSI2 pins or
FFSI1, FFSI2 flags)
MCOM = LOW (MCOM = HIGH)
fs
FSI1 (FFSI1)
FSI2 (FFSI2)
LO W
L O W
44.1 kHz
HIGH
L O W
L O W
HIGH
48.0 kHz
HIGH
HIGH
32.0 kHz



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