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SM5956A Datasheet

  • SM5956A

  • Nippon Precision Circuits Inc [6-channel Asynchronous Sampl...

  • NPC

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SM5956A
6-channel Asynchronous Sample Rate Converter
OVERVIEW
The SM5956A is a digital audio signal, asynchronous sample rate converter LSI. It reads 6-channel 16/20/24-
bit word length input data, and 16/20/24-bit word length output data. It also features a built-in digital deempha-
sis 鏗乴ter, direct muting and digital audio interface output.
FEATURES
Functions
I
PINOUT
(Top view)
OMOD0
OMOD1
OWL0
OWL1
BCKO
LRCO
DITO
26
I
I
I
I
I
I
I
I
I
I
I
I
I
I
L/R 6-channel processing
(2-channel stereo, 3-system processing)
Input sample rate range: 10kHz to 200kHz
Output sample rate range: 30kHz to 50kHz
Operating sample rate conversion ratio (fso/fsi)
*1
鈥?0.45 to 4.41 (SCKSLN = L, 512fso operation)
鈥?0.225 to 4.41 (SCKSLN = H, 768fso operation)
*1
: fsi = input sample rate
fso = output sample rate
Asynchronous input timing and output timing
clock inputs
System clock input
鈥?Input system clock: 1fsi (LRCI)
鈥?Output-system clock: 512fso/768fso
(input on SCK)
Deemphasis 鏗乴ter function
鈥?IIR 鏗乴ter structure
鈥?44.1kHz, 48kHz, 32kHz input sample rate fsi
compatible
Direct mute function
Through mode
鈥?Input data passed directly to the outputs
Digital audio interface output
鈥?DIA input data undergoes sample rate conver-
sion and is output biphase mark encoded
Output data clocks (LRCO, BCKO)
鈥?LRCO rate: 1fso
鈥?BCKO rate: 64fso (SCKSLN = L, 512fso operation)
48fso (SCKSLN = H, 768fso operation)
鈥?Slave mode: Data is output at a rate dictated by
an externally input signal
鈥?Master mode: Sample rate is generated internally
from the output-system clock, and
supplied as an output
MCU interface
鈥?3-wire serial interface
5V tolerant inputs for direct connection to 5V
devices
3.3V single supply
Package: 48-pin QFP
DOC
DOA
DOB
36
35
34
33
32
31
30
29
28
27
25
VDD
VSS
VDD
TEST0
TEST1
TEST2
TEST3
SCK
VSS
SCKSLN
ERROR
RSTN
SELFN
VSS
37
38
39
40
41
42
43
44
45
46
47
48
24
23
22
21
20
19
18
17
16
15
14
13
VSS
OEDITON
SLAVEN
THROUN
DMUTEN
MLE
MDT
MCK
FS1
FS0
DEEMN
VDD
IMOD1
10
TEST4
11
PACKAGE DIMENSIONS
(Unit: mm)
9 鹵 0.4
7 鹵 0.1
+ 0.075
0.125
鈭?/div>
0.025
7 鹵 0.1
9 鹵 0.4
IMOD0
IWL0
BCKI
IWL1
LRCI
VDD
VSS
12
1
2
3
4
5
6
7
8
DIA
DIB
DIC
9
1.4 鹵 0.1
1.7 MAX
0 ~ 10
+ 0.09
0.18
鈭?/div>
0.05
Note. Dimensions without tolerance are reference values.
ORDERING INFORMATION
Device
SM5956AF
Package
48-pin QFP
0.1
0.5
0.08
SEIKO NPC CORPORATION 鈥?
0.5 鹵 0.2

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