SM5950AM
Asynchronous Sample Rate Converter
OVERVIEW
The SM5950AM is a digital audio signal asynchronous sample rate converter LSI. It supports 16/20/24-bit
word-length input/output interface data. It also features a built-in digital deemphasis filter and direct mute
functions.
FEATURES
Functions
I
I
I
I
PINOUT
(Top view)
I
I
I
I
I
I
I
I
I
I
L/R 2-channel (stereo) processing
Input sample rate range: 20kHz to 100kHz
Output sample rate range: 30kHz to 50kHz
Operating sample rate conversion ratio (fso/fsi)
*1
: 0.45 to 2.205 selectable
*1
: fsi = input sample rate
fso = output sample rate
Asynchronous input and output clock timing
System clock input
• Input system clock: 1fsi (LRCI)
• Output system clock: 512fso (SCKO input)
Deemphasis filter function
• IIR-type filter
• fsi = 44.1kHz, 48kHz, 32kHz compatible
Direct mute function
Through mode operation
• Direct connection from input to output
Output data clocks (LRCO, BCKO)
• Slave mode: external inputs
• Master mode: derived from the output system
clock (SCKO)
Computation round-off processing
• Normal round-off
5V tolerant input pins for direct connection to 5V
operation devices
3.3V single supply
Package: 24-pin SSOP
LRCI
BCKI
DI
TMOD0
RSTN
VDD
IISI
IMOD0
IMOD1
DEEM
FS0
FS1
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
LRCO
BCKO
DOUT
SLAVE
SCKO
VSS
IISO
OMOD0
OMOD1
TMOD1
THROU
DMUTE
PACKAGE DIMENSIONS
(Unit: mm)
Weight: 0.23g
10.20 ± 0.30
10.05 ± 0.20
+
0.15
−
0.10
0.05
5.40 ± 0.20
Device
SM5950AM
Package
24-pin SSOP
1.80
0 to 10
0.10 ± 0.10
0.36 ± 0.10
0.10
0.12
M
Note: Dimensions without tolerance are reference values.
NIPPON PRECISION CIRCUITS INC.—1
+ 0.20
1.90
−
0.10
0.8
0.50 ± 0.20
ORDERING INFORMATION
7.80 ± 0.30
NPC [ NIPPON PRECISION CIRCUITS INC ]
