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Sharp SM-SX1 Service Manual page 39

1-bit amplifier
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IC801 VHiSM5844AF-1: Sampling Rate Converter (SM5844AF) (1/2)
• Outline
SM5844AF is a special LSI for sampling rate converter, having a function to asynchronously covert the sample rate of the digital
audio signal. The input/output interface correspond to the input data of 16/20-bit word length and the output data of 16/18/20-bit
word length. Moreover, it integrates the digital de-emphasis filter, digital attenuator and other functions.
The package is a 44-pin QFP type, and the LSI is excellent in the cost performance.
Pin No.
Port Name
1, 2
DI
Input with pull-up resistor
3, 4
BCKI
Input with pull-up resistor
5
LRCI
Input with pull-up resistor
6
ICLK
7
ICKSL
Input with pull-up resistor
8*, 9*
IFM1
Input with pull-up resistor
10, 11
IFM2
Input with pull-up resistor
12, 13
VDD
14, 15
DMUTE
Input with pull-up resistor
16
MCOM
Input with pull-up resistor
17
MDT/FSI1
Input with pull-up resistor
18
MCK/FSI2
Input with pull-up resistor
19, 20
MLEN/DEEM
Input with pull-up resistor
21, 22
OW18N
Input with pull-up resistor
23, 24
OW20N
Input with pull-up resistor
25, 26
IISN
Input with pull-up resistor
27*
STATE
28*
TST1N
Input with pull-up resistor
29*
TST2N
Input with pull-up resistor
30, 31
RSTN
Input with pull-up resistor
32, 33
VSS
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
Input/Output
Input data
Bit clock on the input side
Word clock on the input side
Input
System clock input on the input side
System clock on the input side (ICLK) selection. H:384fsi, L: 256fsi
Input format setting at IFM1 and IFM2
IFM1
Terminal
Power supply terminal (5V)
(Direct) mute
Function switch of 17 to 20 pins
In case of MCOM=H, Microcomputer data input: MDT
In case of MCOM=L, De-emphasis frequency setting: FSI1
In case of MCOM=H, Bit-clock for microcomputer data input: MCK
In case of MCOM=L, De-emphasis frequency setting :FSI2
Input sample frequency setting (for de-emphasis)
In case of MCOM=H, Microcomputer data word latch clock: MLEN
In case of MCOM=L, De-emphasis ON/OFF control: DEEM
Output format setting with OW18N, OW20N
Time of IISN=H (normal mode)
Time of IISN=L (IIS mode)
IIS output mode selection. H: Normal mode, L: IIS mode
Output
Output to express the internal operational state (for operation check)
Control of output dither. H: Dither OFF, L: Dither ON
Test terminal. Set at H.
Reset terminal
GND terminal (0V)
IFM2
Word
Terminal
Length
L
L
16 Bit
L
H
H
L
20 Bit
H
H
FSI
FSI1
32.0 kHz
H
44.1 kHz
X
48.0 kHz
L
Output Format
16 Bit
18 Bit
Backward packing
20 Bit
Forward packing
Output Format
16 Bit
18 Bit
IIS Mode
Forward packing
20 Bit
– 39 –
SM-SX1/SX1W
Function
Data Sequence
Data Position
Backward packing
MSB first
Forward packing
LSB first
Backward packing
FSI2
H
L
H
OW20N
H
H
L
L
OW20N
H
H
L
L
OW18N
H
L
H
L
OW18N
H
L
H
L

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Sm-sx1w