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PDF SM5849F Data sheet ( Hoja de datos )
| Número de pieza | SM5849F | |
| Descripción | Asynchronous Sample Rate Converter | |
| Fabricantes | Nippon Precision Circuits Inc | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SM5849F (archivo pdf) en la parte inferior de esta página. Total 26 Páginas | ||
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NIPPON PRECISION CIRCUITS INC.
SM5849AF
Asynchronous Sample Rate Converter
OVERVIEW
The SM5849AF is a digital audio signal, asynchronous sample rate converter LSI. It supports 16/20/24-bit
word length input data, 16/20/24-bit word length output data, 2kHz to 100kHz input sample rate range, and
4kHz to 200kHz output sample rate range. It also features a built-in digital deemphasis filter and digital attenu-
ator.
FEATURES
Functions
s Left/right-channel processing (stereo)
s 2 to 100kHz input sample rate range (fsi)
s 4 to 200kHz output sample rate range (fso)
s 0.45 to 2.2-times variable sample rate conversion
ratio (fso/fsi)
s Asynchronous input and output timing (clock
inputs)
s System clock inputs (input and output clocks inde-
pendent)
• 256fsi or 384fsi input system clock select
• 256fso or 384fso output system clock select
s Deemphasis filter
• IIR-type filter
• 44.1, 48 or 32kHz
s Digital attenuator
• 11-bit data, 1025 levels
• Smooth attenuation change
• +12dB gain shift function
s Direct mute function
s Through mode operation
• Direct connection from input to output
s Output data clocks (LRCO, BCKO)
• Slave mode: external input
• Master mode: output system clock generated
internally
s Dither round-off processing
• Dither round-off ON/OFF selectable
s 3.3V single supply
s 80-pin QFP
s Silicon-gate CMOS process
Filter Characteristics and Converter Efficiency
s 24-bit internal data word length
s Deemphasis filter characteristics (IIR filter)
• ±0.03dB gain deviation from ideal filter charac-
teristics
s Anti-aliasing LPF characteristics
• Output/input sample rate conversion ratio auto-
matic filter select (6 FIR filters)
- Up converter LPF
1.0 to 2.2 times
- Down converter LPF I
0.92 times: 48.0 to 44.1kHz
- Down converter LPF II
0.73 times: 44.1 to 32.0kHz
- Down converter LPF III
0.67 times: 48.0 to 32.0kHz
- Down converter LPF IV
0.5 times: 48.0 to 24.0kHz
- Down converter LPF V
0.45 times: 48.0 to 22.1kHz
• ±0.00005dB passband ripple
• > 110dB stopband attenuation
s Converter noise levels
• ≤ −110dB internal calculation (quantization)
noise
• −98dB (16-bit output), −122dB (20-bit output),
and −146dB (24-bit output) word rounding
noise
s Output S/N ratio (theoretical values)
Output signal
word length
16 bits
20 bits
24 bits
16-bit input
word length
94.8dB
97.7dB
97.7dB
S/N ratio
20-bit input
word length
97.7dB
109.5dB
109.7dB
24-bit input
word length
97.7dB
109.7dB
110dB
NIPPON PRECISION CIRCUITS—1
1 page  
SM5849AF
PIN DESCRIPTION
Number
1
2
3
4
5
6
7
Name
VDD
DI
BCKI
LRCI
VSS
ICLK
ICKSL
I/O1
–
Ip
Ip
Ip
–
I
Ip
8 IFM1 Ip
9 IFM2 Ip
10 IWL1 Ip
11 IWL2 Ip
12 NC –
13 NC –
14 NC –
15 NC –
16 NC –
17 NC –
18 NC –
19 NC –
20 VSS –
21 VDD –
22
DMUTE
Ip
23
MCOM
Ip
24
MDT/FSI1
Ip
25
MCK/FSI2
Ip
26
MLEN/DEEM
Ip
27 NC –
28 NC –
29 NC –
30 NC –
31 NC –
32 NC –
33 NC –
34 NC –
35 NC –
36 NC –
37 NC –
Description
Supply voltage
Digital input signal
Bit clock input
W ord clock input
Ground
System clock input
System clock select. 384fs clock when HIGH, and 256fs clock when LOW .
Input format select
IFM1
LOW
LOW
HIGH
HIGH
IFM2
LOW
HIGH
LOW
HIGH
Data position
Right justified
Right justified1
Left justified
IIS
1. Data is in LSB first sequence
Input word length select
IWL1
LOW
LOW
HIGH
HIGH
IWL2
LOW
HIGH
LOW
HIGH
Data length
16 bits
24 bits
20 bits
24 bits
No connection (must be open)
No connection (must be open)
No connection
No connection (must be open)
No connection (must be open)
No connection (must be open)
No connection (must be open)
No connection (must be open)
Ground
Supply voltage
Direct mute pin. Muting ON when HIGH.
Microcontroller control select. Microcontroller control when HIGH.
When MCON = HIGH: Microcontroller interface data input (MDT)
When MCON = LOW: Deemphasis filter fs select 1 (FSI1)
When MCON = HIGH: Microcontroller interface clock (MCK)
When MCON = LOW: Deemphasis filter fs select 2 (FSI2)
When MCOM is HIGH: Microcontroller interface latch enable (MLEN)
When MCOM is LOW: Deemphasis function select (DEEM)
No connection (must be open)
No connection (must be open)
No connection (must be open)
No connection (must be open)
No connection (must be open)
No connection (must be open)
No connection (must be open)
No connection (must be open)
No connection (must be open)
No connection (must be open)
No connection (must be open)
NIPPON PRECISION CIRCUITS—5
5 Page 
SM5849AF
Microcontroller interface (MCK, MDT, MLEN)
Parameter
M C K L OW -level pulsewidth
MCK HIGH-level pulsewidth
MDT setup time
MDT hold time
M L E N L OW -level pulsewidth
MLEN HIGH-level pulsewidth
MLEN setup time
MLEN hold time
Symbol
tM C W L
tM C W H
tM D S
tM D H
tM LW L
tM LW H
tM L S
tM L H
min
50
50
50
50
50
50
50
50
Rating
typ
–
–
–
–
–
–
–
–
max
–
–
–
–
–
–
–
–
Unit
ns
ns
ns
ns
ns
ns
ns
ns
MDT
MCK
MLEN
tMDS
tMCWL
tMDH
tMCWH
tMLS
tMLWL
tMLH
tMLWH
0.5VDD
0.5VDD
0.5VDD
Reset input (RSTN)
Parameter
Symbol
First HIGH-level pulsewidth after supply ON
RSTN pulsewidth
Note: tC Y is the system clock input cycle time.
tR S T = approximately 3.8µs when tC Y = 59ns.
tH R S T
tR S T
VDD
RSTN
tHRST
Rating
min typ max
– 640 –
64 –
–
Unit
tC Y
tC Y
tRST
NIPPON PRECISION CIRCUITS—11
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet SM5849F.PDF ] | |
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