NPC SM5849AF Datasheet

SM5849AF

NIPPON PRECISION CIRCUITS INC.

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 attenu­ator.

FEATURES

Functions

■

Left/right-channel processing (stereo)

■

2 to 100kHz input sample rate range (fsi)

■

4 to 200kHz output sample rate range (fso)

■

0.45 to 2.2-times variable sample rate conversion
ratio (fso/fsi)

■

Asynchronous input and output timing (clock
inputs)
System clock inputs (input and output clocks inde-

■

pendent)

• 256fsi or 384fsi input system clock select

• 256fso or 384fso output system clock select
Deemphasis filter

■

• IIR-type filter

• 44.1, 48 or 32kHz
Digital attenuator

■

• 11-bit data, 1025 levels

• Smooth attenuation change

• +12dB gain shift function
Direct mute function

■

Through mode operation

■

• Direct connection from input to output
Output data clocks (LRCO, BCKO)

■

• Slave mode: external input

• Master mode: output system clock generated
internally

Dither round-off processing

■

• Dither round-off ON/OFF selectable

3.3V single supply

■

80-pin QFP

■

Silicon-gate CMOS process

■

Filter Characteristics and Converter Efficiency

■

24-bit internal data word length

■

Deemphasis filter characteristics (IIR filter)

• ±0.03dB gain deviation from ideal filter charac­teristics

■

Anti-aliasing LPF characteristics

• Output/input sample rate conversion ratio auto­matic 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

Converter noise levels

■

• ≤ − 110dB internal calculation (quantization)
noise

• − 98dB (16-bit output), − 122dB (20-bit output),
and − 146dB (24-bit output) word rounding
noise

Output S/N ratio (theoretical values)

■

Output signal

w ord length

16 bits 94.8dB 97.7dB 97.7dB
20 bits 97.7dB 109.5dB 109.7dB
24 bits 97.7dB 109.7dB 110dB

16-bit input

w ord length

S/N ratio

20-bit input

w ord length

24-bit input

w ord length

NIPPON PRECISION CIRCUITS—1

Interfaces

SM5849AF

Input data format

■

• 2s-complement, L/R alternating, serial

• IIS/non-IIS format

Mode Word length Data position

1
2 Right justified LSB first

16 bits

3 Left justified MSB first
4 IIS MSB first
5
6 Right justified LSB first

20 bits

7 Left justified MSB first
8 IIS MSB first
9

10 Right justified LSB first

24 bits

11 Left justified MSB first
12 IIS MSB first

Right justified MSB first

Right justified MSB first

Right justified MSB first

APPLICATIONS

Data

sequence

Output data format

■

• 2s-complement, MSB first, L/R alternating,
serial

• Continuous bit clock

Mode Word length IIS selection Data position

1 16 bits

Right justified2 20 bits

Left justified

3 24 bits
4 24 bits
5 16 bits

7 24 bits

Normal

(non IIS)

IIS6 20 bits

Digital audio equipment-interface sample rate

■

conversion (AV amplifiers, CD-R, DAT, MD and
8mm VTRs)

ORDERING INFORMATION

De vice Pack ag e

SM5849AF 80-pin QFP

Commercial recording/editing equipment sample

■

rate conversion

NIPPON PRECISION CIRCUITS—2

PINOUT

VDD

OCKSL

OCLK

VSS
LRCO
BCKO

DOUT

N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.

VSS

605958575655545352

61
62
63
64
65
66
67
68
69

SM5849AF

70
71
72
73
74
75
76
77
78
79
80

1

N.C.

2DI3

N.C.

4

N.C.

5

N.C.

6

SM5849AF

Top view

N.C.

N.C.

N.C.

N.C.

N.C.

SLAVE

5150494847464544434241

JAPAN

7

8

10

THRUN

RSTN

DITHN

12

TST2N

STATE

IISN

OWL1

OWL2

VDD

20

40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21

VSS
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
MLEN/DEEM
MCK/FSI2
MDT/FSI1
MCOM
DMUTE
VDD

PACKAGE DIMENSIONS

(Unit: mm)

80-pin QFP

14
12

0.1140.4
12

VDD VSS

0.4

0.1

LRCI

BCKI

VSS

ICLK

ICKSL

IFM19IFM2

IWL111IWL2

N.C.13N.C.14N.C.15N.C.16N.C.17N.C.18N.C.19N.C.

VSS

0.5

0.18

0.1

0.05

0.1

1.7max

1.4 0.1

0.05

0.125

0.025

0 to 10

0.5 0.2

NIPPON PRECISION CIRCUITS—3

BLOCK DIAGRAM

SM5849AF

IFM2

IFM1

IWL2IWL1

BCKI DI

MCOM

MDT/FSI1

MCK/FSI2

MLEN/DEEM

ICLK

ICKSL

LRCI

RSTN

DITHN

TST2N

OWL1
OWL2

IISN

Deemphasis and
attenuator setup

Input-stage

divider

Input timing

controller

Filter characteristic

select

Output operation

timing controller

Output format

controller

Input data

interface

Arithmetic

operations

Deemphasis

operation

Attenuator

Interpolation

filter operation

Dither

operation

Output

operation

Output data

interface

SLAVE

OCLK

OCKSL

THRUN

DMUTE

Output-stage

clock select

Output-stage

divider

Mute

generator

LRCI BCKI DI

Through mode

switching

Direct mute

LRCO BCKO DOUT

NIPPON PRECISION CIRCUITS—4

STATE

SM5849AF

PIN DESCRIPTION

Number Name I/O

1 V D D – Supply voltage
2 DI Ip Digital input signal
3 BCKI Ip Bit clock input
4 LRCI Ip Word clock input
5 VS S – Ground
6 ICLK I System clock input
7 ICKSL Ip System clock select. 384fs clock when HIGH, and 256fs clock when LOW .

8 IFM1 Ip

9 IFM2 Ip

1

Input format select

IFM1 IFM2 Data position

L O W LO W Right justified
LOW HIGH Right justified
HIGH LOW Left justified
HIGH HIGH IIS

1. Data is in LSB first sequence

Description

1

Input word length select

10 IWL1 Ip

11 IWL2 Ip

12 N C – No connection (must be open)
13 N C – No connection (must be open)
14 N C – No connection
15 N C – No connection (must be open)
16 N C – No connection (must be open)
17 N C – No connection (must be open)
18 N C – No connection (must be open)
19 N C – No connection (must be open)
20 V SS – Ground
21 V D D – Supply voltage
22 DMUTE Ip Direct mute pin. Muting ON when HIGH.
23 MCOM Ip Microcontroller control select. Microcontroller control when HIGH.

24 MDT/FSI1 Ip

25 MCK/FSI2 Ip

26 MLEN/DEEM Ip
27 N C – No connection (must be open)

28 N C – No connection (must be open)
29 N C – No connection (must be open)
30 N C – No connection (must be open)
31 N C – No connection (must be open)
32 N C – No connection (must be open)
33 N C – No connection (must be open)
34 N C – No connection (must be open)
35 N C – No connection (must be open)
36 N C – No connection (must be open)
37 N C – No connection (must be open)

IWL1 IWL2 Data length

L O W LOW 16 bits
LOW HIGH 24 bits
HIGH LOW 20 bits
HIGH HIGH 24 bits

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)

NIPPON PRECISION CIRCUITS—5

SM5849AF

Number Name I/O

1

Description

38 N C – No connection (must be open)
39 N C – No connection (must be open)
40 V SS – Ground
41 V D D – Supply voltage

Output word length select

42 OWL2 Ip

OW L 1 O W L 2 Data length

L O W LOW 16 bits
LOW HIGH 24 bits
HIGH LOW 20 bits

43 OWL1 Ip

HIGH HIGH 24 bits

1

1. Data is in left justifie d sequence.

44 IISN Ip IIS output mode select. N ormal mode when HIGH, and IIS mode when LOW .
45 S TATE O Status output
46 TST2N Ip IC test mode pin 2. Test mode when LOW . Leave HIGH or open circuit for normal operation.
47 DITHN Ip Output dither control pin. Dither when LOW , and normal mode when HIGH.
48 RSTN Ip Reset input. Reset when LOW .
49 T HR UN Ip Through mode set. Normal mode when HIGH, and through mode when LOW.
50 S LAV E Ip Slave mode set. Slave mode when HIGH, and master mode when LOW .
51 N C – No connection (must be open)
52 N C – No connection (must be open)
53 N C – No connection (must be open)
54 N C – No connection (must be open)
55 N C – No connection (must be open)
56 N C – No connection (must be open)
57 N C – No connection (must be open)
58 N C – No connection (must be open)
59 N C – No connection (must be open)
60 V SS – Ground
61 V D D – Supply voltage
62 OCKSL Ip Output system clock select. 384fs when HIGH, and 256fs when LOW .
63 OCLK I Output system clock input
64 V SS – Ground
65 LRCO O Word clock output
66 BC K O O Bit clock output
67 DOUT O Data output
68 N C – No connection (must be open)
69 N C – No connection (must be open)
70 N C – No connection (must be open)
71 N C – No connection (must be open)
72 N C – No connection (must be open)
73 N C – No connection (must be open)
74 N C – No connection (must be open)
75 N C – No connection (must be open)
76 N C – No connection (must be open)
77 N C – No connection (must be open)
78 N C – No connection (must be open)
79 N C – No connection (must be open)
80 V SS – Ground

1. Ip = input pin with internal pull-up resistor

NIPPON PRECISION CIRCUITS—6

SPECIFICATIONS

−

+

Absolute Maximum Ratings

V

= 0V

SS

SM5849AF

−

−

°

−

° C

−

Parameter Symbol Rating

Supply voltage range V
Input voltage range V
Storage temperature range T
Po w er dissipation P

DD

IN

stg

D

V

SS

1

0.3 to 4.0 V

0.3 to V

0.3 V

DD

55 to 125

400 m W

Unit

C

1. Ratings also apply at supply switch ON and OFF.

Recommended Operating Conditions

V

= 0V

SS

Parameter Symbol Rating Unit

Supply voltage range V
Operating temperature range T

DD

opr

3.0 to 3.6 V
40 to 85

DC Electrical Characteristics

V

= 3.0 to 3.6V, V

DD

Parameter Symbol Condition

Current consumption I
HIGH-level input voltage
L O W -level input voltage
HIGH-level input voltage
L O W -level input voltage
HIGH-level output voltage
L O W-level output voltage
HIGH-level input current
L O W -level input current

Input leakage current

1

1. Pins ICLK and OCLK.

2. Pins DI, BCKI, LRCI, ICKSL, IFM1, IFM2, IWL1, IWL2, DMUTE, MCOM, MDT/FSI1, MCK/FSI2, MLEN/DEEM, OWL1, OWL2, IISN, DITHN,
TST2N, RSTN, THRUN, SLAVE, OCKSL.

3. Pins STATE, LRCO, BCKO, DOUT.

1

2

2

2

1

2

3

3

= 0V, T

SS

= − 40 to 85 ° C

a

DD

V

IH1

V

IL1

V

IH2

V

IL2

V

OH

V

OL

I

IH

I

IL

I

LH

I

LL

Rating

Unit

min typ ma x

No output load – 70 1 00 m A

2.0 – – V
– – 0.8 V

2.0 – – V
– – 0.8 V

I

=

1.0mA V

OH

I

= 1.0mA – – 0.4 V

OL

V

= V

IN

DD

V

= 0V – – 90 µ A

IN

V

= V

IN

DD

V

= 0V – – 1.0 µ A

IN

–0.4 – – V

DD

– – 1.0 µA

– – 1.0 µA

NIPPON PRECISION CIRCUITS—7

AC Electrical Characteristics

Input clock (ICLK)

SM5849AF

Parameter Symbol

HIGH-level clock pulsewidth t

L O W -level clock pulsewidth t

Clock pulse cycle t

Output clock (OCLK)

Parameter Symbol

HIGH-level clock pulsewidth t

L O W -level clock pulsewidth t

Clock pulse cycle t

CWH1

CWL1

CY1

CWH2

CWL2

CY2

Condition Rating

System clock m in typ ma x

256fsi 17.5 – –
384fsi 11.7 – –
256fsi 17.5 – –
384fsi 11.7 – –
256fsi 39.0 – 2000
384fsi 26.0 – 1300

Condition Rating

System clock m in typ ma x

256fso 8.7 – –
384fso 5.8 – –
256fso 8.7 – –
384fso 5.8 – –
256fso 19.5 – 1000
384fso 13.0 – 650

Unit

ns

ns

ns

Unit

ns

ns

ns

ICLK and OCLK timing

ICLK

OCLK

t

CWH1,

t

CWH2

t

CY1,

0.5V

DD

t

t

CWL2

CWL1,

t

CY2

NIPPON PRECISION CIRCUITS—8