NPC SM5847AF Datasheet

SM5847AF

NIPPON PRECISION CIRCUITS INC.

High-fidelity Digital Audio, Multi-function Digital Filter

OVERVIEW

The SM5847AF is a 4/8-times oversampling (inter­polation), 2-channel, linear-phase FIR, multi-func­tion digital filter for digital audio reproduction
equipment. It features independent left and right­channel digital deemphasis filters and soft muting
function.

The input/output interface supports input data in
16/18/20/24-bit words, and output data in
18/20/22/24-bit words in either 4-times or 8-times
oversampling selectable output mode.

FEATURES

■

Left/right-channel (2-channel processing)

■

4-times/8-times oversampling (interpolation)

• 8-times interpolation filter

- 3-stage linear-phase FIR configuration
1st stage (fs to 2fs): 169-tap
2nd stage (2fs to 4fs): 29-tap
3rd stage (4fs to 8fs): 17-tap

- ≤ ±0.00002 dB passband ripple (0 to

0.4535fs)

- ≥ 117 dB stopband attenuation (0.5465fs to

7.4535fs)

• 4-times interpolation filter

- 2-stage linear-phase FIR configuration
1st stage (fs to 2fs): 169-tap
2nd stage (2fs to 4fs): 29-tap

- ≤ ±0.00002 dB passband ripple (0 to

0.4535fs)

- ≥ 116 dB stopband attenuation (0.5465fs to

3.4535fs)

■

Digital deemphasis

• IIR filter configuration

• fs = 32kHz, 44.1kHz, 48kHz

• 2-channel independent ON/OFF control

■

26 × 24-bit parallel multiplier/32-bit accumulator

■

Overflow limiter

■

Soft muting

• 2-channel independent ON/OFF control

■

Input data format

The internal system clock operates at either 192fs or
256fs selectable speed (where fs is the audio sam­pling frequency). Plus, the divide-by 1, 2, or 4
counter settings means that external clocks of 768fs/
384fs/192fs (192fs input) and 1024fs/512fs/256fs
(256fs input) are supported.

The SM5847AF operates from a single 3 to 5 V sup­ply, and is available in 44-pin QFP packages.

• 2s complement, MSB first

• 3 selectable formats

- LR alternating, 16/18/20/24-bit serial, right­justified data

- LR alternating, 24-bit serial, left-justified
data

- LR simultaneous, 24-bit serial, left-justified
data

■

Output data format

• 2s complement, MSB first, LR simultaneous

• 18/20/22/24-bit serial

• BCKO burst (NPC format)

■

Dither round-off processing

• Dither round-off ON/OFF selectable

■

25-bit internal data word length

■

Internal system clock

• 192fs/256fs selectable

• Maximum operating frequency
192fs mode: 37 MHz max (5 V)

20.7 MHz max (3 V)

256fs mode: 27.6 MHz max (5 V)

25 MHz max (3 V)

■

Jitter-free function

• Jitter-free/Sync mode selectable

■

Crystal oscillator circuit built-in

■

3 to 5 V supply

■

44-pin plastic QFP

■

CMOS process

ORDERING INFORMATION

De vice Pack ag e

SM5847AF 44-pin QFP

NIPPON PRECISION CIRCUITS—1

PINOUT

(T op V iew)

SM5847AF

OMD

DOR
DOL

WCKO

BCKO

VSS

VSSAC

VDDAC

VDD

DG

NC

PACKAGE DIMENSIONS

(Unit: mm)

44-pin plastic QFP

MUTEL

DITHN

MUTER

42

43

44

1
2
3
4
5
6
7
8

9
10
11

1213141516171819202122

VSS

CKO

VDD

FSEL2

41

SM58 4

7AF

XTO

FSEL1

40

XTI

VSS

39

VSS

VDD

38

VDD

DEMPL

DEMPR

36

37

LRCI

DI/INF2N

CKDV2

CKDV1

34

35

NC

BCKI

33

RSTN

32

SYNCN

31

OW2N

30

OW1N

29

VDD

28

VSS

27

IW2N/DIR

26

IW1N/DIL

25

INF1N

24

CKSLN

23

NC

0.30

+

−

12.80

+

10.00 0.30

+

0.17 0.05

+

12.80

0.30

−

+

10.00 0.30

−

0.17

+

0.05

−

(1.40)

−

0 to 10

0.35

4

−

C 0.7

+

0.10

−

0.20 M

0.60

+

0.20

−

(1.40)

−

0.80

0.15

+

−

0.15 0.05

0.20
+

−

1.50 0.10

NIPPON PRECISION CIRCUITS—2

BLOCK DIAGRAM

SM5847AF

XTI
XTO
CKO

CKSLN

CKDV1
CKDV2

SYNCN

RSTN

DEMPL

DEMPR

FSEL1
FSEL2

MUTEL

MUTER

System

Clock

Timing

Controller

Deemphasis

Controller

Mute

Controller

LRCI

BCKI

Input Data

Interface

Filter and

Attenuation

Arithmetic

Block

Output Data

Interface

Block

DI/INF2N

IW1N/DIL
IW2N/DIR
INF1N

DITHN

VDD
VSS

VDDAC
VSSAC

OMD
OW1N
OW2N

DG

BCKO

DOL

WCKO

DOR

NIPPON PRECISION CIRCUITS—3

SM5847AF

PIN DESCRIPTION

Number Name I/O Description

1

1 OMD Ip
2 DOR O
3 DOL O
4 WCKO O
5 BCKO O
6 VS S – Ground
7 VSSAC – Ground
8 V D D AC – Supply voltage

9 V D D – Supply voltage
10 D G O
11 N C – No internal connection (must be open)
12 CKO O
13 VS S – Ground
14 V D D – Supply voltage
15 X TO O Oscillator output
16 XTI I Oscillator input/master clock input
17 VS S – Ground
18 V D D – Supply voltage
19 LRCI I
20 DI/INF2N I
21 BCKI I
22 N C – No internal connection (must be open)
23 N C – No internal connection (must be open)
24 CKSLN Ip
25 INF1N Ip
26 IW1N/DIL Ip
27 IW2N/DIR Ip
28 VS S – Ground
29 V D D – Supply voltage
30 OW1N Ip
31 OW2N Ip
32 SYNCN Ip
33 RSTN Ip
34 CKDV1 Ip
35 CKDV2 Ip
36 DEMPR Ip
37 DEMPL Ip
38 V D D – Supply voltage
39 VS S – Ground
40 FSEL1 Ip
41 FSEL2 Ip
42 MUTEL Ip
43 MUTER Ip
44 DITHN Ip

1. Schmitt input, TTL level

2. TTL level
Ip = Pull-up input

Output data rate (4fs/8fs) select pin

2

Right-channel data output

2

Left-channel data output

2

Word clock output

2

Bit clock output

2

Deglitched signal output

2

Master clock output

1

Input data sample rate (fs) clock input

1

Data input/input format select pin 2

1

Bit clock input

2

Master clock frequency (192fs/256fs) select pin

2

Input format select pin 1

1

Input data word length select pin 1/left-channel data input

1

Input data word length select pin 2/right-channel data input

2

Output data word length select pin 1

2

Output data word length select pin 2

2

Sync mode select pin

1

Reset input

1

Internal system clock frequency divider set pin 1

1

Internal system clock frequency divider set pin 2

1

Right-channel deemphasis ON/OFF pin

1

Left-channel deemphasis ON/OFF pin

1

Deemphasis filter sample rate (fs) select pin 1

1

Deemphasis filter sample rate (fs) select pin 2

1

Left-channel mute ON/OFF pin

1

Right-channel mute ON/OFF pin

1

Output data dither ON/OFF pin

NIPPON PRECISION CIRCUITS—4

−

+

( °

−

−

°

≤

°

°

−

° C

−

−

−

−

−

−

−

SM5847AF

SPECIFICATIONS

Absolute Maximum Ratings

V

= V

SS

Supply voltage range
Input voltage range V
Storage temperature range T

Po w er dissipation P

1. Supply lines for VDD and VDD AC, and ground lines for VSS and VSSAC, should be connected on the printed circuit board to prevent device break­do wn due to potential difference when the power is applied.

= 0 V, V

SSAC

Parameter Symbol Condition Rating Unit

1

DD

= V

DDAC

V

DD

, V

DDAC

I

stg

D

70

C 900

≤ 85

C 700

0.3 to 6.5 V

V

SS

0.3 to V
55 to 125

0.3 V

DD

C

mW

Recommended Operating Conditions

V

= V

SS

Supply voltage range
Operating temperature range T

1. The minimum required operating voltage and consequent operating temperature vary with the maximum operating frequency and sampling mode
selected, as shown in the following table.

V

= V

SS

Sampling frequency

1. Mode with internal frequency divider ratio set to 1 (CKDV1 = CK DV2 = L OW) .

2. 96 kHz + 12.5% variable pitch

3. 48 kHz + 15% variable pitch

SSAC

SSAC

fs (kHz)

192

2

108

96

3

55.2

= 0 V, V

1

= 0 V, V

= V

DD

DDAC

Parameter Symbol Rating Unit

V

DD

, V

DD

DDAC

a

= V

DDAC

Internal system clock

1

Mode

192fs 37 4.75 (5.0
256fs Not guaranteed Not guaranteed Not guaranteed
192fs 20.7 3.00 (3.3 −
256fs 27.6 4.50 (5.0
192fs 18.5 3.00 (3.3
256fs 25 3.00 (3.3
192fs 10.6 3.00 (3.3 −
256fs 14.2 3.00 (3.3

Maximum operating

frequency (MHz)

Minimum supply voltage

3.00 to 5.25 V
40 to 85

V

, V

DDAC

10%)
10%)
10%)
10%)
10%)
10%)

(V)

5%)

DD

Operating temperature

T

C)

a

40 to 70

40 to 85

NIPPON PRECISION CIRCUITS—5

DC Electrical Characteristics

V

DD

= V

= 3.00 to 5.25 V, V

DDAC

SS

= V

SSAC

SM5847AF

= 0 V, T

= − 40 to 85 ° C

a

Parameter Symbol Condition

HIGH-level input voltage
HIGH-level input voltage

HIGH-level input voltage

L O W -level input voltage

L O W -level input voltage

L O W -level input voltage

Input leakage current
Input current

3,4

1

2,4

3

1

2,4

3

1,2

HIGH-level output voltage
L O W-level output voltage

min typ max

V

IH1

V

IH2

V

= V

V

IH3

V

IL1

DD

V

DD

V

DD

V

DD

VDD = V

V

IL2

VDD = V
VDD = V

V

IL3

I

IL1

I

IL2

5

5

V

OH

V

OL

VDD = V
VIN = 0 to 5.25 V
VIN = 0 V
IOH = −4 mA 2.4 – – V
IOL = 4 mA – – 0.4 V

= 4.75 to 5.25 V 2.4 – –

DDAC

= V

= 3.00 to 4.75 V 2.0 – –

DDAC

= V

= 4.75 to 5.25 V – – 0.3V

DDAC

= V

= 3.00 to 4.75 V – – 0.2V

DDAC

= 4.75 to 5.25 V – – 0.8

DDAC

= 3.00 to 4.75 V – – 0.2V

DDAC

= 4.75 to 5.25 V – – 0.8

DDAC

= 3.00 to 4.75 V – – 0.2V

DDAC

0.7V

DD

––V

2.0 – – V

DD

DD

DD

DD

−

10 – 10 µA

−

10

−

50

−

120 µA

Unit

V

V

V

V

1. Pin XTI

2. Pins LRCI, DI/INF2N, BCKI

3. Pins IW1N/DIL, IW2N/DIR

4. Pins OMD, CKSLN, INF1N, OW1N, OW2N, SYNCN, RSTN, CKDV1, CKDV2, DEMPR, DEMPL, FSEL1, FSEL2, MUTEL, MUTER, DITHN

5. Pins DOR, DOL, W C K O , BCKO, DG, CKO

Rating

V

DD

= V

= 4.75 to 5.25 V, V

DDAC

Parameter Symbol Condition

Current consumption

V

DD

= V

= 3.00 to 3.60 V, V

DDAC

Parameter Symbol Condition

Current consumption

SS

I

DD1

I

DD2

I

DD3

I

DD4

I

DD5

SS

I

DD6

I

DD7

= V

SSAC

= 0 V, T

192fs, XTI = 2 7 ns (37 MHz),
fs = 192 kHz,Ta = −40 to 70 °C

256fs, XTI = 4 0 ns (25 MHz),
fs = 9 6 kH z

384fs, XTI = 2 7 ns (37 MHz),
fs = 96 kHz, estimated value

192fs, XTI = 54 ns (18.5 MHz),
fs = 96 kHz, estimated value

384fs, XTI = 54 ns (18.5 MHz),
fs = 48 kHz, estimated value

= V

SSAC

= 0 V, T

256fs, XTI = 81 ns (12.3 MHz),
fs = 48 kHz, estimated value

384fs, XTI = 54 ns (18.5 MHz),
fs = 48 kHz, estimated value

= − 40 to 85 ° C, XTI = external input, no output load

a

Rating

Unit

min typ max

– – 166 m A

– – 115 m A

– – 105 m A

––95mA

––65mA

= − 40 to 85 ° C, XTI = external input, no output load

a

Rating

Unit

min typ max

––27mA

––28mA

NIPPON PRECISION CIRCUITS—6

AC Electrical Characteristics

Crystal oscillator (XTI, XTO)

SM5847AF

VDD = V

Oscillator frequency

1. External circuit components should be matched for the crystal oscillator element used.

= 3.00 to 5.25 V, VSS = V

DDAC

Parameter Symbol Condition

1

f

OSC

= 0 V, Ta = −40 to 85 °C

SSAC

Rating

Unit

min typ max

– – 50 MHz

External clock input (XTI)

VDD = V

Master clock frequency f
Master clock duty 1/2VDD thresholds 40 – 60 %

= 3.00 to 5.25 V, VSS = V

DDAC

Parameter Symbol Condition

XTI

= 0 V, Ta = −40 to 85 °C

SSAC

Rating

Unit

min typ max

– – 60 MHz

Internal system clock

The crystal oscillator frequency or external clock input master clock frequency ratings are described in the pre­ceding tables, but it is the internal system clock frequency rating, set by the internal frequency divider
(CKDV1, CKDV2), that must be satisfied. The master clock frequency is a multiple of the sampling frequency
fs.

CKDV1 = CKDV2 = LOW (internal system clock frequency = XTI input frequency),
VSS = V

256fs (CKSLN = LOW, CKDV1 = LOW, CKDV2 = LOW)

System clock frequency f

192fs (CKSLN = HIGH, CKDV1 = LOW , CKDV2 = LOW)

System clock frequency f

= 0 V, Ta = −40 to 85 °C

SSAC

Parameter Symbol Condition

SYS1

SYS2

VDD = V
VDD = V

VDD = V
Ta = −40 to 70 °C

VDD = V

= 4.50 to 5.25 V 0.256 – 27.6

DDAC

= 3.00 to 5.25 V 0.256 – 2 5

DDAC

= 4.75 to 5.25 V,

DDAC

= 3.00 to 5.25 V 0.384 – 20.7

DDAC

Rating

min typ max

0.384 – 3 7

Unit

MHz

MHz

NIPPON PRECISION CIRCUITS—7

SM5847AF

Serial input timing (BCKI, LRCI, DI/INF2N, IW1N/DIL, IW2N/DIR)

VSS = V

BCKI pulse cycle t

BCKI HIGH-level pulsewidth t

BCKI LOW-level pulsewidth t

DI, DIL, DIR setup time t

DI, DIL, DIR hold time t

Last BCKI rising edge to LRCI edge t

LRCI edge to first BCKI rising edge t

= 0 V, Ta = −40 to 85 °C

SSAC

Parameter Symbol Condition

IBCY

BCWH

BCWL

DS

DH

BL

LB

Rating

Unit

min typ max

Note 1 55 – –

nsNote 2 80 – –
Note 3 100 – –
Note 1 25 – –

nsNote 2 35 – –
Note 3 45 – –
Note 1 25 – –

nsNote 2 35 – –
Note 3 45 – –
Note 1 10 – –

nsNote 2 20 – –
Note 3 30 – –
Note 1 10 – –

nsNote 2 20 – –
Note 3 30 – –
Note 1 10 – –

nsNote 2 20 – –
Note 3 30 – –
Note 1 10 – –

nsNote 2 20 – –
Note 3 30 – –

1. CKSLN = HIGH (192fs), VDD = V

2. CKSLN = LOW (256fs), VDD = V
CKSLN = HIGH (192fs), VDD = V

3. CKSLN = LOW (256fs), V

DD

= V

BCKI

DI
DIL
DIR

LRCI

= 4.75 to 5.25 V, Ta = −40 to 70 °C

DDAC

= 4.50 to 5.25 V

DDAC

= 3.00 to 4.75 V

DDAC

= 3.00 to 4.50 V

DDAC

tDS

tIBCY

tBCWH tBCWL

tDH

tBL

NIPPON PRECISION CIRCUITS—8

1.5V

1.5V

tLB

1.5V

Reset timing (RSTN)

SM5847AF

VDD = V

= 3.00 to 5.25 V, VSS = V

DDAC

= 0 V, Ta = −40 to 85 °C

SSAC

Parameter Symbol Condition

RSTN LOW-level reset pulsewidth t

1. t

is equal to 1/f

MCK

XTI

or 1/f

. For example, t

OSC

RST

= 54 ns when f

RST

= 37 MHz.

XTI

RSTN

Output timing (CKO, BCKO, WCKO, DOL, DOR, DG)

VDD = V

XTI falling edge to CKO falling edge delay t

BCKO falling edge to WCKO, DOL, DOR,
DG delay

B C K O r ising edge to W CK O falling edge t
W CK O falling edge to BCKO rising edge t
BC KO per iod t
BC KO HIGH-level pulsewidth t
B CK O L OW -level pulsewidth t
DOL, DOR setup time t
DOL, DOR hold time t
B C K O r ising edge to W CK O falling edge t
W CK O falling edge to BCKO rising edge t
BC KO per iod t
BC KO HIGH-level pulsewidth t
B CK O L OW -level pulsewidth t
DOL, DOR setup time t
DOL, DOR hold time t

= 4.75 to 5.25 V, VSS = V

DDAC

= 0 V, Ta = −40 to 70 °C, CL = 50 pF

SSAC

Parameter Symbol Condition

XTO

VDD = V

DDAC

Ta = −40 to 85 °C

t

BDO

WOH

Output mode: 8fs

WOS

OBCY

OBCH

OBCL

ODS

ODH

WOH

WOS

OBCY

OBCH

OBCL

ODS

ODH

OMD = HIGH (fs = 192 kHz)
External clock input:
XTI = 27 ns (37 MHz),
CKSLN = HIGH (192fs)
Divider ratio: 1
CK DV1 = CKDV2 = LOW
Output data length: 24 bits
OW1N = OW2N = LOW

Output mode: 4fs
OMD = LOW (fs = 192 kHz)
External clock input:
XTI = 27 ns (37 MHz),
CKSLN = HIGH (192fs)
Divider ratio: 1
CK DV1 = CKDV2 = LOW
Output data length: 24 bits
OW1N = OW2N = LOW

= 3.00 to 5.25 V,

1

min

2t

MCK

tRST

min typ max

4–9ns

4–11ns

−

4– 2ns

8––ns
8––ns

27 – – ns

7––ns
7––ns
7––ns

7––ns
17 – – ns
17 – – ns
54 – – ns
18 – – ns
18 – – ns
18 – – ns
18 – – ns

Rating

typ ma x

Unit

––ns

1.5V

Rating

Unit

NIPPON PRECISION CIRCUITS—9