NPC SM5843AP1, SM5843AS1 Datasheet

SM5843A × 1

NIPPON PRECISION CIRCUITS INC.

OVERVIEW

The SM5843A × 1 is a multi-function digital filter IC,
fabricated using NPC’s Molybdenum-gate CMOS
process, for digital audio reproduction equipment. It
features 8-times oversampling (interpolation), digital
deemphasis and soft muting functions. It accepts 16,
18, or 20-bit input data, and outputs data in 18 or 20­bit format. It operates using either a 384fs or 256fs
system clock.

FEATURES

Filter configuration (2-channel processing)

■

• 8-times oversampling (interpolation)

- 3-stage FIR configuration

• Deemphasis filter

- IIR filter configuration for correct gain and
phase characteristics

- 2-channel independent ON/OFF control

- 32/44.1/48 kHz sampling frequency (fs)

• 21 × 22-bit parallel multiplier/25-bit
accumulator for high precision

• Overflow limiter

■

2 oversampling filter characteristics

• Sharp roll-off characteristic (response 1)

- ≤ ±0.00005 dB passband ripple (0 to

0.4535fs)

- ≥ 110 dB stopband attenuation (0.5465fs to

7.4535fs)

• Slow roll-off characteristic (response 2)

- ≤ ±0.00003 dB passband ripple (0 to 0.235fs)

- ≥ 77 dB stopband attenuation (0.745fs to

7.255fs)

■

Soft muting

■

Digital attenuator

■

Input data format

• 2s complement, MSB first

- LR alternating, 16/18/20-bit serial, trailing

data

- LR alternating, 20-bit serial, leading data

- LR simultaneous, 20-bit serial, leading data

■

Output data format

• 2s complement, MSB first, LR simultaneous

• 18/20-bit serial

• BCKO burst (NPC format)

■

Dither processing ON/OFF control

■

Jitter-free/Sync mode selectable

■

256fs/384fs system clock selectable

• 21.2/14.2MHz maximum frequency
(384fs/256fs)

Audio Multi-function Digital Filter

5 V supply

■

Crystal oscillator circuit built-in

■

TTL-compatible input/outputs

■

28-pin plastic DIP and SOP

■

Molybdenum-gate CMOS

■

APPLICATIONS

■

CD players

■

DAT players

■

PCM systems

ORDERING INFOMATION

Device Package

SM5843AP1 28pin DIP
SM5843AS1 28pin SOP

NIPPON PRECISION CIRCUITS—1

SM5843A × 1

PINOUT

28-pin DIP

(TOP VIEW)

1DI / INF2N
2BCKI
3CKSLN
4INF1N
5IW1N / DIL
6XTI
7XTO
8VSS

9CKO
10IW2N / DIR
11MDT
12MDK
13MLEN
14RSTN 15 MUTE

28 LRCI
27 TMOD2
26 BCKO

SM5843AP1

25 WCKO
24 DOL
23 DOR
22 VDD
21 TMOD1
20 SYNCN
19 OW20N
18 FSEL2
17 FSEL1
16 DEMP

PACKAGE DIMENSIONS

28-pin DIP

3.8 0.1

2.54

28-pin SOP 28-pin SOP

(Unit: mm)

0° to 15°

13.8 0.2

37.3 0.3

+

0.30

1.5

0.05

−

0.45 0.1

4.5 0.3

3.2 0.2

3.2 0.2

7.7 0.5

15.2

0.10

0.05

+

−

0.25

1DI / INF2N

2BCKI

3CKSLN

4INF1N

5IW1N / DIL

6XTI

7XTO

8VSS

9CKO
10IW2N / DIR
11MDT
12MDK
13MLEN
14RSTN 15 MUTE

SM5843AS1

28 LRCI
27 TMOD2
26 BCKO
25 WCKO
24 DOL
23 DOR
22 VDD
21 TMOD1
20 SYNCN
19 OW20N
18 FSEL2
17 FSEL1
16 DEMP

1.27 ± 0.15

18.3 TYP

0.45TYP.

+ 0.10

0.4 − 0.05

0.6MAX.

8.4TYP

3.0MAX.

11.8 0.3

0.10MIN.

3.0MAX

1.0 0.2

0° to 10°

0.15 − 0.05

+ 0.10

0° to 10°

NIPPON PRECISION CIRCUITS—2

BLOCK DIAGRAM

SM5843A × 1

CKSLN LRCI BCKI DI / INF2N

IW1N / DIL
IW2N / DIR

XTI
XTO
CKO

TOMD2

RSTN

SYNCN

DEMP

FSEL1
FSEL2

MUTE

System

Clock

Timing

Controller

Deemphasis

Controller

Mute/ Attenuation

Controller

Input data Interface

Filter and Attenuation

Arithmetic block

Output date

Interface

INF1N

TMOD1

BCKO
WCKO

DOL
DOR

OW20N

MDT

MCK

VDDMLEN VSS

NIPPON PRECISION CIRCUITS—3

PIN DESCRIPTION

SM5843A × 1

Number Name I/O

1 DI/INF2N Ip Data input when INF1N is LOW, and input format select pin when INF1N is HIGH.
2 BCKI Ip Input bit clock
3 CKSLN Ip Oscillator and system clock select input. 384fs when HIGH, and 256fs when LOW.

4 INF1N Ip

5 IW1N/DIL Ip

1

Input format select pin. INF1N and INF2N select the pin functions below.

INF1N DI/INF2N Input format

LOW LOW

LR alternating, trailing data DI IW1N IW2N

LOW HIGH
HIGH LOW LR alternating, leading data
HIGH HIGH LR simultaneous, leading data

Input bit length select pin when INF1N is LOW, and left-channel data input when INF1N is HIGH.
IW1N and IW2N select the input data length.

INF1N IW2N/DIL IW1N/DIR Input bit length

LOW

HIGH ××20 bits

Description

Pin function selection

DI/INF2N IW1N/DIL IW2N/DIR

INF2N DIL DIR

LOW LOW 20 bits

LOW HIGH 20 bits
HIGH LOW 18 bits
HIGH HIGH 16 bits

6 XTI I Oscillator input connection
7 XTO O Oscillator output connection
8 VSS – Ground
9 CKO O Oscillator output clock. Same frequency as XTI.

10 IW2N/DIR Ip

11 MDT Ip Attenuator serial data input
12 MCK Ip Attenuator bit clock input
13 MLEN Ip Attenuator latch enable input
14 RSTN Ip System reset. Reset operation when LOW, and normal operation when HIGH.
15 MUTE Ip Mute control signal. Muting when HIGH, and normal operation when LOW.
16 DEMP Ip Deemphasis control signal. OFF when LOW, and ON when HIGH.

17 FSEL1 Ip

18 FSEL2 Ip

19 OW20N Ip Output bit length select pin. 20-bit output when LOW, and 18-bit output when HIGH.
20 SYNCN Ip Sync mode select pin. Normal sync mode when LOW, and jitter-free mode when HIGH.
21 TMOD1 Ip Dither processing control. ON when LOW, and OFF when HIGH.
22 VDD – 5 V supply

Input bit length select pin when INF2N is LOW, and right-channel data input when INF2N is HIGH.
IW1N and IW2N select the input data length as shown in the table for pin 5.

Deemphasis filter select inputs

FSEL1 FSEL2 Sampling frequency (fs)

LOW LOW 44.1 kHz

LOW HIGH 48 kHz
HIGH LOW Test mode
HIGH HIGH 32 kHz

NIPPON PRECISION CIRCUITS—4

SM5843A × 1

Number Name I/O

23 DOR O Right-channel data output
24 DOL O Left-channel data output
25 WCKO O Output word clock
26 BCKO O Output bit clock

27 TMOD2 Ip

28 LRCI Ip Input data sample rate (fs) clock

1. I = input, Ip = Input with pull-up resistor, O = output

1

Filter characteristic select pin. Sharp roll-off (response 1) when HIGH, and slow roll-off (response 2)
when LOW.

Description

NIPPON PRECISION CIRCUITS—5

SM5843A × 1

SPECIFICATIONS

Absolute Maximum Ratings

V

= 0 V

SS

Parameter Symbol Rating Unit

Supply voltage range V
Input voltage range V
Storage temperature range T

Power dissipation P

Soldering temperature T
Soldering time t

−

−

+

−

°

°

−

° C

−

° C

DD

IN

stg

0.3 to 7.0 V

0.3 to V

0.3 V

DD

40 to 125

C

550 (DIP)

D

sld

sld

390 (SOP)

255

10 s

mW

C

Recommended Operating Conditions

fs = 384fs (CKSLN = HIGH): V

Parameter Symbol Rating Unit

Supply voltage range V
Operating temperature range T

fs = 256fs (CKSLN = LOW): V

Parameter Symbol Rating Unit

Supply voltage range V
Operating temperature range T

SS

SS

= 0 V

= 0 V

DD

opr

DD

opr

4.5 to 5.5 V
20 to 80

4.75 to 5.25 V
20 to 70

DC Electrical Characteristics

V

= 4.5 to 5.5 V, V

DD

Parameter Symbol Condition

Current consumption I
XTI HIGH-level input voltage V
XTI LOW-level input voltage V
XTI AC-coupled input voltage V
HIGH-level input voltage
LOW-level input voltage
HIGH-level output voltage
LOW-level output voltage
XTI HIGH-level input current I
XTI LOW-level input current I
LOW-level input current
Input leakage current

1. f

= 256fs = 14.2 MHz (CKSLN = LOW), no output load

SYS

2. Pins DI/INF2N, BCKI, CKSLN, INF1N, IW1N/DIL, IW2N/DIR, MDT, MCK, MLEN, RSTN, MUTE, DEMP, FSEL1, FSEL2, OW20N, SYNCN, LRCI,
TMOD1, TMOD2

3. Pins CKO, DOL, DOR, BCKO, WCKO

= 0 V, T

SS

= − 20 to 80 ° C

a

Rating

Unit

min typ max

DD

IH1

IL1

INAC

2

2

3

3

2

2

V

IH2

V

IL2

V

OH

V

OL

IH

IL1

I

IL2

I

LH

V

DD

I

OH

I

OL

V

IN

V

IN

V

IN

V

IN

1

= 5.0 V

= − 0.4 mA 2.5 – – V
= 1.6 mA – – 0.4 V
= V

DD

= 0 V – 10 20 µA
= 0 V – 10 20 µA
= V

DD

–5065mA

0.7V

DD

– – 0.3V

0.3V

DD

––V

DD

––V

V

p-p

2.4 – – V
– – 0.5 V

–1020µA

– – 1.0 µA

NIPPON PRECISION CIRCUITS—6

AC Electrical Characteristics

Input Clock (XTI)

Crystal oscillator

SM5843A × 1

fs = 384fs (CKSLN = HIGH): V

Parameter Symbol

Oscillator frequency f

fs = 256fs (CKSLN = LOW): V

Parameter Symbol

Oscillator frequency f

= 4.5 to 5.5 V, V

DD

= 4.75 to 5.25 V, V

DD

External clock input

fs = 384fs (CKSLN = HIGH): V

Parameter Symbol

Clock HIGH-level pulsewidth t
Clock LOW-level pulsewidth t
Clock pulse cycle time t

= 4.5 to 5.5 V, V

DD

OSC

OSC

CWH

CWL

XI

= 0 V, T

SS

= 0 V, T

SS

= 0 V, T

SS

= − 20 to 80 ° C

a

Rating

min typ max

2.0 – 21.2 MHz

= − 20 to 70 ° C

a

Rating

min typ max

1.0 – 14.2 MHz

= −20 to 80 °C

a

Rating

min typ max

20 – 250 ns
20 – 250 ns
47 – 500 ns

Unit

Unit

Unit

fs = 256fs (CKSLN = LOW): VDD = 4.75 to 5.25 V, VSS = 0 V, Ta = −20 to 70 °C

Parameter Symbol

Clock HIGH-level pulsewidth t
Clock LOW-level pulsewidth t
Clock pulse cycle time t

XTI

tCWH

CWH

CWL

XI

min typ max

30 – 500 ns
30 – 500 ns
70 – 1000 ns

tCWL

Rating

VlH1

0.5VDD
VlL1

tXI

Unit

NIPPON PRECISION CIRCUITS—7

Serial input timing (BCKI, DI, DIL, DIR, LRCI)

VDD = 4.5 to 5.5 V, VSS = 0 V, Ta = −20 to 80 °C

SM5843A×1

Parameter Symbol

BCKI HIGH-level pulsewidth t
BCKI LOW-level pulsewidth t
BCKI pulse cycle t
DIN setup time t
DIN hold time t
Last BCKI rising edge to LRCI edge t
LRCI edge to first BCKI rising edge t

BCKI

DI
DIL
DIR

BCWH

BCWL

BCY

DS

DH

BL

LB

tDS

Rating

min typ max

50 – – ns
50 – – ns

100 – – ns

50 – – ns
50 – – ns
50 – – ns
50 – – ns

Unit

tBCY

tBCWH

tBCWL

1.5V

tDH

1.5V

LRCI

Reset timing (RSTN)

VDD = 4.5 to 5.5 V, VSS = 0 V, Ta = −20 to 80 °C

Parameter Symbol Condition

RST

LOW-level reset pulsewidth t

RST

At power-ON 1 – – µs
At all other times 50 – – ns

tBL

Rating

min typ max

tLB

1.5V

Unit

NIPPON PRECISION CIRCUITS—8