NPC SM5841HS, SM5841HP Datasheet

SM5841H

NIPPON PRECISION CIRCUITS INC.

Audio Multi-function Digital Filter

OVERVIEW

The SM5841H is an 8-times oversampling (interpo­lation) digital filter for digital audio reproduction
equipment. It accepts 16 or 18-bit input data, and
outputs data in 16, 18 or 20-bit format, making a
wide range of interfaces possible. It also features
digital deemphasis for 3 sampling frequencies, a
noise shaper to reduce quantization noise, a DC off­set output and other circuits.

FEATURES

Functions

■

2-channel processing

■

8-times (8fs) oversampling (interpolation)

■

Digital deemphasis (fs = 48/44.1/32 kHz)

■

Serial input data
2s complement, MSB first, 16/18-bit

■

Serial output data
2s complement, MSB first, 16/18/20-bit

■

1st-order noise shaper (for 16/18-bit output only)

■

256fs/384fs system clock selectable

■

Output data DC offset (approximately 0.8%)
ON/OFF control

■

TTL-compatible input/outputs

■

5 V (standard) supply

■

3.2 V operating voltage

■

Molybdenum-gate CMOS

ORDERING INFOMATION

Device Package

SM5841HP 18pin DIP
SM5841HS 22pin SOP

Filter Characteristics

■

3-stage DC FIR interpolation filter
1st stage (fs → 2fs), 69-tap
2nd stage (2fs → 4fs), 13-tap
3rd stage (4fs → 8fs), 9-tap

■

IIR deemphasis filter for gain and phase character­istics close to those of analog filters

■

Overflow limiter built-in

APPLICATIONS

■

Digital amplifiers

■

CD players

■

DAT players

■

DBS systems

■

PCM systems

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SM5841H

PINOUT

18-pin DIP

22-pin SOP

WSL1

CKSL

CKO

WSL2

DSF1
DSF2

WSL1

CKI

CKSL

CKO

VSS

(NC)

(NC)

WSL2

DSF1
DSF2

RST

CKI

VSS

RST

PACKAGE DIMENSIONS

18-pin DIP (Unit: mm)

DIN

1
2
3

SM5841HP

4
5
6
7
8
9

1
2
3
4

SM5841HS

5
6
7
8

9
10
11

18
17

BCKI
LRCI

16

OFST

15
14

VDD

WCKO

13

DOL

12

DOR

11

BCKO

10

1.27MAX 2.54TYP

1.20

22.05

+ 0.30

− 0

+ 0.20

− 0.30

0.45

+ 0.14

− 0.05

6.20 0.25

0.51MIN

7.62TYP

5.00MAX

3.00MIN

015

0.25 0.05

22-pin SOP (Unit: mm)

DIN

22

BCKI

21

LRCI

20

OFST

19

(NC)

18

(NC)

17

VDD

16

WCKO

15

DOL

14

DOR

13

BCKO

12

0.4 ± 0.1

13.9 ± 0.3

1.27

5.4 ± 0.2

7.8 ± 0.3

0.05 ± 0.05

1.8 ± 0.1

+ 0.1

0.15 − 0.05

0.5 ± 0.2

0 to 10˚

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BLOCK DIAGRAM

SM5841H

LRCI BCKIDIN

CKSL

CKI

CKO

RST

DSF1
DSF2

WSL1
WSL2

PIN DESCRIPTION

SOP DIP Name I/O

1 1 WSL1 Ip

8 6 WSL2 Ip

System

Clock

Timing

Controller

Deemphasis

Controler

Input/output

word length

selector

VSS

1

Input/output data select pins

WSL1 WSL2 Noise shaper Input bit length Output bit length

HIGH HIGH Off 18 bits 20 bits
HIGH LOW On 18 bits 18 bits
LOW HIGH On 16 bits 18 bits
LOW LOW On 16 bits 16 bits

VDD

Input data Interface

Filter and Attenuation

Airthmetic block

Interface

Output date

Description

OFST

WCKO

DOL
DOR
BCKO

2 2 CKI Ip System clock input
3 3 CKSL
4 4 CKO O System clock output. The CKI is first buffered before output on CKO.
5 5 VSS – Ground
6 – NC – No connection
7 – NC – No connection

9 7 DSF1 Ip

10 8 DSF2 Ip

11 9 RST
12 10 BCKO O Output bit clock

Ip System clock select input. 384fs when HIGH, and 256fs when LOW.

Deemphasis select inputs

DSF1 DSF2 Deemphasis Sampling frequency

LOW LOW On 44.1 kHz

LOW HIGH On 48.0 kHz
HIGH LOW Off –
HIGH HIGH On 32.0 kHz

Ip System reset. Reset and initialization when RST is LOW.

NIPPON PRECISION CIRCUITS—3

−

−

+

−

°

°

−

° C

SM5841H

SOP DIP Name I/O

13 11 DOR O Right-channel 8fs data output
14 12 DOL O Left-channel 8fs data output
15 13 WCKO O Output word clock
16 14 VDD – 5 V supply
17 – NC – No connection
18 – NC – No connection
19 15 OFST Ip Output data DC offset select input. Summing ON when HIGH, and OFF when LOW.
20 16 LRCI Ip Input data sample rate (fs) clock
21 17 BCKI Ip Input bit clock
22 18 DIN Ip Input data

1. Ip = Input with pull-up resistor

1

Description

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

DD

IN

stg

D

sld

sld

0.3 to 7.0 V

0.3 to V

0.3 V

DD

40 to 125

250 mW
255

10 s

C

C

Recommended Operating Conditions

V

= 0 V

SS

Parameter Symbol Rating Unit

Supply voltage range V
Operating temperature range T

DD

opr

3.2 to 5.5 V
20 to 80

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DC Electrical Characteristics

SM5841H

Standard voltage: V

= 4.5 to 5.5 V, V

DD

= 0 V, T

SS

Parameter Symbol Condition

Current consumption I
HIGH-level input voltage
LOW-level input voltage

2

2

CKI AC-coupled input voltage V
HIGH-level input voltage
LOW-level input voltage
HIGH-level output voltage
LOW-level output voltage

3

3

4

4

CKI HIGH-level input current I
CKI LOW-level input current I
LOW-level input current
Input leakage current
Input leakage current

1. f

= 384fs = 20 MHz, no output load

SYS

2. Pins CKSL

3

2, 3

2

, OFST

V
V

INAC

V
V
V

V

I
I

DD

IH1

IL1

IL2

LH

I

IH1

IL1

IH2

IL2

OH

OL

LL

3. Pins LRCI, DIN, BCKI, DSF1, DSF2, WSL1, WSL2, RST

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

= − 20 to 80 ° C

a

Rating

min typ max

= 5.0 V

1

––40mA

0.7V

DD

– – 0.3V

DD

––V

DD

––V

V

DD

Sine wave input 0.3V

2.4 – – V
– – 0.5 V

I

= − 0.4 mA 2.5 – – V

OH

I

= 1.6 mA – – 0.4 V

OL

V

= V

IN

DD

V

= 0 V – 10 20 µA

IN

V

= 0 V – 10 20 µA

IN

V

= V

IN

DD

V

= 0 V – – 1.0 µA

IN

–1020µA

– – 1.0 µA

Unit

V

p-p

Low voltage: V

= 3.2 to 4.5 V, V

DD

= 0 V, T

SS

Parameter Symbol Condition

Current consumption I
HIGH-level input voltage
LOW-level input voltage

2

2

CKI AC-coupled input voltage V
HIGH-level input voltage
LOW-level input voltage
HIGH-level output voltage
LOW-level output voltage

3

3

4

4

CKI HIGH-level input current I
CKI LOW-level input current I
LOW-level input current
Input leakage current
Input leakage current

1. f

= 384fs = 18.5 MHz, no output load

SYS

2. Pins CKSL, OFST

3

2, 3

2

V
V

INAC

V
V
V

V

I
I

DD

IH1

IL1

IL2

LH

I

IH1

IL1

IH2

IL2

OH

OL

LL

3. Pins LRCI, DIN, BCKI, DSF1, DSF2, WSL1, WSL2, RST

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

= − 20 to 80 ° C

a

Rating

min typ max

= 3.4 V

1

––20mA

0.7V

DD

– – 0.3V

DD

––V

DD

––V

V

DD

Sine wave input 0.3V

2.4 – – V
– – 0.5 V

I

= − 0.2 mA 2.5 – – V

OH

I

= 0.8 mA – – 0.4 V

OL

V

= V

IN

DD

V

= 0 V – – 12 µA

IN

V

= 0 V – – 12 µA

IN

V

= V

IN

DD

V

= 0 V – – 1.0 µA

IN

––12µA

– – 1.0 µA

Unit

V

p-p

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AC Electrical Characteristics

Clock (CKI)

Standard voltage: V

Parameter Symbol

HIGH-level clock pulsewidth t

LOW-level clock pulsewidth t

Clock pulse cycle t

= 4.5 to 5.5 V, V

DD

CWH

CWL

CI

SM5841H

= 0 V, T

SS

CKSL

HIGH 384fs 23 – 250

LOW 256fs 35 – 500

HIGH 384fs 23 – 250

LOW 256fs 35 – 500

HIGH 384fs 50 – 500

LOW 256fs 76 – 1000

= −20 to 80 °C

a

Condition Rating

System

clock

min typ max

Unit

ns

ns

ns

Low voltage: VDD = 3.2 to 4.5 V, VSS = 0 V, Ta = −20 to 80 °C

Condition Rating

Parameter Symbol

HIGH-level clock pulsewidth t

LOW-level clock pulsewidth t

Clock pulse cycle t

CWH

CWL

CI

CKSL

HIGH 384fs 25 – 250

LOW 256fs 50 – 500

HIGH 384fs 25 – 250

LOW 256fs 50 – 500

HIGH 384fs 54 – 500

LOW 256fs 108 – 1000

System

clock

CKI

tCWH

tCWL

tCI

min typ max

over

DD

0.7×V

0.5×V

DD

under

0.3×V

DD

Unit

ns

ns

ns

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