NPC SM5846AP Datasheet

SM5846AP

NIPPON PRECISION CIRCUITS INC.

OVERVIEW

The SM5846AP is a multi-function digital filter that
incorporates 4/8 times oversampling digital audio
signal reproduction, digital deemphasis, digital
attenuation and soft mute functions. The I/O inter­face allows serial data transmission of 16/20/24/32­bit input data and 20/24-bit output data.

FEATURES

Functions

■

8-times oversampling (interpolation)

■

Switchable 8/4 times oversampling output

■

Two master clock frequencies
(refer to Clock Functions)

• 384fs/512fs (normal-speed sampling)

• 192fs/256fs (high-speed sampling)
Digital deemphasis

■

• Compatible with 32/44.1/48 kHz (normal­speed) and 64/88.2/96 kHz (high-speed) input
sampling frequencies

• ON/OFF control

Digital attenuator

■

• 128-step attenuation using linear 7-bit data set­ting

Soft muting

■

• 1016/fs (normal-speed sampling)

• 2032/fs (high-speed sampling)

Output data round-off operation (normal round-off

■

or rectangular distribution dither round-off)
Selectable LR clock polarity

■

Microprocessor controllable

■

Input data format

■

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

• 16/20/24/32-bit data selectable

Output data format

■

• 2s complement, MSB first, simultaneous L/R
serial

• 20/24-bit data selectable.

24-bit internal data processing

■

Jitter-free mode/synchronous mode selectable

■

Crystal oscillator circuit built-in

■

TTL-compatible outputs

■

Molybdenum-gate CMOS

■

Multi-function Digital Filter

Filter Construction

Interpolation filter (linear 3-stage FIR filter)

■

• Normal-speed sampling mode
1st stage (fs to 2fs) 121st order
2nd stage (2fs to 4fs) 21st order
3rd stage (4fs to 8fs) 13th order

• High-speed sampling mode:
1st stage (fs to 2fs) 177th order
2nd stage (2fs to 4fs) 29th order
3rd stage (4fs to 8fs) 17th order

■

Deemphasis filter (IIR filter)

■

Arithmetic units

•25 × 24-bit parallel adder

• 32-bit accumulator

■

Overflow limiter built-in

Applications

■

Digital audio equipment

PINOUT

ASEL2/MDCK

SYNC/MDLE

ORDERING INFOMATION

(TOP VIEW)

1

DIN

2

BCKI

3

VDD1

4

DITH

CKEN

5
6

XTI

7

XTO

8

VSS1

CKO

9

CKS

10
11

HS/MDT

SM5846AP 28pin DIP

12
13

RST

14

Device Package

SM5846AP

28
27
26
25

24
23

22
21
20
19
18
17
16
15

LRCI
MDS
BCKO
WCKO

DOL

DOR

VDD2

VSS2
ASEL1

OBS

TEST2

TEST1

DEEM

LRS

Audio
ICs

NIPPON PRECISION CIRCUITS—1

PACKAGE DIMENSIONS

Unit: mm

SM5846AP

28-pin plastic DIP

3.8 0.1

2.54

37.3 0.3

0.45 0.1

1.5

+

−

0.3

0.05

13.8 0.2

4.5 0.3

3.2 0.2

3.2 0.2

7.7 0.5

15.2

+

0.10

0.25

0.05

−

Audio
ICs

0° to 15°

NIPPON PRECISION CIRCUITS—2

≥

SM5846AP

FILTER CHARACTERISTICS

Normal-speed Sampling

Parameter Rating

Passband bandwidth 0 to 0.4535fs
Stopband bandwidth 0.5465 to 7.4535fs
Passband ripple ±0.0004 dB
Stopband attenuation

Group delay time

1

When CKS is HIGH: 63.89/fs (when SYNC is LOW) and 63.51/fs to 64.26/fs (when SYNC is HIGH)
When CKS is LOW: 63.76/fs (when SYNC is LOW) and 63.59/fs to 64.14/fs (when SYNC is HIGH)

1. The time difference due to digital filter operation between the end of serial data input (at rate fs) and the start of serial data output (at rate 8fs).

Overall frequency characteristic

0

75 dB

Audio
ICs

20

40

(dB)

60

80

100

Attenuation

120

140

0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0

Passband frequency characteristic

-0.0005

-0.00025

0.00000

0.00025

Attenuation (dB)

0.0005

0.000 0.125 0.250 0.375 0.500

Frequency

Frequency

(fs)

(fs)

Transition band characteristic

0

20

40

(dB)

60

80

100

Attenuation

120

140

0.00 0.125 0.25 0.375 0.50 0.625 0.75 0.825 1.00

Frequency

(fs)

NIPPON PRECISION CIRCUITS—3

≥

SM5846AP

High-speed Sampling (8fs Output)

Parameter Rating

Passband bandwidth 0 to 0.4535fs
Stopband bandwidth 0.5465 to 7.4535fs
Passband ripple ±0.00001 dB
Stopband attenuation

Group delay time

1

When CKS is HIGH: 51.91/fs (when SYNC is LOW) and 51.53/fs to 52.28/fs (when SYNC is HIGH)
When CKS is LOW: 51.78/fs (when SYNC is LOW) and 51.40/fs to 52.15/fs (when SYNC is HIGH)

1. The time difference due to digital filter operation between the end of serial data input (at rate fs) and the start of serial data output (at rate 8fs).

Overall frequency characteristic

0

20

105 dB

Audio
ICs

40

(dB)

60

80

100

Attenuation

120

140

0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0

Passband frequency characteristic

-0.0001

-0.00005

(dB)

0.00000

0.00005

Attenuation

0.0001

0.000 0.125 0.250 0.375 0.500

Transition band characteristic

Frequency

Frequency

(fs)

(fs)

0

20

40

(dB)

60

80

100

Attenuation

120

140

0.00 0.125 0.25 0.375 0.50 0.625 0.75 0.825 1.00

Frequency

(fs)

NIPPON PRECISION CIRCUITS—4

≥

SM5846AP

High-speed Sampling (4fs Output)

Parameter Rating

Passband bandwidth 0 to 0.4535fs
Stopband bandwidth 0.5465 to 7.4535fs
Passband ripple ±0.00001 dB
Stopband attenuation

Group delay time

1

When CKS is HIGH: 50.78/fs (when SYNC is LOW) and 50.40/fs to 51.15/fs (when SYNC is HIGH)
When CKS is LOW: 50.77/fs (when SYNC is LOW) and 50.40/fs to 51.15/fs (when SYNC is HIGH)

1. The time difference due to digital filter operation between the end of serial data input (at rate fs) and the start of serial data output (at rate 8fs).

Overall frequency characteristic

0

104 dB

Audio
ICs

20

40

(dB)

60

80

Attenuation

100

120

140

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0

Passband frequency characteristic

-0.0001

-0.00005

(dB)

0.00000

0.00005

Attenuation

0.0001

0.000 0.125 0.250 0.375 0.500

Frequency

Frequency

(fs)

(fs)

Transition band characteristic

0

20

40

(dB)

60

80

100

Attenuation

120

140

0.125 0.25 0.375 0.50 0.625 0.75 0.825 1.00

Frequency

(fs)

NIPPON PRECISION CIRCUITS—5

SM5846AP

Deemphasis Filter Characteristics (Normal-speed Sampling)

Parameter Rating

Sampling frequency (fs) 32 kHz 44.1 kHz 48 kHz
Passband bandwidth 0 to 14.5 kHz 0 to 20.0 kHz 0 to 21.7 kHz

Deviation from ideal
characteristics

Deemphasis passband characteristic (logarithmic scale)

The phase traces are from top to bottom fs = 32/44.1/48 kHz, respectively.

Attenuation ±0.01 dB
Phase 0 to 6

°

Audio
ICs

0

2

4

6

8

Attenuation (dB)

10

10 20 50 100 200 500 1k 2k 5k 10k 20k

Frequency (Hz)

Deemphasis passband characteristic (linear scale)

The phase traces are from top to bottom fs = 32/44.1/48 kHz, respectively.

0

2

Phase

Attenuation

Phase

0

-20

-40

Phase θ ( ° )

-60

0

-20

4

6

Attenuation (dB)

8

Attenuation

10

0 4k 8k 12k 16k 20k 22k 24k

Frequency (Hz)

NIPPON PRECISION CIRCUITS—6

-40

Phase θ ( ° )

-60

SM5846AP

Deemphasis Filter Characteristics (High-speed Sampling)

Parameter Rating

Sampling frequency (fs) 64 kHz 88.2 kHz 96 kHz
Passband bandwidth 0 to 29.0 kHz 0 to 40.0 kHz 0 to 43.5 kHz

Deviation from ideal
characteristics

Deemphasis passband characteristic (logarithmic scale)

The phase traces are from top to bottom fs = 64/88.2/96 kHz, respectively.

Attenuation ±0.001 dB
Phase 0 to 1

°

Audio
ICs

0

2

4

6

Attenuation (dB)

8

10

10 20 50 100 200 500 1k 2k 5k 10k 20k

Frequency (Hz)

Deemphasis passband characteristic (linear scale)

The phase traces are from top to bottom fs = 64/88.2/96 kHz, respectively.

0

2

Phase

Attenuation

Phase

0

-20

-40

Phase θ ( ° )

-60

0

-20

4

6

8

Attenuation (dB)

10

0 4k 8k 12k 16k 20k 22k 24k

Frequency (Hz)

Attenuation

NIPPON PRECISION CIRCUITS—7

-40

-60

Phase θ ( ° )

SM5846AP

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

Recommended Operating Conditions

−

−

+

−

°

°

−

° C

−

Audio
ICs

DD

IN

stg

D

sld

sld

0.3 to 7.0 V

0.3 to V

0.3 V

DD

40 to 125

750 mW
255

10 s

C

C

V

= 0 V

SS

Parameter Symbol Rating Unit

Supply voltage range V
Operating temperature range T

DC Electrical Characteristics

V

= 4.5 to 5.5 V, V

DD

Parameter Symbol Condition

Supply current consumption
HIGH-level input voltage V
LOW-level input voltage V
XTI AC-coupled input voltage V
HIGH-level output voltage V
LOW-level output voltage V
XTI HIGH-level input current I
XTI LOW-level input current I

LOW-level input current I

Input leakage current I

1. V

= 5.0 V , f

DD

= 18.432 MHz, 384fs operation, no output load.

sys

= 0 V, T

SS

1

= − 20 to 70 ° C

a

I

DD

IH

IL

INAC

OH

OL

IH

IL

IL

LH

All inputs 0.7V
All inputs – – 0.3V

All outputs, I
All outputs, I
V

= V

IN

DD

V

= V

IN

SS

Inputs excluding XTI,
V

= V

IN

SS

Inputs excluding XTI,
V

= DV

IN

DD

opr

4.5 to 5.5 V
20 to 70

Rating

min typ max

– 110 130 mA

DD

0.3V

DD

= − 1 mA V

OH

= 2 mA – – 0.4 V

OL

0.4 – – V

DD

––V

DD

––V

–1020µA
–1020µA

–1020µA

DD

– – 1.0 µA

Unit

V

p-p

NIPPON PRECISION CIRCUITS—8

AC Characteristics

XTI input timing

SM5846AP

VDD = 4.5 to 5.5 V, VSS = 0 V, Ta = −20 to 70 °C

Parameter Symbol Condition

Oscillator frequency f
XTI clock pulse cycle time t
XTI HIGH-level clock pulsewidth t
XTI LOW-level clock pulsewidth t

OSC

XI

CWH

CWL

XTI

tCHW tCHW

tXI

RST input timing

VDD = 4.5 to 5.5 V, VSS = 0 V, Ta = −20 to 70 °C

Parameter Symbol Condition

Reset pulsewidth t

RST

When power is applied 1 – – µs
At all other times 50 – – ns

Audio
ICs

Rating

Unit

min typ max

10 – 18.5 MHz
54 – – ns
24 – – ns
24 – – ns

0.5VDD

Rating

Unit

min typ max

RST

0.5VDD

tRST

NIPPON PRECISION CIRCUITS—9

Serial data input timing (BCKI, DIN, LRCI)

VDD = 4.5 to 5.5 V, VSS = 0 V, Ta = −20 to 70 °C

SM5846AP

Parameter Symbol Condition

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

BCKI

DIN

BCY

BCWH

BCWL

DS

DH

BL

LB

tDS

VALID

VALID

VALID

tBCY

tBCWH tBCWL

tDH

Rating

Unit

min typ max

100 – – ns

50 – – ns
50 – – ns
20 – – ns
20 – – ns
50 – – ns
50 – – ns

0.5VDD

0.5VDD

Audio
ICs

LRCI

tBL

tLB

0.5VDD

NIPPON PRECISION CIRCUITS—10

SM5846AP

Microprocessor serial interface timing (MDCK, MDT, MDLE)

VDD = 4.5 to 5.5 V, VSS = 0 V, Ta = −20 to 70 °C

Parameter Symbol Condition

MDCK pulse cycle time t
MDCK HIGH-level pulsewidth t
MDCK LOW-level pulsewidth t
MDT setup time t
MDT hold time t
MDCK rising edge to MDLE edge

time
MDLE edge to MDCK rising edge

time
MDLE HIGH-level pulsewidth t
MDLE LOW-level pulsewidth t

MDCK

MCY

MCWH

MCWL

MDS

MDH

t

MCL

t

MLC

MLWH

MLWL

tMCWH

tMCY

Rating

Unit

min typ max

100 – – ns

50 – – ns
50 – – ns
20 – – ns
20 – – ns

50 – – ns

50 – – ns

20 – – ns
20 – – ns

tMCWL

0.5VDD

Audio
ICs

MDLE

tMDS tMDH

tMCL

tMCL

tMLWL tMLWH

0.5VDDMDT

0.5VDD

NIPPON PRECISION CIRCUITS—11