NPC SM5852CS Datasheet

SM5852CS

NIPPON PRECISION CIRCUITS—1

NIPPON PRECISION CIRCUITS INC.

Dynamic Range Compression LSI

OVERVIEW

The SM5852CS is a digital signal processor IC that
performs dynamic range compression for use in
digital audio reproduction equipment. It is designed
for use with a 44.1 kHz sampling frequency.

FEATURES

■

2-channel processing

■

6 input-level dependent dynamic gain
characteristics

■

Dynamic range compression bypass mode

■

2 attack time settings

■

Soft muting function

■

Serial input/output interface
2s complement, MSB first, 16-bit

■

384fs system clock

■

23 × 23-bit multiplier/30-bit high-precision
accumulator

■

TTL-compatible input/output

■

3.2 to 5.5 V operating voltage range

■

16-pin SOP

■

Molybdenum-gate CMOS

ORDERING INFOMATION

PINOUT

PACKAGE DIMENSIONS

16-pin SOP (Unit: mm)

Device Package

SM5852CS 16pin SOP

MUTEN

CLK

VSS

BCKI

DI

LRCI

RSTN

LRCO

VDD

DB/DS

TESTN

MOD2

MOD1
OPT

BCKO

DOUT

1
2
3
4
5
6
7
8

16
15

14
13
12

11
10

9

SM5852CS

10.16±0.3

10.5 MAX

8.0±0.3

5.5±0.3

0.4±0.15

1.27±0.15

0.635±0.15

2.0±0.2

0.1±0.1

0.17±0.05

8.0±0.3

6.8±0.3

0˚ to 15˚

SM5852CS

NIPPON PRECISION CIRCUITS—2

BLOCK DIAGRAM

Input data

Interface

System

Clock

Output data

Interface

Mode Control

Mute

Control

VDD

VSS

LRCO
BCKO
DOUT

Sequence
Control

DSP Block

LRCI

BCKI

DI

CLK

TESTN

MUTEN

DB/DS

OPT

MOD1
MOD2

RSTN

SM5852CS

NIPPON PRECISION CIRCUITS—3

PIN DESCRIPTION

Number Name I/O

1

1. Ip = Input pin with pull-up resistor. Accordingly, they can be left open f or HIGH-level input.

Description

1 LRCI Ip Input data sample rate (fs) clock input
2 BCKI Ip Bit clock input
3 DI Ip Serial data input
4 CLK I Clock inpu t
5 VSS – Ground
6 RSTN Ip System reset initialization. Reset when LOW.
7 TESTN Ip Test mode input. Testing when LOW.
8 MUTEN Ip Mute input. Muting when LOW.

9 DOUT O Serial data output
10 BCKO O Bit clock output
11 LRCO O Output data sample rate (fs) clock output
12 VDD – 3.2 to 5.5 V supply
13 OPT Ip Attack time switch input. Attack-1 when HIGH, and attack-2 when LOW.

14 MOD1 Ip

Gain characteristics switch inputs.

15 MOD2 Ip

16 DB/DS Ip

DB/DS MOD2 MOD1 Compression mode

LOW LOW LOW 6
LOW LOW HIGH 5
LOW HIGH L OW 4
LOW HIGH HIGH Off
HIGH LOW LOW 3
HIGH LOW HIGH 2
HIGH HIGH LOW 1
HIGH HIGH HIGH Off

SM5852CS

NIPPON PRECISION CIRCUITS—4

SPECIFICATIONS

Absolute Maximum Ratings

VSS = 0 V

Recommended Operating Conditions

VSS = 0 V

DC Characteristics

Standard voltage: VDD = 4.5 to 5.5 V, VSS = 0 V, Ta = −35 to 85 °C

Low voltage: VDD = 3.2 to 4.5 V, VSS = 0 V, Ta = −20 to 70 °C

Parameter Symbol Condition Rating Unit

Supply voltage V

DD

−

0.3 to 7.0 V

Input voltage V

IN

VSS − 0.3 to VDD + 0.3 V

Storage temperature T

stg

−

40 to 125

°

C

Power dissipation P

D

250 mW

Soldering temperature T

sld

255

°

C

Soldering time t

sld

10 s

Parameter Symbol Condition Rating Unit

Supply voltage V

DD

3.2 to 5.5 V

Operating temperature T

opr

−

35 to 85

°

C

Parameter Symbol Condition

Rating

Unit

min typ max

Current consumption

1

1. f

CLK

= 384fs = 16.9344 MHz, no output load, input data conformance with NPC test pattern

I

DD

VDD = 5.0 V – 16 23 mA

Input voltage for all inputs

V

IH

2.4 – – V

V

IL

– – 0.5 V

Output voltage for all outputs

V

OH

IOH = −0.4 mA 2.5 – – V

V

OL

IOL = 1.6 mA – – 0.4 V

Input leakage current for all inputs I

LH

VIN = V

DD

– – 1.0 µA

CLK input leakage current I

LL

VIN = 0 V – – 1.0 µA

Input current for all inputs except CLK I

IL

VIN = 0 V – – 20 µA

Parameter Symbol Condition

Rating

Unit

min typ max

Current consumption

1

1. f

CLK

= 384fs = 16.9344 MHz, no output load, input data conformance with NPC test pattern

I

DD

VDD = 3.4 V – 7 10 mA

Input voltage for all inputs

V

IH

2.4 – – V

V

IL

– – 0.5 V

Output voltage for all outputs

V

OH

IOH = −0.2 mA 2.5 – – V

V

OL

IOL = 0.8 mA – – 0.4 V

Input leakage current for all inputs I

LH

VIN = V

DD

– – 1.0 µA

CLK input leakage current I

LL

VIN = 0 V – – 1.0 µA

Input current for all inputs except CLK I

IL

VIN = 0 V – – 12 µA

SM5852CS

NIPPON PRECISION CIRCUITS—5

AC Characteristics

Standard voltage: VDD = 4.5 to 5.5 V, VSS = 0 V, Ta = −35 to 85 °C
Low voltage: VDD = 3.2 to 4.5 V, VSS = 0 V, Ta = −20 to 70 °C

CLK (384fs)

RSTN

RSTN should be set LOW at power-ON and after
reacquiring synchronization. Note that if RSTN is
LOW for longer than 1 µs, a through-current flows in
the internal dynamic circuits because the internal
clock is stopped. The through-current has no rated
value, so the reset pulse should be kept as short as
possible at all times other than at power-ON.

Parameter Symbol Condition

Rating

Unit

min typ max

Clock pulsewidth t

CW

24 – 500 ns

Clock cycle time t

CY

55 59 1000 ns

tcy

tCW

CLK

1.5V

VIH

VIL

tCW

Parameter Symbol Condition

Rating

Unit

min typ max

Reset LOW-level pulsewidth t

RST

At power-ON 1 – – µs
At all other times 50 – 1000 ns

RSTN

1.5V

VDD

tRST

tRST ≥ 1µsec

3.2V

SM5852CS

NIPPON PRECISION CIRCUITS—6

Serial input timing

DB/DS, OPT

When DB/DS or OPT change state, the input level
must be constant for a minimum of 2/fs (2 × LRCI
cycle time). Input levels of duration less than 2/fs
may be ignored.

Parameter Symbol Condition

Rating

Unit

min typ max

BCKI pulsewidth t

BCIW

100 – – ns

BCKI cycle time t

BCIY

200 – – ns

DI setup time t

DIS

75 – – ns

DI hold time t

DIH

75 – – ns

LRCI setup time t

LIS

75 – – ns

LRCI hold time t

LIH

75 – – ns

DI

1.5V

BCKI

LRCI

tBCIW tBCIW

tBCIY

tDIS

tLIS

tLIH

1.5V

1.5V

tDIH

Parameter Symbol Condition

Rating

Unit

min typ max

Minimum pulsewidth t

W

2/fs – – ns