SILAN SC7313S, SC7313 Datasheet

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Semiconductors

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DIGITAL CONTROLLED STEREO
AUDIO PROCESSOR WITH LOUDNESS

DESCRIPTION

The SC7313 is a volume, tone (bass and treble), balance (left/

right) and fader(front/rear) processor for quality audio applications in

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L

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R

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in and external

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SC7313

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car radio and Hi-Fi systems. Selectable input g
loudness function are provided. Control is accomplished by serial

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C bus microprocessor interface. The AC signal settings is obtained

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by resistor networks and switches combined with operational
amplifiers. Due to the Used BIPOLAR/CMOS technology, low
distortion, low noise andlow DC stepping are obtained.

FEATURES

* Input multiplexer:

--3 stereo inputs

--Selectable input gain for optimal adaptation to different
sources

* Four speaker attenuators:

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--4 independent speakers control in 1.25dB steps for

balance and fader facilities

--Independent mute function

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* All functions programmable via serial I

CBus

PIN CONFIGURATIONS

C

REF

DD

V

GND

TREBLE

IN(R)

OUT(R)

LOUD R

LEFT

R3
R2
R1

LOUD L

L3
L2

RIGHT

INPUTS

INPUTS

SC7313

SOP-28

DIP-28

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ORDERING INFORMATION

Device Package

SC7313 DIP-28-600-2.54

SC7313S SOP-28-375-1.27

* Loudness function
* Volume control in 1.25dB steps
* Treble and bass control
* Input and output for external equalizer or

noise reduction system

SCL
SDA
DIG GND
OUT LF
OUT RF
OUT LR
OUT RR
BOUT(R)
BIN(R)
BOUT(L)
BIN(L)
OUT(L)
IN(L)
L1

BUS

INPUTS

BASS

) LEFT INPUTS

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HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.1 2002.02.26

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Semiconductors

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BLOCK DIAGRAM

B-OUT

(L)

(L)

(L)

BASS TREBLE

SERIALBUS DECODER +LATCHES

BASS TREBLE

B-IN

LOUDNESS

B-OUT

(R)

(R)

(R)

(L)

TREBLE

(R)

SPEAKER

ATT

MUTE

SPEAKER

ATT

MUTE

LEFT

INPUTS

RIGHT

INPUTS

CREF

INPUT SELECTION
& GAIN C ONTROL

15

14

13

9

10

11

SUPPLY1

2 3

VDD A-GND

LOUDNESS

IN

OUT

(L)

(L)

17 16 12 19 18 4

VOLUME

&LOUDNESS

VOLUME

&LOUDNESS

7 6 8 21 20 5

IN

OUT

(R)

(R)

TREBLE

B-IN

ABSOLUTE MAXIMUM RATINGS

Characteristic Symbol Value Unit

Supply Voltage V

S

10.2 V
Operating Temperature Tamb -40~ +85
Storage Temperature Tstg -55 ~ +150

QUICK REFERENCE DATA

Characteristic Symbol Min. Typ. Max. Unit

Supply Voltage Vs 6 9 10 V
Maximum input signal handling V

CL

Total harmonic distortion ,V=1Vrms, f=1kHz THD 0.01 0.1 %
Signal to noise ratio S/N 106 dB
Channel separation, f=1kHz Sc 103 dB
Volume control, 1.25dB step -78.75 0 dB
Bass and treble control, 2dB step -14 +14 dB
Fader and balance control, 1.25dB step -38.75 0 dB
Input gain, 3.75dB step 0 11.25 dB
Mute attenuation 100 dB

2Vrms

SC7313

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SPEAKER

ATT

MUTE

SPEAKER

ATT

MUTE

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27

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24

22

LEFT

FRONT

OUT

LEFT

REAR

OUT

SCL

SDA

DIG-GND

RIGHT

FRONT

OUT

RIGHT

REAR

OUT

°C
°C

BUS

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.1 2002.02.26

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Semiconductors

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ELECTRICAL CHARACTERISTICS

(Refer to the test circuit)

(Tamb=25°CVS=9.0V,RL=10kΩRG=600Ωall controls flat(G=0), f=1kHz,Unless otherwise specified)

Parameter Symbol Test conditions Min Typ Max Unit

SUPPLY VOLTAGE

Operating Supply Voltage V
Operating Supply Current I

S

S

Ripple rejection of Supply Voltage SVR 60 80 dB

INPUTS SELECTORS

Input resistance R
Clipping Level V
Input Separation (note 2) S
Output load resistance R
Minimum input Gain G
Maximum input gain G

IN(MIN)

IN(MAX)

Step resolution G
Input noise e

DC steps V

Input 1,2,3 35 50 70

II

CL

IN

Pin7,17 4

L

STEP

G=11.25dB 2

IN

Adjacent gain steps 4 20 mV

DC

G=18.75 to MUTE 4 mV

VOLUME CONTROL

Input resistance R

IV

Control range Crange 70 75 80 dB
Minimum attenuation A
Maximum attenuation A
Step resolution A

Attenuation set error E

Tracking error E

DC steps V

V(min)

V(max)

STEP

A

T

DC

AV=0 to –20dB -1.25 0 1.25
AV=-20 to –60dB -3 2

Adjacent attenuation steps 0 3 mV
From 0dB to AVmax 0.5 7.5 mV

SPEAKER ATTENUATORS

Control Range Crange 35 37.5 40 dB
Step resolution S
Attenuation Set error E
Output Mute Attenuation A

DC steps V

STEP

A

MUTE

Adjacent attenuation steps 0 3 mV

DC

From 0dB to MUTE 1 10 mV

0.5 1.25 1.75 dB

0.5 1.25 1.75 dB

SC7313

6 9 10.0 V

20.0 35.0 mA

kΩ

22.5 Vrms

80 100 dB

kΩ

-1 0 1 dB

11.25 dB

3.75 dB
µV

20 33 50

-1 0 1 dB

70 75 80 dB

80 100 dB

kΩ

dB

2dB

1.5 dB

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.1 2002.02.26

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Semiconductors

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(continued)

Parameter Symbol Test conditions Min Typ Max Unit

BASS CONTROL (note 1)

Control Range G
Step resolution B
Internal feedback resistance R

TREBLE CONTROL (note 1)

Control Range Gt Maximum boost/cut
Step resolution T

AUDIO OUTPUTS

Clipping level V
Output load resistance R
Output load capacitance C
Output resistance R
DC voltage level V

GENERAL

Output noise e

Signal to noise ratio S/N All gains=0dB; Vo=1Vrms 106 dB

Distortion d

Channel separation left/right Sc 80 103 dB

Total tracking error

BUS INPUTS

Input low voltage V
Input high voltage V
Input current I
Output voltage SDA acknowledge Vo Io=1.6mA 0.4 V
NOTES:
(1) Bass and treble response see Figure 16. The center frequency and quality of the response behavior can be

chosen by the external circuitry. A standard first order bass response can realized by a standard feedback
network.

(2) The selected input is grounded through the 2.2µF capacitor.

Maximum boost/cut

B

STEP

B

STEP

THD=0.3% 2 2.5 Vrms

OCL

L

L
OUT
OUT

BW=20 ~20kHz,flat
output muted

NO

BW=20 ~20kHz,flat
All gains=0dB
A curve, all gains =0 dB 3

Av=0,VIN=10mV 0.01 0.1 %
Av=-20dB, VIN=1Vrms 0.09 0.3 %
Av=-20dB,V

AV=0 to –20 dB 0 1 dB
AV=-20 to –60 dB 0 2 dB

IL
IH

IN

=0.3Vrms 0.04 %

IN

±12 ±14 ±16

±13 ±14 ±15

4.2 4.5 4.8 V

SC7313

dB

123dB

34 44 58

123dB

4

30 75 120

2.5

515

3V

-5 +5

kΩ

dB

kΩ

10 nF

Ω

µV

µV

µV

1V

µA

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.1 2002.02.26

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