Document
SC7312
4-CH OUTPUT STEREO AUDIO PROCESSOR WITH 4 STEREO INPUTS AND TONE/VOLUME CONTROL
DESCRIPTION
The SC7312 is a volume, tone (bass and treble), balance (left/ right) and fader(front/rear) processor for quality audio applications in car radio and Hi-Fi systems. Selectable input gain and external loudness function are provided. Control is accomplished by serial I2C bus microprocessor interface. The AC signal settings is obtained by resistor networks and switches combined with operational amplifiers. Due to the Used CMOS technology, low distortion, low noise and low DC stepping are obtained.
SOP-32-375-1.27
FEATURES
* Input multiplexer: --4 stereo inputs --Selectable input gain for optimal adaptation to different sources * Four speaker attenuators: --4 independent speakers control in 1.25dB steps for balance and fader facilities --Independent mute function * All functions programmable via serial I 2C Bus * Loudness function * Volume control in 1.25dB steps * Treble and bass control * Input and output for external equalizer or noise reduction system
ORDERING INFORMATION
Device SC7312S Package SOP-32-375-1.27
BLOCK DIAGRAM
www.DataSheet4U.com
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.2
2004.08.03 Page 1 of 13
SC7312
ABSOLUTE MAXIMUM RATINGS
Characteristics Supply Voltages Operating Temperature Storage Temperature Symbol VS Tamb Tstg Ratings 10.2 -40 ~ +85 -55 ~ +150 Unit V °C °C
QUICK REFERENCE DATA
Characteristics Supply Voltage Maximum Input Signal Handling Total Harmonic Distortion ,V=1Vrms, f=1kHz Signal to Noise Ratio Channel Separation, f=1kHz Volume Control, 1.25dB step Bass and Treble Control, 2dB step Fader and Balance Control, 1.25dB step Input Gain, 3.75dB Step Mute Attenuation 0 100 11.25 dB dB S/N Sc -78.75 -14 -38.75 106 103 0 +14 0 dB dB dB dB dB Symbol Vs VCL THD Min. 6 2 0.01 0.1 Typ. 9 Max. 10 Unit V Vrms %
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) Characteristics SUPPLY VOLTAGE www.DataSheet4U.com Operating Supply Voltage Operating Supply Current Ripple Rejection of Supply Voltage INPUTS SELECTORS Input Resistance Clipping Level Input Separation (note 2) Output Load Resistance Minimum Input Gain Maximum Input gain Step Resolution Input Noise DC Steps RII VCL SIN RL GIN(MIN) GIN(MAX) GSTEP eIN VDC G=11.25dB Adjacent gain steps G=18.75 to MUTE Pin 8, 21 Input 1, 2, 3, 4 35 2 80 4 -1 0 11.25 3.75 2 4 4 20 1 50 2.5 100 70 kΩ Vrms dB kΩ dB dB dB µV mV mV
(To be continued)
Symbol VS IS SVR
Test conditions
Min. 6
Typ. 9 20.0
Max. 10.0 35.0
Unit V mA dB
60
80
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.2
2004.08.03 Page 2 of 13
SC7312
(Continued)
Characteristics VOLUME CONTROL Input Resistance Control Range Minimum Attenuation Maximum Attenuation Step Resolution Attenuation Set Error Tracking Error DC Steps SPEAKER ATTENUATORS Control Range Step Resolutio.