|Category||Multimedia => Audio|
|Description||Tone Control Digitally Controlled Audio Processor|
|Company||ST Microelectronics, Inc.|
|Datasheet||Download TDA7449 datasheet
TONE CONTROL DIGITALLY CONTROLLED AUDIO PROCESSOR
INPUT MULTIPLEXER - 2 STEREO INPUTS - SELECTABLE INPUT GAIN FOR OPTIMAL ADAPTATION TO DIFFERENT SOURCES ONE STEREO OUTPUT TREBLE, AND BASS CONTROL IN 2.0dB STEPS VOLUME CONTROL IN 1.0dB STEPS TWO SPEAKER ATTENUATORS: - TWO INDEPENDENT SPEAKER CONTROL IN 1.0dB STEPS FOR BALANCE FACILITY - INDEPENDENT MUTE FUNCTION ALL FUNCTION ARE PROGRAMMABLE VIA SERIAL BUS DESCRIPTION The is a volume tone (bass and treble) balance (Left/Right) processor for quality audio applications in TV systems. Selectable input gain is provided. Control of all the functions is accomplished by serial bus. BLOCK DIAGRAM
The AC signal setting is obtained by resistor networks and switches combined with operational amplifiers. Thanks to the used BIPOLAR/CMOS Technology, Low Distortion, Low Noise and DC stepping are obtained.100K G VOLUME TREBLE BASS SPKR ATT RIGHT VREF
2 INPUT MULTIPLEXER + GAIN 11 MUXOUTR 17 TREBLE(R) 12 SUPPLY 13 1 CREF 3
Symbol VS Tamb Tstg Operating Supply Voltage Operating Ambient Temperature Storage Temperature Range Parameter Value to 150 Unit V °CSDA SCL DIG_GND TREBLE(R) TREBLE(L) BIN(L) BOUT(L) BOUT(R) BIN(R) MUXOUT(R)
Symbol Rth j-pin Parameter Thermal Resistance Junction-pins Value 85 Unit °C/W
Symbol VS VCL THD S/N SC Supply Voltage Max. input signal handling Total Harmonic Distortion = 1KHz Signal to Noise Ratio V out = 1Vrms (mode = OFF) Channel Separation = 1KHz Input Gain in (2dB step) Volume Control Treble Control (1dB step) (2dB step) Parameter Min. Typ. 9 Max. 10.2 Unit V Vrms % dBBass Control (2dB step) Balance Control 1dB step Mute Attenuation
ELECTRICAL CHARACTERISTICS (refer to the test circuit Tamb = 9V, RL= = 600, all controls flat = 0dB), unless otherwise specified)Symbol Parameter Test Condition Min. Typ. Max. Unit
VS IS SVR Supply Voltage Supply Current Ripple Rejection dB K Vrms 1 dB
RIN VCL SIN Ginmin Ginman Gstep Input Resistance Clipping Level Input Separation Minimum Input Gain Maximum Input Gain Step Resolution THD = 0.3% The selected input is grounded through a 2.2µ capacitor
CRANGE AVMAX ASTEP EA ET VDC Amute Control Range Max. Attenuation Step Resolution Attenuation Set Error Tracking Error DC Step Mute Attenuation mV dBGb BSTEP RB Control Range Step Resolution Internal Feedback Resistance Max. Boost/cut K dB
Gt TSTEP Control Range Step Resolution Max. Boost/cut
CRANGE SSTEP EA VDC Amute Control Range Step Resolution Attenuation Set Error DC Step Mute Attenuation mV dB
NOTE1: 1) The device is functionally good 5V. a step down, on Vs, to 4V does't reset the device. 2) BASS and TREBLE response: The center frequency and the response quality can be chosen by the external circuitry.
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