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Zakładka z wyszukiwarką danych komponentów |
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TDA7319D Arkusz danych(PDF) 4 Page - STMicroelectronics |
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TDA7319D Arkusz danych(HTML) 4 Page - STMicroelectronics |
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4 / 16 page  ELECTRICAL CHARACTERISTICS (continued) Symbol Parameter Test Condition Min. Typ. Max. Unit GENERAL eNO Output Noise All Gains 0dB (B = 20 to 20kHz flat) 5 15 µV Et Total Tracking Error AV = 0 to -24dB 0 1 dB AV = -24 to -47dB 0 2 dB S/N Signal to Noise Ratio All Gains = 0dB; VO =1Vrms 106 dB SC Channel Separation 80 100 dB d Distortion AV =0; Vin =1Vrms 0.01 0.08 % BUS INPUTS Vil Input Low Voltage 1V Vih Input High Voltage 3 V Iin Input Current Vin = 0.4V -5 5 µA VO Output Voltage SDA Acknowledge IO = 1.6mA 0.4 0.8 V Note 1: the device is functionally good at Vs = 5V. A step down, on VS, to 4V does’t reset the device. APPLICATION SUGGESTIONS The first and the last stages are volume control blocks. The control range is 0 to -47dB (mute) with a 1dB step. The very high resolution allows the implementation of systems free from any noisy acoustical effect. The TDA7319 audioprocessor provides 3 bands tones control. Bass, Middle Stages The Bass and the middle cells have the same structure. The Bass cell has an internal resistor Ri = 44K Ω typical. The Middle cell has an internal resistor Ri = 25K Ω typical. Several filter types can be implemented, connect- ing external components to the Bass/Middle IN and OUT pins. The fig.1 refers to basic T Type Bandpass Filter starting from the filter component values (R1 in- ternal and R2,C1,C2 external) the centre fre- quency Fc, the gain Av at max. boost and the fil- ter Q factor are computed as follows: FC = 1 2 ⋅ π ⋅√ Ri, R2, C1, C2 AV = R2 C2 + R2 C1 + Ri C1 R2 C1 + R2 C2 Q = √ Ri R2 + C1 C2 R2 C1 + R2 C2 Viceversa, once Fc, Av, and Ri internal value are fixed, the external components values will be: C1 = AV − 1 2 ⋅ π ⋅ Ri ⋅ Q C2 = Q 2 ⋅ C1 AV − 1Q2 R2 = AV − 1 − Q2 2 ⋅ π ⋅ C1 ⋅ FC ⋅ (AV − 1) ⋅Q Treble Stage The treble stage is a high pass filter whose time constant is fixed by an internal resistor (25K Ω typical) and an external capacitor connected be- tween treble pins and ground Typical responses are reported in Figg. 10 to 13. CREF The suggested 10 µF reference capacitor (CREF) value can be reduced to 4.7 µF if the application requires faster power ON. Ri internal C2 OUT IN C1 R2 D95AU313 Figure 1. TDA7319 4/16 |
Podobny numer części - TDA7319D |
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Podobny opis - TDA7319D |
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