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TDA8745 Datasheet(PDF) 10 Page - NXP Semiconductors |
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TDA8745 Datasheet(HTML) 10 Page - NXP Semiconductors |
10 / 40 page 1996 Mar 11 10 Philips Semiconductors Preliminary specification Satellite sound receiver with I2C-bus control TDA8745 Output pins 23 and 22 can be muted by setting the OML and OMR signals to logic 1. In addition, automatic muting is also possible, the presence detector (as described in Section “Presence detector”) sets the PDL bit (PDR for other channel). Absence of a carrier at the selected frequency results in automatic muting. This mechanism is enabled or inhibited by the PDM bit (Presence Detector auto Mute). All outputs (pins 21, 22 and 23) are line drivers with SCART level capability and are short-circuit protected by means of 125 Ω output resistors. Pins 34 and 30 are also line drivers at SCART level and can be used as signal outputs before the IC’s output selection (i.e. for decoder box use). ABBREVIATIONS BPF = Band-Pass Filter. fmod = modulating frequency. ∆fM = frequency deviation of the main Channel. ∆fS1 = frequency deviation of secondary Channel 1 (left). ∆fS2 = frequency deviation of secondary Channel 2 (right). fOM = carrier frequency of main Channel. fOS1 = carrier frequency of secondary Channel 1. fOS2 = carrier frequency of secondary Channel 2. IF = Intermediate Frequency. IL = Input Left. IR = Input Right. LPF = Low-Pass Filter. NR = Noise Reduction. OML = Output Mute Left. OMR = Output Mute Right. OS = Output Select. PDM = Presence Detector auto Mute. PE = Port Extension. PLL = Phase-Locked Loop. POR = Power-On Reset. S/N = Signal-to-Noise ratio. VCO = Voltage Controlled Oscillator. handbook, halfpage 10 5 MBE284 10 4 10 3 102 10 4 0 8 12 16 20 24 transfer (dB) f (Hz) 20 dB 0 dB Fig.4 Noise reduction transfer as function of input level. handbook, halfpage 10 5 MBE285 10 4 10 3 102 10 4 0 4 8 8 12 16 transfer (dB) f (Hz) 50 µs 75 µs flat J17 Fig.5 LF de-emphasis curves. |
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