поискавой системы для электроныых деталей |
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TDA8741 датащи(PDF) 8 Page - NXP Semiconductors |
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TDA8741 датащи(HTML) 8 Page - NXP Semiconductors |
8 / 24 page October 1994 8 Philips Semiconductors Product specification Satellite sound circuit with noise reduction TDA8741; TDA8741H NOISE REDUCTION (NR) The noise reduction can be regarded as an input level-dependent low-pass filter (adaptive de-emphasis system) followed by a fixed de-emphasis. With maximum input level (0 dB) the frequency response of the first part (i.e. without the fixed de-emphasis) is virtually flat. As the input level is lowered by x-dB, the higher output frequencies will be reduced an extra x-dB with respect to the lower frequencies (1 : 2 expansion). The NR output signal is fed to pin 36 (32) (left) and pin 32 (28) (right) via an internal resistor. Fixed de-emphasis is achieved by these resistors and external capacitors connected to ground. The signals are DC decoupled via pins 36/35 (32/31) and 32/33 (28/29) and then routed to the output selectors. OUTPUT SELECTION With the output selector (see Table 1) the outputs at pins 25 and 24 (21 and 20) can be switched to the different channels. Both outputs can be switched to both secondary channels, to the main channel and to the external inputs at pin 28 and 27 (24 and 23) for IC chaining purposes. Pin 23 (19) is a separate output which delivers the main channel only, thereby creating the possibility of having three different output channels simultaneously e.g. for use in hi-fi VCRs. The outputs at pins 25 and 24 (21 and 20) can be muted by setting the MUTE signal at pin 13 (8) to logic 1 (switch positions 6 and 7). The output at pin 23 (19) can be muted by setting the MUTE signal and the EXT/INT signal at pin 26 (22) both logic 1 (switch position 7). All outputs at pins 23, 24 and 25 (19, 20 and 21) are line drivers with SCART level capability and are short-circuit protected by 125 Ω output resistors. Output level of all channels = −6 dBV typical when frequency deviation of FM signal is 54% of maximum frequency deviation (i.e. 0.54 × 85 kHz = 46 kHz for the main channel and 0.54 × 50 kHz = 27 kHz for the secondary channels) at 1 kHz modulation frequency (reference level). ABBREVIATIONS 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. LPF = Low-Pass Filter. NR = Noise Reduction. PLL = Phase-Locked-Loop. |
Аналогичный номер детали - TDA8741 |
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Аналогичное описание - TDA8741 |
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