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TDA1305T Arkusz danych(PDF) 8 Page - NXP Semiconductors |
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TDA1305T Arkusz danych(HTML) 8 Page - NXP Semiconductors |
8 / 20 page 1995 Dec 08 8 Philips Semiconductors Preliminary specification Stereo 1fs data input up-sampling filter with bitstream continuous dual DAC (BCC-DAC2) TDA1305T Mute Soft mute is controlled by the MUSB at pin 9. When the input is active LOW the value of the samples is decreased smoothly to zero following a cosine curve. To step down the value of the data 32 coefficients are used, each one being used 31 times before stepping onto the next. When MUTE is released (pin 19 = HIGH), the samples are returned to the full level again following a cosine curve with the same coefficients being used in the reverse order. Mute is synchronized to prevent operation in the middle of a word. De-emphasis A digital de-emphasis is implemented for three sample rates (32, 44.1 and 48 kHz). By selecting DEEM1 and DEEM2 de-emphasis can be applied by means of a FIR filter. Time constants of the de-emphasis are 50 µs and 15 µs. De-emphasis is synchronized to prevent operation in the middle of a word. The de-emphasis deviation from ideal 50 µs and 15 µs de-emphasis is given in Table 4. Table 2 De-emphasis. Attenuation Attenuation is controlled by the ATSB input (pin 21). When the input is active LOW the sample is multiplied by a coefficient that provides 12 dB attenuation. If the input is HIGH the multiplication factor is 1. Attenuation is synchronized to prevent operation in the middle of a word. Double-speed mode Double speed is controlled by the DSMB input (pin 20). When the input is active LOW the device operates in the double-speed mode. DEEM1 DEEM2 CONDITION 0 0 de-emphasis disabled 0 1 de-emphasis for fs = 32 kHz 1 0 de-emphasis for fs = 4.1 kHz 1 1 de-emphasis for fs = 48 kHz Oversampling filter (normal-speed mode) In the normal-speed mode the oversampling filter consists of: • A 91st order half-band low-pass FIR filter which increases the oversampling rate from 1 time to 2 times. • A 23rd order quarter band low-pass FIR filter which increases the oversampling rate from 2 times to 8 times. • A linear interpolation section which increases the oversampling rate to 16 times. This removes the spectral components around 8fs. • A sample-and-hold section which provides another 6 times oversampling to 96 times. The zero-order hold characteristic of this sample-and-hold section plus the 1st order analog filtering remove the spectral components around 16fs. Pass-band ripple and stop-band attenuation for normal-speed are given in Table 3. Oversampling filter (double-speed mode) In the double-speed mode the oversampling filter consists of: • A 51st order half-band low-pass FIR filter which increases the oversampling rate from 1 time to 2 times. • A 7th order half-band low-pass FIR filter which increases the oversampling rate from 2 times to 4 times. • A linear interpolation section which increases the oversampling rate to 8 times. This removes the spectral components around 4fs. • A sample-and-hold section which provides another 6 times oversampling to 48 times. The zero-order hold characteristic of this sample-and-hold section plus the 1st order analog filtering remove the spectral components around 8fs. Pass-band ripple and stop-band attenuation for double-speed are given in Table 3. |
Podobny numer części - TDA1305T |
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Podobny opis - TDA1305T |
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