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TDA1373H Datasheet(PDF) 10 Page - NXP Semiconductors |
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TDA1373H Datasheet(HTML) 10 Page - NXP Semiconductors |
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10 / 40 page  1996 Jul 17 10 Philips Semiconductors Product specification General Digital Input (GDIN) TDA1373H SLAVE-VCO AND SLAVE-VCXO MODES In the SLAVE-VCO and SLAVE-VCXO modes, the GDIN can pass an exact copy of the incoming samples to the output, e.g. for storage on a digital medium such as CD-R. The output sample rate tracks any input sample rate within the frequency range of the external VC(X)O (fso =fsi). In the SLAVE-VCO mode a pitch variation of ±12.5% around the nominal sample frequency can be tolerated. Data path (see Fig.5) The signal at input sample frequency fsi comes in via one of the DI1 inputs (IEC 958). The ADIC signal passes through the FIFO/GAIN block and can be fed through the IN-BAND NOISE SHAPER to the serial output DO1. Additionally, the signal is present at DO2 (4fso) and at the Bitstream outputs AOL and AOR. Exact copies for digital use (e.g. write to a disk) from the input signal can be retrieved at output FO (this signal might be affected by jitter since it has not passed through the FIFO/GAIN block). By means of data path switch DSO, this direct output of the ADIC block can also be fed to output DO1. Note that in this event the DO1 serial format becomes equal to the FO format (see Table 3). AD/DA MODE In this mode, the GDIN supports an economic realization of analog-to-digital and digital-to-analog conversion, in accordance with the Bitstream principle. This requires a Bitstream sigma-delta modulator and a Bitstream DAC, since the up-sampling and down-sampling filters of the sample rate convertor are reused. ADC and DAC can be simultaneously performed. Data path DA conversion (see Fig.6) The signal at sample frequency fso comes in via serial input DI2X or via one of the DI1 inputs (IEC 958). The signal passes through the FIFO/GAIN part and is interpolated in the up-sampling filters. A Bitstream digital filter converts this signal into a Bitstream signal at outputs AOL and AOR, after which it can be filtered by a Bitstream DAC like the TDA1547. Data path AD conversion (see Fig.6) The Bitstream signal from the sigma-delta modulator enters the GDIN at inputs AIL and AIR. The down-sampling filters decimate this signal to fso and after in-band noise shaping (selectable), the output signal is present at serial output DO1. |
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