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TDA8295C2 Datasheet(PDF) 10 Page - NXP Semiconductors |
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TDA8295C2 Datasheet(HTML) 10 Page - NXP Semiconductors |
10 / 83 page TDA8295_C2_2 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 02 — 27 November 2009 10 of 83 NXP Semiconductors TDA8295 Digital global standard low IF demodulator for analog TV and FM radio 8. Functional description 8.1 IF ADC The low IF spectrum (1 MHz to 10 MHz) from the Silicon Tuner TDA8725A or TDA1827x is fed symmetrically to the 12-bit IF ADC of the TDA8295, where it is sampled with 54 MHz or 27 MHz. All the anti-aliasing filtering is already done in the Silicon Tuner. 8.2 Filters The internal filters permit to reduce the sampling rate to 13.5 MHz, and to form a complex signal to ease the effort of further signal processing. Before this, the DC offset (coming from the ADC) is removed. In addition, standard dependent notch filters for the adjacent sound carriers protect the picture carrier PLL from malfunctioning and avoid disturbances (i.e. moire) becoming visible in the video output. 8.3 PLL demodulator The second-order PLL is the core block of the whole IC. It is very robust against adverse field conditions, like excessive overmodulation, no residual carrier presence or unwanted phase or frequency modulation of the picture carrier. The PLL output is the synchronously demodulated channel. The AFC data is available via the I2C-bus. 8.4 Nyquist filter, video low-pass filter, video and group delay equalizer, video leveling The afore-mentioned down-mixed complex signal at the mixer CORDIC output, already consisting of the demodulated content of the picture carrier together with the sound carriers (the so-called intercarriers), is running through a Nyquist filter to get a flat video response and is made real. Afterwards, a video low-pass filter suppresses the sound carriers and other disturbers. Next comes the equalizer circuit to remove the transmitter group delay predistortion. Table 5. Pin type description Type Description AI analog input AO analog output GND ground I digital input I/O digital input and output O digital output OD open-drain output PS power supply T 3-state |
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