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TDA5051ATD-T Folha de dados(PDF) 6 Page - NXP Semiconductors |
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6 / 29 page TDA5051A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved. Product data sheet Rev. 5 — 13 January 2011 6 of 29 NXP Semiconductors TDA5051A Home automation modem Remark: In transmission mode, the receiving part of the circuit is not disabled and the detection of the transmitted signal is normally performed. In this mode, the gain chosen before the beginning of the transmission is stored, and the AGC is internally set to −6dB as long as DATA_IN is LOW. Then, the old gain setting is automatically restored. 8.2 Reception mode The input signal received by the modem is applied to a wide range input amplifier with AGC ( −6 dB to +30 dB). This is basically for noise performance improvement and signal level adjustment, which ensures a maximum sensitivity of the ADC. An 8-bit conversion is then performed, followed by digital band-pass filtering, to meet the CISPR16 normalization and to comply with some additional limitations met in current applications. After digital demodulation, the baseband data signal is made available after pulse shaping. The signal pin (RX_IN) is a high-impedance input which has to be protected and DC decoupled for the same reasons as with pin TX_OUT. The high sensitivity (82 dB μV) of this input requires an efficient 50 Hz rejection filter (realized by the LC coupling network), which also acts as an anti-aliasing filter for the internal digital processing; (see Figure 15). 8.3 Data format 8.3.1 Transmission mode The data input (DATA_IN) is active LOW: this means that a burst is generated on the line (pin TX_OUT) when DATA_IN pin is LOW. Pin TX_OUT is in a high-impedance state as long as the device is not transmitting. Successive logic 1s are treated in a Non-Return-to-Zero (NRZ) mode, see pulse shapes in Figure 8 and Figure 9. 8.3.2 Reception mode The data output (pin DATA_OUT) is active LOW; this means that the data output is LOW when a burst is received. Pin DATA_OUT remains LOW as long as a burst is received. 8.4 Power-down mode Power-down input (pin PD) is active HIGH; this means that the power consumption is minimum when pin PD is HIGH. Now, all functions are disabled, except clock generation. |
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