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TEA5764HN датащи(PDF) 9 Page - NXP Semiconductors |
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TEA5764HN датащи(HTML) 9 Page - NXP Semiconductors |
9 / 64 page TEA5764HN_2 © Koninklijke Philips Electronics N.V. 2005. All rights reserved. Product data sheet Rev. 02 — 9 August 2005 9 of 64 Philips Semiconductors TEA5764HN FM radio + RDS Before a tuning cycle is initiated the IF count period can be set to 2 ms or to 15.6 ms by bit IFCTC. When the IF count period is set to 2 ms, initiating the tuning algorithm with a preset (bit SM = 0) will always give an RDS update as shown in Section 8.22.1. In case the IF count time is set to 15.6 ms, the tuning flowchart illustrated in Figure 3 is used. Once tuned, the IF count period is always 15.6 ms. 8.12 Voltage level generator and analog-to-digital converter The voltage level indicates the field strength received by the antenna. The voltage level is analog-to-digital converted to a 4-bit word and output via the I2C-bus. The ADC level is continuously active and can be read at any time via the I2C-bus. It also activates a flag when the voltage level falls below a predefined selectable threshold. Bit LHSW allows either large or small hysteresis steps to be chosen; see Table 24 and Section 9.1.4.5. When the ADC level is set to 3, its minimum value, the search algorithm will only stop at channels having a RF level higher than, or equal to, ADC level 3. After completing the search algorithm and being tuned to a station, due to hysteresis the effective limit will be set to 0. This means that the continuous ADC level check will never set the LEVFLAG. 8.13 Mute 8.13.1 Soft mute The low-pass filtered voltage level drives the soft mute attenuator at low RF input levels: the audio output is faded and hence also the noise (see Figure note 1 in Figure 15 and Figure 17). The soft mute function can also be switched off via the I2C-bus, using bit SMUTE. 8.13.2 Hard mute The audio outputs VAFL and VAFR can be hard-muted by bit MU in byte TNCTRL2, which means that they are put into 3-state. This can also be done by setting bits Left Hard Mute (LHM) or Right Hard Mute (RHM) in byte TESTBITS, which allows either one or both channels to be muted and forces the TEA5764HN to mono mode. When the TEA5764HN is in Standby mode the audio outputs are hard-muted. 8.13.3 Audio frequency mute The audio signal is muted by setting bit AFM of the TNCTRL1 register to logic 1. In the soft mute attenuator the audio signal is blocked and so pins VAFL and VAFR will be at their DC biasing point with no signal. The audio is automatically muted during an RDS update as shown in the flowchart of Figure 3. When the audio must be muted during Search mode, it is done by setting bit AFM to logic 1 before the search action and resetting it to logic 0 afterwards. Setting bit AFM to logic 0 stops the RDS data. 8.14 MPX decoder The PLL stereo decoder is adjustment free. It can be switched to mono via the I2C-bus. |
Аналогичный номер детали - TEA5764HN |
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Аналогичное описание - TEA5764HN |
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