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ST25R3916 数据表(PDF) 28 Page - STMicroelectronics |
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ST25R3916 数据表(HTML) 28 Page - STMicroelectronics |
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28 / 157 page  Application information ST25R3916/7 28/157 DS12484 Rev 4 Filtering and gain stages The receiver chain has band pass filtering characteristics. The filtering is optimized to pass subcarrier frequencies while rejecting carrier frequency, low frequency noise and DC component. Filtering and gain is implemented in three stages, the first and the last stage have first order high pass characteristics while the mid stage has second order low-pass characteristic. The gain and filtering characteristics can be optimized depending on the application by writing the Receiver configuration register 1 (filtering), Receiver configuration register 3 (primarily gain in first stage) and Receiver configuration register 4 (gain in second and third stage). The gain of first stage is around 20 dB and can be reduced in six 2.5 dB steps. There is also a special boost mode available, which increases the max gain by additional 5.5 dB. The first stage gain can only be modified by writing Receiver configuration register 3. The default setting of this register is the minimum gain. Default first stage zero is located at 60 kHz, it can also be lowered to 40 or 12 kHz by writing option bits in the Receiver configuration register 1. The first stage can be reconfigured to second order high-pass at 600 kHz by option bit z600k. The control of the first and third stage zeros is done with common control bits (see Table 6). The gain in the second and third stage is 23 dB and can be reduced in six 3 dB steps. Gain of these two stages is included in AGC and Squelch loops or can be manually set in Table 5. Low-pass control rec1<5>lp2 rec1<4>lp1 rec1<3>lp0 -1 dB point 0 0 0 1200 kHz 0 0 1 600 kHz 0 1 0 300 kHz 10 0 2 MHz 10 1 7 MHz Others Not used Table 6. First and third zero setting rec1<3>z600k rec1<2>h200 rec1<1>h80 rec1<0>z12k First stage zero Third stage zero 00 0 0 60 kHz 400 kHz 0 1 0 0 200 kHz 0 0 1 0 40 kHz 80 kHz 00 0 1 12 kHz 200 kHz 0 0 1 1 80 kHz 0 1 0 1 200 kHz 10 0 0 600 kHz 400 kHz 1 1 0 0 200 kHz Others Not used |
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