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AS3911 数据表(PDF) 21 Page - ams AG |
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AS3911 数据表(HTML) 21 Page - ams AG |
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21 / 149 page ![]() ams Datasheet, Confidential: 2013-Oct [2-03] AS3911 – 21 Appl icatio n I n f o rm a t i o n Figure 14: First and Third Stage Zero Setting Figure 15 provides information on the recommended filter settings. For all supported operation modes and receive bit rates there is an automatic preset defined, additionally some alternatives are listed. Automatic preset is done by sending direct command Analog Preset. There is no automatic preset for Steam and Transparent modes. Since selection of filter characteristics also modifies gain, the gain range for different filter settings is also listed. Figure 15: Receiver Filter Selection and Gain Range rec1<2> h200 rec1<1> h80 rec1<0> z12k First Stage Zero Third Stage Zero 0 0 0 60 kHz 400 kHz 1 0 0 60 kHz 200 kHz 010 40 kHz 80 kHz 0 0 1 12 kHz 200 kHz 011 12 kHz 80 kHz 1 0 1 12 kHz 200 kHz Other Not used Gain [dB] Comment 000 0 0 0 43.4 28 26.4 11 49.8 Automatic preset for ISO14443A fc/128 and NFC Forum Type 1 Tag 000 1 0 0 44 29 27.5 12 49.7 Automatic preset for ISO14443B fc/128 ISO14443 fc/64 001 1 0 0 44.3 29 27 11.7 49.8 Recommended for 424/484 kHz sub-carrier 000 0 1 0 41.1 25.8 23.6 8.3 46.8 Alternative choice for ISO14443 fc/32 and fc/16 100 0 1 0 32 17 17.2 2 37.6 Automatic preset for ISO14443 fc/32 and fc/16 Alternative choice for fc/8 (1.7 kb/s) 100 0 0 0 32 17 17.2 2 37.6 Alternative choice for fc/8 (1.7 kb/s) |
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