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TDA7705 数据表(PDF) 31 Page - STMicroelectronics |
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TDA7705 数据表(HTML) 31 Page - STMicroelectronics |
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31 / 42 page ![]() TDA7705 Front-end processing Doc ID 15938 Rev 9 31/42 Table 23. Register 0x01 Register number Register definition MSB LSB 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9876543210 FM mixer input selector 0 1 1 0 input #1 1 0 0 1 input #2 FM mixer gain 0high 1low FM AGC time constant 0 normal 1 fast FM AGC output mode 00 normal 01 constant 15 mA 10 constant 1 mA Table 24. Register 0x02 Register number Register definition MSB LSB 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 FM RF AGC threshold @ mixin 0 0 87 dBµV 0 1 89 dBµV 1 0 91 dBµV 1 1 93 dBµV FM iF AGC threshold @ IFADC in 0 0 120 dBµV 0 1 122 dBµV 1 0 124 dBµV Tuning DAC enable 0off 1on Tuning DAC programming(1) 000 00 00 0 0 000 00 00 1 1 …… …… ……… … … 111 11 11 0 510 111 11 11 1 511 1. Normally handled by tuner drivers. |
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