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STV8216 数据表(PDF) 54 Page - STMicroelectronics |
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STV8216 数据表(HTML) 54 Page - STMicroelectronics |
54 / 97 page Register List STV82x6 54/97 CETH2 Channel 2 FM Carrier Level Threshold SQTH2 Channel 2 FM Squelch Threshold Bit Name Reset Function CRF2[7:0] 00000000 Channel 2 Carrier Recovery Frequency. Displays the instantaneous frequency offset of the Channel 2 Baseband PLL Address (hex): 38h Type: R/W Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 CETH2[7:0] Bit Name Reset Function CETH2[7:0] 00100000 This register is used to compare the carrier level in the channel and the threshold value. This level is measured after the channel filter and is relative to the full scale reference level (0 dB). This is used as part of the validation of an FM signal, if the carrier level is below the threshold, the signal is considered to be non-valid. CETH Threshold (dB) CETH Threshold (dB) FFh -6 10h -32 80h -12 08h -38 40h -18 00h OFF (All carrier levels are accepted) 20h -24 (Default) Address (hex): 39h Type: R/W Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 SQTH2[7:0] Bit Name Reset Function SQTH2[7:0] 00111100 The squelch detector measures the level of high frequency noise (> 40 kHz) and compares it to the threshold level (SQTH). If the level is below this value, the S/N of the FM signal is considered to be acceptable. Values are given for FM with standard deviation. SQTH S/N (dB) FAh 0 77h 10 3Ch 15 (Default) 23h 20 19h 25 |
类似零件编号 - STV8216 |
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类似说明 - STV8216 |
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