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STV8227 数据表(PDF) 65 Page - STMicroelectronics |
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STV8227 数据表(HTML) 65 Page - STMicroelectronics |
65 / 149 page 65/149 STV82x7 Register List SQTH1 Channel 1 FM Squelch Threshold Register CAROFFSET1 Channel 1 DCO Carrier Offset Compensation Bit Name Reset Function CETH1[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 (Recommended Value) 80h -12 08h -38 40h -18 00h OFF (all carrier levels are accepted) 20h -24 (Default) Address: 21h Type: R/W Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 SQTH1[7:0] Bit Name Reset Function SQTH1[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 Address: 22h Type: R/W Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 CAROFFSET1[7:0] (S) Bit Name Reset Function CAROFFSET1[7:0] 00000000 This value is used to correct the carrier frequency offset of the incoming IF signal. Automatic frequency control in FM mode can be implemented by registers DC_REMOVAL_L and DC_REMOVAL_R. A DCO frequency offset (in two’s complement format) is added to the pre-programming value by AUTOTSD in the CARFQ1 registers (corresponding to the standard IF carrier frequency). The programmable carrier offset ranges from -192 kHz to +190.5 kHz with a resolution of 1.5 kHz. For standard FM deviation, the value displays by DC_REMOVAL_L and DC_REMOVAL_R can be directly loaded in CAROFFSET1 to exactly compensate the carrier offset on Channel 1 |
类似零件编号 - STV8227 |
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类似说明 - STV8227 |
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