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AN332 Datasheet(PDF) 40 Page - Silicon Laboratories |
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AN332 Datasheet(HTML) 40 Page - Silicon Laboratories |
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40 / 302 page  AN332 40 Rev. 1.0 Property 0x2107. TX_PILOT_FREQUENCY This property is used to set the frequency of the stereo pilot in 1 Hz steps. The stereo pilot is nominally set to 19 kHz for stereo operation, however the pilot can be set to any frequency from 0 Hz to 19 kHz to support the generation of an audible test tone. The pilot tone is enabled by setting the PILOT bit (D0) of the TX_COMPONENT_ENABLE property. When using the stereo pilot as an audible test generator it is recommended that the RDS bit (D2) be disabled. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. Available in: All Default: 0x4A38 (19000) Units: 1 Hz Step: 1 Hz Range: 0–19000 Property 0x2200. TX_ACOMP_ENABLE Selectively enables the audio dynamic range control and limiter. The CTS bit (and optional interrupt) is set when it is safe to send the next command. This property may only be set or read when in powerup mode. The default is limiter enabled and audio dynamic range control disabled. Note: LIMITEN bit is supported in FMTX component 2.0 or later. Reset this bit to 0 in FMTX component 1.0. Available in: All Default: 0x0002 Bit D15 D14 D13 D12 D11 D10 D9D8 D7D6D5D4 D3 D2D1D0 Name FREQ[15:0] Bit Name Function 15:0 FREQ Stereo Pilot Frequency Sets the frequency of the stereo pilot in 1 Hz steps. Range 0 Hz–19000 Hz (default is 0x4A38 or 19 kHz). Bit D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Name 0000 00 0 0 0 0 0 0 0 0 LIMITEN ACEN Bit Name Function 15:2 Reserved Always write to 0. 1 LIMITEN Audio Limiter. 0=Disable 1 = Enable (default) 0ACEN Transmit Audio Dynamic Range Control Enable. 0 = Audio dynamic range control disabled (default) 1 = Audio dynamic range control enabled |
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