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TAS2770 Datasheet(PDF) 43 Page - Texas Instruments |
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TAS2770 Datasheet(HTML) 43 Page - Texas Instruments |
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43 / 92 page  43 TAS2770 www.ti.com SLASEM6A – OCTOBER 2017 – REVISED DECEMBER 2017 Product Folder Links: TAS2770 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated Table 67. Low EMI Spread Spectrum Mode AMP_SS Spread Spectrum 0 Disabled 1 Enabled (default) By default the Class-D amplifier's switching frequency is based on the device's trimmed internal oscillator. To synchronize switching to the audio sample rate, set the CLASSD_SYNC register bit high. When the Class-D is synchronized to the audio sample rate, the RATE_RAMP register bit must be set based whether the audio sample rate is based on a 44.1 kHz or 48 kHz frequency. For 44.1, 88.2 and 176.4 kHz, set this bit high. for 48, 96 and 192 kHz, set this bit low. This ensures that the internal ramp generator has the appropriate slope. Table 68. Class-D Synchronization Mode CLASSD_SYNC Synchronization Mode 0 Not synchronized to audio clocks (default) 1 Synchronized to audio clocks Table 69. Sample Rate for Class-D Synchronized Mode RAMP_RATE Playback Sample Rate 0 48, 96 and 192 kHz (default) 1 44.1, 88.2 and 174.6 kHz 8.4.4 SAR ADC A 12-bit SAR ADC monitors VBAT voltage and die temperature. The results of these conversions are available via register readback (VBAT_CNV[11:0] and TMP_CNV[7:0] registers respectively). VBAT voltage conversions are also used by the limiter and brown out prevention features. The ADC runs at a fixed 667 kHz sample rate (1.5 µs per conversion) interleaved between VBAT voltage and die temperature measurements. This gives an effective sample rate of 333 kHz (3 µs per conversion) with a latency of 1 sample (1.5 µs). This gives a worst case measurement latency of 4.5 µs. Actual VBAT voltage is calculated by dividing the VBAT_CNV[11:0] register by 256. Actual die temperature is calculated by dividing the TMP_CNV[11:0] register by 16 and then subtracting 93. Table 70. ADC VBAT Voltage Conversion VBAT_CNV[11:0] VBAT Voltage (V) 0x000 0 V 0x001 0.0039 V ... ... 0xC9A 12.6016 V ... ... 0xFFE 15.9922 V 0xFFF 15.9961 V Table 71. ADC Die Temperature Conversion TMP_CNV[11:0] Die Temperature (°C) 0x000 -93 °C 0x001 -92.9375 °C ... ... 0x760 25 °C ... ... 0xFFE 162.8750 °C 0xFFF 162.9375 °C |
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