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TAS5766M Datasheet(PDF) 42 Page - Texas Instruments |
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TAS5766M Datasheet(HTML) 42 Page - Texas Instruments |
42 / 84 page Current Segment DAC - AMP + Current Segment DAC + AMP - C13 C14 C19 C20 13 12 11 36 37 38 TAS5766M, TAS5768M SLAS965C – SEPTEMBER 2013 – REVISED JANUARY 2015 www.ti.com 9.2.1.2.2 Gain Setting and Supply Voltage If the TAS576xM is to be used in systems operating below 6 V it is recommended to change the maximum DAC output voltage from the nominal 2 Vrms FS(0 dB) to 1 Vrms FS (–6 dB), by setting register 2 on page 1 D4(Lch) / D0(Rch), Table 23. Table 23. GAIN and Supply Voltage SUPPLY VOLTAGE RANGE GAIN (via GAIN/FSW pin) DAC OUTPUT at FS Page 1 / Register 2 4.5 V – 6 V 14 dB 1 Vrms 00010001 6 V – 12 V 14 dB 2 Vrms default 12 V – 26 V 20 dB 2 Vrms default 9.2.1.2.3 DAC to AMP AC Coupling The TAS576xM uses an external ac-coupling capacitor between DACx output and AMP INPx input and a capacitor from INNx to ground for minimum dc-offset and click & pop during power on/off. Shown as C13, C14, C19 & C20 in the drawing here. The AMP INNPx and INNMx input stage is a fully differential input stage and the input impedance changes with the gain setting from 120 k Ω at 14 dB gain to 60 kΩ at 20 dB gain. The tolerance of the input resistor value is ±20%. The input ac-coupling capacitor together with the input impedance forms a high-pass filter with the following cut- off frequency: Figure 52. DAC to AMP AC Coupling If a flat bass response is required down to 20Hz the recommended cut-off frequency is a tenth of that, 2 Hz. Table 24 lists the recommended ac-coupling capacitors for the two gain step over a range of desired system high pass filter frequency. 42 Submit Documentation Feedback Copyright © 2013–2015, Texas Instruments Incorporated Product Folder Links: TAS5766M TAS5768M |
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