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TAS5766M Datasheet(PDF) 42 Page - Texas Instruments

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Part # TAS5766M
Description  Smart Amp
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TAS5766M Datasheet(HTML) 42 Page - Texas Instruments

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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
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Product Folder Links: TAS5766M TAS5768M


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