TDA8932T NXP Semiconductors, TDA8932T Datasheet - Page 26

• Manufacturer Part Number: TDA8932T
• Description: Audio Amplifiers 2X15W BTL CLASS D AMP+VOLCTRL
• Manufacturer: NXP Semiconductors

Specifications of TDA8932T

• Product: Class-D
• Output Power: 50 W
• Available Set Gain: 36 dB
• Common Mode Rejection Ratio (min): 56 dB
• Thd Plus Noise: 0.015 %
• Operating Supply Voltage: 22 V
• Maximum Power Dissipation: 5000 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Audio Load Resistance: 8 Ohms
• Dual Supply Voltage: +/- 11 V
• Input Signal Type: Differential
• Minimum Operating Temperature: - 40 C
• Output Signal Type: Differential, Single
• Supply Type: Single or Dual
• Supply Voltage (max): 36 V
• Supply Voltage (min): 10 V
• Output Type: 1-Channel Mono or 2-Channel Stereo
• Package / Case: SOIC-32
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: TDA8932T/N1,112

NXP Semiconductors
TDA8932_2
Preliminary data sheet
14.5 Gain reduction
The 3 dB cut-off frequency is equal to:
Where:
Table 15
or 20 Hz 3 dB cut-off frequency.
Table 15.
The gain of the TDA8932 is internally fixed at 30 dB for SE (or 36 dB for BTL). The gain
can be reduced by a resistive voltage divider at the input (see
When applying a resistive divider, the total closed-loop gain G
Equation 8
Where:
G
Impedance ( )
4
6
8
f
Fig 9. Input configuration for reducing gain
–
v tot
f
R
Cse = single-ended capacitance [F]; see
G
G
R
R1 = series resistor [ ]
R2 = series resistor [ ]
3dB
-3dB
L
EQ
v(tot)
v(cl)
= load impedance [ ]
=
= equivalent resistance, R3 and Z
= 3 dB cut-off frequency [Hz]
=
= closed-loop voltage gain, fixed at 30 dB for SE [dB]
= total closed-loop voltage gain [dB]
---------------------------------- -
2
shows an overview of the required SE capacitor values in case of 60 Hz, 40 Hz
G
SE capacitor values
and
v cl
R
1
L
+
Equation
20
Cse
log
Rev. 02 — 12 December 2006
Cse ( F)
f
680
470
330
audio in
-3dB
----------------------------------------- -
R
9:
EQ
= 60 Hz
+
R
R1
EQ
+
R1
R2
R2
i
[ ]
470 nF
470 nF
Figure 28
f
1000
680
470
-3dB
= 40 Hz
R3
100
k
001aad762
v(tot)
Figure
Class-D audio amplifier
can be calculated by
f
2200
1500
1000
-3dB
9).
TDA8932
© NXP B.V. 2006. All rights reserved.
= 20 Hz
26 of 45
(7)
(8)