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NXP Semiconductors
12. Application information
12.1 Diagnostic output
12.2 Mode select switch
TDA8566_6
Product data sheet
Table 8.
Dynamic characteristics
V
= 14.4 V; T
= 25 C; R
P
amb
otherwise specified.
Symbol
Parameter
V
output signal
o(mute)
voltage in mute
CMRR
common mode
rejection ratio
[1]
Dynamic distortion detector active; pin CLIP is LOW.
[2]
Frequency response externally fixed.
[3]
V
= V
= 2 V (p-p); R
ripple
ripple(max)
[4]
Noise measured in a bandwidth of 20 Hz to 20 kHz.
[5]
Common mode rejection ratio measured at the output (over R
V
3.5 V (RMS); f
common
[6]
Common mode rejection ratio measured at the output (over R
V
3.5 V (RMS); f
common
Special care must be taken in the PCB layout to separate pin CLIP from
pins IN1+, IN1 , IN2+ and IN2 to minimize the crosstalk between the CLIP output and
the inputs.
To avoid switch-on plops, it is advisable to keep the amplifier in the mute mode during
150 ms (charging of the input capacitors at pins IN1+, IN1 , IN2+ and IN2 ). The circuit
in
Figure 8
slowly ramps-up the voltage at the mode select switch pin when switching on
and results in fast muting when switching off.
Fig 8. Mode select switch circuit
2
40 W/2
...continued
= 2 ; f
= 1 kHz; measured in test circuit of
L
i
Conditions
V
= V
= 1 V (RMS)
in
in(max)
R
= 0
s
R
= 45 k
s
= 0 .
s
= 100 Hz to 10 kHz; R
= 0 .
i
s
= 1 kHz; R
= 45 k . The mismatch of the input coupling capacitors is excluded.
i
s
+ V
P
S
10 k
+
47 F
Rev. 06 — 15 October 2007
TDA8566
stereo BTL car radio power amplifier
Figure
Min
Typ
-
-
[5]
60
75
[6]
40
-
) with both inputs tied together;
L
) with both inputs tied together;
L
100
mode
select
switch
100 k
mgd102
© NXP B.V. 2007. All rights reserved.
9; unless
Max
Unit
2
mV
-
dB
-
dB
11 of 21
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