Datasheet

APPLICATION SUGGESTIONS (see Test and Application Circuits of the Fig. 1)
The recommended values of the external components are those shown on the application circuit of Fig-
ure 1. Different values can be used; the following table can help the designer.
COMPONENTS SUGGESTED VALUE PURPOSE
LARGER THAN
SUGGESTED
SMALLER THAN
SUGGESTED
R1 (*) 22k INPUT RESISTANCE INCREASE INPUT
IMPRDANCE
DECREASE INPUT
IMPEDANCE
R2 680
Ω
CLOSED LOOP GAIN
SET TO 30dB (**)
DECREASE OF GAIN INCREASE OF GAIN
R3 (*) 22k INCREASE OF GAIN DECREASE OF GAIN
R4 22k ST-BY TIME
CONSTANT
LARGER ST-BY
ON/OFF TIME
SMALLER ST-BY
ON/OFF TIME;
POP NOISE
R5 10k MUTE TIME
CONSTANT
LARGER MUTE
ON/OFF TIME
SMALLER MUTE
ON/OFF TIME
C1 0.47
µ
F INPUT DC
DECOUPLING
HIGHER LOW
FREQUENCY
CUTOFF
C2 22
µ
F FEEDBACK DC
DECOUPLING
HIGHER LOW
FREQUENCY
CUTOFF
C3 10
µ
F MUTE TIME
CONSTANT
LARGER MUTE
ON/OFF TIME
SMALLER MUTE
ON/OFF TIME
C4 10
µ
F ST-BY TIME
CONSTANT
LARGER ST-BY
ON/OFF TIME
SMALLER ST-BY
ON/OFF TIME;
POP NOISE
C5 22
µ
F BOOTSTRAPPING SIGNAL
DEGRADATION AT
LOW FREQUENCY
C6, C8 1000
µ
F SUPPLY VOLTAGE
BYPASS
DANGER OF
OSCILLATION
C7, C9 0.1
µ
F SUPPLY VOLTAGE
BYPASS
DANGER OF
OSCILLATION
(*) R1 = R3 FOR POP OPTIMIZATION
(**) CLOSED LOOP GAIN HAS TO BE
≥
24dB
TDA7295
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