TFA9842AJ Просмотр технического описания (PDF) - NXP Semiconductors.
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TFA9842AJ Datasheet PDF : 18 Pages
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Philips Semiconductors
TFA9842AJ
7.5 W stereo power amplifier with volume control
13.1.2 Volume control drive options
R1
10 kΩ
D1
5.6 V
GND
VCC
T1
5V
R2
1 kΩ
PWM R5
3.3 V 1 kΩ
T2
R3
1 kΩ
R4
1 kΩ
T3
Fig 12. Volume control drive circuit with 3.3 V PWM
VC
C1
10 µF
001aae337
PWM
R4
5V
1 kΩ
VC
C1
10 µF
R1
10 kΩ
D1
10 V
VCC
T1
R5
16 kΩ
R6
16 kΩ
VC
C1
10 µF
001aae338
001aae339
Fig 13. Volume control drive circuit with 5 V Fig 14. Volume control drive circuit with
PWM
potentiometer
13.2 Printed-circuit board
13.2.1 Layout and grounding
To obtain a high-level system performance, certain grounding techniques are essential.
The input reference grounds have to be tied with their respective source grounds and
must have separate tracks from the power ground tracks; this will prevent the large output
signal currents from interfering with the small AC input signals. The small-signal ground
tracks should be physically located as far as possible from the power ground tracks.
Supply and output tracks should be as wide as possible for delivering maximum output
power.
TFA9842AJ_1
Preliminary specification
Rev. 01 — 28 April 2006
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
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