AP8111 Ver la hoja de datos (PDF) - Unspecified
Número de pieza
componentes Descripción
Fabricante
AP8111 Datasheet PDF : 6 Pages
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P
A ASP
4 Pin Configuration
AP8111
1 LOUT
ROUT 28
2 LIN
RIN 27
3 VREF
CL2A 26
4 NC
NC 25
5 CB1A
CL2B 24
6 CB1B
1
CB3 23
7 CB1
CB3A 22
8 GND
CB3B 21
9 TBGAIN COMPC1 20
10 CB2B
VCC 19
11 CB2A
NC 18
12 CB2 COMPC2 17
13 BYPASS FOUT 16
14 COMPI
CL1 15
5 Operating Modes
The chip can be configured in 3 modes of operations – Power down mode, bypass mode, TruBass mode.
In power down mode, the chip is power down and consumed minimal current.
In bypass mode, line in audio signal is pass directly to the output.
In TruBass mode, line in audio signal is enhanced with the TruBass algorithm.
The Bypass pin (pin 11) is used to select the operating mode. When the pin is forced to 0v, the chip is powered down and when
the pin is at float (or Vcc/2) and at 5v, the mode is set to Bypass and TruBass Enabled respectively.
An additional +6dB gain is enabled by pulling the pin TBGAIN to ground.
6 Speaker Size and Filter Center Frequencies selection
The configuration of the TruBass band-pass filters depends on the speaker size for the system. There are three configurations:
small, medium and large. Each configuration uses three bandpass filters, but with different center frequencies for the filters as
follows:
Speaker Size
Small
Medium
Large
Filter Center Frequencies
100Hz
60Hz
40Hz
The low pass filter cutoff frequency and the band pass filter center frequencies can be adjusted to match the frequency response of
the speakers being used. Generally, the speaker size setting should be selected so that the lowest of the band pass center
frequencies is just above the low cutoff frequency of the speaker system.
All configurations require the 100Hz filter, so its center frequency is fixed. The center frequencies of the other two filters are
configured by the external resistors placed on pins CB2, CB2A, CB2B, CB3, CB3A, CB3B.
Revision 2.4
3
15 April., 2002
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