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SM6801A Datasheet, PDF (10/16 Pages) Nippon Precision Circuits Inc – Class-D Mono Amplifier for Portable Device | |||
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SM6801A
Input Equalizer (IN, EQP, EQN)
An input equalizer network can be connected to pins IN, EQP and EQN, as shown in the input equivalent cir-
cuit and equalizer circuit below.
C01
IN'
R01
R02 C02
R04
R03 C03
C04
EQP 5
EQN 6
60k
4
IN
60k
â
+
VREF1
The frequency response of the equalizer circuit is given by the following equation, where Æ is the frequency.
1
1+
1
+ 1 + 2ÏÆC04
60000 R03 + 1
R04
2ÏÆC03
Response = 20 Ã log10
[dB]
1+
1
2ÏÆC01
1 +1+
1
60000 R01 R02 + 1
2ÏÆC02
Dynamic Range Compression Mode (DRCN)
The dynamic range compression mode is set when DRCN is LOW. When a compression mode is used, the gain
for small input signals is increased while large input signals are converted using a curve that performs soft-clip-
ping. This increases the average sound pressure level emitted from the speaker during playback.
-40 -35 -30 -25 -20 -15 -10 -5 0 5 10
10
5
DRC mode
0
-5
-10
-15
-20
normal mode
-25
-30
-35
-40
Input [dBV]
SEIKO NPC CORPORATION â10
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