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SM6800AB データシート(PDF) 8 Page - Nippon Precision Circuits Inc

部品番号 SM6800AB
部品情報  Class-D Mono Amplifier for Mobile Telephones
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メーカー  NPC [Nippon Precision Circuits Inc]
ホームページ  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM6800AB データシート(HTML) 8 Page - Nippon Precision Circuits Inc

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SM6800A
NIPPON PRECISION CIRCUITS INC.—8
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.
The frequency response of the equalizer circuit is given by the following equation, where
ƒ is the frequency.
Dynamic Range Compression Mode (TM1, TM2)
The dynamic range compression mode is selected by the state of the TM1 and TM2 inputs. When a compres-
sion mode is used, the gain for small input signals is increased while large input signals are converted using a
curve that performs soft-clipping. This increases the average sound pressure level emitted from the speaker
during playback.
Dynamic range compression
mode
TM1
TM2
Effect
OFF
L
L
No effect
1
H
L
Small effect
2
L
H
Medium effect
3
H
H
Large effect
EQN
VREF1
EQP 3
4
R04
R03 C03
C04
R01
60k
R02 C02
60k
IN
2
C01
IN'
+
Response =
20 × log
10
[dB]
11
60000
1
R04
++
+ 2πƒC04
1
2
πƒC03
R03
+
+
1
2
πƒC01
1
1
60000
1
R01
+
1
+
1
2
πƒC02
R02
+
1


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