參數(shù)資料
型號(hào)： AN17000A
廠商： PANASONIC CORP
元件分類(lèi)： 音頻控制
英文描述： Audio signal processing IC for notebook PC
中文描述： 2 CHANNEL(S), TONE CONTROL CIRCUIT, PDSO56
封裝： 0.300 INCH, 1 MM HEIGHT, HEAT SINK, PLASTIC, TSOP-56
文件頁(yè)數(shù)： 16/25頁(yè)
文件大?。?/td> 351K
代理商： AN17000A
AN17000A
16
SDC00042BEB
I
Applicaon Notes
1. Pin descriptions
Pin 1 (power supply for R-ch. speaker power use)
Please put a capacitor of about 47
μ
F between pin 1 and pin 5.
Pin 2, pin 3 (R-ch. speaker output) (BTL out)
Pin 4 (N.C.)
Pin 5 (GND for R-ch. speaker power use)
Pin 6, pin 45, pin 46, pin 47, pin 48, pin 49 (bass boost)
Following equivalent circuit is for bass boost.
7
20 k
8
6
45
46
20 k
47
48
49
10 k
R-ch.
speaker input
L-ch.
speaker input
LPF1
Amplifier
LPF2
DC cut
To speaker
power amplifier
C22
C28
C20
C2
R9
VR4
1) Pin 6
This pin makes first LPF together with internal registors.
When a value of C2 is 0.033
μ
F, cutoff frequency is 500 Hz.
2) Pin 45, pin 46
This gain is
G
V
=
VR4
+
R9
R9
It is necessary that VR4
=
3.9 k
, R9
=
1 k
for amplifier gain of five times.
The HPF is composed with R9 and C20, then if R9 is 1 k
, suitable value of C20 is 3.3
μ
F.
3) Pin 47
This pin makes second LPF together with internal registors.
When a value of C21 is 0.033
μ
F, cutoff frequency is 500 Hz.
4) Pin 48, pin 49
This purpose is DC cut. Suitable value of C22 is 10
μ
F (bipolar), because input impeadance of speaker power
amplifier is 2 k
.
Pin 7, pin 8 (L-ch., R-ch. speaker input)
If no resistors are connected to pin 7 and pin 8 from previous stage, the BTL output has the gain of 40 times.
If input of 1.4/40 V[rms] or more is possibly inputted, the input should be attenuated by connecting resistors to pin
7 and pin 8 from previous stage because the output dynamic range is about 1.4 V[rms].
The gain at BTL output is 2 k
/(R1
+
2 k
)
×
40, where R1 and R2 are the resistance of resistors of connected
to pin 7 and pin 8 from the previous stage and R1
=
R2.
Supposing that max output level of headphone is 1 V[rms], suitable value of R1 and R2 is 25 k
, because gain
of speaker power amplifier is 32 dB.
Pin 9 (ripple filter of speaker amplifier)
Recommended value is 1
μ
F.
If capacitor value is bigger, rise time at standby is longer.
If capacitor value is smaller, rise time at stanby is shorter, but there are possibilities of pop sound occurrence
and deterioration of power supply ripple rejection, cross talk and THD.
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