LC75055PE(2014) Просмотр технического описания (PDF) - ON Semiconductor
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LC75055PE Datasheet PDF : 26 Pages
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LC75055PE
2) Monaural ADC input
Audio system ADC for interrupt sound (INTA/INTB) has the amplifier which can set a gain for a source selector of
the single-end input/differential input and each input individually. The gain setting of INTA/INTB is settable every
each input source. The range of the gain is -12 to +19dB (1dB steps), and set from the outside.
In addition, perform mute processing by all means because the noise outbreak is possible at the time of the gain
setting change. About the method of the gain setting change, it is appointed on software specifications.
By a number and the kind of the interrupt sound, the following combination is enabled.
Combination
single end input
differential input
Single end: 3
Differential: 1
MIN2N
MIN2P
MIN3
MIN1P, MIN1N
Single end: 1
Differential: 2
MIN3
MIN1P, MIN1N
MIN2P, MIN2N
About the method of these setting, it is appointed on software specifications.
(i) Single end input: 3, differential input: 1
(ii) Single end input: 1, differential input: 2
Differential input (MIN1)
Single end (MIN4)
Single end (MIN5)
Single end (MIN3)
MIN1N
MIN1P
MIN2P
MIN2N
MIN3
Differential input (MIN1)
Differential input (MIN2)
Single end (MIN3)
MIN1N
MIN1P
MIN2P
MIN2N
MIN3
(10) Internal digital filter characteristic in A/D and D/A converter block
1) A/D converter block
ADC Digtal Filter Frequency Response
0
-20
-40
-60
-80
-100
-120
-140
0
1
2
3
4
Frequency [×fs]
ADC Digtal Filter Frequency Response (passband)
0.2
0.15
0.1
0.05
0
-0.05
-0.1
-0.15
-0.2
0
5
10
15
20
Frequency [kfs] (fs=44.1kHz)
2) D/A converter block (8- TIMES OVER SAMPLING DIGITAL FILTER)
0
-20
-40
-60
-80
-100
-120
-140
0
ADC Digtal Filter Frequency Response
0.5
1
1.5
2
2.5
3
3.5
4
Frequency [fs]
0
-0.01
-0.02
-0.03
-0.04
-0.05
-0.06
-0.07
-0.08
-0.09
-0.1
0
ADC Digtal Filter Ripple
5
10
15
20
Frequency [kfs] (fs=44.1kHz)
No.A2168-19/26
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