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ST75C540 Datasheet(PDF) 77 Page - STMicroelectronics

Part # ST75C540
Description  SUPER INTEGRATED DEVICESWITH DSP, AFE & MEMORIES FORTELEPHONY,MODEM, FAXOVERINTERNET& POTSLINES
PDF  84 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST75C540 Datasheet(HTML) 77 Page - STMicroelectronics

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XV - DEFAULT CALL PROGRESS TONE DETECTORS
0
-10
-20
-30
-40
-50
0
200
400
600
800
1000
dB
no detection
detection
step = 10Hz
reference level = 0dB
f (Hz)
Figure 44 : Call Progress Tone Detector Band 1
0
-10
-20
-30
-40
-50
2000
2040
2080
2120
2160
2200
f (Hz)
no detection
detection
dB
reference level = 0dB
step = 10Hz
Figure 46 : 2100Hz Answer Tone Detector
0
-10
-20
-30
-40
-50
200
320
440
560
680
800
f (Hz)
no detection
detection
dB
step = 10Hz
reference level = 0dB
Figure 47 : 440Hz Tone Detector
0
-8
-16
-24
-32
-40
0
720
1440
2160
2880
3600
f (Hz)
no detection
detection
dB
step = 100Hz
reference level = 0dB
Figure 45 : Call Progress Tone Detector Band 2
XVI - DEFAULT ANSWER TONE DETECTORS
ST75C530 - ST75C540
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