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參數(shù)資料
| 型號(hào)： | ST75C540FP-A |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | SUPER INTEGRATED DEVICESWITH DSP, AFE & MEMORIES FORTELEPHONY,MODEM, FAXOVERINTERNET& POTSLINES |
| 中文描述： | 超級(jí)綜合DEVICESWITH數(shù)字信號(hào)處理器，模擬前端 |
| 文件頁(yè)數(shù)： | 79/84頁(yè) |
| 文件大?。?/td> | 599K |
| 代理商： | ST75C540FP-A |
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XVIII - PCB DESIGN GUIDELINES
Performancesof the FAX modem dependson the
ST75C530/540intrinsic performances and on the
proper PC board layout.
All aspectsof the properengineeringpractices,for
PC board design, are beyond the scope of this
paragraph.
We recommend the following points:
- in a 4-layerPC board : Separateddigital ground
and analog ground, connected together at one
point,as closeaspossibleto theST75C530/540,
- in a 2-layer PC board: Providea groundgridin all
spacearoundandundercomponentsonbothsides
of the band and connect to avoid small islands,
- both AGNDR and AGNDT must be connected
with very low impedance to a single point, (see
Chapter I.6, Power Supply),
- the four 2.2nF capacitors connected to the RxA
and MIC1,MIC2, MIC3 Pinsmust be ascloseas
possibleto them,
- thetwo100nFcapacitorsconnectedtotheV
REFP
and
V
REFN
pinsmustbeascloseaspossibletothem,
- analog and digital supplies must be connected
together,at a singlepoint,ascloseas possibleto
the chip.
15
ADC
MUTE
DAC
Line
HYBRID
TxA1
TxA2
RxA
ADC
14
11
10 MIC3
8
MIC1
9
MIC2
79SPK2
78
MUTE
77
SPK3
76
MUTE
2
SPK1
1
MUTE
[0..-30]dB
Step 3dB
DAC
ATT_SPK
ATT_LOC
ATT_TX
4 TONES
GENERATOR
DG
DTMF
DETECTOR
16 TONE
DETECTORS
4 TONE
DETECTORS
V.21 FLAG
DETECTOR
RING
DETECTOR
DUAL
RAM
INTERFACE
DG
Programmable
Attenuation
Addition
of Signals
Automatic
Gain
7
Figure 49 :
ToneMode (TONE)
15
ADC
MUTE
DAC
Line
HYBRID
TxA1
TxA2
RxA
ADC
14
11
10 MIC3
8
MIC1
9
MIC2
79SPK2
78
MUTE
77
SPK3
76
MUTE
2
SPK1
1
MUTE
[0..-30]dB
Step 3dB
DAC
ATT_SPK
ATT_LOC
ATT_TX
4 TONES
GENERATOR
DG
DTMF
DETECTOR
6 TONE
DETECTORS
4 TONE
DETECTORS
V.21 FLAG
DETECTOR
UART
DUAL
RAM
INTERFACE
DG
Programmable
Attenuation
Addition
of Signals
Automatic
Gain
RING
DETECTOR
V.23
DEMODULATOR
7
Figure 50 :
ToneMode with Caller ID (TONECID)
XIX- APPENDIXA :
MODES OF OPERATION
ST75C530- ST75C540
79/84
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
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