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參數(shù)資料
| 型號(hào)： | ST7536CFN |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | POWER LINE MODEM |
| 中文描述： | 電力線調(diào)制解調(diào)器 |
| 文件頁(yè)數(shù)： | 4/9頁(yè) |
| 文件大小： | 100K |
| 代理商： | ST7536CFN |
FUNCTIONAL DESCRIPTION
1 - TransmitSection
The transmitmode is set whenRx/Tx = 0, if Rx/Tx
isheldat0longerthan3s, thenthedeviceswitches
automatically in the Rx mode. A new activation of
the Txmode requiresRx/Tx to be returnedto 1 for
a minimum2
μ
s periodbefore being set to 0.
The TransmitData (TxD) is sampled on a positive
edge of CLR/Twhich deliversthe transmitbitclock
when the transmit mode is selected. This data
entersa FSKmodulatorwhose twobasicfrequen-
cies are selected by the Baud Rate Selection pin
(BRS) and the Channel Selection pin (CHS) ac-
cordingto the Table1.
CLR/T
TxD
DATA VALID
7
Figure 1 :
Tx Data Input Timing
Table1
BRS
CHS
Baud Rate
(Baud)
600
600
1200
1200
Tx Frequencies (kHz)
TxD=1 - TxD=0
81.75 - 82.35
67.2 - 67.8
71.4 - 72.6
85.95 - 87.15
0
0
1
1
0
1
0
1
These frequencies are synthesized from a
11.0592MHzcrystaloscillator; theirprecisionisthe
sameas the crystal one’s (100 ppm).
ThemodulatedsignalcomingoutoftheFSKmodu-
lator is filtered by a switched-capacitorband-pass
filter (Tx band-pass) in order to limit the output
spectrumandtoreducethe levelof harmoniccom-
ponents.
The output stage of the Tx path consists of an
AutomaticLevelControl(ALC)systemwhich keeps
the output signal (ATO) amplitude independant of
thelineimpedancevariations.ThisALCisa variable
gain system (with 32 discrete values) controlled by
ananalogfeed-backsignalALCI (seeFigure 2).
The ALC gain range is 0dB to -26dB and gain
change is clocked at 7200Hz. Gain steps are of
magnitude0.84dBtypically.
Aperiod of thisclock is decomposedinto a 34.7
μ
s
gain settlinglatency and a 104.2
μ
s peakdetecting
time. The gain change is related to the result of a
peak detection obtained by making a direct com-
parison of ALCI maximum value (during detecting
time)with two thresholdvoltagesV
T1
andV
T2
(see
Figure2).
- max (VALCI) < V
T1
- The next gain is increased
by 0.84dB,
- V
T1
≤
max(VALCI)
≤
V
T2
- No gain change,
- V
T2
< max(VALCI) - The next gain is decreased
by 0.84dB.
Amplitude
modification
due to an
external cause
High Gain
Low Gain
Correct Gain
Correct
Gain
l
μ
s
G
P
t
μ
s
VT2
VT1
ALCI SIGNAL ENVELOP
ALCCLOCK
7
Figure 2 :
AutomaticLevel ControlTiming Chart
ST7536
4/9
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PDF描述 |
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| ST7537 | MOSFET; Transistor Polarity:P Channel; Drain Source Voltage, Vds:-30V; Continuous Drain Current, Id:-11.4A; On-Resistance, Rds(on):0.019ohm; Package/Case:8-SOIC |
| ST7537HS1 | HOME AUTOMATION MODEM |
| ST7538 | POWER LINE FSK TRANSCEIVER |
| ST7538P | POWER LINE FSK TRANSCEIVER |
| ST7554 | V.90 USB WORLD MODEM CONTROLLER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST7537 | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:HOME AUTOMATION MODEM |
| ST7537HS1 | 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:HOME AUTOMATION MODEM |
| ST7537HS1CFN | 功能描述:電信線路管理 IC 1/2 Dup Async Modem RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類(lèi)型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| ST7537HS1CFNTR | 功能描述:電信線路管理 IC 1/2 Dup Async Modem RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類(lèi)型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| ST7538 | 制造商:STMicroelectronics 功能描述:HALF DUPLEX SYNCHRONOUS/ASYNCHRONOUS FSK MODEM - Bulk |
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