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參數(shù)資料
| 型號： | SC88E43S |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | EXTENDED VOLTAGE CALLING NUMBER IDENTIFICATION CIRCUIT 2 |
| 中文描述： | 更廣的電壓主叫號碼識別電路2 |
| 文件頁數(shù)： | 13/25頁 |
| 文件大?。?/td> | 389K |
| 代理商： | SC88E43S |
Silan
Semiconductors
SC88E43
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0
2000.12.31
13
FSK Demodulation
The SC88E43 first bandpass filters and then demodulates the FSK signal. The carrier detector provides an
indication of the presence of signal at the bandpass filter output. The SC88E43’s dual mode 3-wire interface allows
convenient extraction of the 8-bit data words in the demodulated FSK bit stream.
Note that signals such as CAS/Tone Alert Signal, speech and DTMF tones lie in the same frequency band as
FSK. They will, therefore, be demodulated and as a result, false data will be generated. To avoid demodulation of
false data, an FSKen pin is provided so that the FSK demodulator may be disabled when FSK signal is not
expected. There are two events that if either is true, should be used to disable FSKen. The events are
CD
returning high or receiving all the data indicated by the message length word.
Item
BT
Bellcore
Mark frequency (logic 1)
Space frequency (logic 0)
1300Hz
±
1.5%
2100Hz
±
1.5%
-8dBV to –40dBV
(-5.78dBm to –37.78dBm)
-8dBV to –40dBV
1200Hz
±
1%
2200Hz
±
1%
Received signal level-mark
-12dBm
a
to –32dBm
Received signal level-space
-12dBm to –36dBm
Up to 10dB
b
≤
–25dBm (0-4kHz)
c
1200baud
±
1%
1 start bit (logic 0), 8 bit word
(LNB first), 1 stop bits (logic 1)
Signal level differntial (twist)
Up to 6dB
Unwanted signals
≤
-20dB (300-3400Hz)
1200baud
±
1%
1 start bit (logic 0), 8 bit word (LNB
first), 1 to 10 stop bits (logic 1)
Table 2 FSK Charateristics
Transmission rate
Word formate
a.The signal power is expressed in aBm referenced to 600
at the CPE tip/ring (A/B) interface.
b.SR-3004, Issue 2, January 1995.
c.The frequency range is specified in GR-30-CORE.
d.Up to 20 marks may be inserted in specific places in a single or multiple data message.
The FSK characteristics described in Table 2 shows the BT and Bellcore specifications. The BT frequencies
correspond to CCITT v.23. The Bellcore frequencies correspond to Bell 202. The U.K.’s CCA requires that the TE
be able to receive both CCITT v.23 and Bell 202 formats. The SC88E43 is compatible with both formats without
any adjustment.
3-wire FSK Data Interface
The SC88E43 provides a powerful dual mode 3-wire interface so that the 8-bit data words in the demodulated
FSK bit stream can be extracted without the need either for an external UART or for the TE/CPE’s microcontroller
to perform the UART function in software. The interface is specifically designed for the 1200 baud rate and is
comprised of the DATA, DCLK (data clock) and
DR
(data ready) pins. Two modes (modes 0 and 1) are selectable
via control of the device’s MODE pin: in mode 0, data transfer is initiated by the SC88E43; in mode 1, data transfer
is initiated by the external microcontroller.
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