參數(shù)資料
型號: MT88E39
廠商: Mitel Networks Corporation
英文描述: CMOS Calling Number Identification Circuit(CNIC1.1)
中文描述: 主叫號碼識別的CMOS電路(CNIC1.1)
文件頁數(shù): 7/14頁
文件大?。?/td> 98K
代理商: MT88E39
Advance Information
MT88E39
5-7
Notes:
*1:
*2:
*3:
*4:
*5:
Recommended by TIA/EIA-716. Bellcore has agreed to the values and will incorporate them into its future standards.
ETS 300 778-1 (On-hook) Sep 97, ETS 300 778-2 (Off-hook) Jan 97.
dBm = Decibels above or below a reference power of 1mW into 600 ohms. 0dBm=0.7746Vrms.
dBV = Decibels above or below a reference voltage of 1Vrms. 0dBV=1Vrms.
On-hook signal range. The Off-hook signal levels are inside this range: -30.78 to -7.78 dBm.
Figure 7 - Application Circuit (multiple interrupt source)
Parameter
North America: Bellcore
*1
Europe: ETSI
*2
Mark (logical 1) frequency
1200 Hz +/- 1%
1300 Hz +/- 1.5%
Space (logical 0) frequency
2200 Hz +/- 1%
-36.20 to -4.23 dBm
*3
(12 to 476 mVrms)
2100 Hz +/- 1.5%
Received signal level
-33.78 to -5.78 dBm
(-36 to -8 dBV
*4
)
*5
Reject signal level
-48.23 dBm (3 mVrms)
(VMWI only)
-47.78 dBm (-50 dBV)
Transmission rate
1200 baud +/- 1%
1200 baud +/- 1%
Twist
-6 to +10 dB
-6 to +6 dB
Signal to noise ratio
Single tone (f):
-18 dB (f<=60Hz)
-12 dB (60<f<=120Hz)
-6 dB (120<f<=200Hz)
+25 dB (200<f<3200Hz)
+6 dB (f>=3200Hz)
>= 25 db
(300 to 3400 Hz)
MT88E39 FSK input gain
for Vdd=5V +/-10%
0 dB
-2.5 dB
Table 1 - FSK signal characteristics specified by some standard bodies
Interrupt Source 1
Interrupt Source 2
MT88E39
Vdd
Vdd
*R2 can be omitted if mode 1 is selected
R2 *
R1
Vdd
INT (input)
Microcontroller
Input Port Bit
R1 can be opened and
D1 shorted if the
microcontroller does not
read the INT1 pin.
D1
INT1
(open drain)
INT2
(CMOS)
DR
(Mode 0: Open Drain)
(Mode 1: CMOS
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