MT88E39
Parameter
Mark (logical 1) frequency
Space (logical 0) frequency
Received signal level
Reject signal level
Transmission rate
Twist
Signal to noise ratio
North America: Bellcore
*1
1200 Hz +/- 1%
2200 Hz +/- 1%
-36.20 to -4.23 dBm
*3
(12 to 476 mVrms)
-48.23 dBm (3 mVrms)
(VMWI only)
1200 baud +/- 1%
-6 to +10 dB
Single tone (f):
-18 dB (f<=60 Hz)
-12 dB (60<f<=120 Hz)
-6 dB (120<f<=200 Hz)
+25 dB (200<f<3200 Hz)
+6 dB (f>=3200 Hz)
0 dB
Data Sheet
Europe: ETSI
*2
1300 Hz +/- 1.5%
2100 Hz +/- 1.5%
-33.78 to -5.78 dBm
(-36 to -8 dBV
*4
)
*5
-47.78 dBm (-50 dBV)
1200 baud +/- 1%
-6 to +6 dB
>= 25 db
(300 to 3400 Hz)
MT88E39 FSK input gain
for Vdd = 5 V +/-10%
Note:
*1:
*2:
*3:
*4:
*5:
-2.5 dB
Table 1 - FSK signal characteristics specified by some standard bodies
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 1 mW into 600 ohms. 0 dBm = 0.7746 Vrms.
dBV = Decibels above or below a reference voltage of 1 Vrms. 0 dBV = 1 Vrms.
On-hook signal range. The Off-hook signal levels are inside this range: -30.78 to -7.78 dBm.
Vdd
Interrupt Source 1
INT1
(open drain)
R1 can be opened and
D1 shorted if the
microcontroller does not
read the INT1 pin.
Interrupt Source 2
INT2
(CMOS)
INT (input)
Vdd
MT88E39
DR
(Mode 0: Open Drain)
(Mode 1: CMOS
Input Port Bit
*R2 can be omitted if mode 1 is selected
R2 *
R1
D1
Vdd
Microcontroller
Figure 7 - Application Circuit (multiple interrupt source)
8
Zarlink Semiconductor Inc.
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
