MT88E39AS Просмотр технического описания (PDF) - Mitel Networks

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MT88E39AS

Calling Number Identification Circuit

Mitel Networks 

Advance Information

MT88E39

Parameter

North America: Bellcore *1

Europe: ETSI *2

Mark (logical 1) frequency

1200 Hz +/- 1%

1300 Hz +/- 1.5%

Space (logical 0) frequency

Received signal level

2200 Hz +/- 1%

-36.20 to -4.23 dBm *3

(12 to 476 mVrms)

2100 Hz +/- 1.5%

-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

Notes:

*1: Recommended by TIA/EIA-716. Bellcore has agreed to the values and will incorporate them into its future standards.

*2: ETS 300 778-1 (On-hook) Sep 97, ETS 300 778-2 (Off-hook) Jan 97.

*3: dBm = Decibels above or below a reference power of 1mW into 600 ohms. 0dBm=0.7746Vrms.

*4: dBV = Decibels above or below a reference voltage of 1Vrms. 0dBV=1Vrms.

*5: On-hook signal range. The Off-hook signal levels are inside this range: -30.78 to -7.78 dBm.

Vdd

Vdd

Interrupt Source 1

INT1

(open drain)

Interrupt Source 2

R1

D1

R1 can be opened and

D1 shorted if the

microcontroller does not

read the INT1 pin.

Microcontroller

INT2

(CMOS)

Vdd

INT (input)

MT88E39

R2 *

DR

(Mode 0: Open Drain)

(Mode 1: CMOS

Input Port Bit

*R2 can be omitted if mode 1 is selected

Figure 7 - Application Circuit (multiple interrupt source)

5-7

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