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MT88E45B

4-Wire Calling Number Identification Circuit 2 (4-Wire CNIC2)

Zarlink Semiconductor Inc 

Data Sheet

MT88E45B

Parameter

North America: Bellcorea

Europe: ETSIb

UK: BTc

Mark (Logical 1) Frequency

1200 Hz +/- 1%

1300 Hz +/- 1.5%

Space (Logical 0) Frequency

Received Signal Level

2200 Hz +/- 1%

-4.23 to -36.20 dBm

(476 to 12 mVrms)d

2100 Hz +/- 1.5%

-5.78 to -33.78 dBme -5.78 to -37.78 dBm

(-8 to -36 dBV)f,g

(-8 to -40 dBV)

Signal Reject Level

-48.24 dBm (3mVrms) for

On-hook No Ring Signalling

such as VMWI

On-hook only:

-47.78 dBm

(-50dBV)

Transmission Rate

1200 baud +/- 1%

1200 baud +/- 1%

Twist (VMARK/VSPACE)

Signal to Noise Ratio

Tip/Ring Op-Amp (GS1) Gain

Vdd = 5V +/- 10%

Tip/Ring Op-Amp (GS1) Gain

Vdd = 3V +/- 10%

-6 to +10 dB

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)

0 dB

-3.5 dB

-6 to +6 dB

>= 25 dB

(300 to 3400 Hz)

>= 20 dB

(300 to 3400 Hz)

-2 dBh

-5.5 dBi

0 dB

-3.5 dB

a. ANSI/TIA/EIA-716 and TIA/EIA-777. Bellcore has agreed to the values and will synchronize its requirements.

b. ETS 300 778-1 (On-hook) Sep 97, ETS 300 778-2 (Off-hook) Jan 98.

c. SIN 227 Issue 3 Nov 97, SIN242 Issue 2 Nov 96.

d. North American on-hook signalling range. The off-hook range is inside the on-hook range: 190mVrms to 12mVrms.

e. dBm - Decibels above or below a reference power of 1 mW into 600 ohms. 0 dBm = 0.7746 Vrms

f. dBV - Decibels above or below a reference voltage of 1 Vrms. 0 dBV = 1 Vrms.

g. ETSI on-hook signalling range. The off-Hook signalling levels are inside this range: -8.78 to -30.78 dBm (-11 to -33 dBV).

h. The 5V ETSI Tip/Ring op-amp gain can be 0 dB if there is no FSK reject level requirement.

i. The 3V ETSI Tip/Ring op-amp gain can be -3.5dB if there is no FSK reject level requirement.

Table 4 - FSK Signal Characteristics

FSK Demodulation

The FSK characteristics are shown in Table 4. In

North America, TIA (Telecommunications Industry

Association) also sets standards. The Type 1 Caller

ID CPE standard is ANSI/TIA/EIA-716. The Type 2

standard is TIA/EIA-777. The North American FSK

characteristics in Table 4 are from ANSI/TIA/EIA-

716. They differ from those Bellcore published in SR-

TSV-002476 and SR-3004. Bellcore is represented

in TR41.3.1 and will synchronize to the TIA

requirements in its future documents.

The TIA Type 1 standard includes an FSK reject

level:

• if data is not preceded by ringing (e.g. VMWI),

FSK signals below 3mVrms (-48.24 dBm) shall

be rejected

• if data is preceded by ringing, FSK detection

may be extended below 3mVrms

The MT88E45B is compliant with the Bellcore/TIA,

ETSI and BT requirements with the Tip/Ring op-amp

gains in Table 4. In Europe if the country specific

FSK requirements do not incorporate ETSI’s FSK

reject level then the Tip/Ring op-amp gain can also

be 0dB at 5V and -3.5dB at 3V to meet the ETSI

minimum CAS level for on-hook signalling (-40 dBV).

For 3V operation, the FSK receiver becomes more

sensitive and lower level signals will be accepted

than at 5V. To maintain the FSK reject level, the Tip/

Ring input op-amp gain should be reduced. Note that

since the Tip/Ring op-amp is also used for Tip/Ring

CAS detection, the CAS level will also be reduced for

on-hook detection.

FSK Data Interface

The MT88E45B provides a powerful dual mode 3-

wire interface so that the data bytes in the

demodulated FSK bit stream can be extracted

without the need either for an external UART or for

the CPE’s microcontroller to perform the function in

9

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