MT88E45BSR Просмотр технического описания (PDF) - Zarlink Semiconductor Inc

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MT88E45BSR

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

Zarlink Semiconductor Inc 

MT88E45

IN+

C

RIN

IN-

Voltage Gain

RF

(AV) = RF / RIN

Highpass Corner Frequency

f-3dB = 1/(2πRINC)

GS

VREF

Figure 3 - Single Ended Input Configuration

Data Sheet

C1 R1

IN+

IN-

C2 R4

R5

GS

R3

R2

Differential Input Amplifier

C1 = C2

R1 = R4 (For unity gain R5= R4)

R3 = (R2R5) / (R2 + R5)

VREF

Voltage Gain

(AVdiff) = R5/R1

Highpass Corner Frequency

f-3dB = 1/(2πR1C1)

Input Impedance

(ZINdiff) = 2 R12 + (1/ωC)2

Figure 4 - Differential Input Configuration

CAS Detection

In North America, CAS is used in off-hook signalling only. In Europe (ETSI) it is used in off-hook signalling, and by

BT in both on and off-hook signalling. ETSI calls it the Dual Tone Alerting Signal (DT-AS). Although the ETSI on-

hook standard contains a DT-AS specification, BT is the only administration known to employ CAS in on-hook

signalling. (BT calls it Tone Alert Signal.) The CAS/DT-AS characteristics are summarized in Table 3.

2130 Hz and 2750 Hz

CAS/DT-AS Characteristics

Frequency Tolerance

Signal Level (per tone)

Reject Level (per tone)

Maximum Twist (V2130Hz/V2750Hz)

Bellcorea

(Off-hook only)

+/-0.5%

-14 to -32 dBmd

-45 dBm

+/-6 dB

ETSIb

(Off-hook)

+/-0.5%

-9.78 to -32.78 dBm

(-12 to -35 dBVe)

+/-6 dB

BTc

(Off-hook = ‘Loop State’)

(On-hook = ‘Idle State’)

Off-hook: +/-0.6%

On-hook: +/-1.1%

+0.22 to -37.78 dBm

(-2 to -40 dBV)

On-hook: -43.78 dBm

(-46 dBV)

+/-7 dB

8

Zarlink Semiconductor Inc.

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