MT88E41 Ver la hoja de datos (PDF) - Zarlink Semiconductor Inc

Número de pieza

componentes Descripción

Fabricante

MT88E41

CMOS Extended Voltage Calling Number Identification Circuit (ECNIC)

Zarlink Semiconductor Inc 

Data Sheet

MT88E41

2.0

Applications

The circuit shown in Figure 6 illustrates the use of the MT88E41 device in a typical FSK receiver system. Bellcore

Special Report SR-TSV-002476 specifies that the FSK receiver should be able to receive FSK signal levels as

follows:

Received Signal Level at 1200Hz:

-32dBm to -12dBm

Received Signal Level at 2200Hz:

-36dBm to -12dBm

This condition can be attained by choosing suitable values of R1 and R2. The MT88E41 configured in a unity gain

mode as shown in Fig. 6 meets the above level requirements.

For applications requiring detection of lower FSK signal level, the input op amp may be configured to provide

adequate gain.

VDD

C1

R1

R2

C2

Notes:

R1, R2 = 100 kΩ 1%

R3, R4 = 100 kΩ 10%

C1, C2, C3 = 0.1µF 20%

X-tal = 3.579545 MHz

X-tal

MT88E41

IN +

IN -

GS

VRef

CAP

OSC1

OSC2

VSS

VDD

IC2

IC1

PWDN

CD

DR

DATA

DCLK

C3

R3

R4

Figure 6 - Application Circuit (Single-Ended Input)

To

Controller

SEMICMF.019

7

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