MT8870D Ver la hoja de datos (PDF) - Mitel Networks

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componentes Descripción

Fabricante

MT8870D

ISO2-CMOS 3 Volt Integrated DTMF Receiver

Mitel Networks 

MT88L70

DTMF

Input

C1

R1

R2

X-tal

VDD

MT88L70

IN+

IN-

GS

VRef

INH

PDWN

OSC1

OSC2

VSS

VDD

St/GT

ESt

StD

Q4

Q3

Q2

Q1

TOE

C2

R3

NOTES:

R1, R2 = 100 kΩ ±1%

R3 = 300 kΩ ±1%

C1,C2 = 100 nF ±5%

X-tal = 3.579545 MHz ±0.1%

VDD = 3.0V + 20% / -10%

Figure 6 - Single-Ended Input Configuration

the input pins are connected as shown in Figure 6

with the op-amp connected for unity gain and VRef

biasing the input at 1/2VDD. Figure 5 shows the

differential configuration, which permits the

adjustment of gain with the feedback resistor R5.

Crystal Oscillator

Applications

A single-ended input configuration is shown in Figure

6. For applications with differential signal inputs the

circuit shown in Figure 5 may be used.

The internal clock circuit is completed with the

addition of an external 3.579545 MHz crystal and is

connected as shown in Figure 6 (Single-ended Input

Configuration).

4-27

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