ML7005 Просмотр технического описания (PDF) - Oki Electric Industry

Номер в каталоге

Компоненты Описание

производитель

ML7005

DTMF Transceiver

Oki Electric Industry 

¡ Semiconductor

ML7005

FUNCTIONAL DESCRIPTION

Oscillation Circuit

The X1 and X2 should be connected by a 3.579545 MHz crystal.

When the load capacitance of the crystal is 16pF, X1 and GND should be connected by a 20 pF

capacitor, and X2 and GND also should be connected by a 20 pF capacitor.

If necessary, an external clock should be input to X1 via a 1000 pF capacitor, and X2 should be

left open.

C1

X1

3.579545MHz

X1

3.579545MHz

X2

X2

C2

Figure 6 Crystal Connection

Figure 7 External Clock Connection

DTMF Receiver, CPT Detector Input Level Adjustment

Adjust the input level according to the method shown in the figure 8.

Determine the value of a usable resistor so that the levels of the outputs (DTIO, CPDIO) of each

amplifier at a maximum input level are less than the maximum detect level described in the AC

Characteristics.

CA

IN

DTRIP

DTRIM

(CPDIP)

+

–

(CPDIM)

DTRIO (CPDIO)

RB

RA

RC

SG

RA ≥ 100 kW

RB, RC ≥ 50 kW

CA ≥ 0.1 mF

Gain = 1 + RB £ 10

RC

CA RD

IN

DTRIO

RE

(CPDIO)

DTRIM

DTRIP

SG

(CPDIM)

–

+

(CPDIP)

Gain = RE £ 10

RD

Figure 8 DTMF, CPT Input Level Adjustment

19/24

Share Link: