ML7005 Просмотр технического описания (PDF) - Oki Electric Industry

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производитель

ML7005

DTMF Transceiver

Oki Electric Industry 

¡ Semiconductor

ML7005

Adjusting the Analog Output Level

Adjust the analog output level according to the method shown in the figure 11.

RI/RH ≤ 1.6 is always required when VDD ≥ 4.5 V.

In the case of RI /RH > 1, if RI /RH = A, the maximum analog output load resistance is 20*A (kW).

If VDD is less than 4.5 V, RI/RH ≤ 1 is required.

DTGO (CPDGO)

RH

DTAI (CPAI)

–

+

Generator

RI

DTAO (CPAO)

OUT

Gain = RI

RH

Figure 11 Analog Output Level Adjustment

Concurrent Operation of 4 Functions

The DTMF signal generator, DTMF signal detector, call progress tone generator, and call

progress tone detector can operate concurrently.

When both the DTMF signal generator and call progress tone generator operate concurrently, the

DTMF signal sometimes cannot be detected if the receive level of the DTMF signal is less than

-36 dBm.

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