ML7020 データシートの表示（PDF） - Oki Electric Industry

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ML7020

1200 bps MODEM for Remote Control Systems

Oki Electric Industry 

1Semiconductor

FEDL7020-02

ML7020

• SW1CONT

This is the switch for selecting the DTMF reception input.

0: The input amplifier 1 is connected to the DTMF reception circuit.

1: The input amplifier 2 is connected to the DTMF reception circuit.

• SW2CONT

This is the switch for selecting the modem reception and CPT detection inputs.

0: The input amplifier 2 is connected to the modem reception circuit and the CPT detection circuit.

1: The input amplifier 3 is connected to the modem reception circuit and the CPT detection circuit.

• SW3CONT

This is the switch for external circuits, and can be used for connecting the termination, etc.

0: The switch goes into the OFF state.

1: The switch goes into the ON state. (The SWI pin and the SGO pin are connected together.)

• SW4CONT

This is the switch for selecting the signal (TO) of the output amplifier 1.

0: The CPT transmit output is connected to the output amplifier 1.

1: The output signal of SW2 is connected to the output amplifier 1.

• SW5CONT

This is the switch for selecting the signal (LO–, LO+) of the output amplifier 2.

0: The DTMF transmit output is connected to the output amplifier 2.

1: The modem transmit output is connected to the output amplifier 2.

Set this to “1” during the modem transmit mode and set this to “0” during the DTMF transmit mode.

• CPTG_ON

This register is used for the ON/OFF control of call progress tone transmission.

0: CPT transmission becomes OFF and the signal is not output.

1: CPT transmission becomes ON and the signal is output.

• CPT800

This selects the frequency of call progress tone transmission.

0: A 400 Hz signal is output.

1: An 800 Hz signal is output.

• MOD-DT_ON

This is used for the ON/OFF control of modem transmission or DTMF transmission.

The transmission function is made ON/OFF of the block corresponding to the selected mode.

0: Modem transmission or DTMF transmission become OFF and the signal is not output.

1: Modem transmission or DTMF transmission become ON and the signal is output.

In the DTMF transmission mode or in the DTMF loop back mode, PBG3 to 0 are latched at the rising edge of

MOD-DT_ON.

Set this to “0” during the modem reception mode and the tone 1 mode.

• ATT

This controls the attenuator of the DTMF transmission section.

0: No attenuator is inserted. The DTMF transmit signal is output as it is.

1: A –6 dB attenuator is inserted in the DTMF transmission section.

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