MSM6234 查看數據表（PDF） - Oki Electric Industry

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MSM6234

DTMF Tone Dialer LSI

Oki Electric Industry 

¡ Semiconductor

MSM6234

SINGLE TONE INHIBIT

When more than two columns are selected against only one row, or when more than 2 rows are

selected against only one column, the single tone is output from the TONE OUT pin.

This SINGLE TONE INHIBIT pin is a negative logic input pin to control the output of the TONE OUT

pin in those cases. Refer to the Table-2.

When the input to this pin is high level, both of the single tone and dual tone are output from the

TONE OUT pin. When the input to this pin is low level, however, the single tone is prohibited to

output from the TONE OUT pin and becomes DC level.

This pin is provided with the pull-up resistor of 50 kW to 200 kW.

SINGLE TONE INHIBIT

VDD

50 kW to 200 kW

Pull up resistor

MSM6234RS

TONE OUT

The low group frequency and the high group frequency selected by the keyboard are synthesized

and output from this TONE OUT pin. Because the output form is the NPN open emitter style, the

load resistance must be connected externally. It is same for the case of the single tone output. The

output amplitude of the high group is bigger than that of the low group by 1 to 2 dB.

The distortion of the dual tone is maximum 10%.

VDD

VDD, VSS

VDD is a power supply.

VSS is ground.

MSM6234RS

TONE OUT

R

VSS

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