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Text: F U J I TS U M I C R O E L E C T R O N I C S 47E D • 3 7 4 tì7bE 0 0 1 6 55 5 fl ■ F U I - 7 75 2 7 " 0 7 ^ ''- r l ir a m i , May 1991 FUJITSU E m io n 2 - ° DATA SHEET MB87057 DTMF RECEIVER DUAL TONE MULTI FREQUENCY RECEIVER The MB87057 is a one chip DTMF receiver with an input amplifier gain adjuster and