Digital-to-analog converter having ladder network and improved i

Communications: electrical – Audible indication – Percussion-type sound producer

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H03K 1302

Patent

active

044686528

ABSTRACT:
A monolithic digital-to-analog converter integrated circuit is disclosed including a first plurality of more significant bit switches having scaled bit switch currents and including a second plurality of lesser significant bit switches, the output nodes of which are coupled to a ladder network which contributes a binary-weighted portion of each lesser significant bit switch current to the summed analog output current. First and second output conductors, separate and apart from one another, are used to couple the output nodes of the more significant bit switches and the output current of the ladder network, respectively, to the analog output current pad. First and second ground voltage pads are included for isolating waste current conducted by the more significant bit switches from currents returned by the ladder network to the ground voltage. The waste current nodes of the lesser significant bit switches are conducted to the same ground voltage pad that conducts the currents returned by the ladder network.

REFERENCES:
patent: 3890611 (1975-06-01), Pastoriza
patent: 4141004 (1979-02-01), Craven

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