Bit adjustment and filter circuit for digital-to-analog converte

Details Bit adjustment and filter circuit for digital-to-analog converte Bit adjustment and filter circuit for digital-to-analog converte

1985-05-08

1986-08-19

Shoop, Jr., William M.

Communications: electrical

Audible indication

Percussion-type sound producer

340347M, H03M 100

Patent

active

046072500

ABSTRACT:
A low voltage sixteen bit digital-to-analog converter operable between +5 and -5 volt power supplies and capable of providing output voltage levels to within about 1.4 volts of +V.sub.CC and -V.sub.CC includes a circuit for external adjustment of the bit current of a particular bit of the digital-to-analog converter, which circuit produces a constant adjustment current that is summed with that bit current over a wide range of processing parameters and temperature, and requires only a single terminal for connection of an external potentiometer by means of which the bit current is adjusted and a small value filter capacitor for filtering out noise generated by an internal zener diode voltage reference circuit.

REFERENCES:
patent: 3961326 (1976-06-01), Craven
patent: 4272760 (1981-06-01), Prazak et al.
patent: 4309693 (1982-01-01), Craven
patent: 4323795 (1982-04-01), Holloway et al.
patent: 4381497 (1983-04-01), Lillis et al.
patent: 4427973 (1984-01-01), Brokaw et al.
patent: 4492954 (1985-01-01), Harris et al.

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