Single-supply ic digital-to-analog converter for use with...

Details Single-supply ic digital-to-analog converter for use with... Single-supply ic digital-to-analog converter for use with...

H - Electricity

03

M

354/101, 330/35

H03M 1/66 (2006.01) H03F 1/32 (2006.01) H03F 1/34 (2006.01) H03M 1/00 (2006.01)

Patent

CA 1192312

ABSTRACT OF THE DISCLOSURE A single-chip 8-bit DAC with bipolar current sources, an output buffer amplifier for developing an output voltage, ¦ a regulated reference for producing a calibrated output, and operated by a single-voltage supply, e.g. +5 volts. The buffer amplifier includes means providing for driving the output voltage virtually to ground level when the DAC output is zero. The current sources comprise a single-transistor cell driven by an I2L flip-flop circuit, and the reference supply is merged with the reference transistor circuit regulating the DAC current levels, both aiding in reducing required chip area. A highly efficient bias network is utilized to supply the high-level bias currents required. - 1 -

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