DAC shutdown for low power supply condition

Details DAC shutdown for low power supply condition DAC shutdown for low power supply condition

1991-01-31

1993-11-02

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

361 92, 307130, 371 66, H03M 166

Patent

active

052587584

ABSTRACT:
A digital-to-analog converter for operating in a low power condition includes a delta-sigma modulator (10) for converting an n-bit digital input signal to an m-bit digital output signal. The output signal is filtered with a switched-capacitor filter (12) and an active RC low-pass filter (18). A low power supply detect circuit receives two power supply input voltages, the low and the high power supplies, and outputs a control signal on a line (38) indicating a low power supply condition. The digital-to-analog converter includes an output stage (26) with the analog output thereof being connected to an analog output terminal (30). A switch (28) is provided for connecting the output stage to the analog output terminal (30) in normal operating mode. In a low power mode, the low power detect circuit (20) generates a control signal on line (38) in response to the power supply voltage falling below a predetermined threshold. The switch (28) is opened and a shunt switch (32) provides a squelch operation by being configured in a closed configuration during a low power condition. Alternately, the output stage (26) can be powered down in the low power condition.

REFERENCES:
patent: 4270168 (1981-05-01), Murphy et al.
patent: 4276593 (1981-06-01), Hansen
patent: 4428020 (1984-01-01), Blanchard, Jr.
patent: 4530027 (1985-07-01), Berger
patent: 4665459 (1987-05-01), Bynum et al.

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