D/A converter with improved means to prevent output signal insta

Details D/A converter with improved means to prevent output signal insta D/A converter with improved means to prevent output signal insta

1995-10-30

1998-01-06

Gaffin, Jeffrey A.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

361 92, H03M 166

Patent

active

057060053

ABSTRACT:
An integrated-circuit (IC) chip formed with a D-to-A converter (DAC) and an amplifier to receive the DAC output and to produce a corresponding signal for an output terminal. The chip includes control circuitry to prevent harmful instability in the signal at the output terminal during times that one or more power supply voltages are changing. The control circuitry includes a voltage-monitoring device which produces a RESET signal when a monitored supply voltage is beyond its nominal operating range. The RESET signal de-activates the amplifier input and output circuits, and following a short time delay after the start of RESET, disables the amplifier by killing the amplifier bias currents. The chip is arranged to receive a RESET signal from external devices, and to produce a RESET signal for any other devices in the system.

REFERENCES:
patent: 4520418 (1985-05-01), Susi
patent: 5224010 (1993-06-01), Tran et al.
patent: 5258758 (1993-11-01), Sooch

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