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US 5,212,482 AGranted
Digital-to-analog converter having an externally selectable output voltage range
AssigneesFujitsu Limited, Fujitsu VLSI Limited
InventorTetsuo Okuyama
Life of this patent
Estimating the term…
Abstract
A D/A converter includes a D/A conversion part for converting a digital input signal into an analog output signal, a parameter setting part for generating a plurality of circuit parameters which define a voltage range of the analog output signal, and a setting control part for selecting desired circuit parameters from the plurality of circuit parameters in accordance with data supplied from an external device, so that the D/A conversion part generates the analog output signal having a voltage based on the desired circuit parameters.
Claims30
A D/A converter comprising:
- D/A conversion means for converting a digital input signal into an analog output signal within an output voltage range and operating under a first reference voltage and a second reference voltage;
- varying means, connected to said D/A conversion means, for varying the first reference voltage in accordance with a first control data and for varying the second reference voltage, independently of the first reference voltage, in accordance with a second control data;
- and
- storing means, connected to said varying means, for storing the first and second control data, wherein a magnitude of the output voltage range is selectively varied in accordance with the first and second control data.
1 more element
A D/A converter device comprising:
- a chip;
- and
- a plurality of D/A converters formed on said chip,
- wherein each of said D/A converters includes:
- D/A conversion means for converting a digital input signal into an analog output signal within an output voltage range and operating under a first reference voltage and a second reference voltage;
- varying means, connected to said D/A conversion means, for varying the first reference voltage in accordance with a first control data and for varying the second reference voltage, independently of the first reference voltage, in accordance with a second control data;
- and
- storing means, connected to said varying means, for storing the first and second control data, wherein a magnitude of the output voltage range is selectively varied in accordance with the first and second control data.
5 more elements
Dependencies are inferred from the claim text.