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6bits, 1Gsps Sub-Ranging Flash AD Converter
CT22502 is a configurable 3-6bits subranging ADC working at 1GSps speed.
The coarse converter that produces, at every clock cycle the Digital data used to evaluate the 3 MSB of the result and an analog residue signal to be used by the fine converters.
The C-DAC combines the input and the ADC coarse digital output to generate the residual voltage which is converted by the ADC fine to get 3 additional bits of resolution.
Both C-DAC and fine ADC work at half of the frequency and are used interleaved so that a converted value is generated at each clock cycle.
ADC Calibration can be performed in two modes:
• Auto calibration: the detected calibration code is automatically used to calibrate the ADC. This is the fastest way to calibrate the ADC but the result is affected by the noise.
• Store/retrieve mode: the calibration is performed several times and collected Data are averaged. This mode of calibration is slow but offers some noise immunity.
The coarse converter that produces, at every clock cycle the Digital data used to evaluate the 3 MSB of the result and an analog residue signal to be used by the fine converters.
The C-DAC combines the input and the ADC coarse digital output to generate the residual voltage which is converted by the ADC fine to get 3 additional bits of resolution.
Both C-DAC and fine ADC work at half of the frequency and are used interleaved so that a converted value is generated at each clock cycle.
ADC Calibration can be performed in two modes:
• Auto calibration: the detected calibration code is automatically used to calibrate the ADC. This is the fastest way to calibrate the ADC but the result is affected by the noise.
• Store/retrieve mode: the calibration is performed several times and collected Data are averaged. This mode of calibration is slow but offers some noise immunity.
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Block Diagram of the 6bits, 1Gsps Sub-Ranging Flash AD Converter
