CT22502
6b-1GSps SubRange Flash ADC
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.
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3-6bits, 1GSPS Sub-ranging AD Converter
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0.9V Supply
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600mV Differential Input
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0.7bits INL
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0.5bits DNL
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5.8bits ENOB typical
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36dB SNR
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50dB SFDR
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7.5mA supply current at 6 bits full speed
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2.7mA supply current at 3 bits full speed
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Digital I/Q Demodulation for RF transceivers
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Silicon Proven
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TSMC 22n technology
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Easy portability