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RHD5958 Datasheet(PDF) 2 Page - Aeroflex Circuit Technology |
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RHD5958 Datasheet(HTML) 2 Page - Aeroflex Circuit Technology |
2 / 8 page 2 SCD5958 Rev A 3/6/14 Aeroflex Plainview Gain compression will occur near either power supply extremes but can be avoided if the references are more than 200mV away from the respective supply terminals. The input span can be less than 4 volts at the expense of ultimate resolution The analog channels input impedance is primary capacitance (20pF typical). The input voltage charges a track-and-hold hold capacitor through transmission gates. The input bandwidth is determined by the slew rate of the hold amplifier and is adequate to allow input sampling in three clock periods (3uS nominal). The ultimate bandwidth is determined by the aperture uncertainty associated with the closing of the sample gate (approximately 5nS). The converter bandwidth is then determined by the sampling Nyquist frequency rather than the input signal; change rate (dv/dt) and the LSB weight in volts as would be the case if there were no sample and hold. Start-Convert (STCNV_H), Busy (BUSY_L) and End-Of-Convert (EOC_H) status and control line are provided. The converter will operate in either continuous or single conversion modes. To operate in continuous mode, STCNV_H should be tied to BUSY_L. The digital output register changes at the end of a conversion and is available when EOC_H is asserted High. The output circuitry operates from a voltage independent of the remainder of the chip such that I/O is compatible with digital systems from, less than 3.3 volts, to 5 volts. The converter divides the reference voltage into 16 segments with a linear weighted resistor network. The voltage on any segment is passed to a linear 10-bit DAC for interpolation. The architecture is inherently capable of monotonic operation. Typically INL is 0.12% FSR and DNL is < 0.03% FSR. The sampled input voltage is compared to the output of the two stage DAC for a 14-bit successive approximation conversion. All inputs are protected to both power supply rails by semiconductor diodes. Inputs should be constrained to VCC +0.4 and GND-0.4 to avoid forward biasing protection paths. The devices will not latch with SEU events to above 100 MeV-cm2/mg. Total dose degradation is minimal to above 1 Mrad(Si). Displacement damage environments to neutron fluence equivalents in the mid 1014 neutrons per cm2 range are readily tolerated. There is no sensitivity to low-dose rate (ELDRS) effects. SEU effects are application dependent. Notes: - The STCNV_H is a dynamic input (positive edge triggered) and should not be tied to a static voltage. - The input signals should be low pass filtered to reduce high frequency noise - If Sleep mode is enabled (EN_H=0), when waking up (EN_H=1), the unit has to complete an entire conversion cycle so the digital logic is in the proper state. Ex. If using a 1MHz clock; after EN_H=1 and 20us after STCNV_H is applied. |
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