Examples of using Reference input in English and their translations into Japanese
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External reference input voltage[Vref].
The unit canbe integrated into an existing system as a sub-switcher via a reference input.
Three kinds of reference inputs: analog voltage, PWM, frequency.
The decoupling capacitor is ideally laid out in proximity to the reference input of the ADC.
The applied external reference input voltage VREF determines the full-scale output current.
The alarm setpoint adjustablerange is -50 to +50% of the span(4V) of the reference input 1- 5Vdc.
The applied external reference input voltage VREF determines the full-scale output current.
Figure 3 compares the phasenoise profile of the Crystek CVHD-950 VCXO and the reference input phase noise.
Sense pins for the reference input allow full-scale calibration of the input range or facilitate ratiometric use.
The MAX1241 accepts signals from 0V to VREF, and the reference input range includes the positive supply rail.
The second implementation uses two photodiodes,one connected to the logging input and the other to the reference input.
First, it's important to match the impedance at the reference input port of the PLL to minimize reflections.
In the first, a single photodiode is connected to the logging input, while a reference current is connected to the reference input.
The bandwidth of this loop directly affects the amount of reference input phase noise that will propagate to the output.
Cost is lower because the ratiometric bridge does not require a precision reference source for driving the bridge andADC reference input.
Using the cookbook values, the rise time at the reference input is several time constants(where T R3Cf 5 s), or about 10 to 15 seconds.
The DAC's reference input is driven by an ultra-high precision 5V voltage reference, the MAX6126(U402), with 0.02% initial accuracy and a 3ppm/°C maximum temperature coefficient tempco.
These devices alsofeature on-chip buffers for the differential signal and reference input, allowing direct interface with high-impedance signal sources.
Using AN11 as the reference input and connecting it to the 5V supply sets the full-scaleinput of the ADC to 5V and allows it to be used with the ratiometric sensors.
A high value reservoircapacitor is placed as close as possible to the reference input to supply that current and keep the reference input noise low.
The ADC's reference input is driven by an ultra-high-precision 4.096V voltage reference, the MAX6126(U3), with 0.02% initial accuracy and a 3ppm/°C maximum temperature coefficient tempco.
For example,MUXOUT can show the output of the R-counter to indicate that the reference input signal is fine and that the contents of the register were successfully written.
A common-mode reference input pin is provided to align the amplifier output common-mode with the ADC input requirements. Use this device with power supplies between 3.3 V and 5.0 V; dual-supply operation is supported when required by the application.
Conclusion Simple circuits thatmaintain the proper relationship between the output of a sensor and the reference input of an ADC can eliminate the need for a voltage reference or a current source in many sensor applications.
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For example, placing the SPI bus too close to the reference input or VCO output will cause spurs on the PLL output when accessing the PLL registers.
The supply voltagescan be adjusted by trimming the regulator's reference input(for voltage-regulator modules), altering the voltage regulator's feedback loop, adjusting a"brick" power supply's trim input, or by programming the regulator through an interface.
Block diagram of the AD9523-1. Many engineers think ofdual-loop PLLs as frequency translators that reduce the reference input jitter by a fixed amount, but it is more accurate to think of them as low phase noise frequency translators whose performance is affected by each PLL's loop bandwidth and the phase noise profiles of the VCO/VCXOs.
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