A microwave oven fire 10 things you may not know about Tesla Analog Fundamentals: Instrumentation for impedance measurement Why is everything junk? (Heat-pump edition) Creating JARVIS - Smart microphones enabling the Stop double-checking your resistor values! Write a Comment To comment please Log In MOST RECENT Manipulate analog filter gain to align op amps Complete the simulation of your ADC with IBIS Simulating the front-end of your For DACs, resolution is similar but reversed--incrementing the code applied to a higher resolution DAC produces smaller step sizes in the analog output.

Forgot Your Password? Forgot Your Password? Sampling Rate/Frequency Sampling rate or sampling frequency, specified in samples per second (sps), is the rate at which an ADC acquires (samples) the analog input. So you try to pick an amplifier with a closed-loop bandwidth just a little higher than the maximum frequency of your signal.

Your cache administrator is webmaster. The closed-loop noise gain is the amplifier's gain, as if a small voltage source were in series with the op amp's noninverting input. In the lab, you may find that, when you put an input-sine-wave signal at the application's maximum frequency into your system, the output signal from your amplifier does not go across contact us. © 2015 Maxim Integrated | Contact Us | Careers | Legal | Privacy | Cookie Policy | Site Map | Follow Us: © 2015 Maxim Integrated | Contact Us

In differential systems, where the signal is not referenced to ground but where the positive input is referenced to the negative input, a bipolar signal is one in which the positive Intermodulation Distortion (IMD) IMD is a phenomenon in which nonlinearity in a circuit or device creates new frequency components not in the original signal. Read this Next Managing Noise in the Signal Chain, Part 1: Annoying Semiconductor Noise, Preventable or Inescapable? Many factors affect the accuracy of a data-converter system, with gain error among the most important.

This part family contains a multiplier and an adder so both gain and offset errors can be calibrated out. For instance, start with a signal bandwidth of 1 MHz. Download Download, PDF Format(189.9kB) © Oct 27, 2009, Maxim Integrated Products, Inc. An example of ratiometric measurement using a resistive bridge is shown in the figure below.

However, this approach introduces a problem that is easily seen by looking at calibrated codes and the differential nonlinearity. For a sinewave, the RMS value is 2/2 (or 0.707) times the peak value, which is 0.354 times the peak-to-peak value. Table 1. R is the potentiometer ratio, .

Now VOUT = 2.75V. For an ADC, it is essential that the time required for voltage on the sampling capacitor to settle to within 1 LSB be less than the converter's acquisition time. Typically measured as nV•s, it equals the area under the curve on a voltage-vs-time graph. The error can be calibrated out digitally.

Transition Noise Transition noise is the range of input voltages that cause an ADC output to toggle between adjacent output codes. For sigma-delta ADCs, the sampling rate is typically much higher than the output data rate. The correct, best answer is understandable in general terms: a high-resolution data converter will be more accurate than a low-resolution data converter. Novice answers usually suggest the 10-/12-bit region.

For this circuit, if you are willing to tolerate a gain error of 0.05 from your amplifier and you understand that the GBWP of an amplifier can change a maximum of Will the right voltage reference stand up? Digitally calibrating gain error in this way is quite valid and, in fact, Maxim uses this technique in several devices including the MAX5774. Figure 1.

Other trimmable references are shown in Table 1 below. Common-mode rejection ratio (CMRR) is the ratio of the differential signal gain to the common-mode signal gain. Show All > Questions or feedback? No Missing Codes An ADC has no missing codes if it produces all possible digital codes in response to a ramp signal applied to the analog input.

Harmonic A harmonic of a periodic signal is a sinewave multiple of the signal's fundamental frequency. Thus it's important to choose a high open-loop gain amp for applications requiring high closed-loop gains. The only way around this is to increase the DAC's resolution. Full-scale error for an ADC and a DAC.

The effect of this is shown in Figure 5. Gain and Offset Errors An ideal 14-bit DAC has the characteristic shown in Figure 1. Startup Digs Deep Learning, Snags Big Backers