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AD781SQ Folha de dados(PDF) 5 Page - Analog Devices |
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AD781SQ Folha de dados(HTML) 5 Page - Analog Devices |
5 / 8 page AD781 REV. A –5– DEFINITIONS OF SPECIFICATIONS Acquisition Time—The length of time that the SHA must remain in the sample mode in order to acquire a full-scale input step to a given level of accuracy. Small Signal Bandwidth—The frequency at which the held output amplitude is 3 dB below the input amplitude, under an input condition of a 100 mV p-p sine wave. Full Power Bandwidth—The frequency at which the held output amplitude is 3 dB below the input amplitude, under an input condition of a 10 V p-p sine wave. Effective Aperture Delay—The difference between the switch delay and the analog delay of the SHA channel. A negative number indicates that the analog portion of the overall delay is greater than the switch portion. This effective delay represents the point in time, relative to the hold command, that the input signal will be sampled. Aperture Jitter—The variations in aperture delay for successive samples. Aperture jitter puts an upper limit on the maximum frequency that can be accurately sampled. Hold Settling Time—The time required for the output to settle to within a specified level of accuracy of its final held value after the hold command has been given. Droop Rate—The drift in output voltage while in the hold mode. Feedthrough—The attenuated version of a changing input signal that appears at the output when the SHA is in the hold mode. Hold Mode Offset—The difference between the input signal and the held output. This offset term applies only in the hold mode and includes the error caused by charge injection and all other internal offsets. It is specified for an input of 0 V. Tracking Mode Offset—The difference between the input and output signals when the SHA is in the track mode. Nonlinearity--The deviation from a straight line on a plot of input vs. (held) output as referenced to a straight line drawn between endpoints, over an input range of –5 V and +5 V. Gain Error—Deviation from a gain of +1 on the transfer function of input vs. held output. Power Supply Rejection Ratio—A measure of change in the held output voltage for a specified change in the positive or negative supply. Sampled DC Uncertainty—The internal rms SHA noise that is sampled onto the hold capacitor. Hold Mode Noise—The rms noise at the output of the SHA while in the hold mode, specified over a given bandwidth. Total Output Noise—The total rms noise that is seen at the output of the SHA while in the hold mode. It is the rms summation of the sampled dc uncertainty and the hold mode noise. Output Drive Current—The maximum current the SHA can source (or sink) while maintaining a change in hold mode offset of less than 2.5 mV. Signal-To-Noise and Distortion (S/N+D) Ratio—S/N+D is the ratio of the rms value of the measured input signal to the rms sum of all other spectral components below the Nyquist frequency, including harmonics but excluding dc. The value for S/N+D is expressed in decibels. Total Harmonic Distortion (THD)—THD is the ratio of the rms sum of the first six harmonic components to the rms value of the measured input signal and is expressed as a percentage or in decibels. Intermodulation Distortion (IMD)—With inputs consisting of sine waves at two frequencies, fa and fb, any device with nonlinearities will create distortion products, of order (m+n), at sum and difference frequency of mfa ±nfb, where m, n = 0, 1, 2, 3.... Intermodulation terms are those for which m or n is not equal to zero. For example, the second order terms are (fa+fb) and (fa–fb), and the third order terms are (2fa+fb), (2fa–fb), (fa+2fb) and (fa–2fb). The IMD products are expressed as the decibel ratio of the rms sum of the measured input signals to the rms sum of the distortion terms. The two signals are of equal amplitude, and peak value of their sums is –0.5 dB from full scale. The IMD products are normalized to a 0 dB input signal. FUNCTIONAL DESCRIPTION The AD781 is a complete sample-and hold amplifier that provides high speed sampling to 12-bit accuracy in less than 700 ns. The AD781 is completely self-contained, including an on-chip hold capacitor, and requires no external components or adjustments to perform the sampling function. Both input and output are treated as a single-ended signal, referred to common. The AD781 utilizes a proprietary circuit design which includes a self-correcting architecture. This sample-and-hold circuit corrects for internal errors after the hold command has been given, by compensating for amplifier gain and offset errors, and charge injection errors. Due to the nature of the design, the SHA output in the sample mode is not intended to provide an accurate representation of the input. However, in hold mode, the internal circuitry is reconfigured to produce an accurately held version of the input signal. Below is a block diagram of the AD781. 1 2 3 45 6 7 8 AD781 X1 VCC IN COMMON NC OUT S/H NC VEE Functional Block Diagram |
Nº de peça semelhante - AD781SQ |
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Descrição semelhante - AD781SQ |
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