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AD7821 데이터시트(PDF) 4 Page - Analog Devices |
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AD7821 데이터시트(HTML) 4 Page - Analog Devices |
4 / 12 page AD7821 REV. A –4– ABSOLUTE MAXIMUM RATINGS* VDD to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V, + 7 V VSS to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.3 V, + 7 V Digital Input Voltage to GND (Pins 6–8, 13) . . . . . . . . . . . . . . . . . . . –0.3 V, VDD + 0.3 V Digital Output Voltage to GND (Pins 2–5, 9, 14–18) . . . . . . . . . . . . . . . –0.3 V, VDD + 0.3 V VREF(+) to GND . . . . . . . . . . . . . . . VSS – 0.3 V, VDD + 0.3 V VREF(–) to GND . . . . . . . . . . . . . . . VSS – 0.3 V, VDD + 0.3 V VIN to GND . . . . . . . . . . . . . . . . . . . VSS – 0.3 V, VDD + 0.3 V Operating Temperature Range Commercial (K Version) . . . . . . . . . . . . . . –40 °C to +85°C Industrial (B Version) . . . . . . . . . . . . . . . . –40 °C to +85°C Extended (T Version) . . . . . . . . . . . . . . . –55 °C to +125°C Storage Temperature Range . . . . . . . . . . . . –65 °C to +150°C Lead Temperature (Soldering, 10 secs) . . . . . . . . . . . +300 °C Power Dissipation (Any Package) to +75 °C . . . . . . . . 450 mW Derates above +75 °C by . . . . . . . . . . . . . . . . . . . . . 6 mW/°C *Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. TERMINOLOGY LEAST SIGNIFICANT BIT (LSB) An ADC with 8-bit resolution can resolve one part in 2 8 (1/256 of full scale). For the AD7821 operating in either the unipolar or bipolar input range with 5 V full scale, one LSB is 19.53 mV. TOTAL UNADJUSTED ERROR This is a comprehensive specification which includes relative accuracy, offset error and full-scale error. SLEW RATE Slew Rate is the maximum allowable rate of change of input signal such that the digital sample values are not in error. TOTAL HARMONIC DISTORTION Total harmonic distortion is the ratio of the square root of the sum of the squares of the rms value of the harmonics to the rms value of the fundamental. For the AD7821, total harmonic dis- tortion (THD) is defined as 20 log V 2 2 +V 3 2 +V 5 2 +V 6 2 () V1 dB where V1 is the rms amplitude of the fundamental and V2, V3, V4, V5, V6, are the rms amplitudes of the individual harmonics. INTERMODULATION DISTORTION With inputs consisting of sine waves at two frequencies, fa and fb, any active device with nonlinearities will create distortion products, of order (m+n), at sum and difference frequencies 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 include (fa + fb) and (fa – fb), and the third order terms include (2fa + fb), (2fa – fb), (fa + 2fb) and (fa – 2fb). For the AD7821 intermodulation distortion is calcu- lated separately for both the second and third order terms. SIGNAL-TO-NOISE RATIO Signal-to-noise ratio (SNR) is measured signal-to-noise at the output of the ADC. The signal is the rms magnitude of the fun- damental. Noise is the rms sum of all nonfundamental signals (excluding dc) up to half the sampling frequency. SNR is de- pendent on the number of quantization levels used in the digiti- zation process. The theoretical SNR for a sine wave input is given by: SNR = (6.02 N + 1.76) dB where N is the number of bits in the ADC. Thus, for an ideal 8-bit ADC, SNR = 50 dB. PEAK HARMONIC OR SPURIOUS NOISE Peak harmonic or spurious noise is the rms value of the largest nonfundamental frequency (excluding dc) up to half the sam- pling frequency to the rms value of the fundamental. PIN CONFIGURATIONS DIP AND SOIC LCCC PLCC WARNING! ESD SENSITIVE DEVICE CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD7821 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. |
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