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ADUC831 Datasheet(PDF) 11 Page - Analog Devices |
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ADUC831 Datasheet(HTML) 11 Page - Analog Devices |
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11 / 76 page  REV. 0 Typical Performance Characteristics–ADuC831 –11– The typical performance plots presented in this section illustrate typical performance of the ADuC831 under various operating conditions. TPC 1 and TPC 2 below show typical ADC Integral Nonlinearity (INL) errors from ADC code 0 to code 4095 at 5 V and 3 V supplies respectively. The ADC is using its internal reference (2.5 V) and operating at a sampling rate of 152 kHz and the typically worst-case errors in both plots is just less than 0.3 LSBs. TPC 3 and TPC 4 below show the variation in Worst Case Positive (WCP) INL and Worst Case Negative (WCN) INL versus external reference input voltage. TPC 5 and TPC 6 show typical ADC differential nonlinearity (DNL) errors from ADC code 0 to code 4095 at 5 V and 3 V sup- plies, respectively. The ADC is using its internal reference (2. V) and operating at a sampling rate of 152 kHz and the typically worst case errors in both plots is just less than 0.2 LSBs. TPC 7 and TPC 8 show the variation in worst case positive (WCP) DNL and worst-case negative (WCN) DNL versus external reference input voltage. TPC 9 shows a histogram plot of 10,000 ADC conversion results on a dc input with VDD = 5 V. The plot illustrates an excellent code distribution pointing to the low noise perfor- mance of the on-chip precision ADC. TPC 10 shows a histogram plot of 10,000 ADC conversion results on a dc input for VDD = 3 V. The plot again illustrates a very tight code distribution of 1 LSB with the majority of codes appearing in one output bin. TPC 11 and TPC 12 show typical FFT plots for the ADuC831. These plots were generated using an external clock input. The ADC is using its internal reference (2.5 V) sampling a full-scale, 10 kHz sine wave test tone input at a sampling rate of 149.79 kHz. The resultant FFTs shown at 5 V and 3 V supplies illustrate an excellent 100 dB noise floor, 71 dB Signal-to-Noise Ratio (SNR) and THD greater than –80 dB. TPC 13 and TPC 14 show typical dynamic performance versus external reference voltages. Again excellent ac performance can be observed in both plots with some roll-off being observed as VREF falls below 1 V. TPC 15 shows typical dynamic performance versus sampling frequency. SNR levels of 71 dBs are obtained across the sam- pling range of the ADuC831. TPC 16 shows the voltage output of the on-chip temperature sensor versus temperature. Although the initial voltage output at 25ºC can vary from part to part, the resulting slope of –2 mV/ºC is constant across all parts. ADC CODES –1.0 0 511 1023 2047 2559 3071 –0.8 1535 3583 –0.6 –0.4 –0.2 0 0.2 0.4 0.6 0.8 1.0 AVDD / DVDD = 5V fS = 152kHz 4095 TPC 1. Typical INL Error, VDD = 5 V ADC CODES 1.0 511 1023 1535 2047 2559 0.6 0.2 –0.2 –0.6 –1.0 0.8 0.4 0 –0.4 –0.8 3071 3583 0 4095 AVDD/DVDD = 3V f S = 152kHz TPC 2. Typical INL Error, VDD = 3 V EXTERNAL REFERENCE – V 1.2 0.8 0.4 0 –0.4 –0.6 1.0 0.6 0.2 –0.2 AVDD/DVDD = 5V f S = 152kHz 0.5 1.0 1.5 2.0 2.5 5.0 0.6 0.4 0 –0.4 –0.6 0.2 –0.2 WCN INL WCP INL TPC 3. Typical Worst Case INL Error vs. VREF, VDD = 5 V EXTERNAL REFERENCE – V 0.8 0.4 0 –0.4 –0.8 0.6 0.2 –0.2 AVDD/DVDD = 3V f S = 152kHz 0.5 1.5 2.5 –0.6 0.8 0.4 0 –0.4 –0.8 0.6 0.2 –0.2 –0.6 3.0 2.0 1.0 WCN INL WCP INL TPC 4. Typical Worst Case INL Error vs. VREF, VDD = 3 V |
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