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AD822 数据表(PDF) 15 Page - Analog Devices |
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AD822 数据表(HTML) 15 Page - Analog Devices |
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15 / 88 page ![]() ADuC841/ADuC842/ADuC843 Rev. 0 | Page 15 of 88 EXTERNAL REFERENCE (V) 50 0.5 1.0 2.0 2.5 5.0 55 1.5 60 65 70 75 80 –100 –95 –90 –85 –80 –75 –70 AVDD /DVDD = 5V fS = 152kHz SNR THD Figure 19. Typical Dynamic Performance vs. VREF, VDD = 5 V EXTERNAL REFERENCE (V) 80 75 65 50 70 55 AVDD/DVDD = 3V f S = 152kHz 0.5 1.5 2.5 SNR THD 60 –70 –75 –85 –100 –80 –95 –90 1.0 2.0 3.0 Figure 20. Typical Dynamic Performance vs. VREF, VDD = 3 V FREQUENCY (kHz) 64 66 68 70 72 76 80 78 74 62 60 AVDD /DVDD = 5V Figure 21. Typical Dynamic Performance vs. Sampling Frequency TEMPERATURE ( °C) 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 –40 25 85 AVDD/DVDD = 3V SLOPE = –1.4mV/ °C Figure 22. Typical Temperature Sensor Output vs. Temperature GENERAL DESCRIPTION (continued) The parts also incorporate additional analog functionality with two 12-bit DACs, power supply monitor, and a band gap reference. On-chip digital peripherals include two 16-bit ∑-∆. DACs, a dual output 16-bit PWM, a watchdog timer, a time interval counter, three timers/counters, and three serial I/O ports (SPI, I2C, and UART). On the ADuC812 and the ADuC832, the I2C and SPI interfaces share some of the same pins. For backwards compatibility, this is also the case for the ADuC841/ADuC842/ADuC843. However, there is also the option to allow SPI operate separately on P3.3, P3.4, and P3.5, while I2C uses the standard pins. The I2C interface has also been enhanced to offer repeated start, general call, and quad addressing. On-chip factory firmware supports in-circuit serial download and debug modes (via UART) as well as single-pin emulation mode via the EA pin. A functional block diagram of the parts is shown on the first page. |
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