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AD7798 Datasheet(PDF) 5 Page - Analog Devices |
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AD7798 Datasheet(HTML) 5 Page - Analog Devices |
5 / 28 page Data Sheet AD7798/AD7799 Rev. B | Page 5 of 28 Parameter AD7798B/AD7799B1 Unit Test Conditions/Comments SYSTEM CALIBRATION2 Full-Scale Calibration Limit 1.05 × FS V max FS = Full-scale analog input. When VREF = AVDD, the differential input must be limited to (0.9 × VREF/gain) if the in-amp is active. Zero-Scale Calibration Limit −1.05 × FS V min Input Span 0.8 × FS V min 2.1 × FS V max POWER REQUIREMENTS7 Power Supply Voltage AVDD – GND 2.7/5.25 V min/max DVDD – GND 2.7/5.25 V min/max Power Supply Currents IDD Current 140 µA max Unbuffered mode, 110 µA typ @ AVDD = 3 V, 125 µA typ @ AVDD = 5 V 180 µA max Buffered mode, gain = 1 or 2, 130 µA typ @ AVDD = 3 V, 165 µA typ @ AVDD = 5 V 400 µA max AD7798: gain = 4 to 128, 300 µA typ @ AVDD = 3 V, 350 µA typ @ AVDD = 5 V 500 µA max AD7799: gain = 4 to 128, 380 µA typ @ AVDD = 3 V, 440 µA typ @ AVDD = 5 V IDD (Power-Down Mode) 1 µA max 1 Temperature range is –40°C to +105°C. At the 19.6 Hz and 39.2 Hz update rates, the INL, power supply rejection (PSR), common-mode rejection (CMR), and normal mode rejection (NMR) do not meet the data sheet specification if the voltage on the AIN(+) or AIN(−) pins exceeds AVDD − 1.6 V typically. When this voltage is exceeded, the INL, for example, is reduced to 18 ppm of FS typically and the PSR is reduced to 69 dB typically. Therefore, for guaranteed performance at these update rates, the absolute voltage on the analog input pins needs to be below AVDD − 1.6 V. 2 Specification is not production tested, but is supported by characterization data at initial product release. 3 Following a calibration, this error is in the order of the noise for the programmed gain and update rate selected. 4 Recalibration at any temperature removes these errors. 5 Full-scale error applies to both positive and negative full-scale and applies at the factory calibration conditions (AVDD = 4 V, gain = 1, TA = 25°C). 6 FS[3:0] are the four bits used in the mode register to select the output word rate. 7 Digital inputs equal to DVDD or GND. |
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