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AD7794BRU-REEL 데이터시트(PDF) 5 Page - Analog Devices |
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AD7794BRU-REEL 데이터시트(HTML) 5 Page - Analog Devices |
5 / 36 page AD7794/AD7795 Rev. D | Page 5 of 36 Parameter1 AD7794/AD7795 Unit Test Conditions/Comments Normal Mode Rejection2, 6 Internal Clock @ 50 Hz, 60 Hz 60 dB min 70 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 1010 @ 50 Hz 78 dB min 90 dB typ, 50 ± 1 Hz, FS[3:0] = 1001 @ 60 Hz 86 dB min 100 dB typ, 60 ± 1 Hz, FS[3:0] = 1000 External Clock @ 50 Hz, 60 Hz 60 dB min 70 dB typ, 50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 1010 @ 50 Hz 94 dB min 100 dB typ, 50 ± 1 Hz, FS[3:0] = 1001 @ 60 Hz 90 dB min 100 dB typ, 60 ± 1 Hz, FS[3:0] = 1000 Common-Mode Rejection AD7794B/AD7795B @ DC 100 dB min AIN = 1 V/gain, with gain = 4, AMP-CM Bit = 1 @ 50 Hz, 60 Hz2 100 dB min 50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 1010 @ 50 Hz, 60 Hz2 100 dB min 50 ± 1 Hz, FS[3:0] = 1001; 60 ± 1 Hz, FS[3:0] = 1000 AD7794C @ DC 97 dB min AIN = 1 V/gain, with gain = 4, AMP-CM Bit = 1 @ 50 Hz, 60 Hz2 97 dB min 50 ± 1 Hz, 60 ± 1 Hz, FS[3:0] = 1010 @ 50 Hz, 60 Hz2 97 dB min 50 ± 1 Hz, FS[3:0] = 1001; 60 ± 1 Hz, FS[3:0] = 1000 CHOP ENABLED or DISABLED REFERENCE INPUT Internal Reference Internal Reference Initial Accuracy 1.17 ± 0.01% V min/max AVDD = 4 V, TA = 25°C Internal Reference Drift2 4 ppm/°C typ 15 ppm/°C max Power Supply Rejection 85 dB typ External Reference External REFIN Voltage 2.5 V nom REFIN = REFIN(+) − REFIN(−) Reference Voltage Range2 0.1 V min AVDD V max When VREF = AVDD, the differential input must be limited to 0.9 × VREF/gain if the in-amp is active Absolute REFIN Voltage Limits2 GND − 30 mV V min AVDD + 30 mV V max Average Reference Input Current 400 nA/V typ Average Reference Input Current Drift ±0.03 nA/V/°C typ Normal Mode Rejection2 Same as for analog inputs Common-Mode Rejection 100 dB typ Reference Detect Levels 0.3 V min 0.65 V max NOXREF bit active if VREF < 0.3 V EXCITATION CURRENT SOURCES (IEXC1 and IEXC2) Output Current 10/210/1000 μA nom Initial Tolerance at 25°C ±5 % typ Drift 200 ppm/°C typ Current Matching ±0.5 % typ Matching between IEXC1 and IEXC2, VOUT = 0 V Drift Matching 50 ppm/°C typ Line Regulation (AVDD) 2 %/V typ AVDD = 5 V ± 5% Load Regulation 0.2 %/V typ Output Compliance AVDD − 0.65 V max Current sources programmed to 10 μA or 210 μA AVDD − 1.1 V max Current sources programmed to 1 mA GND − 30 mV V min |
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