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AD7731 Datasheet(PDF) 2 Page - Analog Devices |
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AD7731 Datasheet(HTML) 2 Page - Analog Devices |
2 / 44 page –2– REV. 0 AD7731–SPECIFICATIONS Parameter B Version 1 Units Conditions/Comments STATIC PERFORMANCE (CHP = 0) No Missing Codes 2 24 Bits min SKIP = 0 3 Output Noise and Update Rates 2 See Tables I and II Integral Nonlinearity 15 ppm of FSR max Offset Error 2 See Note 4 Offset Error and Offset Drift Refer to Both Offset Drift vs. Temperature 2 0.5 µV/°C typ Input Range = 20 mV, 40 mV, 80 mV, 160 mV 1/2/5 µV/°C typ Input Range = 320 mV/640 mV/1.28 V Offset Drift vs. Time 5 2.5 µV/1000 Hr Positive Full-Scale Error 2, 6 See Note 4 Positive Full-Scale Drift vs. Temp 2, 7, 8 0.6 µV/°C typ Input Range = 20 mV, 40 mV, 80 mV, 160 mV 1.5/3/6 µV/°C typ Input Range = 320 mV/640 mV/1.28 V Positive Full-Scale Drift vs. Time 5 3 µV/1000 Hr Gain Error 2, 9 See Note 4 Gain Drift vs. Temperature 2, 7, 10 2 ppm/ °C typ Gain Drift vs. Time 5 10 ppm/1000 Hr Bipolar Negative Full-Scale Error 2 See Note 4 Negative Full-Scale Drift vs. Temp 2, 7 1 µV/°C typ Power Supply Rejection 11 90 dB typ Input Range = 20 mV Power Supply Rejection 11 60 dB typ Input Range = 1.28 V Common-Mode Rejection (CMR) 11 On AIN 95 dB typ At DC. Input Range = 20 mV On AIN 85 dB typ At DC. Input Range = 1.28 V On REF IN 120 dB typ Analog Input DC Bias Current 2 60 nA max Analog Input DC Bias Current Drift 2 150 pA/ °C typ Analog Input DC Offset Current 2 30 nA max Analog Input DC Offset Current Drift 2 100 pA/ °C typ STATIC PERFORMANCE (CHP = 1) 2 No Missing Codes 24 Bits min Output Noise and Update Rates See Tables III and IV Integral Nonlinearity 15 ppm of FSR max Offset Error See Note 4 Offset Error and Offset Drift Refer to Both Offset Drift vs. Temperature 5 nV/ °C typ Unipolar Offset and Bipolar Zero Errors Offset Drift vs. Time 5 25 nV/1000 Hr typ Positive Full-Scale Error 6 See Note 4 Positive Full-Scale Drift vs. Temp 7, 8 2 ppm of FS/ °C max Positive Full-Scale Drift vs. Time 5 10 ppm of FS/1000 Hr Gain Error 9 See Note 4 Gain Drift vs. Temperature 7, 10 2 ppm/ °C max Gain Drift vs. Time 5 10 ppm/1000 Hr Bipolar Negative Full-Scale Error See Note 4 Negative Full-Scale Drift vs. Temp 2 ppm of FS/ °C max Power Supply Rejection 11 110 dB typ Input Range = 20 mV Power Supply Rejection 11 85 dB typ Input Range = 1.28 V Common-Mode Rejection (CMR) 11 On AIN 110 dB typ At DC. Input Range = 20 mV On AIN 85 dB typ At DC. Input Range = 1.28 V On REF IN 120 dB typ Analog Input DC Bias Current 50 nA max Analog Input DC Bias Current Drift 100 pA/ °C typ Analog Input DC Offset Current 10 nA max Analog Input DC Offset Current Drift 50 pA/ °C typ ANALOG INPUTS/REFERENCE INPUTS Normal Mode 50 Hz/60 Hz Rejection 2 88 dB min 50 Hz/60 Hz ±1 Hz. SKIP = 0 Common-Mode 50 Hz/60 Hz Rejection 2 120 dB min 50 Hz/60 Hz ±1 Hz. SKIP = 0 Analog Inputs Differential Input Voltage Ranges 12 Assuming 2.5 V or 5 V Reference with HIREF Bit Set Appropriately 0 to +20 or ±20 mV nom RN2, RN1, RN0 of Mode Register = 0, 0, 1 0 to +40 or ±40 mV nom RN2, RN1, RN0 of Mode Register = 0, 1, 0 0 to +80 or ±80 mV nom RN2, RN1, RN0 of Mode Register = 0, 1, 1 0 to +160 or ±160 mV nom RN2, RN1, RN0 of Mode Register = 1, 0, 0 0 to +320 or ±320 mV nom RN2, RN1, RN0 of Mode Register = 1, 0, 1 0 to +640 or ±640 mV nom RN2, RN1, RN0 of Mode Register = 1, 1, 0 0 to +1.28 or ±1.28 V nom RN2, RN1, RN0 of Mode Register = 1, 1, 1 (AVDD = +5 V, DVDD = +3 V or +5 V; REF IN(+) = +2.5 V; REF IN(–) = AGND; AGND = DGND = 0 V; fCLK IN = 4.9152 MHz. All specifications TMIN to TMAX unless otherwise noted.) |
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