Datasheet AD7730, AD7730L (Analog Devices) - 2

AD7730–SPECIFICATIONS (AVDD = +5 V, DVDD = +3 V or +5 V; REF IN(+) = AVDD; REF IN(–) = AGND = DGND = 0 V; fCLK IN = 4.9152 MHz. All specifications TMIN to TMAX unless otherwise noted.) Parameter B Version1 Units Conditions/Comments
STATIC PERFORMANCE (CHP = 1) No Missing Codes2 24 Bits min Output Noise and Update Rates2 See Tables I & II Integral Nonlinearity 18 ppm of FSR max Offset Error2 See Note 3 Offset Error and Offset Drift Refer to Both Offset Drift vs. Temperature2 5 nV/°C typ Unipolar Offset and Bipolar Zero Errors Offset Drift vs. Time4 25 nV/1000 Hours typ Positive Full-Scale Error2, 5 See Note 3 Positive Full-Scale Drift vs Temp2, 6, 7 2 ppm of FS/°C max Positive Full-Scale Drift vs Time4 10 ppm of FS/1000 Hours typ Gain Error2, 8 See Note 3 Gain Drift vs. Temperature2, 6, 9 2 ppm/°C max Gain Drift vs. Time4 10 ppm/1000 Hours typ Bipolar Negative Full-Scale Error2 See Note 3 Negative Full-Scale Drift vs. Temp2, 6 2 ppm of FS/°C max Power Supply Rejection 120 dB typ Measured with Zero Differential Voltage Common-Mode Rejection (CMR) 120 dB min At DC. Measured with Zero Differential Voltage Analog Input DC Bias Current2 50 nA max Analog Input DC Bias Current Drift2 100 pA/°C typ Analog Input DC Offset Current2 10 nA max Analog Input DC Offset Current Drift2 50 pA/°C typ STATIC PERFORMANCE (CHP = 0)2 No Missing Codes 24 Bits min SKIP = 010 Output Noise and Update Rates See Tables III & IV Integral Nonlinearity 18 ppm of FSR max Offset Error See Note 3 Offset Error and Offset Drift Refer to Both Offset Drift vs. Temperature6 0.5 μV/°C typ Unipolar Offset and Bipolar Zero Errors Offset Drift vs. Time4 2.5 μV/1000 Hours typ Positive Full-Scale Error5 See Note 3 Positive Full-Scale Drift vs. Temp6, 7 0.6 μV/°C typ Positive Full-Scale Drift vs. Time4 3 μV/1000 Hours typ Gain Error8 See Note 3 Gain Drift vs. Temperature6, 9 2 ppm/°C typ Gain Drift vs. Time4 10 ppm/1000 Hours typ Bipolar Negative Full-Scale Error See Note 3 Negative Full-Scale Drift vs. Temp 0.6 μV/°C typ Power Supply Rejection 90 dB typ Measured with Zero Differential Voltage Common-Mode Rejection (CMR) on AIN 100 dB typ At DC. Measured with Zero Differential Voltage CMR on REF IN 120 dB typ At DC. Measured with Zero Differential Voltage Analog Input DC Bias Current 60 nA max Analog Input DC Bias Current Drift 150 pA/°C typ Analog Input DC Offset Current 30 nA max Analog Input DC Offset Current Drift 100 pA/°C typ ANALOG INPUTS/REFERENCE INPUTS Normal-Mode 50 Hz Rejection2 88 dB min From 49 Hz to 51 Hz Normal-Mode 60 Hz Rejection2 88 dB min From 59 Hz to 61 Hz Common-Mode 50 Hz Rejection2 120 dB min From 49 Hz to 51 Hz Common-Mode 60 Hz Rejection2 120 dB min From 59 Hz to 61 Hz Analog Inputs Differential Input Voltage Ranges11 Assuming 2.5 V or 5 V Reference with HIREF Bit Set Appropriately 0 to +10 or ± 10 mV nom Gain = 250 0 to +20 or ± 20 mV nom Gain = 125 0 to +40 or ± 40 mV nom Gain = 62.5 0 to +80 or ± 80 mV nom Gain = 31.25 Absolute/Common-Mode Voltage12 AGND + 1.2 V V min AVDD – 0.95 V V max Reference Input REF IN(+) – REF IN(–) Voltage +2.5 V nom HIREF Bit of Mode Register = 0 REF IN(+) – REF IN(–) Voltage +5 V nom HIREF Bit of Mode Register = 1 Absolute/Common-Mode Voltage13 AGND – 30 mV V min AVDD + 30 mV V max NO REF Trigger Voltage 0.3 V min NO REF Bit Active If VREF Below This Voltage 0.65 V max NO REF Bit Inactive If VREF Above This Voltage –2– REV. B