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AD7747ARUZ Datasheet(PDF) 3 Page - Analog Devices |
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AD7747ARUZ Datasheet(HTML) 3 Page - Analog Devices |
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3 / 28 page  AD7747 Rev. 0 | Page 3 of 28 SPECIFICATIONS VDD = 2.7 V to 3.6 V or 4.75 V to 5.25 V; GND = 0 V; EXC = ±VDD × 3/8; −40°C to +125°C, unless otherwise noted. Table 1. Parameter Min Typ Max Unit Test Conditions/Comments CAPACITIVE INPUT Conversion Input Range ±8.192 pF1 Factory calibrated Integral Nonlinearity (INL)2 ±0.01 % of FSR1 No Missing Codes2 24 Bit Conversion time ≥ 124 ms Resolution, p-p 16.5 Bit Conversion time 124 ms, see Table 5 Resolution Effective 19.1 Bit Conversion time 124 ms, see Table 5 Output Noise, rms 11.0 aF/ √Hz Conversion time 124 ms, see Table 5 Absolute Error3 ±10 fF1 25°C, VDD = 5 V, after offset calibration Offset Error4, 5 32 aF1 After system offset calibration, excluding effect of noise4 System Offset Calibration Range5 ±1 pF Offset Deviation over Temperature2 0.4 fF See Figure 6 Gain Error6 0.02 0.11 % of FS1 25°C, VDD = 5 V Gain Drift vs. Temperature2 −23 −26 −29 ppm of FS/°C Power Supply Rejection2 0.5 4 fF/V Normal Mode Rejection5 72 dB 50 Hz ± 1%, conversion time 124 ms 60 dB 60 Hz ± 1%, conversion time 124 ms CAPDAC Full Range 17 21 pF 6-bit CAPDAC Differential Nonlinearity (DNL) 0.3 LSB See Figure 16 Drift vs. Temperature2 26 ppm of FS/°C EXCITATION Frequency 16 kHz AC Voltage Across Capacitance ±VDD × 3/8 V To be configured via digital interface Average DC Voltage Across Capacitance VDD/2 V TEMPERATURE SENSOR7 VREF internal Resolution 0.1 °C Error2 ±0.5 ±2 °C Internal temperature sensor ±2 °C External sensing diode8 VOLTAGE INPUT7 VREF internal or VREF = 2.5 V Differential VIN Voltage Range ±VREF V Absolute VIN Voltage2 GND − 0.03 VDD + 0.03 V Integral Nonlinearity (INL) ±3 ±15 ppm of FS No Missing Codes2 24 Bit Conversion time = 122.1 ms Resolution, p-p 16 Bits Conversion time = 62 ms, see Table 6 and Table 7 Output Noise 3 μV rms Conversion time = 62 ms, see Table 6 and Table 7 Offset Error ±3 μV Offset Drift vs. Temperature 15 nV/°C Full-Scale Error2, 9 0.025 0.1 % of FS Full-Scale Drift vs. Temperature 5 ppm of FS/°C Internal reference 0.5 ppm of FS/°C External reference Average VIN Input Current 300 nA/V Analog VIN Input Current Drift ±50 pA/V/°C Power Supply Rejection 80 dB Internal reference, VIN = VREF/2 90 dB External reference, VIN = VREF/2 |
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