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AD7738BRU Arkusz danych(PDF) 2 Page - Analog Devices |
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AD7738BRU Arkusz danych(HTML) 2 Page - Analog Devices |
2 / 28 page REV. 0 –2– AD7738–SPECIFICATIONS Parameter Min Typ Max Unit Test Conditions/Comment ADC PERFORMANCE— CHOPPING ENABLED Conversion Time Rate 372 12190 Hz Configure via Conversion Time Register No Missing Codes 1 24 Bits FW ≥ 6 (Conversion Time ≥ 165 µs) See Typical Performance Characteristics Output Noise See Table I Resolution See Tables II and III Integral Nonlinearity (INL) ±0.0015 % of FSR AIN Range = ±2.5 V ±0.0015 % of FSR AIN Range = ±1.25 V Offset Error (Unipolar, Bipolar) 2 ±10 µV Before Calibration Offset Drift vs. Temperature 1 ±280 nV/ °C Gain Error 2 ±0.2 % Before Calibration Gain Drift vs. Temperature 1 ±2.5 ppm of FS/ C Positive Full-Scale Error 2 ±0.2 % of FSR Before Calibration Positive Full-Scale Drift vs. Temperature 1 ±2.5 ppm of FS/ C Bipolar Negative Full-Scale Error 3 ±0.0030 % of FSR After Calibration 3 Common-Mode Rejection 80 100 dB At DC, AIN = 1 V Power Supply Rejection 70 80 dB At DC, AIN = 1 V ADC PERFORMANCE— CHOPPING DISABLED Conversion Time Rate 737 15437 Hz Configure via Conversion Time Register No Missing Codes 1 24 Bits FW ≥ 8 (Conversion Time ≥ 117 µs) See Typical Perfomance Charateristics Output Noise See Table IV Resolution See Tables V and VI Integral Nonlinearity (INL) ±0.0015 % of FSR Offset Error (Unipolar, Bipolar) 4 ± 1mV Before Calibration Offset Drift vs. Temperature ±1.5 µV/ C Gain Error 2 ±0.2 % Before Calibration Gain Drift vs. Temperature ±2.5 ppm of FS/ C Positive Full-Scale Error 2 ±0.2 % of FSR Before Calibration Positive Full-Scale Drift vs. Temperature ±2.5 ppm of FS/ C Bipolar Negative Full-Scale Error 3 ±0.0030 % of FSR After Calibration 3 Common-Mode Rejection 75 dB At DC, AIN = 1 V Power Supply Rejection 65 dB At DC, AIN = 1 V ANALOG INPUTS Analog Input Voltage Ranges 1, 5 ±2.5 V Range –2.9 ±2.5 +2.9 V +2.5 V Range 0 0 to 2.5 2.9 V ±1.25 V Range –1.45 ±1.25 +1.45 V +1.25 V Range 0 0 to 1.25 1.45 V ±0.625 V Range –725 ±625 +725 mV +0.625 V Range 0 0 to 625 725 mV AIN, AINCOM Common-Mode Voltage 1 0.2 AVDD – 0.3 V AIN, AINCOM Input Current 6 200 nA Only One Channel, Chop Disabled AIN to MUXOUT On Resistance 1 200 Ω REFERENCE INPUT REFIN(+) to REFIN(–) Voltage 1, 7 2.475 2.5 2.525 V NOREF Trigger Voltage 0.5 V NOREF Bit in Channel Status Register REFIN(+), REFIN(–) Common-Mode Voltage 1 0AVDD V Reference Input Current 8 400 µA SYSTEM CALIBRATION1, 9 Full Scale Calibration Limit +1.05 FS V Zero Scale Calibration Limit –1.05 FS V Input Span 0.8 FS 2.1 FS V (–40 C to +105 C, AVDD = 5 V 5%, DVDD = 2.7 V to 3.6 V or 5 V 5%, REFIN(+) = 2.5 V, REFIN(–) = 0 V, AINCOM = 2.5 V, MUXOUT(+) = ADCIN(+), MUXOUT(–) = ADCIN(–), Internal Buffer ON, AIN Range = 1.25 V, fMCLK = 6.144 MHz; unless otherwise noted.) |
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