Datasheet AD7782 (Analog Devices) - 3

(VDD = 2.7 V to 3.6 V or 4.75 V to 5.25 V, REFIN(+) = 2.5 V; REFIN(–) = GND; GND = 0 V; AD7782–SPECIFICATIONS XTAL1/XTAL2 = 32.768 kHz Crystal; all specifications TMIN to TMAX unless otherwise noted.) Parameter AD7782B Unit Test Conditions
ADC CHANNEL SPECIFICATION Output Update Rate 19.79 Hz nom ADC CHANNEL No Missing Codes2 24 Bits min Resolution 16 Bits p-p ±160 mV Range, RANGE = 0 18 Bits p-p ±2.56 V Range, RANGE = 1 Output Noise See Table I 2 × 1 024 . REFIN Integral Nonlinearity ±10 ppm of FSR max Typically 2 ppm FSR = Gain Offset Error ±3 µV typ AIN(+) = AIN(–) = 2.5 V Offset Error Drift vs. Temperature ±10 nV/°C typ Full-Scale Error ±10 µV typ VDD = 3 V Gain Drift vs. Temperature ±0.5 ppm/°C typ Power Supply Rejection (PSR) 100 dB typ Input Range = ± 160 mV, VIN = 1/16 V 85 dB typ Input Range = ± 2.56 V, VIN = 1 V ANALOG INPUTS Differential Input Voltage Ranges ±160 mV nom RANGE = 0 ±2.56 V nom RANGE = 1 ADC Range Matching ±2 µV typ Input Voltage = 159 mV on Both Ranges Absolute AIN Voltage Limits GND + 100 mV V min VDD – 100 mV V max Analog Input Current2 DC Input Current ±1 nA max DC Input Current Drift ±5 pA /°C typ Normal-Mode Rejection2, 3 @ 50 Hz 60 dB min 50 Hz ± 1 Hz @ 60 Hz 94 dB min 60 Hz ± 1 Hz Common-Mode Rejection Input Range = ± 160 mV, VIN = 1/16 V @ DC 105 dB min 125 dB typ, 110 dB typ when Input Range = ± 2.56 V @ 50 Hz2 100 dB min 50 Hz ± 1 Hz @ 60 Hz2 100 dB min 60 Hz ± 1 Hz REFERENCE INPUT REFIN Voltage 2.5 V nom REFIN = REFIN(+) – REFIN(–) REFIN Voltage Range2 1 V min VDD V max Absolute REFIN Voltage Limits2 GND – 30 mV V min VDD + 30 mV V max Average Reference Input Current 0.5 µA/V typ Average Reference Input Current Drift ±0.01 nA/V/°C typ Normal-Mode Rejection2, 3 @ 50 Hz 60 dB min 50 Hz ± 1 Hz @ 60 Hz 94 dB min 60 Hz ± 1 Hz Common-Mode Rejection Input Range = ± 160 mV, VIN = 1/16 V @ DC 100 dB typ @ 50 Hz 110 dB typ 50 Hz ± 1 Hz @ 60 Hz 110 dB typ 60 Hz ± 1 Hz LOGIC INPUTS All Inputs Except SCLK and XTAL12 VINL, Input Low Voltage 0.8 V max VDD = 5 V 0.4 V max VDD = 3 V VINH, Input High Voltage 2.0 V min VDD = 3 V or 5 V SCLK Only (Schmitt-Triggered Input)2 VT(+) 1.4/2 V min/V max VDD = 5 V VT(–) 0.8/1.4 V min/V max VDD = 5 V VT(+) – VT(–) 0.3/0.85 V min/V max VDD = 5 V VT(+) 0.95/2 V min/V max VDD = 3 V VT(–) 0.4/1.1 V min/V max VDD = 3 V VT(+) – VT(–) 0.3/0.85 V min/V max VDD = 3 V –2– REV. A