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AS1520-BTST Datasheet(PDF) 6 Page - ams AG |
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AS1520-BTST Datasheet(HTML) 6 Page - ams AG |
6 / 29 page www.austriamicrosystems.com Revision 1.00 6 - 29 AS1520/AS1521 Data Sheet - El ectrical Characte ristics CBYPREF ADJ Capacitive Bypass at REFADJ 0.01 10 µF REFADJ Output Voltage 1.22 V REFADJ Input Range For small adjustments, from 1.22V ±100 mV REFADJ Buffer Disable Threshold To power down the internal reference 1.4 VDD1 - 1 V Buffer Voltage Gain 2.045 V/V External Reference: Reference buffer disabled, reference applied to pin REF REF Input Voltage Range 8 1.0 VDD1 + 50mV V REF Input Current VREF = 2.50V, fSCLK = 6.4MHz 200 350 µA VREF = 2.50V, fSCLK = 0 320 Power-Down, fSCLK = 0 5 Digital Inputs: DIN, SCLK, CSN VINH Input High Voltage 0.7 x VDD V VINL Input Low Voltage 0.3 x VDD V VHYST Input Hysteresis 0.2 V IIN Input Leakage VIN = 0 or VDD2 -1 +1 µA CIN Input Capacitance 5 pF Digital Outputs: DOUT, SSTRB VOL Output Voltage Low ISINK = 5mA 0.4 V VOH Output Voltage High ISOURCE = 1mA 4 V IL Tri-State Leakage Current CSN = VDD2 -10 +10 µA COUT Tri-State Output Capacitance CSN = VDD2 5 pF Power Supply VDD1, VDD2, VDD3 Positive Supply Voltage 9 4.5 5.5 V IVDD1, IVDD2, IVDD3 Supply Current VDD1 = VDD2 = VDD3 = 5.5V Normal Operation with External Reference 10 2.8 3.3 mA Normal Operation with Internal Reference 10 3.3 3.8 Reduced-Power Mode 11 0.4 0.8 Full Power-Down Mode 0.5 2 µA PSR Power-Supply Rejection VDD1 = VDD2 = VDD3 = 5V ±10% -2 ±0.1 +2 mV 1. Tested at VDD1 = VDD2 = VDD3 = +5V, COM = GND, bit RANGE (page 15) = 1, single-ended input mode. 2. Relative accuracy is the deviation of the analog value at any code from its theoretical value after the gain error and offset error have been nulled. 3. Offset nulled. 4. Ground on channel; sinewave applied to all off channels. 5. Conversion time is defined as the number of clock cycles multiplied by the clock period; clock has 50% duty cycle. 6. The absolute voltage range for the analog inputs (CH0:CH7, and COM) is from GND to VDD1. 7. External load should not change during conversion for specified accuracy. Guaranteed specification of 4mV/mA is a result of production test limitations. 8. AS1520/AS1521 performance is limited by the device noise floor, typically 300µVp-p. Table 3. AS1520 Electrical Characteristics (Continued) Symbol Parameter Conditions Min Typ Max Units |
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