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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AD7851AR датащи(PDF) 2 Page - Analog Devices |
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AD7851AR датащи(HTML) 2 Page - Analog Devices |
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2 / 36 page  REV. A –2– AD7851–SPECIFICATIONS1, 2 A Grade: fCLKIN = 7 MHz (–40 C to +85 C), fSAMPLE = 333 kHz; K Grade: fCLKIN = 6 MHz (0 C to +85 C), fSAMPLE = 285 kHz; A and K Grade: fCLKIN = 5 MHz (to +125 C), fSAMPLE = 238 kHz; (AVDD = DVDD = +5.0 V 5%, REFIN/REFOUT = 4.096 V External Reference; SLEEP = Logic High; TA = TMIN to TMAX, unless otherwise noted) Parameter A 1 K 1 Units Test Conditions/Comments DYNAMIC PERFORMANCE Signal-to-Noise + Distortion Ratio 3 (SNR) 77 78 dB min Typically SNR is 79.5 dB VIN = 10 kHz, Sine Wave, fSAMPLE = 333 kHz Total Harmonic Distortion (THD) –86 –86 dB max VIN = 10 kHz, Sine Wave, fSAMPLE = 333 kHz, Typically –96 dB Peak Harmonic or Spurious Noise –87 –87 dB max VIN = 10 kHz, fSAMPLE = 333 kHz Intermodulation Distortion (IMD) Second Order Terms –86 –90 dB typ fa = 9.983 kHz, fb = 10.05 kHz, fSAMPLE = 333 kHz Third Order Terms –86 –90 dB typ fa = 9.983 kHz, fb = 10.05 kHz, fSAMPLE = 333 kHz Full Power Bandwidth 20 20 MHz typ @ 3 dB DC ACCURACY Resolution 14 14 Bits Integral Nonlinearity ± 2 ± 1 LSB max Differential Nonlinearity ± 2 ± 1 LSB max Guaranteed No Missed Codes to 14 Bits Unipolar Offset Error ±10 ±10 LSB max Review: “Adjusting the Offset Calibration Positive Full-Scale Error ±10 ±10 LSB max Register” in the “Calibration Registers” section Negative Full-Scale Error ±10 ±10 LSB typ of the data sheet. Bipolar Zero Error ± 1 ± 1 LSB typ ANALOG INPUT Input Voltage Ranges 0 V to VREF 0 V to VREF Volts i.e., AIN(+) – AIN(–) = 0 V to VREF, AIN(–) can be biased up but AIN(+) cannot go below AIN(–). ±V REF/2 ±V REF/2 Volts i.e., AIN(+) – AIN(–) = –VREF/2 to +VREF/2, AIN(–) should be biased up and AIN(+) can go below AIN(–) but cannot go below 0 V. Leakage Current ± 1 ± 1 µA max Input Capacitance 20 20 pF typ REFERENCE INPUT/OUTPUT REFIN Input Voltage Range 4/VDD 4/VDD V min/max Functional from 1.2 V Input Impedance 150 150 k Ω typ Resistor Connected to Internal Reference Node REFOUT Output Voltage 3.696/4.496 3.696/4.496 V min/max REFOUT Tempco 50 50 ppm/ °C typ LOGIC INPUTS Input High Voltage, VINH VDD – 1.0 VDD – 1.0 V min Input Low Voltage, VINL 0.4 0.4 V max Input Current, IIN ±10 ±10 µA max VIN = 0 V or VDD Input Capacitance, CIN 5 10 10 pF max LOGIC OUTPUTS Output High Voltage, VOH VDD – 0.4 VDD – 0.4 V min ISOURCE = 200 µA Output Low Voltage, VOL 0.4 0.4 V max ISINK = 0.8 mA Floating-State Leakage Current ±10 ±10 µA max Floating-State Output Capacitance 5 10 10 pF max Output Coding Straight (Natural) Binary Unipolar Input Range 2s Complement Bipolar Input Range CONVERSION RATE Conversion Time 2.78 3.25 µs max 19.5 CLKIN Cycles Conversion + T/H Acquisition Time 3.0 3.5 µs max 21 CLKIN Cycles Throughput Rate |
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