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AD595ADZ Datenblatt(PDF) 2 Page - Analog Devices |
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AD595ADZ Datenblatt(HTML) 2 Page - Analog Devices |
2 / 8 page AD594/AD595–SPECIFICATIONS REV. C –2– Model AD594A AD594C AD595A AD595C Min Typ Max Min Typ Max Min Typ Max Min Typ Max Units ABSOLUTE MAXIMUM RATING +VS to –VS 36 36 36 36 Volts Common-Mode Input Voltage –VS – 0.15 +VS –VS – 0.15 +VS –VS – 0.15 +VS –VS – 0.15 +VS Volts Differential Input Voltage –VS +VS –VS +VS –VS +VS –VS +VS Volts Alarm Voltages +ALM –VS –VS + 36 –VS –VS + 36 –VS –VS + 36 –VS –VS + 36 Volts –ALM –VS +VS –VS +VS –VS +VS –VS +VS Volts Operating Temperature Range –55 +125 –55 +125 –55 +125 –55 +125 °C Output Short Circuit to Common Indefinite Indefinite Indefinite Indefinite TEMPERATURE MEASUREMENT (Specified Temperature Range 0 °C to +50°C) Calibration Error at +25 °C1 3 1 3 1 °C Stability vs. Temperature 2 0.05 0.025 0.05 0.025 °C/°C Gain Error 1.5 0.75 1.5 0.75 % Nominal Transfer Function 10 10 10 10 mV/ °C AMPLIFIER CHARACTERISTICS Closed Loop Gain 3 193.4 193.4 247.3 247.3 Input Offset Voltage (Temperature in °C) × (Temperature in °C) × (Temperature in °C) × (Temperature in °C) × 51.70 µV/°C 51.70 µV/°C 40.44 µV/°C 40.44 µV/°C µV Input Bias Current 0.1 0.1 0.1 0.1 µA Differential Input Range –10 +50 –10 +50 –10 +50 mV Common-Mode Range –VS – 0.15 –VS – 4 –VS – 0.15 –VS – 4 –VS – 0.15 –VS – 4 –VS – 0.15 –VS – 4 Volts Common-Mode Sensitivity – RTO 10 10 10 10 mV/V Power Supply Sensitivity – RTO 10 10 10 10 mV/V Output Voltage Range Dual Supply –VS + 2.5 +VS – 2 –VS + 2.5 +VS – 2 –VS + 2.5 +VS – 2 –VS + 2.5 +VS – 2 Volts Single Supply 0 +VS – 2 0 –VS – 2 0 +VS + 2 0 +VS – 2 Volts Usable Output Current 4 ±5 ±5 ±5 ±5mA 3 dB Bandwidth 15 15 15 15 kHz ALARM CHARACTERISTICS VCE(SAT) at 2 mA 0.3 0.3 0.3 0.3 Volts Leakage Current 1 1 1 1 µA max Operating Voltage at – ALM +VS – 4 +VS – 4 +VS – 4 +VS – 4 Volts Short Circuit Current 20 20 20 20 mA POWER REQUIREMENTS Specified Performance +VS = 5, –VS = 0 +VS = 5, –VS = 0 +VS = 5, –VS = 0 +VS = 5, –VS = 0 Volts Operating 5 +VS to –VS ≤ 30 +VS to –VS ≤ 30 +VS to –VS ≤ 30 +VS to –VS ≤ 30 Volts Quiescent Current (No Load) +VS 160 300 160 300 160 300 160 300 µA –VS 100 100 100 100 µA PACKAGE OPTION TO-116 (D-14) AD594AD AD594CD AD595AD AD595CD Cerdip (Q-14) AD594AQ AD594CQ AD595AQ AD595CQ NOTES 1Calibrated for minimum error at +25 °C using a thermocouple sensitivity of 51.7 µV/°C. Since a J type thermocouple deviates from this straight line approximation, the AD594 will normally read 3.1 mV when the measuring junction is at 0 °C. The AD595 will similarly read 2.7 mV at 0°C. 2Defined as the slope of the line connecting the AD594/AD595 errors measured at 0 °C and 50°C ambient temperature. 3Pin 8 shorted to Pin 9. 4Current Sink Capability in single supply configuration is limited to current drawn to ground through a 50 k Ω resistor at output voltages below 2.5 V. 5–V S must not exceed –16.5 V. Specifications shown in boldface are tested on all production units at final electrical test. Results from those tests are used to calculate outgoing quality levels. All min and max specifications are guaranteed, although only those shown in boldface are tested on all production units. Specifications subject to change without notic e. (@ +25 C and VS = 5 V, Type J (AD594), Type K (AD595) Thermocouple, unless otherwise noted) INTERPRETING AD594/AD595 OUTPUT VOLTAGES To achieve a temperature proportional output of 10 mV/ °C and accurately compensate for the reference junction over the rated operating range of the circuit, the AD594/AD595 is gain trimmed to match the transfer characteristic of J and K type thermocouples at 25 °C. For a type J output in this temperature range the TC is 51.70 µV/°C, while for a type K it is 40.44 µV/°C. The resulting gain for the AD594 is 193.4 (10 mV/ °C divided by 51.7 µV/°C) and for the AD595 is 247.3 (10 mV/ °C divided by 40.44 µV/°C). In addition, an absolute accuracy trim induces an input offset to the output amplifier characteristic of 16 µV for the AD594 and 11 µV for the AD595. This offset arises because the AD594/ AD595 is trimmed for a 250 mV output while applying a 25 °C thermocouple input. Because a thermocouple output voltage is nonlinear with respect to temperature, and the AD594/AD595 linearly amplifies the compensated signal, the following transfer functions should be used to determine the actual output voltages: AD594 output = (Type J Voltage + 16 µV) × 193.4 AD595 output = (Type K Voltage + 11 µV) × 247.3 or conversely: Type J voltage = (AD594 output/193.4) – 16 µV Type K voltage = (AD595 output/247.3) – 11 µV Table I lists the ideal AD594/AD595 output voltages as a func- tion of Celsius temperature for type J and K ANSI standard thermocouples, with the package and reference junction at 25 °C. As is normally the case, these outputs are subject to cali- bration, gain and temperature sensitivity errors. Output values for intermediate temperatures can be interpolated, or calculated using the output equations and ANSI thermocouple voltage tables referred to zero degrees Celsius. Due to a slight variation in alloy content between ANSI type J and DIN FE-CUNI |
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