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AD590LH bảng dữ liệu(PDF) 11 Page - Analog Devices |
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AD590LH bảng dữ liệu(HTML) 11 Page - Analog Devices |
11 / 16 page AD590 Rev. E | Page 11 of 16 Figure 20 is an example of a current transmitter designed to be used with 40 V, 1 kΩ systems; it uses its full current range of 4 to 20 mA for a narrow span of measured temperatures. In this example, the 1 μA/K output of the AD590 is amplified to 1 mA/°C and offset so that 4 mA is equivalent to 17°C and 20 mA is equivalent to 33°C. RT is trimmed for proper reading at an intermediate reference temperature. With a suitable choice of resistors, any temperature range within the operating limits of the AD590 can be chosen. 30pF V+ 4mA = 17°C 12mA = 25°C 20mA = 33°C – + – + AD581 VOUT RT 5kΩ 10Ω 10kΩ 12.7kΩ 35.7kΩ 5kΩ 500Ω AD590 AD707A – + 0.01µF V– Figure 20. 4 to 20 mA Current Transmitter Figure 21 is an example of a variable temperature control circuit (thermostat) using the AD590. RH and RL are selected to set the high and low limits for RSET. RSET could be a simple pot, a calibrated multiturn pot, or a switched resistive divider. Powering the AD590 from the 10 V reference isolates the AD590 from supply variations while maintaining a reasonable voltage (~7 V) across it. Capacitor C1 is often needed to filter extraneous noise from remote sensors. RB is determined by the β of the power transistor and the current requirements of the load. LM311 – + C1 2 3 4 1 7 10kΩ RSET RL RB RH V– V+ V+ AD590 – + AD581 OUT HEATING ELEMENTS GND 10V Figure 21. Simple Temperature Control Circuit Figure 22 shows that the AD590 can be configured with an 8-bit DAC to produce a digitally controlled setpoint. This particular circuit operates from 0°C (all inputs high) to 51.0°C (all inputs low) in 0.2°C steps. The comparator is shown with 1.0°C hysteresis, which is usually necessary to guard-band for extraneous noise. Omitting the 5.1 MΩ resistor results in no hysteresis. MC 1408/1508 DAC OUT –15V +5V REF OUTPUT HIGH- TEMPERATURE ABOVE SETPOINT OUTPUT LOW- TEMPERATURE BELOW SETPOINT 1.25kΩ +5V +2.5V AD580 20pF BIT 1 BIT 8 BIT 2 BIT 7 BIT 3 BIT 6 BIT 4 BIT 5 1.15kΩ 200Ω 200Ω, 15T 6.98kΩ 1kΩ, 15T –15V AD590 – + –15V +5V +5V 1 4 2 3 8 7 LM311 1kΩ 5.1MΩ 6.8kΩ Figure 22. DAC Setpoint The voltage compliance and the reverse blocking characteristic of the AD590 allow it to be powered directly from 5 V CMOS logic. This permits easy multiplexing, switching, or pulsing for minimum internal heat dissipation. In Figure 23, any AD590 connected to a logic high passes a signal current through the current measuring circuitry, while those connected to a logic zero pass insignificant current. The outputs used to drive the AD590s can be employed for other purposes, but the additional capacitance due to the AD590 should be taken into account. 5V CMOS GATES AD590 1kΩ (0.1%) – + – + – + – + Figure 23. AD590 Driven from CMOS Logic |
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