전자부품 데이터시트 검색엔진 |
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AD590M 데이터시트(PDF) 11 Page - Analog Devices |
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AD590M 데이터시트(HTML) 11 Page - Analog Devices |
11 / 16 page AD590 Rev. C | Page 11 of 16 30pF V+ 4mA = 17°C 12mA = 25°C 20mA = 33°C – + – + AD581 VOUT RT 5k Ω 10 Ω 10k Ω 12.7k Ω 35.7k Ω 5k Ω 500 Ω AD590 AD707A – + 0.01 µF V– Figure 18. 4 mA to 20 mA Current Transmitter Figure 19 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 10k Ω RSET RL RB RH V– V+ V+ AD590 – + AD581 OUT HEATING ELEMENTS GND 10V Figure 19. Simple Temperature Control Circuit Figure 20 shows that the AD590 can be configured with an 8-bit DAC to produce a digitally controlled set point. 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 SET POINT OUTPUT LOW- TEMPERATURE BELOW SET POINT 1.25k Ω +5V +2.5V AD580 20pF BIT 1 BIT 8 BIT 2 BIT 7 BIT 3 BIT 6 BIT 4 BIT 5 1.15k Ω 200 Ω 200 Ω, 15T 6.98k Ω 1k Ω, 15T –15V AD590 – + –15V +5V +5V 1 4 2 3 8 7 LM311 1k Ω 5.1M Ω 6.8k Ω Figure 20. DAC Set Point The voltage compliance and the reverse blocking characteristic of the AD590 allows it to be powered directly from 5 V CMOS logic. This permits easy multiplexing, switching, or pulsing for minimum internal heat dissipation. In Figure 21, 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 may be employed for other purposes, but the additional capacitance due to the AD590 should be taken into account. 5V CMOS GATES AD590 1k Ω (0.1%) – + – + – + – + Figure 21. AD590 Driven from CMOS Logic CMOS analog multiplexers can also be used to switch AD590 current. Due to the AD590’s current mode, the resistance of such switches is unimportant as long as 4 V is maintained across the transducer. Figure 22 shows a circuit that combines the principle demonstrated in Figure 21 with an 8-channel CMOS multiplexer. The resulting circuit can select 1–80 sensors over only 18 wires with a 7-bit binary word. |
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