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AD580J 数据表(PDF) 3 Page - Analog Devices |
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AD580J 数据表(HTML) 3 Page - Analog Devices |
3 / 6 page AD580 REV. A –3– ABSOLUTE MAXIMUM RATINGS Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 V Power Dissipation @ +25 °C Ambient Temperature . . . . . . . . . . . . . . . . . . . . . . . 350 mW Derate above +25 °C . . . . . . . . . . . . . . . . . . . . . . . 2.8 mW/°C Lead Temperature (Soldering 10 sec) . . . . . . . . . . . . . +300 °C Thermal Resistance Junction-to-Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 °C Junction-to-Ambient . . . . . . . . . . . . . . . . . . . . . . . 360 °C/W AD580 CHIP DIMENSIONS AND PAD LAYOUT Dimensions shown in inches and (mm). The AD580 is also available in chip form. Consult the factory for specifications and applications information. THEORY OF OPERATION The AD580 family (AD580, AD581, AD584, AD589) uses the “bandgap” concept to produce a stable, low temperature coefficient voltage reference suitable for high accuracy data ac- quisition components and systems. The device makes use of the underlying physical nature of a silicon transistor base-emitter voltage in the forward-biased operating region. All such transis- tors have approximately a –2 mV/ °C temperature coefficient, unsuitable for use directly as a low TC reference; however, extrapolation of the temperature characteristic of any one of these devices to absolute zero (with emitter current proportional to absolute temperature) reveals that it will go to a VBE of 1.205 volts at 0K, as shown in Figure 1. Thus, if a voltage could be developed with an opposing temperature coefficient to sum with VBE to total 1.205 volts, a zero-TC reference would result and operation from a single, low voltage supply would be possible. The AD580 circuit provides such a compensating voltage, V1 in Figure 2, by driving two transistors at different current densities and amplifying the resulting VBE difference (∆VBE—which now has a positive TC); the sum (VZ) is then buffered and amplified up to 2.5 volts to provide a usable reference-voltage output. Fig- ure 3 is the schematic diagram of the AD580. The AD580 operates as a three-terminal reference, which means that no additional components are required for biasing or cur- rent setting. The connection diagram, Figure 4 is quite simple. Figure 1. Extrapolated Variation of Base-Emitter Voltage with Temperature (IEαT), and Required Compensation, Shown for Two Different Devices Figure 2. Basic Bandgap-Reference Regulator Circuit |
类似零件编号 - AD580J |
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类似说明 - AD580J |
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