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ADR280 数据表(PDF) 8 Page - Analog Devices |
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ADR280 数据表(HTML) 8 Page - Analog Devices |
8 / 12 page ADR280 Rev. C | Page 8 of 12 APPLICATIONS INFORMATION The ADR280 should be decoupled with a 0.1 μF ceramic capacitor at the output for optimum stability. It is also good practice to include 0.1 μF ceramic capacitors at the IC supply pin. These capacitors should be mounted close to their respective pins (see Figure 12). V+ V– ADR280 VOUT 0.1µF 0.1µF Figure 12. Basic Configuration The low supply voltage input pin V− can be elevated above ground; a 1.2 V differential voltage can therefore be established above V− (see Figure 13). V+ V– ADR280 5V 1.2V + V– 2.5V VOUT 0.1µF 0.1µF Figure 13. Floating References The ADR280 provides the core 1.2 V band gap voltage and is able to drive a maximum load of only 100 μA. Users can simply buffer the output for high current or sink/source current applica- tions, such as ADC or LCD driver references (see Figure 14). V+ ADR280 U1 U2 VOUT V– 0.1µF VOUT 0.1µF U2 = AD8541, SC70 AD8601, SOT-23-5 Figure 14. Buffered Output Users can also tailor any specific need for voltage and dynamics with an external op amp and discrete components (see Figure 14 and Figure 15). Depending on the specific op amp and PCB layout, it may be necessary to add a compensation capacitor, C2, to prevent gain peaking and oscillation. The exact value of C2 needed requires some trial and error but usually falls in the range of a few picofarads. V+ V– ADR280 U1 5V 5V 1.2V U2 1.8V C2 2.2pF V+ V– AD8541 C1 0.1µF VOUT + – VO R2 60kΩ ± 0.1% R1 120kΩ ± 0.1% Figure 15. 1.8 V Reference LOW COST, LOW POWER CURRENT SOURCE Because of its low power characteristics, the ADR280 can be converted to a current source with just a setting resistor. In addition to the ADR280 current capability, the supply voltage and the load limit the maximum current. The circuit in Figure 16 produces 100 μA with 2 V compliance at a 5 V supply. The load current is the sum of ISET and IGND. IGND increases slightly with load; a RSET of 13.6 kΩ yields 100 μA of load current. V+ V– ADR280 U1 5V C1 0.1µF RL 1kΩ + – ISET VOUT 13.6kΩ RSET 1.2V IGND IL =ISET +IGND IL 100µA Figure 16. Low Cost Current Source Precision Low Power Current Source By adding a buffer to redirect the IGND in Figure 17, a current can be precisely set by RSET with the equation IL = 1.2 V/RSET. V+ V– ADR280 U1 5V V+ V– 5V U2 AD8541 – + VOUT C2 0.1µF RSET 12kΩ RL 1kΩ IL 100µA IL =1.2V/RSET Figure 17. Precision Low Power Current Source |
类似零件编号 - ADR280_07 |
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类似说明 - ADR280_07 |
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