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ADR318 Scheda tecnica(PDF) 7 Page - Analog Devices |
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ADR318 Scheda tecnica(HTML) 7 Page - Analog Devices |
7 / 8 page REV. 0 ADR318 –7– APPLICATIONS Basic Voltage Reference Connection The circuit in Figure 2 illustrates the basic configuration for the ADR318. Decoupling capacitors are not required for circuit stability. The ADR318 is capable of driving capacitative loads from 0 µF to 10 µF. However, a 0.1 µF ceramic output capacitor is recommended to absorb and deliver the charge as is required by a dynamic load. SHUTDOWN INPUT SHDN ADR318 GND VOUT(F) VOUT(S) VIN CI 0.1 F CO OUTPUT 0.1 F Figure 2. Voltage Reference Connection Precision Negative Voltage Reference without Precision Resistors A negative reference can be easily generated by combining the ADR318 with an op amp. Figure 3 shows this simple negative reference configuration. VOUT(F) and VOUT(S) are at virtual ground and therefore the negative reference can be taken directly from the output of the op amp. The op amp should be a dual-supply, low offset, rail-to-rail amplifier, such as the OP1177. VOUT(S) VOUT(F) ADR318 SHDN +VDD GND –VREF VIN OP1177 –VSS Figure 3. Negative Reference General-Purpose Current Source Many times in low power applications, the need arises for a preci- sion current source that can operate on low supply voltages. As shown in Figure 4, the ADR318 can be configured as a precision current source. The circuit configuration illustrated is a floating current source with a grounded load. The reference’s output voltage is bootstrapped across R1, which sets the output current into the load. With this configuration, circuit precision is maintained for load currents in the range from the reference’s supply current, typically 90 mA to approximately 5 mA. The supply current is a function of ISET and will increase slightly at a given ISET. VOUT(S) ISY (ISET) ISET VOUT(F) ADR318 +VDD GND VIN U1 SHDN 0.1 F R1 RL ISY ADJ IOUT = ISET + ISV (ISET) Figure 4. General-Purpose Current Source |
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