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ADR510ARTZ-REEL7 データシート(PDF) 8 Page - Analog Devices |
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ADR510ARTZ-REEL7 データシート(HTML) 8 Page - Analog Devices |
8 / 12 page ADR510 Rev. B | Page 8 of 12 APPLICATIONS INFORMATION The ADR510 is a 1.0 V precision shunt voltage reference designed to operate without an external output capacitor between the positive terminal and the negative terminal for stability. An external capacitor can be used for additional filtering of the supply. As with all shunt voltage references, an external bias resistor (RBIAS) is required between the supply voltage and the ADR510 (see Figure 2). RBIAS sets the current that is required to pass through the load (IL) and the ADR510 (IQ). The load and the supply voltage can vary, thus RBIAS is chosen based on the following conditions: • RBIAS must be small enough to supply the minimum IQ current to the ADR510 even when the supply voltage is at minimum value and the load current is at maximum value. • RBIAS also needs to be large enough so that IQ does not exceed 10 mA when the supply voltage is at its maximum value and the load current is at its minimum value. Given these conditions, RBIAS is determined by the supply voltage (VS), the load and operating current (IL and IQ) of the ADR510, and the ADR510 output voltage. Q L OUT S BIAS I I V V R + − = (3) ADJUSTABLE PRECISION VOLTAGE SOURCE The ADR510, combined with a precision low input bias op amp such as the AD860x, can be used to output a precise adjustable voltage. Figure 11 illustrates implementation of this application using the ADR510. Output of the op amp, VOUT, is determined by the gain of the circuit, which is completely dependent on the R2 and R1 resistors. R1 R2 V OUT + = 1 (4) An additional capacitor in parallel with R2 can be added to filter out high frequency noise. The value of C2 is dependent on the value of R2. VCC VOUT = (1 + R2/R1) RBIAS ADR510 1.0V AD860x R2 R1 C2 (OPTIONAL) Figure 11. Adjustable Precision Voltage Source OUTPUT VOLTAGE TRIM Using a mechanical or digital potentiometer, the output voltage of the ADR510 can be trimmed ±0.5%. The circuit in Figure 12 illustrates how the output voltage can be trimmed using a 10 kΩ potentiometer. Note that trimming using other resistor values may not produce an accurate output from the ADR510. VCC VOUT RBIAS ADR510 POT 10kΩ R1 470kΩ 1 2 3 Figure 12. Output Voltage Trim USING THE ADR510 WITH PRECISION DATA CONVERTERS The compact ADR510 and its low minimum operating current requirement make it ideal for use in battery-powered portable instruments, such as the AD7533 CMOS multiplying DAC, that use precision data converters. Figure 13 shows the ADR510 serving as an external reference to the AD7533, a CMOS multiplying DAC. Such a DAC requires a negative voltage input in order to provide a positive output range. In this application, the ADR510 is supplying a −1.0 V reference to the REF input of the AD7533. 0 1 VDD MSB GN 9 LSB VOUT = 0V TO 1.0V + – AD7533 –VDD R2 ADR510 + – 1 32 1 15 Figure 13. ADR510 as a Reference for a 10-Bit CMOS DAC (AD7533) |
同様の部品番号 - ADR510ARTZ-REEL7 |
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同様の説明 - ADR510ARTZ-REEL7 |
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