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AD215BY データシート(PDF) 7 Page - Analog Devices |
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AD215BY データシート(HTML) 7 Page - Analog Devices |
7 / 12 page AD215 REV. 0 –7– POWERING THE AD215 The AD215 is powered by a bipolar ±15 V dc power supply connected as shown in Figure 11. External bypass capacitors should be provided in bused applications. Note that a small signal-related current (50 mA/VOUT) will flow out of the OUT LO pin (Pin 37). Therefore, the OUT LO terminals should be bused together and referenced at a single “Analog Star Ground” to the ±15 V dc supply common as illustrated Figure 11. AD215N AD2151 OUT LON NTH CHANNEL 1ST CHANNEL ANALOG STAR GROUND OUT LO1 SIG COM +VIN PWR RTN –VIN +15V dc COM –15V dc 2.2µF 37 42 43 44 42 44 43 2.2µF 37 Figure 11. Typical Power Supply Connections Power Supply Voltage Considerations The rated performance of the AD215 remains unaffected for power supply voltages in the ±14.5 V dc to ±16.5 V dc range. Voltages below ±14.25 V dc may cause the AD215 to cease op- erating properly. Note: Power supply voltages greater than ±17.5 V dc may damage the internal components and consequently should not be used. USING THE AD215 Unity Gain Input Configuration The basic unity gain configuration for input signals of up to ±10 V is shown in Figure 12. RIN = 2kΩ VSIGNAL IN+ IN– FB IN COM OUT HI OUT LO PWR RTN COM TRIM OUTPUT FILTER, BUFFER AND TRIM CIRCUITRY 1 3 4 2 38 36 37 43 AD215 Figure 12. Basic Unity Gain Noninverting Configuration for Gain Greater Than Unity Figure 13 shows how to achieve a gain greater than one while continuing to preserve a very high input impedance. A recom- mended PC board layout for multichannel applications is shown in Figure 20b. RIN = 2kΩ VSIGNAL IN+ IN– FB IN COM OUT HI OUT LO PWR RTN COM TRIM OUTPUT FILTER, BUFFER AND TRIM CIRCUITRY 1 3 4 2 38 36 37 43 AD215 CF 47pF RF RG Figure 13. Noninverting Input Configuration for Gain > 1 V/V In this circuit, the gain equation is as follows: VO = (1 + RF/RG) × VSIG where: VO = Output Voltage (V) VSIG = Input Signal Voltage (V) RF = Feedback Resistor Value ( Ω) RG = Gain Resistor Value ( Ω) The values for resistors RF and RG are subject to the following constraints: • The total impedance of the gain network should be less than 10 k Ω. • The current drawn in RF is less than 1 mA at ±10 V. Note that for each mA drawn by the feedback resistor, the isolated power supply drive capability decreases by 1 mA. • Amplifier gain is set by the feedback (RF) and gain resistor (RG). It is recommended that RF is bypassed with a 47 pF capacitor as shown. Note: The 2 k Ω input resistor (R IN) in series with the input signal source and the IN+ terminal in Figures 12 and 13 is rec- ommended to limit the current at the input terminals of the to 5.0 mA when the AD215 is not powered. |
同様の部品番号 - AD215BY |
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同様の説明 - AD215BY |
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