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AD215 데이터시트(PDF) 9 Page - Analog Devices |
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AD215 데이터시트(HTML) 9 Page - Analog Devices |
9 / 12 page AD215 REV. 0 –9– Input Gain Adjustments for the Inverting Mode Figure 17 shows a suggested inverting gain adjustment circuit. In this circuit, gain adjustment is made using a potentiometer (RP) in the feedback loop. The adjustments are effective for all gains in the 1 to 10 V/V range. VSIGNAL RF RC RIN 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 1k Ω Figure 17. Gain Adjustment for Inverting Configuration For an approximate ±1% gain trim range, RX = RIN × RF RIN + RF and select RC = 0.02 × R IN while RF < 10 k Ω CF = 47 pF Note: RF and RIN should have matched temperature coefficient drift characteristics. Output Offset Adjustments Figure 18 illustrates one method of adjusting the output offset voltage. Since the AD215 exhibits a nominal output offset of –35 mV, the circuit shown was chosen to yield an offset correc- tion of 0 mV to +73 mV. This results in a total output offset range of approximately –35 mV to +38 mV. IN+ IN– FB IN COM OUT HI OUT LO COM TRIM LOW-PASS FILTER, (150k Ω) 1 3 4 2 38 AD215 RT 1M Ω RS 100k Ω RP2 10k Ω OUTPUT BUFFER 33k Ω 0.01µF 37 36 42 +15VIN PWR RTN –15VIN 44 43 2.2µF 2.2µF –15V dc +15V dc Figure 18. Output Offset Adjustment Circuit Output Gain Adjustments Since the output amplifier stage of the AD215 is fixed at unity gain, any adjustments can be made only in a subsequent stage. USING ISOLATED POWER Each AD215 provides an unregulated, isolated bipolar power source of ±15 V dc @ ±10 mA, referred to the input common. This source may be used to power various ancillary components such as signal conditioning and/or adjustment circuitry, refer- ences, op amps or remote transducers. Figure 19 shows typical connections. IN+ IN– FB IN COM OUT HI OUT LO COM TRIM 1 3 4 2 AD215 37 36 +VS PWR RTN –VS 43 2.2µF 2.2µF –15V dc +15V dc +VISO –VISO C1 6.8µF 6 C2 6.8µF 5 1.5k Ω 1.5k Ω LOAD ISOLATED DC SUPPLY 430kHz POWER OSCIL- LATOR OUTPUT FILTER, BUFFER AND TRIM CIRCUITRY 42 44 38 Figure 19. Using the Isolated Power Supplies PCB LAYOUT FOR MULTICHANNEL APPLICATIONS The pin out of the AD215 has been designed to easily facilitate multichannel applications. Figure 20a shows a recommended circuit board layout for a unity gain configuration. 38 36 42 44 37 43 38 36 42 44 37 43 38 36 42 44 37 43 38 36 42 44 37 43 2.2µF 2.2µF 2.2µF 2.2µF +15V dc –15V dc PWR RTN SUPPLY BYPASS CAPACITORS FOR EVERY FOUR AD215s OUT HI0 TRIM 0 OUT HI1 TRIM 1 OUT HI2 TRIM 2 OUT HI3 TRIM 3 ANALOG STAR GROUND Figure 20a. PCB Layout for Unity Gain CAUTION The AD215 design does not provide short-circuit protection of its isolated power supply. A current limiting resistor should be placed in series with the supply terminals and the load in order to protect against inadvertent shorts. |
유사한 부품 번호 - AD215_15 |
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유사한 설명 - AD215_15 |
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