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AD215BY Fiches technique(PDF) 10 Page - Analog Devices |
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AD215BY Fiches technique(HTML) 10 Page - Analog Devices |
10 / 12 page AD215 REV. 0 –10– When gain setting resistors are used, 0.325" channel centers can still be achieved as shown in Figure 20b. RG R F C F C2 C1 1 2 3 4 5 6 IN IN COM +VISO –VISO C1, C2 ARE V ISO FILTER CAPACITORS. R F, RG ARE FEEDBACK, GAIN RESISTORS. C F IS A FEEDBACK BYPASS CAPACITOR. RG R F C F C2 C1 1 2 3 4 5 6 IN IN COM +VISO –VISO Figure 20b. PCB Layout for Gain Greater than Unity APPLICATIONS EXAMPLES Motor Control Figure 21 shows an AD215 used in a dc motor control applica- tion. Its excellent phase characteristics and wide bandwidth are ideal for this type of application. 1 3 4 38 37 AD215 MOTOR COMMAND ±10 VOLTS 2 COM G = 1 ISOLATED MOTOR COMMAND ±10V V C OUT LO SHAFT θ IMOTOR MOTOR OPTICAL RESOLVER OR TACHOMETER ENCODER ENCODER FEEDBACK MOTOR CONTROL UNIT Figure 21. Motor Control Application Multichannel Data Acquisition The current drive capabilities of the AD215’s bipolar ±15 V dc isolated power supply is more than adequate to meet the modest ±800 µA supply current requirements for the AD7502 multi- plexer. Digital isolation techniques should be employed to iso- late the Enable (EN), A0 and A1 logic control signals. IN+ IN– FB IN COM OUT HI OUT LO 1 3 4 AD215 PWR RTN –15V +15V +VISO –VISO 6.8µF 6 6.8µF G = 1 42 38 (–15V) GND (+15V) EN A1 A0 AD7502 37 2 5 2 COM 43 44 S1 – S4 S5 – S8 DTL/TTL TO CMOS LEVEL TRANSLATOR DECODER/DRIVER Figure 22. Multichannel Data Acquisition Application AC Transducer Applications In applications such as vibration analysis, where the user must acquire and process the spectral content of a sensor’s signal rather than its “dc” level, the wideband characteristics of the AD215 prove most useful. Key specifications for ac transducer applications include bandwidth, slew rate and harmonic distor- tion. Since the transducer may be mechanically bonded or welded to the object under test, isolation is typically required to eliminate ground loops as well as protect the electronics used in the data acquisition system. Figure 23 shows an isolated strain gage circuit employing the AD215 and a high speed operational amplifier (AD744). To alleviate the need for an instrumentation amplifier, the bridge is powered by a bipolar excitation source. Under this ap- proach the common-mode voltage is ±V SPAN which is typically only a few millivolts, rather than the VEXC 2 that would be achieved with a unipolar excitation source and Wheatstone bridge configuration. Using two strain gages with a gage factor of 3 mV/V and a ±1.2 V excitation signal, a ±6.6 mV output signal will result. A gain setting of 454 will scale this low level signal to ±3 V, which can then be digitized by a high speed, 100 kHz sampling ADC such as the AD7870. The low voltage excitation is used to permit the front-end cir- cuitry to be powered from the isolated power supplies of the AD215, which can supply up to ±10 mA of isolated power at ±15 V. The bridge draws only 3.5 mA, leaving sufficient cur- rent to power the micropower dual BiFET (400 µA quiescent current) and the high speed AD744 BiFET amplifier (4 mA quiescent current). |
Numéro de pièce similaire - AD215BY |
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Description similaire - AD215BY |
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