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AD215 Arkusz danych(PDF) 4 Page - Analog Devices |
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AD215 Arkusz danych(HTML) 4 Page - Analog Devices |
4 / 12 page AD215 REV. 0 –4– OUT HI TRIM OUT LO +15VIN –15VIN PWR RTN AD215 SIGNAL 1 3 UNCOMMITTED INPUT OP AMP FB IN– IN+ POWER T2 T1 33k Ω R R 0.01µF OUTPUT BUFFER IN COM +VISO –VISO MODULATOR DEMODULATOR LOW-PASS FILTER 150kHz 37 36 38 42 44 43 430kHz POWER OSCILLATOR 6 2 5 ISOLATED DC SUPPLY 4 Figure 1. Functional Block Diagram PIN CONFIGURATIONS 36 38 37 42 44 43 BOTTOM VIEW OF FOOTPRINT 4 6 2 3 5 1 AD215 PIN DESIGNATIONS Pin Designation Function 1 IN+ Noninverting Input 2 IN COM Input Common 3 IN– Inverting Input 4 FB Amplifier Feedback 5–VISO OUT Isolated –15 V dc Power Supply 6+VISO OUT Isolated +15 V dc Power Supply 36 TRIM Output Offset Trim Adjust 37 OUT LO Output Low 38 OUT HI Output High 42 +15 VIN +15 V dc Power 43 PWR RTN ±15 V dc Power Supply Common 44 –15 VIN –15 V dc Power ORDERING GUIDE Model Temperature Range VCMV Nonlinearity * AD215AY –40 °C to +85°C 750 0.01% AD215BY –40 °C to +85°C 1500 0.005% *Typical @ +25 °C, G = 1 V/V. INSIDE THE AD215 The AD215 is a fully self-contained analog signal and power isolation solution. It employs a double-balanced amplitude modulation technique to perform transformer coupling of sig- nals ranging in frequency from true dc values to those having frequencies of 120 kHz or less. To generate the power supplies used for the isolated front-end circuitry, an internal clock oscillator drives the primary winding of the integral dc/dc power supply’s transformer, T2. The resultant voltage developed across the secondary winding is then rectified and filtered for use as the isolated power supply. This built-in isolated dc/dc converter provides sufficient power for both the internal isolated circuit elements of the AD215 as well as any ancillary components supplied by the user. It saves onboard space and component cost where additional amplifica- tion or signal conditioning is required. After an input signal is amplified by the uncommitted op amp, it is modulated at a carrier frequency of approximately 430 kHz and applied across the primary winding of the signal isolation transformer T1. The resultant signal induced on the secondary winding of the transformer is then demodulated and filtered using a low-pass Bessel response filter set at a frequency of 150 kHz. The func- tion of the filter reconstructs the original signal as it appears on the input. The signal transformer design and construction allow non- linearity to be independent of both the specified temperature and gain ranges. After complete reconstruction, the signal is subjected to an off- set trim stage and final output buffer. The trim circuit allows the designer flexibility to adjust for any offset as desired. |
Podobny numer części - AD215_15 |
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Podobny opis - AD215_15 |
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