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AD210JN Folha de dados(PDF) 3 Page - Analog Devices |
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AD210JN Folha de dados(HTML) 3 Page - Analog Devices |
3 / 8 page AD210 REV. A –3– INSIDE THE AD210 The AD210 basic block diagram is illustrated in Figure 1. A +15 V supply is connected to the power port, and ±15 V isolated power is supplied to both the input and output ports via a 50 kHz carrier frequency. The uncom- mitted input amplifier can be used to supply gain or buff- ering of input signals to the AD210. The fullwave modulator translates the signal to the carrier frequency for application to transformer T1. The synchronous demodu- lator in the output port reconstructs the input signal. A 20 kHz, three-pole filter is employed to minimize output noise and ripple. Finally, an output buffer provides a low impedance output capable of driving a 2 k Ω load. INPUT POWER SUPPLY 19 14 15 16 17 18 VO 30 29 T2 POWER POWER OSCILLATOR INPUT OUTPUT MOD DEMOD FILTER 1 2 OUTPUT POWER SUPPLY 3 4 OCOM +VOSS –VOSS AD210 PWR COM PWR T3 T1 –VISS +VISS ICOM +IN –IN FB Figure 1. AD210 Block Diagram USING THE AD210 The AD210 is very simple to apply in a wide range of ap- plications. Powered by a single +15 V power supply, the AD210 will provide outstanding performance when used as an input or output isolator, in single and multichannel configurations. Input Configurations: The basic unity gain configura- tion for signals up to ±10 V is shown in Figure 2. Addi- tional input amplifier variations are shown in the following figures. For smaller signal levels Figure 3 shows how to obtain gain while maintaining a very high input impedance. 19 14 15 16 17 18 VOUT ( ±10V) 30 29 +VOSS VSIG ±10V AD210 +VISS –VISS +15V 2 3 4 –VOSS 1 VOUT Figure 2. Basic Unity Gain Configuration The high input impedance of the circuits in Figures 2 and 3 can be maintained in an inverting application. Since the AD210 is a three-port isolator, either the input leads or the output leads may be interchanged to create the signal inversion. 19 14 15 16 17 18 30 29 +VOSS VSIG AD210 +VISS –VISS +15V 2 3 4 –VOSS 1 VOUT = VSIG 1+ ( ) RF RG RG RF Figure 3. Input Configuration for G > 1 Figure 4 shows how to accommodate current inputs or sum cur- rents or voltages. This circuit configuration can also be used for signals greater than ±10 V. For example, a ±100 V input span can be handled with RF = 20 k Ω and R S1 = 200 k Ω. 19 14 15 16 17 18 30 29 +VOSS AD210 +VISS –VISS +15V 2 3 4 –VOSS 1 RS1 IS VS2 VS1 RS2 RF VOUT VOUT = –RF VS1 RS1 ( ) VS2 RS2 + + IS + ... Figure 4. Summing or Current Input Configuration Adjustments When gain and offset adjustments are required, the actual cir- cuit adjustment components will depend on the choice of input configuration and whether the adjustments are to be made at the isolator’s input or output. Adjustments on the output side might be used when potentiometers on the input side would represent a hazard due to the presence of high common-mode voltage during adjustment. Offset adjustments are best done at the input side, as it is better to null the offset ahead of the gain. Figure 5 shows the input adjustment circuit for use when the in- put amplifier is configured in the noninverting mode. This offset adjustment circuit injects a small voltage in series with the 19 15 16 17 18 30 29 +VOSS AD210 +VISS –VISS +15V 2 3 4 –VOSS RG HI VOUT VSIG 14 200 Ω 47.5k Ω 5k Ω 100k Ω 50k Ω LO GAIN OFFSET 1 Figure 5. Adjustments for Noninverting Input |
Nº de peça semelhante - AD210JN |
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Descrição semelhante - AD210JN |
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