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AD623-EVALZ 数据表(PDF) 2 Page - Analog Devices |
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AD623-EVALZ 数据表(HTML) 2 Page - Analog Devices |
2 / 4 page AD623-EVALZ Rev. 0 | Page 2 of 4 CIRCUIT OPTIONS Single-Supply Operation A jumper is provided to select between single or dual power supplies. The board is shipped with W14 in the dual-supply position. To convert to single supply, place W14 in the position marked with a ground symbol. Gain Adjustment The default gain of the AD623 is unity; installing a resistor at RG enables the adjustment of gain. RG can be calculated according to the following equation, or selected from Table 1: RG = 100 kΩ/(G − 1) Table 1. AD623 Standard Value Gain Resistors Desired Gain 1% Standard Value of RG (Ω) Calculated Gain Using Standard 1% Resistors 2 100 k 2 5 24.9 k 5.02 10 11 k 10.09 20 5.23 k 20.12 33 3.09 k 33.36 40 2.55 k 40.21 50 2.05 k 49.78 65 1.58 k 64.29 100 1.02 k 99.04 200 499 201.4 500 200 501 1000 100 1001 External Reference or Offset Adjustment When shipped, the reference of the AD623-EVALZ is connected to ground. Certain single-supply applications (for example, an analog-to-digital converter (ADC) connected to the AD623’s output) require a symmetrical output voltage centered on a nonzero value. The reference can be equal to half the supply, or an application-specific voltage can be provided by an ADC. The user can install a jumper at W13 and connect an external reference to the EXT_REF pin. To maintain proper operation of the in-amp, the reference should be provided by a voltage source. Similarly, a provision is made for an offset adjustment of ±1.12 V by installing the parts listed in Table 4. Although the A2 and A3 ICs can be used with a single or dual power supply connection, A1 requires a dual supply. To enable the offset feature, install a shunt in Position W11. To adjust the offset of the AD623, ground both inputs and measure the output voltage. Adjust Potentiometer R1 for 0 V. LOAD RESISTOR Although a load resistor is not required for normal operation, one can be inserted at Position R8. GUARD DRIVERS When interference from sources such as power lines must be reduced to levels below those provided by standard shielded cable, guard drivers may be effective. A guard equalizes the ac potential between the in-amp input and the cable shield of the line, effectively reducing the low frequency interference voltage. A1 in Figure 2 is a dual op amp AD708 driving the shield(s) of the input cable(s) from the AD623’s gain resistor pins. The voltages at these pins are equal to the input voltages plus 0.6 V (refer to the AD623 data sheet.) The AD623-EVALZ provides single and differential guards. Differential guards drive the shields with essentially the same signals as the inputs, whereas the single guard can be used for dual conductor cables. In this mode, the +GUARD drives the shield at ½(VIN DIFF) + 0.6 V. To activate the guard drivers, +VAUX and –VAUX must be connected. For shielded cables at both inputs, install the W1, W2, W8, and W5 jumpers. Using a Single Guard For gains greater than 1, Resistors R6 and R11 (which are each half the calculated resistance of RG), and the W1, W2, and W10 jumpers are installed. For a gain of 1, either Position R6 or Position R11 can be shorted to enable the guard driver input. Connect the shield to +GUARD. On the header pins that do not bear the ground symbol, insert a shunt across Position W1. The guard drivers can be assembled using the components listed in Table 4. INPUT POWER OUTPUT Figure 2. Component Location of In-Amp Evaluation Board |
类似零件编号 - AD623-EVALZ |
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类似说明 - AD623-EVALZ |
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