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ISL28233MSOPEVAL2Z Arkusz danych(PDF) 2 Page - Intersil Corporation |
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ISL28233MSOPEVAL2Z Arkusz danych(HTML) 2 Page - Intersil Corporation |
2 / 4 page 2 AN1569.1 October 5, 2010 Amplifier Configuration (Figure 3) The schematic of the op amp input stage with the components supplied is shown in Figure 3, with a closed loop gain of 10,000. The circuit implements a Hi-Z differential input with unbalanced common mode impedance. The differential amplifier gain is expressed in Equation 1: For single-ended input with an inverting gain G = -10,000V/V, the IN+ input is grounded and the signal is supplied to the IN- input. VREF must be connected to a reference voltage between the V+ and V- supply rails. For non-inverting operation with G = 10,001V/V, the IN- input is grounded and the signal is supplied to the IN+ input. The non-inverting gain is strongly dependent on any resistance from IN- to GND. For good gain accuracy, a 0Ω resistor should be installed on the empty R5 pad. User-Selectable Options (Figures 3 and 4) Component pads are included to enable a variety of user-selectable circuits to be added to the amplifier inputs, the VREF input, outputs and the amplifier feedback loops. A voltage divider (Figure 3, R18 and R15) can be added to establish a power supply-tracking common mode reference using the VREF input. The inverting and non-inverting inputs have additional resistor placements for adding input attenuation, or to establish input DC offsets through the VREF pin. The output (Figure 4) also has additional resistor and capacitor placements for filtering and loading. NOTE: Operational amplifiers are sensitive to output capacitance and may oscillate. In the event of oscillation, reduce output capacitance by using shorter cables, or add a resistor in series with the output. FIGURE 2. POWER SUPPLY CIRCUIT 2 1µF 1µF 2 3 3 C5 C4 C2 D1 VREF V+ V- 0.01µF 0.01µF C5 CLOSE TO DUT VOUT VIN+ ( VIN-) RF ( • RIN) ⁄ – VREF + = (EQ. 1) IN+A IN-A DNP R4 J2 J1 R1 R2 R14 R18 R15 R13 R11 100 DNP 0 100 DNP 1M OPEN 100k VREF TO INA - TO INA + FROM OUTA FIGURE 3. INPUT STAGE C6 OUT A R26 J12 0 FIGURE 4. OUTPUT STAGE C6 OUT_A TABLE 1. ISL28233MSOPEVAL2Z COMPONENTS PARTS LIST DEVICE # DESCRIPTION COMMENTS C2, C4 CAP, SMD, 1206, 1µF, 50V, 10%, X7R, ROHS Power Supply Decoupling C3, C5 CAP, SMD, 0603, 0.1µF, 50V, 10%, X7R, ROHS Power Supply Decoupling C1, C6, C7, C8, C9, C10 CAP, SMD, 0603, DNP-PLACE HOLDER, ROHS User selectable capacitors - not populated R11, R14, R21, R24 RESISTOR, SMD, 0603, 100Ω, 1%, 1/16W, ROHS Gain Setting Resistor R13, R23 RESISTOR, SMD, 0603, 10MΩ, 1%, 1/16W, ROHS Gain Setting Feedback Resistor R1, R2, R3, R5, R6, R7, R8, R10, R12, R15, R17, R20, R22, R28, R29, R30, R32, R34, R35, R36 RESISTOR, SMD, 0603, DNP-PLACE HOLDER, ROHS User selectable resistors - not populated D1 40V SERIES SCHOTTKY BARRIER DIODE Reverse Power Protection U1 (ISL28233FUZ) ISL28233FUZ, IC-RAIL-TO-RAIL OP AMP, MSOP, ROHS Application Note 1569 |
Podobny numer części - ISL28233MSOPEVAL2Z |
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Podobny opis - ISL28233MSOPEVAL2Z |
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