USER'S MANUAL ISL282X8MSOPEVAL1Z, ISL282X8SOICEVAL1Z AN1419 Rev 0.00 Aug 28, 2008 Evaluation Board Introduction The ISL28238 and ISL28248 high-speed operational amplifiers feature low power consumption, while ISL28258 and ISL28268 operational amplifiers feature ultra-low power consumption. All op amps have rail-to-rail output drive capability and are designed to operate with a single lithium cell or two Ni_Cd batteries. C2 C4 4.7F C3 4.7F C5 0.01F * ISL28248 Data Sheet, FN6337 * ISL28258 Data Sheet, FN6377 * ISL28268 Data Sheet, FN6378 Evaluation Board Key Features The ISL282xEVAL1Z is designed to enable the IC to operate from a single supply, +2.4VDC to +5.5VDC or from split supplies, 1.2VDC to 2.75V. The board is configured for a dual op amp connected for differential input with a closed loop gain of 10. A single external reference voltage (VREF) pin and provisions for a user-selectable voltage divider-filter are included. RF 0.01F D1 ISL282X8 (1/2) 100k IN RIN- VP IN- IN- V+ 10k RIN+ VREF J14 The schematic of 1/2 of the op amp with the components supplied is shown in Figure 2. The circuit implements a differential input amp with a closed loop gain of 10. The circuit can operate from a single supply or from dual supplies. The VREF pin must be connected to ground to External power connections are made through the +V, -V, VREF and Ground connections on the evaluation board. VREF VREF Amplifier Configuration Power Supplies VCM J13 User-selectable SMA edge connectors are also provided for +V and -V. For single supply operation, the -V and Ground pins are tied together to the power supply negative terminal. For split supplies +V and -V terminals connect to their respective power supply terminals. De-coupling capacitors C2 and C4 connect to their respective supplies through R16 and R31 0 resistors. These resistors are 0 but can be changed by the user to provide additional power supply filtering, or to reduce the voltage rate-of-rise to less than 1V/S. Two additional capacitors, C3 and C5 are connected close to the part to filter out high frequency noise. Anti-reverse diode D1 protects the circuit in the case of accidental polarity reversal (see Figure 1). * ISL28238 Data Sheet, FN6336 IN + J12 FIGURE 1. POWER SUPPYLY CIRCUIT Reference Documents IN+ V+ 0 J11 J8 0 R16 V- R31 J6 The ISL282X8MSOPEVAL1Z and ISL282X8SOICEVAL1Z evaluation board are design platforms containing all the circuitry needed to characterize critical performance parameters of the ISL282X8 operational amplifiers in both MSOP-8 and SOIC-8 packages, using a variety of user defined test circuits. IN+ + 0 VOUT VVM 10k REF+ RL 100k 10k GND FIGURE 2. BASIC AMPLIFIER CONFIGURATION AN1419 Rev 0.00 Aug 28, 2008 Page 1 of 5 ISL282X8MSOPEVAL1Z, ISL282X8SOICEVAL1Z jumper placements for loading and/or measurement of frequency sensitive parameters. establish a ground referenced input for dual supply operation, or can be externally set to any reference level for single supply operation. VREF should not be left floating. The outputs (see Figure 4) have a 10k load resistor to ground and have additional resistor and capacitor placements for loading. User-selectable Options Component pads are included to enable a variety of user-selectable circuits to be added to the amplifier VREF, inputs, outputs, and the amplifier feedback loops. The Inputs (see Figure 3) have additional resistor and capacitor, and R5 R13 100k C1 OPEN R14 VREF 10k DNP R15 R18 DNP 100k DNP J20 J19 R11 10k R17 DNP R12 DNP TO OUTPUT TO INTO IN+ C6 FROM OUTPUT OPEN R26 0 10k R2 R10 DNP OPEN R28 J2 R3 DNP DNP 0 OUT C8 R1 DNP R6 R4 J1 NODE J18 IN+ J17 IN- 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 4. OUTPUT STAGE FIGURE 3. INPUT STAGE TABLE 1. ISL282X8EVAL1Z COMPONENTS PARTS LIST DEVICE # DESCRIPTION COMMENTS C2, C4 CAP-TANTALUM, SMD, D, 4.7F, 50V, 10% LOW ESR, ROHS Power Supply Decoupling C3, C5 CAP, SMD, 0603,1F, 25V,10%, X7R, ROHS Power Supply Decoupling C1, C6 to C10 CAP, SMD, 0603, DNP-Place Holder, ROHS User-Selectable Capacitors - Not Populated D1 Diode-Schottky Barrier, SMD, SOT-23, 3P, 40V, ROHS Reverse Power Protection U1 (ISL28238FUZ) IC-5 MHz RRIO OP AMP, 8P, MSOP, ROHS U1 (ISL28238FBZ) IC-5 MHz RRIO OP AMP, 8P, SOIC, ROHS U1 (ISL28248FUZ) IC-5 MHz RRIO OP AMP, 8P, MSOP, ROHS U1 (ISL28248FBZ) IC-5 MHz RRIO OP AMP, 8P, SOIC, ROHS U1 (ISL28258FUZ) IC-39A RRIO OP AMP, 8P, MSOP, ROHS U1 (ISL28258FBZ) IC-39A RRIO OP AMP, 8P, SOIC, ROHS U1 (ISL28268FUZ) IC-39A RRIO OP AMP, 8P, MSOP, ROHS U1 (ISL28268FBZ) IC-39A RRIO OP AMP, 8P, SOIC, ROHS R30, R32, R34 to R36 RES, SMD, 0603, 0.1%, MF, DNP-PLACE HOLDER User-Selectable Resistors - Not Populated R4, R16, R25 to R27, R31 RES, SMD, 0603, 0, 1/10W, TF, ROHS 0 User-Selectable Resistors R11, R14, R21, R24, R28, R29 RES, SMD, 0603, 10k, 1/10W, 1%, TF, ROHS Gain and Other User-Selectable Resistors R13, R18, R19, R23 Gain Resistors AN1419 Rev 0.00 Aug 28, 2008 RES, SMD, 0603, 100k, 1/10W, 1%, TF, ROHS Page 2 of 5 ISL282X8MSOPEVAL1Z, ISL282X8SOICEVAL1Z ISL282X8EVAL1Z Top View (SOIC Shown) AN1419 Rev 0.00 Aug 28, 2008 Page 3 of 5 AN1419 Rev 0.00 Aug 28, 2008 R8 R5 DNP DNP R6 J4 DNP DNP 100k 100k DNP C7 OPEN R27 0 OPEN VREF 0 10k 10k OPEN R7 DNP OPEN DNP R24 0 OPEN R26 R29 DNP C9 DNP R17 8 1 8 U1 7 2 7 SOIC 8 6 6 3 MSOP 8 5 5 4 R30 1 OPEN 2 3 10k 4 R23 100k C10 R34 DNP IN- C6 R28 DNP C8 J3 J17 DNP R25 DNP J18 R35 R2 J20 R13 100k 2 1 R11 10k DNP R32 DNP J21 DNP J22 DNP OUT NODE IN+ 0.01F J23 R4 0 R16 D1 3 0.01F R31 NODE OUT 0 C4 J13 J24 DNP R1 IN+ J6 4.7F C5 VREF J14 J2 J1 IN- J8 C2 J11 4.7F C3 V+ J12 0 V- J16 J15 ISL282X8MSOPEVAL1Z, ISL282X8SOICEVAL1Z ISL282X8EVAL1Z Schematic Diagram DNP R20 R36 J19 DNP R3 Page 4 of 5 Notice 1. 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