USER'S MANUAL ISL284xxEVAL1Z AN1339 Rev 0.00 July 23, 2007 Evaluation Board User Guide 2 R37 * ISL28478 Data Sheet, FN6339 * ISL28486 Data Sheet, FN6312 2 C4 0 1 J1 0 2 C3 1 VM Evaluation Board Key Features The schematic of each of the 4 op amps 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 2.4VDC to +5VDC supply, or from dual supplies from 1.2VDC to 2.5VDC. The VREF pin can be connected to ground to establish a ground referenced input for split supply operation, or can be externally set to any reference level for single supply operation. External power connections are made through the V+, Vand GND connections on the evaluation board. For single RF + IN(A,B,C,D)RIN- IN- INRIN+ 1/4 ISL284xx 100k VP - 0 V+ 10k IN+ + 10k RREF(A,B,C,D)+ VREF VREF GND 0 VOUT(x) VVM 10k VCM VP Amplifier Configuration (Figure 2) Power Supplies (Figure 1) IN(A,B,C,D)+ 2 0.1UF FIGURE 1. POWER SUPPLY CIRCUIT The ISL284xxEVAL1Z is designed to enable the IC to operate from a single supply (+2.4VDC to +5VDC), or from split supplies (1.2VDC to 2/5V). The board is configured for 4 independent op amps 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 is included). IN+ 1 4.7UF 1 D1 1 * ISL28488 Data Sheet, FN6339 C1 2 0 * ISL28476 Data Sheet, FN6301 D2 R1 R48 4.7UF 2 R44 1 1 C2 1 Reference Documents V+ 0 V- 1 The ISL284xx are quad operational amplifiers featuring low noise, low distortion, and rail-to-rail output drive capability. They are designed to operate with single and dual supplies from +5VDC (2.5VDC) down to +2.4VDC (1.2VDC). J3 The ISL284xxEVAL1Z evaluation board is a design platform containing all the circuitry needed to characterize critical performance parameters of the ISL28470 quad instrumentation amplifier using a variety of user defined test circuits. J2 supply operation, the V- and GND 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 C1 and C2, connect to GND through R1 and R2, 0 resistors. Resistors R3 and R4 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. Anti-reverse diodes D1 and D2 protect the circuit in the case of accidental polarity reversal. Introduction 100k 0 TO OTHER CHANNELS 10k FIGURE 2. BASIC AMPLIFIER CONFIGURATION AN1339 Rev 0.00 July 23, 2007 Page 1 of 5 ISL284xxEVAL1Z User-selectable Options (Figure 3) J4 . Component pads are included to enable a variety of user-selectable circuits to be added to the amplifier inputs, the VREF input, and the amplifier feedback loops. A voltage divider and filter option can be added to establish a power supply-tracking common mode reference at 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. RREF C5 4.7UF 2 R33 10K 1 0 R32 1 REF1 R14 IN(A,B,C,D)R6 R28 2 DNP DNP RINA2- RINA1+ RREFA+ R24 R5 C7 OPEN 100K RINA+ 2 R15 IN+A 0 DNP 4 3 10K 1 R21 1 2 5 C6 OPEN R11 R2 DNP 4 3 IN(A,B,C,D)+ J6 1 0 R20 1 2 5 IN-A RREFA- DNP J5 RINA- 10K RGA+ FIGURE 3. COMPONENT-SELECTABLE OPTIONS ISL284xxEVAL1Z Components Parts List DEVICE NUMBER C1, C2, C5 DESCRIPTION COMMENTS CAP-TANTALUM, SMD, D, 4.7F, 50V, 10% LOW ESR, ROHS Power Supply Decoupling C3, C4 CAP, SMD, 0603, 0.1F, 25V, 10%, X7R, ROHS Power Supply Decoupling C6-C25 CAP, SMD, 0603, DNP-PLACE HOLDER, ROHS User selectable capacitors - not populated D1, D2 DIODE-RECTIFIER, SMD, SOD-123, 2P, 40V, 0.5A, ROHS Reverse Power Protection U1 (ISL28476EVAL1Z) ISL28476FAZ, IC-RAIL-TO-RAIL PRECISION OP AMP, 16P, QSOP, ROHS U1 (ISL28478EVAL1Z) ISL28478FAZ, IC-RAIL-TO-RAIL PRECISION OP AMP, 16P, QSOP, ROHS U1 (ISL28486EVAL1Z) ISL28486FAZ, IC-RAIL-TO-RAIL PRECISION OP AMP, 16P, QSOP, ROHS U1 (ISL28488EVAL1Z) ISL28488FAZ, IC-RAIL-TO-RAIL PRECISION OP AMP, 16P, QSOP, ROHS R2-R4, R11-R13, R20-R23, R25, RESISTOR, SMD, 0603, 0.1%, MF, DNP-PLACE HOLDER R26, R28, R30, R31, R34, R38, R42, R43, R46, R55-R58, R59-R62 User selectable resistors - not populated R6, R8, R10, R15, R17, R19, R36, RES, SMD, 0603, 0, 1/16W,TF, ROHS R41, R51-R54, R63-R66 0 user selectable resistors R5, R7, R9, R14, R16, R18, R33, RES, SMD, 0603, 10k, 1/10W, 1%, TF, ROHS R35, R40, R67-R70 RG gain resistors R24, R27, R29, R39, R45, R47, R49, R50 R1, R32, R37, R44, R48 AN1339 Rev 0.00 July 23, 2007 RES, SMD, 0603, 100k, 1/10W, 1%, TF, ROHS RF gain resistors RES, SMD, 0805, 0, 1/8W, TF, ROHS 0 user selectable resistors Page 2 of 5 ISL284xxEVAL1Z ISL28xxEVAL1Z Top View AN1339 Rev 0.00 July 23, 2007 Page 3 of 5 5 5 IN1+J10 C 5 IN- J9 IN1+ J8 B 5 J7 5 J6 IN- IN1+ A 5 IN- J5 3 4 4 4 3 3 3 2 1 1 R2 2 1 2 1 1 1 2 1 2 1 1 1 2 10K C7 R5 1 10K C9 R7 1 1 1 OPEN 10K C11 R9 2 2 1 1 2 2 1 2 R24 2 0 R19 1 IN+B 1 RGA+ 100K IN+C RREFA+ DNP R31 R29 2 RREFA- IN-C RGA+ 100K R27 RREFA+ DNP R30 IN-B RREFA- 2 RINA+ OPEN 10K C10 IN+A RGA+ 100K 2 1 RREFA+ DNP R28 R18 RINA- 0 R17 RINA+ OPEN 10K C8 IN-A J4 RREF REF1 5 IN1+J12 D 5 IN-J11 R32 R33 1 0 10K RREFA- R16 RINA- 0 R15 1 RINA1+ 2 RINA+ OPEN 2 RINA2- 0 R10 2 2 RINA1+ OPEN 1 2 RINA2- 0 R8 2 2 RINA1+ RINA2- 0 R6 OPEN DNP 1 2 4 4 3 3 4 R3 R4 10K C6 R13 DNP DNP DNP DNP DNP DNP DNP DNP R11 R12 R20 R21 R22 R23 1 C5 2 2 4 4 4.7UF 3 3 1 2 1 2 1 1 2 1 1 OPEN 10K C13 2 2 RINA1+ R35 C2 1 D2 1 0 R44 100K OPEN R39 C23 1 8 7 6 5 4 3 2 1 2 0 R41 J2 DNP R46 IN+D 1 RGA+ 100K R45 RREFA+ 2 D1 2 1 4.7UF C1 15 16 1 9 10 11 12 C3 2 0.1UF 9 10 OUTC 11 IN-C 12 IN+C 13 VM 14 IN+D 15 IN-D 16 OUTD 100K R47 OPEN C22 1 2 CLOSE TO PART 0 2 R1 U1 QSOP16 14 Generic 13 Pack. 1 IN-D RREFA- 8 7 6 5 4 3 2 1 2 2 RINA+ OPEN 10K C12 R40 RINA- OUTA IN-A IN+A VP IN+B IN-B OUTB 1 VM CLOSE TO PART 2 4.7UF 1 2 J3 1 2 RINA2- 0 R36 0.1UF C4 V1 0 VP V+ 1 1 2 100K R50 OPEN C25 100K R49 OPEN C24 2 0 R54 0 R53 0 R52 0 R51 OPEN R14 RINA- DNP 0 R38 R37 DNP DNP R25 R26 R42 DNP DNP DNP DNP R43 J1 1 R48 2 C14 1 2 C16 1 2 C18 1 2 C20 1 OPEN OPEN OPEN R55 1 C15 2 R56 1 C17 2 R57 1 C19 OPEN OPEN OPEN OPEN 2 R58 1 C21 2 2 DNP R59 1 2 DNP R60 1 0 R66 0 R65 0 R64 0 R63 R68 R69 DNP DNP DNP DNP 2 DNP R61 1 2 DNP R62 1 2 R67 1 2 R70 1 2 2 1 10K 2 1 10K 2 1 10K 1 2 1 2 1 3 3 4 3 3 4 4 4 AN1339 Rev 0.00 July 23, 2007 10K 1 5 J16 5 J15 5 J14 5 J13 OUT OUT OUT OUT ISL284xxEVAL1Z ISL284XXEVAL1Z Schematic Diagram Page 4 of 5 R34 Notice 1. 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