Application Note 1547 ISL28414TSSOPEVAL1Z Evaluation Board User’s Guide Introduction µ Reference Documents J1 R48 100kΩ V+ IN- V+ IN+ 0Ω VOUT(x) V+ 10kΩ 0Ω (Figure 2) 1/4 ISL28414 V10kΩ RREF(A, B, C, D)+ VREF VP 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 (+1.8VDC to +5.5VDC supply, or from dual supplies from ±0.9VDC to ±2.75V. 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. 10kΩ VCM 2 µ 0.1UF Amplifier Configuration + IN(A, B, C, D)+ C3 1 VM RF IN+ D1 FIGURE 1. POWER SUPPLY CIRCUIT (Figure 1) RIN+ 1 µ 4.7UF 1 1 µ 0.1UF External power connections are made through the +V, -V and Ground connections on the evaluation board. For single supply operation, the -V and Ground pins are tied IN- 0 2 C1 2 0 R37 2 The ISL28414TSSOPEVAL1Z is designed to enable the IC to operate from a single supply (+1.8VDC to +5.5VDC), or from split supplies (±0.9VDC to ±2.75V). 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. Additional user selectable component placements are included to enable the user to configure and test a large variety of amplifier circuits. RIN- 0 1 R1 C4 Evaluation Board Key Features IN(A, B, C, D)- D2 2 • ISL28414 Data Sheet, FN6800 Power Supplies R44 1 1 2 0 C2 1 V- 1 The ISL28414 amplifiers feature low input bias current, low power consumption, and rail-to-rail input and 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 ISL28414TSSOPEVAL1Z evaluation board is a design platform containing all the circuitry needed to characterize critical performance parameters of the ISL28414 quad, CMOS rail-to-rail input and output operational amplifiers, using a variety of user defined test circuits. J2 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, C2, connect to ground through R1, R44, zero ohm resistors. Resistors R37 and R48 are 0Ω but can be changed by the user to provide additional power supply filtering. Anti-reverse diodes D1 and D2 protect the circuit in the case of accidental polarity reversal. 100kΩ 0Ω TO OTHER CHANNELS VREF GND 10kΩ FIGURE 2. BASIC AMPLIFIER CONFIGURATION March 4, 2010 AN1547.0 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-352-6832 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2010. All Rights Reserved All other trademarks mentioned are the property of their respective owners. Application Note 1547 J4 (Figure 3) REF1 RREF C5 2 R33 4.7UF 1 0 R32 1 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. 10K R14 IN(A,B,C,D)R6 R28 2 DNP DNP RINA2- RINA1+ RREFA+ R24 R5 1 2 10K 4 3 5 C6 OPEN R11 R2 DNP 4 3 IN(A,B,C,D)+ J6 1 0 1 C7 IN-A RREFA- R20 1 2 5 DNP J5 RINA- 10K 100K RINA+ R15 2 IN+A 0 R21 OPEN DNP User-Selectable Options RGA+ FIGURE 3. COMPONENT-SELECTABLE OPTIONS ISL28414TSSOPEVAL1Z Components Parts List DEVICE # DESCRIPTION C1, C2, C5 C3, C4 C6, C7, C8, C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24, C25 D1, D2 COMMENTS CAP-TANTALUM, SMD, D, 4.7µF, 50V, 10%. LOW ESR, ROHS Power Supply Decoupling CAP, SMD, 0603, 0.1µF, 25V, 10%, X7R, ROHS Power Supply Decoupling CAP, SMD, 0603, DNP-PLACE HOLDER, ROHS User selectable capacitors - not populated DIODE-RECTIFIER, SMD, SOD-123, 2P, 40V, 0.5A, ROHS Reverse Power Protection U1 ISL28414FVZ, IC-RRIO OP AMP, 16P, TSSOP, ROHS RESISTOR, SMD, 0603, 0.1%, MF, DNP-PLACE HOLDER R2, R3, R4, R11, R12, R13, R20, R21, R22, R23, R25, R26, R28, R30, R31, R34, R38, R42, R43, R46, R55, R56, R57, R58, R59, R60, R61, R62 R6, R8, R10, R15, R17, R19, RES, SMD, 0603, 0Ω, 1/16W, TF, ROHS R36, R41, R51, R52, R53, R54, R63, R64, R65, R66 R5, R7, R9, R14, R16, R18, R33, R35, R40, R67, R68, R69, R70 R24, R27, R29, R39, R45, R47, R49, R50 R1, R32, R37, R44, R48 2 User selectable resistors - not populated Zero ohm user selectable resistors RES, SMD, 0603, 10k, 1/10W, 1%, TF, ROHS RG gain resistors RES, SMD, 0603, 100k, 1/10W, 1%, TF, ROHS RF gain resistors RES, SMD, 0805, 0Ω, 1/8W, TF, ROHS Zero ohm user selectable resistors AN1547.0 March 4, 2010 Application Note 1547 ISL28414TSSOPEVAL1Z Top View Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that the Application Note or Technical Brief is current before proceeding. For information regarding Intersil Corporation and its products, see www.intersil.com 3 AN1547.0 March 4, 2010 0.1UF RINA2- 1 R46 0 IN+C 1 R35 10K C13 OPEN RGA+ R45 2 100K RINA+ 2 R41 0 IN+D DNP R19 1 2 R43 AN1547.0 March 4, 2010 OPEN RINA+ 2 1 5 100K RREFA+ RINA1+ IN1+J12 4 10K C11 RREFA+ R29 2 DNP 3 4 1 R9 R26 1 3 RINA1+ 1 2 1 4 3 R68 1 DNP 2 C17 OUT 4 3 2 5 10K J15 1 R69 2 DNP DNP R61 R57 1 1 RGA+ 5 4 J16 3 1 2 10K 2 1 R70 2 R62 1 DNP 1 2 1 2 OPEN 0 2 C20 IN-D RREFA- D 5 1 2 2 2 0 R66 0 OPEN R36 R54 2 1 2 2 DNP 1 5 DNP IN-J11 R38 1 DNP DNP R31 3 2 4 2 OPEN 10K C12 R42 R40 1 RREFA- C IN1+J10 2 1 RINAIN-C R34 RINA2- 1 OPEN 2 2 C18 C25 R50 DNP R4 DNP 3 4 2 0 0 RGA+ 2 R25 R10 1 2 DNP 1 5 R13 IN- J9 0 OPEN IN+B R18 RINA10K C10 R65 C19 9 OUT OPEN 10 OUTC 8 100K 1 R53 OPEN 0 7 1 R17 OPEN 11 IN-C 6 100K RINA+ 2 DNP 3 10K C9 1 R23 2 4 5 R27 2 1 12 IN+C 100K - 1 5 + R7 IN1+ J8 R49 13 VM - RREFA+ RINA1+ 14 IN+D + B 3 4 OPEN 1 DNP 5 2 1 2 DNP 2 OPEN R22 RINA2- DNP R12 R3 DNP 3 4 1 - 0 J14 OUT Application Note 1547 2 1 15 IN-D + 2 C24 2 - 1 5 R30 1 OPEN + IN- R8 J7 16 OUTD 1 1 2 1 1 1 DNP R60 OPEN 2 0 10K R64 0 R56 2 R16 RINA- OUTA IN-A IN+A VP IN+B IN-B OUTB 4 2 2 1 1 C15 OPEN 0 R52 2 C22 100K IN-B RREFA- OUT VP R47 2 5 2 1 10K C8 J13 2 2 C16 C23 OPEN R39 RGA+ C3 1 VM R48 0 CLOSE TO PART 100K 1 DNP R55 DNP R59 1 1 2 3 0 10K R63 0 2 C14 1 4.7UF D1 R51 R67 J1 0 2 1 1 OPEN 4.7UF C5 0 D2 C1 2 CLOSE TO PART 1 0.1UF IN+A 0 OPEN 2 1 R15 2 C4 100K RINA+ 1 10K 1 10K C7 R1 1 2 2 2 DNP 2 R24 R21 5 1 3 1 4 4 IN1+ R5 R33 RREFA+ RINA1+ V+ OPEN RREF R44 1 4.7UF 0 1 DNP A J6 J2 1 R28 2 R37 RINA2- OPEN R32 2 1 C2 2 1 1 RREFADNP 0 DNP DNP 3 R2 4 2 1 2 10K C6 R11 1 5 V- IN-A 2 R20 R6 IN- J5 REF1 R14 RINA- 1 J3 J4 ISL28414TSSOPEVAL1Z Schematic Diagram