USER S MANUAL ISL7444SEHEVAL1Z Evaluation Board Introduction The ISL7444SEHEVAL1Z evaluation platform is designed to evaluate the ISL7444SEH. The ISL7444SEH contains four high speed and low power op amps designed to take advantage of its full dynamic input and output voltage range with rail-to-rail operation. By offering low power, low offset voltage, and low temperature drift coupled with its high bandwidth and enhanced slew rates upwards of 5V/µs, these op amps make it ideal for applications requiring both high DC accuracy and AC performance. This amplifier is designed to operate over a single supply range of 2.7V to 4V or a split supply voltage range of ±1.35V to ±2V. The ISL7444SEH is manufactured in Intersil s PR4, silicon on insulator, BiCMOS process. This process assures the device is immune to a single event latch-up and provides excellent radiation tolerance. This makes it the ideal choice for high reliability applications in harsh radiation-prone environments. Reference Documents ISL7444SEH Data Sheet FN8411 ISL7444SEH SMD 5962-13214 ISL7444SEH Radiation Test Report Evaluation Board Key Features Single or dual supply operation: ±1.35V to ±2V or 2.7V to 4V Singled-ended or differential input operation with gain (G = 1V/V) External VREF input Banana Jack connectors for power supply and VREF inputs BNC connectors for op amp input and output terminals Convenient PCB pads for op amp input/output impedance loading Power Supply Connections R37 Ω C4.1µF J3 V- C2 D2 R44 C26 1µF Ω Ω 1µF AN1824 Rev. February 25, 213 Figure 1 demonstrates the power supply connections, decoupling and protection circuitry. External power connections are made through the V+, V-, VREF, and GND banana jack connections on the evaluation board. De-coupling capacitors C2 and C26 provide low-frequency power-supply filtering, while additional capacitors (C1, C3, C4 and C5, connected close to the part) filter out high frequency noise, and are connected to their respective supplies through R37 and R48 resistors. These resistors are Ω but can be changed by the user to provide additional power supply filtering, or to reduce the supply voltage rate-of-rise time. Anti-reverse diodes D1 and D2 protect the circuit in case of momentarily reversing the power supplies accidentally to the evaluation board. The VREF pin can be connected to ground to establish a ground referenced input for split supply operation. D1 V+ J1 R48 Ω V- V+ R1 V- AND V+ IC SUPPLY PINS C1.1µF C5.1µF FIGURE 1. POWER SUPPLY CIRCUIT C3.1µF J4 VREF GND J2 R39, R47, R49, R5 VCM IN+ IN+ VREF R14, R16, R18, R4 1kΩ R5, R7, R9, R35 1kΩ A 1kΩ B 6 2 C V+ D 13 9 4 - IN+A IN+B 5 3 IN+C IN+D 12 1 R32 1kΩ + ISL7444SEH 11 V- Ω _A 1 R51 TO R54 _B 7 _C 8 _D 14 R67 TO R7 VREF GND R33 FIGURE 2. BASIC DIFFERENTIAL AMPLIFIER CONFIGURATION AN1824 Rev. Page 1 of 9 February 25, 213
ISL7444SEHEVAL1Z Amplifier Configuration A simplified schematic of the evaluation board is shown in Figure 2. The input stage with the components supplied is shown in Figure 3. The circuit implements a Hi-Z differential input with unbalanced common mode impedance. The differential amplifier gain is expressed in Equation 1: V = V IN+ V R F R IN + V (EQ. 1) REF A R2 R6 Ω R11 C6 R14 1kΩ R2 C23 R39 1kΩ FROM _A TO A For a single-ended input with an inverting gain G = -1V/V, the IN+ input is grounded and the signal is supplied to the input. VREF must be connected to a reference voltage between the V+ and V- supply rails. For a non-inverting operation with G = 11V/V, the negative input () is grounded and the signal is supplied to the positive input (IN+). The non-inverting gain is strongly dependent on any resistance from to GND. For good gain accuracy, a Ω resistor should be installed on the empty R11 pad. IN+A R5 1kΩ C7 R15 Ω R21 FIGURE 3. INPUT STAGE TO IN+A User-selectable Options 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 C14 R51 Ω C15 R55 R59 R63 Ω R67 J13 A A voltage divider 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 and capacitor placements for adding input attenuation or feedback capacitors (Figure 3). FIGURE 4. PUT STAGE The outputs (Figure 4) also have 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. AN1824 Rev. Page 2 of 9 February 25, 213
ISL7444SEHEVAL1Z TABLE 1. ISL7444SEHEVAL1Z COMPONENTS PARTS LIST DEVICE # DESCRIPTION COMMENTS C1, C5 CAP, SMD, 85,.1µF, 5V, 1%, X7R, ROHS Power Supply Decoupling C2, C26 CAP, SMD, 121, 1µF, 5V, 1%, X7R, ROHS Power Supply Decoupling C3, C4 CAP, SMD, 85,.1µF, 25V, 1%, X7R, ROHS Power Supply Decoupling C6 - C25 CAP, SMD, 63, Open-Place Holder, ROHS User Selectable Capacitors - Not Populated D1, D2 4V Schottky Barrier Diode Reverse Power Protection J1 - J4 Johnson Components Standard Type Banana Jack, 18-74-1 Power Supply and Reference Voltage Connector J5 - J16 AMPHENOL BNC Connector, 31-5329-52RFX Connections for Input and Output R32 Resistor, SMD, 63, 1kΩ, 1%, ROHS VREF Resistor Divider R5, R7, R9, R14, R16, R18, R35, R4 Resistor, SMD, 63, 1kΩ, 1%, 1/16W, ROHS Gain Setting Resistor R39, R47, R49, R5 Resistor, SMD, 63, 1kΩ, 1%, 1/16W, ROHS Gain Setting Feedback Resistor R2, R3, R4, R11, R12, R13, R2, R21, R22, R23, R25, R26, R28, R3, R31, R33, R34, R38, R42, R43, R46, R55, R56, R57, R58, R59, R6, R61, R62, R62, R67, R68, R69, R7 U1 Resistor, SMD, 63, -Place Holder, ROHS ISL7444SEH, 4V Radiation Hardened, Low Noise Quad Operational Amplifier User Selectable Resistors - Not Populated V IN V IN : 25mV P-P C1: 1mV/DIV C2: 1mV/DIV T: 1µs/DIV C L = 2pF V IN V IN : 1V P-P C1: 5V/DIV C2: 5V/DIV T: 1µs/DIV C L = 2pF V V FIGURE 5. SMALL SIGNAL STEP RESPONSE (±18V) FIGURE 6. LARGE SIGNAL STEP RESPONSE (±18V) AN1824 Rev. Page 3 of 9 February 25, 213
ISL7444SEHEVAL1Z V IN V IN : 25mV P-P C1: 1mV/DIV C2: 1mV/DIV T: 1µs/DIV C L = 2pF V IN V IN : 2.5V P-P C1: 1.26V/DIV C2: 1.26V/DIV T: 1µs/DIV CL = 2pF V V FIGURE 7. SMALL SIGNAL STEP RESPONSE (±2.5V) FIGURE 8. LARGE SIGNAL STEP RESPONSE (±2.5V) 1 12pF 1 12pF GAIN (db) -1-2 -3-4 ACL = 1 R L = 1k V S = ±18V 27pF 68pF 47pF -5 1 1k 1k 1k 1M 1M 1M FREQUENCY (Hz) FIGURE 9. (V S = ±18V) UNITY GAIN RESPONSE vs CL GAIN (db) -1-2 -3-4 ACL = 1 R L = 1k V S = ±2.5V 27pF 68pF 47pF -5 1 1k 1k 1k 1M 1M 1M FREQUENCY (Hz) FIGURE 1. (V S = ±2.5V) UNITY GAIN RESPONSE vs CL 1 GAIN (db) -1-2 -3 27pF 68pF 12pF -4 ACL = 1 R L = 1k V S = ±1.5V -5 1 1k 1k 1k 1M 1M 1M FREQUENCY (Hz) 47pF FIGURE 11. (V S = ±1.5V) UNITY GAIN RESPONSE vs CL AN1824 Rev. Page 4 of 9 February 25, 213
ISL7444SEHEVAL1Z ISL7444SEHEVAL1Z Layout FIGURE 12. TOP VIEW AN1824 Rev. Page 5 of 9 February 25, 213
ISL7444SEHEVAL1Z ISL7444SEHEVAL1Z Layout (Continued) FIGURE 13. TOP LAYER AN1824 Rev. Page 6 of 9 February 25, 213
ISL7444SEHEVAL1Z ISL7444SEHEVAL1Z Layout (Continued) FIGURE 14. BOTTOM LAYER AN1824 Rev. Page 7 of 9 February 25, 213
AN1824 Rev. Page 8 of 9 February 25, 213 ISL7444SEHEVAL1Z ISL7444SEHEVAL1Z Schematic Diagram RREFA- RINA2- RINA1+ RGA+ RREF A RINA1+ RINA+ RREFA+ RGA+ RINA+ RGA+ B C IN1+ CLOSE TO PART RINA+ CLOSE TO PART RINA1+ RREFA+ RREFA- RINA- RINA1+ IN1+ RGA+ RINA2- RINA+ RINA2- RINA- RREFA+ IN1+ D IN1+ RINA- RREFA- RINA- RREFA- RREFA+ 12 IN+C C R16 C13 R31 1K 2 R52 1K A B B 1K IN+A IN+B IN+C D IN+D IN+B IN+A A IN+D D D J11 R42.1UF 1K C14 R55 R67 R63 J14 R49 1K C5 C22 J4 1 C17 R32 R2 1 1K R5 C6 R56 R21 R38 R45 J6 R1 C11 1K R9 R25 R7 1K R15 R57 C2 C16 J13 R7 R69 R68 J15 J16 J1 J9 J8 1UF 1K VP C1.1UF.1UF 1K C4 R44 R1 C3 R48 2 R64 R17 R23 R13 R19 R4 R26 R65 R53 R66 R58 R54 R41 1 R43 C25 C2 C26 R12 C24 1UF J3 J2 J1 R51 R24 R27 R29 R28 R59 C15 R6 C19 R61 C21 R14 R39 C23 R36 R34 R62.1UF VM VP 13 1 11 9 8 6 7 5 14 4 3 2 1 U1 VM R37 C7 D1 J5 R47 R3 C8 R8 R3 J7 C A R2 R6 R33 R5 C18 D2 B R11 C9 C1 R46 C 1K R18 C12 1K R4 J12 R22 2 R35 1K V- REF1 V- +IN1 +IN2 -IN2 1 -IN4 -IN3 +IN4 +IN3 V+ 2 4 3 -IN1 V+ IN IN ISL7444SEH
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