USER S MANUAL Evaluation Board User Guide AN9 Rev. Introduction The evaluation board is a design platform containing all the circuitry needed to characterize critical performance parameters of the ISL87 quad instrumentation amplifier using a variety of user defined test circuits. The ISL8xx 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 +VDC (±.VDC) down to +.VDC (±.VDC). 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 C and C, connect to GND through R and R, resistors. Resistors R and R are but can be changed by the user to provide additional power supply filtering, or to reduce the voltage rate-of-rise to less than ±V/µs. Anti-reverse diodes D and D protect the circuit in the case of accidental polarity reversal. J J V- V+ J Reference Documents ISL876 Data Sheet, FN6 C D R R C D ISL878 Data Sheet, FN69 ISL886 Data Sheet, FN6 ISL888 Data Sheet, FN69 Evaluation Board Key Features C R7 C.UF FIGURE. POWER SUPPLY CIRCUIT R8 The is designed to enable the IC to operate from a single supply (+.VDC to +VDC), or from split supplies (±.VDC to ±/V). The board is configured for independent op amps connected for differential input with a closed loop gain of. A single external reference voltage (VREF) pin and provisions for a user-selectable voltage divider (filter is included). Power Supplies (Figure ) External power connections are made through the V +, V - and GND connections on the evaluation board. For single Amplifier Configuration (Figure ) The schematic of each of the op amps with the components supplied is shown in Figure. The circuit implements a differential input-amp with a closed loop gain of. The circuit can operate from a single.vdc to +VDC supply, or from dual supplies from ±.VDC to ±.VDC. 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. RF / ISL8xx VCM IN+ IN(A,B,C,D)+ VREF IN+ IN(A,B,C,D)- R k RIN+ k + - + RREF(A,B,C,D)+ k k V+ V- TO OTHER CHANNELS k V(x) VREF GND k FIGURE. BASIC AMPLIFIER CONFIGURATION AN9 Rev. Page of
User-selectable Options (Figure ) 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.. J R R REF RREF K C R A K C6 R8 IN(A,B,C,D)- J R R6 R R IN(A,B,C,D)+ J6 R K C7 R K R R FIGURE. COMPONENT-SELECTABLE OPTIONS Components Parts List DEVICE NUMBER DESCRIPTION COMMENTS C, C, C CAP-TANTALUM, SMD, D,.7µF, V, % LOW ESR, ROHS Power Supply Decoupling C, C CAP, SMD, 6,.µF, V, %, X7R, ROHS Power Supply Decoupling C6-C CAP, SMD, 6, -PLACE HOLDER, ROHS User selectable capacitors - not populated D, D DIODE-RECTIFIER, SMD, SOD-, P, V,.A, ROHS Reverse Power Protection U (ISL876EVALZ) U (ISL878EVALZ) U (ISL886EVALZ) U (ISL888EVALZ) R-R, R-R, R-R, R, R6, R8, R, R, R, R8, R, R, R6, R-R8, R9-R6 R6, R8, R, R, R7, R9, R6, R, R-R, R6-R66 R, R7, R9, R, R6, R8, R, R, R, R67-R7 R, R7, R9, R9, R, R7, R9, R ISL876FAZ, IC-RAIL-TO-RAIL PRECISION OP AMP, 6P, QSOP, ROHS ISL878FAZ, IC-RAIL-TO-RAIL PRECISION OP AMP, 6P, QSOP, ROHS ISL886FAZ, IC-RAIL-TO-RAIL PRECISION OP AMP, 6P, QSOP, ROHS ISL888FAZ, IC-RAIL-TO-RAIL PRECISION OP AMP, 6P, QSOP, ROHS RESISTOR, SMD, 6,.%, MF, -PLACE HOLDER RES, SMD, 6,, /6W,TF, ROHS RES, SMD, 6, k, /W, %, TF, ROHS RES, SMD, 6, k, /W, %, TF, ROHS User selectable resistors - not populated user selectable resistors RG gain resistors RF gain resistors R, R, R7, R, R8 RES, SMD, 8,, /8W, TF, ROHS user selectable resistors AN9 Rev. Page of
ISL8xxEVALZ Top View AN9 Rev. Page of
ISL8XXEVALZ Schematic Diagram A IN+ B IN+ C IN+ R R R A RREF CLOSE TO PART CLOSE TO PART C.UF C R6 R7 R7 R7 B R K C D R9 R9 J R IN+ K K K C R9 C IN+C R K IN+D R7 R69 R68 R67 K K K K R6 K C8 IN+B R8 K R C C C C R R R9 D D J R6 R R6 J R R R8 R C C C R R9 R R R66 J6 C R8 R6 C8 R9 R R6 J R6 C9 R7 R6 J9 J R R J7 J8 C R7 K C9 R8 R R R R 6 7 8 U QSOP6 9 6 R R6 J R C R J C7 C6 R6 R6 R6 R K C6 R8 R R R R J K C7 R8 J J6 R C J C R R7 J C B D D IN+D IN+C C C R.UF K K A A R D K K K K K REF V- V+ IN+B B 6 7 8 Generic Pack. 6 9 AN9 Rev. Page of
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