J14 J13 J12 J11 J8 J6 USERS MANUAL ISL28213/14SOICEVAL2Z AN1519 Rev 0.00 Evaluation Board January 19, 2010 Introduction V- V+ VREF The ISL28213/14SOICEVAL2Z evaluation board is a design platform containing all the circuitry needed to characterize critical performance parameters of the ISL28213 and ISL28214 operational amplifiers, using a variety of user defined test circuits. C2 C4 The ISL28213 and ISL28214 CMOS operational 1 F 1 F amplifiers feature low power consumption, low input bias current, and rail-to-rail input and output drive D1 capability. They are designed to operate with a single CLOSE T O DUT lithium cell or two Ni Cd batteries. C3 C5 0. 01F 0.01F Reference Documents FIGURE 1. POWER SUPPLY CIRCUIT ISL28213/14SOICEVAL2Z Evaluation Board Users Guide connect to their respective power supply terminals. De- coupling capacitors C2 and C4 connect to their ISL28213 Data Sheet, FN6728 respective supplies through R16 and R31 0 resistors. ISL28214 Data Sheet, FN6800 These resistors are 0 but can be changed by the user to provide additional power supply filtering. Two Evaluation Board Key Features additional capacitors, C3 and C5, are connected close The ISL28213/14SOICEVAL2Z is designed to enable to the DUT to filter out high frequency noise. Anti- the IC to operate from a single supply, +2.4VDC to reverse diode D1 protects the circuit in the case of +5.5VDC or from split supplies, 1.2VDC to 2.75V. accidental polarity reversal. The board is configured for a dual op amp connected for differential input with a closed loop gain of 10. A Amplifier Configuration single external reference voltage (VREF) pin and (Figure 2) provisions for a user-selectable voltage divider - filter The schematic of 1/2 of the op-amp with the are included. components supplied is shown in Figure 2. The circuit implements a differential input amp with a closed loop Power Supplies (Figure 1) gain of 10. The circuit can operate from a single supply External power connections are made through the +V, or from dual supplies. The VREF pin must be connected -V, VREF and Ground connections on the evaluation to ground to establish a ground referenced input for board. For single supply operation, the -V and Ground dual supply operation, or can be externally set to any pins are tied together to the power supply negative reference level for single supply operation. VREF terminal. For split supplies, +V and -V terminals should not be left floating. RF ISL28213, ISL28214 (1/2) 100k IN - VP RIN- IN- - IN- 0 V+ 10k VOUT V- RIN+ IN+ + IN+ VM 10k IN + RL VCM RREF+ VREF 100k 10k 0 10k VREF GND FIGURE 2. BASIC AMPLIFIER CONFIGURATION AN1519 Rev 0.00 Page 1 of 5 January 19, 2010 R16 0 R31 0ISL28213/14SOICEVAL2Z The outputs (Figure 4) have a 10k load resistor to User-selectable Options ground and have additional resistor and capacitor (Figures 3 and 4) placements for loading. Component pads are included to enable a variety of user- NOTE: Operational amplifiers are sensitive to output selectable circuits to be added to the amplifier VREF, capacitance and may oscillate. In the event of oscillation, inputs, outputs, and the amplifier feedback loops. The reduce output capacitance by using shorter cables, or inputs (Figure 3) have additional resistor, capacitor, and add a resistor in series with the output. jumper placements for loading and/or measurement of frequency sensitive parameters. IN- IN+ NODE OUT R10 R12 FROM OUTPUT C6 DNP DNP OPEN R4 R11 R13 R26 J1 R1 0 10k 100k 0 C1 DNP TO OUTPUT OPEN TO IN- R14 J2 TO IN+ R2 10k VREF DNP R15 R18 DNP 100k FIGURE 4. OUTPUT STAGE (1/2) FIGURE 3. INPUT STAGE (1/2) ISL28213/14SOICEVAL2Z Components Parts List DEVICE DESCRIPTION COMMENTS C2, C4 CAP-TANTALUM, SMD, 1.0F, 50V, 10%, LOW ESR, ROHS Power Supply Decoupling C3, C5 CAP, SMD, 0603, 0.1F, 25V, 10%, X7R, ROHS Power Supply Decoupling C1, C6-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 (ISL28213FBZ) ISL28213FBZ-T7, IC-RAIL-TO-RAIL OP AMP, SOIC, ROHS U1 (ISL28214FBZ) ISL28214FBZ-T7, IC-RAIL-TO-RAIL OP AMP, SOIC, ROHS R30, R32, R34-R36 RESISTOR, SMD, 0603, 0.1%, MF, DNP-PLACE HOLDER User Selectable Resistors - not populated R4, R16, R25-R27, R31 RES, SMD, 0603, 0, 1/10W, TF, ROHS 0 User Selectable Resistors R11, R14, R21, R24, R28, RES, SMD, 0603, 10k, 1/10W, 1%, TF, ROHS Gain and Other User Selectable R29 Resistors R13, R18, R19, R23 RES, SMD, 0603, 100k, 1/10W, 1%, TF, ROHS Gain Resistors AN1519 Rev 0.00 Page 2 of 5 January 19, 2010 R3 DNP R5 R6 DNP DNP R17 DNP C8 OPEN R28 10k