USER'S MANUAL ISL2853xEV2Z, ISL2863xEV2Z AN1880 Rev.2.00 Feb 23, 2016 Evaluation Boards User Guide Introduction Input Common Mode Range The ISL2853xEV2Z and ISL2863xEV2Z boards allow simple evaluation of the ISL2853x and ISL2863x 5V zero drift programmable gain instrumentation amplifiers. The boards are designed with all necessary components to easily connect the high performance amplifier to an external signal and can operate from a single supply of +2.5V to +5.5V or dual supply of 1.25V to 2.75V. The ISL2853x and ISL2863x are designed using the 3 op-amp topology that has a first stage differential amplifier (gain) and second stage difference amplifier (common-mode rejection). Since the common-mode voltage is buffered in the first stage and eliminated in the second stage it is important not to saturate the output of the first stage. An input signal with high VCM will have limited gain range before saturation. Refer to ISL2853x, ISL2863x datasheet for more information on VCM vs VOUT limitations of the instrumentation amplifier. The ISL28533, ISL28534, ISL28535 are differential input, single-ended output instrumentation amplifiers. The ISL28633, ISL28634, ISL28635 are differential input, differential output instrumentation amplifiers, suited to drive differential ADCs. The amplifier can be programmed with 9 gain settings over a range of 1V/V to 1,000V/V using only two logic inputs. Refer to the ISL2853x, ISL2863x datasheet for more information on programming the gain of the instrumentation amplifier. VA+ and VA- Pinouts Unique to the ISL2853x and ISL2863x, instrumentation amplifiers are the outputs of the first stage differential amplifier pinned out of the device called VA+ and VA- for the INA+ and INA- inputs respectively. As the common mode voltage is buffered, the VA pins can be used to sense the input VCM. This is important for sensor applications that track the VCM voltage for sensor health monitors. Refer to ISL2853x, ISL2863x datasheet for more information on monitoring the input VCM. Getting Started * Connect power supply to V+ and V- pins. Single supply +2.5V to +5V. Dual supply 1.25V to 2.5V. * Connect voltage to the REF pin for setting the output reference. The board has 1k resistors to V+ and V- to preset the output reference voltage to midscale of supply voltage. * Set gain of instrumentation amplifier by setting the G0 and G1 gain switches into proper state as shown in Table 2. * Connect the differential input voltage to the left side of the eval board. Reference Documents * ISL2853x, ISL2863x datasheet High Precision Amplifier The ISL2853x and ISL2863x family of instrumentation amplifiers offer very low offset, noise and offset drift using zero drift amplifier circuitry. With precision matched internal gain resistors these amplifiers offer high gain accuracy while reducing the need for additional external resistors in applications that need different gain settings. Combined with rail-to-rail input and output, the ISL2853x and ISL2863x instrumentation amplifiers are ideal for single supply low noise, high precision amplification and signal conditioning. * Measure the output voltage of the instrumentation amplifier on the right side of the evaluation board. * (IMPORTANT) For the ISL2853xEV2Z boards, the additional op amp inputs (AMP IN+ and AMP IN-) are floating. If the op amp is not used, for proper operation place a 0 at R22 and terminate AMP IN+ to ground through C14 or TP8. TABLE 1. KEY PERFORMANCE SPECIFICATION VALUE UNITS Input Offset Voltage PARAMETER 5 V Input Offset Drift 50 nV/C 0.05 % Gain Accuracy Gain Drift 10 ppm/C 0.25 VP-P Input Noise Density, f = 1kHz 20 nV/Hz CMRR 120 dB 2 MHz 0.1Hz to 10Hz Noise Peak-to-Peak Gain Bandwidth Product AN1880 Rev.2.00 Feb 23, 2016 Page 1 of 5 ISL2853xEV2Z, ISL2863xEV2Z TABLE 2. PROGRAMMABLE GAIN SWITCHING TABLE 3. ORDERING INFORMATION BOARD PART NUMBER GAIN G1 G0 ISL28533 ISL28633 ISL28534 ISL28634 ISL28535 ISL28635 0 0 1 1 1 0 Z 2 2 100 0 1 4 10 120 Z 0 5 50 150 Z Z 10 100 180 Z 1 20 200 200 1 0 40 300 300 1 Z 50 500 500 1 1 100 1000 1000 ISL28533EV2Z OUTPUT GAIN RANGE Single-ended 1 to 100 ISL28534EV2Z 1 to 1,000 ISL28535EV2Z 1 to 1,000 ISL28633EV2Z Differential 1 to 100 ISL28634EV2Z 1 to 1,000 ISL28635EV2Z 1 to 1,000 ISL2853xEV2Z, ISL2863xEV2Z Evaluation Boards Layout FIGURE 1. TOP LAYER PCB FIGURE 2. BOTTOM LAYER PCB FIGURE 3. ASSEMBLY TOP LAYER FIGURE 4. BOTTOM LAYER SILKSCREEN AN1880 Rev.2.00 Feb 23, 2016 Page 2 of 5 ISL2853xEV2Z, ISL2863xEV2Z ISL2853xEV2Z, ISL2863xEV2Z Schematic C6 C10 4.7F 5 6 7 OPEN C4 C7 0 V- 10nF VA- 13 12 OUTA/OUTA+ INA+ REF INA- OUT/OUTA- VA+ IN- V- IN+ 0 0 V- 10 R23 9 8 C12 10nF R11 R21 DNP 11 R22 DNP C8 0.1F C11 0.1F C15 0 OPEN REF TP12 AMP_OUT INA_OUT TP11 R16 DNP TP18 C14 TP2 1k DNC G1 14 1k V+ OPEN OPEN 0 G0 V+ R19 C1 OPEN 3 4 R3 OPEN P2 2 R7 C2 R1 DNP R5 0 VA+ 0 R6 C3 0 TP3 0 R4 TP1 INA_IN- R10 1 P1 INA_IN+ R2 TP9 C18 V- 0 V+ OPEN U1 ISL2853x ISL2863x 14 LD TSSOP 1k VA- INA_OUT+ R17 R24 G1 OPEN S2 TP6 OPEN R9 GND TP5 OPEN 1k 1k TP4 C16 R8 GO C17 1k C13 S1 R13 0 R14 R12 D2 D1 0 C9 4.7F V+ V- 1F 1F C5 R15 V+ R18 AMP_IN- 0 TP9 R20 AMP_IN+ 0 TP8 FIGURE 5. SCHEMATIC FOR ISL2853x AND ISL2863x EVALUATION BOARDS AN1880 Rev.2.00 Feb 23, 2016 Page 3 of 5 ISL2853xEV2Z, ISL2863xEV2Z TABLE 4. BILL OF MATERIALS PART # ISL28533FVZ ISL28534FVZ ISL28535FVZ ISL28633FVZ ISL28634FVZ ISL28635FVZ REFERENCE DESIGNATOR U1 DESCRIPTION MANUFACTURER Programmable Zero Drift Instrumentation Amplifier Intersil GRM155R71E103KA01 C7, C12 0.01F SMD Capacitor; 10%; 25V Murata H1044-00104-16V10 C8, C11 0.1F SMD Capacitor; 10%; 16V Generic DNP; Placeholder Generic DNP C1-C4, C13-C18 H1045-00105-16V20 C6, C10 1F SMD Capacitor; 20%; 16V Generic H1046-00475-10V20 C5, C9 4.7F SMD Capacitor; 20%; 10V Generic S1A D1, D2 1A SMD Rectifier Diode DIODES-INC H2510-00R00-1/16W R2, R3, R5-R7, R10, R11, R14, R15, R17, R18, R20, R23 0 SMD Resistor; 1%; 1/16W Generic H2510-01001-1/16W1 R8, R9, R12, R13, R19, R24 1k SMD Resistor; 1%; 1/16W Generic DNP; Placeholder Generic 0 SMD Resistor; 1%; 1/10W Generic SEALED SUBMINIATURE TOGGLE SWITCH ITT CANNON - C&K DNP H2512-00R00-1/10W ET03SD1CBE AN1880 Rev.2.00 Feb 23, 2016 R1, R16, R21, R22 R4 S1, S2 Page 4 of 5 Notice 1. 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