USERS MANUAL ISL2853xEV2Z, ISL2863xEV2Z AN1880 Rev.2.00 Evaluation Boards User Guide Feb 23, 2016 Introduction Input Common Mode Range The ISL2853xEV2Z and ISL2863xEV2Z boards allow simple The ISL2853x and ISL2863x are designed using the 3 op-amp evaluation of the ISL2853x and ISL2863x 5V zero drift topology that has a first stage differential amplifier (gain) and programmable gain instrumentation amplifiers. The boards second stage difference amplifier (common-mode rejection). are designed with all necessary components to easily connect Since the common-mode voltage is buffered in the first stage the high performance amplifier to an external signal and can and eliminated in the second stage it is important not to operate from a single supply of +2.5V to +5.5V or dual supply saturate the output of the first stage. An input signal with high of 1.25V to 2.75V. V will have limited gain range before saturation. Refer to CM ISL2853x, ISL2863x datasheet for more information on V CM The ISL28533, ISL28534, ISL28535 are differential input, vs V limitations of the instrumentation amplifier. OUT single-ended output instrumentation amplifiers. The ISL28633, ISL28634, ISL28635 are differential input, VA+ and VA- Pinouts differential output instrumentation amplifiers, suited to drive differential ADCs. The amplifier can be programmed with Unique to the ISL2853x and ISL2863x, instrumentation 9 gain settings over a range of 1V/V to 1,000V/V using only amplifiers are the outputs of the first stage differential two logic inputs. Refer to the ISL2853x, ISL2863x datasheet amplifier pinned out of the device called VA+ and VA- for the for more information on programming the gain of the INA+ and INA- inputs respectively. As the common mode instrumentation amplifier. voltage is buffered, the VA pins can be used to sense the input V . This is important for sensor applications that track the CM V voltage for sensor health monitors. Refer to ISL2853x, CM ISL2863x datasheet for more information on monitoring the input V . CM 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. Measure the output voltage of the instrumentation amplifier on the right side of the evaluation board. Reference Documents (IMPORTANT) For the ISL2853xEV2Z boards, the additional op amp inputs (AMP IN+ and AMP IN-) are floating. If the op ISL2853x, ISL2863x datasheet amp is not used, for proper operation place a 0 at R and 22 terminate AMP IN+ to ground through C or TP8. 14 High Precision Amplifier TABLE 1. KEY PERFORMANCE SPECIFICATION The ISL2853x and ISL2863x family of instrumentation amplifiers offer very low offset, noise and offset drift using PARAMETER VALUE UNITS zero drift amplifier circuitry. With precision matched internal Input Offset Voltage 5 V gain resistors these amplifiers offer high gain accuracy while Input Offset Drift 50 nV/C reducing the need for additional external resistors in applications that need different gain settings. Combined with Gain Accuracy 0.05 % rail-to-rail input and output, the ISL2853x and ISL2863x Gain Drift 10 ppm/C instrumentation amplifiers are ideal for single supply low 0.1Hz to 10Hz Noise Peak-to-Peak 0.25 V noise, high precision amplification and signal conditioning. P-P Input Noise Density, f = 1kHz 20 nV/ Hz CMRR 120 dB Gain Bandwidth Product 2 MHz AN1880 Rev.2.00 Page 1 of 5 Feb 23, 2016ISL2853xEV2Z, ISL2863xEV2Z TABLE 2. PROGRAMMABLE GAIN SWITCHING TABLE 3. ORDERING INFORMATION GAIN BOARD PART NUMBER OUTPUT GAIN RANGE ISL28533 ISL28534 ISL28535 ISL28533EV2Z Single-ended 1 to 100 G1 G0 ISL28633 ISL28634 ISL28635 ISL28534EV2Z 1 to 1,000 0 0 111 ISL28535EV2Z 1 to 1,000 0Z 2 2 100 ISL28633EV2Z Differential 1 to 100 01 4 10 120 ISL28634EV2Z 1 to 1,000 Z 0 5 50 150 ISL28635EV2Z 1 to 1,000 ZZ 10 100 180 Z 1 20 200 200 1 0 40 300 300 1 Z 50 500 500 1 1 100 1000 1000 ISL2853xEV2Z, ISL2863xEV2Z Evaluation Boards Layout FIGURE 2. BOTTOM LAYER PCB FIGURE 1. TOP LAYER PCB FIGURE 3. ASSEMBLY TOP LAYER FIGURE 4. BOTTOM LAYER SILKSCREEN AN1880 Rev.2.00 Page 2 of 5 Feb 23, 2016