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ISL21080CIH315Z-TK Datasheet(PDF) 7 Page - Intersil Corporation |
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ISL21080CIH315Z-TK Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 10 page 7 FN6934.0 July 28, 2009 not in use can remain powered up between conversions as shown in Figure 17. Data acquisition circuits providing 12 bits to 24 bits of accuracy can operate with the reference device continuously biased with no power penalty, providing the highest accuracy and lowest possible long term drift. Other reference devices consuming higher supply currents will need to be disabled in between conversions to conserve battery capacity. Absolute accuracy will suffer as the device is biased and requires time to settle to its final value, or, may not actually settle to a final value as power on time may be short. Table 1 shows an example of battery life in years for ISL21080 in various power on condition with 1.5µA maximum current consumption. ISL21080 Used as a Low Cost Precision Current Source Using an N-JET and a Nanopower voltage reference, ISL21080, a precision, low cost, high impedance current source can be created. The precision of the current source is largely dependent on the tempco and accuracy of the reference. The current setting resistor contributes less than 20% of the error. Board Mounting Considerations For applications requiring the highest accuracy, board mounting location should be reviewed. Placing the device in areas subject to slight twisting can cause degradation of the accuracy of the reference voltage due to die stresses. It is normally best to place the device near the edge of a board, or the shortest side, as the axis of bending is most limited at that location. Obviously, mounting the device on flexprint or extremely thin PC material will likewise cause loss of reference accuracy. Board Assembly Considerations FGA references provide high accuracy and low temperature drift but some PC board assembly precautions are necessary. Normal output voltage shifts of 100µV to 1mV can be expected with Pb-free reflow profiles. Precautions should be taken to avoid excessive heat or extended exposure to high reflow temperatures, which may reduce device initial accuracy. Post-assembly x-ray inspection may also lead to permanent changes in device output voltage and should be minimized or avoided. If x-ray inspection is required, it is advisable to monitor the reference output voltage to verify excessive shift has not occurred. If large amounts of shift are observed, it is best to add a shield of thin zinc (300µm) to allow imaging but block x-rays that affect the FGA reference. Noise Performance and Reduction The output noise voltage in a 0.1Hz to 10Hz bandwidth is typically 30µVP-P. This is shown in the plot in the “Typical Performance Characteristics Curves” which begin on page 4. The noise measurement is made with a bandpass filter made of a 1 pole high-pass filter with a corner frequency at 0.1Hz and a 2-pole low-pass filter with a corner frequency at 12.6Hz to create a filter with a 9.9Hz bandwidth. Noise in the 10kHz to 1MHz bandwidth is approximately 400µVP-P with no capacitance on the output, as shown in Figure 19. These noise measurements are made with a 2 decade bandpass filter made of a 1 pole high-pass filter with a corner frequency at 1/10 of the center frequency and 1-pole low-pass filter with a corner frequency at 10 times the center frequency. Figure 19 also shows the noise in the 10kHz to 1MHz band can be reduced to about 50µVP-P using a 0.001µF capacitor on the output. Noise in the 1kHz to 100kHz band can be further reduced using a 0.1µF capacitor on the output, but noise in the 1Hz to 100Hz TABLE 1. EXAMPLE OF BATTERY LIFE IN YEARS FOR ISL21080 IN VARIOUS POWER ON CONDITIONS WITH 1.5µA MAX CURRENT BATTERY RATING (mAH) CONTINUOUS 50% DUTY CYCLE 10% DUTY CYCLE 40 3 6 30* 225 16.3* 32.6* 163* NOTE: *Typical Li-Ion battery has a shelf life of up to 10 years. VIN = +3.0V 0.001µF TO 0.01µF SERIAL BUS VIN VOUT GND ISL21080 REF IN ENABLE SCK SDAT A/D CONVERTER 12 TO 24-BIT 0.01µF 10µF FIGURE 17. FIGURE 18. ISL21080 USED AS A LOW COST PRECISION CURRENT SOURCE +8V TO 28V 0.01µF VIN VOUT ZOUT 10k Ω RSET 0.1% 10ppm/°C ISY ~ 0.31µA IL AT 0.1% ACCURACY ~150.3µA ISL21080-1.5 > 100M Ω ISET VOUT ISET = RSET IL = ISET + IRSET VOUT = 1.5V GND ISL21080 |
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