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The limitations of the on chip reference should also be recognized, however. No more than a 1mA load should be applied. The integrating resistor should dxtasheet large enough to remain in this very linear region over the input voltage range, but small enough that undue leakage requirements are not placed on the PC board.

For mV full scale where noise is very important, a 0. This is dxtasheet over-range is a low dissipation mode, with the three least significant digits blanked. Operating Conditions Temperature Range. Integrating Capacitor The integrating capacitor should be selected to give the maximum voltage ic,7106 that ensures tolerance buildup will not saturate the integrator swing approximately. On the 2V scale, a 0. Deintegrate Phase The final phase is deintegrate, or reference ddatasheet.

The analog input required to generate full scale output counts is: However, if a negative supply is not available, it can be generated from the clock output with 2 diodes, 2 capacitors, and an inexpensive lC.

Submit Document Feedback 7 FN Please go to the web to make sure that you have the latest revision. Similarly, units with a negative TC may cycle between overrange and a non-overrange count as the die alternately heats and cools.

For these critical applications the integrator output swing can be reduced to less than the recommended 2V full scale swing with little loss of accuracy. B1 maximum dimensions datasbeet not include dambar protrusions. For instance, in a weighing system, the designer might like to have a full scale reading when the voltage from the transducer is 0.


Note that 40kHz 2. The same holds true for the reference voltage. To achieve maximum rejection of 60Hz pickup, the signal integrate cycle should be a multiple of 60Hz. The negative input signal drives the integrator positive when most of its swing has been used up by the positive common mode voltage.

While other types of capacitors are adequate for this application, polypropylene capacitors give undetectable errors at reasonable cost. Thus, it can be used as the negative supply for externally generated segment drivers such as decimal points or any other presentation the user may want to include on the LCD display.

Auto-Zero Capacitor The size of the auto-zero capacitor has some influence on the noise of the system. However, icl7160 a large common mode voltage exists i.

A worst case condition would be a large positive common mode voltage with a near full scale datasgeet differential input voltage. An external oscillator connected to pin The oscillator frequency is divided by four before it clocks the decade counters.

The input signal can be referenced to the center of the common mode range of the converter. Due to their higher thermal resistance, plastic parts are poorer in this respect than ceramic. Included are seven segment decoders, display drivers, a reference, and a clock. The BP frequency is the clock frequency divided by This is selected to give a minimum end-of-life battery voltage of dataheet 6V.

Auto-Zero Phase During auto-zero three things happen.

Allowable dambar protrusion shall be 0. Ilc7106 furnished by Intersil is believed to be accurate and reliable. This may burn the LCD display if maintained for extended periods. However, care must be exercised to assure the integrator output does not saturate. Finally, the true economy of single power supply operation ICLenables a high performance panel meter to be built with the addition of only 10 passive components and a display.


The main source of common mode error is a roll-over voltage caused by the reference capacitor losing or gaining charge to stray capacity on its nodes.

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In either case, an external reference can easily be added, as shown in Figure 4. These are signal integrate countsreference deintegrate 0 to counts and auto-zero to counts. All Rights Reserved Intersil and design is a trademark owned by Intersil Corporation or one of its subsidiaries. If reference can be conveniently tied to analog COMMON, it should be since this removes the common mode voltage from the reference system.

ICL Datasheet Intersil pdf data sheet FREE from

Do not operate at or near the maximum ratings listed for extended periods of time. Figure 10 shows this application. About Intersil Ratasheet Corporation is a leading provider of innovative power management and precision analog solutions. Signal Integrate Phase During signal integrate, the auto-zero loop is opened, the internal short is removed, and the internal input high and low are connected to the external pins.

N is the maximum number of terminal positions. This makes the system slightly quieter and also avoids a divider network on the input. Dimensions D and E to be determined at seating plane -C.

This makes a complete measure cycle of 4, counts 16, clock pulses independent of input voltage. The integrator output can swing to within 0. See the ICL datasheet for an alternative. Calibration is achieved by placing the sensing transistor in ice water and adjusting the zeroing potentiometer for a