ICL7107 ADC Display Driver: Price, Application and Datasheet

ICL7107 is a high performance, low power, monolithic IC used for analog to digital conversions up to 31/2 digits.  It houses display drive circuitry inside it bypassing the need of connecting an external drive circuit. 

The input impedance is quite high. Polarity and digital drivers, segment decoders, voltage reference, and a clock circuit is already available on its board. ICL7107 is designed to connect LED display directly to it. 

The ADC uses a dual-slope conversion technique which inherently rejects interference signals from the ambiance. Rollover error is minimized less than one count which makes ICL7107 highly accurate.

Symbol

Footprint

3D Model

• Guaranteed zero reading for 0V input on all scales

• True polarity at zero for precise null detection

• 1pA typical input current

• True differential input and reference, direct display drive

- LED lCL7107

• Low noise - less than 15µVP-P

• On-chip clock and reference

• Low power dissipation - typically less than 10mW

• No additional active circuits required

• Enhanced display stability

• Pb-free (RoHS compliant)

Renesas Electronics America Inc. ICL7107CPLZ technical specifications, attributes, parameters and parts with similar specifications to Renesas Electronics America Inc. ICL7107CPLZ.

The ICL7107 is an ADC module with a resolution of 3 ½ bit, meaning it can display digital value from 0-1999. The ADC used here is a dual slop ADC, so the applied voltage is compared with a reference voltage and then is approximated to find the applied voltage. The speciality of this IC is that it has an in-built 4-digit 7-segment display driver inside it. So to display the measured voltage we simply have to hook up 7-segment display to the output of the IC and everything is ready. IT eliminates the need for MCU/MPU or programming.

The IC can measure voltages of maximum from -15V to +15V which is equal to the supply voltage. The digital output can vary from 0-1999 where each digit is displayed on a single 7-segment display. So if you are trying to measure voltage and display them on a 7-segment display without the use of MCU or programming then this IC might be the right choice for you.

Using ICL7107 is pretty straight forward, we just have to provide the reference voltage and set the internal clock for the ADC conversion to take place and we are all set. A basic sample circuit to measure voltage upto 200mV is shown below

The IC has an internal clock which can be set using the pins 38, 39 and 40 by using a Resistor capacitor network. The formulae to calculate the set oscillator frequency is shown below; typically the value is set to 48 kHz

FOSC = 0.45/RC

Once the clock is set we have to provide the reference voltage for the ADC conversion to take place. The value of the measured analog voltage will then be displayed on the 7-segment display the increment of count can be calculated using the following formulae

The accuracy and the range of the measured voltage can be measured by using external circuits involving potential divider or op-amps but as always there is a trade off between the accuracy and range. You can refer the datasheet at the end of this page to know more technical details.

●Used in digital voltmeter

●Used in digital ammeter

●Used in instrument panel display

●Used in applications based upon non-programming modules.

Renesas Electronics Corporation is a Japanese semiconductor manufacturer headquartered in Tokyo, Japan, initially incorporated in 2002 as Renesas Technology, the consolidated entity of the semiconductor units of Hitachi and Mitsubishi excluding their dynamic random-access memory businesses.

In the 2000s to early 2010s, Renesas had been one of the six largest semiconductor companies in the world. As of 2014, it was the world's largest automotive semiconductor maker and the world's largest maker of microcontrollers. The company also has presences in the markets of analogue and mixed-signal integrated circuits, memory devices, and SoCs.

Download datasheets and manufacturer documentation for Renesas Electronics America Inc. ICL7107CPLZ.