ICL7109CQH+D

Number of A/D Converters:	1
Base Part Number:	ICL7109
Supplier Device Package:	44-PLCC (16.59x16.59)
Package / Case:	44-LCC (J-Lead)
Operating Temperature:	0°C ~ 70°C
Features:	--
Voltage - Supply, Digital:	±5V
Voltage - Supply, Analog:	±5V
Reference Type:	External
Architecture:	Dual Slope
Series:	--
Ratio - S/H:ADC:	--
Configuration:	ADC
Data Interface:	Parallel
Input Type:	Differential
Number of Inputs:	1
Sampling Rate (Per Second):	30
Number of Bits:	12
Part Status:	Active
Packaging:	Tube

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Introduction

Data acquisition is an important part of any infrastructure or control system. It involves the collection, analysis, and storage of data from different sources. Analog to digital converters (ADC) are a key element of the data acquisition system since they are responsible for converting the physical signals, such as voltage and current, into a digital signal for further processing. The ICL7109CQH+D is an integrated circuit manufactured by Intersil Corporation, which is dedicated to the conversion of this type of signals from analog to digital. This paper will discuss its application field and working principle.

Application Field

The ICL7109CQH+D is a high-precision, 8-bit analog-to-digital converter designed for industrial applications. It has an adjustable 0 to 5 volt input range and is capable of converting intrapolar signals, that is, signals that have both positive and negative values. This makes it suitable for a number of applications, including, but not limited to:

• Data acquisition systems
• Power inverters
• Digital control systems
• Electrical motor controllers
• Industrial and home automation
• Process control systems

The device is also used in audio/video systems and optical detection systems due to its excellent linearity and accuracy, and its minimal temperature dependant errors over a wide temperature range. Additionally, it is often used for voice and data analysis, such as in cellular telephones and radar systems.

Operating Principle

The ICL7109CQH+D is an integrated circuit consisting of an 8-bit Parallel Binary ADC (PBAC), a Multiplexer (MUX), and a Reference Voltage Source. The PBAC operates as the core of the circuit, converting the incoming analog signals into a digital equivalent. In order to do this, the PBAC samples the analog signal, digitizing it into an 8-bit binary value. This binary value is then fed to the MUX and Reference Voltage Source, which provide the necessary reference voltage used in the conversion process. The Reference Voltage Source is responsible for providing the reference voltage to the PBAC. It is a stable, low-noise voltage regulator which is adjustable from 0V to 5V. This allows for high precision conversions, as the reference voltage is consistent for each conversion cycle. The MUX is the bridge between the input and the PBAC, and is used to switch between different input channels. The MUX is capable of switching between two channels at a rate of 2MHz and is highly accurate, allowing for a maximum sampling rate of up to 10KHz.

Conclusion

The ICL7109CQH+D is an integrated circuit designed to convert analog signals into digital signals. It is used in a variety of applications ranging from industrial control systems to audio/video systems and radar systems. The device consists of an 8-bit PBAC, MUX, and Reference Voltage Source which operate together to provide a reliable and accurate conversion of the input signal.

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