Number of A/D Converters:	1
Base Part Number:	LTC2420
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Operating Temperature:	0°C ~ 70°C
Features:	--
Voltage - Supply, Digital:	2.7 V ~ 5.5 V
Voltage - Supply, Analog:	2.7 V ~ 5.5 V
Reference Type:	External
Architecture:	Sigma-Delta
Series:	microPOWER™
Ratio - S/H:ADC:	--
Configuration:	ADC
Data Interface:	SPI
Input Type:	Single Ended
Number of Inputs:	1
Sampling Rate (Per Second):	7.5
Number of Bits:	20
Part Status:	Active
Packaging:	Tube

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Data Acquisition - Analog to Digital Converters (ADC)

The LTC2420CS8#PBF integrated circuit by Linear Technology offers a highly linear, low-power, 24-bit, voltage to digital solution. This part is a general purpose analog to digital converter, widely used in applications that require precision measurements. This device is a versatile chip used in many different applications and many different systems, with a wide range of measurable input voltages.

Overview

The LTC2420CS8#PBF includes a high-speed 24-bit sigma-delta analog-to-digital converter with a 9th order sigma-delta modulator and an integrated 20MHz oscillator. The device also includes a low-noise, variable gain amplifier, a wide range voltage reference, a maximum sample rate of 500kSPS, and a noise free code of ±2LSB typical. The LTC2420CS8#PBF utilizes a 5V single supply and provides ±5V differential input voltage range, which is the largest available for any of the integrated solutions available. The control pins on the device allow power saving reference current level settings, as well as a wide range of gain settings. Electrical isolation is not required, as the device includes a five-level overvoltage protection scheme.

Integral and Differential Nonlinearity

The linearity of this device is one of its most significant features. The integral (INL) and differential (DNL) nonlinearity specifications guarantee a high degree of linearity over a wide range of inputs. The maximum INL is ±0.8LSB and the maximum DNL is ±1.5LSB at optimal gain. The noise level is also very low, typical at 0.2LSB, making this solution suitable for highly accurate measurements.

Power Consumption

The power consumption of the LTC2420CS8#PBF is also very low, between 7mW at the 150kHz sample rate, to 50mW at the maximum sample rate of 500kHz. This makes this solution a great choice for battery-powered applications that must run for extended periods of time on a single battery.

Applications

The LTC2420CS8#PBF is an excellent choice for applications that require high dynamic range and precision measurements. The low power consumption and wide voltage range make it suitable for portable devices, such as medical devices and instrumentation. This converter can also be used in data acquisition, humidity and temperature sensing, automotive applications, aircraft instrumentation and process control.

Working Principle

The LTC2420CS8#PBF utilizes the delta-sigma analog-to-digital conversion. This method of conversion works by oversampling, that is, repeatedly measuring the same input voltage with higher and higher encoding resolution. The integrated, high-speed oscillator is the source of the clock signal for the delta-sigma process. As the input voltage is sampled, it is normalized and amplified in the input stage, which is then passed into the sigma-delta modulator. The modulator produces a sequence of digital pulses which are then decimated down to the required output resolution. The output represents the input voltage expressed as a digital value, expressed as a binary number. The output resolution can range from 13- to 24-bits, depending on the requirement of the application.

Conclusion

The LTC2420CS8#PBF is a low power, high linearity analog to digital converter, widely used in precision sensing applications. This device utilizes the highly efficient delta-sigma conversion process, and offers extremely low noise levels and power consumption, making it ideal for battery powered applications. This device can be used in data acquisition and instrumentation, automotive, aircraft and many other applications.

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