AD7472BRZ

Number of A/D Converters:	1
Base Part Number:	AD7472
Supplier Device Package:	24-SOIC
Package / Case:	24-SOIC (0.295", 7.50mm Width)
Operating Temperature:	-40°C ~ 85°C
Features:	--
Voltage - Supply, Digital:	2.7 V ~ 5.25 V
Voltage - Supply, Analog:	2.7 V ~ 5.25 V
Reference Type:	External
Architecture:	SAR
Series:	--
Ratio - S/H:ADC:	1:1
Configuration:	S/H-ADC
Data Interface:	Parallel
Input Type:	Single Ended
Number of Inputs:	1
Sampling Rate (Per Second):	1.5M
Number of Bits:	12
Part Status:	Obsolete
Packaging:	Tube

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AD7472BRZ Application Field And Working Principle

Introduction of AD7472BRZ

The AD7472BRZ is an integrated circuit of the Analog to Digital Converters (ADC) group manufactured by Analog Devices. It is a low-noise, high-accuracy, low-power 4-channel sigma delta ADC operating from a single 2.7 V to 5.5 V supply. With a sampling frequency range from 1 Hz to 500 kHz and a 0 dB f-S dynamic range, the AD7472BRZ is designed for industrial and automotive applications.The converter is composed of four single-ended input channels and one pseudo-differential input channel that are multiplexed to one single-ended output. The features provided by the AD7472BRZ include integrated decimation filter, on-chip programmable gain amplifier and sinc filter, 14-bits sample, and holds and 13-bit resolution. It is fully RoHS compliant, and has been rated with a temperature range of -40 to +125 °C.

Application Field of AD7472BRZ

The AD7472BRZ is a high-accuracy ADC specifically designed to meet the demanding requirements of industrial and automotive applications. This integrated circuit offers low noise performance and reliable operation over a wide temperature range. The AD7472BRZ is ideally suited for battery cell monitoring, automotive sensor interface, and various industrial measurements applications, like temperature sensors and strain gauges. Temperature sensing applications in automotive applications benefit from the device’s very low power consumption, which supports long-term battery operation. AD7472BRZ allows up to 500 nA current in power-down mode. Additionally, the device is suitable for use in medical instruments, like blood pressure/blood analyzers, as it offers superior accuracy and fast settling time even in harsh environments with high noise levels caused by motor integrity systems.

Working Principle of AD7472BRZ

The AD7472BRZ contains a low-noise modulator, a successive-approximation analog-to-digital converter, and a sinc filter, each of which is designed to ensure maximum accuracy and low power consumption.The low-noise modulator allows for the conversion of an analog signal into its digital equivalent. At the same time, the modulator performs an anti-aliasing function that prevents digital images from being present in the analog signal. The modulator consists of 3 stages: * Stage 1 is a low-noise pre-filter stage* Stage 2 is a single-slope A/D converter* Stage 3 is a post-filter stageEach stage is designed to reduce noise and maintain signal integrity. In order to maximize the accuracy of the conversion, the stages are carefully calibrated and trimmed.The successive-approximation analog-to-digital converter is responsible for the conversion of the analog input signal into a digital signal. It is composed of a comparator, a synchronous counter, and a successively-approximated register. The comparator allows the converter to determine whether an analog signal is larger or smaller than a reference voltage. The synchronous counter is then used to step through the various reference voltages and compare them with the analog signal. Finally, the successively-approximated register is responsible for saving the result of the comparison.The final stage of the AD7472BRZ is the sinc filter, which is designed to reduce noise and improve signal-to-noise ratio. It is composed of a resistor-capacitor network and an operational amplifier. The resistor-capacitor network is used to set the sampling frequency, while the operational amplifier is used to amplify the signal.

Conclusion

The AD7472BRZ is an integrated circuit specifically designed to meet the requirements of industrial and automotive applications. It is composed of a low-noise modulator, a successive-approximation converter, and a sinc filter, each of which is designed to ensure maximum accuracy and low power consumption. The AD7472BRZ is ideally suited for battery cell monitoring, automotive sensor interface, and various industrial measurements applications, like temperature sensors and strain gauges.

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