MAX187BCWE+

Number of A/D Converters:	1
Base Part Number:	MAX187
Supplier Device Package:	16-SOIC
Package / Case:	16-SOIC (0.295", 7.50mm Width)
Operating Temperature:	0°C ~ 70°C
Features:	--
Voltage - Supply, Digital:	5V
Voltage - Supply, Analog:	5V
Reference Type:	Internal
Architecture:	SAR
Series:	--
Ratio - S/H:ADC:	1:1
Configuration:	S/H-ADC
Data Interface:	SPI
Input Type:	Single Ended
Number of Inputs:	1
Sampling Rate (Per Second):	75k
Number of Bits:	12
Part Status:	Active
Packaging:	Tube

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Data Acquisition – Analog to Digital Converters (ADC)

Analog-to-digital converters (ADCs) are devices used to convert analog signals into digital signals. ADC is an important technology used in many industries including automation, aerospace, navigation, and machine control. The MAX187BCWE+ is a versatile pump-up CMOS successive approximation A/D converter (SAR ADC) developed by Maxim Integrated that provides excellent performance in a small package size.

Features of MAX187BCWE+

The MAX187BCWE+ ADC offers a sampling rate of up to 65ksps that supports a wide range of electronic control applications. It has an excellent signal-to-noise ratio of >87dB and a low total harmonic distortion of 0.004%. Moreover, it features high linearity which provides excellent accuracy and resolution even in low-light levels. Additionally, it has an excellent input range of 2.500V to 5.000V and can operate from a single +3V to +5V power supply.

PIN functions and Applications

The MAX187BCWE+ consists of 8 pins and has four main sections to the converter: control logic, sample and hold, an operational amplifier, and clock generator. The functions of the pins include: - Pin 1: Data Out - the output terminal for the digital output data; - Pin 2: Clock - used for the conversion rate clock, provided by an external clock source; - Pin 3: Command Input - the input pin used to control data flow and to turn on the converter; - Pin 4: Analog Input+ - the positive reference input used to connect ground-referenced input signals;- Pin 5: Analog Input- - the negative reference input which is driven by the output of an operational amplifier;- Pin 6: Reset - used to reset the converter and the sampling rate; - Pin 7: Reference Input - a voltage reference which is used to set the input range of the converter; - Pin 8: Power Supply - the power supply input pin used to provide the converter with power.These 8 pins work together to facilitate its operation and provide functions including a two-step conversion process, programmable conversion rate, adjustable reference voltage, powerdown capability, and improved dynamic performance. The MAX187BCWE+ is suitable for various applications such as signal conditioning, signal filtering, data logging, and analog measurements. It is commonly used in industrial automation, medical systems, industrial process control, and automotive electronics.

Working Principle

The MAX187BCWE+ ADC uses the successive-approximation (SAR) technique to convert the analog input signal into digital format. This technique involves using a voltage reference to create a staircase voltage level and comparing the input voltage to these voltage levels. Each time a comparison is made, the result is stored in a register. When the comparison is complete, the register is read, which gives the binary representation of the analog input signal.The voltage reference is created by pass transistors, and the comparator is connected to the clock input of the ADC. The clock is pulsed until the comparator output is 0. At this point, the input voltage has been compared with the voltage reference and a digital result has been stored in the register. The register is then read to obtain the digital representation of the analog input signal. The main advantage of the SAR technique is that it has a high accuracy and resolution as compared to other techniques. It also requires fewer external components and has a low power consumption.

Conclusion

The MAX187BCWE+ is a versatile pump-up CMOS successive approximation A/D converter developed by Maxim Integrated that is suitable for various data acquisition or signal conditioning applications. It provides excellent performance with a sampling rate of up to 65ksps, a signal-to-noise ratio of >87dB, low total harmonic distortion of 0.004%, and a high linearity that provides excellent accuracy and resolution even in low-light levels. The MAX187BCWE+ is also power efficient and easy to implement as it requires fewer external components.

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