MCP3204-BI/P

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Data Acquisition is a process of extracting data from different sources and compiling them into meaningful information. Analog to Digital Converters (ADC) is an important component of Data Acquisition that aids in measuring, processing, and interpreting data. MCP3204-BI/P is a high performance, low cost, 12-bit analog to digital converter specifically designed for applications that require a low power and small form factor.

Overview

The MCP3204-BI/P is a successive approximation, 12-bit Analog to Digital Converter (ADC) with an onboard differential amplifier. It is available in a small 6-pin TSOT package, making it ideal for applications with a limited amount of space. This device is capable of sampling rates up to 33ksps and provides a variety of features including a 4-channel differential input configuration and a conversion time as low as 75 μs. Additionally, it is powered from a single +2.7V to +5.5V power supply and has a low power consumption of 1.6mW.

Application Fields and Working Principle

Given its low cost, low power, and accurate conversion performance, the MCP3204-BI/P is well suited for a variety of Data Acquisition applications, ranging from portable instrumentation to signal conditioning in industrial environments. Common applications include motor control feedback, medical instrumentation, and process control. Additionally, the device is well suited for mobile applications such as portable Patient Monitors and Handheld Test Equipment.

The MCP3204-BI/P works by using a successive approximation technique to sample the input signal and convert it into a digital representation. The device utilizes an onboard differential amplifier that amplifies the differential signal between two non-grounded inputs to a level that is acceptable for the ADC. The amplified signal is then provided to the analog input of the successive approximation register, which consists of an input latch, comparator, and 8-bit counter. The counter allows the device to sample at a rate of 33ksps with a conversion time of 75 μs.

The device uses a four-level output code format in which each level corresponds to an 8-bit binary number. The levels are then compared to the analog input signal to determine the digital output code. The output codes are then stored in the integrated FIFO-like RAM. The device can store up to eight output codes, which can then be read out through the Serial Peripheral Interface (SPI) or buffered parallelly through 4-wire I/O port. The MCP3204-BI/P also includes a package specific Shutdown Mode, which allows the device to operate in a low power “standby” mode with a current consumption of less than 0.1 uA.

Key Features

The MCP3204-BI/P has a variety of features that make it an attractive choice for analog to digital conversion in Data Acquisition applications. These features include:

• 4-Channel Differential Input Configuration
• 10-bit or 12-bit Resolution
• 2.7V to 5.5V Single +2.7V to +5V Analog Supply Voltage
• Conversion Rate up to 33ksps
• Up to 8 Output Codes Stored in an Integrated FIFO-Like RAM
• SPI and 4-Wire I/O Data Port
• Package Specific Shutdown Mode

Conclusion

The MCP3204-BI/P is an ideal Analog to Digital Converter for a variety of Data Acquisition applications, due to its low cost, low power, and accurate conversion performance. It features a variety of features, including a 4-channel differential input configuration, a conversion rate up to 33ksps, and a package specific Shutdown Mode. As such, it is well suited for applications in the industrial and mobile sectors, making it an attractive choice for Data Acquisition.

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