LTC2489CDE#PBF

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The LTC2489CDE#PBF is an accurate, low power, 8/16-bit, analog-to-digital converter (ADC) with an onboard reference.It occupies little board space with a small 4mm x 4mm QFN package. It provides a tiny but competitively priced alternative to other ADC solutions. Moreover, the device is designed to consume very low power, yet it achieves very high ac-curate conversion performance. It is well suited for applications in the automotive, industrial and medical fields.

Overview

The LTC2489CDE#PBF is a resolution-improved version of the LTC2488, a high performance ADC module with excellent dynamic performance and low total harmonic distortion. It is an 8-bit and 16-bit successive approximation register (SAR) type ADC with features such as low power consumption and noise immunity.

The LTC2489CDE#PBF offers an 8-bit plus 4-bit Cap-Integration conversion and a 16-bit plus 4-bit Cap-Integration conversion, with an onboard reference. It incorporates an automatic reference \'slope adjust\' which allows the user to accurately set the output range without having to adjust the reference voltage. It also provides selectable input ranges of 0-3.3V, 0-5V, ±3V, and ±5V, making it suitable for a broad range of applications. Other features include a \'partial conversion\' mode, where the user can select any number of input channels for simultaneous conversion, reducing power consumption further.

The LTC2489CDE#PBF requires very low power, making it well suited for both battery-operated and portable applications. The core power supply tolerance is 10%, and its power consumption is typically 3.2mW with a maximum channel current of 20µA. It features a low profile QFN package, and its small footprint reduces the PC board area needed for implementation.

Operating Principle

The LTC2489CDE#PBF operates using a successive approximation register (SAR) architecture. In the SAR architecture, the analog input is converted to a digital value by cycling through various bits of the data register, adjusting them until the correct digital value is obtained.

The operation of the LTC2489CDE#PBF is largely divided into two steps: 1) capacitive integration of the input and 2) SAR conversion of the result of the first step, resulting in an 8/16-bit digital value. In the first step, the device integrates an analog voltage with a capacitor, the output of which is the result of the integration. In the second step, the SAR part of the device stores and cycles through values within the data register until it finds the correct digital value for the analog voltage.

Application fields

The LTC2489CDE#PBF is designed to be a low-cost, high-performance ADC with a small footprint. Its small size and low power consumption make it ideal for battery-operated and portable applications. Additionally, its built-in auto reference slope adjust feature allows design engineers to easily set accurate ranges without having to manually adjust the reference voltage. These features make the LTC2489CDE#PBF well suited for applications in the automotive, industrial, and medical fields.

In automotive applications, the LTC2489CDE#PBF can be used to measure engine temperature, pressure, and other engine parameters, as well as for vehicle headlight control, speed and distance monitoring, and driver alert systems. In industrial applications, it can be used for data acquisition and in medical applications for patient monitoring.

Conclusion

The LTC2489CDE#PBF is an accurate, low-power, 8/16-bit resolution, analog-to-digital converter with onboard reference and a small package size. It is designed to consume very low power, yet achieve a high accurate conversion performance. The device is ideal for battery-operated and portable applications, and is well suited for use in the automotive, industrial and medical fields.

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