LTC1297CCN8#PBF

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LTC1297CCN8#PBF is categorized under data acquisition, ADCs/DACs and special purpose applications. This article introduces the main functions and principles of working of LTC1297CCN8#PBF device and its applications as well.

The LTC1297CCN8#PBF is a monolithic, voltage output, 8-bit successive-approximation analog-to-digital converter. It contains an 8-bit successive approximation register, integrating a sample and hold circuit, comparator, clock operator, reference buffer and voltage output latch. The device has excellent DC accuracy and dynamic performance.

Functional Description

The LTC1297CCN8#PBF has eight input channels which support single-ended analog inputs or two differential non-interacting channel input. The device is sample and holds (S/H) the analog voltage at the positive input of each channel for subsequent conversion by the successive approximation A/D converter. The S/H is triggered by internal logic and accepts the signal at single-ended analog input connection or common pin of the two-channel differential input connections.

Working Principle

The LTC1297CCN8#PBF utilizes a successive approximation conversion method to digitally encode input voltage signals into 8-bit digital words. Voltage conversion time is determined by the internal clock signal. The logic signals controlling the A/D conversion process internally are derived from an oscillator (OSC) with a center frequency of 1.2MHz.

The procedure for successive approximation conversion starts with the reset of a SAR (Successive Approximation Register) by a conversion start signal. Once the SAR is reset, the internal clock signal causes the SAR comparator to take a sample of the signal being converted and then compares it with an internal reference determined by the DAC (Digital to Analog Converter).

The SAR makes an approximation based on the comparison by adjusting the voltage of the output port in small steps. This is repeated until the output of the DAC is within a set tolerance of the signal being measured or the logic levels of the signal have reached a value where the signal could be interpreted as a binary number. At the end of a successful conversion, the SAR’s output is latched into an 8-bit word, along with the status of the MSB (MSB) bit.

Applications

The LTC1297CCN8#PBF is intended for a wide range of special purpose applications, such as precision measurement systems, instrumentation, process control, telecommunications, data acquisition and record keeping. Additionally, the device is suitable for applications that require exceptional acquisition performance, small size and low supply voltage. The flexible features of the device, together with design simplicity, small size and low power, makes it ideal for cost-sensitive single-chip applications.

All in all, the LTC1297CCN8#PBF is a versatile and efficient, monolithic 8-bit successive approximation A/D converter that can be utilized in a wide variety of data acquisition and special purpose applications. With its high accuracy, fast conversion time and low power consumption, it is well suited for applications requiring the utmost precision and reliability.

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