LTC1663-8CMS8

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Data acquisition systems rely on devices to acquire, transmit and process signals received. Digital-to-analog converters (DACs) are important devices which convert a digital number into an analog voltage or current. The LTC1663-8CMS8 is one such DAC, belonging to the family of LTC 1663-8 series DACs, being high performance and integrated into a compact size. This application note will provide an introduction to its application field, analyze the technology behind it, and discuss its working principle.

Application Field:

The LTC1663-8CMS8 is a versatile, but typical DAC for many applications where high performance, low jitter and low power consumption are key concerns. It is ideal for industrial, commercial, automotive, medical and communication applications. This chip can process digital audio signals, control position (servo, stepper and brushless motors) and can also be used for digital-to-analog signal conversion.

For instance this DAC can be used as an interface in process control systems like temperature and pressure sensor calibrations and microprocessor-controlled measurement systems. In robotics, it can be integrated into the motor motion control; it can convert digital encoded motion commands into analog control signals. Likewise, it can be employed in driving the motor loads such as solenoids, coils and loudspeakers with an analog signal.

In audio systems, the DAC can be used in audio signal-processing algorithms such as volume, bass, treble and tone control. This device is also suitable for operating Class D amplifiers and D/A signal processors which require high precision, linearity and low distortion for high-quality audio processing.

Technology:

The LTC1663-8CMS8 is available in a 3mm x 4mm MSOP-8 package, designed for low profile and space constraints. It has a supply voltage (VDD) range from 2.7V to 5.5V and an operating temperature range from –40 to +85 degrees Celsius. This chip has a noise-tolerant 3-wire serial interface and control, as well as low-power CMOS technology to improve performance, increase switching noise immunity and still retain low power consumption.

This DAC is also more power-oriented, with a 13-bit resolution that consumes a total of 11mW and requires no laser-trimmed external components, saving more power and cost. Its amplitude accuracy is within +/- 0.5% and ± 0.1LSB. The LTC1663-8CMS8 DAC also provides excellent linearity between each step; the non-linearities are below –96dB. It includes a built-in AC and DC power monitor to detect power loss and output noise.

Working Principle:

As a digital-to-analog converter, the LTC1663-8CMS8\'s main function is to convert digital input data (in binary) into corresponding analog voltage or current. This digital-to-analog conversion process consists of several stages. First, the digital input data is converted into a binary-weighted digital word. This weighting process is analogous to a binary counter; each step brings the digital word one bit closer to the desired analog output value.

The second step is performing a summer-averaging operation; the outputs from a summer-averager are combined to achieve the desired analog voltage or current output. In the last stage, the DAC applies an analog output filter to improve linearity and accuracy, as well as eliminate high-frequency noise. The analog output filter is designed to remove any high-frequency noise or distortion caused by the DAC.

In summary, the working principle of the LTC1663-8CMS8 DAC is an efficient mixture of 3 main elements: 1) digital data to a binary-weighted digital word conversion; 2) summer-averaging operation; and 3) applying an analog output filter. This process enables the device to provide precise current, voltage, or pulse signals with low distortion, noise and power consumption.

Conclusion:

The LTC1663-8CMS8 DAC is a high performance, low noise and low power consumption device which converts digital input data into corresponding analog voltage and current outputs. Its application fields color many fields such as industrial, automotive, medical applications due to its versatility, small size and excellent technical performances such as amplitude accuracy, linearity and power efficiency. It works under the principle of converting digital data into a binary-weighted digital word, summer-averaging operation and applying an analog output filter.

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