ADS7809UB

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Analog to Digital Converters (ADC) are essential devices in electronics to convert analog signals into digital outcomes. The ADS7809UB is a 10-bit Flash ADC from Texas Instruments that has been designed for high performance applications. It is part of the low power consuming "Ultralow-Power" range from Texas Instruments and requires only one supply voltage of between 2.7V and 5.5V. The ADS7809UB is designed to operate over temperatures ranging from -40 to +85 degrees Celsius. Its fast sample rate of 5 MHz allows it to capture signals without difficult sample rate selection. The ADS7809UB is also integrated with an internal voltage reference and a reference buffer.The ADS7809UB has multiple applications. It can be used to sample signals in power supply networks or industrial systems, especially in noise-sensitive and high accuracy applications, given its ability to reduce noise components by comparing adjacent codes. Moreover, it is used in medical instrumentation and in radio-frequency (RF) receivers, because of its low noise performance, and high integrability with few additional external components. Lastly, the ADS7809UB can be used to digitize analog signals in photosensitive systems such as digital X-ray imaging. The ADS7809UB has an advanced architecture that allows for high noise immunity and low propagation delay. Its comparator, kept at the end of the pipeline, allows for fast and accurate conversion. The chip is composed of a flash array, an output latch, a clock divider, and a reference buffer, which are all driven by a differential reference voltage divided into N sublevels. This differential voltage is sustained by the standard reference buffer, which is measured from a temperature compensating internal bandgap reference. The basic principle of operation can be established as follows. The device is linked to the analog input, the comparison reference of the comparator, and the reference buffer of the ADC. It captures continuous, differential analog signals and converts them into binary coded digital words. These digital words are latched, based on the comparator saturation, and transferred to an output latch.The comparator, located in the feedback loop, samples and compares the signals against the threshold voltage provided by the internal reference. In the case of the ADS7809UB, this is a 10-bit comparator, meaning that the output is composed of 1024 different grey scales, from 0 to 1023. The conversion resolution, in turn, is determined by the number of comparator steps during the process. The general formula to calculate the resolution is given by log_2(N), being N the number of steps. In this case, N = 1024 (2^10) which gives a resolution of 10 bits. Once the signals are compared to the reference, the results are latched by the output latch and, then, propagated to the digital output of the chip. The propagation delay of the output latch is temperature dependent, and on the ADS7809UB, this delay is of 250ns, on average.The ADS7809UB is a highly integrable and low power consuming 10-bit flash ADC. It has a wide array of applications, ranging from power supply networks to medical instrumentation, due to its fast sample rate, accuracy, low noise performance and excellent temperature range. Its advanced architecture allows for a high noise immunity and low propagation delay thanks to its comparator located in the feedback loop that is used to compare the input signals against the threshold provided by the Internal reference buffer.

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