24비트 ADC 모듈 -ADS127L11
(ADC 23 CLICK)
개요
- 본 제품은 24비트 ADC 모듈 -ADS127L11입니다.
- ADS127L11 칩을 장착하고 있으며, 와이드 밴드 필터를 사용하여 400ksps까지, low-latency 필터를 사용하여 1067ksps까지의 데이터 레이트를 가집니다.
- SPI 인터페이스를 가지고 있습니다.
특징
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HOW DOES IT WORK?
ADC 23 Click is based on the ADS127L11, a wide-bandwidth 24-bit delta-sigma analog-to-digital converter from Texas Instruments. The digital filter is configurable for wideband or low-latency operation, which optimizes wideband AC performance or data throughput for DC signals. It is optimized to provide high resolution with low power consumption. The delta-sigma demodulator produces low-resolution, high-frequency data, after which the noise is removed. The digital filter simultaneously decimates and filters the modulator data, thus providing the high-resolution final output data.
The ADS127L11 integrates input and reference buffers to reduce signal loading. You can choose onboard ADR4525, an ultralow noise high-accuracy voltage reference from Analog Devices for a reference voltage. Or you can choose an external one over the VEXT header. The selection can be made over the VREF SEL jumper. The internal voltage reference of 2.5V is set by default. The ADC can operate with an external clock or an internal oscillator. The nominal value of the clock is 25.6MHz in high-speed mode and 3.2MHz in low-speed mode. You can add an external oscillator over the CLK header.
The analog input of the ADC is differential, with the input defined as a difference voltage, and you should drive the input with a differential signal for the best performance. For this purpose, the ADC 23 Click is equipped with two SMA connectors.
ADC 23 Click uses a standard 4-Wire SPI serial interface to communicate with the host MCU, supporting SPI mode 1. The ADC can be reset over the RST pin. The start STR pin synchronizes the digital process, and if the STR pin is in a HIGH logic state, the ADC immediately begins conversions with the data-ready DRY pin pulsing for each conversion. The latency is defined as the time from synchronization to the falling edge of the DRY pin.
This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. Also, this Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used as a reference for further development.
SPECIFICATIONS
Type ADC Applications Can be used for the development of data acquisition (DAQ) measurement devices, shock and vibration instruments, condition monitoring, sonars, electroencephalograms, power quality analyzers, and more On-board modules ADS127L11 - wide-bandwidth 24-bit delta-sigma analog-to-digital converter from Texas Instruments Key Features Programmable data rate, selectable digital filter (wideband and low-latency filters), power-scalable architecture, input and reference pre-charge buffers, internal or external clock, and more Interface SPI ClickID Yes Compatibility mikroBUS Click board size M (42.9 x 25.4 mm) Input Voltage 3.3V or 5V