ADC 20 Click Board™

Product Code: MIKROE-5424

How Does The ADC 20 Click Board™ Work? The ADC 20 Click Board™ is based on the TLA2518, a small, eight-channel, multiplexed, 12-bit, 1-MSPS, analogue-to-digital converter (ADC) from Texas Instruments. The TLA2518 has an internal oscillator for the ADC conversion process and supports averaging multiple data samples with a single conversion start. Also, the built-in programmable averaging filters, which output a 16-bit result for enhanced resolution, help reduce noise from the analogue inputs and the number of data samples required to be read by the host MCU. The analogue input channel selection can be auto-sequenced to simplify the digital interface with the host MCU. This Click board™ communicates with MCU through a standard SPI interface, supporting all four SPI-compatible protocols (SPI Mode 0, 1, 2, and 3) to access the device, and operates at clock rates up to 60MHz for all configurations and information management and acquiring conversion results. As mentioned, the TLA2518 powers up in Manual mode and can be configured into either of three operational modes by writing the configuration registers for the desired mode.

The Manual mode allows the host MCU to directly select the analogue input channel, while in the second, the On-the-Fly mode of operation, the analogue input channel is set using the first five bits on the SDI signal without waiting for the CS rising edge. This way, the ADC samples the newly selected channel on the CS edge, and there is no latency between the channel selection and the ADC output data. In the third Auto-Sequence mode, the internal channel sequencer switches the multiplexer to the next analogue input channel after every conversion. In addition to the fact that all eight channels, also including channels on the side headers, can be used as analogue input pins, this board allows for some channels, in this case, channels CH0, CH1, CH6, and CH7 of the TLA2518 to be configured as digital inputs, open-drain digital outputs, and push-pull digital outputs. This ADC 20 Click Board™ can operate with both 3.3V and 5V logic voltage levels selected via the VCC SEL jumper. This way, it is allowed for both 3.3V and 5V capable MCUs to use the communication lines properly. However, the 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 It can be used for general-purpose remote data acquisition to industrial applications On-board modules TLA2518 - analogue-to-digital converter (ADC) from Texas Instruments Key Features Eight user-configurable channels, open-drain, push-pull digital outputs, wide operating ranges, SPI serial interface, high speed, high performance, high resolution, programmable averaging filters, and more Interface SPI Compatibility mikroBUS Click board size M (42.9 x 25.4 mm) Input Voltage 3.3V or 5V PINOUT DIAGRAM This table shows how the pinout on f the ADC 20 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes Pin Pin Notes NC 1 AN PWM 16 NC NC 2 RST INT 15 NC SPI Chip Select CS 3 CS RX 14 NC SPI Clock SCK 4 SCK TX 13 NC SPI Data OUT SDO 5 MISO SCL 12 NC SPI Data IN SDI 6 MOSI SDA 11 NC Power Supply 3.3V 7 3.3V 5V 10 5V Power Supply Ground GND 8 GND GND 9 GND Ground ONBOARD SETTINGS AND INDICATORS Label Name Default Description LD1 PWR - Power LED Indicator ADC 20 CLICK ELE