1. less than the 3ppm/° c temperature coefficient, which determines the effect of temperature changes on the ADC data collection, 3ppm/that is one degree of change can cause voltage reference three out of 10,000 changes, so there is a high quality voltage reference is so important!
2. less than ± 0.1% initialization accuracy error is the output voltage and the reference value, it determines a number of product consistency.
3. noise less than 10uVp-p, the noise voltage reference output will also directly affect the accuracy of the ADC, the noise is within 0.1Hz to 10Hz, added 0.1-10Hz after a low pass filter effectively reduces low-frequency noise, the following figure:

1. Estrada Adc Módulo de Aquisição de Dados

2. Ads1256 24 Adc8 Road ad -precision Adc Data Acquisition Module

Product features:

1. A0-A7 ADC, 8 input channels can be easily configured for differential and single-ended inputs.
2. low temperature drift and low noise Vishay wafer metal film resistors.
3. input filter capacitor (104), one per channel.
4. high speed LDO with low noise, high PSRR, low quiescent current.
5. high frequency digital signal decay resistance, isolation external high frequency noise.
6. ADR03 2.5V voltage reference, OPA350 0.1Hz~10Hz low pass filter circuit is composed of cache memory, and large-capacity tantalum capacitors and ceramic capacitor in parallel with wafers and low-noise metal film resistor, effectively suppressing low-frequency noise.
7. tantalum capacitor 100uF bulk filtering, and composed of inductors LC filter circuit, making power more pure.
8. analog signal and digital signal wiring separately.
9. added GND, 2.5V, 3.3V, test points, and make it easier to debug the circuit.

Picture Show:

3. Componentes Ativos

Parts of the program code:

4. Circuitos Integrados

Schematics and related information provided, STM32, STM8,C51 has adjusted the program procedure is simple and straightforward, and can save you a lot of development time.

Measured results

Following is measuring the AD584L voltage reference module serial output the results, and beat no more than plus or minus 2uV almost half a meter and 1/6 PK.

5. Componentes e Aparelhos Eletrônicos

Connection mode

6. Estrada Adc Módulo de Aquisição de Dados

7. Ads1256 24 Adc8 Road ad -precision Adc Data Acquisition Module

And the STM32 MCU connections

8. Componentes Ativos

9. Circuitos Integrados

Pictured above is a hardware SPI connection or software analog SPI, so that the line is casual, one-on-one connections.

Dimensions

10. Componentes e Aparelhos Eletrônicos

11. Estrada Adc Módulo de Aquisição de Dados

12. Ads1256 24 Adc8 Road ad -precision Adc Data Acquisition Module