El amplificador operacional MCP6411 de Microchip puede operar con tensiones a partir de 1,7 V y tiene una corriente quiescente de sólo 55 uA (max). El producto ganado x banda pasante es de 1MHz. Esta combinación de características hace que este componente sea ideal para aplicaciones portátiles. En este artículo se incluyen algunas aplicaciones posibles de este componente, sugeridas por el Datasheet (*).

 

(*) La hoja de datos se puede acceder desde el sitio web de Mouser Electronics en: http://www.mouser.com/pdfdocs/20005791a.pdf 

   

Además de las características indicadas, el MCP6411 posee una protección contra EMI mejorada, lo que es importante en aplicaciones sujetas a este tipo de problema.

   El MCP6411 se suministra en envoltorios SC70-5 y SOT-23 siendo construidos con un proceso avanzado CMOS. 

   En la figura 1 tenemos la envoltura y la identificación de los pines de este componente.

 

 


 

 

 

Las principales características eléctricas de este componente son:

Vdd - Vss: 6,5 V (max)

Corriente en los pinos de entrada analógicos: +/- 2 mA (max)

Corriente en los pinos de salida: 2 mA (max)

Rechazo de fuente: 75 dB (min)

CMRRR: 65 dB (min)

Ganancia de señal sin retroalimentación: 95 dB (min)

Alimentación: 1,72 a 5,5 V

Corriente quiescente: 45 uA (tip)

GBWP: 1 MHz

 

    A continuación, seguimos algunos circuitos prácticos de aplicación para este componente.

 

Sensor de Monóxido de Carbono

    Esta aplicación busca detectar la presencia del gas monóxido de carbono (CO) en un ambiente, lo que es extremadamente peligroso para la presencia de humanos.

   Los dispositivos sensores de este gas normalmente son tipos portátiles (alimentados por la batería) emitiendo un sonido audible cuando se detectan niveles peligrosos del gas.

   En la figura 2 tenemos un circuito típico sugerido por Microchip usando el amplificador operacional MCP6411.

 

Figura 2 - detector de monóxido de carbono
Figura 2 - detector de monóxido de carbono

 

 

   El sensor es del tipo convencional utilizado en estas aplicaciones. La finalidad del potenciómetro R1 es hacer la calibración en función del ambiente.

 

Sensor de presión

    En la figura 3 tenemos otra aplicación para el MCP6411. Se trata de un circuito para un sensor de puente de presión.

 

Figura 3 - sensor de presión
Figura 3 - sensor de presión

 

 

En esta aplicación se utilizan, conectados de modo que funcionan como búfer para impedir que se cargue el puente. Los resistores R1, R2, R3 y R5 deben tener tolerancia bastante estrecha para que la CMRR sea alcanzada.

 

Sensor de corriente de batería

La siguiente aplicación para el MCP6411 sugerida por Microchip es un sensor de corriente para la batería, que se muestra en la figura 4.

 

 

Figura 4 - sensor de corriente de batería
Figura 4 - sensor de corriente de batería

 

 

    Como podemos ver, se trata de un circuito high-side (lado positivo o lado alto) que se intercalado entre el positivo de la alimentación (batería) y el circuito alimentado.

    La fórmula junto al diagrama permite calcular la corriente de salida en función de la corriente de entrada.

    En el application note de Microchip encontramos referencia a varias otras aplicaciones de notas con contenido importante para el proyecto con amplificadores operacionales.

 

 

 

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