Microchip Technology MCP3425EV Scheda Tecnica

© 2009 Microchip Technology Inc.

DS22072B-page 1

• 16-bit 

ΔΣ

 

ADC in a SOT-23-6 package

• Differential Input Operation

• Self Calibration of Internal Offset and Gain per 

each conversion

• On-Board Voltage Reference:

- Accuracy: 2.048V ± 0.05%

• On-Board Programmable Gain Amplifier (PGA):

- Gains of 1, 2, 4 or 8 

• On-Board Oscillator

• INL: 10 ppm of FSR (FSR = 4.096V/PGA)

• Programmable Data Rate Options:

- 15 SPS (16 bits)

- 60 SPS (14 bits)

- 240 SPS (12 bits)

• One-Shot or Continuous Conversion Options

• Low Current Consumption: 

- 145 µA typical 

(V

DD

= 3V, Continuous Conversion)

• One-Shot Conversion (1 SPS) with V

DD

 = 3V:

- 9.7 µA typical with 16 bit mode

- 2.4 µA typical with 14 bit mode

- 0.6 µA typical with 12 bit mode

• Supports I

2

C Serial Interface:

- Standard, Fast and High-Speed Modes

• Single Supply Operation: 2.7V to 5.5V

• Extended Temperature Range: -40°C to 125°C

• Portable Instrumentation

• Weigh Scales and Fuel Gauges

• Temperature Sensing with RTD, Thermistor, and 

Thermocouple

• Bridge Sensing for Pressure, Strain, and Force.

The MCP3425 is a single channel low-noise, high
accuracy  

ΔΣ A/D converter with differential inputs and

up to 16 bits of resolution in a small SOT-23-6 package.
The on-board precision 2.048V reference voltage
enables an input range of ±2.048V differentially
(

Δ voltage = 4.096V). The device uses a two-wire I

2

C

compatible serial interface and operates from a single
2.7V to 5.5V power supply.

The MCP3425 device performs conversion at rates of
15, 60, or 240 samples per second (SPS) depending
on the user controllable configuration bit settings using
the two-wire I

2

C serial interface. This device has an

on-board programmable gain amplifier (PGA). The
user can select the PGA gain of x1, x2, x4, or x8 before
the analog-to-digital conversion takes place. This
allows the MCP3425 device to convert a smaller input
signal with high resolution. The device has two conver-
sion modes: (a) Continuous mode and (b) One-Shot
mode. In One-Shot mode, the device enters a low
current standby mode automatically after one conver-
sion. This reduces current consumption greatly during
idle periods.

The MCP3425 device can be used for various high
accuracy analog-to-digital data conversion applications
where design simplicity, low power, and small footprint
are major considerations.

1

2

3

4

5

6

V

IN

+

 V

SS

SCL

V

IN

-

V

DD

SDA

V

SS

V

DD

V

IN

+

V

IN

-

SCL

SDA

Voltage Reference

Clock

(2.048V)

I

2

C Interface

Gain = 1, 2, 4, or 8

V

REF

ΔΣ ADC

Converter

PGA

Oscillator