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MCP3425A0TECH

Description
16-Bit Analog-to-Digital Converter with I2C Interface and On-Board Reference
File Size308KB,30 Pages
ManufacturerMicrochip
Websitehttps://www.microchip.com
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MCP3425A0TECH Overview

16-Bit Analog-to-Digital Converter with I2C Interface and On-Board Reference

MCP3425
16-Bit Analog-to-Digital Converter
with I
2
C Interface and On-Board Reference
Features
• 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
Description
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 conversion
modes: (a) Continuous mode and (b) One-Shot mode.
In One-Shot mode, the device enters a low current
standby mode automatically after one conversion. This
reduces current consumption greatly during idle peri-
ods.
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.
Block Diagram
V
SS
V
DD
Typical Applications
• Portable Instrumentation
• Weigh Scales and Fuel Gauges
• Temperature Sensing with RTD, Thermistor, and
Thermocouple
• Bridge Sensing for Pressure, Strain, and Force.
Voltage Reference
(2.048V)
Gain = 1, 2, 4, or 8
V
IN
+
PGA
Top View
V
IN
-
ΔΣ
ADC
Converter
Clock
Oscillator
V
REF
Package Types
SOT-23-6
V
IN
+
V
SS
SCL
1
2
3
6
5
4
V
IN
-
V
DD
SDA
I
2
C Interface
SCL
SDA
©
2007 Microchip Technology Inc.
DS22072A-page 1

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