MCP3425_09 Datasheet, PDF (1/38 Pages) Microchip Technology – 16-Bit Analog-to-Digital Converter with I2C Interface and On-Board Reference

MCP3425
16-Bit Analog-to-Digital Converter
with I²C 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 I²C Serial Interface:
- Standard, Fast and High-Speed Modes
• Single Supply Operation: 2.7V to 5.5V
• Extended Temperature Range: -40°C to 125°C
Typical Applications
• Portable Instrumentation
• Weigh Scales and Fuel Gauges
• Temperature Sensing with RTD, Thermistor, and
Thermocouple
• Bridge Sensing for Pressure, Strain, and Force.
Package Types
SOT-23-6
MCP3425
V_IN+ ₁
V_SS 2
SCL 3
6 V_IN-
5 V_DD
4 SDA
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 I²C
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 I²C 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.
Block Diagram
V_SS
V_DD
Voltage Reference
(2.048V)
Gain = 1, 2, 4, or 8
V_REF
V_IN+
PGA
ΔΣ ADC
Converter
Clock
Oscillator
V_IN-
I²C Interface
SCL
SDA
© 2009 Microchip Technology Inc.
DS22072B-page 1