MCP3421_09 Datasheet, PDF (1/42 Pages) Microchip Technology – 18-Bit Analog-to-Digital Converter with I2C Interface and On-Board Reference

MCP3421
18-Bit Analog-to-Digital Converter
with I²C Interface and On-Board Reference
Features
• 18-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%
- Drift: 15 ppm/°C
• 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:
- 3.75 SPS (18 bits)
- 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)
- 39 µA typical
(V_DD= 3V, One-Shot Conversion with 1 SPS)
• 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
MCP3421
V_IN+ ₁
V_SS 2
SCL 3
6 V_IN-
5 V_DD
4 SDA
Description
The MCP3421 is a single channel low-noise, high
accuracy ΔΣ A/D converter with differential inputs and
up to 18 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 MCP3421 device performs conversion at rates of
3.75, 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 MCP3421 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 periods.
The MCP3421 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.
DS22003E-page 1