The MCP3424 is a low noise, high accuracy
delta-sigma analog-to-digital (ΔΣ A/D) converter with 4
differential input channels and up to 18 bits of resolution.
The on-board 2.048V reference voltage enables
an input range of ± 2.048V differentially (full-scale
range = 4.096V/PGA). The MCP3424 is a family
member of the MCP342X series from Microchip Technology
Inc.
The device can output analog-to-digital conversion
results at rates of 3.75, 15, 60, or 240 samples per
second depending on the user controllable configuration
bit settings using the two-wire I2C serial interface.
During each conversion, the device calibrates offset
and gain errors automatically. This provides accurate
conversion results from conversion to conversion over
variations in temperature and power supply fluctuation.
The user can select the PGA gain of x1, x2, x4, or x8
before the analog-to-digital conversion takes place.
This allows the MCP3424 device to convert a very
weak input signal with high resolution.
The MCP3424 device has two conversion modes: (a)
One-Shot Conversion mode and (b) Continuous Conversion
mode. In One-Shot conversion mode, the
device performs a single conversion and enters a low
current standby mode automatically until it receives
another conversion command. This reduces current
consumption greatly during idle periods. In continuous
conversion mode, the conversion takes place
continuously at the set conversion speed. The device
updates its output buffer with the most recent conversion
data.
The device has two external I2C address selection pins
(Adr0 and Adr1). The user can configure the device to
one of eight available addresses by connecting these
two address selection pins to VDD, VSS or float.
The MCP3424 device operates from a single 2.7V to
5.5V power supply and has a two-wire I2C compatible
serial interface for a standard (100 kHz), fast
(400 kHz), or high-speed (3.4 MHz) mode.
The MCP3424 device is available in 14-pin SOIC and
TSSOP packages.