MCP3550/1/3
Low-Power, Single-Channel 22-Bit Delta-Sigma ADCs
Features
• 22-bit ADC in Small 8-pin MSOP Package with
Automatic Internal Offset and Gain Calibration
• Low-Output Noise of 2.5 µV
RMS
with Effective
Resolution of 21.9 bits (MCP3550/1)
• 3 µV Typical Offset Error
• 2 ppm Typical Full Scale Error
• 6 ppm Maximum INL Error
• Total Unadjusted Error Less Than 10 ppm
• No Digital Filter Settling Time, Single-Command
Conversions through 3-wire SPI Interface
• Ultra-Low Conversion Current (MCP3550/1):
- 100 µA typical (V
DD
= 2.7V)
- 120 µA typical (V
DD
= 5.0V)
• Differential Input with V
SS
to V
DD
Common Mode
Range
• 2.7V to 5.5V Single-Supply Operation
• Extended Temperature Range:
- -40°C to +125°C
Description
The Microchip Technology Inc. MCP3550/1/3 devices
are 2.7V to 5.5V low-power, 22-bit Delta-Sigma
Analog-to-Digital Converters
(ADCs).
The devices offer
output noise as low as 2.5 µV
RMS
, with a total
unadjusted error of 10 ppm. The family exhibits 6 ppm
Integral Non-Linearity (INL) error, 3 µV offset error and
less than 2 ppm full scale error. The MCP3550/1/3
devices provide high accuracy and low noise
performance
for
applications
where
sensor
measurements (such as pressure, temperature and
humidity) are performed. With the internal oscillator
and high oversampling rate, minimal external
components
are
required
for
high-accuracy
applications.
This product line has fully differential analog inputs,
making it compatible with a wide variety of sensor,
industrial control or process control applications.
The MCP3550/1/3 devices operate from -40°C to
+125°C and are available in the space-saving 8-pin
MSOP and SOIC packages.
Applications
•
•
•
•
•
•
Weigh Scales
Direct Temperature Measurement
6-digit DVMs
Instrumentation
Data Acquisition
Strain Gauge Measurement
Package Types:
MCP3550/1/3
MSOP, SOIC
V
REF
1
V
IN
+ 2
V
IN
– 3
V
SS
4
V
SS
V
DD
8 V
DD
7 CS
6 SDO/RDY
5 SCK
Block Diagram
V
REF
V
IN
-
Internal
Oscillator
©
2009 Microchip Technology Inc.
SINC
4
V
IN
+
Serial Interface
3rd-Order
DS ADC
Modulator
w/ Internal
Calibration
SCK
SDO
RDY
CS
V
DD
POR
DS21950E-page 1
MICROCHIP [ MICROCHIP TECHNOLOGY ]
