Microchip Technology MCP355XDV-MS1 Data Sheet

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© 2009 Microchip Technology Inc.
DS21950E-page 1
MCP3550/1/3
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
Applications
• Weigh Scales
• Direct Temperature Measurement
• 6-digit DVMs
• Instrumentation
• Data Acquisition
• Strain Gauge Measurement
Block Diagram
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.
Package Types:
V
SS
V
IN
+
V
IN
-
SCK
V
DD
SDO
CS
SINC 
4
Internal
Serial Interface
V
REF
POR
Oscillator 
3rd-Order
DS ADC 
Modulator
w/ Internal 
Calibration
V
DD
RDY
V
IN
V
IN
+
MCP3550/1/3
V
SS
CS
SDO/RDY
1
2
3
4
8
7
6
5 SCK
V
DD
V
REF
MSOP, SOIC 
Low-Power, Single-Channel 22-Bit Delta-Sigma ADCs