MCP3551

Features:

• 22-bit ADC in Small 8-pin MSOP Package with Automatic Internal Offset and Gain Calibration
• Low-Output Noise of 2.5 V_RMS with Effective Resolution of 21.9 bits (MCP3551)
• 3 V 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 (MCP3551):
- 100A typical (V_DD = 2.7V)
- 120A typical (V_DD = 5.0V)
• Differential Input with VSS to V_DD Common Mode Range
• 2.7V to 5.5V Single-Supply Operation
• Extended Temperature Range:
- -40to +125




Application

• Weigh Scales
• Direct Temperature Measurement
• 6-digit DVMs
• Instrumentation
• Data Acquisition
• Strain Gauge Measurement




Pinout






Specifications

Parameter NameValueTypical Supply Current (A)120Typical INL (ppm)2Max Sample Rate (samples/sec)14Input Type1 Differential InterfaceSPIResolution (bits)22Supply Voltage Range (V)2.7 to 5.5

Parameter Name	Value
Typical Supply Current (A)	120
Typical INL (ppm)	2
Max Sample Rate (samples/sec)	14
Input Type	1 Differential
Interface	SPI
Resolution (bits)	22
Supply Voltage Range (V)	2.7 to 5.5

VDD...................................................................................7.0V
All inputs and outputs w.r.t V_SS ............. 0.3V to V_DD + 0.3V
Difference Input Voltage ....................................... |V_DD - V_SS|
Output Short Circuit Current .................................Continuous
Current at Input Pins ...................................................±2 mA
Current at Output and Supply Pins ............................±10 mA
Storage Temperature......................................-65 to +150
Ambient temp. with power applied .................-55 to +125
ESD protection on all pins (HBM, MM) ............ 6 kV, 400V
Maximum Junction Temperature (T_J) . ..........................+150

† Notice: Stresses above those listed under "Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability.




Description

The Microchip Technology Inc. MCP3551 devices are 2.7V to 5.5V low-power, 22-bit delta-sigma A/D converters. The devices offer output noise as low as 2.5 Vrms with a total unadjusted error of less than 10 ppm. The family exhibits less than 6 ppm integral non-linearity (INL) error, 3 V offset error, and 2 ppm full scale error. The MCP3551 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. The fully differential analog inputs of MCP3551 make it compatible with a wide variety of sensor and measurement applications. The MCP3551 devices operate from -40°C to +125°C and are available in the space-saving 8-pin MSOP and SOIC packages.