Amplificador De 22 Bits

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 µVRMS 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 FilterSettling Time, Single-Command Conversions through 3-wire SPI Interface • Ultra-Low Conversion Current (MCP3550/1): - 100 µA typical (VDD = 2.7V) - 120 µA typical (VDD = 5.0V) • Differential Input with VSS to VDD 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 5.5Vlow-power, 22-bit Delta-Sigma Analog-to-Digital Converters (ADCs). The devices offer output noise as low as 2.5 µVRMS, 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 (suchas 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 andare 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 VREF 1 VIN+ 2 VIN– 3 VSS 4 VSS VDD 8 VDD 7 CS 6 SDO/RDY 5 SCK

Block Diagram
VREF

VIN-

Internal Oscillator

© 2009 Microchip TechnologyInc.

SINC 4

VIN+

Serial Interface

3rd-Order DS ADC Modulator w/ Internal Calibration

SCK SDO RDY CS

VDD POR

DS21950E-page 1

MCP3550/1/3
NOTES:

DS21950E-page 2

© 2009 Microchip Technology Inc.

MCP3550/1/3
1.0
1.1

ELECTRICAL CHARACTERISTICS
Maximum Ratings*

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

† 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 deviceat 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.

DC CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, all parameters apply at -40°C ≤ TA ≤ +85°C, VDD = 2.7V or 5.0V. VREF = 2.5V. VIN+ = VIN- = VCM = VREF/2. All ppmunits use 2*VREF as full scale range. Unless otherwise noted, specification applies to entire MCP3550/1/3 family. Parameters Noise Performance (MCP3550/1) No Missing Codes Output Noise Effective Resolution Noise Performance (MCP3553) No Missing Codes Output Noise Effective Resolution Conversion Times MCP3550-50 MCP3550-60 MCP3551 MCP3553 Accuracy Integral Non-Linearity Offset Error INL VOS — -12...