PDF MCP3550 Data sheet ( Hoja de datos )

Número de pieza	MCP3550
Descripción	(MCP3550 - MCP3553) Single-Channel 22-Bit Delta-Sigma ADCs
Fabricantes	Microchip
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No Preview Available ! 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 Filter Settling 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 Applications • Weigh Scales • Direct Temperature Measurement • 6-digit DVMs • Instrumentation • Data Acquisition • Strain Gauge Measurement Block Diagram VREF VSS VDD VIN+ VIN- 3rd-Order DS ADC Modulator w/ Internal Calibration Internal Oscillator VDD POR SCK SDO RDY CS 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 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 (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: MCP3550/1/3 MSOP, SOIC VREF 1 VIN+ 2 VIN– 3 VSS 4 8 VDD 7 CS 6 SDO/RDY 5 SCK © 2009 Microchip Technology Inc. DS21950E-page 1 Free Datasheet http://www.0PDF.com 1 page MCP3550/1/3 DC CHARACTERISTICS (CONTINUED) 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 ppm units use 2VREF as full scale range. Unless otherwise noted, specification applies to entire MCP3550/1/3 family. Parameters Sym Min Typ Max Units Conditions Voltage Output Low (SDO/RDY) Input leakage Current (CS, SCK) VOL ILI — — 0.4 -1 — 1 V VOH = -1 mA, VDD = 5.0V µA Internal Pin Capacitance (CS, SCK, SDO/RDY) CINT —5 — pF Note 1 Note 1: 2: 3: 4: 5: 6: This parameter is established by characterization and not 100% tested. INL is the difference between the endpoints line and the measured code at the center of the quantization band. This current is due to the leakage current and the current due to the offset voltage between VIN+ and VIN-. Input impedance is inversely proportional to clock frequency; typical values are for the MCP3550/1 device. VREF = 5V. Characterized by design, but not tested. Rejection performance depends on internal oscillator accuracy; see Section 4.0 “Device Overview” for more informa- tion on oscillator and digital filter design. MCP3550/1 device rejection specifications characterized from 49 to 61 Hz. TEMPERATURE CHARACTERISTICS Electrical Specifications: Unless otherwise indicated Parameters Sym Min Typ Temperature Ranges Specified Temperature Range Operating Temperature Range Thermal Package Resistances Thermal Resistance, 8L-MSOP Thermal Resistance, 8L-SOIC TA TA θJA θJA -40 — -40 — — 211 — 149.5 Max +85 +125 — — Units °C °C °C/W °C/W Conditions SERIAL TIMINGS Electrical Specifications: Unless otherwise indicated, all parameters apply at -40°C ≤ TA ≤ +85°C, VDD = 3.3V or 5.0V, SDO load = 50 pF. Parameters Sym Min Typ Max Units Conditions CLK Frequency fSCK — — 5 MHz CLK High tHI 90 — — ns CLK Low tLO 90 — — ns CLK fall to output data valid tDO 0 — 90 ns CS low to indicate RDY state tRDY 0 — 50 ns CS minimum low time tCSL 50 — — ns RDY flag setup time tSU 20 — — ns CS rise to output disable tDIS 20 — — ns CS disable time tCSD 90 — — ns Power-up to CS LOW tPUCSL — 10 — µs CS High to Shutdown Mode tCSHSD — 10 — µs © 2009 Microchip Technology Inc. DS21950E-page 5 Free Datash 5 Page MCP3550/1/3 Note: Unless otherwise specified, TA = +25°C, VDD = 5V, VREF = 2.5V, VSS = 0V, VCM = VREF/2, VIN+ = VIN-. All ppm units use 2VREF as full scale range. Unless otherwise noted, graphs apply to entire MCP3550/1/3 family. 200 180 160 140 120 100 80 60 40 20 0 2.5 MCP3550-60, MCP3553 MCP3550-50, MCP3550/1 3 3.5 4 4.5 5 5.5 VDD (V) FIGURE 2-25: IDD vs. VDD. 160 140 MCP3550-60, MCP3553 120 MCP3550-50, MCP3550/1 100 80 60 40 20 0 -50 -25 0 25 50 75 Temperature (°C) 100 125 FIGURE 2-26: IDD vs. Temperature. © 2009 Microchip Technology Inc. DS21950E-page 11 Free Datasheet http://www.0PDF.com 11 Page

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