MCP3550-50-E/SN Microchip Technology, MCP3550-50-E/SN Datasheet

IC, ADC, 22BIT, 12.5SPS, SOIC-8

MCP3550-50-E/SN

Manufacturer Part Number
MCP3550-50-E/SN
Description
IC, ADC, 22BIT, 12.5SPS, SOIC-8
Manufacturer
Microchip Technology
Datasheet

Specifications of MCP3550-50-E/SN

Resolution (bits)
22bit
Sampling Rate
12.5SPS
Input Channel Type
Differential
Data Interface
3-Wire, Serial
Supply Voltage Range - Analog
2.7V To 5.5V
Supply Current
120µA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
• 22-bit ADC in Small 8-pin MSOP Package with
• Low-Output Noise of 2.5 µV
• 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
• Ultra-Low Conversion Current (MCP3550/1):
• Differential Input with V
• 2.7V to 5.5V Single-Supply Operation
• Extended Temperature Range:
Applications
• Weigh Scales
• Direct Temperature Measurement
• 6-digit DVMs
• Instrumentation
• Data Acquisition
• Strain Gauge Measurement
Block Diagram
© 2005 Microchip Technology Inc.
V
Automatic Internal Offset and Gain Calibration
Resolution of 21.9 bits (MCP3550/1)
Conversions through 3-wire SPI Interface
- 100 µA typical (V
- 120 µA typical (V
Range
- -40°C to +125°C
V
IN
IN
+
-
Low-Power, Single-Channel 22-Bit Delta-Sigma ADCs
V
REF
3rd-Order
DS ADC
Modulator
w/ Internal
Calibration
Oscillator
Internal
DD
DD
= 2.7V)
= 5.0V)
SS
to V
RMS
DD
V
POR
V
with Effective
SS
DD
Common Mode
V
DD
SCK
SDO
RDY
CS
MCP3550/1/3
Description
The Microchip Technology Inc. MCP3550/1/3 devices
are 2.7V to 5.5V low-power, 22-bit Delta-Sigma Ana-
log-to-Digital Converters ADCs). The devices offer
output noise as low as 2.5 µV
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
measurements (such as pressure, temperature and
humidity) are performed. With the internal oscillator
and
components
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:
Device Selection Table
MCP3550-50
MCP3550-60
MCP3551
MCP3553
Part Number
high
V
V
V
V
REF
IN
IN
SS
oversampling
+
13.75 sps
12.5 sps
are
Sample
for
1
2
3
4
15 sps
60 sps
MCP3550/1/3
Rate
SOIC, MSOP
applications
required
Resolution
Effective
21.9 bits
21.9 bits
21.9 bits
20.6 bits
rate,
8
7
6
5 SCK
for
V
CS
SDO/RDY
RMS
minimal
DD
DS21950C-page 1
where
, with a total
(simultaneous)
high-accuracy
Rejection
50/60 Hz
50/60 Hz
50 Hz
60 Hz
N/A
external
sensor

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MCP3550-50-E/SN Summary of contents

Page 1

... 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 measurements (such as pressure, temperature and humidity) are performed ...

Page 2

... Characterized by design, but not tested. 6: 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 Hz. DS21950C-page 2 † Notice: Stresses above those listed under "Maximum Ratings" ...

Page 3

... Characterized by design, but not tested. 6: 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 Hz. © 2005 Microchip Technology Inc. as full-scale range. Unless otherwise noted, specification ...

Page 4

... Characterized by design, but not tested. 6: 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 Hz. TEMPERATURE CHARACTERISTICS Electrical Specifications: Unless otherwise indicated Parameters Sym ...

Page 5

... RDY t CSD t CS CSL SDO /RDY SCK SU FIGURE 1-1: Serial Timing FIGURE 1-2: Power-up Timing. © 2005 Microchip Technology Inc. f SCK PUCSL MCP3550/1/3 t CSHSD t DIS DS21950C-page 5 ...

Page 6

... In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range. Note: Unless otherwise specified +25° All ppm units use 2*V as full-scale range. Unless otherwise noted, graphs apply to entire MCP3550/1/3 family. REF 5 4 +125 C 3 ...

Page 7

... Note: Unless otherwise specified +25° All ppm units use 2*V as full-scale range. Unless otherwise noted, graphs apply to entire MCP3550/1/3 family. REF 15 10 MCP3553 5 MCP3550/1 0 -2.5 -1.5 -0.5 0.5 V (V) IN FIGURE 2-7: Output Noise vs. Input Voltage (V = 5.0V 10.0 9.0 8.0 7.0 MCP3553 6 ...

Page 8

... Positive Full-Scale Negative Full-Scale - -10 -50 - Temperature (°C) FIGURE 2-15: Full-Scale Error vs. Temperature (V = 5.0V). REF DS21950C-page 2.5V 0V REF SS Unless otherwise noted, graphs apply to entire MCP3550/1/3 family. 4000 3500 V = 2.5V REF V = 1.25V 3000 2500 T = 25C A 16384 2000 consecutive readings 1500 1000 500 0 - ...

Page 9

... Total Unadjusted Error (TUE) vs. Input Voltage (V = 5.0V). REF (V) REF FIGURE 2-21: Maximum TUE vs. V © 2005 Microchip Technology Inc 2.5V 0V REF SS . Unless otherwise noted, graphs apply to entire MCP3550/1/3 family -50 -25 1.5 2 2.5 FIGURE 2-22: Temperature. 5 4.5 4 3.5 3 2.5 2 1 2.5 FIGURE 2-23: ...

Page 10

... MCP3550/1/3 Note: Unless otherwise specified +25° All ppm units use 2*V as full-scale range. Unless otherwise noted, graphs apply to entire MCP3550/1/3 family. REF 200 180 160 MCP3550-60, MCP3553 140 120 MCP3550-50, MCP3550/1 100 2.5 3 3.5 4 4.5 V (V) DD FIGURE 2-25 DS21950C-page ...

Page 11

... V current return path for both analog and digital circuitry of the MCP3550/1/ analog ground plane is available recommended that this device be tied to the analog ground plane of the Printed Circuit Board (PCB). 3.4 ...

Page 12

... The power supply range for this product family is 2.7V to 5.5V; the temperature range is -40°C to +125°C. The functional block diagram for the MCP3550/1/3 devices is shown in Figure 4-1. A Power-On Reset (POR) monitoring circuit is included to ensure proper power supply voltages during the conversion process. The clock source for the part is internally generated to ± ...

Page 13

... The bit stream output of the mod- ulator is then processed by the digital decimation filter in order to provide a 22-bit output code at a data rate of 12.5 Hz for the MCP3550-50 for the MCP3550- 60, 13.75 Hz for the MCP3551 and 60 Hz for the MCP3553. Since the oversampling ratio is lower with ...

Page 14

... The internal oscillator frequency is 102.4 kHz ±1% for the MCP3550-50, 112.64 kHz ±1% for the MCP3551, and 122.88 kHz ±1% for the MCP3550-60 and MCP3553 devices, across the full power supply voltage and specified temperature ranges ...

Page 15

... The threshold voltage is set at 2.2V, with a tolerance of approximately ±5%. If the supply voltage falls below this threshold, the MCP3550/1/3 devices will be held in a reset condition or in Shutdown mode. When the part is in Shutdown mode, the power consumption is less than 1 µA. The typical hysteresis value is around 200 mV in order to prevent reset during brown-out or other glitches on the power supply ...

Page 16

... Shutdown Mode When not internally converting, the two modes of operation for the MCP3550/1/3 devices are the Shutdown and Sleep modes. During Shutdown mode, all internal analog circuitry, including the POR, is turned off and the device consumes less than 1 µA. When exiting Shutdown mode, the device must require addi- tional time before a conversion can take place ...

Page 17

... SERIAL INTERFACE 5.1 Overview Serial communication between the microcontroller and the MCP3550/1/3 devices is achieved using CS, SCK and SDO/RDY. There are two modes of operation: Single Conversion and Continuous Conversion. CS controls the conversion start. There are 24 bits in the data word: 22 bits of conversion data and two overflow bits ...

Page 18

... CONV settled completely and there is no latency involved with the digital SINC filter of the MCP3550/1/3. The two modes of conversion for the MCP3550/1/3 devices are Single Conversion and Continuous Conversion. In Single Conversion mode, a consecutive conversion will not automatically begin. Instead, after a ...

Page 19

... CONV Hi-Z SDO/RDY FIGURE 5-4: RDY Functionality in Single Conversion Mode. © 2005 Microchip Technology Inc. MCP3550/1/3 5.4 Continuous Conversion Mode , If no rising edge of CS occurs during any given conver- CONV sion per Figure 5-2, a subsequent conversion will take place and the contents of the previous conversion will be overwritten ...

Page 20

... CONTINUOUS CONVERSION OPERATION, (CS TIED PERMANENTLY LOW possible to use only two wires to communicate with the MCP3550/1/3 devices. In this state, the device is always in Continuous Conversion mode, with internal conversions continuously occurring. This mode can be entered by having CS low during power-up or changing low position after power-up low at power- up, the first conversion of the converter is initiated approximately 300 µ ...

Page 21

... SCK from the MCU idles in the High state, while Figure 5-7 shows the similar case of SPI Mode 0,0, where the clock idles in the Low state. The waveforms in the figures are examples of an MCU operating the SPI port in 8-bit mode, and the MCP3550/1/3 devices do not require data in 8-bit groups. CS SCK ...

Page 22

... MCP3550/1/3 6.0 PACKAGING INFORMATION 6.1 Package Marking Information 8-Lead MSOP XXXXXX YWWNNN 8-Lead SOIC (150 mil) XXXXXXXX XXXXYYWW NNN Legend: XX...X Customer-specific information Y Year code (last digit of calendar year) YY Year code (last 2 digits of calendar year) WW Week code (week of January 1 is week ‘01’) ...

Page 23

... L .016 .024 .031 F .037 REF 0° - 8° c .003 .006 .009 B .009 .012 .016 5° - 15° 5° - 15° MCP3550/1/3 A2 MILLIMETERS* MIN NOM MAX 8 0.65 BSC - - 1.10 0.75 0.85 0.95 0.00 - 0.15 4.90 BSC 3.00 BSC 3.00 BSC 0.40 0.60 0.80 0.95 REF 0° ...

Page 24

... MCP3550/1/3 8-Lead Plastic Small Outline (SN) – Narrow, 150 mil Body (SOIC Units Dimension Limits n Number of Pins p Pitch Overall Height A Molded Package Thickness A2 Standoff § A1 Overall Width E Molded Package Width E1 Overall Length D Chamfer Distance h Foot Length L Foot Angle c Lead Thickness Lead Width ...

Page 25

... APPENDIX A: REVISION HISTORY Revision C (December 2005) • Added MCP3550-50, MCP3550-60 references throughout this document. Revision B (October 2005) • Changed LSb refefences to LSB. Revision A (September 2005) • Original Release of this Document. © 2005 Microchip Technology Inc. MCP3550/1/3 DS21950C-page 25 ...

Page 26

... MCP3550/1/3 NOTES: DS21950C-page 26 © 2005 Microchip Technology Inc. ...

Page 27

... Device Temperature Package Range Device: MCP3550-50: Single Channel 22-Bit Delta-Sigma ADC MCP3550T-50: Single Channel 22-Bit Delta-Sigma ADC (Tape and Reel) MCP3550-60: Single Channel 22-Bit Delta-Sigma ADC MCP3550T-60: Single Channel 22-Bit Delta-Sigma ADC (Tape and Reel) MCP3551: Single Channel 22-Bit Delta-Sigma ADC ...

Page 28

... MCP3550/1/3 NOTES: DS21950C-page 28 © 2005 Microchip Technology Inc. ...

Page 29

... PowerMate, PowerTool, Real ICE, rfLAB, rfPICDEM, Select Mode, Smart Serial, SmartTel, Total Endurance, UNI/O, WiperLock and Zena are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. SQTP is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. ...

Page 30

... Fax: 886-3-572-6459 Taiwan - Kaohsiung Tel: 886-7-536-4818 Fax: 886-7-536-4803 Taiwan - Taipei Tel: 886-2-2500-6610 Fax: 886-2-2508-0102 Thailand - Bangkok Tel: 66-2-694-1351 Fax: 66-2-694-1350 © 2005 Microchip Technology Inc. EUROPE Austria - Wels Tel: 43-7242-2244-399 Fax: 43-7242-2244-393 Denmark - Copenhagen Tel: 45-4450-2828 Fax: 45-4485-2829 France - Paris Tel: 33-1-69-53-63-20 ...

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