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MCP3551/3
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 (MCP3551)
• 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 SPIInterface
• Ultra-Low Conversion Current (MCP3551):
- 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
ΔΣ ADC
Modulator
w/ Internal
Calibration
Internal
Oscillator
VDD
POR
SCK
SDO
RDY
CS
Description
The Microchip Technology Inc. MCP3551/3 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 MCP3551/3
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 MCP3551/3 devices operate from -40°C to +125°C
and are available in the space-saving 8-pin MSOP and
SOIC packages.
Package Types:
MCP3551/3
SOIC, MSOP
VREF 1
VIN+ 2
VIN– 3
VSS 4
8 VDD
7 CS
6 SDO/RDY
5 SCK
Device Selection Table
Part
Number
Sample
Rate
Effective
Resolution
MCP3551 13.75 sps
21.9 bits
MCP3553
60 sps
20.6 bits
50/60 Hz
Rejection
50/60 Hz
(simultaneous)
N/A
© 2005 Microchip Technology Inc.
DS21950B-page 1

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MCP3551/3
1.0 ELECTRICAL
CHARACTERISTICS
1.1 Maximum Ratings*
VDD...................................................................................7.0V
All inputs and 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 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.
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 ppm units use 2*VREF as full-scale range. Unless otherwise noted, specification
applies to entire MCP3551/3 family.
Parameters
Sym
Min Typ Max
Units
Conditions
Noise Performance (MCP3551)
No Missing Codes
NMC
22 —
bits At DC (Note 5)
Output Noise
Effective Resolution
Noise Performance (MCP3553)
eN
ER
— 2.5 — µVRMS
— 21.9 — bits RMS VREF = 5V
No Missing Codes
NMC
20 —
bits At DC (Note 5)
Output Noise
Effective Resolution
Conversion Times
eN — 6 — µVRMS
ER — 20.6 — bits RMS VREF = 5V
MCP3551
MCP3553
Accuracy
tCONV
tCONV
-0.5%
-0.5%
72.73
16.67
+0.5%
+0.5%
ms
ms
Integral Non-Linearity
Offset Error
Positive Full-Scale Error
Negative Full-Scale Error
Offset Drift
INL
VOS
VFS,P
VFS,N
— ±2
6
-12 ±3 +12
— ±4 —
— ±6 —
-10 ±2 +10
-10 ±2 +10
— 0.040 —
ppm
µV
µV
µV
ppm
ppm
ppm/°C
TA = +25°C only (Note 2)
TA = +25°C
TA = +85°C
TA = +125°C
TA = +25°C only
TA = +25°C only
Positive/Negative Full-Scale Error
Drift
— 0.028 —
ppm/°C
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 MCP3551 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. MCP3551 device rejection specifications characterized from 49 to 61 Hz.
DS21950B-page 2
© 2005 Microchip Technology Inc.

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MCP3551/3
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 2*VREF as full-scale range. Unless otherwise noted, specification
applies to entire MCP3551/3 family.
Parameters
Rejection Performance(1,6)
Common Mode DC Rejection
Power Supply DC Rejection
Common Mode 50/60 Hz Rejection
Power Supply 50/60 Hz Rejection
Sym
CMRR
PSRR
Min Typ Max
— -135 —
— -115 —
— -135 —
— -85 —
Units
Conditions
dB VCM range from 0 to VDD
dB
dB VCM varies from 0V to VDD
dB VDD varies from 4.5V to 5.5V
Normal Mode 50 or 60 Hz
Rejection
Analog Inputs
NMRR
— -85
dB MCP3551 only,
0 < VCM < VDD,
-VREF < VIN = (VIN + -VIN-) <
+VREF
Differential Input Range
VIN+ VIN- -VREF — +VREF
V
Absolute/Common Mode Voltages
VSS - 0.3 — VDD + 0.3
V
Analog Input Sampling Capacitor
— 10 —
pF Note 5
Differential Input Impedance
— 2.4 —
MΩ
Shutdown Mode Leakage Current
—1 —
nA VIN+ = VIN- = VDD; CS = VDD
(Note 3)
Reference Input
Voltage Range
Reference Input Sampling
Capacitor
0.1 — VDD
— 15 —
V
pF Note 5
Reference Input Impedance
— 2.4 —
MΩ Note 4
Shutdown Mode Reference
Leakage Current
—1 —
nA VIN+ = VIN- = VSS; CS = VDD
Power Requirements
Power Supply Voltage Range
MCP3551 Supply Current
MCP3553 Supply Current
Supply Current, Sleep Mode
Supply Current, Shutdown Mode
Serial Interface
VDD
IDD
IDD
IDDSL
IDDS
2.7 — 5.5
— 120 170
— 100 —
— 140 185
— 120 —
— 10
——
1
V
µA VDD = 5V
µA VDD = 2.7V
µA VDD = 5V
µA VDD = 2.7V
µA
µA CS = SCK = VDD
Voltage Input High (CS, SCK)
Voltage Input Low (CS, SCK)
Voltage Output High (SDO/RDY)
Voltage Output Low (SDO/RDY)
Input leakage Current
(CS, SCK)
VIH
VIL
VOH
VOL
ILI
0.7 VDD
VDD - 0.5
-1
0.4
0.4
1
V
V
V VOH = 1 mA, VDD = 5.0V
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 MCP3551 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. MCP3551 device rejection specifications characterized from 49 to 61 Hz.
© 2005 Microchip Technology Inc.
DS21950B-page 3

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MCP3551/3
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 —
— 206
— 163
Max Units
+85
+125
°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
t PUCSL
10
µs
CS High to Shutdown Mode
tCSHSD
10
µs
DS21950B-page 4
© 2005 Microchip Technology Inc.

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tRDY
tCSD
CS tCSL
SDO
/RDY
SCK
tDO
tSU
fSCK
tHI tLO
FIGURE 1-1:
Serial Timing.
VDD
CS
tPUCSL
FIGURE 1-2:
Power-up Timing.
MCP3551/3
tCSHSD
tDIS
© 2005 Microchip Technology Inc.
DS21950B-page 5