MCP3550/1/3
V
SS
VIN+
VIN-
SCK
V
DD
SDO
CS
SINC
4
Internal
Serial Interface
V
REF
POR
Oscillator
3rd-Order
DS ADC
Modulator
w/ Internal
Calibration
V
DD
RDY
VIN–
V
IN
+
MCP3550/1/3
V
SS
CS
SDO/RDY
1
2
3
4
8
7
6
5
SCK
V
DD
V
REF
MSOP, SOIC
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 µV
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):
-100µA Typical (V
-120µA Typical (VDD = 5.0V)
• Differential Input with V
Range
• 2.7V to 5.5V Single-Supply Operation
• Extended Temperature Range:
- -40°C to +125°C
= 2.7V)
DD
SS
with Effective
RMS
to VDD Common Mode
Applications:
• Weigh Scales
• Direct Temperature Measurement
• 6-digit DVMs
• Instrumentation
• Data Acquisition
• Strain Gauge Measurement
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 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 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.
, with a total
RMS
Package Types
Block Diagram
2005-2014 Microchip Technology Inc. DS20001950F-page 1
MCP3550/1/3
NOTES:
DS20001950F-page 2 2005-2014 Microchip Technology Inc.
MCP3550/1/3
1.0 ELECTRICAL
CHARACTERISTICS
† Notice: Stresses above those listed under "Absolute
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 indi-
Absolute Maximum Ratings †
cated in the operation listings of this specification is not
implied. Exposure to maximum rating conditions for extended
VDD...................................................................................7.0V
All inputs and outputs w.r.t V
Difference Input Voltage ....................................... |V
.... .......... -0.3V to VDD+ 0.3V
SS
DD
- VSS|
periods may affect device reliability.
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) 6kV, 400V
Maximum Junction Temperature (T
)..........................+150°C
J
DC CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, all parameters apply at -40°C T
V
= 2.5V. VIN+ = VIN- = VCM = V
REF
/2. All ppm units use 2*V
REF
as full scale range. Unless otherwise noted, specification
REF
applies to entire MCP3550/1/3 family.
Parameters Sym. Min. Typ. Max. Units Conditions
Noise Performance (MCP3550/1)
No Missing Codes NMC 22 — — bits At DC (Note 5)
Output Noise e
N
—2.5— µV
Effective Resolution ER — 21.9 — bits RMS V
Noise Performance (MCP3553)
No Missing Codes NMC 20 — — bits At DC (Note 5)
Output Noise e
N
—6—µV
Effective Resolution ER — 20.6 — bits RMS V
Conversion Times
MCP3550-50 t
MCP3550-60 t
MCP3551 t
MCP3553 t
CONV
CONV
CONV
CONV
-2.0% 80 +2.0% ms
-2.0% 66.67 +2.0% ms
-2.0% 73.1 +2.0% ms
-2.0% 16.67 +2.0% ms
Accuracy
Integral Non-Linearity INL — ±2 6 ppm T
Offset Error V
OS
-12 ±3 +12 µV TA = +25°C
—±4— µVT
—±6— µVT
Positive Full-Scale Error V
Negative Full-Scale Error V
FS,P
FS,N
-10 ±2 +10 ppm TA = +25°C only
-10 ±2 +10 ppm TA = +25°C only
Offset Drift — 0.040 — ppm/°C
Positive/Negative Full-Scale Error
— 0.028 — ppm/°C
Drift
Note 1: This parameter is established by characterization and not 100% tested.
2: INL is the difference between the endpoint’s line and the measured code at the center of the quantization band.
3: This current is due to the leakage current and the current due to the offset voltage between V
4: Input impedance is inversely proportional to clock frequency; typical values are for the MCP3550/1 device. V
5: 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 49 to 61 Hz.
+85°C, VDD = 2.7V or 5.0V.
A
RMS
= 5V
REF
RMS
= 5V
REF
= +25°C only (Note 2)
A
= +85°C
A
= +125°C
A
+ and VIN-.
IN
REF
=5V.
2005-2014 Microchip Technology Inc. DS20001950F-page 3
MCP3550/1/3
DC CHARACTERISTICS (CONTINUED)
Electrical Specifications: Unless otherwise indicated, all parameters apply at -40°C T
= 2.5V. VIN+ = VIN- = VCM = V
V
REF
/2. All ppm units use 2*V
REF
as full scale range. Unless otherwise noted, specification
REF
applies to entire MCP3550/1/3 family.
Parameters Sym. Min. Typ. Max. Units Conditions
Rejection Performance
(1,6)
Common Mode DC Rejection — -135 — dB VCM range from 0 to V
Power Supply DC Rejection — -115 — dB
Common Mode 50/60 Hz Rejection CMRR — -135 — dB V
Power Supply 50/60 Hz Rejection PSRR — -85 — dB MCP3551 only, V
Power Supply 50/60 Hz Rejection PSRR — -120 — dB MCP3550-50 or MCP3550-60 only
Normal Mode 50 and 60 Hz
NMRR — -85 — dB MCP3551 only,
Rejection
Normal Mode 50 or 60 Hz
NMRR — -120 — dB MCP3550-50 or MCP3550-60 only
Rejection
Analog Inputs
Differential Input Range V
IN+
V
Absolute/Common Mode Voltages V
IN-
-V
REF
- 0.3 — V
SS
—+V
REF
+ 0.3 V
DD
Analog Input Sampling Capacitor — 10 — pF Note 5
Differential Input Impedance — 2.4 — MΩ
Shutdown Mode Leakage Current — 1 — nA V
Reference Input
Voltage Range 0.1 — V
Reference Input Sampling
—15— pFNote 5
V
DD
Capacitor
Reference Input Impedance — 2.4 — MΩ Note 4
Shutdown Mode Reference
—1— nAV
Leakage Current
Power Requirements
Power Supply Voltage Range V
MCP3550-50, MCP3551 Supply
Current
MCP3550-60, MCP3553 Supply
Current
Supply Current, Sleep Mode I
Supply Current, Shutdown Mode I
DD
I
DD
I
DD
DDSL
DDS
2.7 — 5.5 V
— 120 170 µA VDD = 5V
— 100 — µA V
— 140 185 µA VDD = 5V
— 120 — µA V
—10 µA
—— 1 µACS = SCK = V
Serial Interface
Voltage Input High (CS
Voltage Input Low (CS
Voltage Output High (SDO/RDY
, SCK) V
, SCK) V
)VOHV
IH
IL
0.7 V
——0.4 V
- 0.5 — — V VOH = 1 mA, VDD = 5.0V
DD
—— V
DD
Note 1: This parameter is established by characterization and not 100% tested.
2: INL is the difference between the endpoint’s line and the measured code at the center of the quantization band.
3: This current is due to the leakage current and the current due to the offset voltage between V
4: Input impedance is inversely proportional to clock frequency; typical values are for the MCP3550/1 device. V
5: 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 49 to 61 Hz.
+85°C, VDD = 2.7V or 5.0V.
A
varies from 0V to V
CM
4.5V to 5.5V
DD
at 50 or 60 Hz respectively, V
varies from 4.5V to 5.5V
< VDD,
0 < V
CM
< V
-V
REF
IN
= (V
IN
at 50 or 60 Hz respectively,
< VDD,
0 < V
CM
-V
< V
IN
= (V
IN
REF
V
+ = VIN- = VDD; CS = V
IN
(Note 3)
+ = VIN- = VSS; CS = V
IN
= 2.7V
DD
= 2.7V
DD
DD
+ and VIN-.
IN
DD
DD
varies from
+ -VIN-) < +V
+ -VIN-) < +V
DD
DD
=5V.
REF
DD
REF
REF
DS20001950F-page 4 2005-2014 Microchip Technology Inc.
MCP3550/1/3
DC CHARACTERISTICS (CONTINUED)
Electrical Specifications: Unless otherwise indicated, all parameters apply at -40°C T
= 2.5V. VIN+ = VIN- = VCM = V
V
REF
applies to entire MCP3550/1/3 family.
Parameters Sym. Min. Typ. Max. Units Conditions
Voltage Output Low (SDO/RDY)VOL——0.4 VVOH = -1 mA, VDD = 5.0V
Input leakage Current
, SCK)
(CS
Internal Pin Capacitance
, SCK, SDO/RDY)
(CS
Note 1: This parameter is established by characterization and not 100% tested.
2: INL is the difference between the endpoint’s line and the measured code at the center of the quantization band.
3: This current is due to the leakage current and the current due to the offset voltage between V
4: Input impedance is inversely proportional to clock frequency; typical values are for the MCP3550/1 device. V
5: 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 49 to 61 Hz.
/2. All ppm units use 2*V
REF
I
LI
C
INT
-1 — 1 µA
—5— pFNote 1
as full scale range. Unless otherwise noted, specification
REF
TEMPERATURE CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated
Parameters Sym. Min. Typ. Max. Units Conditions
Temperature Ranges
Specified Temperature Range T
Operating Temperature Range T
Thermal Package Resistances
Thermal Resistance, 8L-MSOP
Thermal Resistance, 8L-SOIC
A
A
JA
JA
-40 — +85 °C
-40 — +125 °C
—211—°C/W
—149.5—°C/W
+85°C, VDD = 2.7V or 5.0V.
A
+ and VIN-.
IN
REF
=5V.
SERIAL TIMINGS
Electrical Specifications: Unless otherwise indicated, all parameters apply at -40°C T
= 3.3V or 5.0V, SDO load = 50 pF.
V
DD
Parameters Sym. Min. Typ. Max. Units Conditions
CLK Frequency f
CLK High t
CLK Low t
CLK fall to output data valid t
low to indicate RDY state t
CS
minimum low time t
CS
flag setup time t
RDY
rise to output disable t
CS
disable time t
CS
Power-up to CS
High to Shutdown Mode t
CS
Note: This parameter is established by characterization and not 100% tested.
LOW t
SCK
HI
LO
DO
RDY
CSL
SU
DIS
CSD
PUCSL
CSHSD
—— 5MHz
90 — — ns
90 — — ns
0 — 90 ns
0 — 50 ns
8——µsNote
20 — — ns
20 — — ns
90 — — ns
—10—µs
—10—µs
+85°C,
A
2005-2014 Microchip Technology Inc. DS20001950F-page 5
MCP3550/1/3
t
RDY
t
CSL
t
DO
t
SU
f
SCK
t
HItLO
t
DIS
CS
SDO
SCK
t
CSD
t
CSHSD
/RDY
V
DD
CS
t
PUCSL
FIGURE 1-1: Serial Timing.
FIGURE 1-2: Power-Up Timing.
DS20001950F-page 6 2005-2014 Microchip Technology Inc.
MCP3550/1/3
-5
-4
-3
-2
-1
0
1
2
3
4
5
-2.5 -1.5 -0.5 0.5 1.5 2.5
V
IN
(V)
INL (ppm)
+125 C
+85 C
-40 C
+25 C
-5
-4
-3
-2
-1
0
1
2
3
4
5
-2.5 -1.5 -0.5 0.5 1.5 2.5
V
IN
(V)
INL (ppm )
+125 C
+85 C
+25 C
- 40 C
-10
-8
-6
-4
-2
0
2
4
6
8
10
-5 -4 -3 -2 -1 0 1 2 3 4 5
V
IN
(V)
INL (ppm )
+125 C
+85 C
+25 C
-40 C
0
2
4
6
8
10
00.511.522.533.544.55
V
REF
(V)
INL Error (ppm)
0
1
2
3
4
5
6
7
8
9
10
-50 -25 0 25 50 75 100 125
Temperature (°C)
Max INL (ppm)
0
1
2
3
4
5
6
7
8
9
10
-2.5 -1.5 -0.5 0.5 1.5 2.5
V
IN
(Vo l ts)
Output Noise (µV
RMS
)
MCP3553
MCP3550/1
2.0 TYPICAL PERFORMANCE CURVES
Note: The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. 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, T
All ppm units use 2*V
as full scale range. Unless otherwise noted, graphs apply to entire MCP3550/1/3 family.
REF
= +25°C, VDD = 5V, V
A
FIGURE 2-1: INL Error vs. Input Voltage
(V
= 2.7V).
DD
= 2.5V, VSS = 0V, VCM = V
REF
/2, VIN+ = VIN-.
REF
FIGURE 2-4: Maximum INL Error vs.
V
.
REF
FIGURE 2-2: INL Error vs. Input Voltage
= 5.0V).
(V
DD
FIGURE 2-3: INL Error vs. Input Voltage
(V
DD
= 5.0V, V
REF
= 5V).
2005-2014 Microchip Technology Inc. DS20001950F-page 7
FIGURE 2-5: Maximum INL Error vs. Temperature.
FIGURE 2-6: Output Noise vs. Input
Voltage (V
= 2.7V).
DD
MCP3550/1/3
0
5
10
15
-2.5 -1.5 -0.5 0.5 1.5 2.5
V
IN
(V)
Output Noise (µV
RMS
)
MCP3553
MCP3550/1
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
0.01.02.03.04.05.0
V
REF
(V)
Output Noise (µV
RMS
)
0
1
2
3
4
5
6
7
8
9
10
2.5 3 3.5 4 4.5 5 5.5
V
DD
(V)
Output Noise (µV
RMS
)
0
1
2
3
4
5
6
7
8
9
10
-50-250 255075100125
Temperature (°C)
Output Noise (µV
RMS
)
MCP3550/1
MCP3553
0
1
2
3
4
5
2.533.544.555.5
V
DD
(V)
Offset (µV)
0
1
2
3
4
5
6
7
-50 -25 0 25 50 75 100 125
Temperature (°C)
Offset (µV)
Note: Unless otherwise specified, T
All ppm units use 2*V
as full scale range. Unless otherwise noted, graphs apply to entire MCP3550/1/3 family.
REF
= +25°C, VDD = 5V, V
A
FIGURE 2-7: Output Noise vs. Input
Voltage (V
u
= 5.0V).
DD
MCP3553
MCP3550/1
= 2.5V, VSS = 0V, VCM = V
REF
/2, VIN+ = VIN-.
REF
FIGURE 2-10: Output Noise vs. Temperature.
FIGURE 2-8: Output Noise vs. V
MCP3553
MCP3550/1
FIGURE 2-9: Output Noise vs.V
DS20001950F-page 8 2005-2014 Microchip Technology Inc.
REF
DD
.
.
FIGURE 2-11: Offset Error vs V
(V
=0V).
CM
FIGURE 2-12: Offset Error vs.
Temperature (V
REF
= 5.0V).
DD
MCP3550/1/3
-5
-4
-3
-2
-1
0
1
2
3
4
5
2.533.544.555.5
V
DD
(V)
Full Scale Error (ppm)
Posit ive Full Scal e
Negative Full Scale
-10
-8
-6
-4
-2
0
2
4
6
8
10
-50 -25 0 25 50 75 100 125
Temperature (°C)
Full Scale Error (ppm)
Positive Full Scale
Negative Full Scale
-10
-8
-6
-4
-2
0
2
4
6
8
10
-50 -25 0 2 5 50 75 100 125
Temperature (°C)
Full Scale Error (ppm)
Posi tive Full Sca le
Negative Full Scale
0
500
1000
1500
2000
2500
3000
3500
4000
VDD= 5V
V
REF
= 2.5V
V
CM
= 1.25V
V
IN
= 0V
T
A
= 25C
16384
consecutive
readings
0
200
400
600
800
1000
1200
1400
1600
1800
-15 -10 -5 0 5 10 15
Output Code (LSB)
Number of O cc ur r ences
V
DD
= 5V
V
REF
= 2.5V
V
CM
= 1.25V
V
IN
= 0V
T
A
= 25°C
16384
consecutive
-5.0
-4.0
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
4.0
5.0
-2.5 -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5
V
IN
(V)
TUE (ppm)
Note: Unless otherwise specified, T
All ppm units are ratioed against 2*V
= +25°C, VDD = 5V, V
A
Unless otherwise noted, graphs apply to entire MCP3550/1/3 family.
REF .
FIGURE 2-13: Full Scale Error vs. VDD.
= 2.5V, VSS = 0V, VCM = V
REF
/2, VIN+ = VIN-.
REF
Number of Occurrences
-15 -10 -5 0 5 10 15
Output Code (LSB)
FIGURE 2-16: MCP3550/1 Output Noise Histogram.
readings
FIGURE 2-14: Full Scale Error vs. Temperature.
FIGURE 2-15: Full Scale Error vs.
Temperature (V
2005-2014 Microchip Technology Inc. DS20001950F-page 9
REF
= 5.0V).
FIGURE 2-17: MCP3553 Output Noise Histogram.
FIGURE 2-18: Total Unadjusted Error
(TUE) vs. Input Voltage (V
= 2.7V).
DD
MCP3550/1/3
-5
-4
-3
-2
-1
0
1
2
3
4
5
-2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5
V
IN
(V)
TUE (ppm)
-10
-8
-6
-4
-2
0
2
4
6
8
10
-5 -4 -3 -2 -1 0 1 2 3 4 5
V
IN
(V)
TUE (ppm)
0
1
2
3
4
5
6
7
8
9
10
012345
V
REF
(V)
Maximum TUE (ppm)
0
1
2
3
4
5
6
-50 -25 0 25 50 75 100 125
Temperature (°C)
Maximum TUE (ppm)
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
2.52.733.34 55.5
V
DD
(V)
TUE (ppm)
-0.1
0
0.1
0.2
0.3
0.4
0.5
0.6
-50 -25 0 25 50 75 100 125
Temp erature (°C)
I
DDS
(µA)
MCP3550/1
MCP3553
Note: Unless otherwise specified, T
All ppm units use 2*V
as full scale range.
REF
= +25°C, VDD = 5V, V
A
FIGURE 2-19: Total Unadjusted Error (TUE) vs. Input Voltage.
= 2.5V, VSS = 0V, VCM = V
Unless otherwise noted, graphs apply to entire MCP3550/1/3 family.
REF
/2, VIN+ = VIN-.
REF
FIGURE 2-22: Maximum TUE vs. Temperature.
FIGURE 2-20: Total Unadjusted Error
(TUE) vs. Input Voltage (V
REF
FIGURE 2-21: Maximum TUE vs. V
DS20001950F-page 10 2005-2014 Microchip Technology Inc.
= 5.0V).
REF
FIGURE 2-23: Maximum TUE vs. V
.
FIGURE 2-24: I
vs. Temperature.
DDS
DD
.
MCP3550/1/3
0
20
40
60
80
100
120
140
160
180
200
2.5 3 3.5 4 4.5 5 5.5
V
DD
(V)
I
DD
(µA)
MCP3 550-60, MC P 3 553
MCP355 0-50, MCP 3550/1
0
20
40
60
80
100
120
140
160
-50-250 255075100125
Temper ature (°C )
I
DD
(µA)
MCP355 0-60, MCP3553
MCP3550-50, MCP3550/1
Note: Unless otherwise specified, T
All ppm units use 2*V
as full scale range. Unless otherwise noted, graphs apply to entire MCP3550/1/3 family.
REF
= +25°C, VDD = 5V, V
A
= 2.5V, VSS = 0V, VCM = V
REF
/2, VIN+ = VIN-.
REF
FIGURE 2-25: IDD vs. VDD. FIGURE 2-26: IDD vs. Temperature.
2005-2014 Microchip Technology Inc. DS20001950F-page 11
MCP3550/1/3
NOTES:
DS20001950F-page 12 2005-2014 Microchip Technology Inc.
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