MICROCHIP MCP3550, MCP3551, MCP3553 Technical data

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 µV

with Effective

RMS

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

= 2.7V)

DD

-120µA typical (VDD = 5.0V)

• Differential Input with V

to VDD Common Mode

SS

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

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

, with a total

RMS

unadjusted error of 10 ppm. The family exhibits 6ppm 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 co ntrol 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

SOIC, MSOP

V

REF

V VIN–

V

1 2

+

IN

3 4

SS

8

V

DD

CS

7 6

SDO/RDY

5

SCK

V

REF

V

SS

DD

Device Selection Table

VIN+

VIN-

3rd-Order DS ADC Modulator w/ Internal Calibration

Internal

Oscillator

4

SINC

V

DD

POR

SCK SDO

RDY CS

Serial Inte rface

Part Number

MCP3550-50 12.5 sps 21.9 bits 50 Hz MCP3550-60 15 sps 21.9 bits 60 Hz MCP3551 13.75 sps 21.9 bits 50/60 Hz

MCP3553 60 sps 20.6 bits N/A

Sample

Rate

Effective

Resolution

50/60 Hz

Rejection

(simultaneous)

MCP3550/1/3

1.0 ELECTRICAL CHARACTERISTICS

1.1 Maximum Ratings*

VDD...................................................................................7.0V

All inputs and outputs w.r.t V

.............. -0.3V to V

SS

Difference Input Voltage .......................................|V

DD

+ 0.3V

- VSS|

† 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.

Output Short Circuit Current .................................Continuous

Current at Input Pins ....... .. ....... .... .... .. .... ....... .... .. .... .. ...±2 m A

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 ≤ TA ≤ +85°C, VDD = 2.7V or 5.0V.

V

= 2.5V. VIN+ = VIN- = VCM = V

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 Effective Resolution ER — 21.9 — bits RMS V

Noise Performance (MCP3553)

No Missing Codes NMC 20 — — bits At DC (Note 5) Output Noise e Effective Resolution ER — 20.6 — bits RMS V

Conversion Times

MCP3550-50 t MCP3550-60 t MCP3551 t MCP3553 t

Accuracy

Integral Non-Linearity INL — ±2 6 ppm T Offset Error V

Positive Full-Scale Error V Negative Full-Scale Error V Offset Drift — 0.040 — ppm/°C Positive/Negative Full-Scale Error

Drift

Note 1: This parameter is established by characterization and not 100% tested.

2: INL is the difference between the endpoints 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

N

CONV CONV CONV CONV

OS

—2.5— µV

—6—µV

-1.0% 80 +1.0% ms

-1.0% 66.67 +1.0% ms

-1.0% 72.73 +1.0% ms

-1.0% 16.67 +1.0% ms

-12 ±3 +12 µV TA = +25°C —±4— µVT —±6— µVT

FS,P FS,N

-10 ±2 +10 ppm TA = +25°C only

— 0.028 — ppm/°C

as full-scale range. Unless otherwise noted, specification

REF

RMS

= 5V

REF

RMS

= 5V

REF

= +25°C only (Note 2)

A

= +85°C

A

= +125°C

A

+ and VIN-.

IN

REF

=5V.

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.

= 2.5V. VIN+ = VIN- = VCM = V

V

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, VDD varies from

Power Supply 50/60 Hz Rejection PSRR — -120 — dB MCP3550-50 or MCP3550-60 only

Normal Mode 50 and 60 Hz Rejection

Normal Mode 50 or 60 Hz Rejection

Analog Inputs

Differential Input Range V Absolute/Common Mode Voltages V 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

Capacitor Reference Input Impedance — 2.4 — MΩ Note 4 Shutdown Mode Reference

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

Serial Interface

Voltage Input High (CS Voltage Input Low (CS

, SCK) V

Voltage Output High (SDO/RDY

Note 1: This parameter is established by characterization and not 100% tested.

2: INL is the difference between the endpoints 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

as full-scale range. Unless otherwise noted, specification

REF

varies from 0V to V

CM

4.5V to 5.5V

at 50 or 60 Hz respectively, V varies from 4.5V to 5.5V

NMRR — -85 — dB MCP3551 only,

< VDD,

0 < V

CM

< V

-V

REF

IN

= (V

IN

NMRR — -120 — dB MCP3550-50 or MCP3550-60 only

at 50 or 60 Hz respectively,

< VDD,

0 < V

CM

-V

< V

IN

= (V

IN

IN+

− V

IN-

-V

REF

- 0.3 — V

SS

—+V

REF

+ 0.3 V

DD

REF

V

+ = VIN- = VDD; CS = V

IN

(Note 3)

V

DD

—15— pFNote 5

+ = VIN- = VSS; CS = V

IN

= 2.7V

DD

= 2.7V

DD

+ and VIN-.

IN

DD

I

DD

I

DD

DDSL

DDS

IH IL

)VOHV

—1— nAV

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

0.7 V

—— V

DD

——0.4 V

- 0.5 — — V VOH = 1 mA, VDD = 5.0V

DD

+ -VIN-) < +V

DD

=5V.

REF

DD

REF

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.

= 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 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 endpoints 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.

TEMPERATURE CHAR ACTERISTICS

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 θ Thermal Resistance, 8L-SOIC θ

/2. All ppm units use 2*V

REF

)VOL——0.4 VVOH = -1 mA, VDD = 5.0V

I

LI

C

INT

A A

JA JA

-1 — 1 µA

—5— pFNote 1

-40 — +85 °C

-40 — +125 °C

—206—°C/W —163—°C/W

as full-scale range. Unless otherwise noted, specification

REF

+ and VIN-.

IN

REF

=5V.

SERIAL TIMINGS

Electrical Specifications: Unless otherwise indicated, all parameters apply at -40°C ≤ TA ≤ +85°C,

V

= 3.3V or 5.0V, SDO load = 50 pF.

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

LOW t

CSHSD

SCK

HI LO DO

RDY CSL

SU

DIS

CSD

PUCSL

—— 5MHz 90 — — ns 90 — — ns

0 — 90 ns

0 — 50 ns 50 — — ns 20 — — ns 20 — — ns 90 — — ns

—10—µs —10—µs

t

RDY

t

CSD

t

CS

CSL

SDO

/RDY

t

DO

t

SCK

SU

FIGURE 1-1: Serial Timing.

V

DD

t

PUCSL

f

SCK

t

HItLO

MCP3550/1/3

t

CSHSD

t

DIS

CS

FIGURE 1-2: Power-up Timing.

MCP3550/1/3

2.0 TYPICAL PERFORMANCE CURVES

Note: The graphs and ta ble s prov id ed following this n ote are a statistical summ ary based on a l imite d 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, TA = +25°C, VDD = 5V, V All ppm units use 2*V

5 4 3 2 1 0

-1

INL (ppm)

-2

-3

-4

-5

-2.5 -1.5 -0.5 0.5 1.5 2.5

as full-scale range. Unless otherwise noted, graphs apply to entire MC P35 50 /1/3 famil y.

REF

+125 C

+85 C

-40 C

+25 C

V

(V)

IN

FIGURE 2-1: INL Error vs. Input Voltage (V

= 2.7V).

DD

5 4 3 2 1 0

-1

INL (ppm)

-2

-3

-4

-5

-2.5 -1.5 -0.5 0.5 1.5 2.5

+125 C

+85 C

V

- 40 C

+25 C

(V)

IN

= 2.5V, VSS = 0V, VCM = V

REF

10

8

6

4

INL Error (ppm)

2

0

00.511.522.533.544.55

/2, VIN+ = VIN-.

REF

V

(V)

REF

FIGURE 2-4: Maximum INL Error vs. V

.

REF

10

9 8 7 6 5 4 3

Max INL (ppm)

2 1 0

-50 -25 0 25 50 75 100 125 Temperature (°C)

FIGURE 2-2: INL Error vs. Input Voltage

= 5.0V).

(V

DD

10

8 6 4 2 0

-2

INL (ppm)

-4

-6

-8

-10

-5 -4 -3 -2 -1 0 1 2 3 4 5

+125 C +85 C

+25 C

-40 C

V

(V)

IN

FIGURE 2-3: INL Error vs. Input Voltage (V

DD

= 5.0V, V

REF

= 5V).

FIGURE 2-5: Maximum INL Error vs. Temperature.

10

)

9

RMS

8 7 6 5 4 3 2

Output Noise (µV

1 0

-2.5 -1.5 -0.5 0.5 1.5 2.5

MCP3553

MCP3550/1

(Volts)

V

IN

FIGURE 2-6: Output Noise vs. Input Voltage (V

= 2.7V).

DD

MCP3550/1/3

MCP3550/1

Note: Unless otherwise specified, TA = +25°C, VDD = 5V, V

All ppm units use 2*V

15

)

RMS

10

5

Output Noise (µV

0

-2.5 -1.5 -0.5 0.5 1.5 2.5

as full-scale range. Unless otherwise noted, graphs apply to entire MCP3550/1/3 family.

REF

MCP3553

MCP3550/1

V

(V)

IN

FIGURE 2-7: Output Noise vs. Input Voltage (V

u

10.0

9.0

)

8.0

RMS

7.0

6.0

5.0

4.0

3.0

2.0

Output Noise (µV

1.0

0.0

= 5.0V).

DD

MCP3553

0.0 1.0 2.0 3.0 4.0 5.0 V

(V)

REF

= 2.5V, VSS = 0V, VCM = V

REF

10

9

)

8

RMS

7 6 5 4 3 2

Output Noise (µV

1 0

-50-250 255075100125 Temperature (°C)

/2, VIN+ = VIN-.

REF

MCP3553

FIGURE 2-10: Output Noise vs. Temperature.

5

4

3

2

Offset (µV)

1

0

2.533.544.555.5 (V)

V

DD

MCP3550/1

FIGURE 2-8: Output Noise vs. V

10

)

9 8

RMS

7 6 5 4 3 2

Output Noise (µV

1 0

2.533.544.555.5

MCP3553

V

(V)

DD

FIGURE 2-9: Output Noise vs.V

REF

DD

.

FIGURE 2-11: Offset Error vs V (V

=0V).

CM

7 6 5 4 3

Offset (µV)

2 1 0

-50 -25 0 25 50 75 100 125

Temperature (°C)

FIGURE 2-12: Offset Error vs. Temperature (V

REF

= 5.0V).

DD

MCP3550/1/3

consecutive

16384 consecutive

Note: Unless otherwise specified, TA = +25°C, VDD = 5V, V

All ppm units are ratioed against 2*V

5 4 3 2 1 0

-1

-2

-3

Full-Scale Error (ppm)

-4

-5

2.533.544.555.5

Positive Full-Scale

Negative Full-Scale

V

(V)

DD

Unless otherwise noted, graphs apply to entire MCP3550/1/3 family.

REF .

FIGURE 2-13: Full-Scale Error vs. VDD.

10

8 6 4 2 0

-2

-4

-6

Full-Scale Error (ppm)

-8

-10

-50 -25 0 25 50 75 100 125

Positive Full-Scale

Negative Full -S c a le

Temperature (°C)

= 2.5V, VSS = 0V, VCM = V

REF

4000

V

= 5V

3500 3000 2500 2000 1500

DD

V

= 2.5V

REF

V

= 1.25V

CM

V

= 0V

IN

T

= 25C

A

16384

readings

/2, VIN+ = VIN-.

REF

1000

500

Number of Occurrences

0

-15 -10 -5 0 5 10 15 Output Code (LSB)

FIGURE 2-16: MCP3550/1 Output Noise Histogram.

1800

V

= 5V

DD

1600

V

= 2.5V

REF

V

= 1.25V

CM

1400

V

= 0V

IN

1200

T

= 25°C

A

1000

readings

800 600 400 200

Number of Occurrences

0

-15 -10 -5 0 5 10 15 Output Code (LSB)

FIGURE 2-14: Full-Scale Error vs. Temperature.

10

8 6 4

Positive Full-Scale

2 0

-2

-4

-6

Full-Scale Error (ppm)

-8

Negative Full-Scale

-10

-50 -25 0 25 50 75 100 125 Temperature (°C)

FIGURE 2-15: Full-Scale Error vs. Temperature (V

REF

= 5.0V).

FIGURE 2-17: MCP3553 Output Noise Histogram.

5.0

4.0

3.0

2.0

1.0

0.0

-1.0

TUE (ppm)

-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)

V

IN

FIGURE 2-18: Total Unadjusted Error (TUE) vs. Input Voltage (VDD = 2.7V).

MCP3550/1/3

Note: Unless otherwise specified, TA = +25°C, VDD = 5V, V

All ppm units use 2*V

5 4 3 2 1 0

-1

TUE (ppm)

-2

-3

-4

-5

-2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5

as full-scale range.

REF

(V)

V

IN

Unless otherwise noted, graphs apply to enti re M CP355 0/1/3 family.

FIGURE 2-19: Total Unadjusted Error (TUE) vs. Input Voltage.

10

8 6 4 2 0

-2

TUE (ppm)

-4

-6

-8

-10

-5-4-3-2-1012345 V

(V)

IN

= 2.5V, VSS = 0V, VCM = V

REF

6 5 4 3 2 1

Maximum TUE (ppm)

0

-50 -25 0 25 50 75 100 125 Temperature (°C)

/2, VIN+ = VIN-.

REF

FIGURE 2-22: Maximum TUE vs. Temperature.

5

4.5 4

3.5 3

2.5 2

TUE (ppm)

1.5 1

0.5 0

2.5 2.7 3 3.3 4 5 5.5 V

(V)

DD

FIGURE 2-20: Total Unadjusted Error (TUE) vs. Input Voltage (V

10

9 8 7 6 5 4 3 2

Maximum TUE (ppm)

1 0

012345

FIGURE 2-21: Maximum TUE vs. V

V

REF

(V)

= 5.0V).

REF

FIGURE 2-23: Maximum TUE vs. V

0.6

0.5

0.4

0.3

(µA)

0.2

DDS

I

0.1 0

-0.1

-50-25 0 255075100125

.

FIGURE 2-24: I

MCP3550/1

MCP3553

Temperatur e ( °C)

vs. Temperature.

DDS

DD

.