MCP3550/1/3 Low-Power, Single-Channel 22-Bit Delta-Sigma ADCs

31 Pages·2017·0.44 MB·English

by  Microchip Technology Inc

MCP3550/1/3
Low-Power, Single-Channel 22-Bit Delta-Sigma ADCs
Features Description
• 22-bit ADC in Small 8-pin MSOP Package with The Microchip Technology Inc. MCP3550/1/3 devices
Automatic Internal Offset and Gain Calibration are 2.7V to 5.5V low-power, 22-bit Delta-Sigma Ana-
(cid:129) Low-Output Noise of 2.5µV with Effective log-to-Digital Converters (ADCs). The devices offer
RMS
Resolution of 21.9 bits (MCP3550/1) output noise as low as 2.5µVRMS, with a total
unadjusted error of 10ppm. The family exhibits 6ppm
(cid:129) 3µV Typical Offset Error
Integral Non-Linearity (INL) error, 3µV offset error and
(cid:129) 2ppm Typical Full-Scale Error
less than 2ppm full-scale error. The MCP3550/1/3
(cid:129) 6ppm Maximum INL Error
devices provide high accuracy and low noise
(cid:129) Total Unadjusted Error Less Than 10ppm performance for applications where sensor
(cid:129) No Digital Filter Settling Time, Single-Command measurements (such as pressure, temperature and
Conversions through 3-wire SPI Interface humidity) are performed. With the internal oscillator
(cid:129) Ultra-Low Conversion Current (MCP3550/1): and high oversampling rate, minimal external
components are required for high-accuracy
- 100µA typical (V = 2.7V)
DD applications.
- 120µA typical (V = 5.0V)
DD
This product line has fully differential analog inputs,
(cid:129) Differential Input with V to V Common Mode
SS DD making it compatible with a wide variety of sensor,
Range
industrial control or process control applications.
(cid:129) 2.7V to 5.5V Single-Supply Operation
The MCP3550/1/3 devices operate from -40°C to
(cid:129) Extended Temperature Range:
+125°C and are available in the space-saving 8-pin
- -40°C to +125°C
MSOP and SOIC packages.
Applications
Package Types:
(cid:129) Weigh Scales
MCP3550/1/3
(cid:129) Direct Temperature Measurement
SOIC, MSOP
(cid:129) 6-digit DVMs
(cid:129) Instrumentation VREF 1 8 VDD
(cid:129) Data Acquisition V + 2 7 CS
IN
(cid:129) Strain Gauge Measurement
V – 3 6 SDO/RDY
IN
Block Diagram VSS 4 5 SCK
VREF VSSVDD
Device Selection Table
Sample Effective 50/60Hz
VVININ+- 3DMwCr/aSod Il d-inAbOutrDelraadrCtnteioo arrnl 4SINC al Interface SSRCDDKOY MMPaCCrPPt 33N55u55m00--b56e00r 112R5.5astspepss R22e11s..o99l ubbtiiittossn Re56j00ecHHtizzo n
eri CS MCP3551 13.75sps 21.9 bits 50/60Hz
S
Internal VDD (simultaneous)
Oscillator
MCP3553 60sps 20.6 bits N/A
POR
© 2007 Microchip Technology Inc. DS21950D-page 1
MCP3550/1/3
1.0 ELECTRICAL † Notice: Stresses above those listed under "Maximum
Ratings" may cause permanent damage to the device. This is
CHARACTERISTICS
a stress rating only and functional operation of the device at
those or any other conditions above those indicated in the
1.1 Maximum Ratings*
operation listings of this specification is not implied. Exposure
to maximum rating conditions for extended periods may affect
V ...................................................................................7.0V
DD device reliability.
All inputs and outputs w.r.t V .............. -0.3V to V + 0.3V
SS DD
Difference Input Voltage .......................................|V - V |
DD SS
Output Short Circuit Current .................................Continuous
Current at Input Pins ....................................................±2mA
Current at Output and Supply Pins ............................±10mA
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 ≤ +85°C, V = 2.7V or 5.0V.
A DD
V = 2.5V. V + = V - = V = V /2. All ppm units use 2*V as full-scale range. Unless otherwise noted, specification
REF IN IN CM REF 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 (Note5)
Output Noise e — 2.5 — µV
N RMS
Effective Resolution ER — 21.9 — bits RMS V = 5V
REF
Noise Performance (MCP3553)
No Missing Codes NMC 20 — — bits At DC (Note5)
Output Noise e — 6 — µV
N RMS
Effective Resolution ER — 20.6 — bits RMS V = 5V
REF
Conversion Times
MCP3550-50 t -1.0% 80 +1.0% ms
CONV
MCP3550-60 t -1.0% 66.67 +1.0% ms
CONV
MCP3551 t -1.0% 72.73 +1.0% ms
CONV
MCP3553 t -1.0% 16.67 +1.0% ms
CONV
Accuracy
Integral Non-Linearity INL — ±2 6 ppm T = +25°C only (Note2)
A
Offset Error V -12 ±3 +12 µV T = +25°C
OS A
— ±4 — µV T = +85°C
A
— ±6 — µV T = +125°C
A
Positive Full-Scale Error V -10 ±2 +10 ppm T = +25°C only
FS,P A
Negative Full-Scale Error V -10 ±2 +10 ppm T = +25°C only
FS,N A
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 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 + and V -.
IN IN
4: Input impedance is inversely proportional to clock frequency; typical values are for the MCP3550/1 device. V =5V.
REF
5: Characterized by design, but not tested.
6: Rejection performance depends on internal oscillator accuracy; see Section4.0 “Device Overview” for more informa-
tion on oscillator and digital filter design. MCP3550/1 device rejection specifications characterized from 49 to 61Hz.
DS21950D-page 2 © 2007 Microchip Technology Inc.
MCP3550/1/3
DC CHARACTERISTICS (CONTINUED)
Electrical Specifications: Unless otherwise indicated, all parameters apply at -40°C ≤ T ≤ +85°C, V = 2.7V or 5.0V.
A DD
V = 2.5V. V + = V - = V = V /2. All ppm units use 2*V as full-scale range. Unless otherwise noted, specification
REF IN IN CM REF 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 V range from 0 to V
CM DD
Power Supply DC Rejection — -115 — dB
Common Mode 50/60Hz Rejection CMRR — -135 — dB V varies from 0V to V
CM DD
Power Supply 50/60Hz Rejection PSRR — -85 — dB MCP3551 only, V varies from
DD
4.5V to 5.5V
Power Supply 50/60Hz Rejection PSRR — -120 — dB MCP3550-50 or MCP3550-60 only
at 50 or 60Hz respectively, V
DD
varies from 4.5V to 5.5V
Normal Mode 50 and 60Hz NMRR — -85 — dB MCP3551 only,
Rejection 0 < V < V ,
CM DD
-V < V = (V + -V -) < +V
REF IN IN IN REF
Normal Mode 50 or 60Hz NMRR — -120 — dB MCP3550-50 or MCP3550-60 only
Rejection at 50 or 60Hz respectively,
0 < V < V ,
CM DD
-V < V = (V + -V -) < +V
REF IN IN IN REF
Analog Inputs
Differential Input Range V − V -V — +V V
IN+ IN- REF REF
Absolute/Common Mode Voltages V - 0.3 — V + 0.3 V
SS DD
Analog Input Sampling Capacitor — 10 — pF Note5
Differential Input Impedance — 2.4 — MΩ
Shutdown Mode Leakage Current — 1 — nA V + = V - = V ; CS = V
IN IN DD DD
(Note3)
Reference Input
Voltage Range 0.1 — V V
DD
Reference Input Sampling — 15 — pF Note5
Capacitor
Reference Input Impedance — 2.4 — MΩ Note4
Shutdown Mode Reference — 1 — nA V + = V - = V ; CS = V
IN IN SS DD
Leakage Current
Power Requirements
Power Supply Voltage Range V 2.7 — 5.5 V
DD
MCP3550-50, MCP3551 Supply I — 120 170 µA V = 5V
DD DD
Current — 100 — µA V = 2.7V
DD
MCP3550-60, MCP3553 Supply I — 140 185 µA V = 5V
DD DD
Current — 120 — µA V = 2.7V
DD
Supply Current, Sleep Mode I — 10 µA
DDSL
Supply Current, Shutdown Mode I — — 1 µA CS = SCK = V
DDS DD
Serial Interface
Voltage Input High (CS, SCK) V 0.7V — — V
IH DD
Voltage Input Low (CS, SCK) V — — 0.4 V
IL
Voltage Output High (SDO/RDY) V V - 0.5 — — V V = 1mA, V = 5.0V
OH DD OH DD
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 + and V -.
IN IN
4: Input impedance is inversely proportional to clock frequency; typical values are for the MCP3550/1 device. V =5V.
REF
5: Characterized by design, but not tested.
6: Rejection performance depends on internal oscillator accuracy; see Section4.0 “Device Overview” for more informa-
tion on oscillator and digital filter design. MCP3550/1 device rejection specifications characterized from 49 to 61Hz.
© 2007 Microchip Technology Inc. DS21950D-page 3
MCP3550/1/3
DC CHARACTERISTICS (CONTINUED)
Electrical Specifications: Unless otherwise indicated, all parameters apply at -40°C ≤ T ≤ +85°C, V = 2.7V or 5.0V.
A DD
V = 2.5V. V + = V - = V = V /2. All ppm units use 2*V as full-scale range. Unless otherwise noted, specification
REF IN IN CM REF REF
applies to entire MCP3550/1/3 family.
Parameters Sym Min Typ Max Units Conditions
Voltage Output Low (SDO/RDY) V — — 0.4 V V = -1mA, V = 5.0V
OL OH DD
Input leakage Current I -1 — 1 µA
LI
(CS, SCK)
Internal Pin Capacitance C — 5 — pF Note1
INT
(CS, SCK, 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 + and V -.
IN IN
4: Input impedance is inversely proportional to clock frequency; typical values are for the MCP3550/1 device. V =5V.
REF
5: Characterized by design, but not tested.
6: Rejection performance depends on internal oscillator accuracy; see Section4.0 “Device Overview” for more informa-
tion on oscillator and digital filter design. MCP3550/1 device rejection specifications characterized from 49 to 61Hz.
TEMPERATURE CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated
Parameters Sym Min Typ Max Units Conditions
Temperature Ranges
Specified Temperature Range T -40 — +85 °C
A
Operating Temperature Range T -40 — +125 °C
A
Thermal Package Resistances
Thermal Resistance, 8L-MSOP θ — 206 — °C/W
JA
Thermal Resistance, 8L-SOIC θ — 163 — °C/W
JA
SERIAL TIMINGS
Electrical Specifications: Unless otherwise indicated, all parameters apply at -40°C ≤ T ≤ +85°C,
A
V = 3.3V or 5.0V, SDO load = 50pF.
DD
Parameters Sym Min Typ Max Units Conditions
CLK Frequency f — — 5 MHz
SCK
CLK High t 90 — — ns
HI
CLK Low t 90 — — ns
LO
CLK fall to output data valid t 0 — 90 ns
DO
CS low to indicate RDY state t 0 — 50 ns
RDY
CS minimum low time t 50 — — ns
CSL
RDY flag setup time t 20 — — ns
SU
CS rise to output disable t 20 — — ns
DIS
CS disable time t 90 — — ns
CSD
Power-up to CS LOW t — 10 — µs
PUCSL
CS High to Shutdown Mode t — 10 — µs
CSHSD
DS21950D-page 4 © 2007 Microchip Technology Inc.
MCP3550/1/3
t
RDY
t
CSHSD
t
CSD
CS tCSL
t
DIS
SDO
/RDY
tDO fSCK
t t
HI LO
t
SCK SU
FIGURE 1-1: Serial Timing.
t
V PUCSL
DD
CS
FIGURE 1-2: Power-up Timing.
© 2007 Microchip Technology Inc. DS21950D-page 5
MCP3550/1/3
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 = +25°C, V = 5V, V = 2.5V, V = 0V, V = V /2, V + = V -.
A DD REF SS CM REF IN IN
All ppm units use 2*V as full-scale range.Unless otherwise noted, graphs apply to entire MCP3550/1/3 family.
REF
5 10
4
+125 C
3 8
2 +85 C m)
m) 1 pp 6
NL (pp -10 -40 C Error ( 4
I -2 +25 C NL
-3 I 2
-4
-5 0
-2.5 -1.5 -0.5 0.5 1.5 2.5 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
V (V) V (V)
IN REF
FIGURE 2-1: INL Error vs. Input Voltage FIGURE 2-4: Maximum INL Error vs.
(V = 2.7V). V .
DD REF
5 10
4 +125 C 9
3 +85 C 8
2 m) 7
INL (ppm) --2101 +25 C- 40 C Max INL (pp 3456
-3 2
-4 1
-5 0
-2.5 -1.5 -0.5 0.5 1.5 2.5 -50 -25 0 25 50 75 100 125
VIN (V) Temperature (°C)
FIGURE 2-2: INL Error vs. Input Voltage FIGURE 2-5: Maximum INL Error vs.
(V = 5.0V). Temperature.
DD
10
10
8
L (ppm) -20246 ++18255 C C oise (µV)RMS 56789 MCP3553
N +25 C N 4
I -4 -40 C ut 3 MCP3550/1
-6 p
-8 Out 12
-10
0
-5 -4 -3 -2 -1 0 1 2 3 4 5
-2.5 -1.5 -0.5 0.5 1.5 2.5
VIN (V) VIN (Volts)
FIGURE 2-3: INL Error vs. Input Voltage FIGURE 2-6: Output Noise vs. Input
(V = 5.0V, V = 5V). Voltage (V = 2.7V).
DD REF DD
DS21950D-page 6 © 2007 Microchip Technology Inc.
MCP3550/1/3
Note: Unless otherwise specified, T = +25°C, V = 5V, V = 2.5V, V = 0V, V = V /2, V + = V -.
A DD REF SS CM REF IN IN
All ppm units use 2*V as full-scale range. Unless otherwise noted, graphs apply to entire MCP3550/1/3 family.
REF
15
10
)S 9
RM )MS 8
µV 10 VR 7
se ( MCP3553 e (µ 6 MCP3553
put Noi 5 MCP3550/1 put Nois 345 MCP3550/1
ut ut 2
O O
1
0
0
-2.5 -1.5 -0.5 0.5 1.5 2.5
-50 -25 0 25 50 75 100 125
VIN (V) Temperature (°C)
FIGURE 2-7: Output Noise vs. Input FIGURE 2-10: Output Noise vs.
Voltage (V = 5.0V). Temperature.
DD
u
10.0 5
9.0
)MS 8.0 4
R
V 7.0
ut Noise (µ 3456....0000 MCP3553 MCP3550/1 Offset (µV) 23
p
ut 2.0 1
O 1.0
0.0 0
0.0 1.0 2.0 3.0 4.0 5.0 2.5 3 3.5 4 4.5 5 5.5
V (V) V (V)
REF DD
FIGURE 2-8: Output Noise vs. V . FIGURE 2-11: Offset Error vs V
REF DD
(V =0V).
CM
7
10
)S 9 6
RM 8 5
oise (µV 567 MCP3553 set (µV) 34
put N 34 MCP3550/1 Off 2
ut 2 1
O
1
0
0
-50 -25 0 25 50 75 100 125
2.5 3 3.5 4 4.5 5 5.5
VDD (V) Temperature (°C)
FIGURE 2-9: Output Noise vs.V . FIGURE 2-12: Offset Error vs.
DD
Temperature (V = 5.0V).
REF
© 2007 Microchip Technology Inc. DS21950D-page 7
MCP3550/1/3
Note: Unless otherwise specified, T = +25°C, V = 5V, V = 2.5V, V = 0V, V = V /2, V + = V -.
A DD REF SS CM REF IN IN
All ppm units are ratioed against 2*V Unless otherwise noted, graphs apply to entire MCP3550/1/3 family.
REF .
5 4000
pm) 34 Positive Full-Scale nces 33050000 VVVDRCDEMF == = 51 2V.2.55VV
Error (p 012 Occurre 22050000 V1cT6oAIN 3n= =8s 24e05 cVCutive
Full-Scale ----4321 Negative Full-Scale Number of 11505000000 readings
-5 0
2.5 3 3.5 4 4.5 5 5.5 -15 -10 -5 0 5 10 15
VDD (V) Output Code (LSB)
FIGURE 2-13: Full-Scale Error vs. V . FIGURE 2-16: MCP3550/1 Output Noise
DD
Histogram.
10 1800
m) 68 es1600 VVDRDEF = = 5 2V.5V
or (pp 24 Positive Full-Scale urrenc11240000 VVTACIN M= = = 20 51V°.2C5V
ale Err -20 of Occ1800000 1re6a3d8i4n gcosnsecutive
ull-Sc --64 Negative Full-Scale mber 460000
F -8 Nu 200
-10
0
-50 -25 0 25 50 75 100 125
-15 -10 -5 0 5 10 15
Temperature (°C) Output Code (LSB)
FIGURE 2-14: Full-Scale Error vs. FIGURE 2-17: MCP3553 Output Noise
Temperature. Histogram.
5.0
10
4.0
8
m) 6 3.0
or (pp 24 Positive Full-Scale pm) 12..00
Scale Err --420 Negative Full-Scale TUE (p --210...000
Full- --86 --43..00
-10 -5.0
-50 -25 0 25 50 75 100 125 -2.5 -2.0 -1.5 -1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5
Temperature (°C) V (V)
IN
FIGURE 2-15: Full-Scale Error vs. FIGURE 2-18: Total Unadjusted Error
Temperature (V = 5.0V). (TUE) vs. Input Voltage (V = 2.7V).
REF DD
DS21950D-page 8 © 2007 Microchip Technology Inc.
MCP3550/1/3
Note: Unless otherwise specified, T = +25°C, V = 5V, V = 2.5V, V = 0V, V = V /2, V + = V -.
A DD REF SS CM REF IN IN
All ppm units use 2*V as full-scale range.Unless otherwise noted, graphs apply to entire MCP3550/1/3 family.
REF
5 6
4
3 m) 5
p
m) 12 E (p 4
p U
E (p 0 m T 3
TU -1 mu 2
-2 xi
-3 Ma 1
-4
0
-5
-50 -25 0 25 50 75 100 125
-2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5
VIN (V) Temperature (°C)
FIGURE 2-19: Total Unadjusted Error FIGURE 2-22: Maximum TUE vs.
(TUE) vs. Input Voltage. Temperature.
10 5
8 4.5
6 4
TUE (ppm) --42024 TUE (ppm) 123...52535
-6
1
-8
0.5
-10
0
-5 -4 -3 -2 -1 0 1 2 3 4 5 2.5 2.7 3 3.3 4 5 5.5
V (V) V (V)
IN DD
FIGURE 2-20: Total Unadjusted Error FIGURE 2-23: Maximum TUE vs. V .
DD
(TUE) vs. Input Voltage (V = 5.0V).
REF
10 0.6
9
m) 8 0.5
pp 7 0.4 MCP3550/1
UE ( 6 A) 0.3
um T 45 (µDDS 0.2 MCP3553
m 3 I 0.1
xi
Ma 2 0
1
0 -0.1
0 1 2 3 4 5 -50 -25 0 25 50 75 100 125
V (V) Temperature (°C)
REF
FIGURE 2-21: Maximum TUE vs. V . FIGURE 2-24: I vs. Temperature.
REF DDS
© 2007 Microchip Technology Inc. DS21950D-page 9
MCP3550/1/3
Note: Unless otherwise specified, T = +25°C, V = 5V, V = 2.5V, V = 0V, V = V /2, V + = V -.
A DD REF SS CM REF IN IN
All ppm units use 2*V as full-scale range.Unless otherwise noted, graphs apply to entire MCP3550/1/3 family.
REF
200 160
180 140 MCP3550-60, MCP3553
160 MCP3550-50, MCP3550/1
140 MCP3550-60, MCP3553 120
A) 120 A) 100
I (µDD 18000 MCP3550-50, MCP3550/1 I (µDD 6800
60
40
40
20 20
0 0
2.5 3 3.5 4 4.5 5 5.5 -50 -25 0 25 50 75 100 125
VDD (V) Temperature (°C)
FIGURE 2-25: I vs. V . FIGURE 2-26: I vs. Temperature.
DD DD DD
DS21950D-page 10 © 2007 Microchip Technology Inc.