MCP3425 Datasheet PDF - Microchip Technology


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MCP3425
Microchip Technology

Part Number MCP3425
Description 16-Bit Analog-to-Digital Converter
Page 30 Pages

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MCP3425
16-Bit Analog-to-Digital Converter
with I2C Interface and On-Board Reference
Features
• 16-bit ΔΣ ADC in a SOT-23-6 package
• Differential Input Operation
• Self Calibration of Internal Offset and Gain per
each conversion
• On-Board Voltage Reference:
- Accuracy: 2.048V ± 0.05%
• On-Board Programmable Gain Amplifier (PGA):
- Gains of 1, 2, 4 or 8
• On-Board Oscillator
• INL: 10 ppm of FSR (FSR = 4.096V/PGA)
• Programmable Data Rate Options:
- 15 SPS (16 bits)
- 60 SPS (14 bits)
- 240 SPS (12 bits)
• One-Shot or Continuous Conversion Options
• Low Current Consumption:
- 145 µA typical
(VDD= 3V, Continuous Conversion)
• One-Shot Conversion (1 SPS) with VDD = 3V:
- 9.7 µA typical with 16 bit mode
- 2.4 µA typical with 14 bit mode
- 0.6 µA typical with 12 bit mode
• Supports I2C Serial Interface:
- Standard, Fast and High-Speed Modes
• Single Supply Operation: 2.7V to 5.5V
• Extended Temperature Range: -40°C to 125°C
Typical Applications
• Portable Instrumentation
• Weigh Scales and Fuel Gauges
• Temperature Sensing with RTD, Thermistor, and
Thermocouple
• Bridge Sensing for Pressure, Strain, and Force.
Package Types
SOT-23-6
MCP3425
VIN+ 1
VSS 2
SCL 3
6 VIN-
5 VDD
4 SDA
Description
The MCP3425 is a single channel low-noise, high
accuracy ΔΣ A/D converter with differential inputs and
up to 16 bits of resolution in a small SOT-23-6 package.
The on-board precision 2.048V reference voltage
enables an input range of ±2.048V differentially
(Δ voltage = 4.096V). The device uses a two-wire I2C
compatible serial interface and operates from a single
2.7V to 5.5V power supply.
The MCP3425 device performs conversion at rates of
15, 60, or 240 samples per second (SPS) depending
on the user controllable configuration bit settings using
the two-wire I2C serial interface. This device has an
on-board programmable gain amplifier (PGA). The
user can select the PGA gain of x1, x2, x4, or x8 before
the analog-to-digital conversion takes place. This
allows the MCP3425 device to convert a smaller input
signal with high resolution. The device has two conver-
sion modes: (a) Continuous mode and (b) One-Shot
mode. In One-Shot mode, the device enters a low
current standby mode automatically after one conver-
sion. This reduces current consumption greatly during
idle periods.
The MCP3425 device can be used for various high
accuracy analog-to-digital data conversion applications
where design simplicity, low power, and small footprint
are major considerations.
Block Diagram
VSS
VDD
Voltage Reference
(2.048V)
Gain = 1, 2, 4, or 8
VREF
VIN+
PGA
ΔΣ ADC
Converter
Clock
Oscillator
VIN-
I2C Interface
SCL SDA
© 2009 Microchip Technology Inc.
DS22072B-page 1



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DS22072B-page 2
© 2009 Microchip Technology Inc.



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MCP3425
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1.0 ELECTRICAL
CHARACTERISTICS
1.1 Absolute Maximum Ratings†
VDD...................................................................................7.0V
All inputs and outputs w.r.t VSS ............... –0.3V to VDD+0.3V
Differential 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 ................ ≥ 6 kV HBM, 400V MM
Maximum Junction Temperature (TJ). .........................+150°C
†Notice: Stresses above those listed under “Maximum Rat-
ings” 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
operational listings of this specification is not implied.
Exposure to maximum rating conditions for extended periods
may affect device reliability.
ELECTRICAL CHARACTERISTICS
Electrical Specifications: Unless otherwise specified, all parameters apply for TA = -40°C to +85°C, VDD = +5.0V, VSS = 0V,
VIN+ = VIN- = VREF/2. All ppm units use 2*VREF as full-scale range.
Parameters
Sym
Min
Typ
Max Units
Conditions
Analog Inputs
Differential Input Range
Common-Mode Voltage Range
(absolute) (Note 1)
— ±2.048/PGA
VSS-0.3
VDD+0.3
V VIN = VIN+ - VIN-
V
Differential Input Impedance ZIND (f) — 2.25/PGA
(Note 2)
MΩ During normal mode operation
Common Mode input
Impedance
ZINC (f)
25
— MΩ PGA = 1, 2, 4, 8
System Performance
Resolution and No Missing
Codes (Note 8)
12 —
14 —
— Bits DR = 240 SPS
— Bits DR = 60 SPS
16 —
— Bits DR = 15 SPS
Data Rate (Note 3)
DR 176
240
328 SPS S1,S0 = ‘00’, (12 bits mode)
44 60
82 SPS S1,S0 = ‘01’, (14 bits mode)
11 15
20.5
SPS S1,S0 = ‘10’, (16 bits mode)
Output Noise
Integral Nonlinearity (Note 4)
INL
2.5
10
— µVRMS TA = +25°C, DR = 15 SPS,
PGA = 1, VIN = 0
ppm of DR = 15 SPS (Note 6)
FSR
Internal Reference Voltage
VREF
2.048
V
Gain Error (Note 5)
— 0.1
— % PGA = 1, DR = 15 SPS
PGA Gain Error Match (Note 5)
— 0.1
— % Between any 2 PGA gains
Gain Error Drift (Note 5)
— 15
— ppm/°C PGA=1, DR = 15 SPS
Note 1:
2:
3:
4:
5:
6:
7:
8:
Any input voltage below or greater than this voltage causes leakage current through the ESD diodes at the input pins.
This parameter is ensured by characterization and not 100% tested.
This input impedance is due to 3.2 pF internal input sampling capacitor.
The total conversion speed includes auto-calibration of offset and gain.
INL is the difference between the endpoints line and the measured code at the center of the quantization band.
Includes all errors from on-board PGA and VREF.
Full Scale Range (FSR) = 2 x 2.048/PGA = 4.096/PGA.
This parameter is ensured by characterization and not 100% tested.
This parameter is ensured by design and not 100% tested.
© 2009 Microchip Technology Inc.
DS22072B-page 3



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ELECTRICAL CHARACTERISTICS (CONTINUED)
Electrical Specifications: Unless otherwise specified, all parameters apply for TA = -40°C to +85°C, VDD = +5.0V, VSS = 0V,
VIN+ = VIN- = VREF/2. All ppm units use 2*VREF as full-scale range.
Parameters
Sym
Min
Typ
Max Units
Conditions
Offset Error
Offset Drift vs. Temperature
Common-Mode Rejection
VOS
30
300
100
— µV Tested at PGA = 1
VDD = 5.0V and DR = 15 SPS
— nV/°C VDD = 5.0V
— dB at DC and PGA =1,
Gain vs. VDD
— 105
—5
— dB at DC and PGA =8,
TA = +25°C
— ppm/V TA = +25°C, VDD = 2.7V to 5.5V,
PGA = 1
Power Supply Rejection at DC
— 95
— dB TA = +25°C, VDD = 2.7V to 5.5V,
PGA = 1
Power Requirements
Voltage Range
Supply Current during
Conversion
VDD
IDDA
Supply Current during Standby
Mode
IDDS
I2C Digital Inputs and Digital Outputs
2.7
155
145
0.1
5.5 V
190 µA VDD = 5.0V
— µA VDD = 3.0V
0.5 µA
High level input voltage
Low level input voltage
Low level output voltage
Hysteresis of Schmitt Trigger
for inputs (Note 7)
Supply Current when I2C bus
line is active
VIH
VIL
VOL
VHYST
0.7 VDD
0.05VDD
IDDB
VDD
0.3VDD
0.4
10
V
V
V IOL = 3 mA, VDD = +5.0V
V fSCL = 100 kHz
µA
Input Leakage Current
IILH
IILL
Pin Capacitance and I2C Bus Capacitance
-1
1 µA VIH = 5.5V
— µA VIL = GND
Pin capacitance
I2C Bus Capacitance
CPIN
Cb
10 pF
400 pF
Note 1: Any input voltage below or greater than this voltage causes leakage current through the ESD diodes at the input pins.
This parameter is ensured by characterization and not 100% tested.
2: This input impedance is due to 3.2 pF internal input sampling capacitor.
3: The total conversion speed includes auto-calibration of offset and gain.
4: INL is the difference between the endpoints line and the measured code at the center of the quantization band.
5: Includes all errors from on-board PGA and VREF.
6: Full Scale Range (FSR) = 2 x 2.048/PGA = 4.096/PGA.
7: This parameter is ensured by characterization and not 100% tested.
8: This parameter is ensured by design and not 100% tested.
TEMPERATURE SPECIFICATIONS
Electrical Characteristics: Unless otherwise indicated, TA = -40°C to +85°C, VDD = +5.0V, VSS = 0V.
Parameters
Sym Min Typ Max Units
Conditions
Temperature Ranges
Specified Temperature Range
Operating Temperature Range
Storage Temperature Range
Thermal Package Resistances
Thermal Resistance, 6L SOT-23
TA -40 — +85 °C
TA -40 — +125 °C
TA -65 — +150 °C
θJA — 190.5 — °C/W
DS22072B-page 4
© 2009 Microchip Technology Inc.




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