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PDF MCP3427 Data sheet ( Hoja de datos )
| Número de pieza | MCP3427 | |
| Descripción | Multi-Channel Analog-to-Digital Converter | |
| Fabricantes | Microchip Technology | |
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MCP3426/7/8
16-Bit, Multi-Channel ΔΣ Analog-to-Digital Converter with
I2C™ Interface and On-Board Reference
Features
• 16-bit ΔΣ ADC with Differential Inputs:
- 2 channels: MCP3426 and MCP3427
- 4 channels: MCP3428
• Differential Input Full Scale Range: -VREF to
+VREF
• Self Calibration of Internal Offset and Gain per
Each Conversion
• On-Board Voltage Reference (VREF):
- Accuracy: 2.048V ± 0.05%
- Drift: 15 ppm/°C
• On-Board Programmable Gain Amplifier (PGA):
- Gains of 1,2, 4 or 8
• INL: 10 ppm of Full Scale Range
• 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 (VDD= 3V):
- Continuous Conversion: 135 µA typical
- One-Shot Conversion with 1 SPS:
- 9 µA typical for 16 bit mode
- 2.25 µA typical for 14 bit mode
- 0.56 µA typical for 12 bit mode
• On-Board Oscillator
• I2C™ Interface:
- Standard, Fast and High Speed Modes
- User configurable two external address
selection pins for MCP3427 and MCP3428
• Single Supply Operation: 2.7V to 5.5V
• Extended Temperature Range: -40°C to +125°C
Typical Applications
• Portable Instrumentation and Consumer Goods
• Temperature Sensing with RTD, Thermistor, and
Thermocouple
• Bridge Sensing for Pressure, Strain, and Force
• Weigh Scales and Battery Fuel Gauges
• Factory Automation Equipment
Description
The MCP3426, MCP3427 and MCP3428 devices
(MCP3426/7/8) are the low noise and high accuracy
16 Bit Delta-Sigma Analog-to-Digital (ΔΣ A/D) Con-
verter family members of the MCP342X series from
Microchip Technology Inc. These devices can convert
analog inputs to digital codes with up to 16 bits of reso-
lution.
The MCP3426 and MCP3427 devices have two
differential input channels and the MCP3428 has four
differential input channels. All electrical properties of
these three devices are the same except the
differences in the number of input channels and I2C
address bit selection options.
These devices can output analog-to-digital conversion
results at rates of 15 (16-bit mode), 60 (14-bit mode), or
240 (12-bit mode) samples per second depending on
the user controllable configuration bit settings using the
two-wire I2C serial interface. During each conversion,
the device calibrates offset and gain errors
automatically. This provides accurate conversion
results from conversion to conversion over variations in
temperature and power supply fluctuation.
The device has an on-board 2.048V reference voltage,
which enables an input range of ± 2.048V differentially
(full scale range = 4.096/PGA).
The user can select the gain of the on-board
programmable gain amplifier (PGA) using the
configuration register bits (gain of x1, x2, x4, or x8).
This allows the MCP3426/7/8 devices to convert a very
weak input signal with high resolution.
The MCP3426/7/8 devices have two conversion
modes: (a) One-Shot Conversion mode and
(b) Continuous Conversion mode. In the One-Shot
conversion mode, the device performs a single
conversion and enters a low current standby
(shutdown) mode automatically until it receives another
conversion command. This reduces current
consumption greatly during idle periods. In continuous
conversion mode, the conversion takes place
continuously at the configured conversion speed. The
device updates its output buffer with the most recent
conversion data.
The devices operate from a single 2.7V to 5.5V power
supply and have a two-wire I2C compatible serial
interface for a standard (100 kHz), fast (400 kHz), or
high-speed (3.4 MHz) mode.
© 2009 Microchip Technology Inc.
DS22226A-page 1
1 page  
MCP3426/7/8
www.DataSheet4U.com
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings†
VDD...................................................................................7.0V
All inputs and outputs ............. ..........VSS –0.4V to VDD+0.4V
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,
CHn+ = CHn- = VREF/2, VINCOM = VREF /2. All ppm units use 2*VREF as differential full scale range.
Parameters
Sym
Min
Typ
Max Units
Conditions
Analog Inputs
Differential Full Scale Input
Voltage Range
FSR
— ±2.048/PGA
—
V VIN = [CHn+ - CHn-]
Maximum Input Voltage Range
Differential Input Impedance
ZIND (f)
VSS-0.3
—
—
2.25/PGA
VDD+0.3
—
V (Note 1)
MΩ During normal mode operation
(Note 2)
Common Mode input
Impedance
ZINC (f)
—
25
— MΩ PGA = 1, 2, 4, 8
System Performance
Resolution and No Missing
Codes
(Effective Number of Bits)
(Note 3)
12 —
14 —
16 —
— Bits DR = 240 SPS
— Bits DR = 60 SPS
— Bits DR = 15 SPS
Data Rate
(Note 4)
DR 176
44
240
60
328 SPS 12 bits mode
82 SPS 14 bits mode
11 15
20.5 SPS 16 bits mode
Output Noise
Integral Non-Linearity
—
INL —
2.5
10
— µVRMS TA = +25°C, DR =15 SPS,
PGA = 1, VIN+ = VIN- = GND
— ppm of DR = 15 SPS
FSR (Note 5)
Internal Reference Voltage
VREF
—
2.048
—
V
Gain Error (Note 6)
— 0.1
— % PGA = 1, DR = 15 SPS
PGA Gain Error Match (Note 6)
— 0.1
— % Between any 2 PGA settings
Gain Error Drift (Note 6)
— 15
— ppm/°C PGA=1, DR=15 SPS
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: This parameter is ensured by design and not 100% tested.
4: The total conversion speed includes auto-calibration of offset and gain.
5: INL is the difference between the endpoints line and the measured code at the center of the quantization band.
6: Includes all errors from on-board PGA and VREF.
7: This parameter is ensured by characterization and not 100% tested.
8: MCP3427 and MCP3428 only.
9: Addr_Float voltage is applied at address pin.
10: No voltage is applied at address pin (left “floating”).
© 2009 Microchip Technology Inc.
DS22226A-page 5
5 Page 
MCP3426/7/8
www.DataSheet4U.com
3.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1: PIN FUNCTION TABLE
MCP3426
MCP3427 MCP3428
DFN
MSOP,
SOIC
DFN
MSOP
SOIC,
TSSOP
1111
2222
7744
8855
6633
3366
4477
5588
——
9
9
— — 10 10
————
————
————
————
9 — 11 —
1
2
3
4
5
6
7
8
9
10
11
12
13
14
—
Sym
CH1+
CH1-
CH2+
CH2-
VSS
VDD
SDA
SCL
Adr0
Adr1
CH3+
CH3-
CH4+
CH4-
EP
Function
Positive Differential Analog Input Pin of Channel 1
Negative Differential Analog Input Pin of Channel 1
Positive Differential Analog Input Pin of Channel 2
Negative Differential Analog Input Pin of Channel 2
Ground Pin
Positive Supply Voltage Pin
Bidirectional Serial Data Pin of the I2C Interface
Serial Clock Pin of the I2C Interface
I2C Address Selection Pin. See Section 5.3.2.
I2C Address Selection Pin. See Section 5.3.2.
Positive Differential Analog Input Pin of Channel 3
Negative Differential Analog Input Pin of Channel 3
Positive Differential Analog Input Pin of Channel 4
Negative Differential Analog Input Pin of Channel 4
Exposed Thermal Pad (EP); must be connected to
VSS
3.1 Analog Inputs (CHn+, CHn-)
CHn+ and CHn- are differential input pins for
channel n. The user can also connect CHn- pin to VSS
for a single-ended operation. See Figure 6-4 for
differential and single-ended connection examples.
The maximum voltage range on each differential input
pin is from VSS-0.3V to VDD+0.3V. Any voltage below or
above this range will cause leakage currents through
the Electrostatic Discharge (ESD) diodes at the input
pins.
This ESD current can cause unexpected performance
of the device. The input voltage at the input pins should
be within the specified operating range defined in
Section 1.0 “Electrical Characteristics” and
Section 4.0 “Description of Device Operation”.
See Section 4.5 “Input Voltage Range” for more
details of the input voltage range.
Figure 3-1 shows the input structure of the device. The
device uses a switched capacitor input stage at the
front end. CPIN is the package pin capacitance and
typically about 4 pF. D1 and D2 are the ESD diodes.
CSAMPLE is the differential input sampling capacitor.
3.2 Supply Voltage (VDD, VSS)
VDD is the power supply pin for the device. This pin
requires an appropriate bypass ceramic capacitor of
about 0.1 µF to ground to attenuate high frequency
noise presented in application circuit board. An
additional 10 µF capacitor (tantalum) in parallel is also
recommended to further attenuate current spike
noises. The supply voltage (VDD) must be maintained
in the 2.7V to 5.5V range for specified operation.
VSS is the ground pin and the current return path of the
device. The user must connect the VSS pin to a ground
plane through a low impedance connection. If an
analog ground path is available in the application PCB
(printed circuit board), it is highly recommended that
the VSS pin be tied to the analog ground path or
isolated within an analog ground plane of the circuit
board.
© 2009 Microchip Technology Inc.
DS22226A-page 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MCP3427.PDF ] | |
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