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MCP3918 の電気的特性と機能

MCP3918のメーカーはMicrochipです、この部品の機能は「3V Single-Channel Analog Front End」です。


製品の詳細 ( Datasheet PDF )

部品番号 MCP3918
部品説明 3V Single-Channel Analog Front End
メーカ Microchip
ロゴ Microchip ロゴ 




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MCP3918 Datasheet, MCP3918 PDF,ピン配置, 機能
MCP3918
3V Single-Channel Analog Front End
Features:
• One 24-bit Resolution Delta-Sigma A/D Converter
• 93.5 dB SINAD, -107 dBc Total Harmonic
Distortion (THD) (up to 35th harmonic), 112 dB
Spurious-Free Dynamic Range (SFDR)
• Flexible Serial Interface that Includes Both SPI
and a Simple 2-Wire Interface Ideal for Polyphase
Shunt Energy Meters
• Advanced Security Features:
- 16-bit Cyclic Redundancy Check (CRC)
Checksum on All Communications for Secure
Data Transfers
- 16-bit CRC Checksum and Interrupt Alert for
Register-Map Configuration
- Register-Map Lock with 8-bit Secure Key
• 2.7V – 3.6V AVDD, DVDD
• Programmable Data Rate, up to 125 ksps:
- 4 MHz Maximum Sampling Frequency
- 16 MHz Maximum Master Clock
• Oversampling Ratio, up to 4096
• Ultra Low-Power Shutdown Mode with < 10 µA
• Low-Drift 1.2V Internal Voltage Reference:
9 ppm/°C
• Differential Voltage Reference Input Pins
• High-Gain Programmable Gain Amplifier (PGA)
(up to 32 V/V)
• Phase Delay Compensation with 1 µs Time
Resolution
• Separate Data Ready Pin for Easy
Synchronization
• Individual 24-bit Digital Offset and Gain Error
Correction
• High-Speed 20 MHz SPI Interface with Mode 0,0
and 1,1 Compatibility
• Continuous Read/Write Modes for Minimum
Communication with Dedicated 16-/32-bit Modes
• Available in 20-lead QFN and SSOP Packages
• Extended Temperature Range: -40°C to +125°C
(all specifications are valid down to -45°C)
Description:
The MCP3918 is a 3V single-channel Analog Front End
(AFE), containing one delta-sigma, Analog-to-Digital
Converter (ADC), one programmable gain amplifier
(PGA), phase delay compensation block, low-drift
internal voltage reference, digital offset and gain errors
calibration registers, and high-speed 20 MHz
SPI-compatible serial interface.
The MCP3918 ADC is fully configurable with features
such as: 16-/24-bit resolution, Oversampling Ratio
(OSR) from 32 to 4096, gain from 1x to 32x,
independent Shutdown and Reset, dithering and
auto-zeroing. Communication is largely simplified with
8-bit commands, including various continuous
read/write modes and 16-/24-/32-bit data formats that
can be accessed by the Direct Memory Access (DMA)
of an 8-/16-/32-bit MCU, and with the separate Data
Ready pin that can be directly connected to an Interrupt
Request (IRQ) input of an MCU.
The MCP3918 includes advanced security features to
secure the communications and the configuration
settings, such as a CRC-16 checksum on both serial
data outputs and on the register-map static
configuration. It also includes a register-map lock
through an 8-bit password to avoid the processing of
any unwanted write commands.
For polyphase shunt-based energy meters, the
MCP3918 2-Wire serial interface greatly reduces
system cost, requiring only a single bidirectional
isolator per phase.
The MCP3918 is capable of interfacing a variety of
voltage and current sensors, including shunts, current
transformers, Rogowski coils and Hall effect sensors.
Applications:
• Single-Phase and Polyphase Energy Meters
• Energy Metering and Power Measurement
• Automotive
• Portable Instrumentation
• Medical and Power Monitoring
• Audio/Voice Recognition
• Isolator Sensor Application
2014 Microchip Technology Inc.
DS20005287A-page 1

1 Page





MCP3918 pdf, ピン配列
MCP3918
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings †
VDD ..................................................................... -0.3V to 4.0V
Digital inputs and outputs w.r.t. AGND................ --0.3V to 4.0V
Analog input w.r.t. AGND ..................................... ....-2V to +2V
VREF input w.r.t. AGND ............................... -0.6V to VDD +0.6V
Storage temperature .....................................-65°C to +150°C
Ambient temp. with power applied ................-65°C to +125°C
Soldering temperature of leads (10 seconds) ............. +300°C
ESD on the analog inputs (HBM, MM) ................ 4.0 kV, 200V
ESD on all other pins (HBM, MM) ....................... 4.0 kV, 200V
1.1 Electrical Specifications
† 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 indicated in the operational
listings of this specification, is not implied. Exposure to
maximum rating conditions for extended periods may
affect device reliability.
TABLE 1-1: ANALOG SPECIFICATIONS
Electrical Specifications: Unless otherwise indicated, all parameters apply at AVDD = DVDD = 3V, MCLK = 4 MHz;
PRE<1:0> = 00; OSR = 256; GAIN = 1; VREFEXT = 0, CLKEXT = 1, DITHER<1:0> = 11; BOOST<1:0> = 10,
VCM = 0V; TA = -40°C to +125°C (Note 1); VIN = 1.2 VPP = -0.5 dBFS @ 50/60 Hz on all channels.
Characteristic
Sym.
Min. Typ. Max. Units
Conditions
ADC Performance
Resolution
(No Missing Codes)
24 — —
bits OSR = 256 or greater
Sampling Frequency
Output Data Rate
fS(DMCLK)
fD(DRCLK)
1 4 MHz For maximum condition,
BOOST<1:0> = 11
4 125 ksps For maximum condition,
BOOST<1:0> = 11,
OSR = 32
Analog Input Absolute
Voltage on CH0+/- pins
Analog Input
Leakage Current
CH0+/-
IIN
-1 — +1
— +/-1 —
V All analog input channels,
measured to AGND
nA RESET<0> = 1,
MCLK running continuously
Differential Input
Voltage Range
Offset Error
Offset Error Drift
(CH0+-CH0-) -600/GAIN
VOS
-1
— +600/GAIN mV VREF = 1.2V,
proportional to VREF
0.2 1
mV Note 5
0.5 — µV/°C
Gain Error
GE
-4 — +4
% Note 5
Gain Error Drift
— 1 — ppm/°C
Integral Non-Linearity
INL
— 5 — ppm
Note 1:
2:
3:
4:
5:
6:
7:
All specifications are valid down to -45°C.
This specification implies that the ADC output is valid over this entire differential range and that there is no distortion or
instability across this input range. Dynamic Performance specified at -0.5 dB below the maximum signal range,
VIN = 1.2 VPP = 424 mVRMS, VREF = 1.2V @ 50/60 Hz. See Section 4.0 “Terminology and Formulas” for definition.
This parameter is established by characterization and not 100% tested.
For these operating currents, the following configuration bit settings apply: SHUTDOWN<0> = 0, RESET<0> = 0,
VREFEXT = 0, CLKEXT = 0.
For these operating currents, the following configuration bit settings apply: SHUTDOWN<0> = 1, VREFEXT = 1,
CLKEXT = 1.
Applies to all gains. Offset and gain errors depend on the PGA gain setting. See Section 2.0 “Typical Performance
Curves” for typical performance.
Outside this range, the ADC accuracy is not specified. An extended input range of +/-2V can be applied continuously to
the part, with no damage.
For proper operation and for optimizing the ADC accuracy, AMCLK should be limited to the maximum frequency defined
in Table 5-2, as a function of the BOOST and PGA setting chosen. MCLK can take larger values as long as the
prescaler settings (PRE<1:0>) limit AMCLK = MCLK/PRESCALE within the defined range in Table 5-2.
2014 Microchip Technology Inc.
DS20005287A-page 3


3Pages


MCP3918 電子部品, 半導体
MCP3918
TABLE 1-1: ANALOG SPECIFICATIONS (CONTINUED)
Electrical Specifications: Unless otherwise indicated, all parameters apply at AVDD = DVDD = 3V, MCLK = 4 MHz;
PRE<1:0> = 00; OSR = 256; GAIN = 1; VREFEXT = 0, CLKEXT = 1, DITHER<1:0> = 11; BOOST<1:0> = 10,
VCM = 0V; TA = -40°C to +125°C (Note 1); VIN = 1.2 VPP = -0.5 dBFS @ 50/60 Hz on all channels.
Characteristic
Sym.
Min. Typ. Max. Units
Conditions
Operating Current, Digital
IDD,D
— 0.2 0.3 mA MCLK = 4 MHz,
proportional to MCLK
— 0.7 —
mA MCLK = 16 MHz,
proportional to MCLK
Shutdown Current, Analog
Shutdown Current, Digital
Pull-Down Current
on OSC2 Pin
(External Clock Mode)
IDDS,A
IDDS,D
IOSC2
—— 1
—— 2
— 35 —
µA AVDD pin only (Note 4)
µA DVDD pin only (Note 4)
µA CLKEXT = 1
Note 1:
2:
3:
4:
5:
6:
7:
All specifications are valid down to -45°C.
This specification implies that the ADC output is valid over this entire differential range and that there is no distortion or
instability across this input range. Dynamic Performance specified at -0.5 dB below the maximum signal range,
VIN = 1.2 VPP = 424 mVRMS, VREF = 1.2V @ 50/60 Hz. See Section 4.0 “Terminology and Formulas” for definition.
This parameter is established by characterization and not 100% tested.
For these operating currents, the following configuration bit settings apply: SHUTDOWN<0> = 0, RESET<0> = 0,
VREFEXT = 0, CLKEXT = 0.
For these operating currents, the following configuration bit settings apply: SHUTDOWN<0> = 1, VREFEXT = 1,
CLKEXT = 1.
Applies to all gains. Offset and gain errors depend on the PGA gain setting. See Section 2.0 “Typical Performance
Curves” for typical performance.
Outside this range, the ADC accuracy is not specified. An extended input range of +/-2V can be applied continuously to
the part, with no damage.
For proper operation and for optimizing the ADC accuracy, AMCLK should be limited to the maximum frequency defined
in Table 5-2, as a function of the BOOST and PGA setting chosen. MCLK can take larger values as long as the
prescaler settings (PRE<1:0>) limit AMCLK = MCLK/PRESCALE within the defined range in Table 5-2.
1.2 Serial Interface Characteristics
TABLE 1-2: SERIAL DC CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, all parameters apply at DVDD = 2.7 to 3.6 V,
TA = -40°C to +125°C (Note 1), CLOAD = 30 pF, applies to all digital I/O.
Characteristic
Sym.
Min.
Typ. Max. Units
Conditions
High-Level Input Voltage
Low-Level Input Voltage
Input Leakage Current
Output Leakage Current
Hysteresis
of Schmitt-Triggered Inputs
VIH
VIL
ILI
ILO
VHYS
0.7 DVDD
——
— 0.3 DVDD
— ±1
— — ±1
— 300 —
V Schmitt-Triggered
V Schmitt-Triggered
µA CS = DVDD,
VIN = DGND to DVDD
µA CS = DVDD,
VOUT = DGND or DVDD
mV DVDD = 3.3V only (Note 3)
Low-Level Output Voltage
VOL
— 0.4V
V IOL = +1.7 mA, DVDD = 3.3V
High-Level Output Voltage
VOH DVDD - 0.5 —
V IOH = -1.7 mA, DVDD = 3.3V
Internal Capacitance
(All Inputs and Outputs)
CINT
— —7
pF TA = +25°C, SCK = 1.0 MHz,
DVDD = 3.3V (Note 2)
Note 1: All specifications are valid down to -45°C.
2: This parameter is periodically sampled and not 100% tested.
3: This parameter is established by characterization and not production tested.
DS20005287A-page 6
2014 Microchip Technology Inc.

6 Page



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