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MCP3914 데이터시트 PDF




Microchip에서 제조한 전자 부품 MCP3914은 전자 산업 및 응용 분야에서
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부품번호 MCP3914 기능
기능 3V Eight-Channel Analog Front End
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MCP3914 데이터시트, 핀배열, 회로
MCP3914
3V Eight-Channel Analog Front End
Features:
• Eight Synchronous Sampling 24-bit Resolution
Delta-Sigma Analog-to-Digital (A/D) Converters
• 94.5 dB SINAD, -107 dBc Total Harmonic
Distortion (THD) (up to 35th Harmonic), 112 dBFS
SFDR for Each Channel
• Enables 0.1% Typical Active Power Measurement
Error over a 10,000:1 Dynamic Range
• 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
• -122 dB Crosstalk between Channels
• Low Drift 1.2V Internal Voltage Reference:
9 ppm/°C
• Differential Voltage Reference Input Pins
• High Gain Programmable-Gain Amplifier (PGA)
on Each Channel (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 for Each Channel
• High-Speed 20 MHz Serial Peripheral Interface
(SPI) with Mode 0,0 and 1,1 Compatibility
• Continuous Read/Write Modes for Minimum
Communication Time with Dedicated 16/32-bit
Modes
• Available in a 40-lead UQFN Package
• Extended Temperature Range: -40°C to +125°C
Applications:
• Polyphase Energy Meters
• Energy Metering and Power Measurement
• Automotive
• Portable Instrumentation
• Medical and Power Monitoring
• Audio/Voice Recognition
Description:
The MCP3914 is a 3V eight-channel Analog Front End
(AFE), containing eight synchronous sampling delta-
sigma, Analog-to-Digital Converters (ADC), eight
PGAs, phase delay compensation block, low-drift
internal voltage reference, digital offset and gain error
calibration registers, and high-speed 20 MHz SPI-
compatible serial interface.
The MCP3914 ADCs are 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. The 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- or 32-bit MCU, and with the separate data ready
pin that can directly be connected to an Interrupt
Request (IRQ) input of an MCU.
The MCP3914 includes advanced security features to
secure the communications and the configuration
settings, such as a CRC-16 checksum on both serial
data outputs and static register map configuration. It
also includes a register-map lock through an 8-bit
secure key to stop unwanted write commands from
processing.
The MCP3914 is capable of interfacing with a variety of
voltage and current sensors, including shunts, current
transformers, Rogowski coils and Hall-effect sensors.
Package Type
MCP3914, 5x5 UQFN*
40 39 38 37 36 35 34 33 32 31
CH2+ 1
CH2- 2
CH3- 3
CH3+ 4
NC 5
NC 6
CH4+ 7
30 SDI
29 SDO
28 SCK
27 CS
EP 26 OSC2
41 25 OSC1/CLKI
24 DGND
CH4- 8
23 NC
CH5- 9
CH5+ 10
22 DR
21 DGND
11 12 13 14 15 16 17 18 19 20
* Includes Exposed Thermal Pad (EP); see Table 3-1.
2013 Microchip Technology Inc.
DS20005216A-page 1




MCP3914 pdf, 반도체, 판매, 대치품
MCP3914
TABLE 1-1: ANALOG SPECIFICATIONS (CONTINUED)
Electrical Specifications: Unless otherwise indicated, all parameters apply at AVDD = DVDD = 2.7V to 3.6 V, 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;VIN = -0.5 dBFS @ 50/60 Hz on all channels.
Characteristic
Sym
Min Typ Max
Units
Conditions
Integral Non-Linearity
INL — 5 — ppm
Measurement Error
ME
— 0.1
% Measured with a 10,000:1
dynamic range
(from 600 mVPeak to 60 µVPeak),
AVDD = DVDD = 3V,
measurement points averaging
time: 20 seconds, measured on
each channel pair (CH0/1,
CH2/3, CH4/5 and CH6/7)
Differential Input
Impedance
ZIN
Signal-to-Noise and
Distortion Ratio (Note 1)
Total Harmonic Distortion
(Note 1)
Signal-to-Noise Ratio
(Note 1)
Spurious Free Dynamic
Range (Note 1)
Crosstalk (50, 60 Hz)
AC Power
Supply Rejection
SINAD
THD
SNR
SFDR
CTALK
AC PSRR
232 —
142 —
72 —
38 —
36 —
33 —
92 94.5
— -107 -103
92 95
— 112
— -122
— -73
kG = 1, proportional to 1/AMCLK
kG = 2, proportional to 1/AMCLK
kG = 4, proportional to 1/AMCLK
kG = 8, proportional to 1/AMCLK
kG = 16, proportional to 1/AMCLK
kG = 32, proportional to 1/AMCLK
dB
dBc Includes the first 35 harmonics
dB
dBFS
dB Note 4
dB AVDD = DVDD = 3V + 0.6VPP
50/60 Hz, 100/120 Hz
DC Power
Supply Rejection
DC PSRR
— -73
dB AVDD = DVDD = 2.7V to 3.6V
DC Common
Mode Rejection
DC CMRR
— -100
dB VCM from -1V to +1V
Note 1:
2:
3:
4:
5:
6:
7:
Dynamic Performance specified at -0.5 dB below the maximum differential input value,
VIN = 1.2 VPP = 424 mVRMS @ 50/60 Hz, VREF = 1.2V. 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<7:0> = 00000000,
RESET<7:0> = 00000000, VREFEXT = 0, CLKEXT = 0.
For these operating currents, the following configuration bit settings apply: SHUTDOWN<7:0> = 11111111,
VREFEXT = 1, CLKEXT = 1.
Measured on one channel versus all others channels. The average of crosstalk performance over all channels
(see Figure 2-32 for individual channel performance).
Applies to all gains. Offset and gain errors depend on PGA gain setting, see typical performance curves for typical
performance.
Outside of this range, 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 ADC accuracy, AMCLK should be limited to the maximum frequency defined in
the 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 in the defined range in the Table 5-2.
DS20005216A-page 4
2013 Microchip Technology Inc.

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MCP3914 전자부품, 판매, 대치품
MCP3914
TABLE 1-3: SERIAL AC CHARACTERISTICS TABLE
Electrical Specifications: Unless otherwise indicated, all parameters apply at DVDD = 2.7 to 3.6 V,
TA = -40°C to +125°C, GAIN = 1, CLOAD = 30 pF
Characteristic
Sym
Min
Typ
Max
Units
Conditions
Serial Clock Frequency
CS Setup Time
CS Hold Time
CS Disable Time
Data Setup Time
Data Hold Time
Serial Clock High Time
Serial Clock Low Time
Serial Clock Delay Time
Serial Clock Enable Time
Output Valid from SCK Low
Output Hold Time
Output Disable Time
Reset Pulse Width (RESET)
Data Transfer Time to DR
(Data Ready)
fSCK
tCSS
tCSH
tCSD
tSU
tHD
tHI
tLO
tCLD
tCLE
tDO
tHO
tDIS
tMCLR
tDODR
25
50
50
5
10
20
20
50
50
0
100
20 MHz
— ns
— ns
— ns
— ns
— ns
— ns
— ns
— ns
— ns
25 ns
— ns Note 1
25 ns Note 1
— ns
25 ns Note 2
Modulator Mode Entry to
Modulator Data Present
tMODSU
— 100 ns
Data Ready Pulse Low Time tDRP
1/(2 x DMCLK)
Note 1: This parameter is periodically sampled and not 100% tested.
2: This parameter is established by characterization and not production tested.
µs
TABLE 1-4: TEMPERATURE SPECIFICATIONS TABLE
Electrical Specifications: Unless otherwise indicated, all parameters apply at AVDD = 2.7 to 3.6V, DVDD = 2.7 to 3.6V.
Parameters
Sym Min Typ Max Units
Conditions
Temperature Ranges
Operating Temperature Range
Storage Temperature Range
TA -40
TA -65
+125
+150
°C Note 1
°C
Thermal Package Resistances
Thermal Resistance, 40L 5x5 UQFN JA
41
— °C/W
Note 1: The internal junction temperature (TJ) must not exceed the absolute maximum specification of +150°C.
2013 Microchip Technology Inc.
DS20005216A-page 7

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