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MCP3424-E/SL

18-bit 4-ch ΔΣ ADC, I2C, PGA x1-8, 2.048V ref, self-cal, SOIC-14

3388

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Pieza del fabricante：

MCP3424-E/SL

Paquete：

SOIC-14 (8.65 x 3.9 x 1.25mm, 1.27mm pitch)

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Descripción

Productos

The MCP3424-E/SL is an 18-bit 4-channel delta-sigma ADC from Microchip with I2C interface, on-board 2.048V reference, programmable gain amplifier (PGA), and self-calibration in an SOIC-14 package.

Especificaciones

Resolution 18-bit / 16-bit / 14-bit / 12-bit (selectable)
Número de canales 4 (differential input pairs)
Architecture Delta-Sigma (ΔΣ)
Interface I2C (Standard, Fast, High-Speed)
Sample Rate vs Resolution 3.75 SPS (18-bit), 15 SPS (16-bit), 60 SPS (14-bit), 240 SPS (12-bit)
Input Type Differential
On-Board Reference 2.048V ± 0.05%, 15 ppm/°C drift
PGA Gain 1x, 2x, 4x, 8x (programmable)
INL 10 ppm of FSR max
Gain Error 0.05%
Tensión de alimentación 2.7V to 5.5V
Supply Current 135µA typical (continuous), 36µA (1 SPS one-shot)
I2C Address Pins 2 (A0, A1) for up to 4 device addresses
Temperatura de funcionamiento -40°C to +125°C
Paquete SOIC-14 (8.65 x 3.9mm)

Características

  • 18-bit resolution with 4 differential input channels
  • On-board 2.048V voltage reference with 0.05% accuracy
  • Programmable gain amplifier (PGA): x1, x2, x4, x8
  • Self-calibration of offset and gain per conversion
  • One-shot or continuous conversion modes
  • Configurable sample rate/resolution tradeoff
  • Low 135µA operating current, 36µA at 1 SPS one-shot
  • 2 address pins for multiple devices on one I2C bus
  • On-board oscillator (no external clock required)

Aplicaciones

  • Precision instrumentation and measurement
  • Weight scales and load cells
  • Battery fuel gauging and monitoring
  • Temperature measurement (thermocouples, RTDs)
  • Industrial process control

The MCP3424-E/SL from Microchip Technology is an 18-bit delta-sigma ADC with 4 differential input channels, on-board 2.048V reference, programmable gain amplifier, and I2C interface. The device provides selectable resolution/sample-rate combinations: 18-bit at 3.75 SPS for maximum precision, down to 12-bit at 240 SPS for faster measurements. The on-board PGA with gains of 1x, 2x, 4x, and 8x allows direct measurement of small signals (down to ±256mV full-scale at 8x gain) without external amplifiers. The 2.048V reference has 0.05% initial accuracy and 15 ppm/°C drift. Self-calibration of offset and gain is performed automatically on each conversion, ensuring accuracy over temperature and supply variations. One-shot mode reduces power to 36µA at 1 SPS. Two address pins (A0, A1) allow up to four MCP3424 devices on one I2C bus. The E/SL suffix denotes the extended temperature range (-40°C to +125°C) and SOIC-14 package.

The MCP3424-E/SL uses a third-order delta-sigma modulator followed by a digital decimation filter. The analog input is first selected by the input multiplexer (one of four differential pairs), then amplified by the programmable gain amplifier (PGA). The delta-sigma modulator oversamples the input at a high rate and produces a 1-bit data stream. The digital decimation filter processes this bitstream to produce a multi-bit output word. The resolution and output data rate are set by the decimation ratio: higher decimation yields more bits but slower output. At 18-bit mode (3.75 SPS), the modulator runs at a high oversampling ratio, and the digital filter produces 18-bit results with very low noise. The on-board 2.048V reference sets the full-scale range: at PGA=1, the differential input range is ±2.048V; at PGA=8, it is ±256mV. The self-calibration circuit measures and cancels internal offset and gain errors on every conversion, which maintains accuracy over temperature without user intervention. In one-shot mode, the device performs a single conversion and then enters low-power standby; the master reads the result via I2C. In continuous mode, the device converts repeatedly and the master can read the latest result at any time.

Pin Nombre Tipo Descripción
1 CH1+ Entrada Channel 1 positive differential input
2 CH1- Entrada Channel 1 negative differential input
3 CH2+ Entrada Channel 2 positive differential input
4 CH2- Entrada Channel 2 negative differential input
5 VSS Potencia Suelo
6 SDA E/S I2C serial data (open-drain)
7 SCL Entrada I2C serial clock
8 CH3+ Entrada Channel 3 positive differential input
9 CH3- Entrada Channel 3 negative differential input
10 CH4+ Entrada Channel 4 positive differential input
11 CH4- Entrada Channel 4 negative differential input
12 VDD Potencia Supply (2.7V to 5.5V)
13 A1 Entrada I2C address pin 1
14 A0 Entrada I2C address pin 0
  • Load Cells: 18-bit resolution + PGA x8 = 15.6µV LSB, ideal for weighing scales with strain gauges
  • Thermocouples: Self-calibration and 15ppm/°C reference maintain accuracy without periodic recalibration
  • Battery Monitoring: 2.048V reference measures cell voltages; 4 channels monitor individual cells in a pack
  • Low-Power Sensor: 36µA in one-shot mode at 1 SPS suits battery-powered field instruments
  • Multi-Channel: 4 differential channels replace 4 separate ADCs; 2 address pins = 16 channels per I2C bus
Modelo Fabricante Diferencia clave Paquete Specs
MCP3422-E/SN Microchip 2-channel, 18-bit, SOIC-8 - -
MCP3423-E/SN Microchip 2-channel, address pins, SOIC-8 - -
ADS1115IDGSR TI 16-bit, 4-ch, 860SPS, PGA, I2C, VSSOP-10 - -
LTC2499IUHF ADI 24-bit, 16-ch, I2C, QFN-28 - -
NAU7802SGI Nuvoton 24-bit, 2-ch, 320SPS, I2C, SOIC-16 - -

MCP3424-E/SL is an 18-bit 4-channel Δ-Σ ADC from Microchip in SOIC-14 with I2C interface. The MCP3422 provides 2 channels in SOIC-8. The MCP3423 offers 2 differential channels without programmable gain. The ADS1115 from TI provides 16-bit 4-channel ADC at 860SPS in VSSOP-10. The INA219 provides current/voltage monitoring with integrated shunt amplifier. The NAU7802 from Nuvoton offers 24-bit 2-channel for precision weighing. The AD7124 from ADI provides 24-bit 8-channel with programmable PGA.

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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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