MCP3428-E/ST - 16-Bit 4-Channel Sigma-Delta ADC | Microchip
N.º de pieza: MCP3428-E/ST ✓ ActivoMCP3428-E/ST Descripción general
An analog-to-digital converter, or ADC, is an interface IC that converts continuous analog voltage into a numerical value suitable for processing by a microcontroller or embedded control system. The MCP3428 belongs to the delta-sigma ADC family within the broader analog and mixed-signal semiconductor hierarchy. Delta-sigma conversion is especially useful when high resolution, low noise, and relatively slow measurement are more important than very high conversion speed.
The MCP3428 provides up to 16-bit resolution, four differential input channels, a 2.048 V precision reference, and a maximum 15 sps conversion rate. Its I2C interface allows a host controller to configure conversion settings and retrieve results, while the on-board reference reduces the external precision-component count. These characteristics make the device useful for temperature, pressure, strain, current, and other slowly changing industrial measurements.
Its four differential inputs can reject common-mode noise when the source and return paths are routed carefully. The architecture is particularly valuable in sensors whose outputs are small relative to system supply voltage. The 14-TSSOP package also supports compact PCB layouts, although the exposed signal and reference connections require clean grounding and stable analog supply arrangements.
Typical uses include process-control instrumentation, environmental monitoring, industrial sensor acquisition, laboratory measurement, and low-rate energy metering. MCP3428T-E/ST and other MCP342x family members may be considered when pin compatibility, resolution, or temperature-range requirements differ, but every substitute must be checked against the exact pinout, reference behavior, interface timing, and acquisition-cycle requirements.
For implementation, use short analog traces, a quiet reference return, and decoupling close to VDD and VSS. Confirm the source impedance and settling time because the 15 sps maximum rate leaves limited time for the selected conversion cycle. Digital interface traces should be kept away from sensitive input and reference nodes to prevent I2C activity from coupling into measured voltages.
This page consolidates the verified manufacturer and distributor information, separates known variants from true drop-in options, and adds engineering guidance on acquisition timing, grounding, decoupling, and replacement decisions. Those practical details help distinguish a nominal specification match from a design that can be qualified with confidence.
Alternativas directas para MCP3428-E/ST — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
MCP3428T-E/ST
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MCP3427-E/ST
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
MCP3424-E/ST
✅ Sustitución directa ⚠️ Especificaciones sin verificarConsulte el precio
Ver hoja de datos →MCP3423-E/ST
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
MCP3428-E/ST Valores máximos y características eléctricas
| ADC Type | Delta-sigma ADC |
| Resolución | Up to 16 bit |
| Number of Input Channels | 4 channels |
| Input Configuration | Differential inputs |
| Conversion Rate | 15 sps |
| Internal Reference Voltage | 2.048 V |
| Differential Input Range | ±2.048 V |
| Interfaz | I2C |
| Tensión de alimentación | 3.3 V or 5 V |
| Encapsulado | 14-TSSOP |
| Tipo de montaje | Surface mount |
| Automotive Classification | Automotive |
| Número de pines | 14 |
| Product Type | Analog-to-digital converter |
| Signal Class | Low-noise, high-accuracy ADC |
| Reference Source | On-board precision reference |
| Lead Finish | TSSOP-14 |
Configuración de pines de MCP3428-E/ST
| Pin 1 | SCL — I2C clock input |
| Pin 2 | SDA — I2C data input and output |
| Pin 3 | VREF — External reference voltage input when the internal reference is not used |
| Pin 4 | VDD — Positive analog and digital supply voltage |
| Pin 5 | VSS — Analog and digital ground |
| Pin 6 | CH0+ — Channel 0 positive input |
| Pin 7 | CH0- — Channel 0 negative input |
| Pin 8 | CH1+ — Channel 1 positive input |
| Pin 9 | CH1- — Channel 1 negative input |
| Pin 10 | CH2+ — Channel 2 positive input |
| Pin 11 | CH2- — Channel 2 negative input |
| Pin 12 | CH3+ — Channel 3 positive input |
| Pin 13 | CH3- — Channel 3 negative input |
| Pin 14 | ALERT — Conversion-ready or threshold alert output |
Aplicaciones típicas
MCP3428-E/ST es adecuado para 6 aplicacións: Industrial Process Sensing, Environmental Monitoring, Precision Temperature Measurement, Pressure and Load Measurement, Laboratory Instrumentation, Low-Rate Energy Measurement.
Industrial Process Sensing
The MCP3428-E/ST fits four-channel industrial sensor acquisition because it combines four differential inputs with up to 16-bit resolution in a 14-TSSOP package. Place each sensor pair on a matched input and return path, then configure the converter through I2C for the required conversion cycle. Its maximum 15 sps rate is appropriate for temperature, pressure, and level signals that change slowly rather than high-speed waveforms. The 2.048 V onboard reference gives the acquisition chain a defined measurement basis, while the ±2.048 V differential range accommodates bipolar sensor outputs. Because source impedance and sensor settling time determine whether the selected conversion cycle is sufficient, validate both together during design-in.
Recomendado
Environmental Monitoring
The MCP3428-E/ST is appropriate for multi-sensor environmental monitoring stations that measure slow temperature, humidity, pressure, or gas-sensor outputs. Its four differential input channels allow several front ends to share one converter, and the 16-bit scale supports fine measurement resolution over the 2.048 V reference range. The converter is installed as an I2C peripheral alongside a host microcontroller, while the selected conversion cycle keeps the acquisition rate compatible with slowly changing environmental conditions. Designers should thermally separate the converter from heat-generating regulators and place the reference bypass capacitor close to the device to reduce measurement drift.
Recomendado
Precision Temperature Measurement
The MCP3428-E/ST can acquire several precision temperature-sensor channels through its four differential inputs when the application values resolution over conversion speed. With a common 2.048 V reference and up to 16-bit resolution, the converter provides a stable basis for comparing RTD, thermistor, or analog temperature-front-end signals. The I2C interface simplifies connection to a system controller, and the 14-TSSOP footprint supports compact instrument designs. The main design constraint is source impedance: resistive sensors can require substantial settling time, so the sensor network and the ADC's configured acquisition timing must be evaluated as one system.
Recomendado
Pressure and Load Measurement
The MCP3428-E/ST suits bridge-based pressure, strain, and load-cell front ends where four differential channels can share a common excitation and measurement architecture. Differential input handling helps reject common-mode voltage, while the 16-bit resolution captures low-level bridge changes around the midscale of the ±2.048 V measurement range. The 15 sps ceiling is normally sufficient for static or slowly varying mechanical loads. For best results, keep excitation and sense routing symmetric, provide a low-noise reference path, and verify that the complete bridge and ADC settling behavior fits within the programmed conversion cycle before calibration.
Recomendado
Laboratory Instrumentation
The MCP3428-E/ST can serve as the measurement front end in compact laboratory instruments that require more resolution than a typical 12-bit MCU ADC and more channels than a single-channel converter. Four differential inputs permit direct connection to conditioned test signals, while the internal 2.048 V reference reduces external calibration components. The I2C connection is practical for control and data logging, and the 14-TSSOP package simplifies board integration. Calibration should account for offset and gain error, while analog traces and reference grounding must remain quiet to preserve the benefit of the converter's high resolution.
Recomendado
Low-Rate Energy Measurement
The MCP3428-E/ST is suitable for low-rate energy and power-monitoring circuits where several voltage or current signals must be digitized rather than waveform-captured. Its four differential channels support parallel measurements, and the ±2.048 V differential range can accept appropriately scaled sensor outputs. The 15 sps maximum conversion rate is adequate for slowly varying energy readings but not for high-frequency current waveform analysis. A practical design uses scaled shunt or divider outputs, a stable reference, and an I2C-connected controller that records results. Input filtering and anti-aliasing design must be based on the intended measurement bandwidth rather than merely the converter's maximum sample rate.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MCP3428-E/ST — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MCP3428T-E/ST | MCP3427-E/ST | MCP3424-E/ST | MCP3423-E/ST |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 14-TSSOP | 14-TSSOP | 14-TSSOP | 14-TSSOP | 14-TSSOP |
| ADC Architecture | Delta-sigma | Delta-sigma | Delta-sigma | Delta-sigma | Delta-sigma |
| Resolution | Up to 16 bit | Up to 16 bit | Up to 18 bit | 12 bit | Up to 16 bit |
| Input Channels | 4 channels | 4 channels | 4 channels | 4 channels | 3 channels |
| Input Configuration | Differential | Differential | Differential | Differential | Differential |
| Interface | I2C | I2C | I2C | I2C | I2C |
Diferenciadores clave
- Balanced four-channel 16-bit acquisition (frente a MCP3424-E/ST)
- Avoids the higher-resolution part's altered acquisition behavior (frente a MCP3427-E/ST)
- Uses all four differential input channels (frente a MCP3423-E/ST)
- Matches the closest MCP3428 ordering variant (frente a MCP3428T-E/ST)
Notas de diseño
Route each CHx+ and CHx- pair as a compact, closely coupled pair to minimize differential pickup from unrelated circuitry. Keep the SCL and SDA traces away from VREF, channel inputs, and their ground-return paths. Place the reference bypass capacitor close to its IC pin because reference-disturbance current can otherwise appear as measurement error. The four inputs are differential, so equal or controlled common-mode voltage should be maintained when the source circuit permits it.
Do not treat the 16-bit output as proof that all 16 bits are useful without accounting for noise, source impedance, and settling time. The maximum conversion rate is 15 sps, so sensor networks must settle during the selected acquisition and conversion interval. Check the sensor's output impedance, add an appropriate buffer when necessary, and calculate the digital code from the actual VREF and selected gain before writing scaling equations.
Place the supply bypass capacitor immediately beside VDD and VSS, and provide a low-impedance ground connection to the converter. If the board also includes switching regulators, separate their high-current paths and switching nodes from the MCP3428 analog area. The verified 2.048 V internal reference improves repeatability, but reference and supply noise can still propagate into the conversion result; verify the board-level noise floor with the intended sensor and acquisition settings.
Changing to a same-package MCP342x alternative solely because the footprint matches is not sufficient. Resolution, gain, acquisition timing, I2C command behavior, conversion rate, reference options, and the number of implemented channels can differ. MCP3428T-E/ST is the closest ordering-level alternative in the supplied results; MCP3427, MCP3424, and MCP3423 require renewed firmware and timing review before they can replace the MCP3428 in production.
Información de cumplimiento
The verified results identify the MCP3428 as an automotive-class ADC, but they do not provide explicit RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. These fields remain unknown rather than inferred.
