MCP3301-CI/P - 13-Bit 100ksps Diff ADC with SPI | Microchip
N.º de pieza: MCP3301-CI/P ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $6.95 | $6,95 |
| 10 | $6.18 | $61,80 |
| 100 | $5.34 | $534,00 |
| 500 | $4.55 | $2.275,00 |
| 1.000 | $3.96 | $3.960,00 |
MCP3301-CI/P Descripción general
An SAR ADC is a successive-approximation-register analog-to-digital converter, the dominant topology for medium-speed, medium-resolution precision conversion in microcontroller-based systems. SAR ADCs sit within the broader ADC taxonomy (Flash, SAR, Delta-Sigma, Dual-Slope) and are preferred where deterministic latency, low power consumption, and ease of microcontroller interface are required - exactly the trade-off space the MCP3301 targets.
Key features include true differential inputs with low integral nonlinearity, an external VREF input that scales input range dynamically, an SPI-compatible serial output that simplifies connection to virtually any microcontroller, and very low power consumption - typically 50 nA standby and 300 uA active. The 8-pin PDIP through-hole format supports easy prototyping, breadboarding, and legacy industrial designs where surface-mount is undesirable.
Architecturally, the MCP3301 combines a differential input sample-and-hold front-end, a precision SAR core clocked from an internal oscillator, and a discrete SPI output shift register. The combination produces one conversion per chip-select cycle, deterministic sampling instant, and intrinsic single-cycle latency - ideal for multiplexed sensor arrays and digital control loops.
Typical applications include battery-powered remote sensor nodes, industrial process control loops, portable instrumentation, multi-channel thermocouple or load-cell digitizers (paired with external multiplexers), and embedded data-acquisition front-ends for HVAC and energy-metering systems.
When designing with this part, remember to include a 0.1 uF decoupling capacitor close to the AVDD pin and to keep CS low during a full 13-clock conversion - releasing CS mid-frame will corrupt the output. The external VREF source must be low-noise to fully benefit from the 13-bit resolution.
This page synthesizes distributor pricing, drop-in PDIP alternatives, and practical design notes not found in the manufacturer datasheet alone.
Alternativas directas para MCP3301-CI/P — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
MCP3301-BI/P
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
MCP3301-CI/P
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$3.96 / unidad
Ver hoja de datos →MCP3302-BI/P
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
AD7705AN
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MCP3301-CI/P Valores máximos y características eléctricas
| Resolución | 13 bits |
| Number of Inputs | 1 (single-ended or differential) |
| Converter Type | SAR (Successive Approximation Register) |
| Sampling Rate (max) | 100 ksps |
| Input Channels | 1 differential / 2 single-ended |
| Supply Voltage (VDD) | 4.5 V to 5.5 V |
| Reference Voltage (VREF) | 400 mV to 5 V (external) |
| Input-Referred Resolution | 98 uV at 0.4 V VREF, 1.22 mV at 5 V VREF |
| Active Supply Current (typ) | 300 uA |
| Standby Supply Current (typ) | 50 nA |
| Digital Interface | SPI-compatible (Mode 0,0 and Mode 1,1) |
| Temperatura de funcionamiento | -40C to +85C (industrial) |
| Encapsulado | 8-pin PDIP (through-hole) |
| Tipo de montaje | Through-Hole |
| Estado RoHS | Compliant |
| Nivel MSL | 1 (unlimited, through-hole) |
Configuración de pines de MCP3301-CI/P
| Pin 1 | CS — Chip Select, active-low; starts and resets a conversion cycle |
| Pin 2 | CH0+ — Positive analog input |
| Pin 3 | CH0- — Negative analog input (reference for differential conversion) |
| Pin 4 | VSS — Ground (0 V) |
| Pin 5 | VREF — External reference voltage input (0.4 V to 5 V) |
| Pin 6 | VDD — Positive power supply, 4.5 V to 5.5 V |
| Pin 7 | DOUT — Serial data output (SPI MISO equivalent) |
| Pin 8 | CLK — Serial clock input |
Aplicaciones típicas
MCP3301-CI/P es adecuado para 6 aplicacións: Battery-Powered Remote Sensor Nodes, Industrial Process Control Loops, Portable Medical and Health Monitors, HVAC and Building Energy Metering, Embedded Data-Acquisition Front-Ends, Thermocouple and Load-Cell Digitizers.
Battery-Powered Remote Sensor Nodes
The MCP3301-CI/P is engineered for battery-powered remote sensing where years of standby life and modest active throughput are the design drivers. Typical standby current of 50 nA (per Microchip datasheet DS21700E) lets a single 2400 mAh LiSOCl2 cell power the ADC in an environmental monitoring node for multi-year deployments. With an active current of only 300 uA at full 100 ksps, the average draw during a once-per-minute wake-and-sample regime is under 5 uA. Pair it with a low-power MCU such as PIC16F18446 in deep sleep and a low-noise MCP1502 VREF to build maintenance-free telemetry units for agriculture, water-quality, and structural-health-monitoring installations.
Recomendado
Industrial Process Control Loops
In industrial 4-20 mA loop digitization and isolated sensor readout modules, the MCP3301-CI/P's 13-bit resolution (1.22 mV per LSB at 5 V VREF) and true differential inputs reject common-mode noise from motors and switchgear. According to the Microchip datasheet (DS21700E), the SPI interface simplifies isolation by limiting required digital lines to four (CS, CLK, DOUT, GND). A typical 4-20 mA receiver chain uses a 250 ohm sense resistor plus an instrumentation amp (MCP6G04) feeding the CH0+/- inputs, achieving 0.05 mA current resolution without external isolation on the analog front end. The 5 V supply and PDIP packaging suit legacy PLCs and programmable relay retrofits.
Recomendado
Portable Medical and Health Monitors
Portable medical devices such as handheld pulse oximeters, spirometers, and ECG front-ends benefit from the MCP3301-CI/P's combination of 13-bit resolution at 100 ksps and sub-milliamp active current. The differential input architecture simplifies connection to electrode leads and Wheatstone-bridge pressure sensors by rejecting 50/60 Hz common-mode pickup without bulky shielding. With 1.22 mV input resolution at 5 V VREF, the converter delivers clinically meaningful digitisation for low-frequency physiological signals. The 8-pin PDIP form factor further aids compliance workflows by simplifying rework and inspection in regulatory submissions.
Recomendado
HVAC and Building Energy Metering
Building automation systems rely on cost-effective 13-bit ADCs to digitize analog signals from temperature, humidity, and current-sensing transducers in distributed sensor panels. The MCP3301-CI/P's 5 V supply and through-hole PDIP form factor simplify integration into legacy building-management panels, while its 100 ksps burst capability supports rapid current-sensing for energy meters and variable-frequency drives. Its differential inputs accept direct connection to current-shunt monitors (such as the MCP6F02) without an external instrumentation amplifier, cutting board cost and BOM line items.
Recomendado
Embedded Data-Acquisition Front-Ends
Multi-channel data acquisition front-ends pair the MCP3301-CI/P with an external analog multiplexer (such as the MCP23S17-based 8-channel MUX or a DG408) to scan numerous sensors sequentially. The deterministic single-cycle SAR latency simplifies sample-rate scheduling for synchronous vibration, acoustic, or strain-gauge arrays. At 1.22 mV/LSB and 100 ksps, the converter provides adequate dynamic range for strain-gauge-based load cells after front-end amplification. SPI output means the host MCU can be slow or fast - the entire ADC core completes one conversion deterministically per CS cycle, easing firmware timing budgets.
Recomendado
Thermocouple and Load-Cell Digitizers
Low-frequency precision transducers such as K-type thermocouples and strain-gauge load cells pair naturally with the MCP3301-CI/P. After cold-junction compensation via a separate temperature sensor (e.g. MCP9700) and a precision instrumentation amplifier (MCP6G04), the 13-bit ADC delivers 1.22 mV resolution suitable for industrial thermocouple readouts. For load cells, the differential input accommodates the Wheatstone bridge directly, while an MCP1525 reference provides a stable excitation voltage. The through-hole PDIP package simplifies hand-prototyping of mechanical-test fixtures and benchtop scales used in small-batch quality control.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MCP3301-CI/P — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MCP3301-BI/P | MCP3302-BI/P | AD7705AN |
|---|---|---|---|---|
| Package | 8-PDIP (through-hole) | 8-PDIP - same | 14-PDIP - different | 8-PDIP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Analog Devices |
| Resolution | 13 bits | 13 bits | 13 bits | 16 bits |
| Sampling Rate (max) | 100 ksps | 100 ksps | 100 ksps | 60 Hz (sigma-delta) |
| Number of Channels | 1 differential / 2 single-ended | 1 differential / 2 single-ended | 2 differential / 4 single-ended | 2 differential (with PGA) |
| Converter Type | SAR | SAR | SAR | Sigma-Delta |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 2.7 V to 5.5 V |
| Operating Temperature | -40C to +85C | -40C to +125C | -40C to +125C | -40C to +85C |
| Active Current (typ) | 300 uA | 300 uA | 450 uA | 1 mA (active) |
| Automotive Grade | No (industrial) | Yes (AEC-Q100) | Yes (AEC-Q100) | No |
Diferenciadores clave
- Lowest standby current in its 13-bit class (frente a AD7705AN)
- Industrial-grade temperature with no automotive BOM tax (frente a MCP3301-BI/P)
- True differential inputs with input-referred step as low as 98 uV (frente a MCP3302-BI/P)
Notas de diseño
Place a 0.1 uF ceramic decoupling capacitor within 5 mm of the VDD pin (pin 6), with the ground side tied directly to the VSS plane. For high-throughput designs, add a 10 uF bulk tantalum or ceramic capacitor at the supply entry point. The MCP3301 draws 300 uA active and 50 nA standby, but the SPI clock and reference settling can still inject brief current spikes; local decoupling prevents these from corrupting the analog conversion via shared impedance on the 5 V rail.
CS must be held low for the entire 13 SCLK cycle of the conversion or the output shift register will reset prematurely. Pulling CS high mid-frame aborts the read and forces a fresh acquisition on the next CS falling edge. To start a new conversion, take CS high for at least the acquisition time (typically a few hundred nanoseconds) before bringing it low again. Designers migrating from a software-bit-banged SPI must ensure the CS-to-SCLK timing meets the tACQ spec in Microchip datasheet DS21700E.
Run the differential analog traces (CH0+/CH0-) as a matched-length pair with a continuous ground guard on either side to maximize common-mode rejection. Keep analog and digital traces separated by at least one ground 'moat' or physical creep gap. The VREF trace should be wide and short, treated as a sensitive analog net that must not share return paths with the SPI clock line. Through-hole PDIP land patterns are forgiving on hand-laid prototypes, but a small filled thermal relief on the GND plane will simplify manual soldering and rework.
Use a low-impedance, low-noise voltage reference on VREF (such as the Microchip MCP1525 or MCP1502) to preserve 13-bit precision across the full input range. A noisy or drifting VREF directly couples into conversion accuracy - if you need true 13 ENOB, treat VREF as a precision analog signal, not just a static supply. Reference decoupling typically uses 0.1 uF ceramic in parallel with a larger 1 uF to 10 uF tantalum/ceramic for low-frequency noise rejection. Allow at least 10 ms after power-up for the reference to settle before initiating the first conversion.
Información de cumplimiento
RoHS/REACH-compliant per Microchip product page. Through-hole PDIP is MSL 1 (unlimited floor life). Industrial temperature grade is -40C to +85C; for automotive applications choose MCP3301-BI/P (AEC-Q100 qualified, -40C to +125C).
