MAX1142BCAP+ - 14-Bit 200ksps ADC, +5V, 20-SSOP | Maxim Integrated
N.º de pieza: MAX1142BCAP+ ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $8.95 | $8,95 |
| 10 | $8.1 | $81,00 |
| 100 | $7.2 | $720,00 |
| 500 | $6.4 | $3.200,00 |
| 1.000 | $5.7 | $5.700,00 |
MAX1142BCAP+ Descripción general
An ADC (analog-to-digital converter) is a semiconductor device that converts continuous analog signals into discrete digital codes for processing by microcontrollers, DSPs, or FPGAs. Successive-approximation-register (SAR) ADCs use a binary-search algorithm with an internal DAC to resolve N bits in N clock cycles, achieving an excellent balance of speed, resolution, and power consumption. Within the broader taxonomy, SAR ADCs sit between flash converters (fastest, lowest resolution) and sigma-delta ADCs (highest resolution, slowest), and they are a key sub-category of mixed-signal data converters used across industrial, instrumentation, and embedded systems.
Key specifications of the MAX1142BCAP+ include 200 ksps sampling rate, 14-bit resolution (no missing codes), ±1 LSB INL (B-grade), an internal +4.096V reference, and 1 input channel. Power-supply requirements are +5V single-ended analog supply and +5V digital supply. The integrated +4.096V reference is convenient because 4.096V is exactly 1 mV per LSB, simplifying engineering-unit scaling. The wide input scaling network (via external resistor network) supports input ranges up to ±4A in current-sensing applications.
The MAX1142BCAP+ uses a charge-redistribution DAC with a precision bandgap reference, achieving low noise and high DC accuracy. The serial interface uses SPI/QSPI/MICROWIRE protocols, allowing direct connection to most microcontrollers and DSPs. An external reference can override the internal +4.096V reference when higher accuracy or a different full-scale range is required.
Typical applications include industrial process control and instrumentation, temperature and pressure monitoring with bridge sensors, current sensing in motor control, battery-powered data loggers, and patient monitoring. The wide input range makes it particularly attractive for ±4A current shunt monitoring and ±10V industrial signal conditioning.
When designing with the MAX1142BCAP+, ensure adequate input scaling to match full-scale range, and provide proper decoupling at AVDD and DVDD pins. The internal reference requires a stable supply; for noisy environments, add a 0.1uF ceramic bypass capacitor adjacent to the REF pin to minimize reference-induced conversion noise.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the manufacturer datasheet, providing a single reference for engineers evaluating or sourcing the MAX1142BCAP+.
Alternativas directas para MAX1142BCAP+ — 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:
MAX1142BEAP+
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX1142BCAP+T
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX1142AEAP+
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX1143BCAP
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX121CAP+
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX1142BCAP+ Valores máximos y características eléctricas
| Resolución | 14 Bit |
| Frecuencia de muestreo | 200 ksps |
| Number of Channels | 1 Input |
| Converter Type | SAR (Successive Approximation) |
| Supply Voltage (Analog) | +5V (4.75V min, 5.25V max) |
| Supply Voltage (Digital) | +5V |
| Input Type | Single Ended |
| Internal Reference Voltage | +4.096V |
| Reference Type | Internal (external override allowed) |
| Interfaz | SPI / QSPI / MICROWIRE compatible serial |
| Input Scaling Range (with external network) | Up to +/-10V (typ) |
| INL (B grade) | +/-1 LSB (max) |
| Rango de temperatura de funcionamiento | 0C to +70C (Commercial) |
| Encapsulado | 20-SSOP |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant |
| Nivel MSL | 1 (Unlimited) |
Configuración de pines de MAX1142BCAP+
| Pin 1 | DGND — Digital ground |
| Pin 2 | SCLK — Serial clock input |
| Pin 3 | DOUT — Serial data output (SPI MISO) |
| Pin 4 | SSTRB — Serial-strobe output (conversion complete) |
| Pin 5 | CS — Active-low chip-select input |
| Pin 6 | AIN — Analog input |
| Pin 7 | SHDN — Active-high shutdown control |
| Pin 8 | REF — Reference voltage input/output (+4.096V internal) |
| Pin 9 | REFGND — Reference ground |
| Pin 10 | AGND — Analog ground |
| Pin 11 | NC — Not connected (per datasheet) |
| Pin 12 | NC — Not connected (per datasheet) |
| Pin 13 | NC — Not connected (per datasheet) |
| Pin 14 | NC — Not connected (per datasheet) |
| Pin 15 | NC — Not connected (per datasheet) |
| Pin 16 | NC — Not connected (per datasheet) |
| Pin 17 | NC — Not connected (per datasheet) |
| Pin 18 | AGND — Analog ground |
| Pin 19 | DVDD — Digital +5V supply |
| Pin 20 | AVDD — Analog +5V supply |
Aplicaciones típicas
MAX1142BCAP+ es adecuado para 6 aplicacións: Industrial Process Control and Instrumentation, Current Sensing in Motor Control and Power Systems, Temperature and Pressure Monitoring with Bridge Sensors, Battery-Powered Data Loggers and Portable Instrumentation, Patient Monitoring and Medical Instrumentation, Automotive Sensor Interfaces.
Industrial Process Control and Instrumentation
The MAX1142BCAP+'s 14-bit resolution and 200 ksps sampling rate make it well-suited for industrial process control systems monitoring temperature, pressure, flow, and level signals from 4-20mA transmitters and bridge sensors. The on-chip +4.096V reference provides 1 mV/LSB scaling for direct engineering-unit display, while the +5V single-supply operation simplifies interface to legacy industrial PLC backplanes. Placed at the analog front-end after a current-shunt or instrumentation-amp stage, the MAX1142BCAP+ delivers sufficient resolution for closed-loop control and SCADA telemetry. Unlike slower 12-bit converters that quantize process variables too coarsely, the 14-bit architecture provides 16x more resolution for tighter setpoint accuracy in PID loops. The wide input scaling network supports +/-10V industrial signal conditioning without external op-amps.
Recomendado
Current Sensing in Motor Control and Power Systems
In motor-control and power-electronics designs, the MAX1142BCAP+ provides 14-bit accurate digitisation of shunt-resistor voltage drops for current-mode control and overcurrent protection. With its wide input scaling network, the part accepts +/-10V inputs directly, matching common shunt-amplifier output ranges. Placed after a current-sense amplifier (e.g., MAX4080 or MAX4170), the ADC delivers 200 ksps sampling for fast current-loop bandwidth in FOC (field-oriented control) and PFC (power factor correction) applications. The internal +4.096V reference enables direct ampere-per-LSB conversion after calibration. The 20-SSOP package fits compact 3-phase inverter PCB layouts. Compared with discrete ADC + external reference designs, the integrated reference reduces temperature-induced gain drift in harsh motor-drive environments.
Recomendado
Temperature and Pressure Monitoring with Bridge Sensors
Bridge sensors (load cells, strain gauges, and piezoresistive pressure transducers) require low-noise, high-resolution ADCs to extract small differential signals from common-mode bridge voltages. The MAX1142BCAP+ offers 14-bit resolution and 200 ksps throughput suitable for weighing scales, force-feedback systems, and altimeter/barometer designs. Combined with a low-noise instrumentation amplifier (e.g., MAX4194), the ADC's internal +4.096V reference drives the bridge excitation and provides ratiometric measurement that cancels reference drift. The SPI/QSPI/MICROWIRE-compatible serial interface enables direct connection to microcontrollers without glue logic. Unlike external-reference ADCs, the integrated reference eliminates the need for a separate low-drift reference IC, reducing BOM cost and PCB area in compact sensor modules.
Recomendado
Battery-Powered Data Loggers and Portable Instrumentation
Portable data loggers benefit from the MAX1142BCAP+'s +5V single-supply operation and the SHDN (shutdown) pin for power management between conversion bursts, achieving microampere-level current draw in sleep mode. The 200 ksps throughput supports multi-channel scanning via external analog multiplexers, allowing one ADC to time-share across multiple sensors in compact handheld instruments. The internal +4.096V reference eliminates a separate reference IC, reducing quiescent current and BOM cost - critical for battery-powered designs where every microampere matters. The 20-SSOP package offers small footprint for handheld enclosures. Compared with discrete ADC + reference designs, the integrated architecture extends battery life by 30-50% in typical duty-cycled measurement applications.
Recomendado
Patient Monitoring and Medical Instrumentation
Patient monitoring devices (pulse oximeters, ECG front-ends, infusion pumps, and blood-pressure monitors) require the high DC accuracy and low-noise performance of the MAX1142BCAP+. The 14-bit resolution and 200 ksps sampling rate capture the dynamic range of physiological signals from millivolt-level ECG traces to volt-level SpO2 photoplethysmograms. The internal +4.096V reference provides stable conversion for diagnostic-grade measurements. The SPI-compatible serial interface connects directly to medical MCUs without external glue. PLA or PEEK plastic enclosures with the 20-SSOP package meet medical-device PCB space constraints. The B-grade INL of +/-1 LSB ensures consistent calibration across production units, simplifying FDA 510(k) validation of measurement accuracy.
Recomendado
Automotive Sensor Interfaces
Automotive sensor modules (MAP, MAF, throttle position, oil-pressure, and coolant-temperature sensors) leverage the MAX1142BCAP+'s extended-industrial-grade variants for under-hood operation. The 14-bit resolution and 200 ksps throughput handle fast automotive control signals from engine and chassis ECUs. The wide input scaling network accepts +/-10V signals from common automotive sensor-output configurations. Placed at the analog-input stage of an ECU, the ADC provides sufficient resolution for closed-loop engine control, transmission shift scheduling, and ADAS sensor fusion. Compared with discrete ADC + reference designs, the integrated reference reduces temperature-induced drift across the -40C to +85C automotive temperature envelope. The 20-SSOP package withstands typical automotive PCB thermal-cycling profiles.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MAX1142BCAP+ — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MAX1142BEAP+ | MAX1142BCAP+T | MAX1142AEAP+ | MAX1143BCAP | MAX121CAP+ |
|---|---|---|---|---|---|---|
| Package | 20-SSOP | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Resolution | 14 Bit | 14 Bit | 14 Bit | 14 Bit | 12 Bit | 14 Bit |
| Sampling Rate | 200 ksps | 200 ksps | 200 ksps | 200 ksps | 200 ksps | 308 ksps |
| Supply Voltage | +5V single supply | +5V single supply | +5V single supply | +5V single supply | +5V single supply | +5V single supply |
| Internal Reference | +4.096V | +4.096V | +4.096V | +4.096V | +4.096V | +4.096V |
| Input Channels | 1 single-ended | 1 single-ended | 1 single-ended | 1 single-ended | 1 single-ended | 1 single-ended |
| Operating Temperature | 0C to +70C (Commercial) | -40C to +85C (Industrial) | 0C to +70C (Commercial) | -40C to +85C (Industrial) | 0C to +70C (Commercial) | 0C to +70C (Commercial) |
| Interface | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE |
| 1k Price (USD) | $5.70 | $8.50 | $5.70 | $8.20 | $4.50 | $9.10 |
Diferenciadores clave
- True 14-bit no-missing-codes performance with integrated +4.096V reference (frente a MAX1143BCAP)
- Direct SPI/QSPI/MICROWIRE interface without external logic (frente a MAX1142BCAP+T)
- Commercial temperature grade at $5.70/1k quantity pricing (frente a MAX1142BEAP+ (industrial))
Notas de diseño
The MAX1142BCAP+ requires clean +5V on both AVDD (pin 20) and DVDD (pin 19). Estimated: with 200 ksps continuous sampling, the part draws approximately 2.5 mA from AVDD and 1.5 mA from DVDD, totaling about 20 mW. Place a 10uF tantalum + 0.1uF ceramic bypass on AVDD adjacent to the pin, and a separate 0.1uF ceramic on DVDD to prevent digital switching noise from corrupting analog conversion. A ferrite bead between AVDD and DVDD supplies (or star-ground routing) further reduces digital-to-analog crosstalk. The SHDN pin (pin 7) reduces quiescent current to <10uA in sleep mode for battery-powered applications.
Route the analog input AIN (pin 6) on a top-layer trace surrounded by AGND (pin 10/18) ground pour to prevent digital-noise pickup. Keep the SPI traces (CS, SCLK, DOUT, SSTRB) on the opposite side of the PCB or on a layer below AGND to minimize capacitive coupling into the analog input. The REF pin (pin 8) requires a 4.7uF-10uF low-ESR ceramic or tantalum bypass to REFGND (pin 9) within 5mm to stabilize the internal +4.096V reference. Place NC pins (11-17) to AGND or leave floating - they are not internally bonded and have no electrical function.
Do not exceed the absolute maximum +6V on AVDD/DVDD - the part has no internal overvoltage protection. Avoid driving REF (pin 8) above AVDD or below AGND as this can permanently damage the internal reference cell. When using the input scaling network for +/-10V input range, the external resistors must be precision 0.1% thin-film (not 1% thick-film) to maintain 14-bit linearity - even small resistor mismatch introduces gain error and degrades INL. The SSTRB signal goes low when conversion starts, not high - read this carefully when writing SPI firmware to avoid sampling the wrong edge. Always wait at least one SCLK cycle after CS falls before driving SCLK.
The MAX1142BCAP+'s 14-bit resolution requires 16 LSB (1 LSB = 1mV with 4.096V reference) peak-peak noise for noise-free resolution. Estimated: with 10uF REF bypass and proper PCB layout, the part achieves approximately 13.5 effective bits at 200 ksps. To achieve full 14-bit noise-free resolution, reduce sampling rate to 100 ksps via the SHDN/idle duty cycle, or add a 2nd-order RC anti-aliasing filter on AIN before the ADC input. For multi-channel scanning via external MUX, allow 2us settling time after MUX channel switch before starting a new conversion (per datasheet settling specification).
Información de cumplimiento
RoHS compliant per "+" suffix designation. Not AEC-Q100 qualified - automotive applications requiring AEC-Q100 should use MAX1142BEAP+ industrial variant or external AEC-Q100 qualified ADCs. Halogen-free per Maxim Integrated product page declaration.
