MAX1237KEUA+T - 12-Bit 4-Ch SAR ADC, I2C, 8-uMAX | Maxim
N.º de pieza: MAX1237KEUA+T ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $5.62 | $5,62 |
| 10 | $5.05 | $50,50 |
| 100 | $4.49 | $449,00 |
| 500 | $4.02 | $2.010,00 |
| 1.000 | $3.58 | $3.580,00 |
MAX1237KEUA+T Descripción general
A SAR ADC is a type of analog-to-digital converter that uses a binary-search successive-approximation register and an internal DAC to digitize an analog input one bit per clock cycle. SAR ADCs are valued for low-latency conversions, deterministic acquisition time, and excellent DC accuracy. As a low-power multi-channel SAR ADC with an integrated reference, the MAX1237 belongs to the hierarchy: SAR ADC -> data converter -> mixed-signal IC -> semiconductor.
Key features include 12-bit resolution, 2 or 4 single-ended / 1 or 2 differential input channels (software configurable), 94.4 ksps maximum sampling rate, 2.7 V to 3.6 V digital supply (compatible with 1.8 V/2.5 V/3.3 V logic) and 4.5 V to 5.5 V analog supply (MAX1236/MAX1237) - note the MAX1238/MAX1239 in this family share the same 8-pin uMAX package but differ in channel count and supply arrangement. The internal 2.048 V reference provides ratiometric or absolute conversion with 1 LSB INL and 1 LSB DNL (typical). The I2C interface supports standard (100 kHz), fast (400 kHz), and high-speed (3.4 MHz) modes.
Typical applications include 4-20 mA industrial sensor digitizing, hand-held instrumentation, portable battery-powered data loggers, PLC analog input modules, HVAC sensor boards, and consumer-grade medical devices. The wide supply tolerance lets the part share analog and digital rails on common 5 V/3.3 V industrial backplanes.
When designing with this ADC, place a 10 uF decoupling capacitor adjacent to AVDD and a 1 uF capacitor adjacent to DVDD to keep reference and converter noise off the conversion result. The REF pin requires a minimum 1 uF external bypass capacitor for stability; do not omit it.
Alternativas directas para MAX1237KEUA+T — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con MAX1237KEUA+T (mismo factor de forma y huella) — difiere en Package, Input Type, Operating Temperature Range, Sampling Rate, Internal Reference.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
MAX1237EUA+TGA8
✅ Sustitución directa✓ En stock
$6.85 / unidad
Ver hoja de datos →MAX1237LEUA+
✅ Sustitución directa✓ En stock
$6.95 / unidad
Ver hoja de datos →MAX1236KEUA+T
✅ Sustitución directa✓ En stock
$3.55 / unidad
Ver hoja de datos →MAX1237KEUA+
✅ Sustitución directa✓ En stock
$4.49 / unidad
Ver hoja de datos →MAX1137KEUA+T
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX1136KEUA+T
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MAX1237KEUA+T Valores máximos y características eléctricas
| Resolución | 12 bits |
| Architecture | SAR (Successive Approximation Register) |
| Number of Input Channels | 2 or 4 single-ended / 1 or 2 differential (software-configurable) |
| Frecuencia de muestreo | 94.4 ksps max |
| Input Type | Single-ended / pseudo-differential |
| Analog Supply Voltage (AVDD) | 4.5 V to 5.5 V (MAX1236/MAX1237) |
| Digital Supply Voltage (DVDD) | 2.7 V to 3.6 V |
| Digital Logic Compatibility | 2.7 V / 3.3 V |
| Tensión de referencia | 2.048 V internal (4.096 V with external REF applied to MAX1238/MAX1239) |
| Integral Nonlinearity (INL) | ±1 LSB (typical) |
| Differential Nonlinearity (DNL) | ±1 LSB (typical) |
| Serial Interface | I2C-compatible 2-wire (Standard 100 kHz, Fast 400 kHz, High-Speed 3.4 MHz) |
| Encapsulado | 8-pin uMAX / uSOP (3.00 mm) |
| Rango de temperatura de funcionamiento | -40C to +85C (industrial, K suffix) |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant |
| Channel/Sample Architecture | 1 SAR, 2/4 input mux |
Configuración de pines de MAX1237KEUA+T
| Pin 1 | SCL — Serial clock input (I2C) |
| Pin 2 | SDA — Serial data I/O (I2C, open-drain) |
| Pin 3 | AIN1 — Analog input 1 |
| Pin 4 | AIN2/AIN0- — Analog input 2 (single-ended) or AIN0- (differential negative) |
| Pin 5 | AIN3/AIN1- — Analog input 3 (single-ended) or AIN1- (differential negative) |
| Pin 6 | REF — Internal 2.048 V reference; bypass with 1 uF to AGND |
| Pin 7 | DVDD — Digital supply (2.7 V to 3.6 V) |
| Pin 8 | AVDD — Analog supply (4.5 V to 5.5 V); AGND is the exposed pad |
Aplicaciones típicas
MAX1237KEUA+T es adecuado para 7 aplicacións: Industrial 4-20 mA Sensor Digitization, Hand-Held Portable Instrumentation, PLC Analog Input Module, HVAC Environmental Sensor Board, Consumer Medical Monitoring Device, IoT Sensor Node Edge Digitization, Automotive Sensor Interface Module.
Industrial 4-20 mA Sensor Digitization
The MAX1237KEUA+T is well suited for digitizing 4-20 mA current-loop sensors in industrial automation systems. Its 4 single-ended input channels allow direct connection to up to 4 sensor outputs through a current-sense resistor, while the 12-bit resolution provides approximately 0.024 percent full-scale precision - enough to resolve 4-20 mA in 5 microamp steps. The 4.5-5.5 V analog supply matches common 24 V-to-5 V industrial backplane rails, and the -40C to +85C industrial temperature grade meets the operating envelope of factory-floor equipment.
Recomendado
Hand-Held Portable Instrumentation
For battery-powered handheld multimeters and data loggers, the MAX1237KEUA+T delivers low power dissipation (approximately 1.2 mW at 10 ksps) plus a shutdown mode that drops consumption to less than 1 microampere, preserving battery life between measurement cycles. The internal 2.048 V reference eliminates an external reference IC, saving PCB area in handheld enclosures. The I2C interface requires only 2 MCU pins, leaving more GPIO available for the keypad, display, and user interface.
Recomendado
PLC Analog Input Module
In Programmable Logic Controller (PLC) analog input modules, the MAX1237KEUA+T provides a compact multi-channel digitization solution that interfaces directly to 3.3 V PLC CPUs over its I2C bus. The 94.4 ksps sampling rate supports the typical 100-1000 Hz update rates used in process control loops. The 8-pin uMAX footprint is significantly smaller than traditional PLC analog input ICs, allowing higher channel density on the analog front-end PCB. The internal reference simplifies factory calibration and reduces BOM.
Recomendado
HVAC Environmental Sensor Board
The MAX1237KEUA+T is appropriate for HVAC environmental sensor boards that combine temperature, humidity, and air-quality measurements in a single multi-channel ADC. With 4 single-ended channels, the part can digitize a thermistor, a humidity sensor, a CO2 sensor output, and a pressure sensor simultaneously. The industrial -40C to +85C temperature range covers rooftop and basement HVAC installations. The internal reference and integrated track/hold simplify the analog front-end, reducing sensor board BOM cost.
Recomendado
Consumer Medical Monitoring Device
For consumer-grade medical monitors such as blood-pressure cuffs, pulse oximeters, and body composition analyzers, the MAX1237KEUA+T provides 12-bit resolution sufficient for heart-rate and respiration waveform digitization. The 4-channel input allows simultaneous measurement of multiple physiological signals - e.g., pulse oximetry red and IR LEDs, plus a temperature sensor for body temperature compensation. The integrated reference and 8-pin uMAX package keep the analog front-end small, which is critical for wearable form factors.
Recomendado
IoT Sensor Node Edge Digitization
In IoT sensor nodes and edge-computing devices, the MAX1237KEUA+T provides on-board multi-channel digitization before wireless transmission, reducing MCU wake-time and overall system power. The I2C interface integrates seamlessly with common IoT microcontrollers, and the 4-channel input lets a single node digitize temperature, humidity, motion, and ambient light sensors. The internal reference and shutdown mode (less than 1 microampere) support the duty-cycled power profile required for multi-year battery life.
Recomendado
Automotive Sensor Interface Module
In non-safety automotive body electronics such as HVAC control, seat-position sensing, and ambient interior sensors, the MAX1237KEUA+T provides a low-cost multi-channel ADC solution. Note that for AEC-Q100 qualified automotive applications, an upgraded AEC-Q100 certified part must be substituted. The 4-channel input allows a single ADC IC to handle multiple sensor inputs from a body controller module, and the wide industrial temperature range covers most cabin and under-hood-adjacent environments.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MAX1237KEUA+T — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MAX1237EUA+T | MAX1237LEUA+ | MAX1236KEUA+T | MAX1237KEUA+ | MAX1137KEUA+T | MAX1136KEUA+T |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices / Maxim Integrated | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 8-uMAX/uSOP | 8-uMAX/uSOP - same | 8-uMAX/uSOP - same | 8-uMAX/uSOP - same | 8-uMAX/uSOP - same | 8-uMAX/uSOP - same | 8-uMAX/uSOP - same |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 10 bits | 10 bits |
| Input Channels (single-ended) | 2 or 4 | 2 or 4 | 2 or 4 | 4 | 2 or 4 | 2 or 4 | 4 |
| Sampling Rate | 94.4 ksps | 94.4 ksps | 94.4 ksps | 94.4 ksps | 94.4 ksps | 94.4 ksps | 94.4 ksps |
| Analog Supply (AVDD) | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V |
| Digital Supply (DVDD) | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V | 2.7 V to 3.6 V |
| Temperature Range | -40C to +85C (K suffix) | 0C to +70C | 0C to +70C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Reference | Internal 2.048 V | Internal 2.048 V | Internal 2.048 V | Internal 2.048 V | Internal 2.048 V | Internal 2.048 V | Internal 2.048 V |
| Interface | I2C (up to 3.4 MHz) | I2C (up to 3.4 MHz) | I2C (up to 3.4 MHz) | I2C (up to 3.4 MHz) | I2C (up to 3.4 MHz) | I2C (up to 3.4 MHz) | I2C (up to 3.4 MHz) |
Diferenciadores clave
- Industrial temperature grade (-40C to +85C) (frente a MAX1237EUA+T)
- 12-bit resolution over 10-bit MAX1136/MAX1137 family (frente a MAX1137KEUA+T)
- Internal 2.048 V reference eliminates external ref IC (frente a MAX1238/MAX1239 external reference designs)
Notas de diseño
Decouple AVDD with a 10 microfarad tantalum or ceramic bulk capacitor in parallel with a 0.1 microfarate ceramic placed within 5 millimeters of the AVDD pin. Decouple DVDD similarly with 1 microfarad bulk and 0.1 microfarate ceramic. For PCB layouts with multiple ADC devices, use a star-ground topology to prevent digital return currents from flowing through the analog ground plane and corrupting the conversion result.
Route the SDA and SCL traces as differential pair or as parallel traces with matched length, kept under 10 centimeters to maintain signal integrity at high-speed 3.4 MHz mode. Place 4.7 kilohm pull-up resistors on both SDA and SCL close to the master MCU. Keep the I2C traces away from switching power inductors or clock signals to avoid coupling into the ADC reference and corrupting conversions.
Always bypass the REF pin with a minimum 1 microfarate low-ESR ceramic capacitor directly to AGND - omitting this capacitor causes reference instability and degraded conversion accuracy. Do not exceed the absolute maximum analog input voltage of AVDD plus 0.3 V; inputs beyond this range can damage the input protection diodes. After power-up, allow 10 milliseconds for the internal reference to stabilize before initiating conversions.
Información de cumplimiento
RoHS compliant per Maxim Integrated product page. Lead-free reflow-compatible. AEC-Q100 not qualified - for AEC-Q100 automotive applications substitute MAX11136ATB+T or similar qualified part. The internal reference provides 50 ppm/C typical drift suitable for industrial temperature environments.
