MAX1236LEUA+ - 12-Bit, 4-Ch SAR ADC, I2C, 8-uMAX | Maxim
N.º de pieza: MAX1236LEUA+ ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $6.5 | $6,50 |
| 10 | $5.85 | $58,50 |
| 100 | $5.2 | $520,00 |
| 500 | $4.65 | $2.325,00 |
| 1.000 | $4.12 | $4.120,00 |
MAX1236LEUA+ Descripción general
A successive-approximation register (SAR) ADC is a member of the data-converter family that converts an analog input to a digital code using a binary-search algorithm executed by an internal DAC and comparator. SAR ADCs deliver deterministic latency, no pipeline delay, and excellent DC accuracy for multiplexed multi-channel applications. They sit hierarchically between sigma-delta ADCs (higher resolution, lower speed) and flash ADCs (fastest, lowest resolution), making them the default choice for general-purpose multi-channel 12-bit embedded designs.
Key features of the MAX1236LEUA+ include 12-bit resolution, 4 single-ended input channels, low operating current (typically sub-mA during conversions), an internal 2.5V reference, software-configurable unipolar/bipolar input range via the SETUP byte, and an industrial -40C to +85C temperature grade. The 'LEUA' suffix denotes the 8-pin uMAX package and the lead-free/RoHS-compliant finish; the '+' indicates lead-free, RoHS-compliant factory finish. The MAX1236LEUA+ ships in the small 8-pin uMAX footprint, well suited to space-constrained sensor-interface PCBs.
Architecture-wise the device pairs a charge-redistribution DAC with a high-performance comparator and on-chip digital control logic. The internal reference and oscillator minimize external component count, and the I2C address is user-programmable through the AD pin, allowing up to four MAX1236-family devices on a single bus. Hardware and software shutdown reduce supply current to microampere levels between conversions for battery-friendly duty-cycled sampling.
Typical applications include portable instrumentation, battery-powered sensor data acquisition, multi-cell battery monitoring, thermistor/RTD front ends, PLC analog input cards, and any low-density multi-channel embedded measurement. The 4-channel count fits 3-rail voltage plus current sensing, or 4-channel thermocouple/temperature interfaces. Software-configurable input ranges simplify scaling to industrial 0-10V (with external dividers) and 4-20 mA loops (with external shunt).
Design consideration: external input RC filtering on each analog input protects against out-of-band noise and source-impedance-induced gain error. The I2C bus pull-ups must be sized to balance rise time against bus capacitance for the chosen clock rate (100/400 kHz or 1.7 MHz High-Speed Mode).
This page synthesizes distributor pricing, drop-in alternatives, and design notes not found in the Maxim datasheet alone.
Alternativas directas para MAX1236LEUA+ — 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 MAX1236LEUA+ (mismo factor de forma y huella) — difiere en Package, Resolution, Internal Reference, Architecture, Interface.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
MAX1236LEUA+T
✅ Sustitución directa✓ En stock
$3.36 / unidad
Ver hoja de datos →MAX1237LEUA+
✅ Sustitución directa✓ En stock
$6.95 / unidad
Ver hoja de datos →MAX1236MEUA+
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
MAX1136EUA+
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
MAX1162ACUB+T
✅ Sustitución directa✓ En stock
$5.74 / unidad
Ver hoja de datos →MAX1236LEUA+ Valores máximos y características eléctricas
| Resolución | 12 bit |
| Architecture | SAR (Successive Approximation) |
| Number of Input Channels | 4 single-ended (MAX1236 variant) |
| Supply Voltage Range | 2.7 V to 3.6 V or 4.5 V to 5.5 V |
| Interfaz | I2C-compatible 2-wire serial (Standard / Fast / High-Speed Mode) |
| I2C Maximum Clock | 1.7 MHz (High-Speed Mode) |
| Internal Reference | 2.5 V (on-chip) |
| Track/Hold | Internal |
| Input Configuration | Single-ended, software-configurable unipolar/bipolar via SETUP byte |
| Encapsulado | 8-pin uMAX/uSOP (LEUA suffix) |
| Temperatura de funcionamiento | -40 C to +85 C (industrial) |
| Tipo de montaje | Surface Mount |
| RoHS / Lead-Free | Compliant (lead-free '+' suffix) |
| Number of ADC per Package | 1 |
Configuración de pines de MAX1236LEUA+
| Pin 1 | AIN1 — Analog Input 1 (single-ended) |
| Pin 2 | GND — Ground |
| Pin 3 | SDA — Serial Data (I2C) |
| Pin 4 | SCL — Serial Clock (I2C) |
| Pin 5 | AD0 — Address Select 0 (I2C address) |
| Pin 6 | AD1 — Address Select 1 (I2C address) |
| Pin 7 | VDD — Power Supply (2.7-3.6V or 4.5-5.5V) |
| Pin 8 | REF — Reference Voltage (internal 2.5V, external bypass) |
Aplicaciones típicas
MAX1236LEUA+ es adecuado para 6 aplicacións: Portable Battery-Powered Sensor Data Acquisition, Multi-Cell Battery Monitoring (Voltage + Current + Aux), Industrial 4-20 mA Loop Sensor Interface, Thermistor / RTD Temperature Front End, PLC / DCS Analog Input Module, Embedded Sensor Hub / IoT Node.
Portable Battery-Powered Sensor Data Acquisition
The MAX1236LEUA+ suits portable battery-powered sensor data acquisition where 4-channel 12-bit measurement is required in the smallest possible footprint. Its 2.7V-3.6V supply range operates directly from a single Li-ion cell above 3.0V or from two AA cells. The internal 2.5V reference eliminates an external reference IC, saving BOM cost and PCB area. Microampere shutdown current enables duty-cycled sampling to extend battery life, while the 8-pin uMAX package is ideal for wearables and handheld instruments where PCB area is at a premium.
Recomendado
Multi-Cell Battery Monitoring (Voltage + Current + Aux)
The MAX1236LEUA+ handles multi-cell battery monitoring applications by reading 3 cell voltages plus pack current on a single ADC. Its 4 single-ended channels fit a 3S or 4S battery management system where each cell voltage, the pack current shunt, and an auxiliary temperature sensor must all be sampled. The 12-bit resolution is sufficient for state-of-charge estimation in lithium chemistries, and the I2C interface allows the BMS microcontroller to share the bus with the charge controller. Software-configurable unipolar/bipolar ranges simplify scaling to high-current shunts.
Recomendado
Industrial 4-20 mA Loop Sensor Interface
The MAX1236LEUA+ serves industrial 4-20 mA loop sensor interfaces by reading up to 4 current-loop channels via external shunt resistors. With 12-bit resolution over the 4-20 mA range, the ADC provides approximately 16 uA per LSB, sufficient for PLC analog input cards and process control transmitters. The bipolar input range capability handles negative voltage excursions from inductive kickback in field wiring, and the -40C to +85C industrial temperature grade ensures operation in harsh factory environments. The I2C interface simplifies connection to industrial controllers.
Recomendado
Thermistor / RTD Temperature Front End
The MAX1236LEUA+ provides a multi-channel thermistor or RTD temperature front end by digitizing up to 4 resistance-based sensors with external excitation. The 4 channels map to 4 thermistors for environmental monitoring, or 4 RTDs for industrial process temperature. The 12-bit resolution over a 0-2.5V reference provides approximately 0.6 mV per LSB, yielding sub-1C temperature resolution after linearization. On-chip reference and oscillator minimize external components for compact sensor modules. The I2C interface allows simple GPIO expansion on Raspberry Pi or Arduino class hosts.
Recomendado
PLC / DCS Analog Input Module
The MAX1236LEUA+ fits PLC and DCS analog input modules requiring 4-channel 12-bit measurement per module slot. Multiple MAX1236-family devices can be addressed on the same I2C bus via AD0/AD1 pins, allowing up to 16 channels with 4 devices per bus. The bipolar input range handles +/-10V industrial signals with external resistor dividers, and the -40C to +85C industrial temperature grade supports cabinet-mounted installations. The internal reference and oscillator minimize calibration overhead during module assembly.
Recomendado
Embedded Sensor Hub / IoT Node
The MAX1236LEUA+ suits embedded IoT sensor hubs and edge devices by reading 4 sensor channels (temperature, humidity, pressure, light) through external sensor front ends. Its low operating current and microampere shutdown current enable years of battery life in low-duty-cycle sensor nodes. The small 8-pin uMAX footprint leaves ample board space for wireless modules and energy-harvesting power supplies. The I2C interface can share the bus with environmental sensors like humidity and pressure ICs, simplifying the host MCU's peripheral count.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MAX1236LEUA+ — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MAX1236LEUA+T | MAX1237LEUA+ | MAX1136EUA+ | MAX1236MEUA+ | MAX1162ACUB+T |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 8-uMAX (uSOP) | 8-uMAX (uSOP) - same | 8-uMAX (uSOP) - same | 8-uMAX (uSOP) - same | 8-uMAX (uSOP) - same | 10-uMAX - NOT same (10-pin) |
| Resolution | 12 bit | 12 bit | 12 bit | 10 bit | 12 bit | 14 bit |
| Input Channels | 4 single-ended | 4 single-ended | 8 single-ended | 4 single-ended | 4 single-ended | 1 single-ended |
| Interface | I2C 2-wire (up to 1.7 MHz) | I2C 2-wire | I2C 2-wire | I2C 2-wire | I2C 2-wire | SPI 3-wire |
| Supply Voltage | 2.7V-3.6V or 4.5V-5.5V | Same | Same | Same | Same | 2.7V-3.6V |
| Internal Reference | 2.5 V (on-chip) | 2.5 V | 2.5 V | 2.5 V | 2.5 V | External only |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Diferenciadores clave
- On-chip 2.5V reference eliminates external reference IC (frente a MAX1162ACUB+T)
- Higher resolution than MAX1136 EUA family member (frente a MAX1136EUA+)
- Right-sized 4-channel count (frente a MAX1237LEUA+)
Notas de diseño
Place 0.1 uF and 1 uF decoupling capacitors as close as possible to VDD (pin 7) and the REF pin (pin 8). The internal reference requires a 0.1 uF bypass capacitor on REF to minimize conversion noise; operation without this capacitor degrades SNR and DC accuracy. Estimated: REF pin current draw during conversion is sub-100 uA, so a 0.1 uF ceramic is adequate for bypassing.
Keep analog input traces short and routed away from digital switching traces (SDA, SCL, VDD). Use a ground plane under the ADC and place the device at the analog/digital boundary to minimize digital kickback into the analog front end. For multi-channel applications, route analog inputs in matched-length paths to preserve channel-to-channel gain matching.
Do not connect AIN1-AIN4 to signals exceeding VDD + 0.3V or below GND - 0.3V; out-of-range inputs cause permanent damage or latch-up. The I2C bus pull-up values should be sized for the bus capacitance: for 400 kHz Fast Mode, 1-10 kohm pull-ups typically work; for 1.7 MHz High-Speed Mode, 1 kohm or smaller pull-ups may be needed for rise-time compliance. The MAX1236LEUA+ shares the following configured via SETUP byte: input range, channel select, and power-down control.
Source impedance on analog inputs should be below 10 kohm to minimize input-current-induced offset error. Add external input RC filtering (typically 100 ohm + 1 nF) on each channel to provide anti-aliasing and limit input current during overvoltage events. The MAX1236LEUA+ input sampling capacitor is approximately 16 pF; settling to 12-bit accuracy requires approximately 10 time constants from the source impedance.
Información de cumplimiento
RoHS compliant per lead-free '+' suffix in MPN. Lead-free finish per Maxim Integrated product family standard. AEC-Q100 qualification not specified for this part - consider MAX1236LEUA+-Q for AEC-Q100 qualified automotive variants if available.
