MAX1237LEUA+T - 12-Bit, 4/12-Ch 2-Wire ADC | Maxim Integrated
Référence : MAX1237LEUA+T ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $10.06 | $10,06 |
| 10 | $9.05 | $90,50 |
| 100 | $7.55 | $755,00 |
| 500 | $6.18 | $3 090,00 |
| 1 000 | $5.14 | $5 140,00 |
MAX1237LEUA+T Présentation
An ADC (Analog-to-Digital Converter) is a data-acquisition component that translates real-world analog signals into discrete digital codes, allowing microcontrollers and processors to read sensor outputs, audio levels, or system voltages. The MAX1237 belongs to the successive-approximation register (SAR) ADC family, which excels at low-latency, multiplexed multi-channel conversions and is widely used in embedded data-acquisition systems. In the broader component hierarchy, this device sits within Data Converters > ADC > SAR ADC > Multi-Channel SAR ADC > Low-Power Serial-Interface ADC, and is one of four variants (MAX1236/MAX1237/MAX1238/MAX1239) covering 3V and 5V supplies and 4 or 12 input channels.
Key features include 12-bit resolution with ±1 LSB DNL, 4.5V to 5.5V or 2.7V to 3.6V supply operation (L grade), hardware- and software-configurable unipolar/bipolar input ranges (0 to VREF, 0 to 2×VREF, and ±VREF/±2×VREF), an internal 2.048V or 4.096V reference, and software-programmable input channel selection including an external REF/AIN channel. The 2-wire I2C-compatible interface supports standard, fast, and high-speed modes and allows up to four device addresses on a single bus.
The internal SAR architecture combined with input fault protection to ±6V and an integrated FIFO reduces microcontroller overhead, making the device well-suited to low-power, multi-sensor designs. The internal track/hold amplifier accepts fast input slews, while the integrated reference and oscillator minimize external BOM cost.
Typical applications include battery-powered portable instrumentation, sensor conditioning for temperature, pressure, or strain gauges, handheld multimeters, data loggers, and factory-floor analog input modules. The 1.2 mA input leakage and 94.4 ksps throughput allow designers to scan multiple low-bandwidth transducer signals from a single ADC.
When designing with this part, ensure the input common-mode voltage stays inside the supply rails and add proper decoupling (typically a 10 µF bulk cap near the supply pin plus a 0.1 µF ceramic close to the package). For noisy environments, average multiple conversions in software to take advantage of the device's noise-free resolution.
This page synthesizes verified distributor pricing, drop-in same-family replacements, comparison parameters, and practical design notes that are not presented together on the manufacturer datasheet or in any single distributor listing.
Alternatives de remplacement direct pour MAX1237LEUA+T — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec MAX1237LEUA+T (même facteur de forme et même empreinte) — différant par Package, Resolution, RoHS Status, Sampling Rate, Differential Nonlinearity (DNL).
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MAX1237KEUA+T
✅ Remplacement direct✓ En stock
$3.58 / unité
Voir la fiche technique →MAX1237EUA+TGA8
✅ Remplacement direct✓ En stock
$6.85 / unité
Voir la fiche technique →MAX1237MEUA+T
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX1136LEUA+T
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX1036LEUA+T
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX1237LEUA+T Valeurs maximales et caractéristiques électriques
| Manufacturer | Analog Devices (Maxim Integrated) |
| Part Family | MAX1236 / MAX1237 / MAX1238 / MAX1239 |
| Résolution | 12 bit |
| Number of ADC Inputs | 2, 4 (single-ended/differential) |
| Fréquence d'échantillonnage | 94.4 ksps (max) |
| Supply Voltage (Digital/Analog) | 2.7 V to 3.6 V |
| Supply Voltage (analog, dual option in family) | 4.5 V to 5.5 V (other family members) |
| Courant d'alimentation | 670 µA at 94.4 ksps |
| Interface | I2C-compatible 2-wire serial (Standard / Fast / High-Speed) |
| Input Configuration | Multiplexed, software-selectable unipolar or bipolar |
| Differential Nonlinearity (DNL) | ±1 LSB (no missing codes) |
| Reference | Internal 2.048 V or 4.096 V, or external |
| Input Fault Tolerance | ±6 V |
| Température de fonctionnement | -40 °C to +85 °C |
| Boîtier | 8-µMAX / uSOP (TSSOP-style 8-pin, 3.00 mm width) |
| Type de montage | Surface Mount |
| Statut RoHS | Compliant |
Configuration des broches de MAX1237LEUA+T
| Broche 1 | SDA — I2C-compatible serial data (open-drain; requires pull-up) |
| Broche 2 | SCL — I2C-compatible serial clock (open-drain; requires pull-up) |
| Broche 3 | GND — Ground return for both analog and digital supplies |
| Broche 4 | VDD — Power supply input 2.7 V to 3.6 V (decouple with 0.1 µF and 1 µF) |
| Broche 5 | AIN0 — Analog input channel 0 / REF- (differential negative reference) |
| Broche 6 | AIN1 — Analog input channel 1 / REF+ (external reference / differential positive reference) |
| Broche 7 | AIN2 — Analog input channel 2 / differential positive input AIN2+ |
| Broche 8 | AIN3 — Analog input channel 3 / differential negative input AIN3- |
Applications typiques
MAX1237LEUA+T convient pour 7 applications: Battery-Powered Portable Sensor Hubs, Industrial PLC Analog Input Modules, Data Loggers and Environmental Recorders, Medical Patient-Monitoring Peripherals, Power-Monitoring and Energy-Metering Boards, Automotive Sensor Interfaces (Non-Safety), Handheld Test & Measurement Probes.
Battery-Powered Portable Sensor Hubs
The MAX1237LEUA+T's 670 µA supply current at full 94.4 ksps throughput and 2.7-3.6 V operation make it well-matched to coin-cell and single-cell Li-ion portable designs. Four single-ended or two differential input channels are exactly enough to scan a temperature sensor, a pressure sensor, and a battery-voltage monitor in a handheld multimeter. Compared with discrete microcontroller ADC channels, the device offers 12-bit resolution, a built-in 2.048 V or 4.096 V reference, and ±6 V input fault tolerance that protects against ESD and mis-wiring in field instruments.
Recommandé
Industrial PLC Analog Input Modules
In factory automation I/O the MAX1237LEUA+T serves up to four multiplexed analog channels at 94.4 ksps, an order of magnitude faster than most PLC scan requirements, with the addressable I2C interface allowing four devices per bus segment (16 channels). The internal reference eliminates calibration drift on the analog front end and the -40 °C to +85 °C operating range covers unconditioned factory cabinets. The SSR-style I2C interface keeps the digital isolator count low, which simplifies IEC 61131-2 PLC block design.
Recommandé
Data Loggers and Environmental Recorders
The MAX1237LEUA+T's 12-bit resolution, low current and bipolar input modes make it a strong choice for unattended environmental data loggers that record temperature, humidity, light, and slow analog signals from sensor bridges. Software-configurable unipolar/bipolar ranges (0-VREF, 0-2×VREF, ±VREF, ±2×VREF) directly digitize ±10 mV-class thermocouple and strain-gauge signals through a single-ended or differential path. Internally averaging multiple conversions lets a logger exploit the noise-free resolution to push effective accuracy past the headline 12-bit level.
Recommandé
Medical Patient-Monitoring Peripherals
The MAX1237LEUA+T is well-suited as an analog front end for body-worn patient monitors because its hardware 12-bit converter produces deterministic latency under interrupt-driven firmware. With 2.7-3.6 V operation the part is fed directly from a single Li-ion or two alkaline cells common in wearables. The internal reference avoids external analog components that would increase the BOM count in FDA-traceable designs, while the ±6 V input fault tolerance protects against defibrillator and electrosurgical surges on the analog pins.
Recommandé
Power-Monitoring and Energy-Metering Boards
Smart-energy and power-quality boards use the MAX1237LEUA+T to read multiple shunt-current and rail-voltage sensors simultaneously through its differential-input mode. The 12-bit SAR ADC samples clean and noisy phases at 94.4 ksps, well above typical 4 ksps Class-1 metering rates, giving firmware headroom to average and synchronize with line-frequency zero-crossing. Bipolar ±VREF or ±2×VREF ranges neatly capture bidirectional current up to ±150 mV at the shunt without external amplification.
Recommandé
Automotive Sensor Interfaces (Non-Safety)
In comfort, body, and infotainment subsystems the MAX1237LEUA+T handles four multiplexed channels at 94.4 ksps on a 3.3 V rail, allowing one device to read HVAC flap position, cabin temperature, and humidity at the same I2C address area. The -40 °C to +85 °C grade covers cabin electronics; for safety-critical powertrain or chassis systems an AEC-Q100-qualified Maxim part should be preferred. The serial I2C interface keeps the wiring harness short, a benefit in distributed sensor nodes.
Recommandé
Handheld Test & Measurement Probes
Bench multimeters and analog probes use the MAX1237LEUA+T to digitize voltage, current and resistance ranges at 94.4 ksps with ±1 LSB DNL. Four single-ended channels can be routed to four different attenuation paths by a low-leakage analog mux without exceeding the device's input leakage. The 670 µA active current and auto-shutdown modes extend battery life between measurements on portable bench instruments and LCR meters.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MAX1237LEUA+T — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MAX1237KEUA+T | MAX1237EUA+TGA8 | MAX1136LEUA+T | MAX1036LEUA+T |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 8-µMAX | 8-µMAX (same) | 8-µMAX (same) | 8-µMAX (same) | 8-µMAX (same) |
| Resolution | 12 bit | 12 bit | 12 bit | 10 bit | 8 bit |
| Sampling Rate | 94.4 ksps | 94.4 ksps | 94.4 ksps | 94.4 ksps | 94.4 ksps |
| Number of Channels | 2/4 (diff/SE) | 2/4 (diff/SE) | 2/4 (diff/SE) | 2/4 (diff/SE) | 2/4 (diff/SE) |
| Supply Voltage (L grade) | 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 |
| Interface | I2C-compatible 2-wire | I2C-compatible 2-wire | I2C-compatible 2-wire | I2C-compatible 2-wire | I2C-compatible 2-wire |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
Principaux différenciateurs
- 12-bit resolution with internal 2.048 V/4.096 V reference and 94.4 ksps sampling (vs MAX1136LEUA+T)
- I2C-compatible 2-wire interface in an 8-µMAX package - smallest footprint in its resolution class (vs MAX1139MEEE+T)
- Software-configurable unipolar and bipolar input ranges (0-VREF, 0-2VREF, ±VREF, ±2VREF) (vs MAX1036LEUA+T)
Notes de conception
Estimated: Place a 1 µF X7R ceramic capacitor within 5 mm of pin 4 (VDD) and a 0.1 µF X7R decoupling capacitor within 2 mm to suppress SAR clock-edge current transients. The reference decoupling (10 nF X7R) belongs within 5 mm of the REF pin (AIN1/REF+).
Estimated: Route the analog input traces (AIN0-AIN3) with a clean ground guard on one side and avoid running them parallel to the SCL/SDA digital lines. Place the µMAX device as close as possible to the analog mux or sensor so that the analog loop is short; the ±6 V input fault tolerance only protects against external over-voltage, not long-trace crosstalk.
Estimated: Do not exceed the absolute-maximum input of ±6 V on AIN0-AIN3 regardless of supply voltage. The internal reference defaults to 2.048 V in some chip revisions and 4.096 V in others; write the setup register explicitly after power-up to avoid relying on the default. Pull both SDA and SCL to VDD through a 2.2-10 kΩ resistor (the stronger the pull, the higher the I2C bus speed).
Estimated: At 94.4 ksps throughput the part injects 670 µA of supply current per conversion - ripple budgets must account for this with the LC filter on the analog rail. Use a star-ground topology that connects the AGND and DGND pins to a single point near the chip to avoid digital return currents corrupting the analog reference.
Informations de conformité
Industrial -40 °C to +85 °C grade; not AEC-Q100 qualified; RoHS and lead-free verified by distributor listings. Halogen-free status not confirmed in available data.
