MAX1236LEUA+T - 12-Bit 4-Ch 94ksps SAR ADC I2C | Maxim
부품 번호: MAX1236LEUA+T ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $6.4 | $6.40 |
| 10 | $5.76 | $57.60 |
| 100 | $4.62 | $462.00 |
| 500 | $3.92 | $1,960.00 |
| 1,000 | $3.36 | $3,360.00 |
MAX1236LEUA+T 개요
What is an SAR ADC: A successive-approximation register analog-to-digital converter is a type of low-to-medium speed, medium-resolution data converter that performs a binary search through an internal DAC to digitize an analog input one bit per clock cycle. SAR ADCs sit in the broader taxonomy of data converters (ADC -> data converter -> signal chain -> mixed-signal IC -> semiconductor). They are prized for deterministic latency, no-pipeline delay, excellent DC accuracy, and very low power consumption relative to pipeline or delta-sigma ADCs at similar speeds.
Key features include 12-bit resolution with no missing codes, ±1 LSB INL/DNL (max), an internal 2.5V reference (also accepting an external reference), a software-configurable unipolar/bipolar analog input range (0 to VREF or ±VREF), low 1.5 mA power-down current, and a hardware/software shutdown mode that drops quiescent current to microampere levels. The I2C interface supports standard (100 kHz), fast (400 kHz), and high-speed (3.4 MHz) modes, simplifying connection to virtually any modern microcontroller.
The MAX1236LEUA+T uses a charge-redistribution DAC architecture with an input track/hold, ensuring accurate sampling of fast-moving signals and providing inherent single-cycle conversion. An on-chip 2.5V bandgap reference is trimmed at final test, eliminating external reference components and reducing BOM cost and board area. The device is specified over the -40°C to +85°C industrial temperature range.
Typical applications include portable data acquisition, patient monitoring and medical instrumentation, process control loops, battery-powered sensor reading, plus battery monitoring on 4-cell battery stacks. The integrated reference and small µMAX footprint also suit space-constrained designs where a 4-channel SAR ADC must coexist with a small microcontroller.
Design consideration: route the I2C SDA/SCL traces with 4.7 kΩ pull-ups and place a 0.1 µF decoupling capacitor within 5 mm of the AVDD pin; the analog inputs are sample-and-hold based, so adding a small RC (typically 100 Ω + 100 pF) at AIN pins reduces kickback.
This page synthesizes distributor pricing, drop-in same-package alternatives, application-specific design notes, and selection guidance that is not present in the bare manufacturer datasheet.
드롭인 대체품: MAX1236LEUA+T — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: MAX1236LEUA+T (동일 폼 팩터 및 풋프린트) — 차이점: Package, Resolution, Interface, Architecture, RoHS Status.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
MAX1236LEUA+
✅ 드롭인✓ 재고 있음
$4.12 / 개
데이터시트 보기 →MAX1238LEUA+T
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX1239LEUA+T
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX116EAX+T
✅ 드롭인✓ 재고 있음
$9.62 / 개
데이터시트 보기 →MAX1162ACUB+T
✅ 드롭인✓ 재고 있음
$5.74 / 개
데이터시트 보기 →MAX1236LEUA+T 최대 정격 & 전기적 특성
| 분해능 | 12 bit |
| Number of Channels | 4 single-ended / 2 differential (2 input) |
| Conversion Architecture | SAR (Successive Approximation) |
| Sampling Rate (max) | 94.4 ksps |
| Supply Voltage (AVDD) | 4.5 V to 5.5 V |
| Supply Current (full speed) | 670 µA |
| Internal Reference | 2.5 V |
| External Reference Input | Yes (REF pin) |
| INL (max) | ±1 LSB |
| DNL (max) | ±1 LSB |
| 인터페이스 | I2C-compatible 2-wire serial (Standard / Fast / High-Speed) |
| 동작 온도 | -40 °C to +85 °C |
| 패키지 | 8-pin µMAX (uSOP) |
| 실장 유형 | Surface Mount |
| RoHS 상태 | Compliant |
| Lead Free | Yes |
MAX1236LEUA+T 핀 구성
| 핀 1 | AIN0 — Analog input channel 0 (single-ended) or positive differential input |
| 핀 2 | AIN1 — Analog input channel 1 (single-ended) or negative differential input |
| 핀 3 | AIN2 — Analog input channel 2 / auxiliary analog input |
| 핀 4 | GND — Ground |
| 핀 5 | AVDD — Analog supply (4.5 V to 5.5 V); decouple with 0.1 µF + 10 µF to GND |
| 핀 6 | SDA — I2C serial data (open-drain; pull up to AVDD or external logic supply) |
| 핀 7 | SCL — I2C serial clock (open-drain; pull up to AVDD or external logic supply) |
| 핀 8 | REF — Voltage reference input/output (internal 2.5 V or external overdrive) |
일반적인 애플리케이션
MAX1236LEUA+T 적합 용도: 6 애플리케이션s: Portable Data Acquisition, Industrial Process Control Sensors, Battery Monitoring and Fuel Gauging, Patient Monitoring and Medical Instrumentation, Rack-Mount Sensor Interface Cards, IoT Sensor Hubs and Edge Nodes.
Portable Data Acquisition
The MAX1236LEUA+T fits portable data-acquisition modules because its 670 µA full-speed supply current at 5V keeps battery drain low while the 94.4 ksps throughput digitizes multi-axis sensors in real time. Place the part between the sensor bridge and the MCU's I2C bus with a 0.1 µF AVDD decoupling cap within 5 mm of pin 5; the internal 2.5V reference eliminates the external reference IC that would otherwise inflate BOM cost. Unlike higher-speed pipeline ADCs it adds zero pipeline latency, so each conversion result is available the same cycle it was sampled, simplifying deterministic logger firmware. The µMAX 8-pin footprint drops into a 3 mm × 3 mm PCB area, leaving room for additional analog signal conditioning around the ADC in space-constrained handheld designs.
추천
Industrial Process Control Sensors
In process-control loops the MAX1236LEUA+T digitizes 4–20 mA-derived voltage signals from pressure, flow, and temperature transducers with ±1 LSB INL, ensuring loop accuracy is limited by the sensor rather than the ADC. The 4 single-ended input channels handle multiple sensor bridges sequentially under MCU firmware control, sharing one ADC across a multi-loop PLC front panel. Connect each analog input through a 100 Ω + 100 pF RC anti-alias filter to suppress input kickback on the internal track/hold; the 4.5–5.5V supply matches standard 24V-bus-derived 5V rails common in industrial PLCs. The -40 °C to +85 °C industrial temperature grade and integrated reference reduce calibration drift in factory-floor installations.
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Battery Monitoring and Fuel Gauging
The MAX1236LEUA+T is well suited for 4-cell battery-stack voltage monitoring because it accepts a 5V analog supply while digitizing cell voltages up to the internal 2.5V reference (or higher via external reference overdrive). Place a resistive divider on each AIN input to scale cell voltages into the ADC's input range, then sequence conversions through the I2C setup register; the hardware shutdown pin drops quiescent current to microampere levels between samples to extend standby life. The integrated track/hold and 12-bit resolution give 1 mV-class measurement resolution on a 4.2V Li-ion cell, adequate for coulomb-counting fuel-gauge ICs. The µMAX package occupies minimal board area inside battery-management boards.
추천
Patient Monitoring and Medical Instrumentation
In patient monitors the MAX1236LEUA+T digitizes signals from ECG, SpO2, temperature, and respiration sensors that require 12-bit resolution and low power consumption to maximize battery runtime on portable carts or wearable patches. The 4 single-ended inputs let one ADC service multiple physiological channels, sharing one I2C bus with the host MCU; the integrated 2.5V reference removes an external precision reference that would otherwise complicate IEC 60601-1 leakage budgets. Power consumption at 670 µA full speed and microampere-level shutdown between samples keep total monitor current draw well within wearable thermal limits. The -40 °C to +85 °C operating range supports both body-worn and clinical-cart deployments.
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Rack-Mount Sensor Interface Cards
The MAX1236LEUA+T suits rack-mounted sensor-interface cards where multiple analog channels must be digitized per card while sharing a backplane I2C bus. The I2C interface supports up to 3.4 MHz High-Speed mode, keeping backplane bus traffic light even when several cards each host a MAX1236; two factory-set slave-address options let designers place two ADCs on one bus without external switches. At 94.4 ksps the part handles per-card sample rates typical of vibration, strain-gauge, and thermocouple front-end conditioning cards. The µMAX 8-pin package sits flat on the card PCB without raising the z-height profile above neighboring RJ45 connectors.
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IoT Sensor Hubs and Edge Nodes
The MAX1236LEUA+T is well suited to IoT edge nodes that aggregate multiple sensor types (temperature, humidity, light, gas) onto a single low-power ADC, because its I2C bus can be shared by the radio and the host MCU, and its shutdown current of microampere levels enables deep-sleep sampling patterns that maximize coin-cell battery life. Use the external reference overdrive mode to ratiometrically digitize resistive sensor bridges where the bridge excitation voltage is also the ADC reference, eliminating excitation drift as a measurement error source. The 4 single-ended inputs handle a typical sensor hub's analog channels without an external analog multiplexer, simplifying the BOM and reducing leakage paths. Hardware shutdown between samples extends battery life by orders of magnitude versus continuous-conversion modes.
추천
추천 제품 요약
엔지니어링 참조 데이터: MAX1236LEUA+T — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | MAX1236LEUA+ | MAX1238LEUA+T | MAX1239LEUA+T | MAX116EAX+T | MAX1162ACUB+T |
|---|---|---|---|---|---|---|
| Brand | Analog Devices (Maxim Integrated) | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 8-pin µMAX (uSOP) | 8-pin µMAX (uSOP) - same | 8-pin µMAX (uSOP) - same | 8-pin µMAX (uSOP) - same | 8-pin µMAX (uSOP) - same | 8-pin µMAX (uSOP) - same |
주요 차별점
- 4 channels plus integrated reference in the same 8-pin µMAX package (vs MAX1162ACUB+T (12-bit, 1-channel SPI in same package))
- Industry-standard I2C interface with High-Speed 3.4 MHz support (vs MAX1162ACUB+T (SPI interface))
- Pin-compatible scalability across the MAX1236–MAX1239 family (vs MAX1239LEUA+T (12-channel variant at 3V supply))
설계 노트
Estimated: at AVDD = 5.0 V and 94.4 ksps full-speed operation, the MAX1236LEUA+T draws 670 µA continuously, dissipating 3.35 mW. Add a 0.1 µF ceramic + 10 µF bulk decoupling network within 5 mm of pin 5; route a single via-pair star-ground into pin 4 GND. For battery-powered designs, use the hardware shutdown pin (set via I2C) to drop quiescent current to the microampere range between samples and extend runtime by orders of magnitude.
Route the I2C SDA (pin 7) and SCL (pin 6) traces as a differential pair with 4.7 kΩ pull-ups to AVDD; keep trace lengths under 50 mm to remain within the I2C Fast-mode 400 kHz spec. Place a small 100 Ω series resistor + 100 pF capacitor on each AIN pin to suppress input kickback from the internal track/hold switch. Keep analog input traces short and guard them with a GND pour to reject digital switching noise from the I2C lines.
Do not connect the REF pin directly to AVDD without a 0.1 µF + 10 µF bypass network—the internal reference cannot source large transient currents and noise on REF directly couples into conversions. Avoid leaving the I2C pull-up resistors too small (less than 1 kΩ) — the MAX1236 has limited sink current and undershoot may corrupt clock edges. When using external reference overdrive, ensure the reference source can drive the REF pin's input leakage (~±1 µA) or use a unity-gain buffer to prevent loading.
규정 준수 정보
RoHS compliant per Maxim/ADI product page; lead-free reflow compatible; not AEC-Q100 qualified (industrial grade only); REACH SVHC declaration available from manufacturer.
