MAX1239MEEE+T - 12-Ch 12-Bit SAR ADC, I2C, QSOP-16 | Maxim
部品番号: MAX1239MEEE+T ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $7.79 | $7.79 |
| 10 | $7.04 | $70.40 |
| 100 | $6.31 | $631.00 |
| 500 | $5.62 | $2,810.00 |
| 1,000 | $4.99 | $4,990.00 |
MAX1239MEEE+T 概要
A SAR (Successive Approximation Register) ADC is a type of analog-to-digital converter which performs conversion by comparing the input voltage against a reference using a binary-search algorithm implemented in switched-capacitor hardware. SAR ADCs occupy the middle ground between delta-sigma ADCs (very high resolution, slow) and flash ADCs (very fast, low resolution) and are the workhorse of moderate-speed, moderate-accuracy multichannel data-acquisition systems. Within the broader hierarchy, the MAX1239 belongs to the data-acquisition IC family, under interface and signal-chain ICs, used wherever many analog sensors or signals must be digitized into a microcontroller-readable format.
Key features include a built-in 4.096 V internal reference (the MAX1236/7/8 variants offer a 2.048 V reference for smaller full-scale ranges), an I2C-compatible serial interface supporting up to 400 kHz fast mode, software-configurable unipolar/bipolar inputs, automatic channel scanning, low 1.5 mA supply current at full sampling rate, and a hardware-/software-active-low shutdown mode that drops current to 1 µA for power-constrained applications. An external reference can also be applied through the REF pin for applications needing higher absolute accuracy or different full-scale ranges.
The MAX1239MEEE+T uses Maxim's low-noise charge-redistribution SAR core with a switched-capacitor input T/H that accepts input bandwidths up to about 1 MHz, eliminating the need for an external buffer in most applications. The device includes internal FIFO and channel-scan registers that let it sequentially convert multiple channels autonomously with one I2C command, offloading the host microcontroller. The QSOP-16 (also designated 16-QSOP or SSOP-16) provides a compact surface-mount footprint with gull-wing leads compatible with standard 150-mil SOIC-16 PCB land patterns.
Typical applications include multichannel sensor monitoring in portable medical instruments, industrial process control with 4-20 mA loop sensors, battery-cell voltage and temperature monitoring in battery-management systems, factory-automation analog front-ends, and rack-mount data-acquisition modules. The wide supply tolerance (2.7 V to 5.5 V) and low shutdown current make it equally suitable for line-powered industrial designs and battery-powered portable instruments.
When designing with the MAX1239, ensure that the input voltage at any analog input does not exceed VDD + 0.3 V, place the 10 µF + 0.1 µF decoupling pair as close as possible to VDD, and keep analog and digital grounds joined at a single star point to minimize digital switching noise coupling into the SAR comparator. The internal reference cannot drive heavy loads, so use a high-impedance input reference buffer if sourcing external current is required. The MAX1239LEEE is the lead-free, +125 °C extended-temperature variant, while the MAX1239KEEE provides the same pinout but with 10-bit resolution (10-bit pin-compatible family: MAX1136-MAX1139).
ドロップイン代替品: MAX1239MEEE+T — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: MAX1239MEEE+T （同一形状・フットプリント） — 相違点: Operating Temperature, Resolution, Input Voltage Range, Interface, Internal Reference.
クイック比較ツール — 並列比較する代替部品を選択:
MAX1139MEEE+T
✅ ドロップイン✓ 在庫あり
$3.9 / 個
データシートを見る →MAX1239MEEE+
✅ ドロップイン✓ 在庫あり
$5.21 / 個
データシートを見る →MAX1239LEEE+T
✅ ドロップイン✓ 在庫あり
$4.62 / 個
データシートを見る →MAX1239KEEE+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1139KEEE+
✅ ドロップイン✓ 在庫あり
$4.45 / 個
データシートを見る →MAX1067CCEE
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX1239MEEE+T 最大定格＆電気的特性
| 分解能 | 12 bit |
| Architecture | SAR (Successive Approximation) |
| Number of Analog Inputs | 12 single-ended / 6 differential |
| Sampling Rate (max) | 94.4 ksps |
| Supply Voltage Range | 2.7 V to 3.6 V or 4.5 V to 5.5 V |
| Supply Current (operating) | 1.5 mA at max sample rate |
| Supply Current (shutdown) | 1 µA |
| Internal Reference | 4.096 V (MAX1239 variant) |
| External Reference Input | Supported via REF pin |
| 入力電圧範囲 | 0 V to VREF (unipolar) |
| Serial Interface | I2C-compatible 2-wire, up to 400 kHz |
| 動作温度範囲 | -40 °C to +85 °C (extended: MEEE suffix) |
| パッケージ | 16-QSOP (SSOP-16, 0.154 in width) |
| 実装タイプ | Surface Mount |
| RoHS ステータス | Compliant (T suffix = lead-free tape and reel) |
| Channel Scan Mode | Yes, internal FIFO and sequential scan |
MAX1239MEEE+T ピン構成
| ピン 1 | AIN0 — Analog input channel 0 |
| ピン 2 | AIN1 — Analog input channel 1 |
| ピン 3 | AIN2 — Analog input channel 2 |
| ピン 4 | AIN3 — Analog input channel 3 |
| ピン 5 | AIN4 — Analog input channel 4 |
| ピン 6 | AIN5 — Analog input channel 5 |
| ピン 7 | AIN6 — Analog input channel 6 |
| ピン 8 | AIN7 — Analog input channel 7 |
| ピン 9 | AIN8 — Analog input channel 8 |
| ピン 10 | AIN9 — Analog input channel 9 |
| ピン 11 | AIN10 — Analog input channel 10 |
| ピン 12 | AIN11 — Analog input channel 11 |
| ピン 13 | REF — Reference input/output (internal 4.096 V or external) |
| ピン 14 | GND — Ground |
| ピン 15 | SDA — I2C serial data |
| ピン 16 | SCL — I2C serial clock |
主な用途
MAX1239MEEE+T の用途: 6 件s: Industrial Process Control Sensor Monitoring, Portable Medical Instrument Data Acquisition, Battery Management System Monitoring, Data Acquisition Module / Rack-mount DAQ, Building Automation and HVAC Sensor Aggregation, Factory Automation Analog Front-End.
Industrial Process Control Sensor Monitoring
The MAX1239MEEE+T fits industrial process-control analog front-ends where 4 to 12 sensors (temperature, pressure, flow, level) must be digitized into a PLC or controller. Its 12 single-ended channels plus internal 4.096 V reference match the typical 0-4.096 V transducer output span without external signal conditioning, and the 94.4 ksps throughput easily exceeds the 100 Hz update rate demanded by most PLC analog modules. The I2C-compatible 2-wire interface minimizes wiring in point-to-point PLC I/O and remote-IO drops, and software channel-scanning plus automatic FIFO offload offload the host microcontroller for deterministic loop times.
おすすめ
Portable Medical Instrument Data Acquisition
Battery-powered medical instruments such as blood-pressure monitors, glucometers and pulse oximeters use the MAX1239MEEE+T to digitize multiple biopotential and sensor channels. The 1 µA shutdown current between conversions extends battery life, while 1.5 mA active supply current keeps continuous-monitoring designs within thermal and power budget. The wide 2.7 V to 5.5 V supply range lets the same board run from a single Li-ion cell or a 5 V USB rail. The 12-bit resolution provides 1 mV LSB at the 4.096 V full-scale range, sufficient for most biosensor signal chains.
おすすめ
Battery Management System Monitoring
Multi-cell battery packs for e-mobility, UPS and telecom backup use the MAX1239MEEE+T to monitor individual cell voltages, pack current sense, and temperature sensors. With 12 input channels, a single IC handles up to 12 Li-ion cells or up to 12 temperature sensors per battery module, reducing BOM cost. The 0-V to 4.096 V input span lines up with typical cell voltages plus a resistor divider for stacked-cell measurement, while the low 1.5 mA supply keeps the always-on monitor within the standby power budget of the BMS.
おすすめ
Data Acquisition Module / Rack-mount DAQ
Modular data-acquisition cards for test, measurement and laboratory instrumentation benefit from the MAX1239MEEE+T's 12 single-ended / 6 differential inputs and internal 4.096 V reference. The 94.4 ksps throughput supports per-channel sampling rates well above the 10 kHz demanded by most general-purpose DAQ modules, and the I2C bus minimizes pin count on the host interface connector. Differential input configuration rejects common-mode noise in long cable runs typical of rack-mounted instrumentation, and software channel scan sequences multiple channels without host intervention.
おすすめ
Building Automation and HVAC Sensor Aggregation
Building automation controllers aggregate multiple analog sensors (temperature, humidity, CO2, light, occupancy) on a single I2C bus using the MAX1239MEEE+T as the A-D converter. The 12 channels per IC allow one ADC to cover an entire room or small HVAC zone, while the wide supply range (2.7 V to 5.5 V) accommodates both 3.3 V and 5 V backplane designs common in commercial building controls. The low shutdown current (<1 µA) is ideal for energy-harvesting wireless sensor nodes that spend most of the time asleep between readings.
おすすめ
Factory Automation Analog Front-End
Factory floor analog front-ends digitize 4-20 mA loops, 0-10 V actuator feedback, thermocouple and RTD-conditioned outputs via the MAX1239MEEE+T. Each of the 12 inputs supports the 0 V to 4.096 V range directly from current-sense or voltage-divider signal conditioning, and the I2C bus keeps wiring simple on multi-drop industrial fieldbuses. Industrial temperature grade (-40 °C to +85 °C) and lead-free QSOP-16 packaging meet factory-floor environmental requirements, and the low-power shutdown supports energy-aware control cabinets.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: MAX1239MEEE+T — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | MAX1139MEEE+T | MAX1239MEEE+ | MAX1239LEEE+T | MAX1239KEEE+ | MAX1139KEEE+ | MAX1067CCEE |
|---|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 16-QSOP (SSOP-16) | 16-QSOP (SSOP-16) - same | 16-QSOP (SSOP-16) - same | 16-QSOP (SSOP-16) - same | 16-QSOP (SSOP-16) - same | 16-QSOP (SSOP-16) - same | 16-QSOP (SSOP-16) - same |
| Resolution | 12 bit | 10 bit | 12 bit | 12 bit | 12 bit | 10 bit | 12 bit |
| Number of Analog Inputs | 12 single-ended / 6 differential | 12 single-ended / 6 differential | 12 single-ended / 6 differential | 12 single-ended / 6 differential | 12 single-ended / 6 differential | 12 single-ended / 6 differential | 12 single-ended / 6 differential |
| Internal Reference | 4.096 V | 4.096 V | 4.096 V | 4.096 V | 4.096 V | 4.096 V | 4.096 V |
主な差別化要因
- Highest channel count in the MAX1236-MAX1239 family with 12-bit resolution （vs MAX1238MEEE+T)
- 4.096 V reference versus 2.048 V reference for higher full-scale input span （vs MAX1237MEEE+T)
- 94.4 ksps throughput with hardware-autonomous channel scanning （vs MAX1067CCEE)
設計ノート
Place a 10 µF tantalum (or ceramic) + a 0.1 µF ceramic decoupling pair as close as possible to the VDD pin of the MAX1239MEEE+T. The SAR converter draws brief but sharp current pulses during each conversion, and inadequate supply decoupling will couple digital switching noise into the analog input path, increasing conversion error. Place the same decoupling topology on the REF pin when using the internal reference, because the reference buffer cannot drive heavy external loads and must be kept low-noise.
Use a star-ground or split-ground layout that joins analog and digital grounds at a single point near the IC. Route analog input traces as short as possible and keep them away from the SDA/SCL digital lines, since the SAR comparator samples at full speed and any digital switching edge within a few nanoseconds of the sample instant will convert into a sampled-noise code. Estimated: for the 16-QSOP package, a 4-layer board with continuous analog ground plane on layer 2 typically achieves the best ENOB performance.
Do not apply an input voltage to any AINx pin that exceeds VDD + 0.3 V or falls below GND - 0.3 V; the MAX1239's analog input ESD diodes will forward-conduct and couple energy into the supply. When using the internal 4.096 V reference, do not draw more than 100 µA from the REF pin, or buffer the reference with a low-noise op-amp. Always wake the IAT from shutdown at least 1 ms before starting conversions to allow the internal reference to settle.
For full 12-bit ENOB performance, source-impedance at AINx should be kept below 5 kΩ; above that, the internal T/H settling time degrades and INL worsens. Add a small external RC (typically 100 Ω + 1 nF) on each high-impedance input for noise filtering. The I2C SDA/SCL lines benefit from 4.7 kΩ pull-ups and a series resistor near the IC for EMI suppression in noisy industrial environments.
