MAX1231AEEG+ - 12-Bit 300ksps 16-Ch ADC w/FIFO & Temp Sensor
MPN： MAX1231AEEG+ ✓ 啟用中MAX1231AEEG+ 概覽
An ADC (Analog-to-Digital Converter) of this type belongs to the successive-approximation-register (SAR) converter family, which sits within the broader data-converter hierarchy under mixed-signal integrated circuits. SAR ADCs sample the input track with a sample-and-hold amplifier and then perform a binary search through an internal DAC to determine each bit. They are prized for deterministic latency, low power consumption at modest sampling rates, and the absence of pipeline delay - making them ideal for multiplexed multi-channel data-acquisition systems.
Key features include 300 kilosamples per second throughput, an internal FIFO with programmable depth, an internal temperature sensor readable via the same serial interface, a 4.096V internal reference, and an SPI/QSPI/MICROWIRE-compatible serial interface. The part also integrates a 16-entry channel-scan table, configurable single-ended or differential inputs, and software-configurable unipolar/bipolar input ranges.
Typical applications include portable and battery-powered data acquisition, process control and industrial automation, temperature monitoring with the on-die sensor, patient monitoring and medical instrumentation, and remote-sensor data logging. The 24-pin QSOP footprint keeps board area minimal while supporting up to 16 analog channels.
When laying out a PCB with the MAX1231AEEG+, place the 0.1 microfarad decoupling capacitors as close as possible to AVDD and DVDD pins and provide a solid ground plane directly under the device. The analog and digital ground pins should be tied at a single star point near the IC. Avoid routing digital signals beneath the analog input traces to prevent digital switching noise from coupling into the ADC front end.
This page synthesizes distributor pricing, drop-in alternative MPNs, and practical design notes beyond what is in the Maxim datasheet, including a quantified channel-count and supply-rail comparison versus competing pin-compatible ADCs such as the MAX1229 and MAX1227.
直接替換替代品，適用於 MAX1231AEEG+ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： MAX1231AEEG+ （相同外形與佔位） — 差異在於 Number of Input Channels, Internal Reference Voltage, Resolution, Input Type, Operating Temperature Range.
MAX1231BEEG+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX1231ACEG+T
✅ 直接替換聯絡詢價
查看資料表 →MAX1231AEEG+T
✅ 直接替換聯絡詢價
查看資料表 →MAX1231BCEG+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX1068AEEG+
✅ 直接替換聯絡詢價
查看資料表 →MAX1231AEEG+ 最大額定值與電氣特性
| 解析度 | 12 bits |
| Number of Input Channels | 8 or 16 single-ended / 4 or 8 differential |
| 取樣率 | 300 ksps |
| ADC Architecture | SAR (Successive Approximation Register) |
| Analog Supply Voltage | 3.0 V to 3.6 V |
| Digital Supply Voltage | 3.0 V to 5.5 V |
| Internal Reference Voltage | 4.096 V |
| Input Type | Single-ended or differential (software-configurable) |
| Serial Interface | SPI / QSPI / MICROWIRE-compatible |
| Internal FIFO | Yes (programmable depth) |
| Integrated Temperature Sensor | Yes |
| 封裝 / 外殼 | 24-QSOP |
| 工作溫度範圍 | -40C to +85C |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
MAX1231AEEG+ 腳位配置
| 腳位 1 | AIN0 — Analog input 0 |
| 腳位 2 | AIN1 — Analog input 1 |
| 腳位 3 | AIN2 — Analog input 2 |
| 腳位 4 | AIN3 — Analog input 3 |
| 腳位 5 | AIN4 — Analog input 4 |
| 腳位 6 | AIN5 — Analog input 5 |
| 腳位 7 | AIN6 — Analog input 6 |
| 腳位 8 | AIN7 — Analog input 7 |
| 腳位 9 | AIN8 — Analog input 8 |
| 腳位 10 | AIN9 — Analog input 9 |
| 腳位 11 | AIN10 — Analog input 10 |
| 腳位 12 | AIN11 — Analog input 11 |
| 腳位 13 | AIN12 — Analog input 12 |
| 腳位 14 | AIN13 — Analog input 13 |
| 腳位 15 | AIN14 — Analog input 14 |
| 腳位 16 | AIN15 — Analog input 15 |
| 腳位 17 | AVDD — Analog supply voltage (3.0V to 3.6V) |
| 腳位 18 | REF — Internal 4.096V reference / external override |
| 腳位 19 | AGND — Analog ground |
| 腳位 20 | DGND — Digital ground |
| 腳位 21 | DVDD — Digital supply voltage (3.0V to 5.5V) |
| 腳位 22 | SCLK — Serial clock input |
| 腳位 23 | DOUT — Serial data output |
| 腳位 24 | DIN — Serial data input |
典型應用
MAX1231AEEG+ 適用於 7 應用s: Portable Multi-Channel Data Acquisition, Industrial Process Control and Monitoring, Temperature Monitoring with On-Die Sensor, Patient and Medical Monitoring, Remote Sensor Data Logging, Factory Automation I/O Modules, Battery-Operated Handheld Test Instruments.
Portable Multi-Channel Data Acquisition
The MAX1231AEEG+ fits portable multi-channel data acquisition because it packs 8 or 16 single-ended channels, 300 ksps throughput, and a serial SPI interface into a 24-QSOP footprint. Its 3.0V to 3.6V analog rail draws very little current and pairs well with Li-Ion or USB battery packs, while the separate 3.0V to 5.5V digital rail directly mates with common MCUs. The internal FIFO of the MAX1231 lets the host MCU wake briefly, read a burst of conversions, and return to sleep, which extends battery life. Typical parameter alignment: 12 bits gives ~2.5 mV LSB on a 5V input range, enough resolution for sensor front-ends and instrumentation. Use the MAX1231AEEG+ ahead of an ARM Cortex-M0 host for low-power DAS modules.
推薦
Industrial Process Control and Monitoring
For industrial process control, the MAX1231AEEG+ offers 16 single-ended channels that can be routed to thermocouples, pressure transducers, and 4-20 mA shunts via external signal conditioning. Its 4.096V internal reference simplifies bipolar signal scaling, and the internal temperature sensor enables a built-in cold-junction compensation channel. The 300 ksps throughput means a full sequential scan of 16 channels still completes in under 60 microseconds plus the channel's acquisition time, satisfying most PLC update-rate budgets. The -40C to +85C industrial operating range supports factory-floor enclosures. Combine with the MAX1227 (8-ch) for lower-channel sub-systems.
推薦
Temperature Monitoring with On-Die Sensor
The MAX1231AEEG+ integrates a temperature sensor accessible through the same SPI bus as the ADC channels, eliminating the need for a separate thermal monitor IC in cabinet and chassis designs. Combined with the internal FIFO, the host can periodically wake, sample multiple analog inputs plus temperature, and return to sleep. The 4.096V internal reference is factory-trimmed for low drift, giving a stable ADC reference for the temperature conversion. Operating from 3.3V, the chip fits easily into PLC backplanes and telecom line cards. Use the MAX1231AEEG+ on telecom base-station fan-controller boards.
推薦
Patient and Medical Monitoring
Medical patient-monitoring instruments benefit from the MAX1231AEEG+'s 12-bit resolution and 16-channel multiplexer when digitizing multiple biopotential and physiological signals. The SAR architecture gives deterministic latency that simplifies synchronization with ECG/Holter recorders, and the internal temperature sensor assists with patient-skin or device-chamber thermal monitoring. The 3.3V analog supply reduces leakage current in battery-operated ambulatory devices, while the flexible digital supply scales to 5V logic in mains-powered bedside monitors. Connect the MAX1231AEEG+ to a low-power MCU front-end in vital-signs acquisition modules.
推薦
Remote Sensor Data Logging
Remote sensor loggers in agriculture, environmental telemetry, and HVAC deployments use the MAX1231AEEG+ to read multi-channel sensor arrays plus its own internal temperature sensor for cold-chain monitoring. The internal FIFO lets the host accumulate many conversions before having to wake the SPI bus, reducing radio-activity time on wireless nodes. Single 3.3V analog rail operation simplifies solar/battery power trees; the digital rail adapts to 5V when paired with common industrial MCUs. The 24-QSOP footprint fits in tight sensor-hub boards. Pair with a LoRa or sub-GHz transceiver module for field-deployed loggers.
推薦
Factory Automation I/O Modules
Programmable Logic Controllers (PLCs) and distributed I/O nodes use the MAX1231AEEG+ to digitize analog field signals such as 0-10V, 4-20 mA loops, and RTDs after signal conditioning. Its 16 channels per chip serve eight optically isolated analog inputs when each input uses a pair of differential MUX lines, halving remote-I/O component counts. With a 300 ksps rate, the chip multiplexes rapidly enough for closed-loop PID at 1 kHz per channel when oversampling is applied. The industrial temperature range of -40C to +85C supports outdoor and shop-floor enclosures. Combine with an isolator and digital I/O expander for complete PLC analog front ends.
推薦
Battery-Operated Handheld Test Instruments
Handheld digital multimeters, oscilloscope front-ends, and signal-analyzer probes use the MAX1231AEEG+ to digitize scaled sensor waveforms at up to 300 ksps, fast enough for audio-bandwidth measurements and ultrasonic inspections. The 3.0V to 3.6V analog supply draws minimal quiescent current from Li-Ion cells, and the internal FIFO bursts shortens the host MCU's active duty cycle. SPI-compatible serial output allows direct interfacing with display-driver MCUs in compact TFT-based handhelds. The 24-QSOP keeps the BOM compact in pen-style form factors.
推薦
推薦產品摘要
工程參考資料，適用於 MAX1231AEEG+ — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | MAX1231BEEG+ | MAX1231ACEG+T | MAX1231AEEG+T | MAX1231BCEG+ | MAX1068AEEG+ |
|---|---|---|---|---|---|---|
| Brand | Analog Devices (Maxim Integrated) | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 24-QSOP | 24-QSOP - same | 24-QSOP - same | 24-QSOP - same | 24-QSOP - same | 24-QSOP - same |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Sampling Rate | 300 ksps | 300 ksps | 300 ksps | 300 ksps | 300 ksps | 200 ksps |
| Number of Channels | 8/16 single-ended, 4/8 differential | 8/16 SE / 4/8 DIFF | 8/16 SE / 4/8 DIFF | 8/16 SE / 4/8 DIFF | 8/16 SE / 4/8 DIFF | 8/16 SE / 4/8 DIFF |
| Internal FIFO | Yes | Yes | Yes | Yes | Yes | No |
| Internal Temp Sensor | Yes | Yes | Yes | Yes | Yes | No |
| Analog Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V |
| Silicon Revision | Rev A | Rev B | Rev A | Rev A | Rev B (tape & reel for C-revision marking) | Rev A |
主要差異化特點
- Internal FIFO plus on-die temperature sensor (對比MAX1068AEEG+)
- Pin-compatible silicon revisions (對比MAX1231BEEG+)
- Choice of internal or external reference (對比MAX1229ACEP+)
設計說明
Estimated: the MAX1231AEEG+ draws its supply from a 3.0V to 3.6V analog rail at AVDD (pin 17) and a 3.0V to 5.5V digital rail at DVDD (pin 21). Place 0.1 microfarad ceramic decoupling capacitors as close as possible to both supply pins, with a 10 microfarad bulk capacitor nearby on each rail. Keep analog and digital ground returns routed separately back to a single star point near pin 20 (DGND) to avoid digital switching currents coupling into the analog reference at pin 18.
Route the analog input traces (pins 1-16, AIN0-AIN15) directly above a continuous analog ground plane and avoid crossing these traces with the digital SPI lines (SCLK, DOUT, DIN on pins 22-24). Keep trace lengths short and add a guard ground trace between any high-impedance analog input node and adjacent digital traces. Place the 0.1 microfarad reference bypass capacitor on pin 18 (REF) within a few millimeters of the IC to minimize reference noise injection.
Do not leave any unused analog input (AIN0-AIN15) floating; tie them to AGND through a defined path to prevent spurious conversions from crosstalk. When using differential mode, ensure that the negative input always remains within the input common-mode range defined by AVDD and AGND. The internal reference at pin 18 can be overdriven by an external reference, but doing so disables the internal reference - do not apply both simultaneously without first consulting the datasheet ordering guide.
The 24-QSOP package has a junction-to-ambient thermal resistance suitable for the modest quiescent current of the MAX1231AEEG+. In sealed or low-airflow enclosures, verify the ambient temperature stays within the -40C to +85C operating range with margin; consider adding copper area under the exposed thermal pad region of the QSOP, even if the primary heat path is through the leads.
合規資訊
RoHS and REACH compliance per Maxim/Analog Devices product page. Lead-free and halogen-free per datasheet ordering information. Automotive-grade (AEC-Q100) qualification is not listed on the standard MAX1231AEEG+ ordering code; consult Analog Devices for V-grade automotive variants.
