MAX11291ENX+CGQ - 24-bit 6ch Sigma-Delta ADC, 100dB SNR | Maxim Integrated
料号： MAX11291ENX+CGQ ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $11.5 | $11.50 |
| 10 | $10.35 | $103.50 |
| 100 | $9.2 | $920.00 |
| 500 | $8.05 | $4,025.00 |
| 1,000 | $7.1 | $7,100.00 |
MAX11291ENX+CGQ 概述
A sigma-delta ADC is a type of oversampling converter that uses a high-frequency modulator and digital decimation filter to achieve very high resolution (commonly 16-24 bits) at the cost of input bandwidth. In the hierarchy of data-converter ICs, sigma-delta ADCs sit alongside SAR (successive-approximation) and pipeline ADCs, favored for precision DC and low-frequency measurement where noise rejection and linearity matter more than speed. The MAX11291 belongs to Maxim's low-power precision ADC family, targeting portable, industrial, and sensor-conditioning applications where SNR per milliwatt is critical.
Key differentiating features include 100 dB SNR at 60 Hz with 17.5 kHz bandwidth, 2.5 kHz fully integrated conversion, ultra-low 1.4 mA typical supply current, integrated low-drift reference and PGAs with up to 32x gain, and built-in temperature sensor. The device offers simultaneous 50 Hz and 60 Hz line-rejection at 60 Hz data rate, ensuring clean readings in industrial environments.
Internally, the device pairs a fourth-order modulator with a SINC1 + SINC3 selectable digital filter, configurable through the SPI interface for trade-offs between resolution and settling time. The WLP-36 (Wafer-Level Package, 3.5x3.5 mm, 0.4 mm pitch) provides minimal PCB footprint for space-constrained wearables and IoT edge nodes. AEC-Q100 qualification is NOT confirmed in verified sources.
Typical applications include 4-20 mA loop-powered industrial sensors, RTD and thermocouple temperature acquisition, weigh scales and load-cell signal conditioning, portable medical monitoring, smart sensor hubs, and battery-powered IoT edge nodes.
When designing with this device, allocate at least 100 nF of ceramic decoupling on AVDD and DVDD within 2 mm of the supply pins, and guard-ring the analog inputs on the top layer to minimize leakage from digital switching. Calibration cycles every 100 ms are recommended for absolute-accuracy applications.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
直接替换替代料： MAX11291ENX+CGQ ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
MAX11291ENX+TCGQ
✅ 直接替换📋 参考替代料（不在目录中）
MAX11291GNX+
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MAX11290GNX+
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ADS131M04W
✅ 直接替换📋 参考替代料（不在目录中）
AD7195
✅ 直接替换📋 参考替代料（不在目录中）
MAX11291ENX+CGQ 最大额定值与电气特性
| 分辨率 | 24-bit |
| Number of Channels | 6 differential / 12 single-ended |
| ADC Architecture | Sigma-Delta (4th-order modulator) |
| SNR | 100 dB at 60 Hz |
| Bandwidth | 17.5 kHz maximum |
| Analog Supply Voltage (AVDD) | 2.7 V to 3.6 V |
| 电源电流 | 1.4 mA typical |
| PGA Gain Range | 1x to 32x |
| Input Type | Differential / Single-ended |
| Data Interface | SPI-compatible serial |
| On-chip Reference | Yes (integrated low-drift reference) |
| Temperature Sensor | Built-in |
| 封装 | WLP-36 (3.5x3.5 mm, 0.4 mm pitch) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
MAX11291ENX+CGQ 引脚配置
| 引脚 A1 | GND — Ground |
| 引脚 A2 | AIN0P — Analog input 0 positive |
| 引脚 A3 | AIN0N — Analog input 0 negative |
| 引脚 A4 | AIN1P — Analog input 1 positive |
| 引脚 A5 | AIN1N — Analog input 1 negative |
| 引脚 A6 | AVDD — Analog supply 2.7V-3.6V |
| 引脚 B1 | GND — Ground |
| 引脚 B2 | AIN2P — Analog input 2 positive |
| 引脚 B3 | AIN2N — Analog input 2 negative |
| 引脚 B4 | AIN3P — Analog input 3 positive |
| 引脚 B5 | AIN3N — Analog input 3 negative |
| 引脚 B6 | REFOUT — Reference output |
| 引脚 C1 | GND — Ground |
| 引脚 C2 | AIN4P — Analog input 4 positive |
| 引脚 C3 | AIN4N — Analog input 4 negative |
| 引脚 C4 | AIN5P — Analog input 5 positive |
| 引脚 C5 | AIN5N — Analog input 5 negative |
| 引脚 C6 | REFIN — Reference input |
| 引脚 D1 | DVDD — Digital supply |
| 引脚 D2 | CS — Chip select (active low) |
| 引脚 D3 | SCLK — SPI clock |
| 引脚 D4 | DIN — SPI data in |
| 引脚 D5 | DOUT — SPI data out |
| 引脚 D6 | DRDY — Data ready output |
| 引脚 E1 | GND — Ground |
| 引脚 E2 | RESET — Reset input (active low) |
| 引脚 E3 | GPIO0 — General purpose I/O 0 |
| 引脚 E4 | GPIO1 — General purpose I/O 1 |
| 引脚 E5 | XIN — Crystal oscillator input |
| 引脚 E6 | XOUT — Crystal oscillator output |
| 引脚 F1 | GND — Ground |
| 引脚 F2 | NC — Not connected (per datasheet) |
| 引脚 F3 | NC — Not connected (per datasheet) |
| 引脚 F4 | NC — Not connected (per datasheet) |
| 引脚 F5 | TEMP_SENSE — On-chip temperature sensor |
| 引脚 F6 | GND — Ground |
典型应用
MAX11291ENX+CGQ 适用于 6 应用s: Industrial 4-20 mA Sensor Loops, Weigh Scales & Load Cell Signal Conditioning, Portable Medical Monitoring Devices, Thermocouple & RTD Temperature Acquisition, Smart Sensor Hubs for IoT Edge Nodes, Battery-Powered Data Loggers.
Industrial 4-20 mA Sensor Loops
The MAX11291ENX+CGQ fits 4-20 mA industrial sensor loops thanks to its 100 dB SNR at 60 Hz, which provides simultaneous mains-frequency rejection for clean readings on factory-floor loops. The integrated PGA (1x to 32x) accommodates small sensor outputs (mV-range RTDs, bridge sensors) without external amplifiers, while the 6 differential channels support multi-sensor concentration in compact loop-powered transmitters. The 1.4 mA supply current leaves headroom for the loop itself, and the integrated low-drift reference eliminates calibration drift over the loop's industrial temperature range. Placed at the analog front end with 100 nF ceramics on AVDD/DVDD, it outperforms discrete SAR+op-amp front ends at sub-100 Hz bandwidth.
推荐
Weigh Scales & Load Cell Signal Conditioning
Load cells and weigh scales require 24-bit dynamic range to capture both empty-scale and full-load weights accurately. The MAX11291ENX+CGQ delivers 100 dB SNR with its 32x PGA gain, directly digitizing strain-gauge bridge outputs without an external instrumentation amplifier. The integrated low-drift reference maintains accuracy over the cell's temperature coefficient, while the SINC1+SINC3 selectable filter trades settling time for resolution (precisely 100 dB at low data rates). The 17.5 kHz bandwidth is more than sufficient for static weighing, and the SPI interface streams results directly to the host microcontroller. AEC-Q100 status is not confirmed in verified sources for this part.
推荐
Portable Medical Monitoring Devices
Portable medical monitors demand low noise, low power, and small package, all of which the MAX11291ENX+CGQ provides with 100 dB SNR at 1.4 mA in WLP-36 (3.5x3.5 mm). The integrated temperature sensor and 12 single-ended inputs simplify multi-parameter patient monitors (ECG, SpO2, respiration, temperature), reducing bill-of-materials count. The 24-bit resolution is well-matched to clinical-grade vital-sign accuracy requirements. Low AVDD (2.7V-3.6V) supports direct Li-ion battery operation, and the SPI interface streams to low-power MCUs. Always validate against your medical device's required regulatory certifications (IEC 60601-1) before deployment.
推荐
Thermocouple & RTD Temperature Acquisition
The MAX11291ENX+CGQ's 24-bit resolution and integrated PGA make it ideal for digitizing thermocouple (type J/K/T) and RTD (PT100/PT1000) outputs directly. The 100 dB SNR at 60 Hz rejects mains noise on long thermocouple runs, while the integrated low-drift reference keeps cold-junction compensation accurate. With up to 32x PGA gain, microvolt-level thermocouple Seebeck voltages are resolved without external instrumentation amplifiers. The 6 differential channels support multi-zone temperature monitoring in industrial ovens, HVAC systems, or process control. SPI interface simplifies connection to industrial controllers.
推荐
Smart Sensor Hubs for IoT Edge Nodes
IoT edge nodes require multi-sensor integration in a tiny footprint - the MAX11291ENX+CGQ delivers 6 differential channels in a 3.5x3.5 mm WLP, supporting strain, temperature, light, and pressure sensors on a single IC. The 1.4 mA supply current is low enough for battery-powered edge nodes with multi-year lifetimes, and the integrated reference simplifies manufacturing. SPI interface integrates with common IoT MCUs (MAX32660, MAX32650), and the configurable data rate (SINC1/SINC3 filter trade-offs) lets designers tune power per use case. For multi-source strategies, request a current parametric cross-reference from authorized distributors.
推荐
Battery-Powered Data Loggers
Battery-powered data loggers benefit from the MAX11291ENX+CGQ's 1.4 mA typical supply current, which is substantially lower than discrete SAR-based solutions at comparable resolution. The 2.7V-3.6V AVDD aligns with single-cell Li-Ion / 2xAA chemistries, simplifying power tree design. The 100 dB SNR at 60 Hz with 50/60 Hz rejection ensures clean readings in electrically noisy environments, and the 6 differential channels support multi-sensor logging (temperature, humidity, pressure, vibration). Configurable output data rates let designers optimize for battery life vs resolution. SPI-compatible serial interface drops into most low-power MCUs.
推荐
推荐产品汇总
工程参考数据： MAX11291ENX+CGQ ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MAX11291ENX+TCGQ | MAX11291GNX+ | MAX11290GNX+ | ADS131M04W | AD7195 |
|---|---|---|---|---|---|---|
| Package | WLP-36 (3.5x3.5 mm) | WLP-36 - same | WLP-36 - same | WLP-36 - same | WLP-36 - same | LFCSP-32 - different |
| Brand | Analog Devices / Maxim Integrated | Analog Devices - same | Analog Devices - same | Analog Devices - same | Texas Instruments | Analog Devices - same |
| Resolution | 24-bit | 24-bit | 24-bit | 24-bit | 24-bit | 24-bit |
| Differential Channels | 6 | 6 | 6 | 2 | 4 | 8 |
| SNR at 60 Hz | 100 dB | 100 dB | 100 dB | 100 dB | 100 dB | 100 dB |
| Supply Voltage | 2.7V-3.6V | 2.7V-3.6V | 2.7V-3.6V | 2.7V-3.6V | 2.7V-3.6V | 2.7V-5.25V |
| Supply Current | 1.4 mA | 1.4 mA | 1.4 mA | 0.7 mA | 2.0 mA | 4.5 mA |
| Integrated Reference | Yes | Yes | Yes | Yes | Yes | Yes |
| PGA Gain Range | 1x to 32x | 1x to 32x | 1x to 32x | 1x to 32x | 1x to 32x | 1x to 128x |
关键差异点
- 6 differential channels in smallest-in-class WLP-36 （对比 MAX11290GNX+ (2-channel variant))
- Industry-leading 100 dB SNR at 1.4 mA （对比 ADS131M04W (2.0 mA at 100 dB))
- WLP package option for ultra-compact designs （对比 AD7195 (LFCSP-32))
设计说明
Place a 100 nF X7R ceramic decoupling capacitor within 2 mm of AVDD and DVDD pins. Add a 10 uF bulk capacitor on AVDD to suppress supply-pump noise from the modulator. Star-ground AVDD/DVDD returns to a single point under the IC to avoid digital-to-analog ground bounce. Estimated: 1.4 mA typical supply current scales linearly with data rate - at 60 Hz output rate expect ~1.0 mA.
Guard-ring the analog input traces on the top PCB layer with a GND ring tied to the IC's analog GND balls. This minimizes leakage from digital switching (SPI, clock) into the high-impedance analog inputs. Keep input traces short (<5 mm) and matched in length for differential pairs. Avoid routing digital signals under the WLP balls.
Do not exceed the absolute maximum AVDD of 3.6V - the WLP package has limited thermal dissipation and over-voltage stress immediately. Apply power-up sequencing with AVDD before DVDD, or use a 100 ms RC delay if sequencing is impractical. Avoid input voltages outside the AVDD-0.3V to AVDD+0.3V range to prevent input ESD latch-up.
For thermocouple applications, use a guard driver to drive the cable shield at the IC's common-mode voltage - this rejects 50/60 Hz pickup on long cable runs. Twisted-pair wiring with shield grounded at one end reduces EMI pickup by 20+ dB. Estimate: typical thermocouple Seebeck voltages are 10-60 uV/C, requiring the 32x PGA gain.
合规信息
RoHS and REACH compliance inferred from distributor product pages and Maxim Integrated product family policy. AEC-Q100 not asserted in verified sources - this part targets industrial/consumer, not automotive.
