MAX11291ENX+CGQ - 24-bit 6ch Sigma-Delta ADC, 100dB SNR | Maxim Integrated
MPN: MAX11291ENX+CGQ ✓ نشطMAX11291ENX+CGQ نظرة عامة
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.
بدائل مباشرة لـ MAX11291ENX+CGQ — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
MAX11291ENX+TCGQ
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
MAX11291GNX+
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منها📋 بديل مرجعي (غير موجود في الكتالوج)
MAX11290GNX+
✅ بديل مباشر ⚠️ مواصفات غير مُتحقق منها📋 بديل مرجعي (غير موجود في الكتالوج)
ADS131M04W
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
AD7195
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
MAX11291ENX+CGQ الحدود القصوى والخصائص الكهربائية
| الدقة | 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 |
| تيار التغذية | 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 |
| العلبة | WLP-36 (3.5x3.5 mm, 0.4 mm pitch) |
| نوع التركيب | Surface Mount |
| حالة RoHS | Compliant |
تكوين أطراف MAX11291ENX+CGQ
| دبوس A1 | GND — Ground |
| دبوس A2 | AIN0P — Analog input 0 positive |
| دبوس A3 | AIN0N — Analog input 0 negative |
| دبوس A4 | AIN1P — Analog input 1 positive |
| دبوس A5 | AIN1N — Analog input 1 negative |
| دبوس A6 | AVDD — Analog supply 2.7V-3.6V |
| دبوس B1 | GND — Ground |
| دبوس B2 | AIN2P — Analog input 2 positive |
| دبوس B3 | AIN2N — Analog input 2 negative |
| دبوس B4 | AIN3P — Analog input 3 positive |
| دبوس B5 | AIN3N — Analog input 3 negative |
| دبوس B6 | REFOUT — Reference output |
| دبوس C1 | GND — Ground |
| دبوس C2 | AIN4P — Analog input 4 positive |
| دبوس C3 | AIN4N — Analog input 4 negative |
| دبوس C4 | AIN5P — Analog input 5 positive |
| دبوس C5 | AIN5N — Analog input 5 negative |
| دبوس C6 | REFIN — Reference input |
| دبوس D1 | DVDD — Digital supply |
| دبوس D2 | CS — Chip select (active low) |
| دبوس D3 | SCLK — SPI clock |
| دبوس D4 | DIN — SPI data in |
| دبوس D5 | DOUT — SPI data out |
| دبوس D6 | DRDY — Data ready output |
| دبوس E1 | GND — Ground |
| دبوس E2 | RESET — Reset input (active low) |
| دبوس E3 | GPIO0 — General purpose I/O 0 |
| دبوس E4 | GPIO1 — General purpose I/O 1 |
| دبوس E5 | XIN — Crystal oscillator input |
| دبوس E6 | XOUT — Crystal oscillator output |
| دبوس F1 | GND — Ground |
| دبوس F2 | NC — Not connected (per datasheet) |
| دبوس F3 | NC — Not connected (per datasheet) |
| دبوس F4 | NC — Not connected (per datasheet) |
| دبوس F5 | TEMP_SENSE — On-chip temperature sensor |
| دبوس F6 | GND — Ground |
التطبيقات النموذجية
MAX11291ENX+CGQ مناسب لـ 6 التطبيقs: 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.
موصى به
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.
موصى به
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.
موصى به
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.
موصى به
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.
موصى به
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.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ MAX11291ENX+CGQ — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | 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 |
أبرز الفروقات
- 6 differential channels in smallest-in-class WLP-36 (مقابلMAX11290GNX+ (2-channel variant))
- Industry-leading 100 dB SNR at 1.4 mA (مقابلADS131M04W (2.0 mA at 100 dB))
- WLP package option for ultra-compact designs (مقابلAD7195 (LFCSP-32))
ملاحظات التصميم
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.
معلومات الامتثال
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.
