MAX11291ENX+CGQ - 24-bit 6ch Sigma-Delta ADC, 100dB SNR | Maxim Integrated
MPN: MAX11291ENX+CGQ ✓ NakahandaMAX11291ENX+CGQ Ulas
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.
Mga alternatibo na pwedeng ilagay na MAX11291ENX+CGQ — parehas na package, pin-to-pin na katugmang. Hindi kasama ang mga bahagi ng iba't-ibang package na nangangailangan ng pagpapaayos ng PCB.
MAX11291ENX+TCGQ
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
MAX11291GNX+
✅ Drop-In ⚠️ Mga Talaan Hindi Naiwerikmo📋 Alternatibo na Reference (hindi sa katalogo)
MAX11290GNX+
✅ Drop-In ⚠️ Mga Talaan Hindi Naiwerikmo📋 Alternatibo na Reference (hindi sa katalogo)
ADS131M04W
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
AD7195
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
MAX11291ENX+CGQ Mga Pinakamataas na Rating at Electrical Characteristics
| Pangangasiwaan | 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 |
| Kuru-kuryente ng Pagbibigay | 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 |
| Packhaging | WLP-36 (3.5x3.5 mm, 0.4 mm pitch) |
| Uri ng Pagpapasok | Surface Mount |
| Tindminan RoHS | Compliant |
Pin Configuration ng MAX11291ENX+CGQ
| Pin A1 | GND — Ground |
| Pin A2 | AIN0P — Analog input 0 positive |
| Pin A3 | AIN0N — Analog input 0 negative |
| Pin A4 | AIN1P — Analog input 1 positive |
| Pin A5 | AIN1N — Analog input 1 negative |
| Pin A6 | AVDD — Analog supply 2.7V-3.6V |
| Pin B1 | GND — Ground |
| Pin B2 | AIN2P — Analog input 2 positive |
| Pin B3 | AIN2N — Analog input 2 negative |
| Pin B4 | AIN3P — Analog input 3 positive |
| Pin B5 | AIN3N — Analog input 3 negative |
| Pin B6 | REFOUT — Reference output |
| Pin C1 | GND — Ground |
| Pin C2 | AIN4P — Analog input 4 positive |
| Pin C3 | AIN4N — Analog input 4 negative |
| Pin C4 | AIN5P — Analog input 5 positive |
| Pin C5 | AIN5N — Analog input 5 negative |
| Pin C6 | REFIN — Reference input |
| Pin D1 | DVDD — Digital supply |
| Pin D2 | CS — Chip select (active low) |
| Pin D3 | SCLK — SPI clock |
| Pin D4 | DIN — SPI data in |
| Pin D5 | DOUT — SPI data out |
| Pin D6 | DRDY — Data ready output |
| Pin E1 | GND — Ground |
| Pin E2 | RESET — Reset input (active low) |
| Pin E3 | GPIO0 — General purpose I/O 0 |
| Pin E4 | GPIO1 — General purpose I/O 1 |
| Pin E5 | XIN — Crystal oscillator input |
| Pin E6 | XOUT — Crystal oscillator output |
| Pin F1 | GND — Ground |
| Pin F2 | NC — Not connected (per datasheet) |
| Pin F3 | NC — Not connected (per datasheet) |
| Pin F4 | NC — Not connected (per datasheet) |
| Pin F5 | TEMP_SENSE — On-chip temperature sensor |
| Pin F6 | GND — Ground |
Tipikal na mga Gamit
MAX11291ENX+CGQ ay nararapat para sa 6 aplikasyons: 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.
Inirekomenda
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.
Inirekomenda
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.
Inirekomenda
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.
Inirekomenda
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.
Inirekomenda
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.
Inirekomenda
Buod ng mga Inirekomendang Produkto
Impormasyon ng Talumpati sa Engineering for MAX11291ENX+CGQ — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Ikabit sa Mga Alternatibo
| Parametro | Ito ang Producto | 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 |
Pangunahing mga Pagkakaiba
- 6 differential channels in smallest-in-class WLP-36 (kumpara saMAX11290GNX+ (2-channel variant))
- Industry-leading 100 dB SNR at 1.4 mA (kumpara saADS131M04W (2.0 mA at 100 dB))
- WLP package option for ultra-compact designs (kumpara saAD7195 (LFCSP-32))
Talaan ng Disenyo
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.
Impormasyon ng Pagsunod sa Kautusan
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.
