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Analog Devices Inc./Maxim Integrated MAX11261SYS1#
- Part No.:
- MAX11261SYS1#
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- Datasheet:
-
MAX11261SYS1#.pdf
- Description:
- EVAL BOARD FOR MAX11261
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Product details
Overview
The MAX11261SYS1# from Maxim Integrated is a 24-bit, 6-channel delta-sigma ADC with integrated programmable gain amplifier (PGA), I²C interface, 64-entry FIFO, and 6.2nV/√Hz low-noise PGA mode - enabling precision DC measurements in battery-powered instrumentation, medical sensors, and wearable electronics.
For engineers reviewing the MAX11261SYS1# datasheet, MAX11261SYS1# pinout, MAX11261SYS1# application, or MAX11261SYS1# equivalent, this page delivers verified electrical specs, wafer-level package mapping, I²C timing compliance (Fast-Mode Plus), PGA gain calibration behavior, and real-world use-value for high-impedance sensor interfacing and autonomous scan monitoring.
Technical Context
The MAX11261SYS1# integrates a fourth-order, unconditionally stable delta-sigma modulator with a variable-decimation SINC digital filter, supporting up to 16ksps continuous conversion and on-demand self/system gain/offset calibration. Its internal 8.192MHz system clock eliminates external crystal requirements.
It features a fully differential analog signal path with six independent AINP/AINN input pairs, dual reference inputs (REFP/REFN), and a configurable PGA offering eight discrete gains (1x–128x) in two noise modes: 6.2nV/√Hz (low-noise) and 10nV/√Hz (low-power). The device supports both bipolar (±VREF) and unipolar (0–VREF) input ranges via CTRL1 register control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit effective - delivers >110dB SNR at 1ksps, enabling sub-microvolt RMS resolution in precision weigh-scale and pressure sensor front-ends. |
| Sample Rate | Up to 16ksps continuous - supports real-time monitoring of fast-changing biomedical signals while maintaining DC accuracy. |
| PGA Noise Density | 6.2nV/√Hz (low-noise mode) - allows direct connection to high-impedance thermocouples or strain gauges without external amplification. |
| INL Error | 3ppm typical - ensures <0.0003% full-scale linearity error across temperature, critical for metrology-grade calibration. |
| Supply Range | Analog: 2.7V–3.6V; Digital: 1.7V–3.6V (LDO configurable) - enables seamless integration with 1.8V/3.3V microcontrollers and ultra-low-power SoCs. |
| FIFO Depth | 64 entries - reduces host processor polling frequency by >90% in autonomous scan mode, cutting system power in battery-operated devices. |
| Operating Temp | −40°C to +85°C - qualified for industrial and medical environments where thermal drift must remain below 50nV/°C zero-drift. |
Pinout & Package
MAX11261SYS1# uses a 6×6 bump, 0.4mm pitch, 2.838mm × 2.838mm × 0.5mm wafer-level package (WLP) with RoHS-compliant N362B2+2 outline. Land pattern follows Application Note 1891.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0P–AIN5P / AIN0N–AIN5N | Differential analog inputs (6 channels) | Accept fully differential sensor signals; support direct PGA bypass or buffered acquisition with 128× gain and 0.15μVRMS input-referred noise at 1ksps. |
| REFP / REFN | Differential reference voltage inputs | Accept external 1.5V–VAVDD reference; common-mode range 0.75V to VAVDD − 0.75V ensures stability with ratiometric bridge sensors. |
| CAPP / CAPN | PGA output filter nodes | Require 1nF C0G capacitor between pins to suppress high-frequency noise before delta-sigma modulator sampling. |
| SDA / SCL / ADR0 / ADR1 | I²C interface and address configuration | Support Standard, Fast, and Fast-Mode Plus (1MHz); ADR0/ADR1 set one of four I²C addresses (0x68–0x6B) for multi-device bus sharing. |
| RDYB_INTB | Active-low open-drain interrupt/FIFO status | Asserts low on new FIFO data or out-of-range detection - enables event-driven wake-up without continuous polling. |
| GPO0–GPO5 / GPOGND | General-purpose analog switches (current-sink only) | Each GPO connects to GPOGND when enabled; used for multiplexing external sensors or driving low-side loads up to 30mA per channel. |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous Scan Mode | Configurable sequencer monitors all 6 channels without host intervention; triggers RDYB_INTB only on out-of-range events - cuts average system current by >70% in wearables. |
| On-Demand Calibration | Self-calibration (zero/gain) and system calibration (external reference) executed in firmware; adds ≤80 master clocks per conversion but eliminates manual trim components. |
| Two Power-Down States | SLEEP mode draws 1μA AVDD current; STANDBY draws 1.5μA AVDD + 50μA DVDD - enables sub-μA standby in portable medical monitors. |
| High Common-Mode Rejection | 130dB DC CMR and 130dB 50/60Hz rejection - rejects EMI and mains interference in noisy industrial sensor nodes without external filtering. |
| ESD Robustness | ±2.5kV HBM / 750V CDM - survives handling and board-level surge in clinical and field-deployed equipment. |
Applications
| Wearable Health Monitoring | Medical Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous ECG/PPG signal digitization in compact patch-style monitors with coin-cell battery life targets >7 days. IC Role / Device Role / Timing Role: Primary 24-bit ADC capturing differential biopotential signals at 1ksps with PGA gain = 128 and low-noise mode enabled. Use Value: 0.15μVRMS input-referred noise and 3ppm INL ensure accurate R-wave amplitude tracking and beat-to-beat interval measurement without post-processing correction. |
Use Scenario: Multi-parameter patient monitor acquiring temperature, respiration, and blood oxygen saturation from analog sensor arrays. IC Role / Device Role / Timing Role: Central sensor hub ADC performing autonomous scan across 6 channels with programmable delay and FIFO buffering. Use Value: 64-entry FIFO and RDYB_INTB interrupt reduce MCU wake-ups by 95%, extending runtime in Class II medical devices operating under IEC 60601-1 leakage limits. |
| Industrial Weigh Scale Front-End | Low-Power Pressure Transducer Interface |
Use Scenario: High-accuracy platform scale using 4-wire load cell with ratiometric excitation and 24-bit resolution requirement. IC Role / Device Role / Timing Role: Delta-sigma ADC with REFP/REFN tied to load cell excitation voltage; PGA gain = 64; unipolar mode. Use Value: 6.2nV/√Hz PGA noise and 110dB CMR reject thermally induced common-mode shifts and cable-induced pickup in factory-floor environments. |
Use Scenario: Battery-powered HVAC pressure sensor node requiring 10-year operation on AA cells. IC Role / Device Role / Timing Role: Low-power ADC sampling piezoresistive bridge at 100sps, entering SLEEP mode between conversions. Use Value: 1μA AVDD sleep current and on-demand calibration eliminate need for external trim pots or temperature compensation ICs - reducing BOM count by 3 components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution, low-power delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1263IPWR | 32-bit resolution, SPI interface, no integrated PGA; higher 2.5nV/√Hz noise floor but includes internal reference and burnout current sources. | Requires external PGA for high-impedance sensors; better suited for lab-grade instrumentation than space-constrained wearables. | Select ADS1263IPWR when absolute highest resolution and internal reference stability outweigh size and I²C compatibility needs. |
| AD7177-2BRUZ | 32-bit, 10ksps, SPI-only, 5.5nV/√Hz noise, integrated 2.5V reference; consumes 3.5mA active current vs. MAX11261SYS1#'s 4.2mA (PGA low-noise). | Lacks autonomous scan and FIFO-based interrupt; requires continuous host polling or external logic for multi-channel sequencing. | Choose AD7177-2BRUZ for high-throughput industrial DAQ where SPI bandwidth and integrated reference simplify layout, not for ultra-low-power edge sensing. |
Compared with ADS1263IPWR and AD7177-2BRUZ, the MAX11261SYS1# uniquely combines I²C simplicity, integrated PGA, autonomous scan, and sub-μA sleep - making it optimal for compact, battery-limited systems where sensor intelligence resides at the edge rather than in the host MCU.
Availability
MAX11261SYS1# is available at Aetrix Electronics and suitable for wearable electronics, medical equipment, and battery-powered instrumentation requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant wafer-level packaging.
Supply support for MAX11261SYS1# includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications - emphasizing low power, high accuracy, and small form factor.
The MAX11261SYS1# belongs to Maxim's ultra-low-power, high-resolution delta-sigma ADC product line, engineered specifically for energy-constrained sensor nodes that require metrology-grade accuracy without external support circuitry.
FAQ
What is the maximum supported I²C clock frequency for MAX11261SYS1#?
The MAX11261SYS1# supports Standard Mode (100kHz), Fast Mode (400kHz), and Fast-Mode Plus (1MHz) I²C operation. Fast-Mode Plus is required to achieve the full 16ksps data rate in continuous conversion mode. The device meets all timing specifications per JEDEC JESD79–2E, including tLOW ≥ 0.5μs and tSU;DAT ≥ 50ns at 1MHz with proper bus capacitance (≤550pF).
Does MAX11261SYS1# require an external crystal or oscillator?
No - the MAX11261SYS1# integrates a factory-trimmed 8.192MHz internal oscillator that serves as the system clock for both analog and digital blocks. This eliminates external timing components, reduces PCB area, and improves reliability in shock/vibration-prone applications like portable medical devices.
How does the PGA on MAX11261SYS1# affect input voltage range?
When the PGA is enabled, the MAX11261SYS1#'s absolute input common-mode range narrows to VAVSS + 0.3V to VAVDD − 1.3V (vs. VAVSS to VAVDD in bypass mode). This is due to internal PGA headroom requirements. Exceeding this range degrades linearity and increases distortion - design must ensure AINP/AINN stay within CMIRNG per Electrical Characteristics Table.
Can MAX11261SYS1# perform automatic channel scanning without MCU intervention?
Yes - the MAX11261SYS1# includes a hardware sequencer supporting four autonomous scan modes. In Mode 4, it continuously monitors all six channels, applies user-defined thresholds, and asserts RDYB_INTB only when an input exceeds limits - enabling true "set-and-forget" sensor monitoring in battery-powered edge nodes.
What is the purpose of the CAPREG pin on MAX11261SYS1#?
The CAPREG pin on MAX11261SYS1# outputs a regulated 1.8V sub-supply derived from DVDD, intended to power external components like reference buffers or level shifters. It must be decoupled with a 220nF X7R capacitor to DGND. When driven externally with 1.8V, CAPREG and DVDD bumps must be shorted on the PCB to disable the internal regulator.
MAX11261SYS1# Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Box
- Product Status:
- Active
- Number of A/D Converters:
- 1
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 16k
- Data Interface:
- I2C
- Input Range:
- ±VREF
- Power (Typ) @ Conditions:
- -
- Utilized IC / Part:
- MAX11261
- Contents:
- Board(s)
MAX11261SYS1# FAQ
1.How can I place an order for MAX11261SYS1# through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX11261SYS1# on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX11261SYS1# reliable?
The price and inventory of MAX11261SYS1# are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX11261SYS1# is usually 5 days.
3.What payment methods are accepted for MAX11261SYS1#?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX11261SYS1# transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX11261SYS1#?
MAX11261SYS1# orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX11261SYS1# order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX11261SYS1#?
For technical support, including MAX11261SYS1# datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX11261SYS1# requirements.
6.How does Aetrix verify that MAX11261SYS1# is sourced from the original manufacturer or authorized distributors?
All MAX11261SYS1# products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX11261SYS1# meets industry standards.
7.What is the process for return or replacement of MAX11261SYS1#?
All MAX11261SYS1# units undergo pre-shipment inspection (PSI). If there is an issue with MAX11261SYS1#, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX11261SYS1# part is unused and in its original packaging.
Return procedure for MAX11261SYS1#:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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