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Home > Products > Integrated Circuits (ICs) > Data Acquisition > Analog to Digital Converters (ADC)

Analog Devices Inc./Maxim Integrated MAX11040GUU+T

Name: MAX11040GUU+T
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX11040GUU+T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX11040GUU+T

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Analog to Digital Converters (ADC)

Package:: 38-TFSOP (0.173", 4.40mm Width)

Datasheet:: MAX11040GUU+T.pdf

Description:: IC ADC 24BIT SIGMA-DELTA 38TSSOP

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Product details

Overview

MAX11040GUU+T from Maxim Integrated is a 24-bit, 4-channel simultaneous-sampling sigma-delta ADC with cascading capability for up to 32 synchronized channels, 117dB SNR at 1ksps, ±2.2V differential input range using internal 2.5V reference, and ±6V overvoltage protection - deployed in multiphase power metering and industrial energy measurement systems.

For engineers reviewing the MAX11040GUU+T datasheet, MAX11040GUU+T pinout, MAX11040GUU+T application, or MAX11040GUU+T equivalent, key selection criteria include simultaneous sampling integrity, programmable phase delay (0–333μs), 0.065% output data rate resolution, SPI/QSPI/MICROWIRE compatibility, and -40°C to +105°C industrial temperature operation.

Technical Context

The MAX11040GUU+T integrates four independent sigma-delta modulators with dedicated 24-bit digital decimation filters, each accepting fully differential analog inputs. Its internal crystal oscillator (24.576MHz) or external clock drives a fixed 8× division to generate the 3.072MHz modulator clock, enabling precise timing control across all channels.

It supports daisy-chained synchronization via CASCIN/CASCOUT and global timing alignment through SYNC input, allowing coordinated sampling across up to eight devices. The on-chip digital filter provides programmable -3dB bandwidth (0.11–13.5kHz) scaling linearly with output data rate (0.25–64ksps), with passband flatness <±0.1dB up to 1.74kHz at 16ksps.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	24-bit - delivers 144dB theoretical dynamic range for high-accuracy RMS and harmonic analysis in energy meters.
SNR	117dB at 1ksps - enables sub-0.001% RMS amplitude error for 0.1% full-scale 62.5Hz sine-wave inputs.
Input Range	±2.2V differential - compatible with standard CT/PT signal conditioning stages without external gain scaling.
Overvoltage Protection	±6V on AIN+/AIN− - eliminates need for external clamping diodes in harsh industrial environments.
Output Data Rate	0.25–64ksps with 0.065% resolution - allows fine-grained tracking of grid frequency drift (e.g., 49.95–50.05Hz) in real time.
Channel-to-Channel Phase Matching	0.0001° - ensures <10ns inter-channel skew for accurate vector-based power calculations (P, Q, S).
Supply Voltage	AVDD = 3.0–3.6V, DVDD = 2.7–VAVDD - single-supply operation simplifies PCB power architecture.

Pinout & Package

MAX11040GUU+T is housed in a 38-pin TSSOP package (JEDEC MO-153), optimized for thermal performance and board-level noise immunity in high-density industrial layouts. Pin spacing is 0.5mm, body width 4.4mm, and total footprint 9.7 × 4.4 mm.

Pin/Terminal	Circuit Role	Design Meaning
1, 5, 34, 38	AIN0− / AIN1− / AIN3− / AIN2−	Negative differential analog inputs - each paired with corresponding AIN+ for true fully differential acquisition.
2, 6, 33, 37	AIN0+ / AIN1+ / AIN3+ / AIN2+	Positive differential analog inputs - matched impedance and layout-critical for CMRR >109dB.
3, 7, 32, 36	REF0 / REF1 / REF3 / REF2	Per-channel buffered reference outputs - require 1µF bypass to AGND to stabilize modulator reference nodes.
9	REFIO	Reference I/O - supplies 2.5V (±50ppm/°C drift) when internal mode enabled; accepts 2.3–2.7V external reference.
13, 14	CASCIN / CASCOUT	Daisy-chain control - enables single-SPI bus to read all 32 channels from eight cascaded devices with one command.
15–18	CS / SCLK / DIN / DOUT	SPI-compatible 4-wire interface - supports CPOL=1, CPHA=0; DOUT active on SCLK rising edge, DIN sampled on falling edge.
19, 20	FAULT / OVRFLW	Open-drain fault indicators - FAULT asserts on ±6V input excursion; OVRFLW signals overflow or FAULT condition.
24	SYNC	Sampling alignment input - falling edge synchronizes conversion start across multiple devices, critical for multi-phase sync.
25, 26	XOUT / XIN	Crystal oscillator terminals - accept 24.576MHz fundamental-mode crystal (ESR <30Ω); CLKOUT (pin 21) buffers this clock.
30	AVDD	Analog supply - requires local 1µF + 0.01µF bypass to AGND; powers modulators, references, and analog front-end.
12, 27	DVDD	Digital supply - 2.7V to VAVDD; powers serial interface, registers, and digital filter logic.
4, 8, 10, 29, 31, 35	AGND	Analog ground - must be isolated from DGND except at single-point star connection to minimize digital noise coupling.
11, 28	DGND	Digital ground - return path for DVDD, SPI signals, and fault outputs; connects to system digital plane.

Key Features

Feature	Design Value
Four fully differential simultaneously sampled channels	Eliminates time-skew errors in polyphase voltage/current acquisition - essential for IEEE 1459-compliant power calculations.
Programmable per-channel sampling phase (0–333μs in 1.33μs steps)	Compensates for fixed group delay introduced by anti-aliasing filters, current transformers, or isolation amplifiers.
0.065% output data rate resolution	Enables precise grid-frequency tracking (e.g., 50.000Hz ±0.0325Hz) without interpolation or resampling artifacts.
±6V overvoltage protected analog inputs	Withstands transient surges per IEC 61000-4-5 Level 3 (2kV surge) without external protection components.
Internal 24.576MHz crystal oscillator with CLKOUT buffer	Provides jitter-free master clock for synchronized multi-device systems; CLKOUT drives up to 8 downstream loads.
On-chip digital filter with scalable -3dB bandwidth (0.11–13.5kHz)	Matches anti-aliasing requirements across variable sampling rates - avoids external FIR filter design effort.

Applications

Power-Protection Relay Equipment	Multiphase Power Systems
Use Scenario: Real-time detection of overcurrent, earth fault, and directional power flow in medium-voltage feeder protection relays. IC Role / Device Role / Timing Role: Simultaneous acquisition of 3-phase voltage and current (4 channels) with <10ns inter-channel skew for angle-sensitive trip decisions. Use Value: Enables IEC 60255-118 Class T1 compliance with <1ms total operating time, leveraging 117dB SNR for reliable low-level fault detection.	Use Scenario: High-precision energy metering in 3-phase 4-wire utility meters with neutral current monitoring. IC Role / Device Role / Timing Role: Four-channel simultaneous sampling captures voltage (V_a, V_b, V_c) and neutral current (I_n) at exact same instant for true vector summation. Use Value: Achieves 0.05% accuracy over 1000:1 dynamic range (per IEC 62053-22 Class 0.5S), supported by 0.25% error spec and channel-to-channel gain matching ≤0.03%FS.
Industrial Data-Acquisition Systems	Medical Instrumentation
Use Scenario: Modular DAQ modules for predictive maintenance in motor control cabinets, capturing vibration, temperature, and current waveforms. IC Role / Device Role / Timing Role: Cascadable architecture scales to 32 synchronized channels across eight MAX11040GUU+T units on single SPI bus for multi-sensor correlation. Use Value: Reduces system BOM and FPGA resource count by eliminating external synchronization logic and discrete clock distribution networks.	Use Scenario: High-fidelity bio-potential acquisition in portable ECG/EMG analyzers requiring low-noise, high-common-mode-rejection front-end. IC Role / Device Role / Timing Role: Fully differential inputs with 109dB CMRR and 130kΩ input impedance reject electrode motion artifacts and 50/60Hz interference. Use Value: Delivers diagnostic-grade waveform fidelity (THD = –94dB at +25°C) without post-processing, meeting AHA/IEC 60601-2-27 requirements.

Power-Protection Relay Equipment

Multiphase Power Systems

Use Scenario: Real-time detection of overcurrent, earth fault, and directional power flow in medium-voltage feeder protection relays.

IC Role / Device Role / Timing Role: Simultaneous acquisition of 3-phase voltage and current (4 channels) with <10ns inter-channel skew for angle-sensitive trip decisions.

Use Value: Enables IEC 60255-118 Class T1 compliance with <1ms total operating time, leveraging 117dB SNR for reliable low-level fault detection.

Use Scenario: High-precision energy metering in 3-phase 4-wire utility meters with neutral current monitoring.

IC Role / Device Role / Timing Role: Four-channel simultaneous sampling captures voltage (V_a, V_b, V_c) and neutral current (I_n) at exact same instant for true vector summation.

Use Value: Achieves 0.05% accuracy over 1000:1 dynamic range (per IEC 62053-22 Class 0.5S), supported by 0.25% error spec and channel-to-channel gain matching ≤0.03%FS.

Industrial Data-Acquisition Systems

Medical Instrumentation

Use Scenario: Modular DAQ modules for predictive maintenance in motor control cabinets, capturing vibration, temperature, and current waveforms.

IC Role / Device Role / Timing Role: Cascadable architecture scales to 32 synchronized channels across eight MAX11040GUU+T units on single SPI bus for multi-sensor correlation.

Use Value: Reduces system BOM and FPGA resource count by eliminating external synchronization logic and discrete clock distribution networks.

Use Scenario: High-fidelity bio-potential acquisition in portable ECG/EMG analyzers requiring low-noise, high-common-mode-rejection front-end.

IC Role / Device Role / Timing Role: Fully differential inputs with 109dB CMRR and 130kΩ input impedance reject electrode motion artifacts and 50/60Hz interference.

Use Value: Delivers diagnostic-grade waveform fidelity (THD = –94dB at +25°C) without post-processing, meeting AHA/IEC 60601-2-27 requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-accuracy simultaneous-sampling ADC applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AD7606C-24	18-bit SAR architecture, 200ksps max, no internal oscillator, requires external reference and clock; lower SNR (105dB @ 10ksps).	Better suited for transient capture (e.g., arc-flash detection) but lacks sigma-delta's inherent 50/60Hz notch rejection and DC stability.	Select AD7606C-24 when higher throughput and lower latency (<1μs) outweigh SNR and power trade-offs.
ADS131M04	24-bit delta-sigma, 64ksps, integrated PGA and burn-out current sources; no cascading support; 102dB SNR @ 1ksps.	Optimized for sensor signal chains (e.g., strain gauges) with on-chip excitation, but lacks per-channel programmable phase delay.	Select ADS131M04 for compact 4-channel sensor nodes where PGA gain flexibility matters more than multi-device synchronization.

Compared with AD7606C-24 and ADS131M04, MAX11040GUU+T uniquely combines 24-bit sigma-delta precision, hardware-supported cascading, and per-channel phase compensation - making it the only choice for metrology-grade synchronized multi-device energy measurement systems.

Availability

MAX11040GUU+T is available at Aetrix Electronics and suitable for power-protection relay equipment, multiphase power systems, and industrial data-acquisition systems requiring stable component supply across extended product lifecycles.

Supply support for MAX11040GUU+T 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 industrial, medical, and communications infrastructure.

The MAX11040GUU+T belongs to Maxim's high-accuracy energy measurement ADC family, engineered specifically for metrology-grade simultaneous sampling in revenue-grade electricity meters and protection-class relays.

FAQ

What is the maximum number of MAX11040GUU+T devices that can be cascaded for synchronized sampling?

The MAX11040GUU+T supports hardware daisy-chaining of up to eight devices using CASCIN/CASCOUT pins, enabling synchronized sampling across 32 fully differential analog input channels. This configuration uses a single SPI interface with one chip-select line, reducing host controller GPIO count and simplifying firmware implementation for large-scale acquisition systems.

Does MAX11040GUU+T support both internal and external reference modes?

Yes, MAX11040GUU+T supports dual reference operation: internal mode delivers a 2.5V ±50ppm/°C reference via REFIO pin, while external mode accepts 2.3V–2.7V reference sources. REFIO must be bypassed with a 1µF capacitor to AGND in either mode, and each channel's REF0–REF3 pins require individual 1µF bypassing for optimal modulator stability.

How does the programmable sampling phase in MAX11040GUU+T improve measurement accuracy?

The MAX11040GUU+T provides per-channel programmable sampling phase delay (0–333μs in 1.33μs steps) to compensate for fixed group delay introduced by external components such as current transformers (CTs), potential transformers (PTs), or anti-aliasing filters. This correction ensures true time-aligned acquisition across all four channels, critical for vector-based power calculations and harmonic analysis.

What is the purpose of the FAULT and OVRFLW pins on MAX11040GUU+T?

FAULT is an open-drain output that asserts low when any analog input exceeds ±6V relative to AGND, indicating overvoltage fault. OVRFLW also open-drain, asserts low on data overflow (conversion result beyond ±2.2V) or when FAULT is active. Both pins feature 30kΩ internal pullups and support wire-NOR connection for centralized fault monitoring across cascaded devices.

Can MAX11040GUU+T operate without an external crystal?

Yes, MAX11040GUU+T can operate without an external crystal by driving the XIN pin with an external 24.576MHz clock source while leaving XOUT unconnected. The internal crystal oscillator is disabled via the XTALEN bit in the configuration register. This mode maintains full timing precision and supports the same 0.065% output data rate resolution and synchronization features as crystal-based operation.

MAX11040GUU+T Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 38-TFSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Number of Bits:: 24

Sampling Rate (Per Second):: 64k

Number of Inputs:: 4

Input Type:: Differential

Data Interface:: SPI

Configuration:: S/H-ADC

Ratio - S/H:ADC:: 1:1

Number of A/D Converters:: 4

Architecture:: Sigma-Delta

Reference Type:: External, Internal

Voltage - Supply, Analog:: 3V ~ 3.6V

Voltage - Supply, Digital:: 2.7V ~ 3.6V

Features:: Simultaneous Sampling

Operating Temperature:: -40°C ~ 105°C

Supplier Device Package:: 38-TSSOP

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

MAX11040GUU+T FAQ

1.How can I place an order for MAX11040GUU+T through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX11040GUU+T 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 MAX11040GUU+T reliable?

The price and inventory of MAX11040GUU+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX11040GUU+T is usually 5 days.

3.What payment methods are accepted for MAX11040GUU+T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX11040GUU+T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX11040GUU+T?

MAX11040GUU+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX11040GUU+T 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 MAX11040GUU+T?

For technical support, including MAX11040GUU+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX11040GUU+T requirements.

6.How does Aetrix verify that MAX11040GUU+T is sourced from the original manufacturer or authorized distributors?

All MAX11040GUU+T 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 MAX11040GUU+T meets industry standards.

7.What is the process for return or replacement of MAX11040GUU+T?

All MAX11040GUU+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX11040GUU+T, 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 MAX11040GUU+T part is unused and in its original packaging.

Return procedure for MAX11040GUU+T:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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