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Analog Devices Inc./Maxim Integrated MAX11044ECB+T
- Part No.:
- MAX11044ECB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-TQFP Exposed Pad
- Datasheet:
-
MAX11044ECB+T.pdf
- Description:
- IC ADC 16BIT SAR 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,219
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Product details
Overview
MAX11044ECB+T from Maxim Integrated is a 4-channel, 16-bit simultaneous-sampling analog-to-digital converter (ADC) with independent track-and-hold per channel, 250ksps throughput per channel, ±5V input range, and 20MHz parallel interface. It operates from 4.75V–5.25V analog and 2.7V–5.25V digital supplies, and is used in multiphase motor control and power-grid protection systems requiring precise synchronized acquisition.
For engineers reviewing the MAX11044ECB+T datasheet, MAX11044ECB+T pinout, MAX11044ECB+T application, or MAX11044ECB+T equivalent, this page delivers verified specifications, package mapping, functional pin definitions, real-world use cases, and validated alternative options for industrial data acquisition designs.
Technical Context
The MAX11044ECB+T implements SAR architecture with dedicated T/H circuitry per input channel, enabling true simultaneous sampling across all four analog inputs. Its internal 4.096V reference supports ±5V full-scale operation, while external reference support (3.0V–4.25V) allows configurable input ranges from ±4.0V to ±5.2V.
It features a 20MHz bidirectional parallel interface with active-low RD/WR/CS control, EOC signaling, and configuration register access via DB0–DB3 pins. Channel-to-channel T/H matching is 100ps, aperture delay is 10ns, and input clamping provides ±20mA overrange protection per channel with external resistor limiting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 1 LSB = 152.6 µV step size over ±5V range for high-precision voltage monitoring |
| Sampling Rate | 250ksps per channel - enables real-time capture of 50kHz fundamental waveforms with >5× oversampling |
| Input Range | ±5V - matches standard industrial sensor outputs and isolation amplifier interfaces without level-shifting |
| SNR / SINAD | 92.3dB / 92.0dB at 10kHz - ensures <0.008% RMS noise contribution in 16-bit dynamic range applications |
| Channel Matching | ±0.01% FSR gain error matching - critical for phase-angle accuracy in 3-phase power measurement |
| Supply Voltages | AVDD: 4.75–5.25V; DVDD: 2.7–5.25V - allows direct interfacing with 3.3V or 5V microcontrollers without level shifters |
| Operating Temp | –40°C to +85°C - qualified for deployment in outdoor substations and factory-floor motor drives |
Pinout & Package
MAX11044ECB+T is housed in a 64-pin TQFP-EP (10mm × 10mm) package with exposed pad connected internally to AGND. Pin functions are defined per Maxim's official pinout for the TQFP variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH3 | Analog Input Channels | Four fully differential-capable inputs with ±7.5V absolute max rating and ±20mA clamp protection |
| DB0–DB15 | Parallel Data Bus | 16-bit bidirectional bus; DB0–DB3 double as configuration register inputs (CR0–CR3) |
| CONVST | Convert Start | Rising edge initiates simultaneous sampling and conversion; defines acquisition window timing |
| EOC | End-of-Conversion | Active-low open-drain output signals completion; synchronizes host read cycle with conversion latency |
| RD / WR / CS | Control Interface | Standard 3-wire parallel protocol: RD advances channel data, WR loads config, CS enables device |
| REFIO | Reference I/O | Internal 4.096V reference output or external reference input (3.0–4.25V); bypassed with 0.1µF to AGND |
| RDC / RDC_SENSE | Reference Decoupling | RDC requires ≥80µF total capacitance to AGND; RDC_SENSE feeds back to stabilize reference buffer |
| AVDD / DVDD / AGND / DGND | Power & Ground | Separate analog/digital supplies and grounds minimize noise coupling; AVDD/DVDD require local 0.1µF bypassing |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous Sampling | Independent T/H per channel with 100ps channel-to-channel matching ensures phase-coherent acquisition for multi-sensor systems |
| Overrange Protection | Integrated ±20mA input clamps enable robust front-end design using only one external current-limiting resistor per channel |
| Flexible Reference | Switchable between precision 4.096V internal reference (±5ppm/°C) and user-supplied 3.0–4.25V external reference |
| Low Aperture Jitter | 50ps RMS jitter preserves SNR at high input frequencies-critical for FFT-based vibration analysis up to Nyquist (125kHz) |
| Shutdown Mode | 10µA total shutdown current (IAVDD + IDVDD) enables low-power standby in battery-backed monitoring systems |
| High Input Impedance | 1GΩ typical input impedance minimizes loading on high-Z sensor sources such as piezoelectric accelerometers |
Applications
| Power-Factor Monitoring | Multiphase Motor Control |
|---|---|
|
Use Scenario: Real-time measurement of voltage and current waveforms across three AC phases to compute displacement power factor and harmonic distortion. IC Role / Device Role / Timing Role: Simultaneous 4-channel acquisition captures synchronized V-A pairs (e.g., VA, IA, VB, IB) with sub-100ps channel alignment to preserve phase relationships. Use Value: Enables accurate reactive power calculation and IEEE 519-compliant THD analysis without inter-channel skew-induced errors. |
Use Scenario: Closed-loop field-oriented control (FOC) of 3-phase PMSM/BLDC motors using back-EMF and current feedback. IC Role / Device Role / Timing Role: Simultaneous sampling of two motor-phase currents and DC-link voltage ensures instantaneous torque estimation and PWM synchronization. Use Value: Eliminates phase lag between current samples, improving torque ripple suppression and enabling >20kHz PWM switching. |
| Power-Grid Protection | Vibration Analysis |
|
Use Scenario: Fault detection in transmission line relays by capturing transient overvoltage/overcurrent events during lightning strikes or short circuits. IC Role / Device Role / Timing Role: High-speed 250ksps sampling captures sub-cycle transients; ±5V range interfaces directly with CT/PT signal conditioners. Use Value: Supports IEC 61850-9-2 LE sample values with sufficient resolution and timing fidelity for Class TPS/TPI protection algorithms. |
Use Scenario: Structural health monitoring of rotating equipment using accelerometer and velocity transducer outputs. IC Role / Device Role / Timing Role: Simultaneous acquisition of multiple vibration channels (e.g., X/Y/Z axes) preserves coherence for modal analysis and envelope demodulation. Use Value: 92.3dB SNR enables detection of bearing fault harmonics buried 30dB below fundamental vibration energy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar simultaneous-sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7606C-16 | 8-channel, 16-bit, 1MSPS, integrated analog front-end (PGA, anti-alias filter), SPI-only interface | Higher channel count and integrated signal conditioning simplify BOM but require SPI host and lack parallel interface flexibility | Select when system prioritizes channel density and analog integration over parallel bus speed and discrete T/H control |
| ADS8684 | 4-channel, 16-bit, 500ksps, single-supply (4.75–5.25V), SPI interface, no internal reference | Lower power (25mW vs. 120mW), no simultaneous sampling (sequential with 250ns inter-channel delay), requires external reference | Select for lower-cost, lower-power applications where 250ns inter-channel skew is acceptable and SPI is preferred |
Compared with AD7606C-16 and ADS8684, the MAX11044ECB+T uniquely balances true simultaneous sampling, parallel interface speed, and ±5V input compatibility-making it optimal for legacy industrial controllers requiring deterministic timing and minimal firmware overhead.
Availability
MAX11044ECB+T is available at Aetrix Electronics and suitable for power-grid protection, multiphase motor control, and automatic test equipment requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX11044ECB+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 high-performance analog and mixed-signal ICs for industrial, automotive, and communications applications.
The MAX11044ECB+T belongs to Maxim's precision simultaneous-sampling ADC family, engineered specifically for industrial power monitoring, motor control, and protection relay systems demanding synchronized multi-channel acquisition with metrology-grade accuracy.
FAQ
What is the maximum sampling rate per channel for the MAX11044ECB+T?
The MAX11044ECB+T achieves 250ksps per channel with true simultaneous sampling across all four inputs. This rate is guaranteed over the full –40°C to +85°C temperature range and with both internal and external reference configurations. The 3µs conversion time and 1000µs acquisition window support stable settling for high-impedance sources, and the timing is fully specified in the datasheet's "Timing Characteristics" table under fSAMPLE = 250ksps conditions.
Does the MAX11044ECB+T support external reference input?
Yes, the MAX11044ECB+T supports external reference input via the REFIO pin, accepting voltages from 3.0V to 4.25V. This allows users to configure full-scale input ranges from ±4.0V to ±5.2V depending on reference selection. When using an external reference, the internal 4.096V reference is disabled, and REFIO must be bypassed with a 0.1µF capacitor to AGND. The device maintains specified INL, DNL, and SNR performance across the supported external reference range.
What package type and pin count does the MAX11044ECB+T use?
The MAX11044ECB+T uses a 64-pin TQFP-EP (thin quad flat pack with exposed pad) package measuring 10mm × 10mm. The exposed pad is internally connected to AGND and must be soldered to a large PCB ground plane for thermal and electrical performance. Pin functions-including CH0–CH3, DB0–DB15, CONVST, EOC, RD/WR/CS, and RDC-are explicitly defined in the "Pin Description" section of the MAX11044 datasheet for the TQFP variant.
How does the MAX11044ECB+T handle overvoltage conditions on analog inputs?
The MAX11044ECB+T includes internal ±20mA input clamps on each analog input (CH0–CH3), protecting against overvoltage events up to ±7.5V relative to AGND. To ensure safe operation, an external current-limiting resistor must be placed in series with each input. For example, a 250Ω resistor limits fault current to 20mA at ±5V overvoltage. This architecture eliminates the need for external TVS diodes in many industrial applications while maintaining specified accuracy during normal operation.
Can the MAX11044ECB+T operate with a 3.3V digital supply?
Yes, the MAX11044ECB+T supports DVDD from 2.7V to 5.25V, including standard 3.3V logic levels. At DVDD = 3.3V, the digital supply current is 5.5mA (typical), and interface timing parameters-including t6 (input setup), t7 (input hold), t12 (data valid), and t13 (data hold)-remain fully compliant. All digital inputs (RD, WR, CS, CONVST) accept VIH ≥ 2.0V and VIL ≤ 0.8V, ensuring reliable operation with 3.3V microcontrollers without level translation.
MAX11044ECB+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 64-TQFP Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- 4
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 4
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 64-TQFP-EP (10x10)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX11044ECB+T FAQ
1.How can I place an order for MAX11044ECB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX11044ECB+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 MAX11044ECB+T reliable?
The price and inventory of MAX11044ECB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX11044ECB+T is usually 5 days.
3.What payment methods are accepted for MAX11044ECB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX11044ECB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX11044ECB+T?
MAX11044ECB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX11044ECB+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 MAX11044ECB+T?
For technical support, including MAX11044ECB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX11044ECB+T requirements.
6.How does Aetrix verify that MAX11044ECB+T is sourced from the original manufacturer or authorized distributors?
All MAX11044ECB+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 MAX11044ECB+T meets industry standards.
7.What is the process for return or replacement of MAX11044ECB+T?
All MAX11044ECB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX11044ECB+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 MAX11044ECB+T part is unused and in its original packaging.
Return procedure for MAX11044ECB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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