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Analog Devices Inc./Maxim Integrated MAX1261AEEI+T
- Part No.:
- MAX1261AEEI+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1261AEEI+T.pdf
- Description:
- IC ADC 12BIT SAR 28QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,336
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Product details
Overview
MAX1261AEEI+T from Maxim Integrated is a 12-bit, 250ksps successive-approximation ADC with integrated +2.5V reference, 8-channel single-ended/4-channel pseudo-differential analog input multiplexer, and byte-wide parallel (8+4) interface. It operates from a single +3V analog supply and supports digital logic levels from +1.8V to +3.6V via dedicated VLOGIC pin. Designed for battery-powered data acquisition in industrial control and patient monitoring systems.
For engineers reviewing the MAX1261AEEI+T datasheet, MAX1261AEEI+T pinout, MAX1261AEEI+T application, or MAX1261AEEI+T equivalent, key selection criteria include its -40°C to +85°C extended temperature range, ±0.5 LSB INL, internal track/hold with 3MHz full-power bandwidth, and software-configurable unipolar/bipolar input modes.
Technical Context
The MAX1261AEEI+T implements a charge-redistribution SAR architecture with an on-chip track/hold stage, supporting both internal and external clock modes (up to 4.8MHz). Its analog front-end allows dynamic reconfiguration between single-ended and pseudo-differential operation via control-byte bits SGL/DIF and UNI/BIP.
Conversion timing is determined by acquisition mode (internal or external), with internal acquisition completing in ~1µs and external acquisition enabling precise aperture control. The device uses a 12-bit capacitive DAC and supports two power-down modes-standby (10µA) and full shutdown (2µA)-activated via PD0/PD1 bits in the control byte.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = VREF/4096 quantization step for high-fidelity signal digitization |
| Sampling Rate | 250ksps - enables real-time capture of signals up to 125kHz Nyquist frequency |
| INL | ±0.5 LSB - ensures monotonicity and <0.012% full-scale linearity error across temperature |
| Reference | +2.5V internal - eliminates need for external reference IC; TCREF = ±2ppm/°C |
| Supply Current | 1.9mA at 250ksps - enables low-power operation with 5.7mW total dissipation at VDD = VLOGIC = +3V |
| Input Channels | 8 single-ended / 4 pseudo-differential - supports multi-sensor monitoring without external MUX |
| Operating Temp | -40°C to +85°C - qualified for industrial and medical environments per AEEI grade |
Pinout & Package
MAX1261AEEI+T is housed in a 28-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), optimized for space-constrained PCB layouts while maintaining thermal performance up to +85°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VLOGIC | Digital supply input | Decouples logic-level interface from analog supply; supports +1.8V to +3.6V for mixed-voltage system interfacing |
| REF | Reference buffer output | Provides stable +2.5V reference; requires 4.7µF bypass capacitor to GND for internal reference use |
| CH0–CH7 | Analog input channels | Eight single-ended inputs; configurable as four pseudo-differential pairs (e.g., CH0/CH1) |
| COM | Common-mode reference | Sets zero-code voltage in single-ended mode; must remain stable within ±0.5 LSB during conversion |
| CS | Chip select | Active-low enable; places D0–D7 outputs in high-impedance state when high |
| WR/RD | Write/read strobes | Control byte latching (WR) and data readback (RD); support interrupt-driven or polling-based µP interface |
| HBEN | High-byte enable | Selects 8-bit LSB (HBEN = 0) or 4-bit MSB (HBEN = 1) transfer on D0–D3 bus |
| INT | Conversion complete flag | Active-low open-drain output signals valid data ready; resets on first RD cycle |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Single-ended or pseudo-differential mode selected via SGL/DIF bit; avoids hardware redesign for sensor interface changes |
| Dynamic power scaling | Current drops from 1.9mA (250ksps) to 400µA (10ksps) or 2µA (shutdown), enabling adaptive energy management |
| Internal track/hold | 3MHz full-power bandwidth supports undersampling of transients and anti-aliasing filter simplification |
| Flexible clocking | Internal 3MHz clock or external 100kHz–4.8MHz source; ACQMOD bit enables precise aperture control in external acquisition mode |
| Robust analog input protection | Clamp diodes allow safe overvoltage tolerance to (GND − 300mV) and (VDD + 300mV) without damage |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous logging of temperature, pressure, and flow sensor outputs in PLC-based control cabinets. IC Role / Device Role / Timing Role: Central 12-bit ADC digitizing eight analog sensor channels with synchronized sampling and low-latency parallel readout. Use Value: Eliminates external reference and level-shifting components; ±0.5 LSB INL ensures calibration stability across -40°C to +85°C operating range. |
Use Scenario: Portable ECG and SpO₂ monitor acquiring biopotential signals with low noise and high common-mode rejection. IC Role / Device Role / Timing Role: Pseudo-differential ADC capturing differential lead signals (e.g., CH0/CH1) while rejecting 50/60Hz mains interference. Use Value: Internal +2.5V reference and COM-referenced architecture reduce offset drift; 250ksps rate supports >100Hz bandwidth for diagnostic-grade waveforms. |
| Energy Metering Subsystem | Smart Sensor Node Interface |
Use Scenario: Multi-phase electricity meter measuring voltage/current waveforms for RMS, harmonic, and power factor calculation. IC Role / Device Role / Timing Role: High-speed ADC with bipolar input mode digitizing ±1.25V AC waveforms referenced to VREF/2. Use Value: Bipolar configuration enables direct AC coupling; 67dB SINAD at 50kHz ensures accurate spectral analysis for Class 0.5 metering compliance. |
Use Scenario: Wireless condition-monitoring node collecting vibration, temperature, and humidity data from MEMS and analog sensors. IC Role / Device Role / Timing Role: Low-power ADC entering standby mode (10µA) between 100ms sampling intervals to extend coin-cell battery life. Use Value: Dual power-down modes and VLOGIC flexibility allow seamless integration with 1.8V microcontrollers and RF SoCs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-bit resolution, SPI interface, no internal reference, 200ksps max rate | Limited to lower-precision sensor readout; lacks parallel interface and on-chip reference | Choose only if 8-bit resolution suffices and SPI is preferred over parallel bus |
| AD7490BRUZ | 12-bit, 1MSPS, SPI interface, internal reference, 16-channel mux, +2.7V to +5.25V supply | Higher speed and channel count but serial interface increases µP overhead; wider supply range adds complexity in +3V-only systems | Prefer when higher throughput or more inputs are needed and SPI infrastructure exists |
Compared with ADS7822U and AD7490BRUZ, the MAX1261AEEI+T uniquely combines byte-wide parallel interface, integrated +2.5V reference, and 8-channel single-ended capability in a -40°C to +85°C qualified QSOP package-making it optimal for space- and power-constrained industrial DAQ where µP I/O bandwidth and BOM simplicity are critical.
Availability
MAX1261AEEI+T is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical devices, energy metering subsystems, and smart sensor nodes requiring stable component supply across extended temperature ranges.
Supply support for MAX1261AEEI+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 demanding industrial, medical, and communications applications.
The MAX1261AEEI+T belongs to Maxim's low-power, high-accuracy SAR ADC product line, engineered specifically for battery-operated and space-constrained data acquisition systems requiring integrated reference and flexible digital interfacing.
FAQ
What is the operating temperature range of the MAX1261AEEI+T?
The MAX1261AEEI+T is rated for -40°C to +85°C operation, meeting the extended industrial temperature grade (denoted by "E" in the part number suffix). This qualification ensures reliable performance in harsh environments such as factory automation cabinets, outdoor energy meters, and portable medical equipment without derating.
Does the MAX1261AEEI+T require an external reference voltage?
No, the MAX1261AEEI+T includes a precision +2.5V internal bandgap reference with ±2ppm/°C temperature coefficient. When using the internal reference, connect a 4.7µF capacitor from REF to GND. An external reference can be applied to the REF pin only if REFADJ is tied to VDD to disable the internal reference.
How many analog input channels does the MAX1261AEEI+T support?
The MAX1261AEEI+T supports eight single-ended analog inputs (CH0–CH7) or four pseudo-differential input pairs (e.g., CH0/CH1, CH2/CH3). This is fixed per the MAX1261 family; the MAX1263 variant offers four single-ended inputs and is not interchangeable with the MAX1261AEEI+T.
What digital interface does the MAX1261AEEI+T use?
The MAX1261AEEI+T features a byte-wide parallel (8+4) tri-state interface with CS, WR, RD, HBEN, and INT control signals. Data is multiplexed across D0–D7 (LSBs) and D0/D8–D3/D11 (MSBs), enabling direct connection to 8-bit microprocessors without glue logic or serialization overhead.
Can the MAX1261AEEI+T operate with a 1.8V digital supply?
Yes, the MAX1261AEEI+T supports digital logic levels from +1.8V to +3.6V via the dedicated VLOGIC pin. This allows direct interfacing with low-voltage microcontrollers (e.g., ARM Cortex-M0+) while maintaining full analog performance from the +3V VDD supply-eliminating level shifters in mixed-voltage designs.
MAX1261AEEI+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- 4, 8
- Input Type:
- Pseudo-Differential, Single Ended
- Data Interface:
- Parallel
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 1.8V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1261AEEI+T FAQ
1.How can I place an order for MAX1261AEEI+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1261AEEI+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 MAX1261AEEI+T reliable?
The price and inventory of MAX1261AEEI+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1261AEEI+T is usually 5 days.
3.What payment methods are accepted for MAX1261AEEI+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1261AEEI+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1261AEEI+T?
MAX1261AEEI+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1261AEEI+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 MAX1261AEEI+T?
For technical support, including MAX1261AEEI+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1261AEEI+T requirements.
6.How does Aetrix verify that MAX1261AEEI+T is sourced from the original manufacturer or authorized distributors?
All MAX1261AEEI+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 MAX1261AEEI+T meets industry standards.
7.What is the process for return or replacement of MAX1261AEEI+T?
All MAX1261AEEI+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1261AEEI+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 MAX1261AEEI+T part is unused and in its original packaging.
Return procedure for MAX1261AEEI+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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