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Analog Devices Inc./Maxim Integrated MAX1265BEEI
- Part No.:
- MAX1265BEEI
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1265BEEI.pdf
- Description:
- 6-CHANNEL, 12-BIT ADC
- Quantity:
- Payment:
- Shipping:
Inventory:105
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Product details
Overview
MAX1265BEEI from Maxim Integrated is a 12-bit, 265ksps successive-approximation ADC with internal +2.5V reference, software-configurable 6-channel single-ended or 3-channel pseudo-differential analog inputs, and parallel 12-bit interface. It operates from a single +2.7V to +3.6V supply, consumes only 1.9mA at full speed, and features fast 2µs wake-up from shutdown - ideal for battery-powered patient monitoring and portable data-acquisition systems.
For engineers reviewing the MAX1265BEEI datasheet, MAX1265BEEI pinout, MAX1265BEEI application, or MAX1265BEEI equivalent, this page delivers verified electrical specs, thermal range (-40°C to +85°C), QSOP-28 package mapping, and real-world design context for low-power, space-constrained embedded signal conditioning.
Technical Context
The MAX1265BEEI implements a SAR architecture with integrated track/hold (3MHz full-power bandwidth) and on-chip clock generation. Its analog input multiplexer supports unipolar/bipolar and single-ended/pseudo-differential modes via software-controlled configuration bits (SGL/DIF, UNI/BIP, A2–A0).
Conversion timing is configurable: internal acquisition (3-clock-cycle hold, ~1µs) or external acquisition (user-defined aperture), with conversion completed in exactly 13 clock cycles. Power-down modes reduce current to <2µA, and the internal reference exhibits ±20ppm/°C drift and ±100mV REFADJ adjust range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 610µV step size with 2.5V reference for precise sensor digitization |
| Sampling Rate | 265ksps - supports Nyquist-limited bandwidth up to 132.5kHz or undersampling of higher-frequency transients |
| INL / DNL | ±0.5 LSB / ±1 LSB - ensures monotonicity and <0.012% integral error across full temperature range (-40°C to +85°C) |
| Supply Current | 1.9mA at 265ksps - enables >500hr runtime on a 1000mAh Li-ion cell in continuous acquisition mode |
| Reference | +2.5V internal - eliminates external reference component count; stable to ±0.5 LSB over temperature and supply variation |
| Input Channels | 6 single-ended or 3 pseudo-differential - supports multi-sensor front-ends without external MUX hardware |
| Package | 28-pin QSOP - 9.9mm × 3.9mm footprint compatible with standard surface-mount assembly and IPC-7351B land patterns |
Pinout & Package
MAX1265BEEI is housed in a 28-pin QSOP (Quad Small Outline Package) with 0.65mm lead pitch, rated for -40°C to +85°C industrial operation. Pin 1 is marked by a dot or beveled corner; pins are numbered counter-clockwise from pin 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH5 | Analog Input Channels | Selectable as IN+ in single-ended mode or paired as IN+/IN− in pseudo-differential mode (e.g., CH0/CH1); COM referenced |
| COM | Analog Ground Reference | Sets zero-code voltage in single-ended mode; must remain stable to ±0.5 LSB during conversion |
| REF / REFADJ | Reference Buffer I/O | REF outputs +2.5V internal reference; REFADJ adjusts reference or disables internal ref when tied to VDD |
| VDD / GND | Analog Power Supply | +2.7V to +3.6V single supply; requires 0.1µF bypass capacitor at VDD pin for noise immunity |
| CS / WR / RD | Digital Control Inputs | Active-low chip select, write strobe, and read strobe - enable µP-compatible parallel bus timing with no external glue logic |
| D0–D11 / INT | Data Bus & Status Output | 12-bit tri-state parallel output; INT asserts low upon conversion completion and remains low until first RD or new control byte write |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Single-ended (6 ch) or pseudo-differential (3 ch) selection via SGL/DIF bit - eliminates need for external analog switches or gain stages |
| Two power-down modes | Standby (<10µA) and full shutdown (<2µA) - enables microcontroller-governed duty cycling for ultra-low average power |
| Internal track/hold with 3MHz BW | Supports accurate sampling of signals up to 3MHz without external TH circuitry - critical for transient capture in energy monitoring |
| Unipolar/bipolar mode switching | Configured via UNI/BIP bit - allows same hardware to handle 0–2.5V sensor outputs or ±1.25V differential signals like bridge amplifiers |
| Fast 2µs wake-up time | Enables burst-mode acquisition with minimal latency - essential for responsive touch-screen controllers and event-triggered logging |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous measurement of temperature, pressure, and flow sensors in PLC-based factory automation cabinets. IC Role / Device Role / Timing Role: Primary ADC digitizing 6 analog sensor channels with simultaneous sampling capability via COM-referenced architecture. Use Value: Single-chip solution reduces BOM count and PCB area vs. discrete MUX + ADC designs; 1.9mA active current extends system uptime during brownout conditions. |
Use Scenario: Portable ECG and SpO₂ monitor acquiring biopotential signals with high common-mode rejection. IC Role / Device Role / Timing Role: Configured in pseudo-differential mode (CH0/CH1) to reject 50/60Hz mains interference while preserving signal integrity. Use Value: ±0.5 LSB INL ensures clinical-grade accuracy; internal reference eliminates calibration drift from external component aging. |
| Smart Energy Metering | Touch-Screen Controller Interface |
Use Scenario: Digitizing current transformer and voltage divider outputs in Class 0.5 electricity meters. IC Role / Device Role / Timing Role: High-speed 265ksps sampling captures harmonic content up to 132kHz for IEEE 519-compliant power quality analysis. Use Value: 3MHz full-power bandwidth enables undersampling of 50kHz harmonics; low 1.9mA consumption meets IEC 62053-21 standby power limits. |
Use Scenario: Resistive touch overlay scanning in handheld HMI devices with limited battery capacity. IC Role / Device Role / Timing Role: Rapid channel switching between X/Y electrode pairs using A2–A0 address bits and internal acquisition mode. Use Value: 2µs wake-up and 3.3µs conversion time allow sub-10ms full-panel scan; 28-QSOP fits tight bezel constraints. |
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 - requires external REF and level-shifting for +3V operation | Lower precision; suited for cost-sensitive, non-critical sensing where 256-level quantization suffices | Choose only if resolution ≤8-bit and serial interface are acceptable trade-offs for lower unit cost |
| MAX11607ETE+ | 12-bit, I²C interface, 10ksps max rate, internal reference - lacks parallel bus and multi-channel MUX flexibility | Targeted at low-speed, low-pin-count microcontrollers without parallel port; unsuitable for high-throughput burst acquisition | Select when I²C integration and ultra-low 350nA shutdown current outweigh need for speed and channel count |
Compared with ADS7822U and MAX11607ETE+, the MAX1265BEEI uniquely combines 12-bit precision, 265ksps parallel throughput, 6-channel software-selectable MUX, and integrated +2.5V reference in a single 28-QSOP package - making it optimal for space- and power-constrained embedded systems requiring deterministic timing and minimal external components.
Availability
MAX1265BEEI is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical diagnostics, smart energy metering, and human-machine interface design requiring stable component supply across extended temperature ranges.
Supply support for MAX1265BEEI 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.
The MAX1265BEEI belongs to Maxim's precision data-acquisition product line, engineered for low-power, high-accuracy digitization in battery-operated and thermally demanding environments - emphasizing ease of use, small footprint, and robust DC/dynamic performance.
FAQ
What is the operating temperature range for MAX1265BEEI?
The MAX1265BEEI is specified for industrial operation from -40°C to +85°C. This extended range is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the datasheet, where MAX1265BEEI is explicitly listed with "-40°C to +85°C" under TEMP RANGE. It is not rated for automotive or military temperature grades.
Does MAX1265BEEI include an internal voltage reference?
Yes, the MAX1265BEEI integrates a precision +2.5V bandgap reference with typical output of 2.500V, ±10mV initial accuracy, and ±20ppm/°C temperature coefficient. The REF pin delivers this voltage, and REFADJ allows fine adjustment or disabling of the internal reference when an external source is used.
How many analog input channels does MAX1265BEEI support?
The MAX1265BEEI supports six analog input channels (CH0–CH5) in single-ended mode or three pseudo-differential channel pairs (CH0/CH1, CH2/CH3, CH4/CH5). This is confirmed in the General Description, Features list, and Pin Configuration diagrams - distinguishing it from the 2-channel MAX1267 variant.
What package type is used for MAX1265BEEI?
The MAX1265BEEI uses a 28-pin QSOP (Quad Small Outline Package) with standard 0.65mm lead pitch and JEDEC MS-013AC dimensions (9.9mm × 3.9mm). This is unambiguously stated in the Ordering Information table and Pin Configurations section, where "28 QSOP" is listed alongside the MAX1265BEEI part number.
Can MAX1265BEEI operate from a +3.3V supply?
Yes, the MAX1265BEEI operates across a +2.7V to +3.6V analog supply range, fully covering +3.3V nominal systems. Electrical Characteristics tables confirm parameters (e.g., supply current, reference voltage, digital I/O thresholds) are guaranteed over this entire range, including at VDD = +3.3V.
MAX1265BEEI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 265k
- Number of Inputs:
- 6
- 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:
- 2.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1265BEEI FAQ
1.How can I place an order for MAX1265BEEI through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1265BEEI 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 MAX1265BEEI reliable?
The price and inventory of MAX1265BEEI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1265BEEI is usually 5 days.
3.What payment methods are accepted for MAX1265BEEI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1265BEEI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1265BEEI?
MAX1265BEEI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1265BEEI 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 MAX1265BEEI?
For technical support, including MAX1265BEEI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1265BEEI requirements.
6.How does Aetrix verify that MAX1265BEEI is sourced from the original manufacturer or authorized distributors?
All MAX1265BEEI 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 MAX1265BEEI meets industry standards.
7.What is the process for return or replacement of MAX1265BEEI?
All MAX1265BEEI units undergo pre-shipment inspection (PSI). If there is an issue with MAX1265BEEI, 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 MAX1265BEEI part is unused and in its original packaging.
Return procedure for MAX1265BEEI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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