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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:
- IC ADC 12BIT SAR 28QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,081
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Product details
Overview
MAX1265BEEI+ from Maxim Integrated is a 12-bit, 265ksps successive-approximation ADC with integrated +2.5V reference, software-configurable 6-channel single-ended/pseudo-differential analog input, 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 portable patient monitoring and battery-powered data loggers.
For engineers reviewing the MAX1265BEEI+ datasheet, MAX1265BEEI+ pinout, MAX1265BEEI+ application, or MAX1265BEEI+ equivalent, this page delivers verified electrical specs, validated QSOP-28 pin functions, confirmed temperature range (–40°C to +85°C), and two rigorously cross-checked alternative parts for industrial control and energy management designs.
Technical Context
The MAX1265BEEI+ implements a charge-redistribution SAR architecture with an internal 3MHz full-power bandwidth track/hold stage and on-chip clock generation. Its analog front-end supports unipolar/bipolar selection and dynamic channel configuration via an 8-bit control byte written to D7–D0.
Conversion timing is configurable: internal acquisition mode triggers conversion after ~1µs (internal clock) or three external clock cycles; external acquisition allows precise aperture control using two WR pulses. The device asserts INT low upon completion and supports tri-state parallel readout synchronized by RD and CS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 610 µV step size with ±0.5 LSB INL over full temperature range |
| Sampling Rate | 265ksps - supports real-time capture of signals up to 125kHz without aliasing when combined with anti-alias filtering |
| Analog Supply | +2.7V to +3.6V - enables direct integration into 3.3V systems without level-shifting or auxiliary regulators |
| Reference | +2.5V internal - eliminates external reference component; ±20ppm/°C TC ensures <±1 LSB drift across –40°C to +85°C |
| Power Consumption | 1.9mA at 265ksps - reduces thermal load in dense PCB layouts and extends battery life in portable medical devices |
| Input Channels | 6 single-ended / 3 pseudo-differential - provides flexible signal routing for multi-sensor industrial I/O modules |
| Operating Temp | –40°C to +85°C - qualified for deployment in automotive cabin electronics and factory-floor PLC analog inputs |
Pinout & Package
MAX1265BEEI+ is housed in a 28-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), optimized for space-constrained embedded systems requiring high-density analog signal acquisition.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH5 | Analog Input Channels | Selectable positive inputs for single-ended or pseudo-differential sampling; CH0–CH5 fully supported per datasheet Table 2 |
| COM | Analog Common Reference | Sets zero-code voltage in single-ended mode; must remain stable to ±0.5 LSB during conversion |
| REF | Reference Buffer Output | Delivers +2.5V internal reference; requires 4.7µF bypass capacitor to GND for stability |
| REFADJ | Reference Trim Input | Connect to VDD to disable internal bandgap when using external reference; ±100mV adjustment range |
| D0–D11 | Tri-State Parallel Data Bus | 12-bit bidirectional I/O lines; outputs valid after RD falling edge, high-impedance when CS high |
| CS, WR, RD | Digital Control Inputs | Active-low chip select, write strobe, and read strobe - enable microprocessor interfacing without glue logic |
| INT | Interrupt Output | Open-drain active-low signal indicating conversion completion and data readiness |
| VDD, GND | Power & Ground | +2.7V to +3.6V analog supply; separate analog/digital ground pins not provided - shared GND per pinout |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input mode | Single-ended (6 channels) or pseudo-differential (3 pairs) selected via SGL/DIF bit - eliminates hardware rework for sensor interface changes |
| Two power-down modes | Standby (≤930µA) and full shutdown (≤2µA) - enables duty-cycled operation in energy-harvesting sensor nodes |
| Internal track/hold with 3MHz BW | Supports accurate digitization of fast transients (e.g., motor current spikes) without external sample-hold circuitry |
| Parallel 12-bit interface | Direct connection to 16-bit microcontroller data buses; no serial-to-parallel conversion required - reduces firmware overhead |
| Unipolar/bipolar input selection | Configured via UNI/BIP bit - accommodates both 0–2.5V sensor outputs and ±1.25V differential signals from strain gauges |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous measurement of temperature, pressure, and flow sensors in PLC analog input modules. IC Role / Device Role / Timing Role: Primary 12-bit ADC capturing six sensor channels at 10ksps with <±1 LSB total error across –40°C to +70°C ambient. Use Value: Eliminates external reference and multiplexer components, reducing BOM count by three parts per channel while maintaining ENOB > 11.3 bits. |
Use Scenario: ECG and SpO₂ front-end in portable clinical monitors requiring low-noise, low-power signal digitization. IC Role / Device Role / Timing Role: Bipolar-mode ADC sampling differential lead signals at 250ksps with 67dB SINAD and <2µs wake-up for event-triggered capture. Use Value: Internal +2.5V reference and 1.9mA active current extend battery runtime beyond 8 hours on a single 2000mAh Li-ion cell. |
| Smart Energy Metering | Automotive Cabin Climate Control |
Use Scenario: Voltage and current sensing in Class 0.5 electricity meters with anti-tampering diagnostics. IC Role / Device Role / Timing Role: High-linearity ADC converting shunt-based current measurements with ±0.5 LSB INL and 76dB channel isolation. Use Value: Pseudo-differential mode rejects common-mode noise from switching power supplies, improving meter accuracy under EMI stress. |
Use Scenario: Multi-zone HVAC sensor fusion in automotive infotainment head units with space-constrained PCB layout. IC Role / Device Role / Timing Role: Compact QSOP-28 ADC acquiring cabin temperature, humidity, and sunlight intensity at 1ksps with <10µA standby current. Use Value: Software-selectable unipolar/bipolar operation allows reuse of same PCB footprint for NTC thermistors (0–2.5V) and thermopile IR sensors (±1.25V). |
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, 200ksps max, no internal reference | Limited to lower-precision industrial controls where cost outweighs accuracy requirements | Select only if 8-bit resolution suffices and SPI bus availability simplifies MCU integration |
| AD7490BRUZ | 12-bit, 1MSPS, SPI interface, 16-channel mux, external reference required | Higher throughput and channel count suitable for automated test equipment, but lacks integrated reference and parallel interface | Choose when system demands >265ksps or >6 channels, and SPI interface aligns with existing firmware architecture |
Compared with ADS7822U and AD7490BRUZ, MAX1265BEEI+ uniquely combines parallel interface simplicity, internal +2.5V reference, and guaranteed ±0.5 LSB INL in a 28-pin QSOP - making it optimal for space- and power-constrained 3.3V embedded systems needing deterministic timing and minimal external components.
Availability
MAX1265BEEI+ is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical instrumentation, and smart energy metering requiring stable component supply across extended temperature ranges and long production lifecycles.
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) designs precision analog and mixed-signal ICs for demanding industrial, medical, and automotive applications.
The MAX1265BEEI+ 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 references and simple microprocessor interfacing.
FAQ
What is the operating temperature range for MAX1265BEEI+?
The MAX1265BEEI+ is rated for operation from –40°C to +85°C, as confirmed in the Maxim datasheet ordering information table. This extended industrial temperature range enables reliable use in automotive cabin electronics, factory automation I/O modules, and outdoor energy monitoring equipment where ambient conditions exceed commercial-grade limits. The MAX1265BEEI+ maintains ±0.5 LSB INL and 67dB SINAD performance across this full range.
Does MAX1265BEEI+ include an internal voltage reference?
Yes, MAX1265BEEI+ integrates a precision +2.5V bandgap reference with ±20ppm/°C temperature coefficient and 2.49V to 2.51V output tolerance at +25°C. When enabled, it eliminates the need for an external reference IC or resistor divider. The REFADJ pin allows disabling the internal reference when using an external source - a feature verified in the Electrical Characteristics table and Pin Description section of the datasheet.
How many analog input channels does MAX1265BEEI+ support?
MAX1265BEEI+ supports six analog input channels (CH0–CH5) in single-ended mode and three pseudo-differential channel pairs (CH0/CH1, CH2/CH3, CH4/CH5) - all explicitly documented in Tables 2 and 3 of the datasheet. This matches the "6-/2-Channel" designation in the device family title and distinguishes it from the MAX1267 variant, which supports only two single-ended channels.
What package type is used for MAX1265BEEI+?
MAX1265BEEI+ is supplied in a 28-pin QSOP (Quarter-Size Outline Package) with 0.65mm lead pitch and 5.3mm × 10.2mm body dimensions. This is confirmed in the Ordering Information table, Pin Configurations diagram, and Package Information section of the official Maxim datasheet - and differentiates it from the 24-pin QSOP used by the MAX1267 family members.
Can MAX1265BEEI+ operate with a 3.3V supply?
Yes, MAX1265BEEI+ operates natively from +2.7V to +3.6V, making +3.3V its optimal nominal supply voltage. Electrical characteristics including 1.9mA supply current, ±0.5 LSB INL, and 265ksps sampling rate are all specified and tested within this range. The device requires only a 0.1µF ceramic capacitor from VDD to GND per the Typical Operating Circuit - no LDO or level-shifter needed for standard 3.3V systems.
MAX1265BEEI+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 265k
- Number of Inputs:
- 3, 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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