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Analog Devices Inc./Maxim Integrated MAX1262BEEI+
- Part No.:
- MAX1262BEEI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1262BEEI+.pdf
- Description:
- IC ADC 12BIT 400KSPS 28-QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,228
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Product details
Overview
MAX1262BEEI+ from Maxim Integrated is a 12-bit successive-approximation analog-to-digital converter (SAR ADC) with integrated +2.5V reference, byte-wide parallel (8+4) interface, and software-configurable 8-channel single-ended or 4-channel pseudo-differential input multiplexer. It operates from a single +5V analog supply and supports digital logic levels from +2.7V to +5.5V via VLOGIC, enabling direct interfacing with mixed-voltage microprocessors in portable data-acquisition systems.
For engineers reviewing the MAX1262BEEI+ datasheet, MAX1262BEEI+ pinout, MAX1262BEEI+ application, or MAX1262BEEI+ equivalent, this page delivers verified specifications including ±1 LSB INL over –40°C to +85°C, 400ksps max sampling rate, 2.5mA active current at full speed, 2µs wake-up from shutdown, and QSOP-28 package compatibility - all critical for low-power, space-constrained industrial and medical sensor front-ends.
Technical Context
The MAX1262BEEI+ implements a charge-redistribution SAR architecture with an internal track-and-hold stage offering 6MHz full-power bandwidth and 350kHz full-linear bandwidth. Its conversion timing is configurable via control byte bits ACQMOD, PD1/PD0, and SGL/DIF, supporting both internal and external acquisition modes with precise aperture control.
It features dual power domains: VDD powers the analog core and internal reference, while VLOGIC independently supplies the tri-state parallel interface (D0–D11, INT, RD, WR), enabling interoperability with 2.7V–5.5V logic families. The HBEN pin enables high-byte/low-byte multiplexing of the 12-bit result across the 8-bit data bus, reducing I/O count without sacrificing resolution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 610 µV step size with 2.5V reference, sufficient for 0.024% full-scale precision in sensor signal chains. |
| INL (Integral Nonlinearity) | ±1 LSB over –40°C to +85°C - ensures monotonicity and <0.024% absolute linearity error in closed-loop control feedback paths. |
| Sampling Rate | 400ksps maximum - supports Nyquist sampling of signals up to 200kHz, suitable for vibration monitoring and ECG waveform capture. |
| Power Consumption | 2.5mA at 400ksps (VDD = VLOGIC = +5V) - enables battery operation >10 hours on a 200mAh coin cell in intermittent-sampling mode. |
| Reference | +2.5V internal bandgap reference (±2 ppm/°C TC, ±100mV adjust range) - eliminates external reference component cost and layout area. |
| Interface | Byte-wide parallel (8+4) with tri-state outputs and HBEN multiplexing - interfaces directly to 8-bit microcontrollers without glue logic or FIFO buffering. |
| Wake-up Time | 2µs from shutdown - allows rapid response to event-triggered sampling, minimizing latency in alarm-driven data logging. |
Pinout & Package
MAX1262BEEI+ is housed in a 28-pin QSOP (Quad Small Outline Package) with 0.15mm lead pitch and 9.9mm × 3.9mm footprint, optimized for high-density PCB layouts in portable instrumentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 HBEN | High-Byte Enable | Selects MSB nibble (D8–D11) or LSB byte (D0–D7) on shared data bus - reduces microcontroller I/O count by 4 pins. |
| 2–9 D7–D0/D11–D8 | Tri-State Parallel Data Bus | 8-bit bidirectional bus carrying either lower 8 bits or upper 4 bits + 4 status bits - enables compact 8-bit host interface. |
| 10 INT | Interrupt Output | Active-low open-drain flag signaling conversion completion - triggers microcontroller ISR without polling overhead. |
| 11 RD | Read Select Input | Falling-edge–triggered read strobe - synchronizes data capture with host clock, eliminating setup/hold timing constraints. |
| 12 WR | Write Select Input | Rising-edge–triggered control latch - initiates channel selection, unipolar/bipolar mode, and acquisition start in one pulse. |
| 13 CLK | Clock Input/Mode Select | Accepts external 100kHz–7.6MHz clock or configures internal clock when tied to VDD/GND - decouples timing from host processor. |
| 14 CS | Chip Select | Active-low enable disabling all digital outputs to high-impedance - permits bus sharing with multiple peripherals. |
| 15–22 CH7–CH0 | Analog Input Channels | Eight single-ended or four pseudo-differential inputs - supports multi-sensor monitoring (e.g., temperature, pressure, voltage) in one IC. |
| 23 COM | Analog Common Reference | Zero-code reference for single-ended mode and stable bias point for pseudo-differential pairs - must be decoupled within ±0.5 LSB noise floor. |
| 24 GND | Analog/Digital Ground | Common return for analog and digital sections - requires star grounding to prevent digital switching noise from corrupting ADC accuracy. |
| 25 REFADJ | Reference Adjust/Bypass | Connect to VDD to disable internal reference when using external source; bypass with 0.01µF capacitor for stability. |
| 26 REF | Reference Output/Input | Provides +2.5V internal reference or accepts external reference; requires 4.7µF capacitor to GND for low-noise operation. |
| 27 VDD | +5V Analog Supply | Powers analog core, T/H, and internal reference - must be decoupled with 0.1µF ceramic capacitor close to pin. |
| 28 VLOGIC | +2.7V to +5.5V Digital Supply | Independently powers digital I/O - enables direct connection to 3.3V or 5V microcontrollers without level shifters. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Single-ended (8 ch) or pseudo-differential (4 ch) mode selected via control byte - adapts to sensor output type (ground-referenced vs. floating) without hardware change. |
| Unipolar/bipolar input range selection | Configurable via control bit: 0 to +2.5V (unipolar) or –1.25V to +1.25V (bipolar) - supports both DC-coupled and AC-coupled transducer signals. |
| Dual power-down modes | Standby (<10µA) and full shutdown (2µA) - extends battery life in wireless sensor nodes by >100× between measurements. |
| Internal 6MHz track-and-hold | Eliminates need for external sample-hold circuit - preserves signal integrity for fast transients (e.g., motor current spikes) without added components. |
| On-chip +2.5V reference with ±2 ppm/°C TC | Stable reference over industrial temperature range - removes drift-induced calibration burden in field-deployed equipment. |
| VLOGIC voltage flexibility | +2.7V to +5.5V digital supply range - allows seamless integration with legacy 5V and modern 3.3V microcontrollers without level translation. |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous logging of temperature, pressure, and flow sensor outputs in PLC-based factory automation cabinets. IC Role / Device Role / Timing Role: Front-end ADC digitizing 8 analog sensor channels with synchronized sampling and interrupt-driven data transfer to ARM Cortex-M4 MCU. Use Value: Single-chip 8-channel capability reduces BOM count and board area vs. discrete ADC solutions; ±1 LSB INL ensures repeatability across thermal cycles in uncalibrated environments. |
Use Scenario: Portable ECG monitor capturing lead-II differential signals with simultaneous respiration and SpO₂ analog inputs. IC Role / Device Role / Timing Role: Low-power SAR ADC performing 400ksps pseudo-differential sampling on CH0/CH1 pair, with VLOGIC powered from 3.3V LDO for MCU compatibility. Use Value: 2µs wake-up and 2µA shutdown current enable battery life >72 hours; internal reference eliminates drift-related baseline wander in clinical-grade waveforms. |
| Energy Metering Subsystem | Touch-Screen Controller Interface |
Use Scenario: Residential smart meter measuring voltage/current harmonics via shunt and CT sensors under IEC 62053-21 compliance. IC Role / Device Role / Timing Role: High-accuracy ADC converting isolated analog outputs from metrology AFE, operating in bipolar mode for AC waveform digitization. Use Value: ±1 LSB INL and 70dB SINAD meet Class 0.5 accuracy requirements; 350kHz full-linear bandwidth supports harmonic analysis up to 50th order. |
Use Scenario: Resistive touch overlay digitizer in handheld HMI panel, reading X/Y coordinate voltages from 4-wire analog interface. IC Role / Device Role / Timing Role: 8-channel single-ended ADC scanning CH0–CH3 for X+, X−, Y+, Y− voltages with automatic channel sequencing via control byte address bits. Use Value: Software-selectable unipolar mode (0–2.5V) matches touch controller output range; 400ksps rate enables <5ms full-screen scan for responsive user interaction. |
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, lower-speed applications like basic potentiometer reading | Select only if resolution and sampling rate requirements are relaxed and serial interface is preferred. |
| MAX1162BCAP+ | 12-bit, 250ksps, internal reference, SPI interface, 20-pin TSSOP | Lower sampling rate and serial interface require firmware changes; lacks HBEN multiplexing | Choose when board space is tighter (TSSOP vs QSOP) and SPI is already used in system architecture. |
Compared with MAX1262BEEI+, ADS7822U trades resolution and speed for smaller size and lower cost in non-critical sensing, while MAX1162BCAP+ retains 12-bit accuracy but sacrifices 40% sampling throughput and parallel simplicity for SPI compatibility and reduced pin count.
Availability
MAX1262BEEI+ is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital sign acquisition, energy metering subsystems, and touch-screen controller interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1262BEEI+ 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 MAX1262BEEI+ belongs to Maxim's precision data-acquisition ADC family, designed specifically for low-power, multi-channel sensor interfacing in space- and energy-constrained embedded systems operating across –40°C to +85°C.
FAQ
What is the guaranteed INL specification for MAX1262BEEI+ over its full operating temperature range?
The MAX1262BEEI+ guarantees ±1 LSB integral nonlinearity (INL) over its specified industrial temperature range of –40°C to +85°C, as confirmed in the Ordering Information table and Electrical Characteristics section of the official datasheet. This performance level ensures monotonic behavior and predictable code transitions across thermal extremes without recalibration, making MAX1262BEEI+ suitable for closed-loop control and metrology applications where absolute accuracy is required.
Does MAX1262BEEI+ support both unipolar and bipolar input configurations, and how is this controlled?
Yes, MAX1262BEEI+ supports both unipolar (0V to +2.5V) and bipolar (–1.25V to +1.25V) input ranges. This is configured via the UNI/BIP bit (D3) in the 8-bit control byte written during each conversion setup. When UNI/BIP = 1, the device operates in unipolar mode; when UNI/BIP = 0, it switches to bipolar mode. The MAX1262BEEI+ automatically adjusts its internal reference scaling and offset accordingly, allowing flexible sensor interfacing without external signal conditioning.
How does the HBEN pin function in MAX1262BEEI+, and why is it important for 8-bit microcontrollers?
The HBEN (High Byte Enable) pin on MAX1262BEEI+ controls multiplexing of the 12-bit conversion result onto the 8-bit data bus: when HBEN = 1, D0–D7 carry D8–D11 (upper nibble); when HBEN = 0, D0–D7 carry D0–D7 (lower byte). This allows full 12-bit resolution to be read using only an 8-bit data bus, eliminating the need for wider microcontroller ports or external latches. For 8-bit MCUs like the ATmega328P or PIC18F series, HBEN simplifies hardware design and firmware development while preserving measurement fidelity.
What are the power-down current specifications for MAX1262BEEI+, and how are the modes selected?
MAX1262BEEI+ offers two software-selectable power-down modes: standby mode draws <10µA, and full shutdown draws 2µA (typical) at VDD = +5V. These are selected via PD1/PD0 bits (D7, D6) in the control byte. Standby mode retains register state and reference bias, enabling 2µs wake-up; full shutdown disables the internal reference and T/H, requiring longer stabilization on wake-up. Both modes are entered between conversions and exited automatically upon parallel interface access, making MAX1262BEEI+ ideal for battery-powered duty-cycled systems.
Can MAX1262BEEI+ operate with different analog and digital supply voltages, and what are the valid ranges?
Yes, MAX1262BEEI+ supports independent analog and digital supplies: VDD must be +5V ±10% (4.5V to 5.5V) for the analog core and internal reference, while VLOGIC can range from +2.7V to +5.5V (or up to VDD + 300mV) to power the parallel interface. This separation allows MAX1262BEEI+ to interface directly with 3.3V microcontrollers while maintaining full analog performance, eliminating level-shifters and reducing system complexity and cost in mixed-voltage designs.
MAX1262BEEI+ 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:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 400k
- 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:
- 5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1262BEEI+ FAQ
1.How can I place an order for MAX1262BEEI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1262BEEI+ 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 MAX1262BEEI+ reliable?
The price and inventory of MAX1262BEEI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1262BEEI+ is usually 5 days.
3.What payment methods are accepted for MAX1262BEEI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1262BEEI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1262BEEI+?
MAX1262BEEI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1262BEEI+ 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 MAX1262BEEI+?
For technical support, including MAX1262BEEI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1262BEEI+ requirements.
6.How does Aetrix verify that MAX1262BEEI+ is sourced from the original manufacturer or authorized distributors?
All MAX1262BEEI+ 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 MAX1262BEEI+ meets industry standards.
7.What is the process for return or replacement of MAX1262BEEI+?
All MAX1262BEEI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1262BEEI+, 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 MAX1262BEEI+ part is unused and in its original packaging.
Return procedure for MAX1262BEEI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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