My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX1261BEEI+
- Part No.:
- MAX1261BEEI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1261BEEI+.pdf
- Description:
- IC ADC 12BIT SAR 28QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,248
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX1261BEEI+ 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, it delivers ±0.5 LSB INL, 67dB SINAD, and 3MHz full-power bandwidth.
For engineers reviewing the MAX1261BEEI+ datasheet, MAX1261BEEI+ pinout, MAX1261BEEI+ application, or MAX1261BEEI+ equivalent, key selection criteria include its -40°C to +85°C industrial temperature range, software-configurable unipolar/bipolar input mode, 2µs wake-up from shutdown, and QSOP-28 package compatibility with space-constrained embedded sensor interfaces and portable instrumentation.
Technical Context
The MAX1261BEEI+ implements a charge-redistribution SAR architecture with integrated track/hold stage, supporting both internal and external clock modes (up to 4.8MHz). Its analog front-end enables flexible input configuration: single-ended (CH0–CH7) or pseudo-differential (CH0/CH1, CH2/CH3, CH4/CH5, CH6/CH7), with COM referenced zero-code point and ±0.5 LSB stability requirement during conversion.
Control is executed via an 8-bit software-configurable control byte that selects channel, acquisition mode (internal/external), clock source, unipolar/bipolar range, and single-ended/differential operation. The parallel interface uses tri-state D0–D7/D8–D11 lines with HBEN multiplexing, CS/WR/RD handshaking, and INT interrupt signaling - all compatible with standard microprocessor buses without glue logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-fidelity signal digitization in precision measurement systems. |
| Sampling Rate | 250ksps - supports real-time capture of signals up to 125kHz Nyquist frequency with adequate anti-alias margin. |
| INL / DNL | ±0.5 LSB / ±1 LSB - ensures monotonicity and <0.012% full-scale linearity error for calibrated transducer interfaces. |
| SINAD | 67dB at 50kHz - corresponds to ~11.1 effective bits, suitable for 16-bit system resolution when oversampled. |
| Power Consumption | 1.9mA at 250ksps (5.7mW @ 3V) - enables >100hr operation on a 200mAh Li-ion cell in intermittent-sampling mode. |
| Reference | +2.5V internal bandgap - eliminates external reference component count and provides ±2ppm/°C tempco over -40°C to +85°C. |
| Acquisition Bandwidth | 3MHz full-power - allows undersampling of transient events (e.g., motor fault spikes) without external op-amp buffering. |
Pinout & Package
MAX1261BEEI+ is housed in a 28-pin QSOP (Quad Small Outline Package) with 3.9mm body width and 0.635mm lead pitch, optimized for automated PCB assembly and thermal performance in compact industrial modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VLOGIC | Digital power supply rail | Decouples logic-level I/O from analog supply; accepts +1.8V to +3.6V to interface directly with low-voltage µPs or FPGAs. |
| VDD | Analog power supply | +2.7V to +3.6V analog rail; requires local 0.1µF bypass to GND for noise-sensitive SAR conversion integrity. |
| REF | Internal reference output / external reference input | Delivers stable +2.5V (±0.4%) when used with 4.7µF capacitor; accepts external reference if REFADJ tied to VDD. |
| COM | Analog common reference | Sets zero-code voltage in single-ended mode; must remain stable within ±0.5 LSB during conversion to avoid gain/offset errors. |
| CH0–CH7 | Analog input channels | Eight single-ended inputs or four pseudo-differential pairs; each protected by internal clamp diodes (GND−0.3V to VDD+0.3V). |
| CS | Active-low chip select | Enables parallel interface; places D0–D7/D8–D11 in high-impedance state when high to prevent bus contention. |
| WR / RD | Write and read strobes | Edge-triggered control: WR latches control byte or starts conversion; RD enables data readout with INT synchronization. |
| INT | Conversion complete interrupt | Active-low open-drain signal asserts when 12-bit result is valid; resets on first RD cycle or new control byte write. |
| HBEN | High-byte enable | Selects 8-bit LSB (HBEN=0) or 4-bit MSB (HBEN=1) on D0–D7 bus - enables efficient 12-bit transfers over 8-bit data paths. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Runtime selection of unipolar/bipolar range and single-ended/pseudo-differential mode via 8-bit control byte - eliminates hardware jumpers and simplifies firmware-driven sensor reconfiguration. |
| Two-stage power-down | Standby mode (10µA) and full shutdown (2µA) reduce quiescent current by >99% between conversions - critical for energy harvesting and battery longevity. |
| Integrated track/hold with 3MHz BW | Eliminates need for external op-amp buffer in most sensor applications; supports direct connection to resistive sensors (<3kΩ source impedance) without signal degradation. |
| Flexible clock architecture | Supports internal 3MHz clock (no external crystal required) or external clock (100kHz–4.8MHz) - balances µP resource usage vs. timing precision requirements. |
| Wide logic voltage range | VLOGIC pin accepts +1.8V to +3.6V - enables seamless interfacing with modern low-voltage microcontrollers (e.g., ARM Cortex-M0+) without level shifters. |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous monitoring of temperature, pressure, and flow sensors in PLC-based factory automation cabinets with limited board space and thermal headroom. IC Role / Device Role / Timing Role: Primary 12-bit digitizer for 8-channel analog sensor inputs; performs synchronized sampling under µP command with <2µs wake-up latency. Use Value: Single-chip integration of reference, multiplexer, and parallel interface reduces BOM count by 4 components versus discrete ADC + ref + mux solution. |
Use Scenario: Portable ECG and pulse oximetry units requiring low-noise, low-power analog front-end with clinical-grade accuracy and battery life >8 hours. IC Role / Device Role / Timing Role: High-fidelity signal digitizer operating in bipolar mode for differential biopotential measurements; leverages internal reference stability for drift-free baseline. Use Value: ±0.5 LSB INL and 67dB SINAD meet AAMI EC11 requirements for diagnostic-grade waveform fidelity without post-conversion calibration. |
| Energy Metering Subsystem | Touchscreen Controller Interface |
Use Scenario: Secondary ADC in smart meter designs capturing auxiliary parameters (voltage sag/swell, harmonic content) alongside primary metrology IC. IC Role / Device Role / Timing Role: Auxiliary 12-bit converter for non-revenue-critical measurements; samples at 250ksps with software-triggered burst mode for transient capture. Use Value: 3MHz full-power bandwidth enables accurate capture of 3rd–5th harmonic distortion during grid disturbances without external anti-alias filter. |
Use Scenario: Digitizing analog outputs from resistive touch overlay panels in industrial HMI displays where ESD robustness and fast response are essential. IC Role / Device Role / Timing Role: Low-latency ADC for X/Y coordinate calculation; uses pseudo-differential mode to reject common-mode noise from display backlight switching. Use Value: Internal 2.5V reference eliminates drift-induced coordinate offset; 2µs wake-up enables responsive touch detection with <10ms system latency. |
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-accuracy industrial controls; lacks parallel bus for high-throughput µP interfacing | Choose only if resolution and interface simplicity outweigh speed and accuracy needs. |
| AD7490BRUZ | 12-bit, 1MSPS, SPI interface, internal reference, 16-channel mux, -40°C to +125°C | Better speed and channel count but serial interface increases µP overhead; higher temp range suits automotive under-hood use | Prefer for high-channel-count systems with SPI-capable controllers; not drop-in for parallel-bus designs. |
Compared with MAX1261BEEI+, ADS7822U sacrifices 4 bits of resolution and parallel throughput for cost reduction, while AD7490BRUZ trades QSOP-28 pin compatibility and low-latency parallel access for higher speed and extended temperature capability - making MAX1261BEEI+ optimal for space-constrained, µP-centric industrial data loggers needing guaranteed 12-bit linearity and minimal external components.
Availability
MAX1261BEEI+ is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital sign acquisition, energy metering subsystems, and touchscreen controller interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1261BEEI+ 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 MAX1261BEEI+ belongs to Maxim's precision data acquisition product line, engineered for low-power, high-accuracy digitization in space- and energy-constrained embedded systems - particularly where integrated reference, flexible input configuration, and µP-friendly parallel interface are critical.
FAQ
What is the operating temperature range of the MAX1261BEEI+?
The MAX1261BEEI+ is rated for industrial operation from -40°C to +85°C, as confirmed by its "E" grade suffix and electrical specifications tested across this full range. This makes MAX1261BEEI+ suitable for deployment in harsh environments such as factory floors, outdoor metering enclosures, and portable medical devices exposed to ambient temperature variation.
Does the MAX1261BEEI+ require an external reference voltage?
No, the MAX1261BEEI+ includes a precision +2.5V internal bandgap reference with ±0.4% initial accuracy and ±2ppm/°C temperature coefficient, eliminating the need for an external reference in most applications. An external reference can be used by connecting REFADJ to VDD and driving the REF pin, but MAX1261BEEI+ is fully functional with internal reference enabled.
How many analog input channels does the MAX1261BEEI+ support?
The MAX1261BEEI+ supports eight single-ended analog inputs (CH0–CH7) or four pseudo-differential input pairs (CH0/CH1, CH2/CH3, CH4/CH5, CH6/CH7), as specified in the device's ordering information and pin description. This 8-/4-channel flexibility is fixed for MAX1261BEEI+ and distinguishes it from the 4-/2-channel MAX1263 variant.
What package type is used for the MAX1261BEEI+?
The MAX1261BEEI+ is supplied in a 28-pin QSOP (Quad Small Outline Package) with standard 0.635mm lead pitch and 3.9mm body width. This surface-mount package supports automated assembly and provides adequate thermal dissipation for its 5.7mW typical power consumption at full 250ksps operation.
Can the MAX1261BEEI+ interface directly with a +1.8V microcontroller?
Yes, the MAX1261BEEI+ features a dedicated VLOGIC pin that accepts +1.8V to +3.6V, allowing direct interfacing with +1.8V I/O domains without level-shifting circuitry. Digital outputs (D0–D7/D8–D11, INT) are referenced to VLOGIC, and input thresholds (VIH/VIL) scale accordingly - ensuring reliable communication with low-voltage µPs.
MAX1261BEEI+ 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:
- Obsolete
- 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:
- -
MAX1261BEEI+ FAQ
1.How can I place an order for MAX1261BEEI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1261BEEI+ 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 MAX1261BEEI+ reliable?
The price and inventory of MAX1261BEEI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1261BEEI+ is usually 5 days.
3.What payment methods are accepted for MAX1261BEEI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1261BEEI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1261BEEI+?
MAX1261BEEI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1261BEEI+ 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 MAX1261BEEI+?
For technical support, including MAX1261BEEI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1261BEEI+ requirements.
6.How does Aetrix verify that MAX1261BEEI+ is sourced from the original manufacturer or authorized distributors?
All MAX1261BEEI+ 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 MAX1261BEEI+ meets industry standards.
7.What is the process for return or replacement of MAX1261BEEI+?
All MAX1261BEEI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1261BEEI+, 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 MAX1261BEEI+ part is unused and in its original packaging.
Return procedure for MAX1261BEEI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX1261BEEI+ Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
