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Analog Devices Inc./Maxim Integrated MAX1261BEEI+T
- Part No.:
- MAX1261BEEI+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1261BEEI+T.pdf
- Description:
- IC ADC 12BIT SAR 28QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,757
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Product details
Overview
MAX1261BEEI+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 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+T datasheet, MAX1261BEEI+T pinout, MAX1261BEEI+T application, or MAX1261BEEI+T equivalent, key selection criteria include its -40°C to +85°C industrial temperature range, software-configurable unipolar/bipolar input mode, fast 2µs wake-up from shutdown, and low 1.9mA active current at 250ksps - critical for portable medical and energy monitoring systems.
Technical Context
The MAX1261BEEI+T implements a charge-redistribution SAR architecture with an internal track/hold stage offering 3MHz full-power bandwidth and 250kHz full-linear bandwidth. Its control byte (D7–D0) configures acquisition mode (internal/external), clock source (internal/external), input polarity (unipolar/bipolar), and input topology (single-ended/pseudo-differential).
It supports two power-down modes: standby (10µA) and full shutdown (2µA), triggered via PD0/PD1 bits in the control byte. The parallel interface uses CS/WR/RD handshaking with INT interrupt output and HBEN-controlled 12-bit data multiplexing across D0–D7 and D0/D8–D3/D11 pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for precision measurement of sensor signals or process variables. |
| Sampling Rate | 250ksps - supports real-time capture of transients up to 125kHz (Nyquist-limited) without aliasing when paired with anti-alias filter. |
| INL / DNL | ±0.5 LSB / ±1 LSB - ensures monotonicity and <0.012% full-scale linearity error for calibration-critical applications like patient monitoring. |
| Reference | +2.5V internal bandgap - eliminates external reference component count and provides ±2ppm/°C tempco for stable scaling over -40°C to +85°C. |
| Supply Current | 1.9mA at 250ksps - enables >500-hour operation on a 1000mAh Li-ion cell in continuous acquisition mode. |
| Power-Down Current | 2µA - reduces average system power by >99% during idle intervals in duty-cycled data loggers. |
| Analog Input Range | 0V to +2.5V (unipolar) or ±1.25V (bipolar) - matches common sensor output ranges without external level-shifting circuitry. |
Pinout & Package
MAX1261BEEI+T is housed in a 28-pin QSOP package (5.3mm × 10.2mm, 0.65mm pitch), optimized for space-constrained industrial PCBs. Pin functions are validated per Maxim's official datasheet Rev 0 (04/03).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Analog supply input | +2.7V to +3.6V analog rail; requires 0.1µF bypass to GND for noise immunity during conversion. |
| VLOGIC | Digital I/O supply | +1.8V to +3.6V logic interface voltage - decouples µP voltage domain from analog domain. |
| REF | Internal reference output / external ref input | Provides +2.5V reference; requires 4.7µF capacitor to GND when internal ref is enabled. |
| COM | Analog ground reference | Zero-code reference point; must remain stable to ±0.5 LSB during conversion for accuracy. |
| CH0–CH7 | Analog input channels | 8 single-ended inputs; configurable as 4 pseudo-differential pairs (e.g., CH0/CH1) for noise rejection. |
| CS, WR, RD | Parallel interface controls | Enable chip select, write strobe, and read strobe - compatible with standard 8051/ARM GPIO timing. |
| INT | Conversion completion flag | Active-low interrupt signals valid data ready; resets on first RD cycle or new control byte write. |
| D0–D7 / D0/D8–D3/D11 | Tri-state data bus | HBEN selects 8 LSBs (HBEN=0) or 4 MSBs (HBEN=1); eliminates need for 12-bit wide data bus. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Single-ended (8 ch) or pseudo-differential (4 ch) mode selected via SGL/DIF bit - enables flexible sensor interfacing without hardware changes. |
| Internal track/hold with 3MHz bandwidth | Supports undersampling of high-frequency transients (e.g., motor current spikes) while maintaining DC accuracy. |
| Byte-wide (8+4) parallel interface | Reduces µP data bus width requirement and simplifies firmware - no serial protocol overhead or timing-critical bit-banging. |
| Two-stage power-down control | Standby (10µA) and full shutdown (2µA) modes reduce quiescent current by 3 orders of magnitude vs. active operation. |
| On-chip +2.5V reference with ±2ppm/°C drift | Eliminates external reference IC and associated layout complexity while meeting 0.1% total unadjusted error (TUE) requirements. |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous logging of temperature, pressure, and flow sensor outputs in factory automation PLCs. IC Role / Device Role / Timing Role: Primary analog front-end ADC converting 8 analog sensor channels into digital data for real-time control loop execution. Use Value: 250ksps sampling rate captures rapid process transients; ±0.5 LSB INL ensures traceable calibration compliance per ISO 5725. |
Use Scenario: Portable ECG and SpO₂ monitors requiring low-power, high-accuracy signal digitization. IC Role / Device Role / Timing Role: Bipolar-mode ADC digitizing differential biopotential signals with COM-referenced zero baseline. Use Value: 67dB SINAD and 2µs wake-up enable artifact-free waveform capture during battery-operated intermittent monitoring. |
| Smart Energy Metering | Touchscreen Controller Interface |
Use Scenario: Residential electricity meters measuring voltage/current waveforms for RMS, harmonics, and power factor calculation. IC Role / Device Role / Timing Role: High-linearity ADC sampling isolated CT/PT secondary outputs at 250ksps for Class 0.5 metering accuracy. Use Value: Internal +2.5V reference stability (±2ppm/°C) maintains metrology-grade accuracy across extended temperature ranges. |
Use Scenario: Resistive touchscreen digitizers in handheld HMI devices requiring fast coordinate acquisition. IC Role / Device Role / Timing Role: Single-ended ADC scanning X/Y electrode pairs with software-selectable channel sequencing. Use Value: 8-channel mux and 250ksps rate support <10ms full-screen touch scan, enabling 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 | 2.7V–5.25V supply; SPI interface; no internal reference; 200ksps max rate | Requires external reference and µP SPI driver; lower sampling rate limits transient capture capability | Choose for designs already using SPI peripherals and needing wider supply range. |
| AD7490BRUZ | 16-channel, 1MSPS, +2.7V–5.25V; internal 2.5V ref; parallel interface; 12-bit resolution | Higher channel count and speed but larger 28-TSSOP package and 12mA active current | Choose when expanding to >8 channels or requiring >250ksps without oversampling. |
Compared with ADS7822U and AD7490BRUZ, MAX1261BEEI+T uniquely balances low power (1.9mA), integrated reference, industrial temperature grade (-40°C to +85°C), and compact QSOP packaging - making it optimal for space- and battery-constrained embedded data acquisition where parallel interface simplicity is valued.
Availability
MAX1261BEEI+T is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical instrumentation, smart energy metering, and touchscreen controller applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1261BEEI+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications markets.
The MAX1261BEEI+T belongs to Maxim's precision data acquisition product line, designed specifically for low-power, high-accuracy sensor interfacing in battery-operated and space-constrained embedded systems.
FAQ
What is the operating temperature range of the MAX1261BEEI+T?
The MAX1261BEEI+T is rated for operation from -40°C to +85°C, qualifying it for industrial and automotive cabin environments. This extended range is confirmed in the Ordering Information table of the datasheet, where "BEEI" suffix denotes the -40°C to +85°C grade. The device maintains specified INL, DNL, and reference accuracy across this full range without derating.
Does the MAX1261BEEI+T require an external clock source?
No, the MAX1261BEEI+T supports both internal and external clock modes. When configured for internal clock mode (D7=1, D6=0 in control byte), it generates its own 3MHz conversion clock, eliminating external oscillator components. The CLK pin must be tied high or low in this mode to prevent floating. External clock mode accepts 100kHz–4.8MHz TTL/CMOS inputs.
How does the HBEN pin function on the MAX1261BEEI+T?
The HBEN (High Byte Enable) pin on the MAX1261BEEI+T controls multiplexing of the 12-bit conversion result onto the 8-bit data bus. When HBEN = 0, D0–D7 carry the 8 LSBs; when HBEN = 1, D0–D3 carry the 4 MSBs (D0/D8–D3/D11). This allows full 12-bit resolution access using only an 8-bit µP data bus without requiring additional address lines or latches.
Can the MAX1261BEEI+T operate with a 1.8V digital supply?
Yes, the MAX1261BEEI+T supports VLOGIC from +1.8V to +3.6V, enabling direct interfacing with modern low-voltage microcontrollers. Electrical Characteristics tables confirm VIH/VIL thresholds scale with VLOGIC (e.g., VIH = 1.5V min at VLOGIC = 1.8V), and output drive strength remains functional across this range. VDD must still be maintained at +2.7V to +3.6V for analog performance.
What is the maximum analog input voltage range for the MAX1261BEEI+T?
In unipolar mode, the MAX1261BEEI+T accepts 0V to +2.5V (referenced to COM); in bipolar mode, it accepts -1.25V to +1.25V (±VREF/2). Absolute input limits are GND to VDD per Absolute Maximum Ratings. Exceeding VDD + 50mV or falling below GND - 50mV degrades accuracy, though internal protection diodes prevent damage up to GND - 300mV and VDD + 300mV.
MAX1261BEEI+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:
- 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+T FAQ
1.How can I place an order for MAX1261BEEI+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1261BEEI+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 MAX1261BEEI+T reliable?
The price and inventory of MAX1261BEEI+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1261BEEI+T is usually 5 days.
3.What payment methods are accepted for MAX1261BEEI+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1261BEEI+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1261BEEI+T?
MAX1261BEEI+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1261BEEI+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 MAX1261BEEI+T?
For technical support, including MAX1261BEEI+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1261BEEI+T requirements.
6.How does Aetrix verify that MAX1261BEEI+T is sourced from the original manufacturer or authorized distributors?
All MAX1261BEEI+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 MAX1261BEEI+T meets industry standards.
7.What is the process for return or replacement of MAX1261BEEI+T?
All MAX1261BEEI+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1261BEEI+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 MAX1261BEEI+T part is unused and in its original packaging.
Return procedure for MAX1261BEEI+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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