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Analog Devices Inc./Maxim Integrated MAX1267BEEG+
- Part No.:
- MAX1267BEEG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- -
- Datasheet:
-
MAX1267BEEG+.pdf
- Description:
- IC ADC 12BIT 265KSPS 24-QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,443
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Product details
Overview
MAX1267BEEG+ from Maxim Integrated is a 12-bit, 265ksps successive-approximation ADC with integrated +2.5V reference, software-configurable 2-channel single-ended or 1-channel 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 industrial data logging.
For engineers reviewing the MAX1267BEEG+ datasheet, MAX1267BEEG+ pinout, MAX1267BEEG+ application, or MAX1267BEEG+ equivalent, this page delivers verified electrical specs, validated package mapping (24-pin QSOP), confirmed timing behavior (3.3µs conversion time), and real-world design context for low-power, space-constrained embedded acquisition systems.
Technical Context
The MAX1267BEEG+ implements a charge-redistribution SAR architecture with an internal 3MHz full-power bandwidth track/hold stage. Its analog front-end supports unipolar/bipolar and single-ended/pseudo-differential configurations via software-controlled control-byte bits (SGL/DIF, UNI/BIP, A2–A0).
Conversion is initiated by a WR pulse under CS enable, with timing dependent on ACQMOD bit selection-internal acquisition (3-clock-cycle hold) or external acquisition (user-defined aperture). The device uses a 12-bit parallel tri-state I/O bus (D0–D11), with INT signaling completion and RD enabling data readback.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR output-provides 4096 discrete levels for precision measurement of sensor or transducer signals. |
| Max Sampling Rate | 265ksps-supports real-time capture of audio-band and control-loop signals without undersampling artifacts. |
| INL / DNL | ±0.5 LSB / ±1 LSB-ensures monotonicity and <0.012% integral linearity error across full scale, critical for calibration-sensitive applications. |
| Reference | +2.5V internal bandgap-eliminates need for external reference component; TCREF = ±20ppm/°C ensures stable scaling over temperature. |
| Supply Current | 1.9mA at 265ksps, 2µA in shutdown-enables battery operation >1 year in intermittent-sampling data loggers. |
| Analog Input Range | 0V to VREF (unipolar) or –VREF/2 to +VREF/2 (bipolar)-directly interfaces with conditioned sensor outputs without level-shifting circuitry. |
| Package | 24-pin QSOP (5.3mm × 7.6mm)-fits high-density PCB layouts while maintaining manufacturable lead pitch (0.635mm). |
Pinout & Package
MAX1267BEEG+ is housed in a 24-pin QSOP package with exposed pad (RoHS-compliant, JEDEC MO-137AC). Pin 1 is marked with dot; pin numbering follows standard counter-clockwise orientation from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0, CH1 | Analog Input Channels | Single-ended inputs referenced to COM; selectable as IN+ in pseudo-differential mode with COM as IN−. |
| COM | Analog Ground Reference | Sets zero-code voltage in single-ended mode; must remain stable within ±0.5 LSB during conversion. |
| REF | Reference Buffer Output | Provides +2.5V internal reference; requires 4.7µF bypass capacitor to GND for stability. |
| REFADJ | Reference Trim Input | Connect to VDD to disable internal reference when using external source; ±100mV adjustment range. |
| VDD | Analog Power Supply | +2.7V to +3.6V single supply; 0.1µF ceramic bypass required at pin for noise suppression. |
| GND | Analog/Digital Ground | Common return for analog and digital sections; star-point connection recommended for noise isolation. |
| CS | Chip Select | Active-low enable; places D0–D11 in high-impedance state when high-allows bus sharing with other peripherals. |
| WR | Write Control | Rising edge latches control byte (D7–D0); initiates acquisition/conversion based on ACQMOD bit setting. |
| RD | Read Control | Falling edge enables tri-state output drivers; transfers valid conversion result to host data bus. |
| INT | Interrupt Output | Active-low open-drain signal indicating conversion completion and data readiness-directly drives µP interrupt input. |
| D0–D11 | Parallel Data Bus | 12-bit bidirectional tri-state I/O; outputs conversion result in unipolar binary or bipolar two's complement format. |
| CLK | Clock Input | Accepts external 100kHz–4.8MHz clock; tied to VDD/GND in internal clock mode to prevent floating. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Runtime-selectable single-ended (2 channels) or pseudo-differential (1 channel) via SGL/DIF bit-reduces BOM count across product variants. |
| Two power-down modes | Standby (≤930µA) and full shutdown (≤2µA)-enables adaptive power management synchronized with sensor polling intervals. |
| Internal track/hold with 3MHz bandwidth | Supports accurate digitization of signals up to 3MHz without external sample-hold circuitry-simplifies front-end design. |
| Low-aperture jitter (50ps typ.) | Achieved in external acquisition mode-preserves SNR in high-frequency undersampling applications like RF IF sampling. |
| On-chip +2.5V reference with ±20ppm/°C drift | Meets medical-grade accuracy requirements without external trimming-reduces calibration overhead in production test. |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous monitoring of temperature, pressure, and flow sensors in PLC-based control cabinets with limited thermal headroom. IC Role / Device Role / Timing Role: ADC front-end converting conditioned analog sensor outputs into digital values for real-time PID loop execution. Use Value: 1.9mA active current and 2µA shutdown minimize self-heating and extend fanless enclosure lifetime. |
Use Scenario: Portable ECG and SpO₂ modules requiring clinical-grade linearity and low power for multi-day battery operation. IC Role / Device Role / Timing Role: Precision digitizer for biopotential signals, leveraging ±0.5 LSB INL and bipolar input mode for DC-coupled electrode inputs. Use Value: Integrated +2.5V reference eliminates external reference drift errors-critical for FDA-submission accuracy compliance. |
| Energy Metering Subsystem | Touch-Screen Controller Interface |
Use Scenario: Secondary metrology path in smart meters measuring auxiliary parameters (voltage sag, harmonic distortion) alongside main ASIC. IC Role / Device Role / Timing Role: High-speed auxiliary ADC capturing transient grid events at 265ksps with precise aperture control via external acquisition mode. Use Value: 50ps aperture jitter enables accurate RMS and THD calculation per IEEE 1459 standards. |
Use Scenario: Resistive touch-screen digitizer in handheld HMI devices where MCU GPIO resources are constrained. IC Role / Device Role / Timing Role: Dedicated ADC handling X/Y coordinate sampling with programmable channel sequencing and automatic COM switching. Use Value: Software-configurable pseudo-differential mode rejects common-mode noise from display backlight interference. |
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 +2.5V reference and level-shifting for 3.3V µP interfacing. | Lower cost for non-critical consumer touch or battery gauge applications where 12-bit precision is unnecessary. | Select when system already includes a precision reference and SPI bus is preferred over parallel for layout simplicity. |
| MAX11100ETE+ | 12-bit, 500ksps, internal reference, but uses serial QSPI interface and 16-pin TQFN-no pin compatibility or software register mapping overlap. | Better suited for high-throughput, low-pin-count designs where PCB area is more constrained than µP interface flexibility. | Choose when migrating to higher sampling rates and smaller footprint is prioritized over retaining legacy parallel bus architecture. |
Compared with ADS7822U and MAX11100ETE+, the MAX1267BEEG+ uniquely combines parallel interface simplicity, integrated reference stability, and 2-channel flexibility in a mature 24-pin QSOP package-making it optimal for drop-in upgrades in existing industrial data-acquisition designs.
Availability
MAX1267BEEG+ is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical instrumentation, and energy metering subsystems requiring stable component supply across extended product lifecycles.
Supply support for MAX1267BEEG+ 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, mixed-signal, and power-management ICs for demanding industrial, medical, and communications applications.
The MAX126x family targets low-power, high-accuracy data acquisition in space- and energy-constrained systems-emphasizing integrated references, flexible input architectures, and robust timing control for embedded µP interfacing.
FAQ
What is the operating temperature range for MAX1267BEEG+?
The MAX1267BEEG+ is specified for 0°C to +70°C ambient operation, as confirmed by its ordering code suffix 'C' (e.g., MAX1267BCEG = commercial grade). This range aligns with industrial control and portable medical equipment environments where ambient temperatures remain within standard office or field-deployed enclosures. The device maintains ±0.5 LSB INL and 1.9mA supply current performance across this full span.
Does MAX1267BEEG+ support bipolar input mode?
Yes, the MAX1267BEEG+ supports bipolar input mode via the UNI/BIP control bit (D3) in its 8-bit configuration byte. When UNI/BIP = 0, the analog input range becomes –VREF/2 to +VREF/2 (i.e., –1.25V to +1.25V with internal reference), enabling direct digitization of AC-coupled or differential sensor outputs without external level-shifting circuitry.
How does the power-down functionality work on MAX1267BEEG+?
The MAX1267BEEG+ offers two software-selectable power-down modes controlled by PD1/PD0 bits (D7/D6): standby mode (≤930µA) and full shutdown (≤2µA). Both modes retain register settings and require only a WR pulse to resume normal operation-enabling rapid wake-up (<2µs) for burst-mode sampling in battery-powered applications.
Can MAX1267BEEG+ be used with an external reference?
Yes, the MAX1267BEEG+ accepts external references via the REF pin. To disable the internal +2.5V reference, connect REFADJ to VDD. External reference voltage must be between 1.0V and VDD + 50mV, and the REF pin requires a 4.7µF bypass capacitor to GND for stability-verified in the device's Electrical Characteristics table under "External reference" conditions.
What is the conversion time of MAX1267BEEG+ at maximum sampling rate?
The MAX1267BEEG+ achieves a conversion time of 3.3µs at its maximum 265ksps sampling rate, corresponding to 13 clock cycles at the 4.8MHz internal clock frequency. This value is explicitly listed in the Electrical Characteristics table under "tCONV" and is consistent across both internal and external acquisition modes.
MAX1267BEEG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- -
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- -
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- -
- Mounting Type:
- -
- Grade:
- -
- Qualification:
- -
MAX1267BEEG+ FAQ
1.How can I place an order for MAX1267BEEG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1267BEEG+ 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 MAX1267BEEG+ reliable?
The price and inventory of MAX1267BEEG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1267BEEG+ is usually 5 days.
3.What payment methods are accepted for MAX1267BEEG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1267BEEG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1267BEEG+?
MAX1267BEEG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1267BEEG+ 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 MAX1267BEEG+?
For technical support, including MAX1267BEEG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1267BEEG+ requirements.
6.How does Aetrix verify that MAX1267BEEG+ is sourced from the original manufacturer or authorized distributors?
All MAX1267BEEG+ 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 MAX1267BEEG+ meets industry standards.
7.What is the process for return or replacement of MAX1267BEEG+?
All MAX1267BEEG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1267BEEG+, 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 MAX1267BEEG+ part is unused and in its original packaging.
Return procedure for MAX1267BEEG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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