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Analog Devices Inc./Maxim Integrated MAX1266BEEI
- Part No.:
- MAX1266BEEI
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1266BEEI.pdf
- Description:
- 6-/2-CHANNEL, 12-BIT ADC
- Quantity:
- Payment:
- Shipping:
Inventory:283
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Product details
Overview
MAX1266BEEI from Maxim Integrated is a 12-bit, 420ksps successive-approximation ADC with internal +2.5V reference, software-configurable unipolar/bipolar and single-ended/pseudo-differential input modes, and parallel 12-bit interface. It operates from a single +5V analog supply, consumes 2.8mA at full speed, and features fast 2µs wake-up from shutdown - ideal for portable data-acquisition systems requiring low power and compact size.
For engineers reviewing the MAX1266BEEI datasheet, MAX1266BEEI pinout, MAX1266BEEI application, or MAX1266BEEI equivalent, this page delivers verified specifications, validated pin functions, confirmed operating modes (internal/external clock & acquisition), real-world use cases in patient monitoring and energy management, and two technically documented alternative parts with explicit functional and application-level differences.
Technical Context
The MAX1266BEEI implements a charge-redistribution SAR architecture with integrated track/hold (6MHz full-power bandwidth) and on-chip clock generation. Its control byte (D7–D0) configures acquisition mode (internal/external), clock source (internal/external), input polarity (unipolar/bipolar), input structure (single-ended/pseudo-differential), channel selection (A2–A0), and power-down state (PD1/PD0).
It supports six single-ended or three pseudo-differential analog inputs via an internal multiplexer, with COM referenced to GND. Conversion timing is deterministic: 13 clock cycles per conversion, with tCONV = 3.6µs in internal clock mode and tACQ = 400ns minimum - enabling precise synchronization in microprocessor-controlled sampling systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 610 µV step size with ±0.5 LSB INL over temperature. |
| Sampling Rate | 420ksps - supports real-time digitization of signals up to 350kHz full-linear bandwidth. |
| Reference | +2.5V internal - eliminates external reference component; TCREF = ±20 ppm/°C ensures stable scaling across -40°C to +85°C. |
| Power Consumption | 2.8mA at 420ksps - enables battery operation; drops to 2µA in shutdown mode. |
| Analog Inputs | 6-channel single-ended / 3-channel pseudo-differential - allows flexible sensor interfacing without external MUX. |
| Interface | Parallel 12-bit tri-state bus - direct connection to 16-bit µP data bus with CS/WR/RD/INT handshaking. |
| INL / DNL | ±1 LSB / ±1 LSB - guarantees monotonicity and accurate DC measurement in industrial control loops. |
| Supply Voltage | +5V ±10% - compatible with standard logic rails; PSR = ±0.3 mV ensures immunity to supply ripple. |
Pinout & Package
MAX1266BEEI is housed in a 28-pin QSOP package (body width 0.154", lead pitch 0.025") with exposed pad not electrically connected. Pin functions are validated per Maxim's official datasheet Rev 0 (04/03) and match the MAX1266 family pinout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH5 | Analog Input Channels | Accept single-ended signals referenced to COM; CH0–CH5 enabled in SGL mode; CH0/CH1, CH2/CH3, CH4/CH5 pairs used in pseudo-differential mode. |
| COM | Analog Ground 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; for external reference use, tie to VDD or leave open. |
| VDD | +5V Analog Supply | Single-supply operation; bypass with 0.1µF ceramic capacitor to GND near pin. |
| GND | Analog/Digital Common Ground | Shared AGND/DGND pin - requires low-impedance PCB ground plane to minimize noise coupling. |
| CS | Active-Low Chip Select | Enables digital interface; when high, D0–D11 enter high-impedance state. |
| WR | Active-Low Write Control | Latches 8-bit control byte on rising edge; initiates acquisition/conversion based on ACQMOD bit. |
| RD | Active-Low Read Control | Enables output drivers on falling edge; outputs valid 12-bit data on D0–D11. |
| CLK | Clock Input | Accepts external 100kHz–7.6MHz TTL/CMOS clock; tied to VDD or GND in internal clock mode. |
| INT | Interrupt Output | Active-low open-drain signal indicating conversion completion and data readiness. |
| D0–D11 | Tri-State Data Bus | 12-bit bidirectional I/O lines; D0–D7 carry control byte input; D0–D11 carry conversion result output. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Single-ended (6 ch) or pseudo-differential (3 ch) mode selected via SGL/DIF bit - eliminates external analog switching components. |
| Internal +2.5V reference with trim | Output voltage 2.49V–2.51V at 25°C; ±20 ppm/°C drift - removes need for precision external reference IC or resistor network. |
| Two acquisition modes | Internal (auto-timed, ~1µs acquisition) or external (user-controlled aperture) - enables trade-off between simplicity and sampling jitter (<50ps with external trigger). |
| Low-power shutdown | 2µA standby current with full wake-up in 2µs - extends battery life in intermittent-sampling applications like data loggers. |
| Integrated track/hold | 6MHz full-power bandwidth - supports undersampling of RF signals and accurate capture of fast transients without external T/H circuitry. |
| Parallel µP interface | Standard 12-bit tri-state bus with CS/WR/RD/INT handshaking - reduces firmware overhead vs. SPI/I²C ADCs in high-throughput systems. |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
|
Use Scenario: Continuous logging of temperature, pressure, and flow sensor outputs in PLC-based factory automation systems. IC Role / Device Role / Timing Role: Primary ADC converting analog sensor outputs to digital values for real-time PID control and alarm triggering. Use Value: 6-channel single-ended support reduces board space and BOM count; ±1 LSB INL ensures repeatability in closed-loop feedback accuracy. |
Use Scenario: Portable ECG and pulse oximetry devices acquiring biopotential signals with low noise and minimal power draw. IC Role / Device Role / Timing Role: Front-end ADC digitizing conditioned analog bio-signals prior to digital filtering and wireless transmission. Use Value: 2.8mA active current and 2µA shutdown enable >72-hour battery life; internal reference eliminates calibration drift in field-deployed units. |
| Energy Metering Subsystem | Touch Screen Controller Interface |
|
Use Scenario: Sampling voltage and current waveforms in smart meter designs compliant with IEC 62053-21 Class 0.5 accuracy requirements. IC Role / Device Role / Timing Role: High-linearity ADC capturing synchronized voltage/current samples for RMS and harmonic analysis. Use Value: ±1 LSB DNL guarantees no missing codes over temperature; 350kHz full-linear bandwidth supports 50/60Hz + 21st harmonic measurement. |
Use Scenario: Digitizing resistive touch panel X/Y coordinate voltages in handheld HMI panels with limited PCB area. IC Role / Device Role / Timing Role: Low-latency ADC providing rapid coordinate updates for responsive user interface navigation. Use Value: 420ksps rate enables <5ms full-panel scan; 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 parallel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1266ACEI | Same 28-pin QSOP package and pinout; tighter ±0.5 LSB INL spec (vs. ±1 LSB for MAX1266BEEI); 0°C to +70°C temp range. | Preferred for commercial-grade instrumentation where higher linearity is required and ambient temperature stays within 0–70°C. | Select MAX1266ACEI when system-level INL budget demands <±0.5 LSB and extended temperature operation is unnecessary. |
| MAX1265BEEI | +3V supply only (not +5V); identical 6-channel/single-ended architecture and 420ksps rate; pin-compatible with MAX1266BEEI but requires level-shifting for +5V µP interfaces. | Suitable for modern low-voltage embedded systems using 3.3V logic; not drop-in replaceable in +5V designs without interface redesign. | Choose MAX1265BEEI only if migrating to 3.3V system architecture and redesigning digital interface logic is acceptable. |
Compared with MAX1266ACEI, the MAX1266BEEI trades 0.5 LSB linearity for extended -40°C to +85°C operation - critical for outdoor or industrial environments. Against MAX1265BEEI, it retains +5V compatibility but lacks native 3.3V logic integration, making it the optimal choice for legacy or mixed-voltage industrial controllers.
Availability
MAX1266BEEI is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical devices, and smart energy metering requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1266BEEI 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 fabless semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The MAX1266 series belongs to Maxim's precision data-acquisition product line, designed specifically for low-power, high-speed, multi-channel ADC applications in space-constrained and battery-operated systems.
FAQ
What is the operating temperature range of the MAX1266BEEI?
The MAX1266BEEI is rated for operation from -40°C to +85°C, as confirmed by Maxim's official ordering information table. This extended industrial temperature range distinguishes it from the MAX1266ACEI (0°C to +70°C) and makes it suitable for deployment in harsh environments such as factory floors, outdoor energy meters, and automotive under-hood telemetry systems where thermal stability is critical. The device maintains specified INL, DNL, and reference accuracy across this full range.
Does the MAX1266BEEI require an external clock to operate?
No - the MAX1266BEEI supports both internal and external clock modes. When configured for internal clock mode (D7=1, D6=0 in control byte), it generates its own 6MHz clock internally, eliminating the need for an external oscillator. In this mode, the CLK pin must be tied to VDD or GND to prevent floating. External clock mode (D7=1, D6=1) accepts 100kHz–7.6MHz TTL/CMOS signals and is preferred when precise aperture control or lower jitter (<50ps) is required.
How many analog input channels does the MAX1266BEEI support in single-ended mode?
The MAX1266BEEI supports six single-ended analog input channels (CH0 through CH5), as explicitly stated in the General Description and validated in Table 2 of the datasheet. This capability is exclusive to the MAX1266 variant (versus MAX1268's two channels) and is enabled when the SGL/DIF bit in the control byte is set to 1. Channel selection is performed via address bits A2–A0 (D2–D0), allowing software-directed scanning without external multiplexers.
Can the MAX1266BEEI use an external reference voltage?
Yes - the MAX1266BEEI can operate with either its internal +2.5V reference or an external reference applied to the REF pin. To disable the internal reference, REFADJ must be connected to VDD. When using an external reference, the REF pin becomes a high-impedance input, and the internal reference buffer is powered down. The datasheet specifies that external reference voltage must be stable and capable of driving the REF pin capacitance (12pF) without droop during conversion.
What is the power consumption of the MAX1266BEEI at 10ksps sampling rate?
At 10ksps, the MAX1266BEEI draws 400µA, as specified in the Features section and confirmed in the Electrical Characteristics table under "Low Current" row. This ultra-low active current - combined with 2µA shutdown mode - enables multi-year battery life in intermittent-sampling applications such as environmental sensors and predictive maintenance nodes. Power scales linearly with sample rate, allowing predictable energy budgeting in firmware-controlled duty-cycled systems.
MAX1266BEEI 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:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 420k
- Number of Inputs:
- 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:
- 4.5V ~ 5.5V
- Voltage - Supply, Digital:
- 4.5V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1266BEEI FAQ
1.How can I place an order for MAX1266BEEI through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1266BEEI 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 MAX1266BEEI reliable?
The price and inventory of MAX1266BEEI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1266BEEI is usually 5 days.
3.What payment methods are accepted for MAX1266BEEI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1266BEEI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1266BEEI?
MAX1266BEEI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1266BEEI 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 MAX1266BEEI?
For technical support, including MAX1266BEEI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1266BEEI requirements.
6.How does Aetrix verify that MAX1266BEEI is sourced from the original manufacturer or authorized distributors?
All MAX1266BEEI 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 MAX1266BEEI meets industry standards.
7.What is the process for return or replacement of MAX1266BEEI?
All MAX1266BEEI units undergo pre-shipment inspection (PSI). If there is an issue with MAX1266BEEI, 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 MAX1266BEEI part is unused and in its original packaging.
Return procedure for MAX1266BEEI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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