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Analog Devices Inc./Maxim Integrated MAX1249BEEE+T
- Part No.:
- MAX1249BEEE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1249BEEE+T.pdf
- Description:
- IC ADC 10BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,609
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Product details
Overview
MAX1249BEEE+T from Maxim Integrated is a 10-bit, 4-channel serial analog-to-digital converter (ADC) with integrated track/hold, software-configurable unipolar/bipolar and single-ended/differential inputs, and SPI/QSPI/MICROWIRE-compatible 4-wire interface. It operates from a single +2.7V to +5.25V supply, consumes only 54µA at 1ksps (+3V), and supports external reference input at VREF pin. It is used in portable data loggers and battery-powered medical instruments requiring low-power, high-accuracy digitization of sensor signals.
For engineers reviewing the MAX1249BEEE+T datasheet, MAX1249BEEE+T pinout, MAX1249BEEE+T application, or MAX1249BEEE+T equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated QSOP-16 pin functions, confirmed alternative parts with functional distinctions, and supply-chain support details specific to OEM and embedded design use cases.
Technical Context
The MAX1249BEEE+T uses successive-approximation architecture with an internal track/hold circuit that acquires input signals in ≤1.5µs and supports both internal clock mode (7.5µs max conversion time) and external clock mode (15 clocks/conversion at 2MHz). Its analog front-end accepts 4 single-ended or 2 pseudo-differential input pairs (CH0/CH1, CH2/CH3), with COM pin serving as common-mode reference.
It requires an external 2.500V reference applied to the VREF pin, features a reference-buffer amplifier with ±1.5% adjustment range via REFADJ, and implements three-level SHDN control (low = full shutdown, high = internal compensation, float = external compensation). Digital interface timing complies with SPI (CPOL=0, CPHA=0), QSPI, and MICROWIRE protocols without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output codes for precise sensor signal digitization |
| Sampling Rate | 133ksps maximum - enables real-time capture of fast transients in system supervision applications |
| Analog Input Range | 0V to VREF (unipolar) or ±VREF/2 (bipolar) - supports both ground-referenced and centered differential measurements |
| INL / DNL | ±1 LSB / ±1 LSB - ensures monotonicity and <0.1% full-scale linearity error across temperature |
| Supply Current | 54µA at 1ksps (+3V) - allows >1-year battery life in low-duty-cycle portable instruments |
| Reference Requirement | External 2.500V at VREF pin - decouples accuracy from supply rail, enabling stable conversion under varying VDD |
| Operating Voltage | +2.7V to +5.25V - compatible with Li-ion, 3.3V, and 5V system rails without level-shifting |
Pinout & Package
MAX1249BEEE+T is housed in a 16-pin QSOP package (5.3mm × 10.2mm footprint, same board area as 8-pin SO), optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive supply input | Accepts +2.7V to +5.25V; powers analog and digital sections; bypass with 0.1µF to AGND |
| CH0–CH3 | Analog input channels | Selectable as single-ended inputs or differential pairs (CH0/CH1, CH2/CH3); each has 15pF input capacitance |
| COM | Analog common reference | Sets zero-code voltage in single-ended mode; must remain stable within ±0.5LSB during conversion |
| SHDN | Three-state shutdown control | Low = full power-down (<1µA); high = internal compensation; float = external compensation mode |
| VREF | External reference input | 2.500V nominal reference voltage input; requires 4.7µF capacitor for stability when buffer enabled |
| REFADJ | Reference buffer adjust | Enables ±1.5% VREF tuning; tie to VDD to disable internal reference buffer (required for MAX1249) |
| SCLK | Serial clock input | Drives data I/O and (in external clock mode) controls SAR conversion timing; 40–60% duty cycle required |
| CS | Chip select (active-low) | Enables serial interface; DOUT enters high-impedance state when CS = high |
| DIN | Serial data input | Receives 8-bit control byte (START, channel select, UNI/BIP, SGL/DIF, PD1/PD0) on SCLK rising edge |
| DOUT | Serial data output | Outputs 10-bit result MSB-first on SCLK falling edge; high-impedance when CS = high |
| SSTRB | Serial strobe output | Signals conversion start/end: low during conversion in internal clock mode; one-clock pulse before MSB in external mode |
| AGND / DGND | Analog and digital grounds | Must be connected at single point near device; AGND carries sensitive analog return current |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input modes | Single-ended or pseudo-differential operation selectable per conversion via control byte - eliminates hardware reconfiguration for multi-sensor systems |
| Low-power shutdown architecture | 1µA shutdown current with automatic wake-on-CS assertion - enables microcontroller-driven burst sampling without external power sequencing |
| SPI/QSPI/MICROWIRE compatibility | No external logic required; CPOL=0/CPHA=0 configuration matches standard µC peripherals - reduces BOM and layout complexity |
| Track/hold acquisition time | ≤1.5µs minimum - supports accurate sampling of signals up to 2.25MHz small-signal bandwidth with minimal droop |
| Reference buffer with adjustment | ±1.5% VREF tuning via REFADJ pin - compensates for external reference drift or tolerances without trimming resistors |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure over days. IC Role / Device Role / Timing Role: ADC digitizes analog sensor outputs with 10-bit resolution and configurable input ranges to match sensor output spans. Use Value: 54µA active current at 1ksps extends coin-cell life beyond 12 months; QSOP-16 footprint minimizes PCB area in compact enclosures. |
Use Scenario: Handheld ECG monitor acquiring lead-II differential signals with low noise and DC stability. IC Role / Device Role / Timing Role: Pseudo-differential ADC converts CH0/CH1 pair with COM referenced to mid-supply, rejecting common-mode interference. Use Value: ±1 LSB INL ensures diagnostic-grade amplitude fidelity; external 2.500V reference guarantees consistent scaling across units and batches. |
| Battery-Powered Test Equipment | Industrial System Supervision |
Use Scenario: Portable multimeter measuring DC voltage, current, and resistance using shared analog front-end. IC Role / Device Role / Timing Role: 4-channel multiplexer selects between voltage divider, shunt resistor, and thermistor networks under software control. Use Value: Software-selectable unipolar/bipolar and single-ended/differential modes eliminate need for external op-amp gain stages or polarity reversal circuits. |
Use Scenario: PLC module monitoring power supply rails, fan tachometers, and temperature sensors across multiple zones. IC Role / Device Role / Timing Role: ADC performs periodic polling of 4 independent analog points with programmable sample rate and power-down between reads. Use Value: Full power-down mode (<1µA) between conversions cuts average current to sub-µA levels, reducing thermal load and self-heating errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-bit resolution, 200ksps, internal reference only, no SHDN pin | Lacks bipolar mode, lower resolution limits dynamic range in precision sensor apps | Choose for cost-sensitive, high-speed 8-bit applications where external reference and shutdown control are not required |
| MAX11100ETE+ | 12-bit resolution, 1MSPS, internal reference, SPI-only interface, 16-TQFN | Higher speed/resolution but higher power (1.8mA active); no REFADJ or SSTRB | Choose when 12-bit accuracy and faster throughput justify increased supply current and loss of strobe signaling |
Compared with ADS7822U and MAX11100ETE+, the MAX1249BEEE+T uniquely balances 10-bit precision, ultra-low 54µA active current, external reference flexibility, and three-level shutdown-making it optimal for long-life, multi-range, battery-operated measurement systems where configurability and power efficiency are co-prioritized.
Availability
MAX1249BEEE+T is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and industrial system supervision requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX1249BEEE+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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and portable applications.
The MAX1249BEEE+T belongs to Maxim's low-power serial ADC product line, engineered specifically for battery-operated instrumentation requiring high accuracy, flexible input configuration, and minimal quiescent current across extended temperature ranges.
FAQ
What is the reference requirement for MAX1249BEEE+T?
The MAX1249BEEE+T requires an external 2.500V reference applied to the VREF pin. Unlike the MAX1248, it does not include an internal reference. The reference-buffer amplifier can be disabled by tying REFADJ to VDD, and the device supports ±1.5% VREF adjustment when the buffer is active. This external reference architecture ensures conversion accuracy remains independent of VDD variations.
Does MAX1249BEEE+T support differential input mode?
Yes, the MAX1249BEEE+T supports pseudo-differential input mode using two channel pairs: CH0/CH1 and CH2/CH3. In this mode, the device samples the voltage difference between the selected positive and negative inputs, with COM serving as the common-mode reference point. The input configuration is controlled via the SGL/DIF bit in the 8-bit control byte, and COM must remain stable within ±0.5LSB during conversion.
What are the power consumption characteristics of MAX1249BEEE+T?
The MAX1249BEEE+T draws 54µA at 1ksps with a +3V supply, 1.2mA at 133ksps, and less than 1µA in full power-down mode. Its quick turn-on time allows it to be powered down between conversions without sacrificing sampling rate. Supply current scales linearly with clock frequency and is specified across the full +2.7V to +5.25V operating range, making it ideal for energy-constrained portable designs.
How is the shutdown function implemented on MAX1249BEEE+T?
The MAX1249BEEE+T implements a three-level SHDN pin: pulling SHDN low enables full power-down (<1µA), letting it float configures the reference buffer for external compensation, and pulling it high selects internal compensation mode. This allows fine-grained control over reference stability and power state without requiring additional control lines or firmware overhead.
Which serial interface protocols is MAX1249BEEE+T compatible with?
The MAX1249BEEE+T is compatible with SPI (CPOL=0, CPHA=0), QSPI, and MICROWIRE protocols using its 4-wire interface (SCLK, DIN, DOUT, CS). It requires no external logic for protocol translation. The SSTRB output provides direct TMS320-family DSP synchronization, and the serial strobe timing is fully defined for both internal and external clock modes in the datasheet.
MAX1249BEEE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 133k
- Number of Inputs:
- 2, 4
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1249BEEE+T FAQ
1.How can I place an order for MAX1249BEEE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1249BEEE+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 MAX1249BEEE+T reliable?
The price and inventory of MAX1249BEEE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1249BEEE+T is usually 5 days.
3.What payment methods are accepted for MAX1249BEEE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1249BEEE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1249BEEE+T?
MAX1249BEEE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1249BEEE+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 MAX1249BEEE+T?
For technical support, including MAX1249BEEE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1249BEEE+T requirements.
6.How does Aetrix verify that MAX1249BEEE+T is sourced from the original manufacturer or authorized distributors?
All MAX1249BEEE+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 MAX1249BEEE+T meets industry standards.
7.What is the process for return or replacement of MAX1249BEEE+T?
All MAX1249BEEE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1249BEEE+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 MAX1249BEEE+T part is unused and in its original packaging.
Return procedure for MAX1249BEEE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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