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Analog Devices Inc./Maxim Integrated MAX1249BCEE
- Part No.:
- MAX1249BCEE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1249BCEE.pdf
- Description:
- IC ADC 10BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,954
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Product details
Overview
MAX1249BCEE from Maxim Integrated is a 10-bit, 4-channel serial analog-to-digital converter (ADC) with integrated track/hold, multiplexer, and SPI/QSPI/MICROWIRE-compatible 4-wire interface. It operates from a single +2.7V to +5.25V supply, supports software-configurable unipolar/bipolar and single-ended/differential inputs, and achieves 133ksps conversion rate using an external 2MHz clock. It is used in portable data loggers requiring low-power, high-accuracy digitization of sensor signals.
For engineers reviewing the MAX1249BCEE datasheet, MAX1249BCEE pinout, MAX1249BCEE application, or MAX1249BCEE equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated QSOP-16 pin functions, confirmed alternative parts with documented functional differences, and supply-chain support details specific to OEM and embedded instrumentation programs.
Technical Context
The MAX1249BCEE uses successive-approximation register (SAR) architecture with an internal track/hold circuit that acquires input signals within 1.5µs and supports up to 2.25MHz small-signal bandwidth. Its analog front-end accepts four single-ended or two pseudo-differential input pairs (CH0/CH1, CH2/CH3), with COM pin establishing common-mode reference.
It features dual clock modes: external SCLK-driven conversion (15 clocks/conversion at 133ksps) or internal clock operation (7.5µs max conversion time), and includes a three-level SHDN pin enabling full power-down (1µA), fast power-down (54µA at 1ksps), or reference-buffer compensation control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output codes with no missing codes over temperature |
| Conversion Rate | 133ksps - enables real-time sampling of audio-band and control-loop signals without undersampling artifacts |
| INL (Relative Accuracy) | ±1 LSB - ensures monotonicity and <0.1% full-scale linearity error after calibration |
| Supply Current (Active) | 1.2mA at 133ksps, +3V - allows battery operation for >100 hours with typical 300mAh coin cell |
| Power-Down Current | 1µA - reduces system standby power by >99.9% versus active mode |
| Analog Input Range | 0V to VREF (unipolar) or ±VREF/2 (bipolar) - supports direct connection to transducer outputs without level-shifting |
| Reference Requirement | External 2.500V reference at VREF pin - decouples accuracy from supply rail noise and enables precision ratiometric sensing |
Pinout & Package
MAX1249BCEE is housed in a 16-pin QSOP package (5.3mm × 10.2mm footprint, same board area as standard 8-pin SO). This surface-mount package supports high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive supply input | Accepts +2.7V to +5.25V; powers analog and digital sections; requires local 0.1µF bypass to AGND |
| CH0–CH3 | Analog input channels | Four single-ended inputs or two differential pairs; each has ±0.3V absolute max rating beyond rails |
| COM | Analog common-mode reference | Sets zero-code voltage in single-ended mode; must be stable to ±0.5LSB (≈1.2mV) during conversion |
| SHDN | Three-level shutdown control | Low = full shutdown (1µA); high = internal compensation; float = external compensation mode for REFADJ |
| VREF | External reference input | Accepts 2.500V ±0.030V; internal buffer disabled (REFADJ tied to VDD); source impedance ≤18kΩ |
| REFADJ | Reference buffer disable/control | Tie to VDD to disable internal buffer; otherwise adjusts VREF gain (±1.5% range) when buffer enabled |
| SCLK | Serial clock input | Drives data I/O and (in external mode) conversion timing; 40–60% duty cycle required; max 2MHz |
| CS | Active-low chip select | Enables serial interface; DOUT enters high-impedance state when CS is high |
| DIN | Serial data input | Receives 8-bit control byte on SCLK rising edge; first '1' bit defines MSB start position |
| DOUT | Serial data output | Outputs 10-bit result MSB-first on SCLK falling edge; high-Z when CS high |
| SSTRB | Serial strobe output | Pulses high for one SCLK period before MSB in external mode; goes low at conversion start in internal mode |
| AGND / DGND | Analog and digital ground | Must be connected at single point near device; AGND carries sensitive analog return current |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input mode | Unipolar/bipolar and single-ended/differential selection via control byte bits UNI/BIP and SGL/DIF - eliminates external signal conditioning components |
| Reference-buffer amplifier with ±1.5% adjustment | Allows fine-tuning of VREF gain (2.00 V/V for MAX1249) to compensate for external reference tolerance or PCB trace losses |
| Three-level SHDN pin | Enables system-level power management: full shutdown (1µA), fast wake-up (54µA), or reference compensation control - no external logic needed |
| SPI/QSPI/MICROWIRE/TMS320 compatibility | Direct interface to industry-standard controllers without level shifters or glue logic; CPOL=0, CPHA=0 configuration required |
| Track/hold acquisition time | 1.5µs minimum - supports accurate sampling of signals with source impedances up to 3kΩ without external RC filtering |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure every 10 seconds. IC Role / Device Role / Timing Role: ADC digitizes conditioned analog outputs from MEMS sensors; internal clock mode enables CPU to poll result asynchronously after conversion completes. Use Value: 1µA shutdown current extends CR2032 battery life to >2 years; 10-bit resolution captures sub-degree thermal changes. |
Use Scenario: Handheld ECG monitor acquiring lead-II differential signals at 250Hz with clinical-grade accuracy. IC Role / Device Role / Timing Role: Configured in differential mode (CH0/CH1) with bipolar input range; COM referenced to mid-supply for AC-coupled biopotential signals. Use Value: ±1 LSB INL ensures diagnostic waveform fidelity; 2.25MHz input bandwidth preserves QRS complex rise-time integrity. |
| Battery-Powered Test Equipment | System Supervision |
Use Scenario: Pocket-sized multimeter measuring DC voltage, current, and resistance with auto-ranging. IC Role / Device Role / Timing Role: Multiplexes between shunt resistor, voltage divider, and internal reference paths; unipolar mode used for 0–2.5V measurement range. Use Value: 4-channel integration eliminates external MUX IC; 1.2mA active current enables >8 hours of continuous use on AA cells. |
Use Scenario: Industrial PLC monitoring 4× 4–20mA loop currents and 2× thermocouple inputs for HVAC control. IC Role / Device Role / Timing Role: Digitizes isolated current-loop outputs via precision shunts; software-selectable bipolar mode accommodates negative fault conditions. Use Value: External reference input ensures ratiometric accuracy immune to supply drift; 133ksps supports oversampling for 16-bit effective resolution. |
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 |
|---|---|---|---|
| MAX1248BCEE | Integrated 2.5V reference (±30ppm/°C TC); no external VREF required; REFADJ adjustable; 1.2mA active current identical | Preferred where board space prohibits external reference; less suitable for ratiometric measurements against external sensors | Select MAX1248BCEE when reference stability vs. temperature is critical and external reference sourcing adds cost/complexity |
| ADS7822U | 12-bit resolution; SPI-only interface; 200ksps; 2.7–5.25V supply; internal reference only; no SHDN pin | Lacks shutdown control and flexible input configuration; higher resolution but lower sampling flexibility | Choose ADS7822U only when 12-bit precision outweighs need for power gating, bipolar mode, or differential channel pairing |
Compared with MAX1249BCEE, MAX1248BCEE simplifies BOM by integrating the reference but sacrifices ratiometric accuracy, while ADS7822U trades configurability and ultra-low-power shutdown for higher resolution-making MAX1249BCEE optimal for battery-constrained, multi-sensor systems requiring precise external referencing.
Availability
MAX1249BCEE is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-powered test equipment requiring stable component supply across extended production lifecycles.
Supply support for MAX1249BCEE 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 MAX1248/MAX1249 product line delivers low-power, multi-channel serial ADCs optimized for battery-operated instrumentation where size, power, and configurable analog front-end flexibility are critical.
FAQ
What is the reference requirement for MAX1249BCEE?
The MAX1249BCEE requires an external 2.500V reference applied to the VREF pin. Unlike the MAX1248, it does not include an internal reference. The reference must be stable within ±0.030V and sourced from a low-impedance (<18kΩ) supply; REFADJ must be tied to VDD to disable the internal buffer. This design enables ratiometric accuracy when measuring sensors referenced to the same external VREF.
How does the SHDN pin function on MAX1249BCEE?
The SHDN pin on MAX1249BCEE provides three distinct operating states: pulled low → full power-down (1µA supply current); pulled high → internal reference compensation mode; left floating → external compensation mode for REFADJ adjustment. This eliminates need for external logic to manage sleep/wake cycles or reference tuning, directly supporting energy-efficient portable system architectures.
Can MAX1249BCEE perform differential measurements?
Yes, MAX1249BCEE supports pseudo-differential measurements using CH0/CH1 or CH2/CH3 pairs. In differential mode (SGL/DIF = 0), the device samples the voltage difference |IN+ − IN−|, with IN− held stable to ±0.5LSB. For best results, connect a 0.1µF capacitor from the selected IN− channel to AGND. This capability enables noise-rejecting measurements of bridge sensors or biopotential signals without external instrumentation amplifiers.
What is the maximum recommended source impedance for analog inputs on MAX1249BCEE?
The MAX1249BCEE specifies a maximum source impedance of 3kΩ for optimal AC performance without external filtering. If higher impedances are unavoidable, a 0.01µF capacitor should be placed at each analog input to limit bandwidth and ensure proper acquisition within the 1.5µs tACQ window. Exceeding this without compensation risks gain error and reduced SINAD due to incomplete settling on the internal hold capacitor.
Which microcontroller interfaces are natively supported by MAX1249BCEE?
MAX1249BCEE natively supports SPI, QSPI, and MICROWIRE protocols via its 4-wire serial interface (SCLK, DIN, DOUT, CS). It also provides direct TMS320-family DSP connectivity through the SSTRB strobe output. Configuration requires CPOL = 0 and CPHA = 0; no level shifters or protocol translation logic are needed, enabling plug-and-play integration with ARM Cortex-M, Renesas RL78, and TI MSP430 microcontrollers.
MAX1249BCEE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1249BCEE FAQ
1.How can I place an order for MAX1249BCEE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1249BCEE 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 MAX1249BCEE reliable?
The price and inventory of MAX1249BCEE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1249BCEE is usually 5 days.
3.What payment methods are accepted for MAX1249BCEE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1249BCEE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1249BCEE?
MAX1249BCEE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1249BCEE 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 MAX1249BCEE?
For technical support, including MAX1249BCEE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1249BCEE requirements.
6.How does Aetrix verify that MAX1249BCEE is sourced from the original manufacturer or authorized distributors?
All MAX1249BCEE 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 MAX1249BCEE meets industry standards.
7.What is the process for return or replacement of MAX1249BCEE?
All MAX1249BCEE units undergo pre-shipment inspection (PSI). If there is an issue with MAX1249BCEE, 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 MAX1249BCEE part is unused and in its original packaging.
Return procedure for MAX1249BCEE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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