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Analog Devices Inc./Maxim Integrated MAX1249BCEE+T
- Part No.:
- MAX1249BCEE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1249BCEE+T.pdf
- Description:
- IC ADC 10BIT SAR 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,702
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Product details
Overview
MAX1249BCEE+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 serial interface. It operates from a single +2.7V to +5.25V supply, draws 54µA at 1ksps, 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 signal digitization.
For engineers reviewing the MAX1249BCEE+T datasheet, MAX1249BCEE+T pinout, MAX1249BCEE+T application, or MAX1249BCEE+T 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 support details for production deployment.
Technical Context
The MAX1249BCEE+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 provides 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 with no missing codes over temperature. |
| Sampling Rate | 133ksps - supports real-time acquisition of signals up to 65kHz full-power bandwidth. |
| INL (Relative Accuracy) | ±1 LSB - ensures end-point calibrated linearity error stays within ±0.1% of full scale. |
| Supply Current | 54µA at 1ksps - enables multi-hour operation on coin-cell batteries in portable instrumentation. |
| Reference Input | External 2.500V at VREF pin - eliminates need for internal reference buffer, reducing noise and drift sensitivity. |
| Input Configuration | Software-selectable unipolar (0V to VREF) or bipolar (±VREF/2) - simplifies sensor interface across diverse signal ranges. |
| Serial Interface | SPI/QSPI/MICROWIRE/TMS320-compatible 4-wire - enables direct connection to microcontrollers without level shifters or glue logic. |
Pinout & Package
MAX1249BCEE+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 |
|---|---|---|
| 1, SHDN | Three-level shutdown control | Pulling low enables full power-down (≤1µA); floating configures external reference compensation; high enables internal compensation. |
| 2–5, CH0–CH3 | Analog input channels | Support 4 single-ended or 2 differential (CH0/CH1, CH2/CH3) configurations; input voltage range: 0 to VREF (unipolar) or ±VREF/2 (bipolar). |
| 6, COM | Analog ground reference | Sets zero-code voltage in single-ended mode; must remain stable to ±0.5LSB during conversion. |
| 8, VREF | External reference input | Accepts 2.500V ±0.030V reference; internal buffer disabled when REFADJ tied to VDD per datasheet Figure 4. |
| 9, REFADJ | Reference buffer control | Tie to VDD to disable internal reference buffer; otherwise enables ±1.5% VREF adjustment range via external resistor divider. |
| 11, DGND | Digital ground return | Must be isolated from AGND except at single point to minimize digital noise coupling into analog path. |
| 12, DOUT | Serial data output | MSB-first, clocked on SCLK falling edge; high-impedance when CS = high; compatible with 3.3V/5V logic. |
| 14, DIN | Serial data input | Accepts 8-bit control byte (START, SEL2–SEL0, UNI/BIP, SGL/DIF, PD1/PD0); clocked on SCLK rising edge. |
| 15, CS | Active-low chip select | Enables serial interface; DOUT enters high-Z state when CS = high; required before each conversion sequence. |
| 16, SCLK | Serial clock input | Drives data transfer and (in external clock mode) controls SAR conversion timing; 100kHz–2MHz compatible. |
Key Features
| Feature | Design Value |
|---|---|
| Low-power operation | 54µA at 1ksps and 1µA in power-down - extends battery life in portable data loggers and pen digitizers. |
| Flexible input configuration | Software-selectable unipolar/bipolar and single-ended/differential modes - eliminates external signal conditioning for diverse sensors. |
| Reference flexibility | External 2.500V reference input with ±1.5% adjustability - allows precision calibration and compatibility with system-level reference sources. |
| Fast acquisition time | ≤1.5µs track/hold acquisition - supports accurate sampling of fast transients without external sample-hold circuits. |
| Robust digital interface | SPI/QSPI/MICROWIRE/TMS320 compatibility with no external logic - reduces BOM count and PCB layout complexity. |
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 low quiescent current to maximize runtime. Use Value: 54µA operating current at 1ksps enables >1-year operation on CR2032; software-configurable inputs simplify multi-sensor integration. |
Use Scenario: Handheld ECG monitor acquiring biopotential signals from dry electrodes. IC Role / Device Role / Timing Role: Digitizes differential electrode pairs (CH0/CH1, CH2/CH3) in bipolar mode with <±1 LSB INL for clinical-grade accuracy. Use Value: Pseudo-differential architecture rejects common-mode noise; 65kHz full-power bandwidth captures QRS complex fidelity. |
| 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: Configured for unipolar single-ended inputs to digitize scaled front-end amplifier outputs. Use Value: Single +3V supply operation eliminates dual-rail regulators; 10-bit resolution meets Class II handheld meter requirements per IEC 61010. |
Use Scenario: Industrial PLC module monitoring rail voltages, temperature, and fan tachometer signals. IC Role / Device Role / Timing Role: Multiplexes 4 analog supervision channels (VDD, VBAT, thermistor, tach) with automatic channel sequencing. Use Value: Built-in 4-channel MUX reduces external analog switches; SHDN pin enables dynamic power gating during idle cycles. |
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+T | Integrated 2.5V reference (±30ppm/°C), no external VREF required; identical pinout and interface. | Preferred where board space prohibits external reference circuitry; higher reference drift vs. precision external source. | Select MAX1248BCEE+T when reference simplicity outweighs drift tolerance; MAX1249BCEE+T when system-level reference stability is critical. |
| ADS7822U | 12-bit resolution, 200ksps, SPI-only interface, no SHDN pin, 6-pin SOT-23 package. | Higher resolution for precision measurement; lacks multiplexer and shutdown control; unsuitable for multi-channel or ultra-low-power use. | Choose ADS7822U only for single-channel, high-resolution applications where size and speed supersede power and channel count. |
Compared with MAX1248BCEE+T, MAX1249BCEE+T trades integrated reference for superior reference stability and lower noise floor; compared with ADS7822U, it offers 4-channel MUX, programmable shutdown, and lower 1ksps current (54µA vs. 120µA), making it optimal for battery-powered multi-sensor systems.
Availability
MAX1249BCEE+T 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+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 MAX1248/MAX1249 product line targets low-power, multi-channel data acquisition in space- and energy-constrained systems, emphasizing software configurability, minimal external components, and robust serial interfacing.
FAQ
What is the reference requirement for MAX1249BCEE+T?
The MAX1249BCEE+T requires an external 2.500V reference applied to the VREF pin. Unlike the MAX1248 variant, it does not include an internal reference. The reference must be stable within ±0.030V (±1.2%) and capable of sourcing up to 150µA. Reference buffer is disabled by tying REFADJ to VDD, as specified in the MAX1249BCEE+T datasheet Section "EXTERNAL REFERENCE AT VREF".
Does MAX1249BCEE+T support differential input mode?
Yes, MAX1249BCEE+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 pair while maintaining COM as a stable reference point. The input must remain stable to ±0.5LSB on the negative side during conversion, typically achieved with a 0.1µF capacitor to AGND, per the MAX1249BCEE+T Pin Description and Detailed Description sections.
What is the minimum acquisition time for MAX1249BCEE+T?
The guaranteed maximum acquisition time (tACQ) for MAX1249BCEE+T is 1.5µs, measured from the falling SCLK edge after the eighth control bit. This value assumes source impedance ≤3kΩ; higher impedances increase tACQ per the formula tACQ = 7.6 × (RS + 9kΩ) × 16pF. The 1.5µs minimum ensures full settling of the internal track/hold capacitor CHOLD before conversion begins, as confirmed in the Electrical Characteristics table and Timing Characteristics section.
How does the SHDN pin function on MAX1249BCEE+T?
The SHDN pin on MAX1249BCEE+T provides three-level control: pulled low → full shutdown (≤1µA); pulled high → internal compensation mode for reference buffer; left floating → external compensation mode. This enables flexible power management-e.g., full shutdown between measurements in data loggers, or dynamic buffer configuration depending on reference source. The behavior is explicitly defined in the Pin Description table and General Description section of the MAX1249BCEE+T datasheet.
Is MAX1249BCEE+T compatible with standard SPI interfaces?
Yes, MAX1249BCEE+T is fully compatible with standard SPI interfaces when configured with CPOL = 0 and CPHA = 0. It uses MOSI for DIN, MISO for DOUT, SCLK for serial clock, and CS for chip select. Data is clocked in on SCLK rising edge and out on falling edge, MSB-first, with no additional framing overhead. This compatibility is confirmed in the General Description, Features list, and Detailed Description sections of the MAX1249BCEE+T datasheet.
MAX1249BCEE+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:
- 0°C ~ 70°C
- Supplier Device Package:
- 16-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1249BCEE+T FAQ
1.How can I place an order for MAX1249BCEE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1249BCEE+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 MAX1249BCEE+T reliable?
The price and inventory of MAX1249BCEE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1249BCEE+T is usually 5 days.
3.What payment methods are accepted for MAX1249BCEE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1249BCEE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1249BCEE+T?
MAX1249BCEE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1249BCEE+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 MAX1249BCEE+T?
For technical support, including MAX1249BCEE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1249BCEE+T requirements.
6.How does Aetrix verify that MAX1249BCEE+T is sourced from the original manufacturer or authorized distributors?
All MAX1249BCEE+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 MAX1249BCEE+T meets industry standards.
7.What is the process for return or replacement of MAX1249BCEE+T?
All MAX1249BCEE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1249BCEE+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 MAX1249BCEE+T part is unused and in its original packaging.
Return procedure for MAX1249BCEE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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