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Analog Devices Inc./Maxim Integrated MAX149AEAP+T
- Part No.:
- MAX149AEAP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX149AEAP+T.pdf
- Description:
- IC ADC 10BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,027
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Product details
Overview
MAX149AEAP+T from Maxim Integrated is a 10-bit, 8-channel serial analog-to-digital converter (ADC) with integrated track/hold, software-configurable unipolar/bipolar and single-ended/differential inputs, internal 2.5V reference, and SPI/QSPI/MICROWIRE-compatible 4-wire interface. It operates from +2.7V to +5.25V, achieves 133ksps sampling rate, and draws only 1.2mA at 3V - enabling high-precision data acquisition in battery-powered medical instruments and portable data loggers.
For engineers reviewing the MAX149AEAP+T datasheet, MAX149AEAP+T pinout, MAX149AEAP+T application, or MAX149AEAP+T equivalent, this page delivers verified technical context, exact pin functions, real-world use-value per application, and two validated alternative parts - all grounded in the official MAX149 datasheet Rev 5 (Jan 2012) and Maxim's package ordering information.
Technical Context
The MAX149AEAP+T implements a successive-approximation register (SAR) ADC architecture with an integrated track/hold circuit, supporting both internal clock mode (1.8MHz typical) and external serial clock mode (up to 2.0MHz). Its analog front-end allows dynamic reconfiguration of input polarity and topology via an 8-bit control byte, enabling on-the-fly selection among eight single-ended or four differential channel pairs.
It features a buffered internal 2.500V ±0.030V reference (±30ppm/°C TC), adjustable via REFADJ ±1.5%, and includes a three-level SHDN pin for full power-down (1µA), fast power-down (30–70µA), or reference-compensation mode selection - all without requiring external components beyond a 4.7µF capacitor on VREF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output codes for precise quantization of analog sensor or signal voltages. |
| Sampling Rate | 133ksps - supports real-time capture of audio-band and industrial control signals without undersampling artifacts. |
| INL (Max) | ±0.5 LSB (MAX149A grade) - ensures end-point calibrated linearity error stays below half an LSB across full temperature range. |
| Supply Current | 1.2mA at 133ksps / 3V - enables >100-hour operation on a 300mAh coin cell when paired with duty-cycled wake-up logic. |
| Reference | Internal 2.500V ±0.030V - eliminates need for external reference IC or trimming, reducing BOM count and layout area. |
| Interface | SPI/QSPI/MICROWIRE 4-wire - directly connects to standard microcontroller peripherals without level shifters or glue logic. |
| Input Range | 0 to VREF (unipolar) or ±VREF/2 (bipolar) - accommodates both ground-referenced sensors and AC-coupled transducer outputs. |
Pinout & Package
MAX149AEAP+T is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm pitch, JEDEC MO-153 compliant, RoHS-compliant and lead(Pb)-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Eight single-ended or four differential input pairs; software-selectable via control byte; input capacitance 16pF limits source impedance to ≤4kΩ for full AC performance. |
| COM (Pin 9) | Analog common reference | Sets zero-code voltage in single-ended mode; must remain stable to ±0.5 LSB; ties to AGND or mid-supply for bipolar operation. |
| SHDN (Pin 10) | Three-level shutdown control | Pull low → full power-down (1µA); pull high → internal reference compensation; leave floating → external compensation (4.7µF required). |
| VREF (Pin 11) | Reference buffer output / ADC reference input | Delivers 2.500V ±0.030V (MAX149 only); short-circuit tolerant to 30mA; requires 4.7µF bypass for stability in internal mode. |
| REFADJ (Pin 12) | Reference buffer adjustment input | Enables ±1.5% fine-tuning of VREF; tie to VDD to disable internal buffer when using external reference. |
| AGND / DGND (Pins 13–14) | Analog and digital ground returns | Must be separated and joined at single point near device; AGND carries sensitive analog return current; DGND handles digital switching noise. |
| DOUT / SSTRB (Pins 15–16) | Serial data output / strobe sync | DOUT clocks MSB-first on SCLK falling edge; SSTRB pulses before MSB in external mode or asserts low during conversion in internal mode. |
| DIN / CS / SCLK / VDD (Pins 17–20) | Serial interface control and supply | Standard SPI timing (CPOL=0, CPHA=0); CS active-low enables interface; VDD accepts 2.7–5.25V with ±0.3V absolute max rating relative to AGND/DGND. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Single-ended (8 ch) or differential (4 ch) mode selected dynamically via control byte - eliminates hardware jumpers or PCB variants. |
| Integrated reference buffer | 2.500V ±0.030V output with ±1.5% adjustability and 30mA short-circuit capability - removes external reference IC and reduces calibration overhead. |
| Low-power adaptive shutdown | Three distinct power states: full shutdown (1µA), fast shutdown (30–70µA), and operational - enables µA-level sleep between conversions in portable systems. |
| Flexible clock architecture | Supports both internal clock (no external timing source needed) and external SCLK up to 2MHz - decouples conversion timing from host processor clock domain. |
| High-accuracy analog front-end | ±0.5 LSB INL (A-grade), 66dB SINAD, -70dB THD - meets requirements for medical ECG front-ends and precision process monitoring. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure over multi-day deployments. IC Role / Device Role / Timing Role: Primary ADC acquiring synchronized multi-channel analog sensor outputs at 1–10ksps with automatic power-down between samples. Use Value: 1.2mA active current and 1µA shutdown enable >1-year operation on AA batteries; internal reference eliminates calibration drift vs. external references. |
Use Scenario: Handheld blood glucose meter requiring accurate, low-noise conversion of electrochemical sensor current. IC Role / Device Role / Timing Role: Precision front-end ADC digitizing amplified transducer output in unipolar 0–2.5V range with <0.5 LSB INL. Use Value: ±0.5 LSB INL and 66dB SINAD ensure clinical-grade accuracy; SSOP package fits compact handheld PCB layouts. |
| Battery-Powered Test Equipment | Industrial Process Monitoring |
|
Use Scenario: Pocket-sized multimeter with dual-slope and SAR hybrid architecture for fast DC voltage/current measurement. IC Role / Device Role / Timing Role: High-speed auxiliary ADC capturing transient events (e.g., switch bounce, pulse width) at 133ksps. Use Value: 133ksps sampling and 2.25MHz small-signal bandwidth support time-domain analysis; SPI interface simplifies MCU firmware integration. |
Use Scenario: DIN-rail mounted PLC analog input module acquiring 4–20mA loop signals from pressure/flow transmitters. IC Role / Device Role / Timing Role: Isolated channel ADC converting conditioned current-loop outputs with bipolar ±2.5V input range. Use Value: Software-selectable bipolar mode and COM-referenced inputs simplify analog conditioning; 20-pin SSOP eases thermal management in dense I/O modules. |
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 | 12-bit resolution, 200ksps, external reference only, no internal track/hold, 8-pin SOIC | Higher resolution but lacks integrated T/H and internal reference - requires external op-amp driver and reference IC. | Choose ADS7822U only if 12-bit resolution is mandatory and board space allows added support components. |
| MAX11100ETE+ | 12-bit, 500ksps, internal reference, SPI interface, 16-pin TQFN, no SHDN pin | Higher speed and resolution, smaller package, but no hardware shutdown control - power management relies solely on software CS toggling. | Prefer MAX11100ETE+ for space-constrained, high-throughput designs where continuous SPI polling replaces hardware shutdown. |
Compared with ADS7822U and MAX11100ETE+, the MAX149AEAP+T uniquely combines A-grade ±0.5 LSB INL, integrated track/hold, internal 2.5V reference, and hardware SHDN in a single 20-pin SSOP - making it optimal for portable, low-maintenance, and calibration-sensitive applications.
Availability
MAX149AEAP+T is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-powered test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX149AEAP+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The MAX149 belongs to Maxim's precision data acquisition product line, designed specifically for low-power, high-accuracy ADC applications in resource-constrained and battery-operated systems where integration, reliability, and minimal external components are critical.
FAQ
What is the maximum sampling rate of the MAX149AEAP+T?
The MAX149AEAP+T achieves a maximum sampling rate of 133ksps when using the internal clock at 1.8MHz or an external SCLK of 2.0MHz. This rate is sustained across the full operating temperature range (0°C to +70°C) and supply range (+2.7V to +5.25V), with conversion time specified at 5.5–7.5µs depending on SHDN state. The MAX149AEAP+T maintains full 10-bit accuracy at this rate per the datasheet's electrical characteristics table.
Does the MAX149AEAP+T require an external reference voltage?
No, the MAX149AEAP+T includes an internal 2.500V ±0.030V reference with ±1.5% adjustability via REFADJ, eliminating the need for an external reference IC. This internal reference is enabled by default and requires only a 4.7µF capacitor on the VREF pin for stability. In contrast, the pin-compatible MAX148AEAP+T requires an external reference, confirming that the "A" suffix and "E" temperature grade in MAX149AEAP+T denote the internal-reference variant.
What package type is used for the MAX149AEAP+T?
The MAX149AEAP+T uses a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm lead pitch, per Maxim's ordering information table which lists "MAX149AEAP+" as the SSOP variant. The "A" grade indicates ±0.5 LSB INL, "E" denotes the 0°C to +70°C temperature range, and "+T" signifies tape-and-reel packaging - all confirmed in the datasheet's Ordering Information section and Pin Configuration diagrams.
How does the SHDN pin function on the MAX149AEAP+T?
The SHDN pin on the MAX149AEAP+T provides three-level control: pulled low → full power-down (1µA supply current); pulled high → internal reference buffer enters internal compensation mode; left unconnected → external compensation mode (requiring 4.7µF on VREF). This behavior is explicitly defined in the Pin Description table and verified in the Typical Operating Characteristics plots for shutdown current vs. temperature and supply voltage.
Is the MAX149AEAP+T compatible with standard SPI interfaces?
Yes, the MAX149AEAP+T is fully compatible with standard SPI interfaces when configured with CPOL = 0 and CPHA = 0 - matching MICROWIRE and QSPI timing. Data is clocked in on SCLK rising edge and out on falling edge, MSB-first, with CS active-low enabling. This compatibility is confirmed in the "Simple Software Interface" section and Figure 20 of the datasheet, which shows direct connection to TMS320-family DSPs and generic microcontrollers without level shifters or protocol translation.
MAX149AEAP+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 133k
- Number of Inputs:
- 4, 8
- 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, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX149AEAP+T FAQ
1.How can I place an order for MAX149AEAP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX149AEAP+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 MAX149AEAP+T reliable?
The price and inventory of MAX149AEAP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX149AEAP+T is usually 5 days.
3.What payment methods are accepted for MAX149AEAP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX149AEAP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX149AEAP+T?
MAX149AEAP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX149AEAP+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 MAX149AEAP+T?
For technical support, including MAX149AEAP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX149AEAP+T requirements.
6.How does Aetrix verify that MAX149AEAP+T is sourced from the original manufacturer or authorized distributors?
All MAX149AEAP+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 MAX149AEAP+T meets industry standards.
7.What is the process for return or replacement of MAX149AEAP+T?
All MAX149AEAP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX149AEAP+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 MAX149AEAP+T part is unused and in its original packaging.
Return procedure for MAX149AEAP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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