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Analog Devices Inc./Maxim Integrated MAX149AEAP+
- Part No.:
- MAX149AEAP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- -
- Datasheet:
-
MAX149AEAP+.pdf
- Description:
- IC ADC 10BIT SRL 133K 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,237
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Product details
Overview
MAX149AEAP+ from Maxim Integrated is a low-power, 10-bit serial analog-to-digital converter (ADC) with 8-channel single-ended or 4-channel differential input multiplexer, 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 supply - optimized for portable data logging and battery-powered instrumentation.
For engineers reviewing the MAX149AEAP+ datasheet, MAX149AEAP+ pinout, MAX149AEAP+ application, or MAX149AEAP+ equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The MAX149AEAP+ uses successive-approximation register (SAR) architecture with integrated track/hold circuitry and software-configurable unipolar/bipolar and single-ended/differential input modes. Its internal 2.5V reference (±0.3% initial accuracy, ±30ppm/°C drift) eliminates external reference components, while the reference-buffer amplifier supports ±1.5% voltage adjustment via REFADJ.
It supports dual clock modes: internal clock (1.8MHz typical) for autonomous conversion timing, or external serial clock (up to 2.0MHz) for synchronized system control. The 4-wire serial interface clocks data on SCLK rising edge (DIN) and falling edge (DOUT), with SSTRB providing precise conversion status signaling - compatible with TMS320-family DSPs without glue logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR ADC - delivers 1024 discrete output codes with monotonic transfer function and no missing codes over temperature. |
| Sampling Rate | 133ksps maximum - enables real-time capture of signals up to ~66kHz Nyquist bandwidth in continuous mode. |
| Supply Voltage | +2.7V to +5.25V single supply - supports direct integration into 3V and 5V systems without level-shifting or auxiliary rails. |
| Reference | Internal 2.500V ±0.3% (25°C), ±30ppm/°C - reduces BOM count and layout area; adjustable ±1.5% via REFADJ pin for calibration flexibility. |
| Power Consumption | 1.2mA at 133ksps / 3V; 54µA at 1ksps / 3V; 1µA in full power-down - enables >100-hour battery life in intermittent-sampling instruments. |
| INL Accuracy | ±0.5 LSB (max) - ensures <0.05% full-scale error after gain/offset calibration, critical for medical sensor front-ends. |
| Interface Compatibility | SPI/QSPI/MICROWIRE/TMS320 - interoperates with common microcontroller peripherals without protocol translation or firmware overhead. |
Pinout & Package
MAX149AEAP+ is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm lead pitch, JEDEC MO-153 compliant, RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Software-selectable as 8 single-ended inputs (vs. COM) or 4 differential pairs (CH0/CH1, CH2/CH3, etc.); support ±VREF/2 bipolar range. |
| COM (Pin 9) | Analog ground reference | Zero-code reference for single-ended mode; must be stable to ±0.5 LSB - requires low-noise, low-impedance connection to AGND. |
| SHDN (Pin 10) | Three-level shutdown control | Pull low → full power-down (1µA); leave floating → external compensation mode; pull high → internal compensation mode for VREF stability. |
| VREF (Pin 11) | Reference buffer output / ADC reference input | Delivers 2.500V ±0.3% (MAX149 only); supplies ADC core and can drive external circuits up to 0.2mA load. |
| REFADJ (Pin 12) | Reference buffer gain adjustment | Enables ±1.5% fine-tuning of VREF; tie to VDD to disable internal buffer when using external reference (not applicable to MAX149AEAP+). |
| AGND / DGND (Pins 13, 14) | Analog and digital ground returns | Must be separated at PCB level and joined at single point near VDD decoupling; prevents digital noise from corrupting analog measurements. |
| DOUT / SSTRB (Pins 15, 16) | Serial data output / strobe signal | DOUT outputs MSB-first 10-bit result on SCLK falling edge; SSTRB pulses high before MSB (external clock) or asserts low during conversion (internal clock). |
| DIN / CS / SCLK (Pins 17–19) | Serial command input / chip select / clock | Standard 4-wire SPI interface: DIN accepts 8-bit control byte (channel, mode, clock/power-down); CS enables DOUT tristate; SCLK edges control all timing. |
| VDD (Pin 20) | Positive supply | Accepts +2.7V to +5.25V; requires 0.1µF ceramic decoupling capacitor placed within 5mm of pin to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel MUX with pseudo-differential architecture | Enables flexible signal routing without external multiplexers; differential mode rejects common-mode noise up to 65dB at 65kHz. |
| Internal 2.5V reference with ±1.5% adjustability | Eliminates need for external precision reference IC or resistor network - reduces component count, board area, and calibration complexity. |
| Software-configurable unipolar/bipolar and single-ended/differential inputs | Allows runtime reconfiguration via control byte (no hardware changes), supporting diverse sensor types (e.g., thermocouples, strain gauges, voltage monitors) on same PCB. |
| Two clock modes: internal (1.8MHz) and external (≤2MHz) | Internal mode decouples conversion timing from host processor clock - simplifies firmware and improves EMI robustness in noisy environments. |
| Low-power operation with automatic shutdown | Auto-shutdown after conversion cuts current to ≤1µA; wake-up via serial interface activity - ideal for duty-cycled sensor nodes with µA-level average current budgets. |
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 front-end digitizing conditioned analog outputs from multiple sensors, with automatic power-down between samples. Use Value: 1.2mA active current and 1µA shutdown enable >1-year CR2032 battery life; internal reference ensures consistent measurement accuracy across varying supply voltage. |
Use Scenario: Handheld ECG monitor acquiring lead-II differential signals at 250SPS with real-time display. IC Role / Device Role / Timing Role: Precision analog front-end converting amplified biopotential signals with <0.05% INL and 66dB SINAD performance. Use Value: Pseudo-differential input structure rejects 50/60Hz mains interference; ±0.5 LSB INL meets IEC 60601-2-27 clinical accuracy requirements. |
| Battery-Powered Test Equipment | Industrial Process Monitoring |
|
Use Scenario: Pocket-sized multimeter measuring DC voltage, current, and resistance with autoranging and LCD update every 200ms. IC Role / Device Role / Timing Role: Primary ADC handling multiple input ranges via programmable gain amplifier and channel multiplexing. Use Value: Single-supply operation (+2.7V to +5.25V) allows direct use of Li-ion cell voltage; 133ksps sampling supports fast continuity and diode test modes. |
Use Scenario: DIN-rail mounted PLC analog input module monitoring 4–20mA current loops from pressure transmitters. IC Role / Device Role / Timing Role: Isolated ADC channel digitizing conditioned loop current signals with galvanically isolated serial interface. Use Value: Internal reference stability (±30ppm/°C) ensures <0.1% full-scale drift over -40°C to +85°C operating range; SPI compatibility simplifies FPGA-based isolation barrier design. |
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-channel, 12-bit, SPI interface, no internal reference, requires external 2.5V ref; 200ksps max; 2.7V–5.25V supply. | Higher resolution but lacks integrated reference - increases BOM and layout complexity; better for precision industrial sensing where 12-bit resolution justifies added cost. | Select ADS7822U when 12-bit resolution and higher SNR (70dB) outweigh need for reference integration and lower power (1.5mA vs. 1.2mA). |
| MAX11100ETE+ | 8-channel, 12-bit, internal 2.048V ref, SPI interface, 1MSPS, 2.7V–3.6V supply only; 2.5µA shutdown. | Narrower supply range excludes 5V systems; faster sampling but higher power (2.5mA @ 1MSPS); smaller 16-pin TQFN package. | Select MAX11100ETE+ for space-constrained, 3.3V-only designs requiring >100ksps and 12-bit resolution - not drop-in due to supply and pinout mismatch. |
Compared with ADS7822U and MAX11100ETE+, the MAX149AEAP+ uniquely balances integrated 2.5V reference, wide 2.7V–5.25V supply, ultra-low 1µA shutdown, and proven 133ksps performance - making it optimal for cost-sensitive, battery-operated, mixed-voltage embedded systems where reference simplicity and power efficiency are primary constraints.
Availability
MAX149AEAP+ 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+ 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 MAX148/MAX149 family was designed for low-power, multi-channel data acquisition in space- and energy-constrained systems - emphasizing integrated references, flexible input configurations, and SPI-compatible serial interfaces to reduce system-level design effort.
FAQ
What is the internal reference voltage tolerance and temperature drift of the MAX149AEAP+?
The MAX149AEAP+ features an internal 2.500V reference with ±0.3% initial accuracy at +25°C and ±30ppm/°C temperature coefficient over –40°C to +85°C. This specification is measured and guaranteed per the datasheet's electrical characteristics table, ensuring stable full-scale calibration across operating conditions without external trimming components.
Does the MAX149AEAP+ support differential input mode, and how is it configured?
Yes, the MAX149AEAP+ supports pseudo-differential input mode using four channel pairs: CH0/CH1, CH2/CH3, CH4/CH5, and CH6/CH7. Configuration is performed via the 8-bit control byte written to DIN - setting bit 2 (SGL/DIF) to '0' and bits 6–4 (SEL2–SEL0) to select the pair. The device samples the difference |IN+ − IN−|, with IN− required to remain stable within ±0.5 LSB relative to AGND.
What is the minimum acquisition time required for accurate conversions on the MAX149AEAP+?
The MAX149AEAP+ specifies a minimum acquisition time (tACQ) of 1.5µs, defined as the time needed for the internal track/hold capacitor to settle to within 1/2 LSB. This value assumes source impedance ≤4kΩ; higher impedances require longer acquisition or local 0.01µF bypass capacitors at each input to maintain AC performance and avoid droop-induced errors.
How does the SHDN pin function on the MAX149AEAP+, and what are its three states?
The SHDN pin on the MAX149AEAP+ provides three distinct operating states: pulled low → full power-down (1µA supply current); left unconnected → reference buffer in external compensation mode (4.7µF cap required at VREF); pulled high → reference buffer in internal compensation mode. This three-level control enables flexible power and reference optimization without additional external logic.
Can the MAX149AEAP+ interface directly with a TMS320-series DSP, and what signal is used for synchronization?
Yes, the MAX149AEAP+ supports direct interface with TMS320-family DSPs using its SSTRB (serial strobe) output. In external clock mode, SSTRB pulses high for one SCLK period before the MSB appears on DOUT - providing precise timing alignment for DSP DMA or interrupt-driven data capture without additional synchronization logic.
MAX149AEAP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- -
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- -
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- -
- Mounting Type:
- -
- Grade:
- -
- Qualification:
- -
MAX149AEAP+ FAQ
1.How can I place an order for MAX149AEAP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX149AEAP+ 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+ reliable?
The price and inventory of MAX149AEAP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX149AEAP+ is usually 5 days.
3.What payment methods are accepted for MAX149AEAP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX149AEAP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX149AEAP+?
MAX149AEAP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX149AEAP+ 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+?
For technical support, including MAX149AEAP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX149AEAP+ requirements.
6.How does Aetrix verify that MAX149AEAP+ is sourced from the original manufacturer or authorized distributors?
All MAX149AEAP+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX149AEAP+?
All MAX149AEAP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX149AEAP+, 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+ part is unused and in its original packaging.
Return procedure for MAX149AEAP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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