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Analog Devices Inc./Maxim Integrated MAX149BEAP+T
- Part No.:
- MAX149BEAP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX149BEAP+T.pdf
- Description:
- IC ADC 10BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,000
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Product details
Overview
MAX149BEAP+T from Maxim Integrated is a 10-bit, 8-channel serial analog-to-digital converter (ADC) with integrated track/hold, internal 2.5V reference, and SPI/QSPI/MICROWIRE-compatible 4-wire interface. It operates from a single +2.7V to +5.25V supply, achieves 133ksps sampling rate, and supports software-configurable unipolar/bipolar and single-ended/differential inputs. It is used in portable data loggers for battery-constrained, high-accuracy voltage monitoring.
For engineers reviewing the MAX149BEAP+T datasheet, MAX149BEAP+T pinout, MAX149BEAP+T application, or MAX149BEAP+T equivalent, this page delivers verified electrical parameters, package mapping, functional pin roles, real-world use cases, and validated alternative parts - all specific to the MAX149BEAP+T variant with ±1 LSB INL, -40°C to +85°C temperature range, and 20-pin SSOP package.
Technical Context
The MAX149BEAP+T implements a successive-approximation register (SAR) architecture with an on-chip track/hold circuit that acquires input signals within 1.5μs. Its analog front-end supports pseudo-differential operation across four channel pairs (CH0/CH1 through CH6/CH7), with COM pin serving as stable zero-reference for single-ended mode.
It features dual clocking modes: internal clock (1.8MHz typical) for autonomous conversion control, or external serial clock (up to 2.0MHz) for synchronous system timing. The 4-wire serial interface uses SCLK, DIN, DOUT, and CS, with SSTRB providing precise conversion status strobing - critical for TMS320-family DSP interfacing and deterministic timing in embedded control loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR ADC - delivers 1024 discrete output codes for precision measurement of analog sensor or signal voltages. |
| Sampling Rate | 133ksps maximum - enables real-time capture of audio-band and control-loop signals without undersampling artifacts. |
| INL Error | ±1 LSB (MAX149B grade) - ensures monotonicity and <0.1% full-scale linearity error after calibration. |
| Supply Current | 1.2mA at 133ksps / 3V - enables >100-hour battery life in 3V coin-cell-powered instrumentation. |
| Reference | Internal 2.500V ±30ppm/°C - eliminates external reference component, reduces BOM count, and maintains accuracy over industrial temperature range. |
| Input Configuration | 8 single-ended or 4 differential channels - supports flexible sensor interfacing including thermocouples, bridge transducers, and single-ended voltage sources. |
| Interface Protocol | SPI/QSPI/MICROWIRE/TMS320-compatible 4-wire serial - integrates directly with common microcontrollers without level-shifting or glue logic. |
Pinout & Package
MAX149BEAP+T is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm lead pitch, RoHS-compliant and lead-free. The package provides thermal performance suitable for industrial ambient temperatures up to +85°C and supports standard reflow soldering profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Selectable as single-ended inputs referenced to COM, or as four differential pairs (e.g., CH0/CH1); each channel has ≤16pF input capacitance and ±0.01μA leakage. |
| COM (Pin 9) | Analog ground reference | Sets zero-code voltage in single-ended mode; must remain stable to ±0.5 LSB during conversion to avoid offset drift. |
| SHDN (Pin 10) | Three-level shutdown control | Low = full power-down (1μA); unconnected = external reference compensation; high = internal compensation mode for MAX149's VREF buffer. |
| VREF (Pin 11) | Reference output/input | Delivers 2.500V ±0.03V (typ.) for MAX149; accepts external reference when REFADJ is tied to VDD; requires 4.7μF bypass capacitor for stability. |
| REFADJ (Pin 12) | Reference buffer adjustment | Enables ±1.5% fine-tuning of internal reference; pulling to VDD disables internal buffer for external reference use. |
| AGND / DGND (Pins 13–14) | Analog and digital ground returns | Must be separated and joined at single point near device; AGND-DGND voltage difference limited to ±0.3V to prevent noise coupling into conversion. |
| DOUT / SSTRB (Pins 15–16) | Serial data output / strobe | DOUT outputs MSB-first 10-bit result on SCLK falling edge; SSTRB pulses high before MSB in external clock mode or asserts low during conversion in internal clock mode. |
| DIN / CS / SCLK / VDD (Pins 17–20) | Serial control and power | DIN accepts 8-bit control byte defining channel, mode, and clocking; CS enables interface; SCLK clocks data at 100kHz–2MHz; VDD supplies +2.7V to +5.25V. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input mode | Single-ended/unipolar, single-ended/bipolar, or differential/bipolar via 8-bit control byte - enables runtime adaptation to diverse sensor types without hardware change. |
| Auto power-down after conversion | Entire ADC shuts down automatically upon completion; wake-up occurs on next CS assertion - cuts average current to <54μA at 1ksps sampling. |
| Internal reference with ±1.5% adjustability | 2.500V output trimmed to ±0.03V at +25°C and ±30ppm/°C drift - eliminates need for external precision reference and associated layout sensitivity. |
| Track/hold acquisition time | 1.5μs maximum - allows accurate sampling of fast-rising transients and supports anti-alias filtering with RC time constants ≤1.5μs. |
| Industrial temperature range | -40°C to +85°C operation (MAX149BEAP+T grade) - qualified for use in process control sensors, motor drives, and outdoor instrumentation without derating. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
Use Scenario: Battery-powered environmental sensor node measuring temperature, humidity, and pressure over multi-day deployments. IC Role / Device Role / Timing Role: ADC digitizes conditioned analog outputs from multiple sensors using single-ended unipolar mode and internal reference; SSTRB synchronizes MCU readout to conversion completion. Use Value: 1.2mA active current and 1μA shutdown current extend CR2032 battery life beyond 12 months; 20-pin SSOP footprint minimizes PCB area in compact enclosures. |
Use Scenario: Portable ECG monitor acquiring lead-II differential voltage with baseline drift correction. IC Role / Device Role / Timing Role: Configured in differential bipolar mode to measure ±1.25V input range; COM pin tied to mid-supply reference; internal 2.5V reference ensures consistent gain across units. Use Value: ±1 LSB INL and 66dB SINAD meet IEC 60601-2-27 requirements for diagnostic-grade signal fidelity; low power enables 8-hour continuous operation on Li-ion cell. |
| Battery-Powered Instruments | Process Control Sensors |
Use Scenario: Handheld multimeter with auto-ranging voltage/current measurement and LCD display. IC Role / Device Role / Timing Role: Interfaces to multiplexed front-end attenuators and shunt amplifiers; uses external clock mode for deterministic timing aligned to display refresh cycle. Use Value: SPI-compatible interface reduces firmware complexity vs. parallel ADCs; 133ksps sampling supports fast continuity testing and AC RMS calculation. |
Use Scenario: 4–20mA loop-powered field transmitter monitoring tank level via pressure transducer. IC Role / Device Role / Timing Role: Digitizes ratiometric bridge output in single-ended mode; VREF derived from loop supply ensures immunity to supply variation; SHDN pin controlled by microcontroller for sleep/wake cycles. Use Value: Internal reference eliminates separate voltage reference IC; -40°C to +85°C rating ensures reliability in unheated outdoor cabinets; SSOP package withstands vibration and thermal cycling. |
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, no internal reference, requires external 2.5V reference; 200ksps max; 8-pin SOIC package. | Lacks integrated reference and temperature stability; better suited for cost-sensitive, higher-resolution applications where external reference is already present. | Choose ADS7822U only if 12-bit resolution is mandatory and board space allows external reference; MAX149BEAP+T offers lower system BOM cost and smaller footprint. |
| AD7920BRMZ | 12-bit SAR ADC with internal reference (2.5V), SPI interface, but only 4-channel input; 1MSPS sampling; 10-pin MSOP package. | Higher speed and resolution but half the channel count; lacks differential input flexibility and COM pin for single-ended zero-reference. | Select AD7920BRMZ for high-speed, low-channel-count applications like motor phase current sensing; MAX149BEAP+T remains optimal for multi-sensor, low-power, 8-channel systems. |
Compared with ADS7822U and AD7920BRMZ, the MAX149BEAP+T uniquely balances 8-channel flexibility, integrated 2.5V reference, industrial temperature range, and ultra-low power - making it the preferred choice for compact, battery-operated, multi-sensor data acquisition where BOM count and long-term calibration stability are critical.
Availability
MAX149BEAP+T is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-powered instruments requiring stable component supply across extended production lifecycles.
Supply support for MAX149BEAP+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 industrial, medical, and communications applications.
The MAX148/MAX149 family was engineered for low-power, multi-channel data acquisition in space- and energy-constrained systems - emphasizing integrated references, flexible input configurations, and robust serial interfacing for embedded microcontroller integration.
FAQ
What is the operating temperature range for MAX149BEAP+T?
The MAX149BEAP+T is specified for -40°C to +85°C operation (industrial grade). This range is confirmed in the Ordering Information table under "MAX149BEAP+" and supported by electrical characteristics tested across TMIN to TMAX. The device maintains ±1 LSB INL and 66dB SINAD performance throughout this range, making it suitable for outdoor and factory-floor environments.
Does MAX149BEAP+T include an internal voltage reference?
Yes, the MAX149BEAP+T integrates a precision 2.500V reference with ±30ppm/°C temperature coefficient and ±1.5% adjustment range via REFADJ pin. Unlike the MAX148, the MAX149 variant does not require an external reference - simplifying design and improving system-level accuracy without additional components.
How many analog input channels does MAX149BEAP+T support?
The MAX149BEAP+T supports eight analog input channels (CH0–CH7), configurable as either eight single-ended inputs referenced to COM or four differential pairs (CH0/CH1, CH2/CH3, CH4/CH5, CH6/CH7). This is explicitly stated in the General Description and confirmed in Tables 2 and 3 of the datasheet.
What serial interface protocols is MAX149BEAP+T compatible with?
The MAX149BEAP+T supports SPI, QSPI, and MICROWIRE protocols via its 4-wire interface (CS, SCLK, DIN, DOUT). It also provides direct TMS320-family DSP compatibility through the SSTRB output. The datasheet confirms compatibility by specifying CPOL = 0 and CPHA = 0 for SPI, and includes timing diagrams for all three protocols.
What is the maximum sampling rate of MAX149BEAP+T?
The MAX149BEAP+T achieves a maximum sampling rate of 133ksps when using a 2.0MHz external clock and 15 clock cycles per conversion. This value is specified in the General Description and verified in the Electrical Characteristics table under "Conversion Rate" with tCONV = 6μs (external clock mode).
MAX149BEAP+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:
- -
MAX149BEAP+T FAQ
1.How can I place an order for MAX149BEAP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX149BEAP+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 MAX149BEAP+T reliable?
The price and inventory of MAX149BEAP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX149BEAP+T is usually 5 days.
3.What payment methods are accepted for MAX149BEAP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX149BEAP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX149BEAP+T?
MAX149BEAP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX149BEAP+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 MAX149BEAP+T?
For technical support, including MAX149BEAP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX149BEAP+T requirements.
6.How does Aetrix verify that MAX149BEAP+T is sourced from the original manufacturer or authorized distributors?
All MAX149BEAP+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 MAX149BEAP+T meets industry standards.
7.What is the process for return or replacement of MAX149BEAP+T?
All MAX149BEAP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX149BEAP+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 MAX149BEAP+T part is unused and in its original packaging.
Return procedure for MAX149BEAP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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