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Analog Devices Inc./Maxim Integrated MAX149BEAP
- Part No.:
- MAX149BEAP
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX149BEAP.pdf
- Description:
- IC ADC 10BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,444
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Product details
Overview
MAX149BEAP 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 portable data logging and battery-powered medical instrumentation.
For engineers reviewing the MAX149BEAP datasheet, MAX149BEAP pinout, MAX149BEAP application, or MAX149BEAP equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in low-power embedded sensing, and validated alternative parts for design continuity and supply resilience.
Technical Context
The MAX149BEAP implements successive-approximation (SAR) architecture with an internal track/hold circuit that acquires input signals in ≤1.5μs and supports both internal clock (1.8MHz typical) and external clock (up to 2.0MHz) conversion modes. Its analog front-end allows flexible configuration: 8 single-ended or 4 pseudo-differential input pairs (CH0/CH1 through CH6/CH7), with COM pin serving as zero-reference in single-ended mode.
Digital control is handled via an 8-bit command byte defining channel selection (SEL2–SEL0), unipolar/bipolar mode (UNI/BIP), input type (SGL/DIF), and power/clock mode (PD1/PD0). The device features three-level SHDN control (low = full shutdown, high = internal compensation, floating = external compensation) and a reference-buffer amplifier with ±1.5% adjustment range at REFADJ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output codes for precision measurement of analog sensor or signal sources. |
| Sampling Rate | 133ksps - supports real-time acquisition of audio-band and process-control signals without undersampling artifacts. |
| Supply Voltage | +2.7V to +5.25V - enables direct operation from Li-ion, 3.3V, or 5V rails without LDO overhead. |
| Internal Reference | 2.500V ±0.030V (±30ppm/°C) - eliminates need for external voltage reference in space-constrained designs. |
| Power Consumption | 1.2mA at 133ksps / 54µA at 1ksps / 1µA in power-down - extends battery life in portable instruments. |
| INL Accuracy | ±0.5 LSB (MAX149B grade) - ensures <0.05% full-scale linearity error after calibration, critical for medical-grade measurements. |
| Serial Interface | SPI/QSPI/MICROWIRE/TMS320-compatible 4-wire - connects directly to common microcontrollers without level shifters or glue logic. |
Pinout & Package
MAX149BEAP is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm pitch, footprint-compatible with industry-standard 20-lead SSOP layouts and suitable for automated SMT assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog Input Channels | Selectable as 8 single-ended inputs or 4 differential pairs; each supports ±VREF/2 bipolar or 0–VREF unipolar ranges. |
| COM (Pin 9) | Analog Common Reference | Sets zero-code voltage in single-ended mode; must be stable to ±0.5 LSB for INL compliance. |
| SHDN (Pin 10) | Three-Level Shutdown Control | Pulled low → full shutdown; pulled high → internal compensation; floating → external compensation (4.7µF at VREF). |
| VREF (Pin 11) | Reference Output/Input | Delivers 2.500V (MAX149) or accepts external reference; buffered output drives ADC core and external loads ≤0.2mA. |
| REFADJ (Pin 12) | Reference Buffer Adjustment | Enables ±1.5% fine-tuning of VREF; tie to VDD to disable buffer in MAX148-mode configurations. |
| AGND / DGND (Pins 13–14) | Analog & Digital Grounds | Separate ground pins minimize digital noise coupling into analog conversion path; require star grounding at PCB level. |
| DOUT / SSTRB (Pins 15–16) | Serial Data Output / Strobe | DOUT outputs MSB-first 10-bit result on SCLK falling edge; SSTRB pulses before MSB (external clock) or asserts low during conversion (internal clock). |
| DIN / CS / SCLK (Pins 17–19) | Serial Command Interface | Standard SPI-compatible inputs: DIN latches control byte on SCLK rising edge; CS enables DOUT/SSTRB; SCLK clocks all data transfers. |
| VDD (Pin 20) | Positive Supply | Accepts +2.7V to +5.25V; powers analog and digital sections; PSR of ±0.3mV ensures stable conversion across rail variation. |
Key Features
| Feature | Design Value |
|---|---|
| Software-Configurable Input Modes | Runtime-selectable unipolar/bipolar and single-ended/differential operation via 8-bit control byte - eliminates hardware jumpers and simplifies firmware-driven sensor interfacing. |
| Integrated 2.5V Reference | On-chip reference with ±30ppm/°C drift and ±1.5% adjustability - reduces BOM count and layout area vs. discrete reference ICs. |
| Low-Power Adaptive Operation | 1.2mA active, 54µA at 1ksps, and 1µA shutdown - enables duty-cycled sensing in battery-powered devices without sacrificing resolution. |
| Flexible Clock Architecture | Supports internal clock (no external timing source required) or external clock (2MHz max) - decouples conversion timing from host processor clock domain. |
| Robust Analog Input Protection | Clamp diodes allow −0.3V to VDD+0.3V input swing; accurate conversion guaranteed within AGND+50mV to VDD−50mV - simplifies front-end filtering design. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
Use Scenario: Battery-operated environmental sensor node recording temperature, humidity, and pressure over multi-day intervals. IC Role / Device Role / Timing Role: Primary ADC acquiring 8 analog sensor outputs sequentially at 1–10ksps, managed by ultra-low-power MCU. Use Value: 1.2mA active current and 1µA shutdown enable >1-year battery life; internal reference eliminates calibration drift between sensors. |
Use Scenario: Handheld ECG or pulse oximeter requiring precise, low-noise analog front-end digitization. IC Role / Device Role / Timing Role: Signal-chain ADC converting conditioned biopotential signals with <0.05% linearity and minimal thermal drift. Use Value: ±0.5 LSB INL and 66dB SINAD ensure diagnostic-grade accuracy; separate AGND/DGND pins suppress digital switching noise. |
| Battery-Powered Test Equipment | Industrial Process Monitoring |
Use Scenario: Field-deployable multimeter or data acquisition module powered by AA batteries. IC Role / Device Role / Timing Role: High-fidelity ADC supporting dual-range measurements (voltage/current/resistance) with auto-ranging firmware. Use Value: Software-configurable unipolar/bipolar and single-ended/differential modes eliminate external multiplexers; 2.25MHz small-signal bandwidth captures transient events. |
Use Scenario: PLC analog input module monitoring 4–20mA transmitters and thermocouple signals in factory automation. IC Role / Device Role / Timing Role: Isolated channel ADC digitizing multiple industrial sensors with programmable gain and offset compensation. Use Value: Channel-to-channel crosstalk <−75dB and 65kHz rejection prevent interference between adjacent channels; robust input protection handles field wiring transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit SAR 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; 1.25µs conversion time. | Higher resolution but lacks integrated reference and shutdown flexibility; needs additional ref IC and layout space. | Choose when 12-bit resolution is mandatory and board area permits external reference; not drop-in due to different pinout and missing SHDN/REFADJ. |
| MAX11131ETE+ | 8-channel, 12-bit, internal 2.048V ref, 1MSPS, SPI, 2.7–3.6V supply only; no bipolar mode support. | Higher speed and resolution but narrower supply range and no software-selectable bipolar input - limits use in 5V systems or AC-coupled signal chains. | Prefer for high-speed, single-supply 3.3V designs where bipolar input is unnecessary; incompatible pinout and command structure precludes PCB reuse. |
Compared with ADS7822U and MAX11131ETE+, the MAX149BEAP uniquely combines 10-bit precision, internal 2.5V reference, bipolar/single-ended configurability, wide 2.7–5.25V supply, and three-level shutdown - making it optimal for compact, battery-aware, multi-range analog acquisition where layout area and supply flexibility are constrained.
Availability
MAX149BEAP 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 MAX149BEAP 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 product line was designed for low-power, multi-channel data acquisition in space- and energy-constrained embedded systems - emphasizing integration, configurability, and supply-voltage flexibility without sacrificing DC accuracy or dynamic performance.
FAQ
What is the operating temperature range for the MAX149BEAP?
The MAX149BEAP is specified for operation from −40°C to +85°C (industrial grade), matching the MAX149_E_P ordering option. This range supports deployment in harsh environments such as factory floors, outdoor instrumentation, and automotive cabin modules - unlike the commercial-grade MAX149_C_P (0°C to +70°C). The MAX149BEAP's ±30ppm/°C reference drift and guaranteed ±0.5 LSB INL hold across this full range.
Does the MAX149BEAP require an external crystal or clock source?
No, the MAX149BEAP does not require an external crystal. It supports two clock modes: internal clock (1.8MHz typical, enabled by PD1/PD0 = 10) and external serial clock (100kHz–2.0MHz, PD1/PD0 = 11). In internal clock mode, the MAX149BEAP generates its own conversion timing - eliminating external timing components and reducing system BOM cost and board area.
How is the internal 2.5V reference adjusted on the MAX149BEAP?
The internal 2.5V reference of the MAX149BEAP is adjusted via the REFADJ pin (Pin 12), which provides ±1.5% fine-tuning range around 2.500V. A voltage applied to REFADJ modulates the reference-buffer amplifier gain; the MAX149BEAP's datasheet specifies ±1.5% adjustment with no external components required. For fixed 2.500V operation, leave REFADJ unconnected or tie to AGND per layout best practices.
Can the MAX149BEAP perform differential measurements?
Yes, the MAX149BEAP supports pseudo-differential measurements using four dedicated channel pairs: CH0/CH1, CH2/CH3, CH4/CH5, and CH6/CH7. In differential mode (SGL/DIF = 0), the device samples the voltage difference |IN+ − IN−|, with IN− held stable to ±0.5 LSB relative to AGND. This mode is configured via bits SEL2–SEL0 and SGL/DIF in the 8-bit control byte - no hardware changes needed.
What package type is used for the MAX149BEAP?
The MAX149BEAP uses a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm lead pitch. This surface-mount package measures 7.2mm × 5.3mm and is RoHS-compliant (+ suffix). It is pin-compatible with other MAX148/MAX149 variants in SSOP (e.g., MAX148ACAP+, MAX149BCAP+) but not with the 20-pin PDIP versions - requiring distinct PCB footprints.
MAX149BEAP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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 FAQ
1.How can I place an order for MAX149BEAP through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX149BEAP 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 reliable?
The price and inventory of MAX149BEAP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX149BEAP is usually 5 days.
3.What payment methods are accepted for MAX149BEAP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX149BEAP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX149BEAP?
MAX149BEAP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX149BEAP 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?
For technical support, including MAX149BEAP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX149BEAP requirements.
6.How does Aetrix verify that MAX149BEAP is sourced from the original manufacturer or authorized distributors?
All MAX149BEAP 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 meets industry standards.
7.What is the process for return or replacement of MAX149BEAP?
All MAX149BEAP units undergo pre-shipment inspection (PSI). If there is an issue with MAX149BEAP, 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 part is unused and in its original packaging.
Return procedure for MAX149BEAP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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