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Analog Devices Inc./Maxim Integrated MAX149BMAP/PR
- Part No.:
- MAX149BMAP/PR
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX149BMAP/PR.pdf
- Description:
- IC ADC 10BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,021
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Product details
Overview
MAX149BMAP/PR 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 MAX149BMAP/PR datasheet, MAX149BMAP/PR pinout, MAX149BMAP/PR application, or MAX149BMAP/PR equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-ready availability details - all grounded in Maxim's official MAX149 datasheet Rev 5 (1/12).
Technical Context
The MAX149BMAP/PR uses 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 software-selectable 8-channel single-ended or 4-channel differential input configurations, with COM pin serving as zero-code reference in single-ended mode.
It integrates a buffered 2.5V internal reference (±30ppm/°C TC, ±0.5LSB INL over temperature), reference-adjust pin (REFADJ) with ±1.5% voltage-adjustment range, and three-level SHDN control supporting full power-down (1µA), fast power-down (30–70µA), and operational modes - all accessible via its 8-bit control byte with START, channel select, UNI/BIP, SGL/DIF, and PD bits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete digital codes for precise quantization of analog sensor or signal voltages. |
| Sampling Rate | 133ksps - enables real-time capture of audio-band and control-loop signals without undersampling artifacts. |
| INL (Max) | ±1 LSB - ensures monotonicity and <0.1% full-scale error after calibration, critical for closed-loop feedback accuracy. |
| Supply Current (Op) | 1.2mA at 3V - allows continuous operation for >100 hours on a standard 3.7V 1000mAh Li-ion cell. |
| Power-Down Current | 1µA - reduces system standby power by >99.9% versus active mode, essential for ultra-low-power wake-on-event designs. |
| Reference | Internal 2.500V ±0.030V - eliminates need for external precision reference IC and associated PCB area/cost. |
| Interface | SPI/QSPI/MICROWIRE 4-wire - directly connects to common microcontroller peripherals without level shifters or glue logic. |
Pinout & Package
MAX149BMAP/PR is housed in a 20-pin SSOP package (body size 7.2mm × 5.3mm, 0.65mm pitch), rated for -55°C to +125°C operating temperature - suitable for harsh industrial and automotive under-hood environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Support software-configurable single-ended (vs. COM) or pseudo-differential (paired CHx/CHy) acquisition; each has ≤16pF input capacitance and ±0.01µA leakage. |
| COM (Pin 9) | Analog ground reference | Sets zero-code voltage in single-ended mode; must be stable to ±0.5 LSB - requires low-noise, dedicated AGND plane routing. |
| 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 output/input | Delivers 2.500V ±0.030V (MAX149 only); requires 4.7µF bypass cap when using internal reference; accepts 1.0V–(VDD+50mV) external reference if buffer disabled. |
| REFADJ (Pin 12) | Reference buffer adjustment | Enables ±1.5% fine-tuning of VREF; tie to VDD to disable internal buffer for external reference use. |
| AGND / DGND (Pins 13–14) | Analog & digital ground returns | Must be separated on PCB and joined at single point near VDD decoupling; AGND-DGND voltage difference limited to ±0.3V per spec. |
| 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 goes low→high during conversion in internal clock mode. |
| DIN / CS / SCLK (Pins 17–19) | Serial interface control | Standard SPI-compatible timing (CPOL=0, CPHA=0); CS must be held low during control byte write and data read; SCLK duty cycle 40–60% in external clock mode. |
| VDD (Pin 20) | Positive supply | Accepts +2.7V to +5.25V; PSR = ±0.3mV across full range - enables direct connection to noisy DC-DC converter outputs. |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel multiplexer + track/hold | Reduces external signal conditioning components; supports channel scanning at 133ksps with ≤1.5μs acquisition time per sample. |
| Software-configurable input modes | Single control byte selects unipolar/bipolar and single-ended/differential operation - eliminates hardware jumpers or configuration resistors. |
| Internal 2.5V reference with REFADJ | Eliminates external reference IC and trim pot; ±1.5% adjustability compensates for board-level voltage drift or tolerance stack-up. |
| Three power-down states | Full (1µA), fast (30–70µA), and auto-shutdown-after-conversion enable adaptive power management in event-driven systems. |
| SPI/QSPI/MICROWIRE/TMS320 compatibility | Direct interface to TI C2000, ST STM32, Microchip PIC, and NXP Kinetis MCUs - no protocol translation firmware required. |
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 digitizes analog sensor outputs with 10-bit resolution and internal reference stability, synchronized to MCU sleep/wake cycles. Use Value: 1.2mA active current and 1µA shutdown extend battery life to >2 years on two AA cells; 20-pin SSOP fits compact PCB layouts. |
Use Scenario: Portable ECG monitor acquiring lead-II differential signals at 1ksps with clinical-grade linearity. IC Role / Device Role / Timing Role: Configured in differential mode (CH0/CH1) with bipolar input range (±1.25V), providing noise-immune biopotential measurement. Use Value: ±1 LSB INL and -70dB THD meet AAMI EC11 requirements; internal reference avoids drift-induced baseline wander. |
| Battery-Powered Test Equipment | Industrial Process Monitoring |
Use Scenario: Handheld multimeter measuring DC voltage, current, and resistance with autoranging and hold function. IC Role / Device Role / Timing Role: Acts as primary data acquisition engine, switching between input ranges via CH0–CH7 mux and scaling via software gain calibration. Use Value: Single-supply +2.7V to +5.25V operation simplifies power design; 133ksps supports fast continuity beep response and AC RMS calculation. |
Use Scenario: DIN-rail mounted PLC analog input module monitoring 4–20mA transmitters and thermocouple signals in factory automation. IC Role / Device Role / Timing Role: Digitizes isolated analog inputs in single-ended mode (CH2–CH7), with COM referenced to isolated AGND plane. Use Value: -55°C to +125°C rating ensures reliability in uncooled enclosures; 2.25MHz small-signal bandwidth supports anti-alias filtering for 50/60Hz noise rejection. |
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; 1µA shutdown; 200ksps max. | Higher resolution but no integrated reference - increases BOM count and layout complexity for precision applications. | Select when 12-bit resolution is mandatory and external reference infrastructure already exists. |
| MAX11131ETE+ | 8-channel, 12-bit, internal 2.048V ref, SPI, 1.8V–3.6V supply only; 1.5µA shutdown; 500ksps. | Narrower supply range excludes 5V systems; lower reference voltage reduces dynamic range for high-VFS signals. | Select for ultra-low-voltage (1.8V) embedded systems where 2.048V reference aligns with existing signal chain. |
Compared with ADS7822U and MAX11131ETE+, the MAX149BMAP/PR uniquely combines 10-bit accuracy, integrated 2.5V reference, wide 2.7V–5.25V supply, and -55°C to +125°C operation - making it optimal for ruggedized, self-contained data acquisition where reference stability and supply flexibility are prioritized over raw bit depth.
Availability
MAX149BMAP/PR is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and industrial process monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX149BMAP/PR 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 systems - emphasizing integrated functionality (mux, T/H, reference, serial interface) to minimize external components and PCB footprint.
FAQ
What is the operating temperature range of the MAX149BMAP/PR?
The MAX149BMAP/PR is specified for -55°C to +125°C operation, as confirmed in the "Operating Temperature Ranges" table of the MAX149 datasheet Rev 5. This extended range supports deployment in automotive under-hood modules, industrial motor drives, and outdoor environmental sensors where ambient temperatures exceed commercial-grade limits. The part maintains ±1 LSB INL and 1.2mA supply current performance across this full range.
Does the MAX149BMAP/PR require an external reference voltage?
No, the MAX149BMAP/PR includes an internal 2.500V reference with ±30ppm/°C temperature coefficient and ±0.5LSB integral nonlinearity - eliminating the need for an external reference IC. The VREF pin delivers this buffered output, and REFADJ allows ±1.5% adjustment. An external reference is only required if the internal reference is disabled by pulling REFADJ to VDD, which is not the default configuration for MAX149BMAP/PR.
How does the SHDN pin function on the MAX149BMAP/PR?
The SHDN pin on the MAX149BMAP/PR provides three distinct operating states: pulling it low enables full power-down (1µA supply current); leaving it unconnected configures the reference-buffer amplifier for external compensation (requiring 4.7µF at VREF); and pulling it high selects internal compensation mode. This three-level control is explicitly defined in the "Pin Description" section of the MAX149 datasheet and enables flexible power management without additional control logic.
What serial interface protocols does the MAX149BMAP/PR support?
The MAX149BMAP/PR supports SPI, QSPI, and MICROWIRE protocols via its 4-wire interface (CS, SCLK, DIN, DOUT), as stated in the "Features" and "General Description" sections. It requires CPOL = 0 and CPHA = 0 timing - matching standard SPI master mode. The SSTRB output also enables direct interfacing with TMS320-family DSPs, and all timing parameters (tDS, tDH, tDO, etc.) are fully characterized for interoperability.
Can the MAX149BMAP/PR perform differential measurements?
Yes, the MAX149BMAP/PR supports true pseudo-differential measurements using four channel pairs: CH0/CH1, CH2/CH3, CH4/CH5, and CH6/CH7. This is configured via the SGL/DIF bit (bit 2) in the 8-bit control byte, with channel selection handled by SEL2–SEL0 bits. In differential mode, the device samples the voltage difference |IN+ − IN−| while maintaining the same 10-bit resolution and ±1 LSB INL performance as single-ended mode.
MAX149BMAP/PR 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:
- -55°C ~ 125°C
- Supplier Device Package:
- 20-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX149BMAP/PR FAQ
1.How can I place an order for MAX149BMAP/PR through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX149BMAP/PR 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 MAX149BMAP/PR reliable?
The price and inventory of MAX149BMAP/PR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX149BMAP/PR is usually 5 days.
3.What payment methods are accepted for MAX149BMAP/PR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX149BMAP/PR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX149BMAP/PR?
MAX149BMAP/PR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX149BMAP/PR 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 MAX149BMAP/PR?
For technical support, including MAX149BMAP/PR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX149BMAP/PR requirements.
6.How does Aetrix verify that MAX149BMAP/PR is sourced from the original manufacturer or authorized distributors?
All MAX149BMAP/PR 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 MAX149BMAP/PR meets industry standards.
7.What is the process for return or replacement of MAX149BMAP/PR?
All MAX149BMAP/PR units undergo pre-shipment inspection (PSI). If there is an issue with MAX149BMAP/PR, 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 MAX149BMAP/PR part is unused and in its original packaging.
Return procedure for MAX149BMAP/PR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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