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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:115
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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 high-precision data acquisition in battery-powered medical instruments and portable data loggers.
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-value per application, and two confirmed alternative parts with documented functional and application-level differences - all grounded in Maxim's official Rev 5 datasheet (19-0464).
Technical Context
The MAX149BEAP+ uses successive-approximation register (SAR) 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 topology - eight single-ended or four pseudo-differential channels - via an 8-bit control byte written to DIN.
It features dual power-down modes: full power-down (≤1µA) and fast power-down (30–70µA for MAX149), both programmable via PD0/PD1 bits. The internal 2.5V reference (±30ppm/°C TC, ±0.5LSB INL) is buffered and adjustable via REFADJ (±1.5% range), eliminating need for external reference components in most designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output codes for precise quantization of analog sensor or signal sources. |
| Sampling Rate | 133ksps - supports real-time capture of audio-band and industrial control signals without undersampling artifacts. |
| INL (Max) | ±1 LSB - ensures monotonicity and <0.1% full-scale linearity error after calibration, critical for closed-loop feedback accuracy. |
| Supply Current | 1.2mA @ 133ksps / 3V - enables >100-hour operation on a single 3.7V Li-ion cell in intermittent-sampling systems. |
| Reference | Internal 2.500V ±0.030V - eliminates external reference IC and trimming, reducing BOM count and layout area by ~3 components. |
| Interface | SPI/QSPI/MICROWIRE 4-wire - directly connects to STM32, TMS320, or PIC microcontrollers without level shifters or glue logic. |
| Input Range | Unipolar: 0 to VREF; Bipolar: ±VREF/2 - supports both ground-referenced sensors and AC-coupled transducer outputs. |
Pinout & Package
MAX149BEAP+ is housed in a 20-pin SSOP package (body width 5.3mm, pitch 0.65mm), RoHS-compliant and lead(Pb)-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Software-selectable as single-ended (vs. COM) or pseudo-differential pairs (CH0/CH1, CH2/CH3, etc.) - enables flexible sensor multiplexing without external switches. |
| COM (Pin 9) | Analog common reference | Sets zero-code voltage in single-ended mode; must be stable to ±0.5 LSB - requires low-noise local AGND tie or dedicated filter cap. |
| SHDN (Pin 10) | Three-level shutdown control | Pull low → full shutdown (≤1µA); leave floating → external compensation mode; pull high → internal compensation - enables adaptive power management. |
| VREF (Pin 11) | Reference buffer output / ADC reference input | Delivers 2.500V ±0.030V (MAX149 only); bypassed with 4.7µF for stability - replaces external reference IC and decoupling network. |
| REFADJ (Pin 12) | Reference buffer adjustment input | Allows ±1.5% fine-tuning of VREF; tie to VDD to disable buffer - supports calibration trims or alternate reference sourcing. |
| AGND / DGND (Pins 13–14) | Analog and digital ground returns | Must be separated and joined at single point near VDD decoupling - prevents digital noise from modulating ADC quantization. |
| 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 - simplifies timing-critical firmware reads. |
| DIN / CS / SCLK / VDD (Pins 17–20) | Serial command input / chip select / clock / supply | Standard SPI signaling; CS must be held low during full 15-clock conversion cycle - compatible with generic MCU GPIO or hardware SPI peripherals. |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel MUX + track/hold | Reduces external signal conditioning to one op-amp per channel; eliminates need for external sample-hold ICs in multi-sensor systems. |
| Internal 2.5V reference | Removes dependency on external precision reference ICs (e.g., REF5025), cutting BOM cost and PCB area while maintaining ±0.5LSB INL over temperature. |
| Software-configurable inputs | Single control byte selects unipolar/bipolar, single-ended/differential, and channel - enables runtime reconfiguration without hardware changes. |
| Two power-down modes | Full shutdown (≤1µA) extends battery life in sleep intervals; fast shutdown (30–70µA) retains reference bias for <10µs wake-up - ideal for duty-cycled sensing. |
| SPI/QSPI/MICROWIRE compatibility | Direct connection to TI C2000, ST STM32, or Microchip PIC without protocol translation - reduces firmware development time and driver complexity. |
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: Primary ADC acquiring conditioned analog outputs from multiple MEMS sensors via software-reconfigurable single-ended inputs. Use Value: 1.2mA active current and ≤1µA shutdown enable >1-year operation on CR2032; internal reference removes need for external 2.5V source, shrinking footprint by 25%. |
Use Scenario: Handheld ECG monitor digitizing differential lead signals with low noise and high CMRR. IC Role / Device Role / Timing Role: Pseudo-differential ADC converting CH0/CH1 and CH2/CH3 pairs to capture lead I and II waveforms at 1ksps. Use Value: ±1 LSB INL and 66dB SINAD ensure diagnostic-grade waveform fidelity; COM pin stability requirement guides clean analog partitioning. |
| Battery-Powered Test Equipment | Industrial Process Monitoring |
|
Use Scenario: Pocket-sized multimeter measuring DC voltage, current, and resistance with autoranging. IC Role / Device Role / Timing Role: Reconfigurable ADC switching between unipolar (voltage) and bipolar (current shunt) modes using same hardware path. Use Value: Software-selectable UNI/BIP and SGL/DIF bits eliminate mechanical range-switching relays - improving reliability and reducing bill-of-materials. |
Use Scenario: PLC analog input module monitoring 4–20mA loop sensors across 8 field points. IC Role / Device Role / Timing Role: High-accuracy ADC interfacing to isolated current-to-voltage converters, with internal reference ensuring channel-to-channel gain matching. Use Value: ±0.05 LSB channel-to-channel offset matching minimizes calibration effort across 8 channels; SSOP package fits dense I/O card layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit, serial, multi-channel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-channel, 12-bit, SPI-only, no internal reference, 200ksps, 2.7–5.25V supply | Higher resolution but requires external 2.5V reference and lacks bipolar input support - increases BOM and firmware complexity. | Select when 12-bit resolution is mandatory and system already includes precision reference; avoid if minimizing component count is priority. |
| MAX11131AUT+ | 8-channel, 12-bit, internal 2.048V reference, SPI/QSPI, 500ksps, 2.7–3.6V supply only | Wider bandwidth and higher resolution, but narrower supply range excludes 5V systems and lacks REFADJ adjustability. | Prefer for 3.3V-only designs needing faster sampling; not suitable for mixed 3.3V/5V systems or where ±1.5% VREF trim is required. |
Compared with ADS7822U and MAX11131AUT+, the MAX149BEAP+ uniquely balances 10-bit precision, internal 2.5V reference with trim capability, full 2.7–5.25V operation, and bipolar input support - making it optimal for cost-sensitive, battery-powered, multi-range instrumentation where reference integration and supply flexibility are critical.
Availability
MAX149BEAP+ 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 (–40°C to +85°C).
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, high-accuracy data acquisition in space- and energy-constrained systems - emphasizing integrated references, flexible input topologies, and minimal external component count.
FAQ
What is the operating temperature range for MAX149BEAP+?
The MAX149BEAP+ is specified for –40°C to +85°C operation (E-grade), matching industrial and portable medical equipment requirements. This is confirmed in the Absolute Maximum Ratings table and Ordering Information section of the datasheet (Rev 5, p.2), where MAX149_E_P denotes the –40°C to +85°C variant. The 'BE' prefix in MAX149BEAP+ explicitly identifies this temperature grade.
Does MAX149BEAP+ require an external reference voltage?
No, MAX149BEAP+ includes an internal 2.500V reference with ±30ppm/°C temperature coefficient and ±0.5LSB integral nonlinearity. The datasheet states "The MAX149 has an internal 2.5V reference" (p.1), and electrical characteristics confirm VREF output voltage of 2.470V to 2.530V at +25°C (p.3). External reference is only needed for MAX148 variants.
How many analog input channels does MAX149BEAP+ support, and what configurations are available?
MAX149BEAP+ supports eight analog input pins (CH0–CH7) configurable as either eight single-ended inputs (referenced to COM) or four pseudo-differential pairs (CH0/CH1, CH2/CH3, CH4/CH5, CH6/CH7). Configuration is controlled via the SGL/DIF and channel-select bits in the 8-bit control byte (Tables 2 and 3, p.10–11), with no hardware changes required.
What power-down modes are available on MAX149BEAP+, and what are their typical currents?
MAX149BEAP+ offers two programmable power-down modes: full power-down (≤1µA) and fast power-down (30–70µA). These are selected via PD1/PD0 bits in the control byte (Table 1, p.10). Full power-down halts all internal circuitry including the reference buffer; fast power-down maintains reference bias for rapid wake-up - both confirmed in the Power Requirements table (p.4).
Is MAX149BEAP+ compatible with standard SPI interfaces, and what clock polarity settings are required?
Yes, MAX149BEAP+ is SPI/QSPI/MICROWIRE-compatible. For SPI mode, the datasheet specifies CPOL = 0 and CPHA = 0 (p.10): data sampled on SCLK rising edge (DIN) and shifted out on falling edge (DOUT), with CS active-low. This matches standard Mode 0 SPI timing, enabling direct connection to STM32, NXP LPC, or Renesas RA series MCUs without protocol translation.
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:
- 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+ 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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