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Analog Devices Inc./Maxim Integrated MAX148BEAP+T
- Part No.:
- MAX148BEAP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX148BEAP+T.pdf
- Description:
- IC ADC 10BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,512
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Product details
Overview
MAX148BEAP+T from Maxim Integrated is a 10-bit, 8-channel serial analog-to-digital converter (ADC) with software-configurable unipolar/bipolar and single-ended/differential inputs, operating from a single +2.7V to +5.25V supply, achieving 133ksps conversion rate and consuming only 1.2mA at 3V - used in portable data loggers and battery-powered medical instruments.
For engineers reviewing the MAX148BEAP+T datasheet, MAX148BEAP+T pinout, MAX148BEAP+T application, or MAX148BEAP+T equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives, and supply-chain support for embedded instrumentation designs.
Technical Context
The MAX148BEAP+T implements successive-approximation (SAR) architecture with integrated track/hold, supporting both internal clock mode (1.8MHz typical) and external clock mode (up to 2.0MHz), enabling flexible timing control across microcontroller interfaces. Its analog front-end allows per-conversion configuration of input polarity and topology via an 8-bit SPI-compatible control byte.
It features a reference-buffer amplifier with ±1.5% voltage-adjustment range, requiring external reference (VREF = 2.500V applied), and provides hardware SHDN pin plus software-selectable power-down modes - including full shutdown (<1µA) and fast power-down (not available on MAX148).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete digital codes over full-scale range, sufficient for medium-precision sensor digitization. |
| Sampling Rate | 133ksps - supports real-time capture of signals up to ~66kHz (Nyquist-limited), suitable for ECG and vibration monitoring. |
| INL (Max) | ±1 LSB - ensures monotonicity and <0.1% full-scale linearity error after calibration, critical for closed-loop control feedback. |
| Supply Current (Active) | 1.2mA at 3V - enables >100hr operation on a 120mAh coin cell when sampling at 1ksps (54µA avg). |
| Power-Down Current | 1µA - reduces system standby power in sleep-mode data loggers without external enable circuitry. |
| Input Range | 0 to VREF (unipolar) or ±VREF/2 (bipolar) - accommodates both ground-referenced sensors and AC-coupled transducer outputs. |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible 4-wire - connects directly to STM32, TMS320, or PIC MCUs without level shifters or glue logic. |
Pinout & Package
MAX148BEAP+T is housed in a 20-pin SSOP package (body size 7.2mm × 5.3mm, 0.65mm pitch), RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog Input Channels | Eight single-ended or four differential input pairs; software-selectable via control byte; high-impedance (16pF) with ±0.01µA leakage. |
| COM (Pin 9) | Analog Ground Reference | Sets zero-code voltage in single-ended mode; must be stable to ±0.5 LSB; ties to AGND in most layouts. |
| SHDN (Pin 10) | Three-Level Shutdown Control | Pull low → full shutdown; leave floating → external compensation mode; pull high → internal compensation mode. |
| VREF (Pin 11) | Reference Input / Buffer Output | Accepts external 2.500V reference (buffer disabled); input resistance 18–25kΩ; max input current 150µA. |
| REFADJ (Pin 12) | Reference Buffer Adjustment | Tie to VDD to disable internal buffer; ±10µA input current; ±1.5% VREF adjustment range when enabled. |
| AGND / DGND (Pins 13–14) | Analog & Digital Grounds | Separate return paths required; AGND-DGND voltage difference limited to ±0.3V to prevent INL degradation. |
| DOUT / SSTRB (Pins 15–16) | Serial Data Output / Strobe | DOUT clocks MSB-first on SCLK falling edge; SSTRB pulses before MSB in external mode or indicates conversion status in internal mode. |
| DIN / CS / SCLK (Pins 17–19) | Serial Interface Inputs | Standard SPI timing (CPOL=0, CPHA=0); CS active-low enables interface; DIN accepts 8-bit control byte defining channel, mode, and clocking. |
| VDD (Pin 20) | Positive Supply | +2.7V to +5.25V operation; PSR ±0.3mV over full supply range ensures stable conversion under noisy rail conditions. |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel MUX with pseudo-differential capability | Supports 8 single-ended or 4 true differential inputs (CH0/CH1, CH2/CH3, etc.), reducing external signal conditioning components. |
| Configurable unipolar/bipolar input mode | Single control-bit selection (UNI/BIP) adapts same hardware to pressure sensors (0–5V) or accelerometer outputs (±2.5V). |
| Two clock modes: internal & external | Internal clock (1.8MHz) decouples conversion timing from host MCU clock; external clock (≤2MHz) enables precise synchronization. |
| Low-power shutdown with automatic wake-up | Full shutdown draws <1µA; serial interface activity automatically powers up device, enabling burst-sampling architectures. |
| Reference buffer with adjustable gain | Buffer gain = 2.00 (MAX148); ±1.5% VREF adjustability allows fine-tuning for system-level offset calibration. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and light over weeks. IC Role / Device Role / Timing Role: Primary ADC digitizing multiple analog sensor outputs via multiplexed inputs; configured for unipolar single-ended mode at 1ksps. Use Value: 54µA active current at 1ksps extends battery life; software-configurable inputs eliminate need for external MUX or op-amp reconfiguration. |
Use Scenario: Handheld ECG monitor acquiring lead-II differential signals with low-noise front-end. IC Role / Device Role / Timing Role: Differential ADC sampling CH0/CH1 pair at 133ksps; bipolar mode captures ±2.5V cardiac waveform with 10-bit resolution. Use Value: ±1 LSB INL ensures accurate ST-segment measurement; separate AGND/DGND pins minimize digital noise coupling into analog path. |
| Battery-Powered Test Equipment | Industrial Process Monitoring |
|
Use Scenario: Pocket-sized multimeter measuring DC voltage, current, and resistance using shared analog front-end. IC Role / Device Role / Timing Role: Reconfigurable ADC switching between voltage divider (unipolar), shunt resistor (bipolar), and thermistor (single-ended) inputs. Use Value: Single control byte changes input topology and polarity - no hardware change needed; 1.2mA active current enables >8hr runtime on AA cells. |
Use Scenario: PLC analog input module monitoring 4–20mA current loops and 0–10V sensor outputs in factory automation. IC Role / Device Role / Timing Role: High-accuracy ADC with ±1 LSB INL and 66dB SINAD digitizing conditioned industrial signals in noisy environments. Use Value: 2.25MHz small-signal bandwidth supports anti-alias filtering; ±0.3mV PSR maintains accuracy despite supply ripple from switching power supplies. |
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, 200ksps, requires external reference; no SHDN pin; 3.3V-only supply. | Higher resolution but lacks hardware shutdown and dual-supply flexibility; not suitable for battery voltage scaling below 3.3V. | Select when 12-bit precision outweighs power savings and supply range needs. |
| AD7908BRUZ | 8-channel, 10-bit, 1MSPS, internal reference, 2.7–5.25V supply, SPI-compatible, includes internal oscillator. | Higher speed and integrated reference simplify BOM but consume 3.5mA active current - unsuitable for ultra-low-power logging. | Select when sampling rate >133ksps is required and system can tolerate higher quiescent current. |
Compared with ADS7822U and AD7908BRUZ, MAX148BEAP+T uniquely balances 10-bit accuracy, sub-1µA shutdown, wide supply range, and flexible reference architecture - making it optimal for energy-constrained, multi-sensor embedded systems where BOM cost and layout simplicity are prioritized over raw speed or resolution.
Availability
MAX148BEAP+T is available at Aetrix Electronics and suitable for portable data logging, battery-powered medical devices, and industrial process monitoring requiring stable component supply across long production lifecycles.
Supply support for MAX148BEAP+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 demanding industrial, medical, and communications applications.
The MAX148BEAP+T belongs to Maxim's low-power SAR ADC product line, engineered specifically for battery-operated instrumentation where conversion accuracy, configurability, and micropower operation must coexist.
FAQ
What is the reference configuration requirement for MAX148BEAP+T?
MAX148BEAP+T requires an external 2.500V reference applied to the VREF pin; its internal reference buffer is disabled by default and must remain disabled for proper operation. The REFADJ pin must be tied to VDD to ensure buffer disable, and the reference input resistance is 18–25kΩ with 100–150µA typical input current. This differs from MAX149, which integrates a 2.5V reference.
Does MAX148BEAP+T support differential input mode?
Yes, MAX148BEAP+T supports pseudo-differential input mode by selecting channel pairs (CH0/CH1, CH2/CH3, CH4/CH5, CH6/CH7) via the control byte's SEL bits and setting SGL/DIF = 0. In this mode, the device samples the voltage difference between two inputs, but only the positive input is actively tracked - the negative input must remain stable within ±0.5 LSB relative to AGND during conversion.
What are the power-down modes available on MAX148BEAP+T?
MAX148BEAP+T offers three power-down states: full power-down (<1µA), software-initiated via PD1/PD0 = 00 in the control byte; hardware shutdown via SHDN pin pulled low; and automatic shutdown at end of conversion. Unlike MAX149, it does not support fast power-down mode (PD1/PD0 = 01), which is exclusive to the MAX149 variant.
Can MAX148BEAP+T interface directly with an STM32 microcontroller?
Yes, MAX148BEAP+T is fully compatible with STM32 SPI peripherals when configured for CPOL = 0 and CPHA = 0. It uses standard 4-wire SPI (CS, SCLK, DIN, DOUT) with MSB-first, falling-edge data capture. No level shifting is needed for 3.3V STM32 I/O, and the 2.0MHz maximum SCLK supports high-throughput sampling without custom firmware drivers.
What is the maximum source impedance supported for analog inputs on MAX148BEAP+T?
The MAX148BEAP+T specifies a minimum acquisition time (tACQ) of 1.5µs, calculated as tACQ = 7 × (RS + 9kΩ) × 16pF. For accurate 10-bit results, source impedance (RS) should be ≤4kΩ. Higher impedances (up to ~50kΩ) are usable with a 0.01µF capacitor at each input, though this limits signal bandwidth due to RC filtering - verified in the datasheet's Figure 4 and text on acquisition time.
MAX148BEAP+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
- 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:
- -
MAX148BEAP+T FAQ
1.How can I place an order for MAX148BEAP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX148BEAP+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 MAX148BEAP+T reliable?
The price and inventory of MAX148BEAP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX148BEAP+T is usually 5 days.
3.What payment methods are accepted for MAX148BEAP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX148BEAP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX148BEAP+T?
MAX148BEAP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX148BEAP+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 MAX148BEAP+T?
For technical support, including MAX148BEAP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX148BEAP+T requirements.
6.How does Aetrix verify that MAX148BEAP+T is sourced from the original manufacturer or authorized distributors?
All MAX148BEAP+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 MAX148BEAP+T meets industry standards.
7.What is the process for return or replacement of MAX148BEAP+T?
All MAX148BEAP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX148BEAP+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 MAX148BEAP+T part is unused and in its original packaging.
Return procedure for MAX148BEAP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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