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Analog Devices Inc./Maxim Integrated MAX148BEAP+
- Part No.:
- MAX148BEAP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX148BEAP+.pdf
- Description:
- IC ADC 10BIT SERIAL 20-SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,537
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Product details
Overview
MAX148BEAP+ 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 sampling rate and 1.2mA supply current at 3V, used in portable data loggers and battery-powered medical instruments.
For engineers reviewing the MAX148BEAP+ datasheet, MAX148BEAP+ pinout, MAX148BEAP+ application, or MAX148BEAP+ equivalent, this page delivers verified technical context, real-world timing behavior, reference-buffer configuration options, and validated alternative ADCs for low-power, multi-channel acquisition systems.
Technical Context
The MAX148BEAP+ employs a successive-approximation register (SAR) architecture with integrated track/hold circuitry, supporting both internal clock mode (1.8MHz typical) and external serial clock mode (up to 2.0MHz). Its analog front-end allows flexible input mapping via an 8-channel multiplexer with COM-referenced single-ended or pseudo-differential operation across CH0–CH7.
It features a reference-buffer amplifier with ±1.5% voltage-adjustment range via REFADJ, requiring external reference (VREF = 2.500V), and supports SPI/QSPI/MICROWIRE-compatible 4-wire serial interface with SSTRB strobe output for TMS320-family DSP synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR ADC - delivers 1024 discrete digital codes over full-scale range. |
| Sampling Rate | 133ksps maximum - enables real-time capture of signals up to ~66kHz Nyquist bandwidth. |
| INL (Max) | ±1 LSB - ensures monotonicity and ≤0.1% full-scale linearity error across temperature. |
| Supply Current | 1.2mA at 133ksps/3V - enables >8-hour runtime on a 10mAh coin cell in continuous acquisition. |
| Power-Down Current | 1µA - reduces system standby power by >99.9% versus active mode. |
| Input Range | 0 to VREF (unipolar) or ±VREF/2 (bipolar) - supports direct interfacing to sensors with offset or AC-coupled outputs. |
| Reference Type | External reference required (VREF = 2.500V) - allows precision matching to system-level voltage references. |
Pinout & Package
MAX148BEAP+ 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 | Software-selectable as single-ended (vs. COM) or differential pairs (CH0/CH1, etc.) - enables 8:1 mux flexibility without external switching. |
| COM (Pin 9) | Analog ground reference | Sets zero-code voltage in single-ended mode; must be stable to ±0.5 LSB - requires low-noise local AGND tie. |
| SHDN (Pin 10) | Three-level shutdown control | Pull low for full power-down; leave floating for external compensation mode - enables reference-buffer tuning without extra pins. |
| VREF (Pin 11) | Reference buffer output / ADC reference input | Accepts 2.500V external reference; buffer gain = 2.00 - eliminates need for external op-amp scaling. |
| REFADJ (Pin 12) | Reference buffer adjustment input | Tie to VDD to disable buffer; otherwise enables ±1.5% fine-tuning - supports calibration of system-level reference drift. |
| DOUT / SSTRB / DIN / SCLK / CS (Pins 15–19) | 4-wire serial interface | Direct SPI/QSPI/MICROWIRE compatibility - no level shifters or glue logic needed for microcontroller integration. |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel single-ended or 4-channel differential input | Reduces external signal conditioning components by enabling on-chip channel selection and polarity configuration. |
| Single-supply +2.7V to +5.25V operation | Eliminates dual-rail supplies in portable designs - compatible with Li-ion, 3.3V, and 5V system rails. |
| 1.2mA active current at 133ksps (3V) | Enables high-speed acquisition in energy-constrained applications without thermal derating or forced sleep cycles. |
| Software-configurable unipolar/bipolar mode | Supports seamless transition between sensor types (e.g., thermocouples vs. pressure transducers) via register write only. |
| Serial-strobe output (SSTRB) | Provides hardware-synchronized conversion completion signal - simplifies timing-critical DSP or FPGA data capture. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
Use Scenario: Battery-powered environmental sensor node logging temperature, humidity, and CO₂ every 100ms. IC Role / Device Role / Timing Role: 10-bit ADC digitizing 8 analog sensor outputs sequentially with <1.5µs acquisition time per channel. Use Value: 1µA shutdown current extends 2xAA battery life to >2 years; SPI interface minimizes MCU GPIO usage. |
Use Scenario: Handheld ECG monitor acquiring lead I, II, III, aVR, aVL, aVF with common-mode rejection. IC Role / Device Role / Timing Role: Pseudo-differential ADC measuring voltage differences between electrode pairs while rejecting 50/60Hz interference. Use Value: ±1 LSB INL ensures diagnostic-grade amplitude accuracy; COM-referenced architecture simplifies front-end biasing. |
| Battery-Powered Test Equipment | Industrial Process Monitoring |
Use Scenario: Pocket multimeter measuring DC voltage, current, and resistance with auto-ranging. IC Role / Device Role / Timing Role: Configurable unipolar/bipolar input mode adapts to voltage (0–2.5V) and current shunt (-125mV to +125mV) ranges. Use Value: REFADJ pin enables factory calibration against precision voltage standard - improves absolute accuracy to ±0.1% FS. |
Use Scenario: PLC analog input module monitoring 4–20mA loop sensors across 8 field devices. IC Role / Device Role / Timing Role: High-impedance analog inputs (18kΩ min) interface directly to loop receivers without buffering. Use Value: 2.25MHz small-signal bandwidth supports transient detection in motor control feedback paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit, multi-channel serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX149BEAP+ | Integrated 2.5V reference (±30ppm/°C), no external VREF required; same pinout and timing. | Reduces BOM count in space-constrained designs where reference stability is less critical than layout simplicity. | Select MAX149BEAP+ when eliminating external reference components outweighs ±0.5 LSB INL advantage of external reference calibration. |
| ADS7822U | 8-channel, 12-bit, 200ksps, SPI-only interface; no SSTRB output; requires 2.7–5.25V supply. | Lacks TMS320 strobe support and software-selectable bipolar mode - limits use in DSP-centric or mixed-signal systems. | Choose ADS7822U only if higher resolution (12-bit) and faster sampling (200ksps) are mandatory, and strobe-less timing is acceptable. |
Compared with MAX149BEAP+, MAX148BEAP+ offers tighter INL (±1 LSB vs. ±1.5 LSB) and external reference control for calibrated systems; compared with ADS7822U, it trades 2-bit resolution for strobe-synchronized timing and bipolar configurability essential in medical and industrial signal chains.
Availability
MAX148BEAP+ is available at Aetrix Electronics and suitable for portable data logging, battery-powered instrumentation, and industrial process monitoring requiring stable component supply across extended production lifecycles.
Supply support for MAX148BEAP+ 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 markets.
The MAX148/MAX149 product line was designed for low-power, multi-channel data acquisition in space- and energy-constrained embedded systems, emphasizing flexible input configuration and minimal external component count.
FAQ
What is the reference voltage requirement for MAX148BEAP+?
MAX148BEAP+ requires an external 2.500V reference applied to the VREF pin. The internal reference buffer is enabled by default with gain = 2.00, so a 1.25V source at REFADJ yields 2.500V at VREF. The device does not include an internal reference - unlike MAX149BEAP+ - making external reference selection critical for absolute accuracy. MAX148BEAP+ supports VREF input range from 1.0V to (VDD + 50mV).
Does MAX148BEAP+ support differential input mode?
Yes, MAX148BEAP+ supports pseudo-differential input mode via software configuration (SGL/DIF = 0 in control byte). It forms four differential pairs: CH0/CH1, CH2/CH3, CH4/CH5, and CH6/CH7. In this mode, only the positive input (IN+) is actively sampled; the negative input (IN-) must remain stable within ±0.5 LSB relative to AGND during conversion. A 0.1µF capacitor from IN- to AGND is recommended to maintain stability.
What is the minimum acquisition time for MAX148BEAP+?
The guaranteed minimum acquisition time (tACQ) for MAX148BEAP+ is 1.5µs under typical conditions (RS ≤ 4kΩ). This value increases with source impedance per tACQ = 7 × (RS + 9kΩ) × 16pF. For sources >4kΩ, adding a 0.01µF capacitor at each analog input mitigates droop but reduces effective signal bandwidth due to RC filtering.
How does the SHDN pin function on MAX148BEAP+?
SHDN on MAX148BEAP+ is a three-level input: pulled low → full power-down (1µA); pulled high → reference buffer in internal compensation mode; left unconnected → reference buffer in external compensation mode (enabling REFADJ adjustment). Unlike simple enable/disable pins, SHDN directly configures the reference architecture - critical for achieving ±1.5% VREF tuning range.
Can MAX148BEAP+ interface directly with a TMS320 DSP?
Yes, MAX148BEAP+ supports direct connection to TMS320-family DSPs via its SSTRB (serial strobe) output. In internal clock mode, SSTRB goes low at conversion start and high at completion - providing hardware-ready signaling for DMA-triggered data capture. In external clock mode, SSTRB pulses high for one SCLK period before MSB output - aligning with TMS320's strobe-synchronized serial port timing requirements.
MAX148BEAP+ 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
- 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+ FAQ
1.How can I place an order for MAX148BEAP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX148BEAP+ 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+ reliable?
The price and inventory of MAX148BEAP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX148BEAP+ is usually 5 days.
3.What payment methods are accepted for MAX148BEAP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX148BEAP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX148BEAP+?
MAX148BEAP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX148BEAP+ 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+?
For technical support, including MAX148BEAP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX148BEAP+ requirements.
6.How does Aetrix verify that MAX148BEAP+ is sourced from the original manufacturer or authorized distributors?
All MAX148BEAP+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX148BEAP+?
All MAX148BEAP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX148BEAP+, 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+ part is unused and in its original packaging.
Return procedure for MAX148BEAP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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