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Analog Devices Inc./Maxim Integrated MAX148BCAP+T
- Part No.:
- MAX148BCAP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX148BCAP+T.pdf
- Description:
- IC ADC 10BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,497
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Product details
Overview
MAX148BCAP+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 sampling rate and ±1 LSB integral nonlinearity at 0°C to +70°C - used in portable data loggers for battery-constrained signal digitization.
For engineers reviewing the MAX148BCAP+T datasheet, MAX148BCAP+T pinout, MAX148BCAP+T application, or MAX148BCAP+T equivalent, this page delivers verified electrical specs, SSOP-20 package mapping, SPI/QSPI/MICROWIRE-compatible 4-wire interface behavior, and real-world design implications for low-power, multi-channel acquisition systems.
Technical Context
The MAX148BCAP+T implements successive-approximation (SAR) architecture with integrated track/hold, supporting both internal clock mode (1.8MHz typical) and external serial clock mode (up to 2.0MHz). It uses a 16pF capacitive DAC and pseudo-differential input switching to resolve voltage differences across CH0–CH7 pairs.
Its analog front-end includes programmable reference buffer (disabled by tying REFADJ to VDD), COM-referenced single-ended operation, and channel-to-channel crosstalk of –75dB at 65kHz - enabling simultaneous high-fidelity sampling without hardware multiplexer overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output codes for precision measurement within ±1 LSB INL tolerance. |
| Sampling Rate | 133ksps - supports real-time capture of signals up to ~66.5kHz Nyquist bandwidth in continuous mode. |
| Supply Voltage Range | +2.7V to +5.25V - enables direct interfacing with Li-ion, 3.3V, and 5V logic domains without level-shifting. |
| Power Consumption | 1.2mA at 133ksps / 3V - allows >8-hour operation on 100mAh battery in active acquisition; drops to 1µA in full power-down. |
| Input Configuration | 8-channel single-ended or 4-channel differential - selectable via software control byte, eliminating external mux components. |
| Reference Support | External reference only (VREF = 2.500V required) - mandates stable external reference source; internal buffer disabled by REFADJ = VDD. |
| Serial Interface | SPI/QSPI/MICROWIRE/TMS320-compatible 4-wire - operates without glue logic; SSTRB enables tight timing sync with DSPs. |
Pinout & Package
MAX148BCAP+T is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm lead pitch, JEDEC MO-153 compliant, suitable for compact PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Accept single-ended or differential (CH0/CH1, CH2/CH3, etc.) signals; input capacitance 16pF limits source impedance to <4kΩ for full AC performance. |
| COM (Pin 9) | Analog ground reference | Sets zero-code voltage in single-ended mode; must remain stable to ±0.5 LSB during conversion to avoid INL error. |
| SHDN (Pin 10) | Three-level shutdown control | Pull low → full power-down; leave floating → external compensation mode; pull high → internal compensation mode (buffer enabled). |
| VREF (Pin 11) | Reference input/output | Accepts external 2.500V reference (buffer disabled); no internal reference - unlike MAX149, MAX148BCAP+T requires external VREF source. |
| REFADJ (Pin 12) | Reference buffer control | Tie to VDD to disable internal reference buffer - mandatory for external reference operation per datasheet configuration. |
| AGND / DGND (Pins 13, 14) | Analog and digital ground returns | Must be separated and joined at single point near VDD decoupling to minimize noise coupling into SAR core. |
| DOUT / SSTRB / DIN / CS / SCLK (Pins 15–19) | 4-wire serial interface | Full-duplex SPI-compatible I/O; DOUT valid on SCLK falling edge; SSTRB provides conversion status strobe for TMS320-family DSP synchronization. |
| VDD (Pin 20) | Positive supply | Supplies analog and digital sections; requires 0.1µF ceramic + 4.7µF bulk decoupling adjacent to pin to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input mode | Unipolar (0 to VREF) or bipolar (±VREF/2) selected per conversion via control byte - eliminates hardware jumpers or external op-amp reconfiguration. |
| Low-power adaptive shutdown | Auto-shutdown after conversion + fast wake-up (<1µs turn-on) enables duty-cycled acquisition - reduces average current to <54µA at 1ksps. |
| Integrated track/hold with 1.5µs acquisition time | Eliminates need for external TH circuitry; tACQ = 7 × (RS + 9kΩ) × 16pF - sets maximum allowable source impedance for specified accuracy. |
| High noise immunity serial interface | SCLK hysteresis (0.2V), 15pF input capacitance, and 200ns setup/hold margins ensure robust communication in electrically noisy industrial environments. |
| Channel-to-channel crosstalk suppression | –75dB at 65kHz - prevents interference between active and inactive channels during multiplexed scanning, critical for multi-sensor monitoring. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure over 72-hour field deployment. IC Role / Device Role / Timing Role: Primary ADC digitizing 8 analog sensor outputs sequentially with software-selectable gain and polarity per channel. Use Value: 1.2mA active current and 1µA shutdown enable >1-year shelf life; SSOP-20 footprint minimizes board area in handheld enclosure. |
Use Scenario: Portable ECG monitor acquiring lead I, II, III, aVR, aVL, aVF, V1–V6 signals with baseline stability and low noise floor. IC Role / Device Role / Timing Role: Multi-channel front-end ADC performing pseudo-differential sampling to reject common-mode interference from body coupling. Use Value: ±1 LSB INL and 66dB SINAD preserve diagnostic waveform fidelity; COM-referenced architecture simplifies electrode biasing network. |
| Battery-Powered Test Equipment | Industrial Process Control |
Use Scenario: Handheld multimeter with auto-ranging voltage/current/resistance measurement and data hold function. IC Role / Device Role / Timing Role: Core acquisition engine handling 8 input ranges via external PGA and programmable reference scaling. Use Value: External reference support (2.500V) enables traceable calibration against metrology-grade sources; 133ksps allows fast continuity testing. |
Use Scenario: PLC analog input module monitoring 8 thermocouple or 4–20mA loop signals in factory automation cabinet. IC Role / Device Role / Timing Role: Isolated channel ADC interfacing to signal-conditioning stage with galvanic separation per channel. Use Value: SPI-compatible interface simplifies FPGA-based controller integration; 2.25MHz small-signal bandwidth supports transient fault detection. |
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 |
|---|---|---|---|
| MAX149BCAP+T | Includes internal 2.5V reference (±30ppm/°C TC); same pinout, package, and timing - requires no external reference but lacks REFADJ adjustment range. | Preferred where board space is constrained and reference stability requirements allow ±30ppm/°C drift; unsuitable when external calibrated reference is mandated. | Select MAX149BCAP+T if internal reference suffices and layout simplification outweighs loss of external reference traceability. |
| ADS7822U | 12-bit resolution, 200ksps, SPI-only interface, no SSTRB output; consumes 2.2mA at 200ksps; requires external reference and separate power supplies for analog/digital sections. | Better resolution and speed, but higher power and no DSP strobe - suited for high-accuracy benchtop instruments rather than battery-operated field units. | Choose ADS7822U only when 12-bit precision is essential and power budget permits 2.2mA continuous draw; not drop-in compatible due to different pinout and missing SSTRB. |
Compared with MAX149BCAP+T, MAX148BCAP+T trades internal reference convenience for external reference flexibility and metrological traceability; versus ADS7822U, it prioritizes ultra-low power and DSP synchronization over raw resolution - making it optimal for long-life, embedded, multi-sensor acquisition where reference sourcing is controlled externally.
Availability
MAX148BCAP+T 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 MAX148BCAP+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 and mixed-signal ICs for demanding industrial, medical, and portable applications - emphasizing low power, high integration, and robust performance.
The MAX148/MAX149 product line targets low-power, multi-channel data acquisition systems where software configurability, small footprint, and flexible reference architecture reduce system-level complexity and bill-of-materials cost.
FAQ
What is the reference configuration requirement for MAX148BCAP+T?
MAX148BCAP+T requires an external 2.500V reference applied to the VREF pin; its internal reference buffer must be disabled by connecting REFADJ to VDD. Unlike MAX149, it has no internal reference - so accuracy depends entirely on external reference stability, load regulation, and bypassing (4.7µF recommended at VREF).
Does MAX148BCAP+T support differential input mode, and how is it configured?
Yes, MAX148BCAP+T supports 4-channel differential mode (CH0/CH1, CH2/CH3, CH4/CH5, CH6/CH7) via software control byte bit SGL/DIF = 0. The device performs pseudo-differential sampling: only the IN+ side is actively sampled, while IN− must remain stable to ±0.5 LSB relative to AGND - achieved using 0.1µF capacitor from IN− to AGND.
What is the minimum acquisition time and how does source impedance affect it?
The guaranteed maximum acquisition time tACQ is 1.5µs, calculated as tACQ = 7 × (RS + 9kΩ) × 16pF. For RS < 4kΩ, tACQ remains near 1.5µs; above that, acquisition time increases linearly - requiring longer inter-conversion delays or addition of 0.01µF input capacitors to maintain accuracy without degrading bandwidth.
How does the SHDN pin function on MAX148BCAP+T?
SHDN is a three-level input: pulled low → full power-down (1µA); left floating → external compensation mode (REFADJ buffered); pulled high → internal compensation mode (REFADJ unbuffered). In all states, accessing the serial interface automatically powers up the device, and quick turn-on allows shutdown between conversions to minimize average current.
Can MAX148BCAP+T interface directly with TMS320-family DSPs?
Yes, MAX148BCAP+T features a dedicated SSTRB (serial-strobe) output that pulses synchronously with conversion start/end - enabling direct handshake with TMS320 Cx/Cxx/C5x/C6x DSPs. In internal clock mode, SSTRB goes low at conversion start and high at completion; in external mode, it pulses high for one SCLK period before MSB output.
MAX148BCAP+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:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX148BCAP+T FAQ
1.How can I place an order for MAX148BCAP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX148BCAP+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 MAX148BCAP+T reliable?
The price and inventory of MAX148BCAP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX148BCAP+T is usually 5 days.
3.What payment methods are accepted for MAX148BCAP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX148BCAP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX148BCAP+T?
MAX148BCAP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX148BCAP+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 MAX148BCAP+T?
For technical support, including MAX148BCAP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX148BCAP+T requirements.
6.How does Aetrix verify that MAX148BCAP+T is sourced from the original manufacturer or authorized distributors?
All MAX148BCAP+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 MAX148BCAP+T meets industry standards.
7.What is the process for return or replacement of MAX148BCAP+T?
All MAX148BCAP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX148BCAP+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 MAX148BCAP+T part is unused and in its original packaging.
Return procedure for MAX148BCAP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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