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Analog Devices Inc./Maxim Integrated MAX148ACAP+T
- Part No.:
- MAX148ACAP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX148ACAP+T.pdf
- Description:
- IC ADC 10BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,720
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Product details
Overview
MAX148ACAP+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 1.2mA supply current at 3V, used in portable data loggers and battery-powered medical instruments.
For engineers reviewing the MAX148ACAP+T datasheet, MAX148ACAP+T pinout, MAX148ACAP+T application, or MAX148ACAP+T equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated SSOP-20 pin functions, confirmed alternative parts with documented differences, and supply-chain support for industrial embedded and low-power sensing designs.
Technical Context
The MAX148ACAP+T implements a successive-approximation register (SAR) ADC architecture with integrated track/hold circuitry, supporting both internal clock mode (1.8MHz typical) and external serial clock mode (up to 2.0MHz), enabling flexible timing control across microcontroller interfaces including SPI, QSPI, and MICROWIRE.
It features an 8-channel analog multiplexer with programmable input configuration-single-ended (8 channels) or pseudo-differential (4 channel pairs)-and a reference-buffer amplifier with ±1.5% voltage-adjustment range, requiring external reference (VREF = 2.500V) and REFADJ biasing to VDD to disable internal buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR conversion - delivers 1024 discrete digital codes for precise analog signal digitization. |
| Sampling Rate | 133ksps maximum - supports real-time acquisition of fast transients in portable instrumentation. |
| INL (Max) | ±0.5 LSB - ensures high code-linearity critical for accurate sensor signal reconstruction. |
| Supply Current | 1.2mA at 133ksps / 3V - enables multi-hour operation on coin-cell batteries in handheld devices. |
| Power-Down Current | 1µA - allows ultra-low quiescent power during idle intervals in duty-cycled systems. |
| Input Range | 0 to VREF (unipolar) or ±VREF/2 (bipolar) - accommodates both ground-referenced and AC-coupled sensor outputs. |
| Serial Interface | 4-wire SPI/QSPI/MICROWIRE-compatible - eliminates level-shifting or glue logic when interfacing with common MCUs. |
Pinout & Package
MAX148ACAP+T is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm lead pitch, optimized for space-constrained PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog Input Channels | Eight configurable analog inputs supporting single-ended or differential (CH0/CH1 etc.) sampling per control byte. |
| COM (Pin 9) | Analog Ground Reference | Sets zero-code voltage in single-ended mode; must be stable to ±0.5 LSB for full accuracy. |
| SHDN (Pin 10) | Three-Level Shutdown Control | Pulled low → full shutdown; high → internal compensation; floating → external compensation mode. |
| VREF (Pin 11) | Reference Buffer Output / ADC Reference Input | Accepts external 2.500V reference; buffer gain = 2.00×; requires REFADJ tied to VDD to disable. |
| REFADJ (Pin 12) | Reference Buffer Adjustment Input | Enables ±1.5% VREF tuning; tie to VDD to disable internal reference buffer for MAX148ACAP+T. |
| AGND / DGND (Pins 13, 14) | Analog & Digital Ground Returns | Separate AGND/DGND pins minimize noise coupling between analog and digital sections. |
| DOUT / SSTRB (Pins 15, 16) | Serial Data Output / Strobe Signal | DOUT clocks MSB-first on SCLK falling edge; SSTRB pulses before MSB in external clock mode or indicates conversion status in internal mode. |
| DIN / CS / SCLK (Pins 17–19) | Serial Interface Inputs | Standard SPI-compatible signals: DIN (rising-edge sampled), CS (active-low chip select), SCLK (bidirectional clock). |
| VDD (Pin 20) | Positive Supply Rail | Single +2.7V to +5.25V supply powers entire analog and digital circuitry; PSR = ±0.3mV over full range. |
Key Features
| Feature | Design Value |
|---|---|
| Software-Configurable Input Modes | Runtime selection of unipolar/bipolar and single-ended/differential via 8-bit control byte - eliminates hardware reconfiguration. |
| Low-Power Conversion Architecture | 1.2mA active current at 133ksps and 1µA shutdown - enables energy-efficient burst-mode acquisition in battery systems. |
| Integrated Track/Hold with 1.5µs Acquisition | On-chip T/H reduces external component count and ensures stable sampling even with moderate source impedances (<4kΩ). |
| SPI/QSPI/MICROWIRE/TMS320 Compatibility | Direct interface to industry-standard controllers without level shifters or protocol translation logic. |
| Flexible Clocking Options | Supports both internal clock (freeing MCU resources) and external clock (precise timing synchronization) modes. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure over extended periods. IC Role / Device Role / Timing Role: Primary ADC acquiring multi-channel analog sensor outputs with configurable gain and polarity. Use Value: 1µA shutdown current extends battery life; 133ksps sampling captures transient events like rapid temperature spikes. |
Use Scenario: Handheld ECG or pulse oximeter requiring compact, low-noise analog front-end. IC Role / Device Role / Timing Role: High-accuracy 10-bit digitizer for biopotential signals with bipolar input support for AC-coupled electrodes. Use Value: ±0.5 LSB INL preserves diagnostic fidelity; separate AGND/DGND minimizes digital switching noise in sensitive analog paths. |
| Battery-Powered Test Equipment | Industrial Process Monitoring |
Use Scenario: Field-deployable multimeter or data acquisition probe powered by AA cells. IC Role / Device Role / Timing Role: Core ADC handling autoranging, offset calibration, and dual-slope integration support via software control. Use Value: External reference input enables traceable calibration; 2.25MHz small-signal bandwidth supports fast settling after range changes. |
Use Scenario: Remote RTU monitoring analog process variables (flow, pressure, level) in distributed control systems. IC Role / Device Role / Timing Role: Isolated analog input conditioner feeding PLC or RTU controller via SPI interface. Use Value: 4-wire serial interface simplifies isolation barrier design; SSOP-20 package fits tight I/O module footprints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-channel, 12-bit, 200ksps, +2.7V to +5.5V, internal reference only, no REFADJ adjustment | Higher resolution but fixed reference; lacks software-selectable bipolar mode and external reference flexibility | Select if 12-bit precision outweighs configurability needs and reference sourcing constraints allow internal-only use |
| MAX11131ETE+ | 8-channel, 12-bit, 1MSPS, +2.7V to +3.6V, internal reference, SPI-only interface, 16-pin TQFN | Faster sampling and smaller package, but narrower supply range and no external reference option | Prefer for high-speed, space-constrained designs where 3.6V max supply and lack of REFADJ are acceptable |
Compared with MAX148ACAP+T, ADS7822U trades configurability for higher resolution and fixed reference simplicity, while MAX11131ETE+ offers speed and footprint reduction at the cost of supply flexibility and external reference support-making MAX148ACAP+T optimal for adaptable, low-power, multi-supply industrial and portable systems.
Availability
MAX148ACAP+T is available at Aetrix Electronics and suitable for portable data logging, battery-powered medical instruments, and industrial process monitoring requiring stable component supply across long production lifecycles.
Supply support for MAX148ACAP+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 MAX148 family targets low-power, multi-channel data acquisition in space- and energy-constrained systems, emphasizing flexible input configuration, minimal external components, and robust serial interfacing.
FAQ
What is the reference configuration requirement for MAX148ACAP+T?
The MAX148ACAP+T requires an external 2.500V reference applied to the VREF pin. Its internal reference buffer must be disabled by tying REFADJ to VDD. This differs from the MAX149, which integrates a 2.5V reference. Using the correct external reference and REFADJ biasing ensures ±0.5 LSB INL performance across temperature and supply variations in MAX148ACAP+T.
Does MAX148ACAP+T support differential input mode?
Yes, MAX148ACAP+T supports pseudo-differential input mode using four channel pairs: CH0/CH1, CH2/CH3, CH4/CH5, and CH6/CH7. The control byte's SGL/DIF bit selects this mode, and the ADC samples the voltage difference while maintaining stability on the negative input within ±0.5 LSB. This capability is confirmed in Tables 2 and 3 of the MAX148/MAX149 datasheet and applies directly to MAX148ACAP+T.
What is the minimum acquisition time for MAX148ACAP+T?
The guaranteed minimum acquisition time (tACQ) for MAX148ACAP+T is 1.5µs, defined as the time required for the internal track/hold to settle after the last control bit is clocked. This value is specified under standard conditions (VDD = 2.7V to 5.25V, fSCLK = 2.0MHz) and ensures full 10-bit accuracy. Exceeding this time is unnecessary unless driving from high-impedance sources (>4kΩ), where external 0.01µF capacitors per channel are recommended.
Can MAX148ACAP+T operate with a 2.5V supply?
No, MAX148ACAP+T has a minimum supply voltage of +2.7V as specified in Absolute Maximum Ratings and Electrical Characteristics. Operation below 2.7V risks failure to meet timing, linearity, or power-down specifications. The device is characterized and guaranteed from +2.7V to +5.25V; using 2.5V violates its operational envelope and is not supported for reliable function in MAX148ACAP+T.
How does the SHDN pin function on MAX148ACAP+T?
The SHDN pin on MAX148ACAP+T is a three-level control: pulled low → full shutdown (1µA); pulled high → internal compensation mode for reference buffer; left floating → external compensation mode (default for MAX148ACAP+T). This behavior is explicitly documented in the Pin Description section and applies identically across all MAX148 variants, including MAX148ACAP+T.
MAX148ACAP+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:
- 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
- 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:
- -
MAX148ACAP+T FAQ
1.How can I place an order for MAX148ACAP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX148ACAP+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 MAX148ACAP+T reliable?
The price and inventory of MAX148ACAP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX148ACAP+T is usually 5 days.
3.What payment methods are accepted for MAX148ACAP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX148ACAP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX148ACAP+T?
MAX148ACAP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX148ACAP+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 MAX148ACAP+T?
For technical support, including MAX148ACAP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX148ACAP+T requirements.
6.How does Aetrix verify that MAX148ACAP+T is sourced from the original manufacturer or authorized distributors?
All MAX148ACAP+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 MAX148ACAP+T meets industry standards.
7.What is the process for return or replacement of MAX148ACAP+T?
All MAX148ACAP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX148ACAP+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 MAX148ACAP+T part is unused and in its original packaging.
Return procedure for MAX148ACAP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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