My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX148ACAP+
- Part No.:
- MAX148ACAP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX148ACAP+.pdf
- Description:
- IC ADC 10BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,035
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX148ACAP+ 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 ±0.5 LSB INL at 0°C to +70°C, widely used in portable data loggers and battery-powered medical instruments.
For engineers reviewing the MAX148ACAP+ datasheet, MAX148ACAP+ pinout, MAX148ACAP+ application, or MAX148ACAP+ equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated SSOP-20 pin functions, confirmed low-power operation modes (1.2mA @133ksps, 1µA shutdown), and two rigorously cross-checked alternative ADCs for signal acquisition systems requiring SPI/QSPI/MICROWIRE compatibility.
Technical Context
The MAX148ACAP+ employs 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) for conversion control. Its analog front-end allows flexible input configuration: 8 single-ended or 4 pseudo-differential channels, with COM pin serving as zero-reference in single-ended mode and common-mode reference in differential mode.
It features a reference-buffer amplifier with ±1.5% voltage-adjustment range via REFADJ, requiring external reference (VREF = 2.500V) - unlike the MAX149 which includes an internal 2.5V reference. The 4-wire serial interface is natively compatible with SPI (CPOL=0, CPHA=0), QSPI, and MICROWIRE protocols, and supports direct TMS320-family DSP interfacing via SSTRB strobe output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete digital codes for precise analog signal digitization in embedded sensing. |
| Sampling Rate | 133ksps - enables real-time capture of signals up to ~66kHz Nyquist bandwidth in continuous acquisition. |
| INL (Integral Nonlinearity) | ±0.5 LSB - ensures monotonicity and <0.05% full-scale error after calibration, critical for measurement accuracy. |
| Supply Current | 1.2mA @133ksps, 3V - enables >8-hour runtime on a 100mAh Li-ion cell in active logging mode. |
| Shutdown Current | 1µA - reduces system standby power by >1000×, essential for battery longevity in intermittent-sampling applications. |
| Input Range | 0 to VREF (unipolar) or ±VREF/2 (bipolar) - supports both ground-referenced sensors and AC-coupled transducer outputs. |
| Serial Interface | SPI/QSPI/MICROWIRE/TMS320-compatible 4-wire - eliminates level-shifting or protocol translation logic in MCU-connected designs. |
Pinout & Package
MAX148ACAP+ is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm lead pitch, JEDEC MO-153 compliant, suitable for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Software-selectable as 8 single-ended or 4 pseudo-differential pairs (e.g., CH0/CH1); source impedance ≤4kΩ preserves AC performance. |
| COM (Pin 9) | Analog common reference | Sets zero-code voltage in single-ended mode; must remain stable to ±0.5 LSB during conversion to avoid offset drift. |
| SHDN (Pin 10) | Three-level shutdown control | Pulled low → full power-down; unconnected → external compensation mode for REFADJ; pulled high → internal compensation mode. |
| VREF (Pin 11) | Reference buffer output / ADC reference input | Accepts external 2.500V reference; buffer gain = 2.00×; requires 0.01µF bypass at REFADJ for stability. |
| REFADJ (Pin 12) | Reference buffer adjustment | Tie to VDD to disable internal buffer; otherwise enables ±1.5% fine-tuning of VREF output for calibration traceability. |
| AGND / DGND (Pins 13, 14) | Analog and digital ground returns | Must be separated and joined at single point near device; AGND-DGND voltage difference limited to ±0.3V per spec. |
| DOUT / SSTRB (Pins 15, 16) | Serial data output / conversion strobe | DOUT clocks MSB-first on SCLK falling edge; SSTRB pulses high before MSB in external clock mode, or goes low→high in internal mode. |
| DIN / CS / SCLK / VDD (Pins 17–20) | Serial data input, chip select, clock, supply | Standard SPI timing (CPOL=0, CPHA=0); CS must be held low during full 15-clock conversion cycle in external clock mode. |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel MUX + Track/Hold | Enables multiplexed sensor arrays without external sample-hold circuitry; 1.5µs acquisition time supports ≤2.25MHz small-signal bandwidth. |
| Software-configurable I/O | Single control byte selects unipolar/bipolar, single-ended/differential, channel, and clock mode - simplifies firmware abstraction layer. |
| Low-power adaptive operation | Auto-shutdown after conversion + instant wake-on-CS/DIN activity cuts average current to µA-range in burst-sampling systems. |
| Reference buffer with adjustability | ±1.5% REFADJ tuning range allows end-of-line calibration to compensate for PCB trace resistance and reference tolerance stack-up. |
| Robust digital interface | Guaranteed 15pF input capacitance and 20ns timing margins enable reliable communication with low-cost MCUs even over 2-inch PCB traces. |
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: Central 10-bit ADC acquiring 8 analog sensor outputs sequentially via internal MUX, synchronized to MCU sleep/wake cycles. Use Value: 1µA shutdown current extends 2xAA alkaline battery life beyond 1 year; ±0.5 LSB INL ensures calibrated sensor readings meet ISO 13485 traceability requirements. |
Use Scenario: Handheld ECG monitor digitizing amplified biopotential signals from 3-lead configuration. IC Role / Device Role / Timing Role: Pseudo-differential ADC measuring CH0–CH1 and CH2–CH3 pairs to reject common-mode noise from electrode contact impedance mismatch. Use Value: 66dB SINAD and -70dB THD preserve diagnostic waveform fidelity; software-selectable bipolar mode captures ±1.25V ECG swing without external level-shifting. |
| Battery-Powered Test Equipment | Industrial Process Monitoring |
|
Use Scenario: Pocket-sized multimeter with auto-ranging analog front-end and LCD display. IC Role / Device Role / Timing Role: High-accuracy ADC performing rapid successive conversions across voltage, current, and resistance ranges using COM-referenced single-ended inputs. Use Value: 1.2mA active current enables >20 hours of continuous use on a 2000mAh LiPo; ±1 LSB DNL guarantees no missing codes during autoranging transitions. |
Use Scenario: DIN-rail mounted PLC analog input module monitoring 4–20mA current loops from flow and pressure transmitters. IC Role / Device Role / Timing Role: Isolated ADC channel interface converting conditioned 0–5V loop outputs with programmable unipolar scaling and CRC-protected SPI readback. Use Value: SPI compatibility allows direct connection to ARM Cortex-M7 host without glue logic; 2.7V–5.25V supply range matches industrial 3.3V/5V rail availability. |
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-only interface; no internal track/hold; requires external RC anti-alias filter; 2.7–5.5V supply; 1.25mW @100ksps. | Higher resolution but lacks integrated MUX and T/H; better for static precision measurements than dynamic multi-channel acquisition. | Select when 12-bit resolution outweighs need for on-chip multiplexing and track/hold - e.g., calibration-grade bench equipment. |
| MAX11100ETE+ | 8-channel, 10-bit, internal oscillator; SPI/QSPI/MICROWIRE; ±0.5 LSB INL; 2.7–3.6V only; 1.1mA @100ksps; 20-TQFN package. | Narrower supply range limits use in 5V legacy systems; smaller TQFN footprint saves board space but complicates hand-soldering. | Prefer for space-constrained 3.3V designs where thermal performance and reflow compatibility outweigh SSOP handling advantages. |
Compared with ADS7822U and MAX11100ETE+, the MAX148ACAP+ uniquely combines 8-channel MUX, integrated track/hold, wide 2.7–5.25V operation, and three-level SHDN control - making it optimal for portable, multi-sensor systems demanding both flexibility and ultra-low quiescent power.
Availability
MAX148ACAP+ is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and industrial process monitoring requiring stable component supply across extended production lifecycles.
Supply support for MAX148ACAP+ 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 leader specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and communications markets.
The MAX148 family was designed specifically for low-power, multi-channel data acquisition in space- and energy-constrained embedded systems - emphasizing integration, configurability, and robust serial interfacing without sacrificing DC accuracy.
FAQ
What is the maximum sampling rate achievable with MAX148ACAP+?
The MAX148ACAP+ achieves a maximum sampling rate of 133ksps when using a 2.0MHz external serial clock and 15 clock cycles per conversion. This rate is sustained across its full operating temperature range (0°C to +70°C) and supply range (+2.7V to +5.25V), with timing validated per Figure 6 and Table 1 in the official datasheet. At lower clock frequencies, the rate scales linearly - e.g., 100kHz SCLK yields ~665sps.
Does MAX148ACAP+ include an internal voltage reference?
No, the MAX148ACAP+ does not include an internal voltage reference. It requires an external 2.500V reference applied to the VREF pin, as explicitly stated in the General Description and Electrical Characteristics sections. In contrast, the pin-compatible MAX149 variant integrates a 2.5V reference. The MAX148ACAP+ does feature a reference-buffer amplifier with ±1.5% adjustment range via REFADJ, but the reference source itself must be supplied externally.
How is the input configuration (single-ended vs. differential) controlled on MAX148ACAP+?
Input configuration on the MAX148ACAP+ is controlled entirely by the 2-bit SGL/DIF field (bit 2) in the 8-bit serial control byte. Setting SGL/DIF = 1 configures all channels for single-ended operation relative to the COM pin; setting SGL/DIF = 0 enables pseudo-differential mode using predefined channel pairs (CH0/CH1, CH2/CH3, etc.), as detailed in Tables 2 and 3. This software-selectable method eliminates the need for external jumpers or hardware modifications.
What is the purpose of the SHDN pin on MAX148ACAP+?
The SHDN pin on MAX148ACAP+ provides three distinct operational states: pulling it low enables full power-down (1µA supply current); leaving it unconnected activates external compensation mode for the reference buffer; pulling it high enables internal compensation mode. This triple functionality allows precise control over both system-level power gating and reference stability tuning - a capability not found in most competing 10-bit ADCs.
Which microcontroller interfaces are natively supported by MAX148ACAP+?
The MAX148ACAP+ natively supports SPI (with CPOL=0, CPHA=0), QSPI, and MICROWIRE protocols via its 4-wire serial interface (CS, SCLK, DIN, DOUT). It also supports direct connection to TMS320-family DSPs using the SSTRB strobe output. No external logic or level shifters are required for compatibility with standard ARM Cortex-M, PIC, or MSP430 microcontrollers operating within the +2.7V to +5.25V supply range.
MAX148ACAP+ 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:
- 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+ FAQ
1.How can I place an order for MAX148ACAP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX148ACAP+ 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+ reliable?
The price and inventory of MAX148ACAP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX148ACAP+ is usually 5 days.
3.What payment methods are accepted for MAX148ACAP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX148ACAP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX148ACAP+?
MAX148ACAP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX148ACAP+ 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+?
For technical support, including MAX148ACAP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX148ACAP+ requirements.
6.How does Aetrix verify that MAX148ACAP+ is sourced from the original manufacturer or authorized distributors?
All MAX148ACAP+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX148ACAP+?
All MAX148ACAP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX148ACAP+, 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+ part is unused and in its original packaging.
Return procedure for MAX148ACAP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX148ACAP+ Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
