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Analog Devices Inc./Maxim Integrated MAX145ACUA+T
- Part No.:
- MAX145ACUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX145ACUA+T.pdf
- Description:
- IC ADC 12BIT SAR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,930
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Product details
Overview
MAX145ACUA+T from Maxim Integrated is a 12-bit pseudo-differential successive-approximation ADC operating from +2.7V to +5.25V, delivering 108ksps sampling rate, ±0.5 LSB INL, 7.4µs conversion time, and 0.9mA supply current at 108ksps with +3V supply. It serves as a low-power analog front-end in isolated data acquisition and portable instrumentation.
For engineers reviewing the MAX145ACUA+T datasheet, MAX145ACUA+T pinout, MAX145ACUA+T application, or MAX145ACUA+T equivalent, this page provides verified electrical parameters, µMAX-8 package mapping, SPI/QSPI/MICROWIRE interface timing constraints, and validated alternative parts for battery-powered and space-constrained signal conditioning designs.
Technical Context
The MAX145ACUA+T implements a SAR architecture with integrated track-and-hold, supporting pseudo-differential input (CH+, CH−) referenced to GND, where CH− must remain stable within ±0.5 LSB during conversion. Its internal clock mode operates at ~2MHz ±20%, while external clock mode accepts 100kHz–2.17MHz SCLK for precise timing control.
Conversion is initiated by CS/SHDN falling edge, with acquisition time tACQ = 7µs (typical) and wake-up time of 2.5µs from shutdown. The 3-wire serial interface outputs 16-bit frames - three leading '1's, channel ID bit, and 12-bit MSB-first data - compatible with SPI (CPOL=0, CPHA=0), QSPI, and MICROWIRE protocols.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = VREF/4096 quantization step, enabling sub-mV precision with 2.5V reference. |
| Sampling Rate | 108ksps - supports Nyquist-limited bandwidth up to 54kHz; undersampling feasible up to 1MHz full-power bandwidth. |
| INL | ±0.5 LSB (max) - ensures monotonicity and <0.012% full-scale linearity error across 0°C to +70°C range. |
| Power Consumption | 0.9mA at 108ksps (+3V) - enables >1000hr operation on a 1Ah Li-ion cell in continuous acquisition mode. |
| Shutdown Current | 0.2µA - reduces average power to nanowatt levels during idle intervals in duty-cycled sensor systems. |
| Reference Input | External 0–VDD+50mV - requires ≥18kΩ DC input resistance and ≤10Ω source impedance for <1LSB drift. |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible 3-wire - eliminates need for level-shifting or protocol translation in µC-based data loggers. |
Pinout & Package
MAX145ACUA+T is housed in an 8-pin µMAX package (U8-1), measuring 3mm × 3mm × 0.8mm, with exposed pad for thermal enhancement and RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +5.25V; powers analog core, digital logic, and internal T/H; bypass with 0.1µF near pin. |
| CH0 (CH+) (Pin 2) | Pseudo-differential positive input | Primary analog input node; sampled during conversion; requires stable CH− reference within ±0.5 LSB. |
| CH1 (CH−) (Pin 3) | Pseudo-differential negative input | Return path for CH+; must be decoupled to GND with 0.1µF capacitor to maintain common-mode stability. |
| GND (Pin 4) | Analog/digital ground | Single-point return for all currents; separates noise-sensitive analog paths from digital switching transients. |
| REF (Pin 5) | External reference voltage input | Sets full-scale range (0 to VREF); minimum 18kΩ input resistance; requires 0.1µF ceramic bypass. |
| CS/SHDN (Pin 6) | Chip-select / shutdown control | Active-high shutdown disables all circuitry; active-low enables conversion; toggling selects channel or initiates sample. |
| DOUT (Pin 7) | Serial data output | 3-state, MSB-first 16-bit frame; transitions on SCLK falling edge; high-impedance when CS/SHDN = high. |
| SCLK (Pin 8) | Serial clock input | Drives data shift-out and controls conversion timing; mode selected by SCLK state at CS/SHDN fall (high = internal, low = external). |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | Eliminates dual-rail power design complexity and reduces BOM count in portable systems powered from 3.3V or 5V rails. |
| Pseudo-differential input architecture | Rejects common-mode noise on CH− while sampling only CH+, enabling robust sensing in noisy industrial environments without full differential driver. |
| Automatic power-down | Reduces quiescent current to 0.2µA between conversions, extending battery life in intermittent-read applications like environmental monitors. |
| Internal track-and-hold | Removes need for external T/H amplifier; acquires signal in 7µs with 9kΩ || 16pF input impedance, simplifying anti-alias filter design. |
| µMAX-8 package | 3mm × 3mm footprint saves >60% board area vs. SOIC-8, critical for wearable medical sensors and compact IoT nodes. |
Applications
| Battery-Powered Data Loggers | Isolated Industrial Sensors |
|---|---|
|
Use Scenario: Continuous temperature/humidity logging in remote field deployments using coin-cell or Li-SOCl₂ batteries. IC Role / Device Role / Timing Role: Primary analog front-end digitizing conditioned sensor outputs at 1–10ksps with automatic shutdown between samples. Use Value: 0.2µA shutdown current and 0.9mA active current enable multi-year operation; SPI interface minimizes µC GPIO usage. |
Use Scenario: Voltage/current monitoring in motor drives with galvanic isolation between power stage and controller. IC Role / Device Role / Timing Role: Isolated-side ADC acquiring feedback signals across opto- or capacitive isolators before transmission to host MCU. Use Value: Pseudo-differential input rejects common-mode transients induced across isolation barrier; 108ksps supports fast-loop control sampling. |
| Portable Medical Instruments | Process-Control Transmitters |
|
Use Scenario: Handheld ECG or pulse oximeter requiring low-noise, low-power signal digitization near patient. IC Role / Device Role / Timing Role: Front-end ADC converting amplified biopotential signals with minimal self-heating and EMI susceptibility. Use Value: ±0.5 LSB INL ensures diagnostic-grade accuracy; 2.25MHz small-signal bandwidth preserves waveform fidelity for HRV analysis. |
Use Scenario: 4–20mA loop-powered field transmitter digitizing pressure/flow sensor outputs in hazardous areas. IC Role / Device Role / Timing Role: Precision ADC interfacing with ratiometric bridge sensors and driving HART modem via same serial bus. Use Value: External reference support enables ratiometric measurement immunity to supply variation; 8-pin µMAX fits tight enclosure constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit pseudo-differential SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7816U | 8-pin SOIC only; 100ksps max; no internal T/H; requires external reference buffer; ±1 LSB INL. | Lacks µMAX footprint and auto-shutdown; suited for cost-sensitive, non-battery applications with existing reference buffers. | Select when board space is unconstrained and system already includes precision reference circuitry. |
| AD7476ARMZ | 12-bit, 1MSPS, single-ended only; 6-pin SOT-23; 3.6mW @ 1MSPS; ±0.5 LSB INL; SPI-only interface. | No pseudo-differential capability; higher speed but higher power; incompatible pinout and input topology. | Choose for high-throughput single-ended channels where differential rejection is not required. |
Compared with MAX145ACUA+T, ADS7816U trades package size and power efficiency for lower cost and simpler reference handling, while AD7476ARMZ offers higher speed at the expense of input flexibility and shutdown capability - making MAX145ACUA+T optimal for space- and energy-constrained pseudo-differential sensing.
Availability
MAX145ACUA+T is available at Aetrix Electronics and suitable for battery-powered data loggers, isolated industrial sensors, portable medical instruments, and process-control transmitters requiring stable component supply across extended production lifecycles.
Supply support for MAX145ACUA+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 MAX144/MAX145 family was engineered for ultra-low-power, space-constrained data acquisition - delivering 12-bit accuracy with integrated T/H and SPI-compatible serial output in sub-3mm packages.
FAQ
What is the maximum sampling rate of the MAX145ACUA+T, and under what conditions is it guaranteed?
The MAX145ACUA+T achieves a guaranteed 108ksps sampling rate when operated with VDD = +2.7V to +5.25V, VREF = 2.5V, fSCLK = 2.17MHz in external clock mode, and CH− tied to stable reference. This rate corresponds to a 7.4µs conversion time and is specified over the full 0°C to +70°C operating temperature range.
Does the MAX145ACUA+T support true differential input, or is its input architecture different?
The MAX145ACUA+T uses a pseudo-differential input architecture: only CH+ (Pin 2) is actively sampled, while CH− (Pin 3) serves as a stable reference node that must remain within ±0.5 LSB of GND during conversion. It does not perform simultaneous differential sampling like a true differential ADC, but provides common-mode noise rejection through careful CH− decoupling.
How does the CS/SHDN pin function in the MAX145ACUA+T, and what happens when it is held high?
In the MAX145ACUA+T, the CS/SHDN pin serves dual roles: pulled low to initiate conversion and sampling, and pulled high to enter shutdown mode. When CS/SHDN = VDD, internal circuitry powers down completely, reducing supply current to 0.2µA (typical); DOUT enters high-impedance state, and the device ignores SCLK activity until the next falling edge.
What serial interface standards is the MAX145ACUA+T compatible with, and what configuration is required?
The MAX145ACUA+T is fully compatible with SPI, QSPI, and MICROWIRE interfaces. It requires CPOL = 0 and CPHA = 0 configuration; data is output MSB-first on DOUT at SCLK's falling edge and should be latched on the rising edge. No additional level-shifting or protocol translation is needed for direct connection to standard microcontroller serial peripherals.
Can the MAX145ACUA+T operate without an external reference, and what are the REF pin requirements?
No, the MAX145ACUA+T requires an external reference applied to the REF pin (Pin 5). The reference must be stable, capable of sourcing 250µA DC load current, and exhibit ≤10Ω output impedance. A 0.1µF ceramic capacitor must be placed directly at the REF pin to ensure noise-free operation and maintain ±0.5 LSB INL performance.
MAX145ACUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 108k
- Number of Inputs:
- 1
- Input Type:
- Pseudo-Differential
- 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:
- 8-uMAX/uSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX145ACUA+T FAQ
1.How can I place an order for MAX145ACUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX145ACUA+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 MAX145ACUA+T reliable?
The price and inventory of MAX145ACUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX145ACUA+T is usually 5 days.
3.What payment methods are accepted for MAX145ACUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX145ACUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX145ACUA+T?
MAX145ACUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX145ACUA+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 MAX145ACUA+T?
For technical support, including MAX145ACUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX145ACUA+T requirements.
6.How does Aetrix verify that MAX145ACUA+T is sourced from the original manufacturer or authorized distributors?
All MAX145ACUA+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 MAX145ACUA+T meets industry standards.
7.What is the process for return or replacement of MAX145ACUA+T?
All MAX145ACUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX145ACUA+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 MAX145ACUA+T part is unused and in its original packaging.
Return procedure for MAX145ACUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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