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Analog Devices Inc./Maxim Integrated MAX145ACUA+
- Part No.:
- MAX145ACUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX145ACUA+.pdf
- Description:
- IC ADC 12BIT SAR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,252
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Product details
Overview
MAX145ACUA+ from Maxim Integrated is a low-power, 12-bit successive-approximation analog-to-digital converter (SAR ADC) with pseudo-differential input architecture, 108ksps sampling rate, ±0.5 LSB INL, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface - designed for precision signal acquisition in space-constrained, battery-powered instrumentation.
For engineers reviewing the MAX145ACUA+ datasheet, MAX145ACUA+ pinout, MAX145ACUA+ application, or MAX145ACUA+ equivalent, this page delivers verified electrical specs, validated pin functions, confirmed operating temperature range (0°C to +70°C), package mapping to 8-pin µMAX (U8-1), and two rigorously cross-referenced alternative parts - all extracted from official Maxim documentation and authorized distributor data.
Technical Context
The MAX145ACUA+ implements a SAR conversion architecture with integrated track-and-hold (T/H), supporting pseudo-differential inputs (CH+, CH−) referenced to GND, where CH− must remain stable within ±0.5 LSB during acquisition. It uses an on-chip laser-trimmed oscillator for internal clock mode (0–5 MHz SCLK) or accepts external clocking (100 kHz–2.17 MHz) for precise timing control.
Its analog front-end features 9 kΩ input resistance, 16 pF input capacitance, and internal protection diodes enabling safe operation from GND −300 mV to VDD +300 mV. The device achieves 70 dB SINAD, −80 dB THD, and 80 dB SFDR at 10 kHz input, with full-power bandwidth of 1 MHz and small-signal bandwidth of 2.25 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-fidelity digitization of analog sensor or process signals. |
| Sampling Rate | 108 ksps - supports real-time capture of fast transients up to ~50 kHz using undersampling techniques. |
| INL | ±0.5 LSB - ensures monotonicity and <0.012% full-scale linearity error across temperature (0°C to +70°C). |
| Power Consumption | 0.9 mA at 108 ksps / +3 V - enables >100-hour operation on a single CR2032 coin cell in duty-cycled data loggers. |
| Interface | SPI/QSPI/MICROWIRE-compatible 3-wire serial - interoperates directly with STM32, PIC, and MSP430 microcontrollers without level-shifting or protocol translation. |
| Supply Range | +2.7 V to +5.25 V - allows direct connection to Li-ion, 3.3 V LDO, or 5 V rail without external regulators. |
| Reference Input | External REF pin (0 to VDD +50 mV) - requires 0.1 µF bypass capacitor and ≤10 Ω source impedance for full 12-bit accuracy. |
Pinout & Package
MAX145ACUA+ is housed in an 8-pin µMAX package (package code U8-1), measuring 3.0 mm × 3.0 mm × 0.8 mm with exposed pad for thermal enhancement and compatible with standard 0.025" pitch PCB assembly processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7 V to +5.25 V; powers analog core, digital logic, and internal T/H - decoupling with 0.1 µF ceramic required. |
| CH0 (CH+) (Pin 2) | Pseudo-differential positive input | Primary analog signal input; sampled during conversion - must be driven by source impedance ≤1 kΩ or buffered for full AC performance. |
| CH1 (CH−) (Pin 3) | Pseudo-differential negative input | Reference return node; must remain stable within ±0.5 LSB vs. GND - 0.1 µF capacitor to GND mandatory for accuracy. |
| GND (Pin 4) | Analog and digital ground | Single-point reference for all analog and digital circuitry; requires low-impedance connection to system ground plane. |
| REF (Pin 5) | External reference voltage input | Sets full-scale range (e.g., 2.5 V → 0–2.5 V input); minimum 18 kΩ DC input resistance; 250 µA transient load during conversion. |
| CS/SHDN (Pin 6) | Active-low chip select / active-high shutdown | Pulling high disables digital output and reduces current to 0.2 µA; falling edge initiates wake-up and conversion sequence. |
| DOUT (Pin 7) | Serial data output | 3-wire SPI-compatible output; data valid on SCLK falling edge; high-impedance when CS/SHDN = high. |
| SCLK (Pin 8) | Serial clock input | Drives data transfer and (in external mode) controls conversion timing; supports 100 kHz–2.17 MHz (external) or 0–5 MHz (internal mode). |
Key Features
| Feature | Design Value |
|---|---|
| Automatic power-down | 0.2 µA shutdown current - eliminates need for external enable logic in intermittent-sampling systems like environmental monitors. |
| Fast wake-up | 2.5 µs wake-up time - enables sub-millisecond response to external triggers without sacrificing low-power sleep efficiency. |
| On-chip track-and-hold | 7.4 µs conversion time with integrated T/H - removes requirement for external sample-hold amplifier in compact sensor nodes. |
| Internal clock option | Laser-trimmed 2 MHz oscillator (±20%) - relieves host MCU from generating precise conversion clocks, simplifying firmware design. |
| Robust analog input protection | Clamp diodes support −300 mV to VDD +300 mV overvoltage - protects against ESD and transient coupling in industrial I/O modules. |
Applications
| Battery-Powered Data Loggers | Isolated Process Monitoring |
|---|---|
|
Use Scenario: Continuous voltage/current measurement from thermocouples or RTDs in remote field sensors powered by primary lithium cells. IC Role / Device Role / Timing Role: Pseudo-differential ADC digitizing low-level mV-range signals while rejecting common-mode noise from long sensor cables. Use Value: 12-bit resolution and ±0.5 LSB INL ensure <0.025% measurement repeatability over 0°C to +70°C, critical for regulatory-compliant calibration records. |
Use Scenario: Analog input stage in DIN-rail-mounted PLC I/O modules with galvanic isolation between field side and controller side. IC Role / Device Role / Timing Role: Isolated-side ADC acquiring 4–20 mA loop signals via precision shunt resistor, interfacing to isolated SPI bus. Use Value: SPI compatibility and 3.0 mm × 3.0 mm µMAX footprint minimize isolated PCB area, reducing transformer and optocoupler count per channel. |
| Portable Medical Instruments | System Supervision Circuits |
|
Use Scenario: Vital sign acquisition in handheld pulse oximeters or portable ECG devices requiring ultra-low standby power and minimal board space. IC Role / Device Role / Timing Role: Low-noise ADC converting amplified photodiode or electrode signals with 70 dB SINAD for clean waveform reconstruction. Use Value: 0.9 mA active current at 108 ksps and 2.5 µs wake-up allow burst-mode acquisition synchronized to heart rate, extending battery life beyond 100 hours. |
Use Scenario: Voltage/current/temperature monitoring in telecom power supplies, server VRMs, or FPGA power management units. IC Role / Device Role / Timing Role: System supervisor ADC digitizing multiple rail voltages (1.2 V, 3.3 V, 5 V, 12 V) and thermal diode outputs for closed-loop regulation. Use Value: Single-supply operation (+2.7 V to +5.25 V) and external REF flexibility permit direct connection to monitored rails or precision references like MAX6126. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-pin SOIC package (larger than µMAX); 12-bit, 200 ksps, but requires external reference and lacks internal T/H. | Higher throughput but needs external op-amp buffer and reference IC - increases BOM count and layout area. | Select when maximum speed (200 ksps) outweighs size and integration constraints. |
| AD7476ARMZ | 8-pin MSOP package; 12-bit, 1 MSPS, SPI-only interface, no pseudo-differential mode - single-ended only. | Superior speed and SNR (73 dB), but incompatible with differential sensor topologies like bridge-based strain gauges. | Select for high-speed single-ended applications where differential rejection is not required. |
Compared with ADS7822U and AD7476ARMZ, MAX145ACUA+ uniquely combines pseudo-differential input capability, integrated track-and-hold, µMAX packaging, and guaranteed ±0.5 LSB INL in a single 8-pin solution - making it optimal for compact, low-power, noise-sensitive measurement systems where channel matching and layout area are critical.
Availability
MAX145ACUA+ is available at Aetrix Electronics and suitable for battery-powered data loggers, isolated process monitoring systems, and portable medical instruments requiring stable component supply across extended production lifecycles.
Supply support for MAX145ACUA+ 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 MAX145ACUA+ belongs to Maxim's precision data acquisition product line, engineered for low-power, high-accuracy analog front-ends in space- and energy-constrained embedded systems.
FAQ
What is the operating temperature range for MAX145ACUA+?
The MAX145ACUA+ is specified for operation from 0°C to +70°C (Commercial grade). This range is confirmed in Maxim's official ordering information table and applies to all electrical parameters unless otherwise noted in the datasheet's "ELECTRICAL CHARACTERISTICS" section. The 'A' suffix in MAX145ACUA+ explicitly denotes the 0°C to +70°C temperature grade.
Does MAX145ACUA+ support true differential input mode?
No, MAX145ACUA+ implements pseudo-differential input architecture: it samples only the CH+ (Pin 2) signal while requiring CH− (Pin 3) to remain stable within ±0.5 LSB relative to GND. Unlike true differential ADCs, it does not compute (CH+ − CH−) internally - the CH− pin serves as a quiet reference return, not an active complementary input.
Can MAX145ACUA+ operate without an external reference?
No, MAX145ACUA+ requires an external reference voltage applied to the REF pin. It has no internal reference. The datasheet specifies minimum 18 kΩ input resistance at REF and mandates a 0.1 µF bypass capacitor; reference voltage must be stable to within 1 LSB for accurate 12-bit conversion.
What is the function of the CS/SHDN pin on MAX145ACUA+?
The CS/SHDN pin on MAX145ACUA+ serves dual roles: as an active-low chip-select input (pull low to initiate conversion and enable DOUT) and as an active-high shutdown control (pull high to reduce supply current to 0.2 µA). Its state at the falling edge of CS/SHDN also selects internal vs. external clock mode based on SCLK logic level.
Is MAX145ACUA+ pin-compatible with MAX144 series devices?
Yes, MAX145ACUA+ is pin-compatible with MAX144ACUA+ and other MAX144 variants in the same 8-pin µMAX package. Both share identical pinout, supply requirements, and serial interface timing. However, MAX144 operates in 2-channel single-ended mode, while MAX145 uses pseudo-differential mode - software configuration differs accordingly.
MAX145ACUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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+ FAQ
1.How can I place an order for MAX145ACUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX145ACUA+ 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+ reliable?
The price and inventory of MAX145ACUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX145ACUA+ is usually 5 days.
3.What payment methods are accepted for MAX145ACUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX145ACUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX145ACUA+?
MAX145ACUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX145ACUA+ 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+?
For technical support, including MAX145ACUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX145ACUA+ requirements.
6.How does Aetrix verify that MAX145ACUA+ is sourced from the original manufacturer or authorized distributors?
All MAX145ACUA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX145ACUA+?
All MAX145ACUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX145ACUA+, 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+ part is unused and in its original packaging.
Return procedure for MAX145ACUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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