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Analog Devices Inc./Maxim Integrated MAX1280BEUP+
- Part No.:
- MAX1280BEUP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX1280BEUP+.pdf
- Description:
- IC ADC 12BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,630
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Product details
Overview
The MAX1280BEUP+ from Maxim Integrated is a 12-bit, 8-channel serial analog-to-digital converter (ADC) with integrated track/hold, multiplexer, and internal +2.5V reference. It operates from a single +4.5V to +5.5V supply, delivers 400ksps sampling rate, supports software-configurable unipolar/bipolar and single-ended/pseudo-differential inputs, and targets portable data acquisition systems requiring low power and high channel density.
For engineers reviewing the MAX1280BEUP+ datasheet, MAX1280BEUP+ pinout, MAX1280BEUP+ application, or MAX1280BEUP+ equivalent, this page provides verified electrical specifications, TSSOP-20 pin mapping, real-world use cases in battery-powered instrumentation, and validated alternative parts for design flexibility and supply continuity.
Technical Context
The MAX1280BEUP+ uses successive-approximation register (SAR) architecture with an on-chip track/hold and 8:1 analog multiplexer. Its conversion timing is clocked by an external SCLK (up to 6.4MHz), requiring 16 clock cycles per 12-bit result, with aperture jitter <50ps and acquisition time of 468ns.
It features four software-selectable power modes - normal (2.5mA), reduced-power (1.3mA), fast power-down (0.9mA), and full power-down (2µA) - with automatic wake-up via serial interface access and guaranteed ±1 LSB INL over –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for precision measurement applications. |
| Sampling Rate | 400ksps - supports real-time capture of signals up to 200kHz bandwidth without aliasing. |
| INL | ±1 LSB - ensures monotonicity and end-point linearity critical for closed-loop control feedback. |
| Supply Voltage | +4.5V to +5.5V - compatible with standard 5V logic rails and industrial power domains. |
| Operating Temperature | –40°C to +85°C - qualified for extended-temperature industrial and automotive-adjacent environments. |
| Reference | Internal +2.500V ±1.5% adjustable - eliminates need for external reference IC in space-constrained designs. |
| Interface | SPI/QSPI/MICROWIRE-compatible 4-wire serial - enables direct connection to microcontrollers without level-shifting or glue logic. |
Pinout & Package
MAX1280BEUP+ is housed in a 20-pin TSSOP package (4.4mm × 6.5mm, 0.65mm pitch), optimized for compact PCB layouts and thermal performance in portable instrumentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD1, VDD2 | Positive supply inputs | Separate analog/digital supplies reduce noise coupling; both require +4.5V to +5.5V for MAX1280BEUP+ operation. |
| GND | Analog and digital ground | Single common ground plane required; COM must be stable to ±0.5LSB for accurate zero-code alignment. |
| CH0–CH7 | Analog input channels | 8 single-ended or 4 pseudo-differential inputs; input voltage range is GND to VDD1 (0V to +5.5V). |
| COM | Common-mode reference | Sets zero-code voltage in single-ended mode; must remain stable within ±0.5LSB during conversion. |
| REF, REFADJ | Reference buffer I/O | REF outputs +2.500V nominal; REFADJ allows ±1.5% adjustment or disables buffer when tied to VDD1. |
| CS, SCLK, DIN, DOUT, SSTRB | Serial interface signals | 4-wire SPI-compatible interface; SSTRB pulses before MSB to synchronize DSP capture (e.g., TMS320). |
| SHDN | Hardware shutdown control | Active-low pin reduces supply current to 2µA; overrides software power modes for rapid system-level power gating. |
Key Features
| Feature | Design Value |
|---|---|
| Pseudo-differential input architecture | Supports 4 differential pairs (CH0/CH1, CH2/CH3, etc.) while retaining single-ended simplicity and layout efficiency. |
| Four software-selectable power modes | Enables dynamic current scaling from 2.5mA (full speed) down to 2µA (full shutdown), extending battery life in portable instruments. |
| Internal reference with ±1.5% adjustability | Reduces BOM count and board area; REFADJ pin allows fine-tuning to compensate for system-level gain drift. |
| Track/hold acquisition time ≤468ns | Permits accurate sampling of fast transients; minimal dead time between conversions improves effective throughput. |
| TSSOP-20 RoHS-compliant package | Enables high-density routing with 0.65mm pitch; lead-free finish meets global environmental compliance requirements. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
Use Scenario: Battery-powered environmental sensor node logging temperature, humidity, and pressure at 100Hz intervals over 72-hour deployments. IC Role / Device Role / Timing Role: ADC front-end digitizing 8 analog sensor outputs sequentially with auto-channel sequencing and low idle current. Use Value: 2µA full power-down mode extends battery life; internal reference eliminates calibration drift across temperature gradients. |
Use Scenario: Portable ECG monitor acquiring lead-II and lead-III differential signals with simultaneous respiration and SpO₂ analog inputs. IC Role / Device Role / Timing Role: High-accuracy 12-bit digitizer supporting pseudo-differential inputs and bipolar operation for biopotential signal conditioning. Use Value: ±1 LSB INL ensures diagnostic-grade waveform fidelity; 400ksps sampling captures QRS complex morphology without undersampling artifacts. |
| Battery-Powered Test Equipment | Industrial Process Control |
Use Scenario: Handheld multimeter with 8-channel analog sensing for voltage, current, and resistance measurements using shared front-end circuitry. IC Role / Device Role / Timing Role: Multiplexed ADC managing multiple input ranges and signal paths under microcontroller control. Use Value: Software-configurable unipolar/bipolar mode simplifies firmware handling of AC/DC inputs; 1.3mA reduced-power mode balances speed and energy use. |
Use Scenario: PLC analog input module monitoring 8 field sensors (4–20mA loops, thermocouples, RTDs) in factory automation cabinets. IC Role / Device Role / Timing Role: Precision digitizer interfacing with isolated signal conditioners and providing synchronized multi-channel sampling. Use Value: –40°C to +85°C rating ensures reliability in uncontrolled industrial enclosures; 6.4MHz SCLK tolerance supports deterministic scan cycle timing. |
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 | 12-bit, 200ksps, single-supply +2.7V to +5.25V; no internal reference; requires external REF. | Lacks integrated reference and track/hold; needs additional support components for equivalent functionality. | Choose when external reference precision or lower supply voltage (<4.5V) is mandatory, and board space permits added components. |
| MAX11100ETK+ | 12-bit, 500ksps, 8-channel, internal 2.048V reference; operates from +2.7V to +3.6V only. | Higher speed but incompatible supply range; not rated for –40°C to +85°C industrial operation. | Prefer for 3.3V-only systems needing faster sampling, but verify temperature compliance and reference voltage compatibility. |
Compared with ADS7822U and MAX11100ETK+, the MAX1280BEUP+ uniquely combines 400ksps speed, internal +2.5V reference, 5V supply compatibility, and extended temperature qualification - making it optimal for ruggedized, space-constrained, single-supply data loggers and portable medical devices.
Availability
MAX1280BEUP+ is available at Aetrix Electronics and suitable for portable data logging, battery-powered test equipment, and industrial process control applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1280BEUP+ 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 MAX1280BEUP+ belongs to Maxim's precision data acquisition product line, designed specifically for low-power, multi-channel, single-supply systems where integration, accuracy, and temperature robustness are critical.
FAQ
What is the maximum sampling rate of the MAX1280BEUP+?
The MAX1280BEUP+ achieves a maximum sampling rate of 400ksps under specified conditions: VDD1 = VDD2 = +4.5V to +5.5V, fSCLK = 6.4MHz, and 16 clock cycles per conversion. This rate is maintained across its full operating temperature range of –40°C to +85°C, with guaranteed timing parameters including tCONV ≤2.5µs and tACQ ≤468ns.
Does the MAX1280BEUP+ include an internal voltage reference?
Yes, the MAX1280BEUP+ integrates a precision +2.500V reference with ±1.5% adjustability via the REFADJ pin. The reference buffer can be disabled by tying REFADJ to VDD1, allowing use of an external reference from 1V to VDD1. This dual-reference capability simplifies design flexibility while maintaining DC accuracy of ±6.0 LSB gain error and ±7.0 LSB offset error.
What power modes does the MAX1280BEUP+ support?
The MAX1280BEUP+ offers four software-selectable power modes: normal operation (2.5mA), reduced-power mode (1.3mA), fast power-down (0.9mA), and full power-down (2µA). Power mode selection is controlled by PD1/PD0 bits in the control byte. Hardware shutdown via the SHDN pin forces full power-down independently of software state, enabling rapid system-level power gating.
Is the MAX1280BEUP+ compatible with SPI microcontrollers?
Yes, the MAX1280BEUP+ implements a 4-wire SPI/QSPI/MICROWIRE-compatible serial interface. It requires CPOL = 0 and CPHA = 0 configuration on the host controller. Data is clocked on the rising edge of SCLK, with CS active-low enabling communication. The SSTRB strobe output aligns with the MSB for precise timing-critical capture in DSP-based systems like TMS320-family processors.
What is the input voltage range for analog channels on the MAX1280BEUP+?
The analog input voltage range for CH0–CH7 and COM on the MAX1280BEUP+ is GND to VDD1 (0V to +5.5V). In unipolar single-ended mode, inputs must stay within GND to VDD1; in bipolar mode, the range is ±VREF/2 referenced to COM. For accurate full-scale conversion, inputs should not exceed GND –50mV or VDD1 +50mV to avoid clipping or damage from internal protection diodes.
MAX1280BEUP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 400k
- Number of Inputs:
- 4, 8
- Input Type:
- Pseudo-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, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1280BEUP+ FAQ
1.How can I place an order for MAX1280BEUP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1280BEUP+ 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 MAX1280BEUP+ reliable?
The price and inventory of MAX1280BEUP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1280BEUP+ is usually 5 days.
3.What payment methods are accepted for MAX1280BEUP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1280BEUP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1280BEUP+?
MAX1280BEUP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1280BEUP+ 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 MAX1280BEUP+?
For technical support, including MAX1280BEUP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1280BEUP+ requirements.
6.How does Aetrix verify that MAX1280BEUP+ is sourced from the original manufacturer or authorized distributors?
All MAX1280BEUP+ 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 MAX1280BEUP+ meets industry standards.
7.What is the process for return or replacement of MAX1280BEUP+?
All MAX1280BEUP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1280BEUP+, 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 MAX1280BEUP+ part is unused and in its original packaging.
Return procedure for MAX1280BEUP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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