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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:4,639
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Product details
Overview
MAX1280BEUP from Maxim Integrated is a 12-bit, 400ksps serial analog-to-digital converter with integrated 8-channel multiplexer, track/hold, and internal +2.5V reference. It operates from a single +4.5V to +5.5V supply, supports software-configurable unipolar/bipolar and single-ended/pseudo-differential inputs, and delivers ±1 LSB INL over –40°C to +85°C - enabling high-accuracy data acquisition in portable medical instruments and battery-powered industrial sensors.
For engineers reviewing the MAX1280BEUP datasheet, MAX1280BEUP pinout, MAX1280BEUP application, or MAX1280BEUP equivalent, this page provides verified electrical specs, TSSOP-20 pin mapping, power-mode timing behavior, and real-world ADC interface constraints for SPI/QSPI/MICROWIRE host systems and TMS320 DSPs.
Technical Context
The MAX1280BEUP uses successive-approximation (SAR) architecture with a switched-capacitor DAC and internal track/hold circuit. Its input stage supports pseudo-differential sampling where only IN+ is actively sampled while IN– remains stable within ±0.5 LSB during conversion - requiring careful COM reference management and low-noise layout near REF and REFADJ pins.
It features four software-selectable power modes (normal, reduced-power, fast power-down, full power-down), with automatic wake-up on serial interface access and sub-µs turn-on time. The 4-wire SPI-compatible interface operates at up to 6.4MHz SCLK, delivering 12-bit results in 16 clock cycles, and includes SSTRB strobe for precise TMS320-family synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 4096 discrete output codes with monotonic transfer function and no missing codes over temperature. |
| Sampling Rate | 400ksps - supports real-time capture of signals up to 350kHz full-linear bandwidth with <50ps aperture jitter. |
| INL / DNL | ±1 LSB / ±1.0 LSB - ensures accurate code transitions and linearity-critical applications like sensor calibration and process control. |
| Supply Range | +4.5V to +5.5V - single-supply operation simplifies power design; VDD1 and VDD2 must be matched within ±0.3V. |
| Reference | Internal +2.500V ±0.8% (±15ppm/°C TC) - eliminates external reference component; adjustable via REFADJ pin from 1.22V to VDD1. |
| Power Modes | 2.5mA (normal), 1.3mA (reduced), 0.9mA (fast PD), 2µA (full PD) - enables dynamic current scaling between conversions for ultra-low average power. |
| Operating Temp | –40°C to +85°C - qualified for industrial and extended-temperature embedded systems without derating. |
Pinout & Package
MAX1280BEUP is housed in a 20-pin TSSOP package (4.4mm × 6.5mm, 0.65mm pitch) with exposed pad for thermal performance. Pin numbering follows standard top-view orientation with pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Software-selectable single-ended or pseudo-differential inputs; CH0–CH7 support 8:1 multiplexing with shared COM reference. |
| COM (Pin 9) | Analog ground reference | Sets zero-code voltage in single-ended mode; must remain stable within ±0.5 LSB during conversion to avoid error. |
| SHDN (Pin 10) | Hardware shutdown control | Active-low input; pulls supply current to 2µA typ when asserted - used for coarse power gating independent of software modes. |
| REF (Pin 11) | Reference buffer output / external ref input | Provides +2.500V nominal internal reference; accepts 1V to VDD1 external reference when REFADJ = VDD1. |
| REFADJ (Pin 12) | Reference buffer adjustment | Adjusts internal reference voltage from 1.22V to VDD1; disable buffer by tying to VDD1 - critical for external reference use. |
| GND (Pin 13) | Analog/digital common ground | Single ground plane required; separates analog and digital return paths internally but shares physical pin. |
| DOUT (Pin 14) | Serial data output | 3-state output enabled when CS is low; MSB-first 12-bit result shifted on SCLK rising edge; high-impedance when CS high. |
| SSTRB (Pin 15) | Serial strobe output | Pulses high for one SCLK period before MSB appears on DOUT - synchronizes TMS320-family DSP capture timing. |
| DIN (Pin 16) | Serial data input | Accepts 8-bit control byte defining channel, polarity, and power mode; latched on SCLK rising edge with CS low. |
| CS (Pin 17) | Chip select | Active-low enable; controls DOUT/SSTRB tri-state behavior and initiates serial interface transaction sequence. |
| SCLK (Pin 18) | Serial clock input | Drives conversion timing and data transfer; 6.4MHz max frequency with 40–60% duty cycle; defines 16-clock conversion cycle. |
| VDD2 (Pin 19) | Digital supply | Supplies logic core and serial interface; must match VDD1 within ±0.3V; decoupling required per datasheet layout guidelines. |
| VDD1 (Pin 20) | Analog supply | Supplies analog front-end, track/hold, and reference; same voltage range as VDD2; requires separate 4.7µF + 0.01µF bypass at REF/REFADJ. |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel analog multiplexer + track/hold | Enables rapid scanning across multiple sensors without external signal conditioning; acquisition time ≤468ns ensures minimal inter-channel settling delay. |
| Internal +2.5V reference with ±15ppm/°C TC | Eliminates need for external precision reference IC; REFADJ allows fine-tuning to compensate for system-level gain drift or board-level tolerances. |
| Four software-selectable power modes | Supports adaptive power management - e.g., full power-down between samples in low-duty-cycle logging, reducing average current to <100µA. |
| SPI/QSPI/MICROWIRE/TMS320-compatible interface | Direct connection to microcontrollers and DSPs without level shifters or glue logic; SSTRB strobe enables deterministic sample-to-data-read latency. |
| Pseudo-differential input architecture | Permits differential measurement using CH0/CH1, CH2/CH3, etc., while retaining single-ended simplicity - ideal for ratiometric sensor interfaces with shared excitation. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure at 100Hz intervals over 72-hour deployment. IC Role / Device Role / Timing Role: MAX1280BEUP performs synchronized multi-channel sampling with automatic power-down between conversions to extend battery life. Use Value: 2µA full power-down current and 400ksps capability allow oversampling + digital filtering for noise reduction without increasing system power budget. |
Use Scenario: Handheld ECG monitor acquiring lead-II differential signals with 12-bit resolution and clinical-grade linearity. IC Role / Device Role / Timing Role: MAX1280BEUP acts as front-end ADC with pseudo-differential CH0/CH1 input, referenced to stable COM node for common-mode rejection. Use Value: ±1 LSB INL and <50ps aperture jitter ensure diagnostic accuracy per IEC 60601-2-27; internal reference removes external component drift risk. |
| Battery-Powered Test Equipment | Industrial Process Control |
Use Scenario: Portable multimeter measuring DC voltage, current, and resistance with auto-ranging and 12-bit digitization. IC Role / Device Role / Timing Role: MAX1280BEUP serves as main ADC with software-configurable unipolar/bipolar input and internal reference for ratiometric scaling. Use Value: Single +5V supply simplifies power architecture; 4.5V–5.5V operating range maintains accuracy as battery discharges from 5.2V to 4.6V. |
Use Scenario: PLC analog input module digitizing 4–20mA loop signals from pressure transmitters across eight field channels. IC Role / Device Role / Timing Role: MAX1280BEUP implements isolated channel scanning using CH0–CH7 with COM tied to loop return, supporting HART communication overlay. Use Value: 8-channel integration reduces component count vs. discrete ADCs; ±0.1 LSB channel-to-channel offset matching minimizes calibration overhead. |
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; SPI-only interface; 8-pin SOIC. | Lacks integrated reference and multiplexer; requires external REF and signal routing; lower speed limits high-frequency transient capture. | Choose when board space is constrained and external reference already exists; not drop-in due to pin count and feature gap. |
| AD7490BRUZ | 12-bit, 1MSPS, 16-channel, internal reference; SPI interface; 24-pin TSSOP; wider supply (2.7V–5.25V). | Higher channel count and speed, but larger package and higher typical supply current (3.5mA vs. 2.5mA at 400ksps). | Prefer for systems needing >8 channels or >400ksps; pinout and register map differ - PCB redesign required. |
Compared with ADS7822U and AD7490BRUZ, the MAX1280BEUP uniquely balances 8-channel integration, internal reference, 400ksps throughput, and ultra-low full power-down current (2µA) in a compact 20-pin TSSOP - making it optimal for space- and power-constrained industrial data loggers where reference stability and channel flexibility are critical.
Availability
MAX1280BEUP is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-powered test equipment requiring stable component supply across industrial temperature ranges.
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) designs precision analog and mixed-signal ICs for industrial, medical, and communications applications - emphasizing low power, high accuracy, and system-level integration.
The MAX1280BEUP belongs to Maxim's high-speed, low-power SAR ADC product line, engineered specifically for battery-operated and thermally constrained systems needing reliable 12-bit digitization without external reference or multiplexer components.
FAQ
What is the maximum serial clock frequency supported by the MAX1280BEUP?
The MAX1280BEUP supports a maximum serial clock (SCLK) frequency of 6.4MHz under standard operating conditions (+4.5V to +5.5V, TA = –40°C to +85°C). At this rate, each 12-bit conversion completes in 16 clock cycles, achieving the full 400ksps sampling rate. Exceeding 6.4MHz may violate setup/hold timing margins and degrade AC performance such as SINAD or SFDR.
Does the MAX1280BEUP require an external reference, or can it operate with its internal reference?
The MAX1280BEUP can operate with its internal +2.500V reference (typical ±0.8% initial accuracy, ±15ppm/°C TC) and does not require an external reference. The internal reference is enabled by default; to use an external reference, tie REFADJ to VDD1 to disable the reference buffer and apply 1V to VDD1 at the REF pin - verified in the MAX1280BEUP datasheet Section "EXTERNAL REFERENCE".
How does the pseudo-differential input mode work on the MAX1280BEUP?
In pseudo-differential mode, the MAX1280BEUP samples only the positive input (IN+) while holding the negative input (IN–) stable - unlike true differential ADCs that sample both nodes. Valid pairs are CH0/CH1, CH2/CH3, CH4/CH5, and CH6/CH7. IN– must remain within ±0.5 LSB of its setpoint (e.g., COM or VREF/2) during conversion; violating this causes measurable INL error.
What is the purpose of the SSTRB pin on the MAX1280BEUP, and how is it used?
The SSTRB (serial strobe) pin on the MAX1280BEUP pulses high for exactly one SCLK period immediately before the MSB of the 12-bit conversion result appears on DOUT. This strobe provides precise timing alignment for TMS320-family DSPs and other controllers needing deterministic sample-to-data-read synchronization - eliminating software polling or uncertain interrupt latency in time-critical acquisition loops.
Can the MAX1280BEUP operate from a single 3.3V supply?
No - the MAX1280BEUP is specified only for +4.5V to +5.5V operation (VDD1 = VDD2). For 3.3V-compatible operation, the pin-compatible MAX1281BEUP variant must be used instead, which operates from +2.7V to +3.6V and delivers 300ksps. Using 3.3V on MAX1280BEUP violates Absolute Maximum Ratings and will result in undefined behavior or permanent damage.
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:
- Obsolete
- 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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