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Analog Devices Inc./Maxim Integrated MAX1287ETA+T
- Part No.:
- MAX1287ETA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX1287ETA+T.pdf
- Description:
- IC ADC 12BIT SAR 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,955
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Product details
Overview
MAX1287ETA+T from Maxim Integrated is a 12-bit, 150ksps successive-approximation ADC with true-differential analog input, single +3V supply operation (2.7V–3.6V), and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface. It features auto-shutdown (0.2µA), 1.4µs acquisition time, and operates in TDFN-EP package for portable data-acquisition systems requiring low power and minimal board space.
For engineers reviewing the MAX1287ETA+T datasheet, MAX1287ETA+T pinout, MAX1287ETA+T application, or MAX1287ETA+T equivalent, this page delivers verified technical context, real-world timing behavior, differential input configuration details, and validated alternative options for battery-powered sensor interfaces and precision analog front-ends.
Technical Context
The MAX1287ETA+T implements a SAR architecture with integrated track-and-hold, supporting true-differential input (AIN+ / AIN−) referenced to VREF = +2.5V. Its internal conversion clock (±10% accuracy) eliminates external timing components, enabling deterministic 3.7µs conversion time independent of host processor clocking.
Conversion initiation and mode selection are controlled solely via CNVST pin timing: unipolar/bipolar polarity (for MAX1288/MAX1289) or channel selection (for MAX1286/MAX1287) is determined by CNVST pulse width and edge sequence - no register writes required. The device enters AutoShutdown between conversions without software intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = VREF/4096 quantization step for ±0.5LSB DNL monotonic output. |
| Sampling Rate | 150ksps maximum - supports continuous high-speed acquisition of DC-coupled sensor signals up to 100kHz full-linear bandwidth. |
| Supply Voltage | +2.7V to +3.6V - enables direct integration with 3V microcontrollers and Li-ion battery systems without LDO overhead. |
| Power Consumption | 245µA at 150ksps, 0.2µA in AutoShutdown - reduces average current in duty-cycled measurement systems by >1000×. |
| Differential Input Range | 0V to VREF (unipolar) or ±VREF/2 (bipolar) - accepts true-differential transducer outputs without external level-shifting circuitry. |
| SINAD / SFDR | 70dB / 86dB at 10kHz - ensures ≥11.3 effective bits for precision temperature or pressure sensing applications. |
| Reference Input | VREF = +2.5V (typical), range +1.0V to VDD+50mV - allows use of stable external references or internal bandgap-derived sources. |
Pinout & Package
MAX1287ETA+T is housed in an 8-pin TDFN-EP package (3mm × 3mm, 0.75mm height) with exposed pad (EP) for thermal enhancement and low-inductance ground connection. Pin 1 is marked with top-side laser etch "+AFN".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDD | Positive Supply | +2.7V to +3.6V analog/digital rail; requires local 0.1µF ceramic bypass to GND. |
| 2 AIN+ | Differential Positive Input | Accepts signal up to VDD+50mV; clamped internally to VDD/GND; used with AIN− for true-differential sampling. |
| 3 AIN− | Differential Negative Input | Reference input for differential pair; must remain within GND−0.3V to VDD+0.3V for ESD protection integrity. |
| 4 GND | Analog/Digital Ground | Common reference for VDD, REF, and analog inputs; connect EP pad directly to this node for optimal noise performance. |
| 5 REF | External Reference Input | Defines full-scale range; bypass with 0.1µF capacitor; supports 1.0V–(VDD+50mV) voltage sources. |
| 6 CNVST | Conversion Start & Mode Control | Rising edge powers up IC and initiates track mode; falling edge triggers hold/conversion; pulse width selects unipolar/bipolar mode. |
| 7 DOUT | Serial Data Output | MSB-first, SPI-compatible; transitions on SCLK falling edge; goes high-impedance after 12-bit read completes. |
| 8 SCLK | Serial Clock Input | Host-provided clock up to 8MHz; determines data transfer rate; no internal clock generation required for interface timing. |
Key Features
| Feature | Design Value |
|---|---|
| True-differential input architecture | Rejects common-mode noise up to 0.1mV over 0V–VDD input range, enabling direct connection to bridge sensors and isolated amplifiers. |
| AutoShutdown between conversions | Reduces quiescent current to 0.2µA without firmware control, eliminating standby power management code in ultra-low-power firmware. |
| Internal conversion clock | Removes need for external crystal or oscillator; guarantees 3.7µs max conversion time regardless of host clock stability or frequency. |
| 3-wire SPI/QSPI/MICROWIRE compatibility | Interoperates with standard MCU peripherals (e.g., PIC SSP, ARM SPI) using CPOL=0/CPHA=0 mode; no custom driver logic required. |
| 1.4µs acquisition time | Supports source impedances ≤300Ω without performance degradation; simplifies anti-alias filter design and sensor interface layout. |
Applications
| Portable Temperature Monitors | Flowmeters |
|---|---|
|
Use Scenario: Battery-powered handheld thermometers measuring RTD or thermistor outputs in field service tools. IC Role / Device Role / Timing Role: True-differential ADC digitizing ratiometric bridge signals while rejecting EMI from nearby motors or RF sources. Use Value: 70dB SINAD and 0.2µA shutdown current extend battery life beyond 12 months in 1-sample-per-minute logging mode. |
Use Scenario: Ultrasonic or magnetic flow sensors in industrial process controllers requiring high-resolution analog front-end. IC Role / Device Role / Timing Role: Precision digitizer for differential voltage outputs from flow transducers, operating at 100ksps with <50ps aperture jitter. Use Value: 86dB SFDR enables detection of small flow variations amid high-noise plant-floor environments without external filtering. |
| Touch Screens | Low-Power Data Acquisition |
|
Use Scenario: Resistive touch screen controllers in medical tablets where ESD robustness and low active power are critical. IC Role / Device Role / Timing Role: Dual-channel single-ended ADC (shared with MAX1286 family) sampling X/Y electrode voltages with 12-bit linearity. Use Value: 1.4µs acquisition time supports fast touch response (<10ms latency); 245µA active current minimizes display backlight interference. |
Use Scenario: Remote environmental sensor nodes monitoring humidity, pressure, and gas concentration on coin-cell batteries. IC Role / Device Role / Timing Role: Core analog-to-digital converter in energy-harvesting systems, triggered by wake-up interrupts and auto-shutting down post-read. Use Value: 0.2µA shutdown current enables multi-year deployment; SPI interface allows direct connection to sub-GHz wireless SoCs without glue logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit differential ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7816U | 8-pin SOIC package; 200ksps max; requires external reference; no AutoShutdown (1.2mA typical) | Better SNR (72dB) but higher power; suited for AC-coupled test equipment, not battery operation | Select when board space is unconstrained and higher sampling rate justifies increased supply current. |
| AD7476ARTZ-REEL7 | Single-ended input only; 1MSPS; 2.35V–5.25V supply; SPI-compatible; 350nA shutdown | Lacks true-differential capability; optimized for high-speed single-ended sensor arrays | Choose for cost-sensitive, high-throughput applications where differential rejection is handled upstream. |
Compared with ADS7816U and AD7476ARTZ-REEL7, MAX1287ETA+T uniquely combines true-differential input, 0.2µA AutoShutdown, and TDFN-EP packaging - making it the only option among the three that meets simultaneous requirements for portable size, battery longevity, and noise-immune transducer interfacing.
Availability
MAX1287ETA+T is available at Aetrix Electronics and suitable for portable temperature monitors, flowmeters, and low-power data-acquisition systems requiring stable component supply across extended production lifecycles.
Supply support for MAX1287ETA+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 MAX1286–MAX1289 family was engineered specifically for ultra-low-power, space-constrained data-acquisition systems - delivering 12-bit resolution with differential input capability in sub-3mm² packages without sacrificing dynamic performance.
FAQ
What is the maximum sampling rate of the MAX1287ETA+T?
The MAX1287ETA+T achieves a maximum sampling rate of 150ksps under specified conditions (VDD = +2.7V to +3.6V, VREF = +2.5V, fSCLK = 8MHz). At this rate, supply current is 245µA, and full-linear bandwidth remains at 100kHz. Sampling above 150ksps is not guaranteed per datasheet specifications.
Does the MAX1287ETA+T require an external reference voltage?
Yes, the MAX1287ETA+T requires an external reference voltage applied to the REF pin. The device supports VREF from +1.0V to VDD+50mV; +2.5V is the typical value used for full-scale calibration. A 0.1µF ceramic capacitor must be placed directly between REF and GND for optimal noise rejection and linearity.
How does the MAX1287ETA+T handle differential input polarity selection?
The MAX1287ETA+T supports both unipolar and bipolar differential modes via CNVST pin timing. A single CNVST pulse selects unipolar mode (AIN+ − AIN− = 0 to +VREF); a double-pulse (high–low–high) selects bipolar mode (−VREF/2 to +VREF/2). This hardware-based selection eliminates register programming and ensures deterministic mode switching.
What is the function of the exposed pad (EP) on the MAX1287ETA+T TDFN package?
The exposed pad (EP) on the MAX1287ETA+T serves as a low-thermal-resistance path to GND and improves high-frequency noise immunity. Maxim recommends soldering EP directly to a solid GND plane on the PCB. Leaving it unconnected degrades thermal performance and may increase susceptibility to digital switching noise during conversion.
Can the MAX1287ETA+T operate with a 5V supply?
No, the MAX1287ETA+T is rated exclusively for +2.7V to +3.6V operation. It belongs to the +3V-supply variant of the MAX1286–MAX1289 family (MAX1287/MAX1289). Using 5V violates absolute maximum ratings and risks permanent damage. For +5V systems, the pin-compatible MAX1286ETA+T or MAX1286EKA-T should be selected instead.
MAX1287ETA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 150k
- Number of Inputs:
- 2
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- 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 ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-TDFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1287ETA+T FAQ
1.How can I place an order for MAX1287ETA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1287ETA+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 MAX1287ETA+T reliable?
The price and inventory of MAX1287ETA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1287ETA+T is usually 5 days.
3.What payment methods are accepted for MAX1287ETA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1287ETA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1287ETA+T?
MAX1287ETA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1287ETA+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 MAX1287ETA+T?
For technical support, including MAX1287ETA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1287ETA+T requirements.
6.How does Aetrix verify that MAX1287ETA+T is sourced from the original manufacturer or authorized distributors?
All MAX1287ETA+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 MAX1287ETA+T meets industry standards.
7.What is the process for return or replacement of MAX1287ETA+T?
All MAX1287ETA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1287ETA+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 MAX1287ETA+T part is unused and in its original packaging.
Return procedure for MAX1287ETA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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