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Analog Devices Inc./Maxim Integrated MAX1288EKA
- Part No.:
- MAX1288EKA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-8
- Datasheet:
-
MAX1288EKA.pdf
- Description:
- 12-BIT TRUE-DIFFERENTIAL ADC
- Quantity:
- Payment:
- Shipping:
Inventory:3,227
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Product details
Overview
The MAX1288EKA from Maxim Integrated is a 12-bit, true-differential successive-approximation ADC operating from a single +5V supply, delivering 150ksps sampling rate, ±1.0 LSB INL, and 70dB SINAD at 10kHz input - optimized for low-noise, space-constrained portable data acquisition systems requiring precise differential signal digitization.
For engineers reviewing the MAX1288EKA datasheet, MAX1288EKA pinout, MAX1288EKA application, or MAX1288EKA equivalent, this page delivers verified electrical specs, SOT23-8 pin mapping, unipolar/bipolar software-configurable operation, and real-world use cases in touch screens and flowmeters - all confirmed against Maxim's official 19-2231 Rev 2 datasheet.
Technical Context
The MAX1288EKA implements a true-differential track-and-hold with 150kHz effective input bandwidth and supports both unipolar (straight binary) and bipolar (two's complement) output formats selected via CNVST timing. Its internal 4MHz oscillator enables consistent 3.7µs conversion time without external clock dependency.
It features SPI/QSPI/MICROWIRE-compatible 3-wire serial interface (DOUT, SCLK, CNVST), 245µA supply current at full 150ksps rate, and AutoShutdown™ reducing quiescent current to 0.2µA between conversions - all within an 8-pin SOT23 package rated for -40°C to +85°C operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital levels for high-fidelity analog signal capture. |
| Sampling Rate | 150ksps - supports real-time monitoring of fast transients in portable sensor interfaces. |
| INL / DNL | ±1.0 LSB / ±1.0 LSB - ensures monotonicity and end-point linearity critical for precision measurement. |
| SINAD | 70 dB at 10kHz - enables accurate digitization of low-amplitude signals in noisy environments. |
| Supply Current | 245 µA at 150ksps, 0.2 µA in AutoShutdown - extends battery life in handheld instruments. |
| Input Type | True-differential (AIN+, AIN-) - rejects common-mode noise and supports bipolar/unipolar modes. |
| Reference Input | External VREF = +4.096V (typical) - allows system-level scaling and accuracy control. |
Pinout & Package
MAX1288EKA is housed in an 8-pin SOT23-8 package (top mark AAFC, pkg code K8F-4), with exposed pad not electrically connected. Thermal resistance θJA = 103°C/W; derating begins above +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Positive supply input | +4.75V to +5.25V power rail; requires 0.1µF bypass capacitor to GND for noise suppression. |
| 2 - AIN+ | Differential positive analog input | Accepts signal up to VDD + 50mV; paired with AIN- for true-differential acquisition. |
| 3 - AIN- | Differential negative analog input | Completes differential pair; must remain within GND − 0.3V to VDD + 0.3V for ESD safety. |
| 4 - GND | Analog/digital ground reference | Single-point star ground connection required; separates analog and digital return paths. |
| 5 - REF | External reference voltage input | Accepts +1.0V to VDD + 50mV; 0.1µF bypass cap mandatory for stable full-scale accuracy. |
| 6 - CNVST | Conversion start and mode select | Rising edge powers up device; falling edge triggers hold/conversion; pulse width configures unipolar/bipolar mode. |
| 7 - DOUT | Serial data output | MSB-first, 12-bit output; transitions on SCLK falling edge; goes high-impedance after full read. |
| 8 - SCLK | Serial clock input | Accepts 0–8MHz clock; 50% duty cycle required; controls data timing for SPI/QSPI/MICROWIRE compatibility. |
Key Features
| Feature | Design Value |
|---|---|
| True-differential T/H architecture | Enables 150kHz input bandwidth and >86dB SFDR by rejecting common-mode interference in sensor front-ends. |
| Software-configurable unipolar/bipolar mode | Eliminates external level-shifting circuitry - polarity selection via CNVST timing reduces BOM count and layout complexity. |
| AutoShutdown™ between conversions | Reduces average current to sub-µA levels at low throughput rates, extending battery runtime in intermittent-sampling applications. |
| Internal 4MHz conversion clock | Removes need for external timing components and decouples conversion timing from host processor clock domain. |
| SPI/QSPI/MICROWIRE-compatible interface | Direct plug-in support for industry-standard microcontroller serial peripherals without protocol translation logic. |
Applications
| Portable Temperature Monitors | Flowmeters |
|---|---|
|
Use Scenario: Battery-powered handheld thermometers measuring thermocouple or RTD outputs in field service environments. IC Role / Device Role / Timing Role: True-differential ADC digitizing low-level mV-range thermal signals while rejecting EMI from nearby motors or RF sources. Use Value: ±1.0 LSB INL and 70dB SINAD ensure <0.1°C measurement resolution over full industrial temperature range. |
Use Scenario: Ultrasonic or magnetic flow sensors in smart water meters requiring low-power, high-accuracy analog front-end. IC Role / Device Role / Timing Role: Digitizing differential voltage from flow transducers with minimal offset drift across temperature (-40°C to +85°C). Use Value: Channel-to-channel gain matching ±0.1 LSB and ±0.4 ppm/°C gain TC enable repeatable flow calibration without per-unit trimming. |
| Touch Screens | Low-Power Data Acquisition |
|
Use Scenario: Resistive touch overlay controllers in medical tablets where EMI immunity and battery life are critical. IC Role / Device Role / Timing Role: Sampling X/Y electrode voltage differentials during stylus contact with auto-acquisition timing controlled by CNVST. Use Value: 1.4µs acquisition time and 3.7µs conversion enable >200Hz touch update rate while consuming only 245µA at full speed. |
Use Scenario: Remote environmental sensor nodes logging vibration, pressure, or humidity using coin-cell batteries. IC Role / Device Role / Timing Role: Performing burst-mode sampling at 1ksps (2µA IDD) then entering AutoShutdown until next wake event. Use Value: 0.2µA shutdown current and software-selectable sampling rate allow multi-year operation on a single CR2032 cell. |
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, 100ksps max, no AutoShutdown, requires external clock | Lacks integrated oscillator and power management; suited for fixed-rate, non-battery systems | Choose when board space permits SOIC and system clock is already available. |
| MAX11100ETE+ | 16-bit resolution, 250ksps, TDFN-16, +3V supply only, no unipolar/bipolar software select | Higher resolution but larger footprint and fixed 3V operation limits supply flexibility | Choose when 16-bit precision is mandatory and +5V operation is required for legacy compatibility. |
Compared with ADS7816U and MAX11100ETE+, the MAX1288EKA uniquely combines +5V operation, true-differential 12-bit performance, software-configurable polarity, and ultra-low 0.2µA shutdown - making it optimal for compact, battery-powered differential sensing where supply voltage and pin count are constrained.
Availability
MAX1288EKA is available at Aetrix Electronics and suitable for portable temperature monitors, flowmeters, and touch screens requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX1288EKA 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 portable applications.
The MAX1286–MAX1289 family was engineered specifically for micropower, space-constrained data acquisition - emphasizing true-differential input fidelity, single-supply operation, and seamless microcontroller integration via standard serial interfaces.
FAQ
What supply voltage range does the MAX1288EKA support?
The MAX1288EKA operates from a single +4.75V to +5.25V supply. It is not compatible with +3V operation - that specification applies only to the MAX1287/MAX1289 variants. The MAX1288EKA requires a 0.1µF bypass capacitor directly at the VDD pin to GND for stable performance.
How does the MAX1288EKA implement true-differential input?
The MAX1288EKA uses dedicated AIN+ and AIN- pins connected to a matched switched-capacitor track-and-hold circuit. At the falling edge of CNVST, it samples the voltage difference (AIN+ − AIN−) and converts it to a 12-bit result - supporting both unipolar (0 to VREF) and bipolar (±VREF/2) ranges based on CNVST timing.
Does the MAX1288EKA require an external clock for conversion?
No. The MAX1288EKA contains an internal 4MHz oscillator accurate to ±10%, enabling consistent 3.7µs conversion time without external timing components. The SCLK pin is used solely for serial data readout and accepts 0–8MHz clocks - it does not drive the conversion process.
What is the purpose of the CNVST pin beyond starting conversion?
On the MAX1288EKA, CNVST serves dual functions: its rising edge powers up the device and initiates tracking, while its pulse width determines unipolar vs. bipolar mode. A short pulse (≥30ns low then high) selects bipolar; a sustained high level selects unipolar - eliminating need for configuration registers or additional control lines.
Can the MAX1288EKA interface directly with a PIC16 microcontroller?
Yes. The MAX1288EKA is fully compatible with PIC16 SSP modules configured in SPI master mode (CPOL=0, CPHA=0). Two consecutive 8-bit reads retrieve the full 12-bit result, with DOUT transitioning on SCLK falling edge and data latched on rising edge - matching PIC16 timing requirements per Maxim Application Note 19-2231.
MAX1288EKA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 150
- Number of Inputs:
- 1
- Input Type:
- Differential, Single Ended
- Data Interface:
- 3-Wire Serial, Microwire, QSPI, 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:
- 4.75V ~ 5.25V
- Voltage - Supply, Digital:
- 4.75V ~ 5.25V
- Features:
- Internal Oscillator
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- SOT-23-8
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1288EKA FAQ
1.How can I place an order for MAX1288EKA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1288EKA 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 MAX1288EKA reliable?
The price and inventory of MAX1288EKA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1288EKA is usually 5 days.
3.What payment methods are accepted for MAX1288EKA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1288EKA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1288EKA?
MAX1288EKA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1288EKA 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 MAX1288EKA?
For technical support, including MAX1288EKA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1288EKA requirements.
6.How does Aetrix verify that MAX1288EKA is sourced from the original manufacturer or authorized distributors?
All MAX1288EKA 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 MAX1288EKA meets industry standards.
7.What is the process for return or replacement of MAX1288EKA?
All MAX1288EKA units undergo pre-shipment inspection (PSI). If there is an issue with MAX1288EKA, 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 MAX1288EKA part is unused and in its original packaging.
Return procedure for MAX1288EKA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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