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Analog Devices Inc./Maxim Integrated MAX1088EKA
- Part No.:
- MAX1088EKA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-8
- Datasheet:
-
MAX1088EKA.pdf
- Description:
- 10-BIT, TRUE-DIFFERENTIAL ADC
- Quantity:
- Payment:
- Shipping:
Inventory:2,283
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Product details
Overview
The MAX1088EKA from Maxim Integrated is a 10-bit, true-differential successive-approximation analog-to-digital converter (SAR ADC) in an 8-pin SOT23 package, operating from a single +5V supply. It delivers 150ksps sampling rate, ±1.0 LSB INL, and 61dB SINAD at 10kHz input, with AutoShutdown current of 0.2µA - optimized for portable battery-powered data acquisition where precision, low power, and space constraints are critical.
For engineers reviewing the MAX1088EKA datasheet, MAX1088EKA pinout, MAX1088EKA application, or MAX1088EKA equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternative options, and supply support tailored for embedded sensor systems requiring differential input rejection and sub-µA standby operation.
Technical Context
The MAX1088EKA implements a true-differential track-and-hold architecture with internal conversion clock, enabling accurate digitization of differential signals ranging from 0 to VREF (up to +4.096V). Its CNVST-controlled polarity selection supports both unipolar (straight binary) and bipolar (two's complement) output formats without external logic.
It features SPI/QSPI/MICROWIRE-compatible 3-wire serial interface (DOUT, SCLK, CNVST), operates with internal oscillator (±10% accuracy), and achieves 1.4µs acquisition time and 3.7µs conversion time - all while maintaining 200µA supply current at full 150ksps throughput under +5V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR - delivers 1024 discrete output codes with monotonic transfer function and no missing codes over temperature. |
| Sampling Rate | 150ksps maximum - supports real-time capture of signals up to 100kHz full-linear bandwidth (SINAD >56dB). |
| Differential Input Range | 0V to VREF (up to +4.096V) - enables high CMR measurement of small differential signals superimposed on large common-mode voltages. |
| INL / DNL | ±1.0 LSB INL and ±1.0 LSB DNL - ensures <0.1% end-point linearity error and guaranteed monotonicity across full temperature range. |
| Supply Current | 200µA at 150ksps, 0.2µA in AutoShutdown - reduces average power to ~1µW in burst-sampling applications with 1ksps effective rate. |
| SPI Interface Speed | Up to 8MHz SCLK - allows full 12-bit readout (10 data + 2 sub-bits) in <1.5µs, compatible with standard microcontroller SPI peripherals. |
| Reference Input | External REF pin accepts +1.0V to VDD+50mV - supports flexible scaling with precision external references or internal LDO-derived sources. |
Pinout & Package
Package: 8-pin SOT23 (top mark AAFB), lead(Pb)-free/RoHS-compliant, operating temperature range −40°C to +85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | +4.75V to +5.25V DC supply; requires local 0.1µF ceramic bypass to GND for noise immunity and stable reference tracking. |
| AIN+ (Pin 2) | Positive analog input | True-differential input terminal; sampled relative to AIN− during hold phase; must stay within GND–0.3V to VDD+0.3V for ESD protection. |
| AIN− (Pin 3) | Negative analog input | Complementary differential input; defines common-mode baseline; same voltage range and protection as AIN+. |
| GND (Pin 4) | Analog/digital ground reference | Single ground connection point; layout best practice requires star-ground separation from digital return paths. |
| REF (Pin 5) | External reference voltage input | Sets full-scale range (e.g., +4.096V); bypassed with 0.1µF capacitor; input leakage ±1µA enables low-power reference buffering. |
| CNVST (Pin 6) | Conversion start and mode control | Rising edge powers up device and initiates track mode; falling edge triggers hold/conversion; pulse width selects unipolar/bipolar output format. |
| DOUT (Pin 7) | Serial data output | Three-state MSB-first output; transitions on SCLK falling edge; goes high-impedance after 12-bit readout completes. |
| SCLK (Pin 8) | Serial clock input | Master-generated clock (0–8MHz); controls timing of DOUT bit shifts; duty cycle 30–70% required for reliable sampling. |
Key Features
| Feature | Design Value |
|---|---|
| True-differential input architecture | Rejects common-mode noise up to 100kHz bandwidth while preserving signal integrity - essential for noisy industrial sensor front-ends. |
| Software-configurable unipolar/bipolar mode | Single CNVST pulse sequence selects output format (straight binary or two's complement), eliminating need for external polarity logic or post-processing. |
| AutoShutdown between conversions | Reduces quiescent current to 0.2µA automatically when idle - extends battery life in intermittent-sampling applications like wireless sensor nodes. |
| Internal conversion clock | Removes dependency on external clock source; frees MCU GPIO and simplifies timing-critical firmware by decoupling conversion timing from system clock. |
| SPI/QSPI/MICROWIRE compatibility | Interoperates with standard microcontroller serial peripherals without protocol translation - reduces driver development effort and validation overhead. |
Applications
| Portable Temperature Monitors | Flowmeters |
|---|---|
Use Scenario: Battery-powered handheld thermometers using thermocouple or RTD sensors with millivolt-level differential outputs. IC Role / Device Role / Timing Role: True-differential ADC digitizes sensor voltage across varying ambient temperatures while rejecting EMI from display backlight or RF modules. Use Value: ±1.0 LSB INL and 61dB SINAD ensure <0.1°C measurement resolution; 0.2µA shutdown current enables multi-year battery life in sleep-wake cycles. | Use Scenario: Ultrasonic or magnetic flowmeter transducers generating low-amplitude differential signals in industrial pipe environments. IC Role / Device Role / Timing Role: Front-end ADC captures fast transient flow pulses with 150ksps rate and 1MHz small-signal bandwidth for accurate time-of-flight calculation. Use Value: 1.4µs acquisition time and internal track/hold eliminate need for external op-amp buffering; differential input rejects ground-loop noise from motor drives. |
| Touch Screens | Low Power Data Acquisition |
Use Scenario: Resistive touch panels in medical handheld devices requiring precise X/Y coordinate detection with minimal power draw. IC Role / Device Role / Timing Role: Digitizes voltage divider outputs from touch panel electrodes using true-differential sampling to cancel supply ripple and LCD noise coupling. Use Value: Bipolar mode supports center-zero coordinate mapping; 200µA active current enables responsive touch detection without draining coin-cell batteries. | Use Scenario: Remote environmental monitoring nodes measuring temperature, humidity, and gas concentration with multi-sensor analog front-ends. IC Role / Device Role / Timing Role: Central ADC interfaces multiple sensors via multiplexed differential inputs, synchronized by CNVST pulses for correlated sampling. Use Value: 8-pin SOT23 footprint minimizes PCB area; unipolar/bipolar flexibility accommodates diverse sensor output ranges without redesigning signal conditioning. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar true-differential 10-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-pin SOIC, +2.7V to +5.25V supply, 200ksps, ±1.5 LSB INL, no AutoShutdown | Higher speed but larger package and higher 1.2mA active current - less suitable for ultra-low-power portable use | Select when higher throughput and SOIC handling are prioritized over battery life and board space. |
| MAX11100ETE+ | 12-bit resolution, 1MSPS, 10-pin TDFN, +2.7V to +3.6V only, integrated reference | Higher resolution and speed but incompatible +3.3V-only supply and no +5V operation - not drop-in for existing MAX1088EKA designs | Choose for upgraded precision in new designs where 3.3V rail is available and reference integration simplifies BOM. |
Compared with ADS7822U and MAX11100ETE+, the MAX1088EKA uniquely balances 10-bit accuracy, true-differential input, +5V compatibility, and sub-µA shutdown in an 8-pin SOT23 - making it optimal for cost- and size-constrained portable systems requiring robust noise rejection without sacrificing battery runtime.
Availability
MAX1088EKA is available at Aetrix Electronics and suitable for portable temperature monitors, flowmeters, touch screens, and low-power data acquisition systems requiring stable component supply across industrial and medical OEM programs.
Supply support for MAX1088EKA 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 MAX1086–MAX1089 family targets ultra-low-power, space-constrained data acquisition systems requiring true-differential input capability, simple 3-wire interfacing, and guaranteed performance across extended temperature ranges.
FAQ
What is the maximum sampling rate supported by the MAX1088EKA?
The MAX1088EKA supports a maximum sampling rate of 150ksps. This is achieved with a 3.7µs conversion time and 1.4µs acquisition time, enabled by its internal oscillator and true-differential track-and-hold circuit. At this rate, the device draws 200µA from a +5V supply and maintains 61dB SINAD at 10kHz input frequency - confirming real-time performance for dynamic sensor signals without aliasing in properly filtered systems.
Does the MAX1088EKA require an external reference voltage?
Yes, the MAX1088EKA requires an external reference voltage applied to the REF pin. It accepts +1.0V to VDD+50mV (up to +5.3V), with typical operation at +4.096V for full-scale 10-bit resolution. A 0.1µF ceramic capacitor must be placed directly between REF and GND to stabilize the reference and minimize noise coupling - omission degrades INL and increases gain error drift over temperature.
How does the MAX1088EKA implement true-differential input operation?
The MAX1088EKA implements true-differential input using a switched-capacitor track-and-hold that simultaneously samples AIN+ and AIN− on the rising edge of CNVST, then holds their difference for conversion. This architecture provides inherent common-mode rejection and supports both unipolar (0 to VREF) and bipolar (±VREF/2) input ranges - confirmed by the device's ±0.1mV input common-mode rejection specification and dual-mode output formatting controlled solely by CNVST timing.
What are the power consumption characteristics of the MAX1088EKA at different sampling rates?
The MAX1088EKA exhibits scalable power consumption: 200µA at 150ksps, 130µA at 100ksps, 13µA at 10ksps, and 1.5µA at 1ksps - all under +5V supply. In AutoShutdown mode (CNVST low between conversions), current drops to 0.2µA. These values are measured and specified in the datasheet's "Supply Current vs. Sampling Rate" graph (Figure MAX1086-9 toc05), enabling precise energy budgeting for battery-operated systems with variable sampling duty cycles.
Can the MAX1088EKA interface directly with standard microcontroller SPI peripherals?
Yes, the MAX1088EKA interfaces directly with standard microcontroller SPI peripherals configured for CPOL = 0 and CPHA = 0 (rising-edge sample, falling-edge setup). It outputs 12 bits (10 data + 2 sub-bits) MSB-first on DOUT, synchronized to SCLK falling edges. The device supports up to 8MHz SCLK and requires no level-shifting when interfaced with 3.3V or 5V MCUs - verified by compatibility statements for SPI, QSPI, and MICROWIRE protocols in the official datasheet.
MAX1088EKA 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:
- 10
- 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:
- -
MAX1088EKA FAQ
1.How can I place an order for MAX1088EKA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1088EKA 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 MAX1088EKA reliable?
The price and inventory of MAX1088EKA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1088EKA is usually 5 days.
3.What payment methods are accepted for MAX1088EKA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1088EKA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1088EKA?
MAX1088EKA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1088EKA 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 MAX1088EKA?
For technical support, including MAX1088EKA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1088EKA requirements.
6.How does Aetrix verify that MAX1088EKA is sourced from the original manufacturer or authorized distributors?
All MAX1088EKA 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 MAX1088EKA meets industry standards.
7.What is the process for return or replacement of MAX1088EKA?
All MAX1088EKA units undergo pre-shipment inspection (PSI). If there is an issue with MAX1088EKA, 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 MAX1088EKA part is unused and in its original packaging.
Return procedure for MAX1088EKA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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