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Analog Devices Inc./Maxim Integrated MAX1087ETA
- Part No.:
- MAX1087ETA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX1087ETA.pdf
- Description:
- MAX1087 150KSPS, 10-BIT, 2-CHANN
- Quantity:
- Payment:
- Shipping:
Inventory:513
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Product details
Overview
MAX1087ETA from Maxim Integrated is a 10-bit, 2-channel single-ended serial-output ADC in an 8-pin TDFN-EP package, operating from a +2.7V to +3.6V supply. It delivers 150ksps sampling rate, ±1.0 LSB INL, and 61dB SINAD at 10kHz input, with AutoShutdown current of 0.2µA. It serves as a low-power analog front-end for portable sensor interfaces requiring precise DC/low-frequency signal digitization.
For engineers reviewing the MAX1087ETA datasheet, MAX1087ETA pinout, MAX1087ETA application, or MAX1087ETA equivalent, this page provides verified technical context, validated pin functions, confirmed power-performance tradeoffs across sampling rates, and two rigorously cross-checked alternative parts for battery-powered data acquisition designs.
Technical Context
The MAX1087ETA implements a successive-approximation (SAR) architecture with an integrated track-and-hold (T/H), supporting true single-ended operation on AIN1 and AIN2 referenced to GND. Its internal 4MHz oscillator enables fixed 3.7µs conversion time without external clock dependency.
It uses a 3-wire SPI/QSPI/MICROWIRE-compatible interface with MSB-first 12-bit output (10 data + 2 sub-bits), DOUT active-low during conversion and high-impedance post-readout, and CNVST-driven channel selection via pulse-width encoding - all synchronized to SCLK up to 8MHz.
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. |
| Sampling Rate | 150ksps maximum - supports real-time capture of signals up to ~75kHz Nyquist bandwidth. |
| INL / DNL | ±1.0 LSB / ±1.0 LSB - ensures accurate code-to-voltage mapping across full temperature range (-40°C to +85°C). |
| Supply Current | 200µA at 150ksps, 13µA at 10ksps - enables dynamic power scaling via throughput control. |
| Shutdown Current | 0.2µA - reduces system standby power to nanoampere level between conversions. |
| SINAD / SFDR | 61dB / 70dB at 10kHz - supports high-fidelity measurement of low-noise sensor outputs. |
| Input Range | 0V to VREF (unipolar) - accepts 0–2.5V full-scale input when VREF = 2.5V, compatible with common precision references. |
Pinout & Package
MAX1087ETA is housed in an 8-pin TDFN-EP (3mm × 3mm) package with exposed pad (EP) for thermal enhancement. The EP must be connected to GND for optimal thermal performance and noise immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +3.6V; requires local 0.1µF bypass capacitor to GND for stable reference and comparator operation. |
| AIN1 (Pin 2) | Analog input channel 1 | Single-ended input referenced to GND; selected by default CNVST high pulse; max source impedance ≤300Ω for full AC performance. |
| AIN2 (Pin 3) | Analog input channel 2 | Second single-ended input; selected via CNVST low-high-low sequence; shares same input structure and timing as AIN1. |
| GND (Pin 4) | Analog/digital ground | Common return for VDD, REF, and analog inputs; must be star-connected to minimize noise coupling. |
| REF (Pin 5) | External reference input | Accepts 1.0V to VDD+50mV; sets full-scale range; requires 0.1µF ceramic bypass to GND for noise rejection. |
| CNVST (Pin 6) | Conversion start/control | Rising edge powers up device and initiates track mode; falling edge triggers hold and conversion; pulse width encodes channel selection. |
| DOUT (Pin 7) | Serial data output | 3-state output presenting MSB first; transitions on SCLK falling edge; goes high-Z after 12-bit read completes. |
| SCLK (Pin 8) | Serial clock input | Accepts up to 8MHz clock; controls data shift-out timing; duty cycle 30–70%; synchronous with µP master interface. |
Key Features
| Feature | Design Value |
|---|---|
| AutoShutdown™ between conversions | Reduces average current to 0.2µA idle state, enabling multi-year battery life in intermittent-sampling systems. |
| Internal conversion clock | Eliminates need for external timing components; guarantees consistent 3.7µs conversion time regardless of host processor clock stability. |
| True single-ended dual-channel input | Supports independent sampling of two grounded-referenced sensors (e.g., thermistor + RTD) without external multiplexer or level-shifting circuitry. |
| SPI/QSPI/MICROWIRE compatibility | Interoperates directly with industry-standard microcontroller serial peripherals (CPOL=0, CPHA=0), reducing firmware integration effort. |
| Low acquisition time | 1.4µs tACQ enables fast settling from high-impedance sources (<300Ω), minimizing dead time between samples. |
Applications
| Portable Temperature Monitors | Flowmeters |
|---|---|
Use Scenario: Battery-powered handheld thermometer logging ambient and probe temperatures every 5 seconds. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing thermistor voltage divider outputs with 10-bit resolution and auto-scaled sampling rate. Use Value: 13µA current draw at 10ksps extends CR2032 battery life beyond 3 years while maintaining ±0.5°C accuracy over -40°C to +85°C. | Use Scenario: Ultrasonic flowmeter measuring transit-time difference between upstream/downstream paths. IC Role / Device Role / Timing Role: Single-ended ADC capturing conditioned analog pulses from transducer amplifiers with precise timing alignment. Use Value: 3.7µs deterministic conversion time enables tight synchronization with ultrasonic burst timing, reducing jitter-induced velocity error. |
| Touch Screens | Low Power Data Acquisition |
Use Scenario: Resistive touch overlay on industrial HMI panel powered by Li-ion battery with 10-year field life requirement. IC Role / Device Role / Timing Role: ADC converting X/Y electrode voltage ratios during stylus press, triggered only on interrupt-driven wake-up. Use Value: 0.2µA shutdown current prevents parasitic drain during idle periods; fast 1.4µs acquisition captures transient touch events without lag. | Use Scenario: Wireless sensor node collecting vibration, humidity, and pressure data at 1ksps for predictive maintenance analytics. IC Role / Device Role / Timing Role: Central analog front-end digitizing multiple sensor outputs with programmable sample rate and automatic power gating. Use Value: Dynamic current scaling (2.5µA at 1ksps) allows energy-proportional sampling, optimizing RF transmission duty cycle and battery longevity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-pin SOIC package; 1.8V–5.25V supply; 200ksps; 0.9mW @ 200ksps; no AutoShutdown | Higher power consumption; lacks automatic low-power mode; requires external clock | Preferred when board space permits SOIC and higher speed is needed without dynamic power scaling. |
| MCP3202-I/P | 8-pin PDIP/SOIC; 2.7V–5.5V supply; 100ksps; 500µA @ 100ksps; SPI-only interface | Slower max rate; higher active current; no TDFN option; no CNVST-driven channel select | Selected for legacy through-hole designs or where pin compatibility with existing MCP32xx layouts is required. |
Compared with ADS7822U and MCP3202-I/P, MAX1087ETA offers superior power efficiency at low throughput (0.2µA shutdown vs. >1µA), smaller TDFN footprint, and integrated channel selection-making it optimal for space-constrained, battery-operated dual-sensor nodes.
Availability
MAX1087ETA is available at Aetrix Electronics and suitable for portable temperature monitors, flowmeters, and touch screens requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MAX1087ETA 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 industrial, medical, and portable applications.
The MAX1086–MAX1089 family targets ultra-low-power, space-constrained data acquisition systems where micropower operation, small footprint, and ease of digital interfacing are critical design requirements.
FAQ
What is the maximum sampling rate supported by the MAX1087ETA?
The MAX1087ETA supports a maximum sampling rate of 150ksps, corresponding to a fixed 3.7µs conversion time enabled by its internal 4MHz oscillator. At this rate, supply current is 200µA with VDD = +3.0V. Lower rates reduce current linearly - e.g., 13µA at 10ksps - allowing precise power/performance tradeoffs in battery-powered systems.
How does the MAX1087ETA handle dual analog inputs?
The MAX1087ETA implements 2-channel single-ended operation using CNVST pulse-width encoding: a simple high pulse selects AIN1, while a low-high-low sequence selects AIN2. Both channels share the same input structure, reference, and timing - eliminating need for external multiplexers. Input leakage is ±1µA, and acquisition time remains 1.4µs for either channel when source impedance is ≤300Ω.
Does the MAX1087ETA require an external reference voltage?
Yes, the MAX1087ETA requires an external reference voltage applied to the REF pin. It accepts 1.0V to VDD+50mV (e.g., 2.5V typical), and performance is optimized with a 0.1µF ceramic bypass capacitor to GND. The device does not include an internal reference; using a precision external reference (e.g., MAX6126) ensures full 10-bit linearity and minimizes gain error drift over temperature.
What digital interface protocols are supported by the MAX1087ETA?
The MAX1087ETA supports SPI, QSPI, and MICROWIRE protocols via its 3-wire serial interface (CNVST, SCLK, DOUT). It operates with CPOL = 0 and CPHA = 0, outputs MSB-first 12-bit frames (10 data + 2 sub-bits), and tolerates SCLK up to 8MHz. No mode pins or configuration registers are needed - interface behavior is hardwired for plug-and-play compatibility with standard microcontroller serial peripherals.
What package type and thermal considerations apply to the MAX1087ETA?
The MAX1087ETA uses an 8-pin TDFN-EP (3mm × 3mm) package with exposed pad. The EP must be soldered to a GND plane for effective heat dissipation and noise reduction. Thermal resistance θJA is 18.2°C/W, enabling continuous operation at +85°C ambient with minimal derating. PCB layout must separate analog and digital grounds at a single star point, and VDD must be bypassed locally with 0.1µF ceramic.
MAX1087ETA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 150
- Number of Inputs:
- 2
- 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:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-TDFN-EP (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1087ETA FAQ
1.How can I place an order for MAX1087ETA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1087ETA 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 MAX1087ETA reliable?
The price and inventory of MAX1087ETA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1087ETA is usually 5 days.
3.What payment methods are accepted for MAX1087ETA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1087ETA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1087ETA?
MAX1087ETA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1087ETA 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 MAX1087ETA?
For technical support, including MAX1087ETA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1087ETA requirements.
6.How does Aetrix verify that MAX1087ETA is sourced from the original manufacturer or authorized distributors?
All MAX1087ETA 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 MAX1087ETA meets industry standards.
7.What is the process for return or replacement of MAX1087ETA?
All MAX1087ETA units undergo pre-shipment inspection (PSI). If there is an issue with MAX1087ETA, 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 MAX1087ETA part is unused and in its original packaging.
Return procedure for MAX1087ETA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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