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Analog Devices Inc./Maxim Integrated MAX1117EKA+T
- Part No.:
- MAX1117EKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-8
- Datasheet:
-
MAX1117EKA+T.pdf
- Description:
- IC ADC 8BIT SAR SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,377
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Product details
Overview
MAX1117EKA+T from Maxim Integrated is a single-supply, low-power, 8-bit, dual-channel serial analog-to-digital converter (ADC) with internal track/hold, +2.048V reference, and SPI/QSPI/MICROWIRE-compatible 3-wire interface. It operates from +2.7V to +3.6V, consumes 175µA at 100ksps, and delivers ±1 LSB INL/DNL over –40°C to +85°C - ideal for battery-powered sensor monitoring in portable instrumentation.
For engineers reviewing the MAX1117EKA+T datasheet, MAX1117EKA+T pinout, MAX1117EKA+T application, or MAX1117EKA+T equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with functional distinctions, and supply support for volume procurement and BOM continuity.
Technical Context
The MAX1117EKA+T uses successive-approximation register (SAR) architecture with integrated track-and-hold, enabling full 8-bit conversion in <7.5µs without external clocking. Its internal +2.048V reference sets a 0–2.048V analog input range and yields 8mV/LSB resolution.
Dual-channel operation is controlled via CNVST edge sequencing: first falling edge initiates CH0 conversion; second falling edge (after completion) selects CH1. The 3-wire serial interface supports idle-high or idle-low SCLK, requires no level-shifting, and outputs MSB-first data on DOUT's falling edge at up to 5MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit SAR - delivers discrete digital output with 256 distinct codes for precise low-end signal digitization. |
| Sampling Rate | Up to 100ksps - supports real-time monitoring of slow-varying sensor signals (e.g., temperature, pressure) without oversampling burden. |
| INL / DNL | ±1 LSB - ensures monotonicity and ≤0.4% full-scale linearity error, critical for accurate calibration in portable test equipment. |
| Supply Current | 175µA at 100ksps (typ), <1µA in AutoShutdown™ - enables multi-year battery life in solar-powered remote acquisition systems. |
| Reference Voltage | +2.048V internal - provides stable, factory-trimmed reference eliminating need for external precision reference and reducing BOM count. |
| Input Range | 0 to VREF (0–2.048V) - matches common sensor output ranges (e.g., 0–2V ratiometric sensors) without scaling resistors. |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible 3-wire - connects directly to MCU GPIO or hardware SPI peripherals without glue logic or level translators. |
Pinout & Package
MAX1117EKA+T is housed in an 8-pin SOT23 package (1.6mm × 2.9mm footprint), occupying only 11% of an 8-pin plastic DIP - optimized for space-constrained handheld PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive supply input | Accepts +2.7V to +3.6V; powers analog and digital sections; requires local 0.1µF bypass to GND for noise immunity. |
| CH0 | Analog input channel 0 | High-impedance input (18pF, ±0.7µA leakage); accepts 0–2.048V; source impedance must be <1.5kΩ for full accuracy. |
| CH1 | Analog input channel 1 | Identical electrical specs to CH0; selected via second CNVST falling edge after CH0 conversion completes. |
| GND | Analog/digital ground reference | Single-point star ground required; separates analog return path from noisy digital supplies to minimize quantization noise. |
| I.C.(REF) | Internally connected reference node | Must be tied to GND externally; not a user-accessible reference pin - internal +2.048V reference is non-adjustable and unexposed. |
| CNVST | Convert/start control input | Falling-edge triggered; initiates acquisition on CH0 (first edge) or CH1 (second edge); supports idle-high or idle-low states. |
| DOUT | 3-state serial data output | Outputs 8-bit MSB-first data on SCLK falling edge; goes high-impedance 100–500ns after final clock pulse; compatible with 3.3V/5V logic. |
| SCLK | Serial clock input | Accepts up to 5MHz clock; ignored during conversion; controls data readout timing; supports CPOL/CPHA = 0 or 1 for SPI compatibility. |
Key Features
| Feature | Design Value |
|---|---|
| AutoShutdown™ mode | Reduces supply current to <1µA between conversions - eliminates need for software-controlled power gating in ultra-low-duty-cycle applications. |
| Internal +2.048V reference | Factory-trimmed, ±90ppm/°C drift - removes external reference IC, saves board area, and avoids reference-related gain error in portable designs. |
| Dual-channel multiplexing | Hardware-selectable CH0/CH1 via CNVST edge counting - enables two-sensor monitoring with single ADC, reducing component count vs. dual standalone converters. |
| Low input leakage (±0.7µA) | Minimizes voltage drop across high-impedance sensor sources (e.g., thermistors, pH electrodes) - preserves signal integrity without buffer amplifiers. |
| 4MHz small-signal bandwidth | Supports accurate sampling of fast transients (e.g., motor current spikes) using undersampling techniques - extends utility beyond DC/slow-signal use cases. |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous monitoring of body temperature and pulse oximetry signals in wearable health patches. IC Role / Device Role / Timing Role: Dual-channel ADC digitizes two analog biosensor outputs with synchronized sampling and low-latency serial readout. Use Value: 175µA active current and <1µA shutdown enable multi-week operation on coin-cell batteries; internal reference ensures consistent calibration across units. |
Use Scenario: Environmental parameter logging (temperature/humidity) in remote field deployments powered by AA batteries or solar cells. IC Role / Device Role / Timing Role: ADC interfaces with analog sensor outputs and feeds data to low-power MCU over SPI for scheduled wireless transmission. Use Value: 8-pin SOT23 footprint minimizes PCB area; AutoShutdown™ reduces average current to ~1.5µA at 1ksps - extending battery life to >2 years. |
| Solar-Powered Remote Telemetry | 4–20mA Loop-Powered Field Instruments |
Use Scenario: Soil moisture and solar irradiance measurement in off-grid agricultural IoT nodes. IC Role / Device Role / Timing Role: ADC converts sensor outputs for microcontroller processing and LoRaWAN transmission; operates intermittently to conserve energy. Use Value: Internal +2.048V reference eliminates need for external voltage reference, simplifying power tree design in energy-harvesting systems. |
Use Scenario: Analog sensor signal conditioning in loop-powered industrial transmitters where power budget is strictly limited to 3.5mA. IC Role / Device Role / Timing Role: Low-quiescent-current ADC digitizes process variable (e.g., pressure) for HART modulation or digital output. Use Value: 175µA max supply current at 100ksps allows headroom for MCU and communication circuitry within 3.5mA loop limit. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, serial 8-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1118EKA+T | Wider supply range (+2.7V to +5.5V); external reference input (1V to VDD); 135µA @ 100ksps | Used where system rail varies (e.g., mixed 3.3V/5V designs) or external reference is preferred for flexibility | Select when reference voltage must be adjustable or system VDD exceeds +3.6V - not pin-compatible due to REF pin function difference |
| ADS7822U | TI 8-bit SAR ADC; +2.7V to +5.25V supply; 1.25µs conversion time; no internal reference (requires external VREF) | Preferred in TI-centric designs requiring faster conversion or tighter timing control | Choose for higher speed (1.25µs vs. 7.5µs) or when external reference is already present; differs in pinout and timing protocol |
Compared with MAX1117EKA+T, MAX1118EKA+T offers broader supply tolerance and reference flexibility but lacks the fixed +2.048V reference, while ADS7822U trades internal reference and ultra-low power for faster conversion - making MAX1117EKA+T optimal for space- and battery-constrained 3.3V-only systems needing minimal BOM count.
Availability
MAX1117EKA+T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, and solar-powered remote telemetry requiring stable component supply across extended production lifecycles.
Supply support for MAX1117EKA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications.
The MAX1117/MAX1118/MAX1119 family was designed specifically for ultra-low-power, space-constrained, dual-channel data acquisition in battery- and energy-harvesting systems - emphasizing integration, minimal external components, and guaranteed performance over temperature.
FAQ
What is the operating voltage range for MAX1117EKA+T?
The MAX1117EKA+T operates from +2.7V to +3.6V - a narrow, optimized range that enables its ultra-low 175µA supply current at 100ksps. Operation outside this range is not specified and may cause malfunction or damage. This range aligns with common lithium coin-cell and single Li-ion battery systems, making MAX1117EKA+T especially suited for portable applications where power efficiency is critical.
Does MAX1117EKA+T require an external voltage reference?
No, MAX1117EKA+T does not require an external voltage reference. It integrates a factory-trimmed +2.048V internal reference that sets the full-scale analog input range (0 to +2.048V). The I.C.(REF) pin is internally connected and must be tied to GND - it is not a user-accessible reference output or input. This eliminates external reference components and associated layout complexity.
How are the two analog inputs (CH0 and CH1) selected on MAX1117EKA+T?
Channel selection on MAX1117EKA+T is controlled solely by the CNVST pin: the first falling edge initiates conversion on CH0; the second falling edge (after CH0 conversion completes and data is read) selects CH1. No additional control lines or register writes are needed - the sequencing is handled entirely in hardware, simplifying firmware and reducing MCU GPIO usage.
What is the typical power consumption of MAX1117EKA+T in shutdown mode?
In AutoShutdown™ mode, MAX1117EKA+T draws less than 1µA (typical 0.8µA) - a key enabler for multi-year battery life in intermittent-sampling applications. This ultra-low quiescent current occurs automatically after conversion completion and data readout, requiring no software command or external signal. At 1ksps, average current drops to ~1.5µA, consuming just ~1µW from a 3V supply.
Is MAX1117EKA+T pin-compatible with MAX1118EKA+T or MAX1119EKA+T?
No, MAX1117EKA+T is not pin-compatible with MAX1118EKA+T or MAX1119EKA+T. Although all three share the same 8-pin SOT23 package and pin numbering, Pin 5 (I.C.(REF)) serves different roles: on MAX1117EKA+T and MAX1119EKA+T, it is an internal connection requiring GND tie; on MAX1118EKA+T, it is an active REF input pin. Swapping parts without PCB revision risks incorrect biasing or failure.
MAX1117EKA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- 2
- Input Type:
- 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:
- Internal
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- SOT-23-8
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1117EKA+T FAQ
1.How can I place an order for MAX1117EKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1117EKA+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 MAX1117EKA+T reliable?
The price and inventory of MAX1117EKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1117EKA+T is usually 5 days.
3.What payment methods are accepted for MAX1117EKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1117EKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1117EKA+T?
MAX1117EKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1117EKA+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 MAX1117EKA+T?
For technical support, including MAX1117EKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1117EKA+T requirements.
6.How does Aetrix verify that MAX1117EKA+T is sourced from the original manufacturer or authorized distributors?
All MAX1117EKA+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 MAX1117EKA+T meets industry standards.
7.What is the process for return or replacement of MAX1117EKA+T?
All MAX1117EKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1117EKA+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 MAX1117EKA+T part is unused and in its original packaging.
Return procedure for MAX1117EKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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