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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:1,348
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Product details
Overview
MAX1117EKA-T from Maxim Integrated is an 8-bit, dual-channel, single-supply analog-to-digital converter (ADC) with internal track/hold, +2.048V reference, SPI/QSPI/MICROWIRE-compatible serial interface, and 100ksps sampling rate. It operates from +2.7V to +3.6V, draws 175µA at full speed, and features automatic shutdown (<1µA). It targets low-power portable instrumentation and battery-powered sensor monitoring where compact size and microamp-level active current are critical.
For engineers reviewing the MAX1117EKA-T datasheet, MAX1117EKA-T pinout, MAX1117EKA-T application, or MAX1117EKA-T equivalent, this page delivers verified electrical parameters, SOT23-8 pin mapping, real-world use cases in handheld diagnostics and remote data acquisition, and two validated alternative ADCs for voltage-range–constrained designs.
Technical Context
The MAX1117EKA-T uses a successive-approximation register (SAR) architecture with integrated track-and-hold, enabling accurate sampling of two analog inputs (CH0/CH1) without external support circuitry. Its internal +2.048V reference sets a full-scale range of 0 to 2.048V, yielding 8mV per LSB (2.048V/256).
Conversion is internally clocked and completed in ≤7.5µs; data is serially output via DOUT on falling edges of SCLK up to 5MHz. The device enters AutoShutdown mode automatically after conversion completion, reducing supply current to <1µA without host intervention - a key enabler for intermittent-sampling systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit SAR - delivers discrete digital values across 256 steps for moderate-precision sensing. |
| Sampling Rate | 100ksps max - supports real-time capture of signals up to ~40kHz (Nyquist-limited), suitable for audio-band and control-loop sampling. |
| Internal Reference | +2.048V - enables precise 0–2.048V input range with 8mV/LSB step size; eliminates need for external reference in many applications. |
| Supply Current | 175µA at 100ksps (typ), 18µA at 10ksps (typ), <1µA in AutoShutdown - enables multi-year battery life in duty-cycled sensor nodes. |
| INL / DNL | ±1 LSB (typ) - ensures monotonicity and predictable transfer function across full code range for reliable threshold detection. |
| Small-Signal Bandwidth | 4MHz - allows accurate digitization of fast transients and supports undersampling of higher-frequency signals with proper anti-alias filtering. |
| Operating Voltage | +2.7V to +3.6V - matches common Li-ion/Li-poly and 3.3V system rails without level-shifting or LDO overhead. |
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 - ideal for space-constrained PCB layouts in portable devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VDD | Positive Supply Input | Accepts +2.7V to +3.6V; requires local 0.1µF bypass to GND for stable reference and comparator operation. |
| 2 CH0 | Analog Input Channel 0 | Primary differential-capable input; supports 0–2.048V range; input leakage ±0.7µA enables high-impedance sensor interfacing. |
| 3 CH1 | Analog Input Channel 1 | Secondary input; shares same T/H and reference; selected via second CNVST edge for sequential dual-channel sampling. |
| 4 GND | Analog/Digital Ground | Single-point star ground connection required; separates analog return path from noisy digital traces to minimize noise coupling. |
| 5 I.C.(REF) | Internally Connected Reference Node | Must be tied to GND; not user-accessible - distinguishes MAX1117 from MAX1118's external REF pin. |
| 6 CNVST | Convert/Start Control Input | Falling-edge-triggered; initiates acquisition and conversion; idle-low or idle-high compatible; double pulse selects CH1. |
| 7 DOUT | Three-State Serial Data Output | MSB-first, SPI-compatible; goes high-Z after 8th SCLK rising edge; sinks 2mA/4mA for direct µC interface without buffers. |
| 8 SCLK | Serial Clock Input | Accepts up to 5MHz clock; supports both CPOL/CPHA = 0 and 1 modes; ignored during conversion, active only post-acquisition. |
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 systems. |
| Dual-Channel Sequential Sampling | Enables synchronized measurement of two sensors (e.g., temperature + voltage) using one CNVST pin and shared timing resources. |
| SPI/QSPI/MICROWIRE Compatibility | Direct interface to common microcontroller peripherals without glue logic - reduces BOM count and layout complexity. |
| Internal +2.048V Reference | Provides stable, factory-trimmed reference with ±90ppm/°C drift - avoids cost and board area of external precision reference ICs. |
| Low Source Impedance Requirement | Supports accurate sampling with source impedances <1.5kΩ - simplifies front-end design versus higher-Z alternatives requiring op-amp buffering. |
Applications
| Handheld Diagnostic Tools | Battery-Powered Environmental Sensors |
|---|---|
|
Use Scenario: Portable multimeter or handheld calibration checker measuring voltage, current, and thermistor outputs. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing analog front-end outputs with internal reference and minimal external components. Use Value: 175µA active current and <1µA shutdown enable >1-year battery life; 8-bit resolution meets accuracy requirements for field-grade instruments. |
Use Scenario: Solar-powered soil moisture and ambient temperature node transmitting data over LoRaWAN every 15 minutes. IC Role / Device Role / Timing Role: Low-power sampling engine acquiring CH0 (moisture bridge) and CH1 (thermistor) before MCU wake-up and radio transmission. Use Value: AutoShutdown eliminates software power management overhead; 7.5µs conversion time minimizes active window and total energy per sample. |
| 4–20mA Loop-Powered Remote I/O | Low-Cost Industrial Control Panels |
|
Use Scenario: Two-wire 4–20mA transmitter module converting local sensor readings into standardized current loop output. IC Role / Device Role / Timing Role: Precision ADC providing feedback for DAC-based current regulation, referenced to internal 2.048V for ratio-metric stability. Use Value: Internal reference eliminates dependency on unstable loop supply; ±1 LSB INL ensures compliance with Class 0.1 industrial accuracy standards. |
Use Scenario: Front-panel voltage monitor in DIN-rail mounted PLC I/O module, reading supply rail and auxiliary sensor inputs. IC Role / Device Role / Timing Role: Dual-input ADC sharing single serial bus with host controller; CH0 monitors VDD, CH1 reads isolated analog input. Use Value: SOT23-8 package fits dense control panel layouts; SPI compatibility allows reuse of existing firmware drivers across multiple product variants. |
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); no internal reference. | Required when system uses existing precision reference (e.g., 2.5V or 4.096V) or operates from 5V rails; unsuitable if internal reference is mandatory. | Select MAX1118EKA-T when reference flexibility or 5V compatibility outweighs need for integrated 2.048V reference. |
| ADS7822U | TI part; 8-bit, 200ksps, +2.7V to +5.25V; internal 2.5V ref; SPI-only (no QSPI/MICROWIRE); 6-pin SOT23. | Lacks CH1 input - single-channel only; higher speed but no dual-sampling capability; different pinout prevents drop-in replacement. | Choose ADS7822U only for single-input, higher-speed needs where CH1 is unused and 2.5V reference suffices. |
Compared with MAX1117EKA-T, MAX1118EKA-T trades internal reference for supply and reference flexibility, while ADS7822U offers higher speed at the cost of channel count and interface compatibility - making MAX1117EKA-T optimal for compact, self-contained dual-channel 3.3V systems.
Availability
MAX1117EKA-T is available at Aetrix Electronics and suitable for handheld diagnostic tools, battery-powered environmental sensors, and 4–20mA loop-powered remote I/O requiring stable component supply and long-term production continuity.
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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX1117/MAX1118/MAX1119 family was engineered for ultra-low-power, space-constrained data acquisition - delivering dual-channel 8-bit conversion with integrated reference and serial interface in sub-3mm² SOT23 packages.
FAQ
What is the full-scale input range of the MAX1117EKA-T?
The MAX1117EKA-T has a fixed full-scale input range of 0V to +2.048V, set by its internal voltage reference. This yields a resolution of 8mV per LSB (2.048V ÷ 256). Input voltages beyond this range may cause clipping or damage if exceeding absolute maximum ratings (GND −0.3V to VDD +0.3V).
Does the MAX1117EKA-T support dual-channel simultaneous sampling?
No, the MAX1117EKA-T does not support true simultaneous sampling. It performs sequential sampling: CH0 is acquired first, and CH1 is sampled only after a second falling edge on CNVST. Both channels share the same internal track/hold and reference, so timing skew is minimized but not eliminated.
Can the MAX1117EKA-T operate from a 3.3V supply?
Yes, the MAX1117EKA-T is fully specified for operation from +2.7V to +3.6V, making it compatible with standard 3.3V logic and power rails. At VDD = +3.3V, typical supply current remains 175µA at 100ksps, and all timing and accuracy specifications are guaranteed.
What is the purpose of Pin 5 (I.C./REF) on the MAX1117EKA-T?
Pin 5 on the MAX1117EKA-T is labeled "I.C.(REF)" and is internally connected - it must be tied to GND and is not functional as a reference input. This distinguishes the MAX1117EKA-T from the MAX1118EKA-T, which uses Pin 5 as an external reference input (REF).
How does AutoShutdown work in the MAX1117EKA-T?
After completing a conversion and serial readout, the MAX1117EKA-T automatically enters AutoShutdown mode, reducing supply current to <1µA (typ) without host intervention. It remains in this state until the next CNVST falling edge triggers a new acquisition - eliminating software power-control overhead in intermittent-sampling applications.
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:
- Obsolete
- 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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