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Analog Devices Inc./Maxim Integrated MAX1115EKA+T
- Part No.:
- MAX1115EKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-8
- Datasheet:
-
MAX1115EKA+T.pdf
- Description:
- IC ADC 8BIT SAR SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,525
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Product details
Overview
MAX1115EKA+T from Maxim Integrated is a single-supply, low-power, 8-bit successive-approximation ADC with integrated track/hold, +2.048V internal reference, SPI/QSPI/MICROWIRE-compatible 3-wire serial interface, and AutoShutdown™ mode. 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 MAX1115EKA+T datasheet, MAX1115EKA+T pinout, MAX1115EKA+T application, or MAX1115EKA+T equivalent, key selection criteria include its 8-pin SOT23 footprint, VDD/2 sampling capability, 7.5µs conversion time, 4MHz input bandwidth, and compatibility with microcontroller SPI peripherals without level-shifting or external clocking.
Technical Context
The MAX1115EKA+T employs a switched-capacitor SAR architecture with an internal auto-zero rail and binary-weighted DAC (16pF), enabling accurate digitization of signals referenced to VDD/2 or CH0. Its track/hold circuit acquires analog inputs with ≤1.5kΩ source impedance and supports undersampling up to 4MHz small-signal bandwidth.
Conversion is fully self-timed: a falling edge on CNVST initiates acquisition and internal conversion (<7.5µs), after which DOUT presents the MSB and clocks out 8-bit straight-binary data on SCLK falling edges. The device enters <1µA AutoShutdown automatically post-conversion, eliminating external power-control logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes for basic sensor digitization and control feedback. |
| Supply Voltage Range | +2.7V to +3.6V - compatible with single-cell Li-ion or 3.3V system rails without regulation overhead. |
| Internal Reference | +2.048V - enables precise 8mV/LSB scaling (VREF/256) and eliminates external reference component cost and layout area. |
| Sampling Rate | 100ksps - supports real-time monitoring of fast transients such as motor current spikes or audio envelope detection. |
| INL / DNL | ±1 LSB - ensures monotonicity and ≤0.4% full-scale linearity error after offset/gain calibration. |
| Supply Current | 175µA at 100ksps; <1µA in AutoShutdown - extends battery life in intermittent-sampling applications like wireless sensor nodes. |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible 3-wire - connects directly to common MCU peripherals without glue logic or protocol translation. |
Pinout & Package
MAX1115EKA+T is housed in an 8-pin SOT23 package (3.0mm × 1.6mm × 1.1mm), occupying only 30% of the footprint of an 8-pin SOIC - optimized for space-constrained portable 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. |
| CH0 | Analog input channel | Single-ended input with 0–VREF range; protected by internal clamps (GND −0.3V to VDD +0.3V). |
| I.C. | Internally connected | Must be tied to GND; not user-accessible - internal node for bias or reference routing. |
| GND | Analog/digital ground | Common return for VDD, CH0, and digital I/O; requires star-grounding near ADC for noise immunity. |
| CNVST | Convert/start control | Falling-edge-triggered; initiates acquisition and conversion; supports VDD/2 sampling via double toggle. |
| DOUT | Serial data output | Three-state, MSB-first; drives data on SCLK falling edge; goes high-Z after 8th bit for bus sharing. |
| SCLK | Serial clock input | Accepts up to 5MHz; idle-high or idle-low compatible; ignored during active conversion. |
Key Features
| Feature | Design Value |
|---|---|
| AutoShutdown™ mode | Reduces quiescent current to <1µA between conversions - eliminates need for external enable sequencing in duty-cycled systems. |
| Integrated +2.048V reference | Provides stable, factory-trimmed reference with 90ppm/°C tempco - removes external reference IC and associated calibration effort. |
| VDD/2 sampling capability | Enables ratiometric measurement against supply voltage - critical for robustness in unregulated battery-powered designs. |
| 4MHz input bandwidth | Supports accurate digitization of fast analog events (e.g., pulse width, transient overvoltage) beyond Nyquist limit via undersampling. |
| Low source impedance requirement | Optimized for ≤1.5kΩ driving impedance - simplifies front-end design with minimal op-amp buffering or RC filtering. |
Applications
| Battery-Powered Test Equipment | Receive-Signal-Strength Indicators (RSSI) |
|---|---|
Use Scenario: Handheld multimeter or portable oscilloscope probe measuring DC voltage, current, or temperature with microamp-level sleep current budget. IC Role / Device Role / Timing Role: Primary analog front-end digitizer; performs triggered single-shot or periodic sampling under µC control via SPI. Use Value: 175µA active current and <1µA shutdown current extend alkaline AA battery life to >1 year in typical 1-sample-per-second logging mode. |
Use Scenario: Cellular/WiFi module monitoring RF signal amplitude for link quality estimation and automatic gain control feedback. IC Role / Device Role / Timing Role: RSSI voltage-to-digital converter; samples detector diode output synchronized to RF burst timing. Use Value: 7.5µs conversion time and VDD/2 sampling enable accurate ratiometric measurement across varying supply conditions in compact RF modules. |
| Low-Power, Hand-Held Portable Devices | 4mA to 20mA Powered Remote Data-Acquisition Systems |
Use Scenario: Wearable health monitor acquiring ECG, skin temperature, or motion sensor outputs with strict size and energy constraints. IC Role / Device Role / Timing Role: Sensor signal digitizer interfacing directly to low-power MCU; uses AutoShutdown to minimize average current. Use Value: 8-pin SOT23 footprint saves >70% board area vs. SOIC; 15µA average current at 10ksps enables multi-day operation on coin-cell batteries. |
Use Scenario: Industrial field transmitter converting process sensor outputs (pressure, flow) into digital values for HART or Modbus communication. IC Role / Device Role / Timing Role: Isolated analog input conditioner and digitizer; powered from loop supply; communicates via isolated SPI. Use Value: Single +3.3V operation and internal reference eliminate need for separate analog supply rail - simplifying isolated DC-DC design in 4–20mA loop-powered enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 2.7V–5.25V supply; 1.25V internal ref; 200ksps; no VDD/2 sampling; 8-pin SOIC only | Lacks VDD/2 mode and SOT23 option - less suitable for ultra-low-power or space-constrained designs | Select if higher speed (200ksps) and SOIC compatibility outweigh size/power trade-offs. |
| MCP3001-I/P | 2.7V–5.5V supply; 2.56V internal ref; 200ksps; SPI-only (no QSPI/MICROWIRE); 8-pin PDIP/SOIC | No AutoShutdown; larger packages; higher 350µA active current - increases system power budget | Choose when legacy PDIP prototyping or strict SPI-only interface is required, and shutdown current is not critical. |
Compared with ADS7822U and MCP3001-I/P, MAX1115EKA+T uniquely combines SOT23 packaging, sub-1µA shutdown, VDD/2 sampling, and multi-protocol serial compatibility - making it optimal for miniaturized, battery-sensitive applications where supply headroom and layout area are constrained.
Availability
MAX1115EKA+T is available at Aetrix Electronics and suitable for battery-powered test equipment, portable medical monitors, industrial 4–20mA transmitters, and RSSI measurement circuits requiring stable component supply across extended production lifecycles.
Supply support for MAX1115EKA+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 U.S.-based semiconductor company specializing in precision analog, mixed-signal, and high-reliability ICs for industrial, medical, and communications markets.
MAX1115EKA+T belongs to Maxim's low-power serial ADC product line, engineered specifically for energy-efficient signal acquisition in space- and power-constrained portable and remote sensing systems.
FAQ
What is the maximum sampling rate supported by the MAX1115EKA+T?
The MAX1115EKA+T supports up to 100ksps (100,000 samples per second) using its internal clock. This rate is achievable with a 5MHz SCLK and proper CNVST timing; conversion time is guaranteed at ≤7.5µs across the full operating temperature range of –40°C to +85°C. The MAX1115EKA+T maintains specified INL/DNL and power consumption at this rate.
Does the MAX1115EKA+T require an external reference voltage?
No, the MAX1115EKA+T does not require an external reference voltage. It integrates a factory-trimmed +2.048V internal reference with 90ppm/°C temperature coefficient, enabling direct 8mV/LSB scaling. This eliminates external reference components and associated layout complexity while maintaining accuracy over temperature and supply variations.
How does the AutoShutdown™ feature work on the MAX1115EKA+T?
The MAX1115EKA+T automatically enters AutoShutdown™ mode - drawing <1µA - immediately after conversion completion and data readout. No external control signal is needed. The device remains in this ultra-low-power state until the next CNVST falling edge triggers a new acquisition cycle, making it ideal for intermittent-sampling applications like sensor wake-up systems.
Can the MAX1115EKA+T measure signals relative to VDD/2?
Yes, the MAX1115EKA+T supports VDD/2 sampling: toggling CNVST low twice (with ≥50ns high time between) configures the internal multiplexer to sample VDD/2 instead of CH0. This enables ratiometric measurements critical for supply-voltage-insensitive readings in battery-operated systems - a feature not present in many competing 8-bit ADCs.
What package type is used for the MAX1115EKA+T?
The MAX1115EKA+T is supplied in an 8-pin SOT23 package (3.0mm × 1.6mm × 1.1mm), with top mark "AADU". This compact footprint occupies only 30% of the area of an 8-pin SOIC, enabling high-density layouts in handheld and wearable electronics where board space is severely limited.
MAX1115EKA+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:
- 1
- 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 ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- SOT-23-8
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1115EKA+T FAQ
1.How can I place an order for MAX1115EKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1115EKA+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 MAX1115EKA+T reliable?
The price and inventory of MAX1115EKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1115EKA+T is usually 5 days.
3.What payment methods are accepted for MAX1115EKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1115EKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1115EKA+T?
MAX1115EKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1115EKA+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 MAX1115EKA+T?
For technical support, including MAX1115EKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1115EKA+T requirements.
6.How does Aetrix verify that MAX1115EKA+T is sourced from the original manufacturer or authorized distributors?
All MAX1115EKA+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 MAX1115EKA+T meets industry standards.
7.What is the process for return or replacement of MAX1115EKA+T?
All MAX1115EKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1115EKA+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 MAX1115EKA+T part is unused and in its original packaging.
Return procedure for MAX1115EKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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