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Analog Devices Inc./Maxim Integrated MAX1118EKA+T
- Part No.:
- MAX1118EKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-8
- Datasheet:
-
MAX1118EKA+T.pdf
- Description:
- IC ADC 8BIT SAR SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:8,834
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Product details
Overview
MAX1118EKA+T from Maxim Integrated is a single-supply, low-power, 8-bit, dual-channel SAR analog-to-digital converter with internal track/hold, programmable external reference input (1V to VDD), SPI/QSPI/MICROWIRE-compatible 3-wire serial interface, and automatic shutdown mode. It operates from +2.7V to +5.5V, consumes only 135µA at 100ksps, and delivers ±1 LSB INL/DNL over –40°C to +85°C - ideal for battery-powered remote data acquisition and handheld portable instrumentation.
For engineers reviewing the MAX1118EKA+T datasheet, MAX1118EKA+T pinout, MAX1118EKA+T application, or MAX1118EKA+T equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-chain support details specific to the MAX1118EKA+T variant - not the broader MAX1117/1119 family.
Technical Context
The MAX1118EKA+T uses successive-approximation architecture with integrated track-and-hold, supporting up to 100ksps conversion rate and 4MHz small-signal input bandwidth. Its analog inputs (CH0/CH1) accept 0 to VREF range, where VREF is externally supplied between +1V and VDD, enabling flexible full-scale scaling in systems with existing precision references.
Digital control is handled via CNVST (convert-start) and SCLK, with DOUT providing MSB-first serial output synchronized to SCLK falling edges. The device enters AutoShutdown™ mode (<1µA typical) automatically after conversion completion, eliminating need for external power management logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete digital codes; sufficient for basic sensor monitoring and control loop feedback. |
| Sampling Rate | 100ksps max - supports digitization of signals up to ~40kHz using Nyquist criteria; enables real-time battery voltage and temperature logging. |
| Supply Current | 135µA at 100ksps (typ), 18µA at 10ksps (typ), <1µA in AutoShutdown - enables multi-year operation on coin-cell batteries in intermittent-sampling applications. |
| INL / DNL | ±1 LSB - ensures monotonicity and predictable code transitions; critical for closed-loop control accuracy without calibration. |
| Reference Input Range | +1V to VDD - allows direct use of system rail or dedicated low-drift reference (e.g., REF3025), avoiding extra voltage dividers or buffers. |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible 3-wire - connects directly to MCU SPI peripherals without level shifters or glue logic; supports idle-high or idle-low clock polarity. |
| Conversion Time | 7.5µs - guarantees deterministic latency; simplifies timing-critical firmware polling or interrupt-driven readout. |
Pinout & Package
MAX1118EKA+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 portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Accepts +2.7V to +5.5V; powers analog and digital sections; requires local 0.1µF bypass to GND. |
| CH0 (Pin 2) | Analog input channel 0 | Single-ended input referenced to GND; full-scale range = 0 to VREF; max source impedance = 1.5kΩ for ≤1 LSB error. |
| CH1 (Pin 3) | Analog input channel 1 | Independent single-ended input; selected by second CNVST pulse; shares same VREF and timing constraints as CH0. |
| GND (Pin 4) | Analog/digital ground | Common return for VDD, CH0, CH1, and REF; must be connected to star ground point per layout guidelines. |
| I.C.(REF) (Pin 5) | Reference input (MAX1118 only) | Accepts external reference voltage from +1V to VDD; high-impedance node (10nA leakage); requires ≤100Ω source impedance during conversion. |
| CNVST (Pin 6) | Convert/start control | Falling-edge-triggered; initiates acquisition on CH0 (first pulse) or CH1 (second pulse); supports idle-high or idle-low states. |
| DOUT (Pin 7) | Serial data output | Three-state, MSB-first output; drives data on SCLK falling edge; goes high-impedance 100–500ns after 8th SCLK rising edge. |
| SCLK (Pin 8) | Serial clock input | Accepts up to 5MHz clock; ignored during conversion; controls data readout timing; compatible with CPOL/CPHA = 0 or 1. |
Key Features
| Feature | Design Value |
|---|---|
| External reference input (1V to VDD) | Enables system-level reference sharing - eliminates need for dedicated internal reference IC and reduces BOM count in multi-ADC designs. |
| AutoShutdown™ mode (<1µA) | Removes requirement for external enable/disable sequencing; cuts average current by >99% between conversions in low-duty-cycle sensing. |
| 8-pin SOT23 package | Reduces PCB area by >85% vs. SOIC-8; supports automated placement and reflow; compatible with standard 0.65mm pitch pick-and-place nozzles. |
| SPI/QSPI/MICROWIRE compatibility | Eliminates protocol translation logic - interfaces natively with STM32, MSP430, and PIC MCUs using stock SPI drivers without bit-banging. |
| 100ksps sampling with 7.5µs conversion time | Provides deterministic timing margin for firmware-controlled readout; avoids race conditions in interrupt service routines handling multiple ADCs. |
Applications
| Battery-Powered Remote Data Acquisition | Solar-Powered Environmental Monitoring |
|---|---|
|
Use Scenario: Wireless sensor node measuring soil moisture, ambient temperature, and panel voltage in off-grid agricultural installations. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing analog outputs from resistive sensors and shunt-based current monitors; triggered by ultra-low-power MCU on scheduled intervals. Use Value: 135µA active current and <1µA shutdown draw extend 2000mAh Li-SOCl₂ battery life to >10 years at 1-sample-per-minute duty cycle. |
Use Scenario: Standalone weather station powered by 6V solar panel + supercapacitor, logging wind speed, humidity, and irradiance. IC Role / Device Role / Timing Role: Simultaneous sampling of thermistor (CH0) and photodiode amplifier (CH1) with shared external reference derived from regulated 3.3V rail. Use Value: External reference support avoids adding a separate voltage reference IC, reducing bill-of-materials cost and board area by 30%. |
| Handheld Portable Test Equipment | 4mA–20mA Loop-Powered Transmitters |
|
Use Scenario: Pocket-sized multimeter with auto-ranging voltage/current measurement and Bluetooth telemetry. IC Role / Device Role / Timing Role: High-speed dual-input ADC capturing transient events (e.g., switch bounce, motor startup spikes) while maintaining low quiescent power during standby. Use Value: 4MHz input bandwidth enables accurate capture of fast transients without external anti-aliasing filters, simplifying front-end design. |
Use Scenario: Industrial pressure transmitter converting 4–20mA loop signal to digital output for HART communication. IC Role / Device Role / Timing Role: Precision ADC interfacing with op-amp-based I-to-V converter; reference tied to loop supply rail to reject common-mode noise. Use Value: ±1 LSB INL/DNL ensures 0.4% full-scale accuracy over temperature - meets Class A requirements for process control transmitters. |
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 |
|---|---|---|---|
| ADS7822U | 8-bit, 200ksps, +2.7V to +5.25V, internal 2.5V ref, SPI-only interface, no external ref input | Fixed internal reference limits full-scale flexibility; higher speed but higher 1.2mA active current | Select when maximum throughput is prioritized over power and reference flexibility. |
| MCP3002-I/P | 10-bit, 200ksps, +2.7V to +5.5V, internal 2.5V ref, SPI interface, no external ref input, DIP-8 package | Higher resolution but larger footprint and no external reference option; 500µA active current at 200ksps | Select when 10-bit resolution is required and through-hole assembly is acceptable. |
Compared with MAX1118EKA+T, ADS7822U offers higher speed but sacrifices reference flexibility and power efficiency, while MCP3002-I/P adds resolution and voltage range compatibility at the cost of significantly higher supply current and legacy packaging - making MAX1118EKA+T optimal for ultra-low-power, space-constrained, reference-flexible designs.
Availability
MAX1118EKA+T is available at Aetrix Electronics and suitable for battery-powered test equipment, solar-powered remote systems, and handheld portable instrumentation requiring stable component supply across extended production lifecycles.
Supply support for MAX1118EKA+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 markets.
The MAX1117/MAX1118/MAX1119 family was designed specifically for ultra-low-power, dual-channel data acquisition in size- and energy-constrained portable and remote systems - with the MAX1118EKA+T variant optimized for wide-supply-voltage operation and external reference integration.
FAQ
What is the reference voltage configuration for MAX1118EKA+T?
The MAX1118EKA+T does not include an internal reference; it requires an external reference applied to the REF pin (Pin 5), ranging from +1V to VDD. This allows system-level reference sharing and eliminates the need for a dedicated reference IC. The analog input full-scale range is 0 to VREF, and the reference must deliver ≤20µA average current with ≤100Ω output impedance during conversion. MAX1118EKA+T's flexibility here distinguishes it from MAX1117 (2.048V internal) and MAX1119 (4.096V internal).
How does the MAX1118EKA+T select between CH0 and CH1 for conversion?
The MAX1118EKA+T uses the CNVST pin to select channels: a single falling edge on CNVST initiates conversion on CH0; a second falling edge (after CH0 conversion completes) selects CH1. This dual-pulse method avoids requiring additional control lines or register writes. During active conversion, DOUT remains low; after completion, the MSB appears immediately, and data is clocked out on subsequent SCLK falling edges. MAX1118EKA+T's channel selection is hardware-driven and deterministic.
What is the power consumption behavior of MAX1118EKA+T at different sampling rates?
MAX1118EKA+T features AutoShutdown™, drawing 135µA at 100ksps, 18µA at 10ksps, and <1µA when idle. At 1ksps, average current drops to ~1.5µA; at 0.1ksps (100Hz), it falls to ~0.3µA (~1µW). This nonlinear scaling results from the device powering analog circuitry only during the 7.5µs conversion window - making MAX1118EKA+T exceptionally efficient for burst-mode or event-triggered sampling in energy-harvesting systems.
Is MAX1118EKA+T compatible with standard SPI microcontrollers?
Yes, MAX1118EKA+T is fully compatible with standard SPI peripherals: it supports both CPOL=CPHA=0 and CPOL=CPHA=1 modes, requires no external logic, and operates with SCLK up to 5MHz. DOUT is three-state and driven on SCLK falling edges in MSB-first format. The interface works natively with STM32, PIC, and MSP430 SPI modules - confirmed by Maxim's application schematics and timing diagrams in the official datasheet for MAX1118EKA+T.
What package and pin compatibility does MAX1118EKA+T have?
MAX1118EKA+T uses an 8-pin SOT23 package (1.6mm × 2.9mm) with standardized pinout: VDD (1), CH0 (2), CH1 (3), GND (4), REF (5), CNVST (6), DOUT (7), SCLK (8). It shares identical footprint and pin mapping with MAX1117EKA and MAX1119EKA - enabling drop-in replacement within the same family when supply voltage and reference architecture align. However, MAX1118EKA+T is not pin-compatible with non-MAX111x series ADCs due to its unique REF pin function.
MAX1118EKA+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:
- External
- 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:
- -
MAX1118EKA+T FAQ
1.How can I place an order for MAX1118EKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1118EKA+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 MAX1118EKA+T reliable?
The price and inventory of MAX1118EKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1118EKA+T is usually 5 days.
3.What payment methods are accepted for MAX1118EKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1118EKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1118EKA+T?
MAX1118EKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1118EKA+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 MAX1118EKA+T?
For technical support, including MAX1118EKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1118EKA+T requirements.
6.How does Aetrix verify that MAX1118EKA+T is sourced from the original manufacturer or authorized distributors?
All MAX1118EKA+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 MAX1118EKA+T meets industry standards.
7.What is the process for return or replacement of MAX1118EKA+T?
All MAX1118EKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1118EKA+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 MAX1118EKA+T part is unused and in its original packaging.
Return procedure for MAX1118EKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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