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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:4,993
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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 parts with documented functional and application differences, and supply support for industrial embedded and low-power IoT designs.
Technical Context
The MAX1118EKA-T uses successive-approximation architecture with integrated track/hold circuitry, enabling accurate sampling up to 100ksps with <7.5µs conversion time. Its analog front-end supports two single-ended inputs (CH0, CH1) with 18pF input capacitance and ≤±10µA leakage, requiring source impedance <1.5kΩ for full accuracy.
It features a flexible reference architecture: unlike MAX1117/MAX1119, the MAX1118EKA-T accepts an externally applied reference from 1.0V to VDD at the REF pin (Pin 5), with typical input current of 10–20µA during conversion and high DC impedance (>1GΩ). The 3-wire serial interface operates up to 5MHz SCLK, supports idle-high or idle-low clock polarity, and outputs MSB-first straight binary on DOUT with automatic high-impedance release after 8 bits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit SAR - delivers 256 discrete output levels with binary coding; sufficient for sensor monitoring and system diagnostics where precision >±0.4% FSR is required. |
| Sampling Rate | 100ksps max - enables digitization of signals up to ~40kHz (Nyquist-limited) or higher via undersampling; supports real-time battery voltage and temperature tracking. |
| Supply Current | 135µA at 100ksps (typ), 18µA at 10ksps (typ), <1µA in AutoShutdown - enables multi-year operation on coin cells in solar-powered remote systems. |
| INL / DNL | ±1 LSB (max) - ensures monotonicity and linearity critical for closed-loop control feedback and receive signal strength indicator (RSSI) measurement. |
| Reference Input Range | 1.0V to VDD - allows direct use of system rail (e.g., 3.3V or 5V) or precision external references (e.g., 2.5V) without level-shifting circuitry. |
| Small-Signal Bandwidth | 4MHz - supports accurate capture of fast transients (e.g., motor startup spikes, surge events) before anti-alias filtering. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and outdoor environmental monitoring deployments without derating. |
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 PCB layouts in portable and wearable electronics.
| 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 for noise immunity. |
| CH0 (Pin 2) | Analog input channel 0 | Single-ended input referenced to GND; supports 0 to VREF range; protected by internal clamping diodes (GND−0.3V to VDD+0.3V). |
| CH1 (Pin 3) | Analog input channel 1 | Independent single-ended input; selected by second CNVST falling edge; shares same electrical specs as CH0. |
| GND (Pin 4) | Analog/digital ground | Common return for VDD, CH0/CH1, and REF; must be connected to star ground point to minimize noise coupling. |
| I.C.(REF) (Pin 5) | External reference input | Accepts 1.0V to VDD reference voltage; high-impedance node (10nA typ leakage); requires low-Z source (<100Ω) and local 10nF bypass if noisy. |
| CNVST (Pin 6) | Convert/start control | Falling-edge-triggered; initiates acquisition and conversion; double pulse selects CH1; must meet 100ns min high/low times. |
| DOUT (Pin 7) | Serial data output | Three-state, MSB-first output; driven low during conversion; presents result on falling SCLK edges; goes high-Z 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 SPI/QSPI/MICROWIRE CPOL/CPHA=0 or 1. |
Key Features
| Feature | Design Value |
|---|---|
| AutoShutdown™ mode | Reduces supply current to <1µA between conversions - eliminates need for external enable logic and extends battery life in intermittent-sampling applications. |
| Internal track/hold | 100kHz effective sampling rate with <7.5µs total acquisition + conversion time - enables precise capture of slowly varying signals (e.g., thermistor, battery voltage) without external sample-hold IC. |
| SPI/QSPI/MICROWIRE compatibility | Direct interface to microcontrollers without glue logic - simplifies firmware integration and reduces BOM count in resource-constrained embedded systems. |
| Flexible reference architecture | Supports external reference from 1.0V to VDD - allows optimization of dynamic range (e.g., 0–3.3V for 3.3V systems) without sacrificing resolution or adding DACs. |
| Low input leakage (±0.7µA typ) | Minimizes error in high-impedance sensor interfaces (e.g., pH electrodes, photodiode amplifiers) - avoids need for buffer op-amps in many cases. |
Applications
| Battery-Powered Test Equipment | Receive Signal Strength Indicators (RSSI) |
|---|---|
Use Scenario: Portable multimeter or handheld oscilloscope capturing voltage, current, and temperature readings from multiple sensors. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing analog sensor outputs with synchronized sampling; internal T/H eliminates inter-channel skew. Use Value: 135µA @ 100ksps enables >100 hours of continuous operation on two AA batteries; 8-bit resolution meets Class II metering accuracy requirements per IEC 61000-4-30. |
Use Scenario: Wireless module measuring RF power level across frequency bands to adjust transmitter gain or trigger link retraining. IC Role / Device Role / Timing Role: High-speed sampling of detector diode output to compute logarithmic RSSI value; 4MHz bandwidth captures envelope peaks accurately. Use Value: ±1 LSB INL ensures consistent dBm mapping across temperature; SPI interface allows rapid polling (≤10µs latency) for real-time AGC response. |
| Solar-Powered Remote Systems | 4mA to 20mA Powered Remote Data Acquisition |
Use Scenario: Environmental sensor node deployed in off-grid locations, logging temperature, humidity, and irradiance using solar charging. IC Role / Device Role / Timing Role: Low-quiescent ADC converting sensor outputs during brief wake-up windows; AutoShutdown cuts average current to sub-µA. Use Value: 18µA @ 10ksps and <1µA shutdown enable multi-year deployment on 100mAh Li-ion + solar; SOT23 package fits compact enclosure. |
Use Scenario: Loop-powered field transmitter converting 4–20mA process current into digital data for HART or Modbus RTU communication. IC Role / Device Role / Timing Role: Isolated ADC measuring shunt voltage drop; external 2.5V reference sets full-scale to match 16mA span (4–20mA = 0–16mA above offset). Use Value: 1V–VDD reference range allows direct use of isolated 3.3V rail; ±1 LSB DNL prevents non-monotonic behavior that could corrupt HART digital overlay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit dual-channel serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-bit, 200ksps, SPI-only interface, fixed 2.5V internal reference, no external REF pin | Requires external reference buffer if system rail ≠ 2.5V; higher speed but less flexible scaling | Select when fixed 2.5V full-scale and maximum throughput are prioritized over supply voltage flexibility. |
| MAX1113EKA-T | 8-bit, single-channel, identical supply range (2.7–5.5V), same SOT23 package, 135µA @ 100ksps, but no CH1 or REF pin | Lacks second channel and external reference capability - unsuitable for dual-sensor or variable-range designs | Choose only for cost-sensitive single-input applications where channel count and reference flexibility are not required. |
Compared with ADS7822U and MAX1113EKA-T, the MAX1118EKA-T uniquely combines dual-channel operation, externally adjustable reference (1V–VDD), and ultra-low 135µA active current - making it the only option among the three that supports scalable full-scale ranges *and* simultaneous multi-sensor acquisition in space- and power-constrained systems.
Availability
MAX1118EKA-T is available at Aetrix Electronics and suitable for battery-powered test equipment, solar-powered remote systems, and 4mA–20mA loop-powered data acquisition requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
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 applications.
The MAX1117/MAX1118/MAX1119 family was designed specifically for ultra-low-power, space-constrained embedded systems requiring dual-channel digitization without external support components - targeting handheld instrumentation, remote sensing, and energy-harvesting nodes.
FAQ
What is the reference voltage configuration for MAX1118EKA-T?
The MAX1118EKA-T does not have an internal reference; it requires an external reference applied to Pin 5 (I.C./REF) within 1.0V to VDD. This differs from MAX1117 (2.048V internal) and MAX1119 (4.096V internal). The external reference must deliver ≤100Ω output impedance and sustain up to 20µA load during conversion. Typical implementations use a precision voltage reference IC or filtered system rail.
How do I select between CH0 and CH1 on MAX1118EKA-T?
CH0 is sampled on the first falling edge of CNVST. To sample CH1, assert a second falling edge on CNVST after the first conversion completes - the device automatically switches channels. No register writes or command sequences are needed. Both channels share the same reference and timing characteristics, and conversions are sequential, not simultaneous.
What is the minimum CNVST pulse width requirement for MAX1118EKA-T?
The MAX1118EKA-T requires a minimum high time (tcsh) and low time (tcsi) of 100ns each on the CNVST pin. Violating this spec may cause missed or incomplete conversions. For reliable operation at low temperatures or high supply voltages, maintain ≥200ns pulse width margin. The CNVST pin can idle high or low between conversions.
Does MAX1118EKA-T support SPI Mode 3 (CPOL=1, CPHA=1)?
Yes - the MAX1118EKA-T supports both SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1), as well as MICROWIRE and QSPI formats. The interface is clock-polarity and phase agnostic; data is always output on the falling edge of SCLK regardless of idle state. Confirm µC SPI register settings match the chosen mode to avoid misreads.
What is the absolute maximum input voltage on CH0/CH1 pins of MAX1118EKA-T?
The absolute maximum rating for CH0 and CH1 is (GND − 0.3V) to (VDD + 0.3V), enforced by internal ESD diodes. However, for accurate conversion, inputs must stay within 0 to VREF (not VDD) and avoid exceeding (GND − 50mV) or (VDD + 50mV). Exceeding these limits causes nonlinear errors or missing codes - always ensure signal conditioning matches the selected reference voltage.
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:
- 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:
- 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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