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Analog Devices Inc./Maxim Integrated MAX118EAI+
- Part No.:
- MAX118EAI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX118EAI+.pdf
- Description:
- IC ADC 8BIT FLASH 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,199
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Product details
Overview
MAX118EAI+ from Maxim Integrated is an 8-bit, 8-channel analog-to-digital converter (ADC) with half-flash architecture, 1Msps sampling rate, 660ns conversion time, ±1LSB total unadjusted error, and 1µA power-down current. It operates from a single +5V supply and integrates a track/hold circuit for digitizing fast analog signals in high-speed data acquisition systems.
For engineers reviewing the MAX118EAI+ datasheet, MAX118EAI+ pinout, MAX118EAI+ application, or MAX118EAI+ equivalent, this page delivers verified technical context, real-world interface timing, ratiometric reference configuration details, and validated alternative options for industrial and portable measurement designs.
Technical Context
The MAX118EAI+ uses a two-stage half-flash architecture: a 4-bit flash ADC generates MSBs and a residue voltage, which a second 4-bit flash stage converts to LSBs-enabling 8-bit resolution with only 15 comparators. Its internal analog multiplexer selects among eight input channels under µP control via A0–A2 address lines.
In write-read mode (MODE = 1), conversion is initiated by a WR falling edge; INT asserts low upon completion, and RD enables data readout. The device supports pipelined operation (WR = RD) for overlapping conversion and read cycles, achieving up to 1.23MHz effective throughput when tRD < tINTL.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes with binary coding and 1LSB = (VREF+ − VREF−)/256. |
| Sampling Rate | 1Msps - maximum sustained conversion rate in WR-RD mode with tRD < tINTL timing. |
| Conversion Time | 660ns - fixed latency per channel in WR-RD mode, enabling deterministic timing in burst-mode systems. |
| Total Unadjusted Error | ±1LSB - guarantees monotonicity and no missing codes across full temperature range (−40°C to +85°C). |
| Power-Down Current | 1µA typical - reduces system-level standby power in portable or remote sensing applications. |
| Input Full-Power Bandwidth | 1MHz - supports accurate digitization of fast-rising analog signals without slew-induced distortion. |
| SINAD | 45dB at 195.8kHz input - defines usable dynamic range for medium-frequency signal capture. |
Pinout & Package
The MAX118EAI+ is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.635mm pitch and 10.2mm × 5.3mm body size. Pin 1 is marked with a dot; pin numbering follows standard counter-clockwise orientation from the index mark.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 24) | Positive supply input | +5V ±5% main power rail; requires 4.7µF + 0.1µF bypassing to GND for stable operation. |
| PWRDN (Pin 23) | Power-down control | Active-low enable: logic low reduces supply current to ~1µA; must be driven to VDD or GND (not floating) in power-down mode. |
| A0–A2 (Pins 22–21, 20) | Multiplexer address inputs | Select one of eight analog channels (IN1–IN7 + IN8 = REF+); valid before conversion start (tACQ ≥ 160ns required). |
| IN1–IN7 (Pins 1–4, 27–26, 25) | Analog input terminals | Single-ended inputs with 32pF capacitance; support source impedances ≤800Ω without extended acquisition time. |
| IN8 (internally connected) | Fixed reference monitor | Hard-wired to REF+; reads reference voltage when selected-used for ratiometric calibration or supply monitoring. |
| REF+ (Pin 14), REF− (Pin 13) | Reference span inputs | Define full-scale (REF+) and zero-scale (REF−) voltages; internal 1kΩ resistance between them draws current even in power-down. |
| CS (Pin 16), RD (Pin 10), WR/RDY (Pin 15) | Digital interface controls | Chip-select, read strobe, and dual-function write/ready pin; supports memory-mapped or I/O-port µP interfacing without glue logic. |
| D0–D7 (Pins 6–9, 17–20) | Three-state parallel data outputs | Latched 8-bit output bus compatible with 8-bit µP data buses; high-impedance when CS high or RD high in read mode. |
| INT (Pin 11) | Interrupt output | Open-collector active-low signal indicating conversion completion; resets on rising edge of CS or RD. |
| MODE (Pin 5) | Interface mode select | Low = read mode (RD initiates conversion); high = write-read mode (WR initiates, RD reads); internally pulled low at 50µA. |
Key Features
| Feature | Design Value |
|---|---|
| Half-flash conversion architecture | Enables 8-bit resolution with 15 comparators and 660ns latency-reducing die area and power vs. full-flash while maintaining speed. |
| Integrated track/hold circuit | Acquires analog input during tACQ (≥160ns), then holds voltage for conversion-eliminating external sample-hold requirements. |
| Ratiometric reference configuration | Allows direct connection of REF+ to VDD and REF− to GND, making output code independent of supply voltage variations. |
| Two µP interface modes | Read mode (MODE = 0) simplifies timing for wait-state-capable µPs; write-read mode (MODE = 1) enables pipelining and fastest throughput. |
| Internal 8th channel (IN8) | Always monitors REF+ voltage-provides real-time reference tracking for self-calibration or supply integrity checks. |
Applications
| High-Speed Data Acquisition | Portable Test Equipment |
|---|---|
Use Scenario: Remote sensor nodes capturing vibration, temperature, or pressure waveforms at 1Msps for edge analytics. IC Role / Device Role / Timing Role: 8-channel simultaneous-sampling ADC front-end with burst-mode power-down to extend battery life. Use Value: 1µA power-down current and 200ns wake-up enable >99% duty-cycle sleep in intermittent measurement intervals. |
Use Scenario: Handheld multimeters or oscilloscope probes requiring compact, low-power digitization of multi-point analog signals. IC Role / Device Role / Timing Role: Single-supply 8-bit ADC with integrated track/hold and ratiometric reference for supply-tolerant measurements. Use Value: Eliminates external reference ICs and sample-hold amplifiers-reducing BOM count and PCB footprint by ≥3 components. |
| Communications Baseband | DSP-Based Signal Processing |
Use Scenario: IF sampling in wireless transceivers where baseband I/Q signals must be digitized before digital filtering and demodulation. IC Role / Device Role / Timing Role: Medium-speed ADC with 1MHz full-power bandwidth and 45dB SINAD for clean RF signal capture. Use Value: Internal 8th channel monitors REF+ to detect reference drift-triggering recalibration before bit-error-rate degradation occurs. |
Use Scenario: Real-time audio or motor control DSP systems requiring synchronized multi-channel analog input for FFT or PID computation. IC Role / Device Role / Timing Role: µP-controlled 8-channel ADC with pipelined WR=RD operation to sustain 1.23MHz effective throughput. Use Value: Overlapping conversion and read cycles reduce µP wait states-improving CPU utilization by up to 35% vs. non-pipelined alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit, multi-channel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | SPI interface, 2.7–5.25V supply, 1MSPS, 8-bit, 4-channel; no internal track/hold or power-down below 10µA. | Requires external serial interface logic and sample-hold; better suited for space-constrained SPI-based microcontrollers. | Choose ADS7822U when board layout favors serial interface and µP lacks parallel bus, accepting higher idle current and added external components. |
| MAX1166EUA+ | 10-bit resolution, 200ksps, 8-channel, SPI interface, 2.7–3.6V supply, 1µA power-down; no internal track/hold. | Higher resolution but lower speed and narrower supply range; targets precision low-power sensor hubs rather than high-speed acquisition. | Choose MAX1166EUA+ when resolution >8-bit is mandatory and sampling rate ≤200ksps suffices-accepting SPI dependency and no track/hold integration. |
Compared with ADS7822U and MAX1166EUA+, the MAX118EAI+ uniquely combines parallel µP interface, integrated track/hold, 1Msps speed, and 1µA power-down in a single +5V 8-channel ADC-making it optimal for legacy 8-bit microcontroller systems requiring minimal external components and deterministic timing.
Availability
MAX118EAI+ is available at Aetrix Electronics and suitable for high-speed data acquisition, portable test equipment, communications baseband, and DSP-based signal processing requiring stable component supply across industrial temperature ranges.
Supply support for MAX118EAI+ 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 MAX118EAI+ belongs to Maxim's precision data acquisition product line, designed specifically for µP-centric systems needing fast, low-power, multi-channel digitization with minimal external support circuitry.
FAQ
What is the operating temperature range for the MAX118EAI+?
The MAX118EAI+ is rated for −40°C to +85°C ambient operation (industrial grade). This range is confirmed in the Ordering Information table and Electrical Characteristics section, where all DC and dynamic parameters-including ±1LSB total unadjusted error and 45dB SINAD-are guaranteed across this full span. The 'E' suffix in MAX118EAI+ explicitly denotes this industrial temperature grade.
Does the MAX118EAI+ require an external clock source?
No, the MAX118EAI+ does not require an external clock. Its half-flash architecture and internal timing control generate all necessary clocks autonomously. Conversion timing is governed solely by the µP's RD or WR strobes and associated setup/hold requirements (e.g., tACQ ≥ 160ns, tWR ≥ 100ns), as specified in the Timing Characteristics table. No crystal, oscillator, or clock buffer is needed.
How does the internal IN8 channel function in the MAX118EAI+?
The MAX118EAI+'s IN8 channel is permanently hard-wired to the REF+ pin and always returns the reference voltage value when selected via A2–A0 = 111. This provides a built-in diagnostic path to monitor reference stability, detect supply droop, or enable ratiometric calibration routines without consuming an external analog input channel.
Can the MAX118EAI+ operate with a 3V supply?
No, the MAX118EAI+ is specified only for +5V ±5% (4.75V to 5.25V) operation. Its absolute maximum ratings, electrical characteristics tables, and timing diagrams all assume VDD = +5V. For +3V applications, Maxim explicitly directs users to the MAX113/MAX117 family-distinct parts with different architectures and specifications.
What is the purpose of the MODE pin on the MAX118EAI+?
The MODE pin on the MAX118EAI+ selects between two µP interface protocols: MODE = 0 configures read mode (RD initiates conversion), while MODE = 1 enables write-read mode (WR initiates, RD reads). This dual-mode flexibility allows optimization for either wait-state-capable µPs (read mode) or maximum throughput via pipelining (write-read mode with WR = RD).
MAX118EAI+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 8
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- Flash
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- Selectable Address
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX118EAI+ FAQ
1.How can I place an order for MAX118EAI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX118EAI+ 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 MAX118EAI+ reliable?
The price and inventory of MAX118EAI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX118EAI+ is usually 5 days.
3.What payment methods are accepted for MAX118EAI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX118EAI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX118EAI+?
MAX118EAI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX118EAI+ 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 MAX118EAI+?
For technical support, including MAX118EAI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX118EAI+ requirements.
6.How does Aetrix verify that MAX118EAI+ is sourced from the original manufacturer or authorized distributors?
All MAX118EAI+ 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 MAX118EAI+ meets industry standards.
7.What is the process for return or replacement of MAX118EAI+?
All MAX118EAI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX118EAI+, 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 MAX118EAI+ part is unused and in its original packaging.
Return procedure for MAX118EAI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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