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Analog Devices Inc./Maxim Integrated MAX118EAI+T
- Part No.:
- MAX118EAI+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX118EAI+T.pdf
- Description:
- IC ADC 8BIT FLASH 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,225
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Product details
Overview
MAX118EAI+T from Maxim Integrated is an 8-bit, 8-channel analog-to-digital converter (ADC) with half-flash architecture, 1Msps sampling rate, 660ns conversion time, and 1µA power-down current. It operates from a single +5V supply, integrates an internal track/hold, and supports ratiometric operation via REF+/REF− inputs - used in high-speed remote data acquisition systems requiring low-power burst-mode sampling.
For engineers reviewing the MAX118EAI+T datasheet, MAX118EAI+T pinout, MAX118EAI+T application, or MAX118EAI+T equivalent, this page delivers verified electrical parameters, confirmed 28-pin SSOP package mapping, functional pin roles, real-world use cases in portable communications and DSP front-ends, and two validated alternative ADCs for 8-bit, 1Msps, +5V systems.
Technical Context
The MAX118EAI+T employs a half-flash conversion architecture using two cascaded 4-bit flash sections and an internal DAC to generate residue voltage - enabling full 8-bit resolution with only 15 comparators. Its internal analog multiplexer selects among eight input channels under A0–A2 address control, with IN8 hardwired to monitor REF+.
Digital interface supports two modes: read mode (MODE = GND) where RD initiates conversion and RDY signals readiness, and write-read mode (MODE = VDD) where WR starts conversion and INT flags completion. Power-down is activated by pulling PWRDN low, reducing VDD current to 1µA with sub-200ns wake-up latency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes with binary coding; 1 LSB = (VREF+ − VREF−)/256. |
| Sampling Rate | 1 Msps - supports continuous high-speed digitization of signals up to 195.8 kHz input frequency with ≥7.5 ENOB. |
| Conversion Time | 660 ns - fixed latency per channel in WR-RD mode; enables pipelined operation when WR tied to RD. |
| Total Unadjusted Error | ≤ ±1 LSB - guarantees monotonicity and no missing codes across full temperature range (−40°C to +85°C). |
| Power-Down Current | 1 µA typical - reduces system-level standby power in battery-operated or burst-sampling applications. |
| Input Full-Power Bandwidth | 1 MHz - allows accurate digitization of fast-rising analog transients without slew-induced error. |
| SINAD | 45 dB at 195.8 kHz - corresponds to ~7.2 effective bits; sufficient for voice-band and medium-fidelity sensor digitization. |
Pinout & Package
MAX118EAI+T is housed in a 28-pin Small Outline IC (SSOP) package with 0.635 mm pitch, JEDEC MS-012AC compliant, body size 10.2 mm × 5.3 mm × 1.95 mm. Pin 1 marked with dot; pin numbering counterclockwise from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 24) | Positive supply rail | Accepts +4.75V to +5.25V; requires 4.7µF + 0.1µF bypassing to GND for stable conversion. |
| PWRDN (Pin 23) | Power-down control input | Logic low disables internal circuitry, reducing IDD to 1µA; wake-up time <200ns. |
| A0–A2 (Pins 22, 21, 20) | Multiplexer channel address inputs | Select one of eight analog inputs (IN1–IN7 + IN8 = REF+); latched on WR or RD edge. |
| IN1–IN7 (Pins 1–4, 27–28, 26) | Analog input channels | High-impedance inputs (32 pF); support source impedances ≤800Ω without extended tACQ. |
| IN8 (internally connected) | Fixed reference monitor | Always reads REF+ voltage when selected; enables self-calibration or reference health check. |
| REF+ (Pin 14), REF− (Pin 13) | Differential reference span inputs | Define full-scale range; ratiometric operation possible if driven from same source as sensor supply. |
| GND (Pin 12) | Analog/digital ground reference | Single ground plane required; decoupling capacitors must connect here for noise immunity. |
| RD (Pin 10), WR/RDY (Pin 15) | Read control / ready-status I/O | In read mode: RD active-low initiates conversion, RDY open-collector indicates data ready. |
| INT (Pin 11) | Interrupt output | Active-low pulse signals end-of-conversion; resets on rising edge of CS or RD. |
| CS (Pin 16) | Chip-select enable | Must be low for WR/RD to be recognized; enables multi-device bus sharing. |
| D0–D7 (Pins 6–9, 17–20) | Three-state parallel data outputs | Latched, TTL-compatible outputs; directly interface to 8-bit µP data bus without glue logic. |
| MODE (Pin 5) | Interface mode select | Low = read mode (RD-driven); high = write-read mode (WR-initiated, INT-flagged). |
Key Features
| Feature | Design Value |
|---|---|
| Half-flash conversion architecture | Enables 8-bit resolution with 15 comparators and <660ns latency - reduces die area vs. full-flash while maintaining speed. |
| Integrated track/hold amplifier | Acquires fast analog signals during tACQ (≥160ns); eliminates need for external sample-and-hold in most 1Msps applications. |
| Ratiometric reference configuration | Allows REF+ and REF− to scale with sensor excitation voltage - cancels supply drift in bridge or RTD measurements. |
| 1µA power-down mode | Reduces average power in burst-sampling systems (e.g., wireless sensor nodes) without sacrificing wake-up responsiveness. |
| No external clock required | Internal timing generator eliminates clock distribution complexity and jitter sensitivity in compact PCB layouts. |
Applications
| Portable Data Loggers | Industrial Sensor Front-Ends |
|---|---|
Use Scenario: Battery-powered environmental monitors acquiring temperature, humidity, and pressure at 100–1000 Hz intervals. IC Role / Device Role / Timing Role: 8-channel ADC digitizes multiple sensor outputs sequentially; PWRDN enables microamp sleep between samples. Use Value: 1µA power-down and 660ns conversion minimize energy per sample, extending battery life beyond 1 year on coin cell. |
Use Scenario: PLC analog input modules conditioning 4–20 mA or thermocouple signals in factory automation cabinets. IC Role / Device Role / Timing Role: Digitizes up to eight isolated sensor channels with ratiometric REF+ tied to excitation supply for offset/gain stability. Use Value: ≤±1 LSB total unadjusted error ensures compliance with IEC 61000-4-5 surge immunity requirements for industrial accuracy class. |
| Communications Baseband Processing | DSP-Based Motor Control |
Use Scenario: Low-cost cellular infrastructure equipment digitizing IF signals in GSM/EDGE receivers before digital downconversion. IC Role / Device Role / Timing Role: ADC captures baseband I/Q waveforms at 1Msps; internal track/hold handles 1MHz full-power bandwidth transients. Use Value: 45 dB SINAD at 195.8 kHz supports >20 dB carrier-to-noise ratio in narrowband voice channel demodulation. |
Use Scenario: Real-time current/voltage sensing in servo drives monitoring three-phase motor currents and DC bus voltage. IC Role / Device Role / Timing Role: Simultaneous sampling of up to eight analog feedback paths (phase currents, bus voltage, temperature) synchronized to PWM cycles. Use Value: Pipelined WR=RD mode enables back-to-back conversions with zero dead time - critical for field-oriented control loop timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit, 1Msps ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 2.7–5.25V supply; SPI interface; no internal track/hold; 1.25µs conversion time. | Requires external S/H for >100kHz signals; better suited for low-voltage mixed-signal SoC integration. | Choose for 3.3V systems or when serial interface saves PCB routing; avoid for 1MHz burst sampling due to slower conversion. |
| MAX1166EUA+ | +5V supply; 8-channel, 10-bit resolution; 2.5µs conversion; 2µA power-down. | Higher resolution but lower speed; lacks ratiometric REF− flexibility and IN8 monitoring function. | Choose when 10-bit precision outweighs 1Msps requirement; not drop-in due to timing and resolution mismatch. |
Compared with ADS7822U and MAX1166EUA+, the MAX118EAI+T uniquely combines 1Msps speed, 1µA power-down, integrated track/hold, and REF+ monitoring in a parallel 8-bit interface - making it optimal for cost-sensitive, high-throughput embedded systems needing minimal external components.
Availability
MAX118EAI+T is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and communications baseband circuits requiring stable component supply across extended temperature ranges (−40°C to +85°C).
Supply support for MAX118EAI+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 industrial, automotive, and communications markets - emphasizing high performance, small footprint, and robust operation.
The MAX114/MAX118 family targets high-speed, low-power data acquisition in space- and energy-constrained systems - delivering 1Msps throughput with integrated signal conditioning and microprocessor-friendly parallel interfacing.
FAQ
What is the operating temperature range for MAX118EAI+T?
The MAX118EAI+T is rated for −40°C to +85°C ambient operation (industrial grade). This is confirmed in the Ordering Information table where "E" suffix denotes the −40°C to +85°C range, and "AI" package code specifies the 28-pin SSOP variant. All electrical specifications in the datasheet - including 1µA power-down current and ≤±1 LSB total unadjusted error - are guaranteed across this full range.
Does MAX118EAI+T require an external clock signal?
No, the MAX118EAI+T does not require an external clock. Its half-flash architecture uses an internal timing generator to control conversion sequencing. The datasheet explicitly states "No External Clock Required" in the Features section, and timing diagrams (Figures 3–6) show all operations triggered solely by RD, WR, CS, and MODE signals - with no clock input pin defined in the Pin Description or Pin Configurations.
How does the IN8 channel function in MAX118EAI+T?
In the MAX118EAI+T, IN8 is internally hardwired to REF+ and always returns the reference voltage value when selected via A2–A0 = 111. This is documented in the Functional Diagram footnote ("* MAX118 ONLY"), Table 1 (Truth Table), and Pin Description (IN8 row marked "-"). It enables real-time monitoring of reference stability or serves as a self-test channel without consuming an external analog input.
Can MAX118EAI+T operate with a 3.3V supply?
No, the MAX118EAI+T is specified only for +4.75V to +5.25V operation. The Absolute Maximum Ratings list VDD to GND as −0.3V to +7V, but the Electrical Characteristics table conditions explicitly state "VDD = +5V ±5%", and the Features section highlights "Single +5V Supply Operation". For +3V applications, Maxim directs users to the MAX113/MAX117 datasheet - confirming MAX118EAI+T is not 3.3V compatible.
What is the purpose of the MODE pin on MAX118EAI+T?
The MODE pin selects between two digital interface protocols: logic low configures read mode (RD-driven conversion, RDY status output), while logic high enables write-read mode (WR-initiated conversion, INT flag output). This dual-mode flexibility allows seamless integration with different microprocessor bus architectures - e.g., 8051-style (read mode) or Z80-style (write-read mode) - without external logic translation.
MAX118EAI+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX118EAI+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX118EAI+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 MAX118EAI+T reliable?
The price and inventory of MAX118EAI+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX118EAI+T is usually 5 days.
3.What payment methods are accepted for MAX118EAI+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX118EAI+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX118EAI+T?
MAX118EAI+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX118EAI+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 MAX118EAI+T?
For technical support, including MAX118EAI+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX118EAI+T requirements.
6.How does Aetrix verify that MAX118EAI+T is sourced from the original manufacturer or authorized distributors?
All MAX118EAI+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 MAX118EAI+T meets industry standards.
7.What is the process for return or replacement of MAX118EAI+T?
All MAX118EAI+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX118EAI+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 MAX118EAI+T part is unused and in its original packaging.
Return procedure for MAX118EAI+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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