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Analog Devices Inc./Maxim Integrated MAX118CAI+T
- Part No.:
- MAX118CAI+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX118CAI+T.pdf
- Description:
- IC ADC 8BIT FLASH 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,646
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Product details
Overview
MAX118CAI+T from Maxim Integrated is an 8-bit, 8-channel analog-to-digital converter (ADC) optimized for high-speed microprocessor interfacing. It operates from a single +5V supply, achieves 1Msps sampling rate with 660ns conversion time, features internal track/hold and 1µA power-down mode, and is used in burst-mode data acquisition systems requiring fast wake-up and low quiescent current.
For engineers reviewing the MAX118CAI+T datasheet, MAX118CAI+T pinout, MAX118CAI+T application, or MAX118CAI+T equivalent, this page delivers verified technical context, real-world timing behavior, ratiometric reference operation details, and validated alternative options for industrial and portable measurement designs.
Technical Context
The MAX118CAI+T employs a half-flash architecture with two cascaded 4-bit flash ADC sections and an internal DAC to generate the full 8-bit result using only 15 comparators. Its analog multiplexer selects among eight input channels under A0–A2 address control, with IN8 hardwired to monitor REF+ voltage directly.
Digital interface supports two modes: read mode (MODE = 0), where RD initiates conversion and RDY signals completion; and write-read mode (MODE = 1), where WR starts conversion and INT indicates completion, enabling pipelined operation when WR and RD are tied together.
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 throughput in WR-RD mode with tWR + tRD + tRI + tACQ = 1.23MHz theoretical limit. |
| Conversion Time | 660ns - fixed latency per channel in WR-RD mode, enabling deterministic timing for burst-sampling applications. |
| Total Unadjusted Error | ≤ ±1LSB - guarantees monotonicity and no missing codes across full temperature range (0°C to +70°C). |
| Power-Down Current | 1µA typical - reduces system-level standby power in portable or remote sensing nodes without external circuitry. |
| Input Full-Power Bandwidth | 1MHz - supports accurate digitization of fast-rising analog signals up to 1MHz without attenuation. |
| SINAD | 45dB at 195.8kHz input - corresponds to ~7.2 effective bits, confirming usable dynamic range for medium-fidelity signal capture. |
Pinout & Package
MAX118CAI+T is packaged in a 28-pin SSOP (Shrink Small Outline Package) with 0.65mm lead pitch, surface-mount compatible, and rated for 0°C to +70°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 24) | Positive supply input | Accepts single +4.75V to +5.25V rail; requires 4.7µF + 0.1µF bypassing to GND for stable conversion performance. |
| PWRDN (Pin 23) | Power-down control input | Logic-low enables 1µA standby mode; wake-up time <200ns allows rapid reactivation in burst-sampling intervals. |
| A0–A2 (Pins 22, 21, 20) | Multiplexer address inputs | Select one of eight analog inputs (IN1–IN7 + IN8=REF+); address must be stable ≥160ns before conversion start. |
| IN1–IN7 (Pins 1–4, 25–27) | Analog input channels | High-impedance inputs with 32pF capacitance; support source impedances ≤800Ω without extended acquisition time. |
| IN8 / REF+ (Pin 14) | Internal reference monitor | Hardwired to REF+; reading IN8 returns digital code proportional to reference voltage-enables ratiometric calibration. |
| REF+ / REF− (Pins 14, 13) | Reference span terminals | Define full-scale (REF+) and zero-scale (REF−) voltages; internal 1kΩ resistance between them draws current even in power-down. |
| CS (Pin 16) | Chip-select enable | Must be low for WR/RDY and RD to be recognized; rising edge resets INT and RDY outputs. |
| WR/RDY (Pin 15) | Mode-dependent I/O | In MODE=1: WR input starts conversion; in MODE=0: open-collector RDY output signals data readiness. |
| RD (Pin 10) | Data access strobe | In MODE=0: initiates conversion and latches result; in MODE=1: enables three-state output drivers after INT assertion. |
| INT (Pin 11) | Conversion complete flag | Active-low open-drain output; falls at end of conversion, resets on rising edge of CS or RD. |
| D0–D7 (Pins 6–9, 17–20) | Parallel data outputs | Latched, three-state buffers directly interface to 8-bit µP data bus; VOL ≤0.4V at 2.6mA sink ensures TTL compatibility. |
| MODE (Pin 5) | Interface mode selector | Internally pulled low (50µA); logic-high enables write-read mode with pipelining capability via WR=RD connection. |
Key Features
| Feature | Design Value |
|---|---|
| Single +5V supply operation | Eliminates need for dual supplies or level shifters in embedded µP systems, reducing BOM count and layout complexity. |
| Internal track/hold circuit | Enables accurate sampling of fast analog transients up to 1MHz without external hold capacitor or driver amplifiers. |
| Ratiometric reference configuration | Allows direct use of system supply as REF+, making ADC output independent of VDD drift-ideal for battery-powered sensors. |
| No external clock required | Self-timed conversion eliminates clock distribution, jitter sensitivity, and synchronization overhead in compact designs. |
| 1µA power-down current | Reduces average system power by >99% during idle periods, extending battery life in remote data loggers and IoT endpoints. |
Applications
| Industrial Process Monitoring | Portable Medical Instrumentation |
|---|---|
|
Use Scenario: Continuous monitoring of multiple sensor outputs (temperature, pressure, flow) in PLC I/O modules with periodic burst sampling. IC Role / Device Role / Timing Role: 8-channel ADC acquires synchronized samples across analog inputs every 1ms, leveraging PWRDN to minimize average current between bursts. Use Value: 660ns conversion time and 1µA standby current enable 1000 samples/sec throughput while maintaining sub-100µA average supply draw. |
Use Scenario: Battery-powered handheld ECG or pulse oximeter acquiring multi-lead analog waveforms at clinical-grade fidelity. IC Role / Device Role / Timing Role: Digitizes up to eight biopotential channels with internal track/hold preserving waveform integrity during electrode switching. Use Value: Ratiometric operation referenced to VDD ensures stable LSB size despite battery voltage sag, improving long-term measurement repeatability. |
| Telecom Line Card Diagnostics | Automated Test Equipment (ATE) |
|
Use Scenario: Real-time voltage/current monitoring of power rails and signal integrity checks on high-density telecom line cards. IC Role / Device Role / Timing Role: Acts as front-end digitizer for supervisory circuits, using IN8 to self-monitor REF+ and detect reference drift or supply faults. Use Value: Built-in REF+ monitoring on IN8 provides autonomous reference health check without consuming an external channel or adding components. |
Use Scenario: High-throughput functional testing of mixed-signal ICs requiring parallel analog stimulus and response capture. IC Role / Device Role / Timing Role: Provides deterministic 660ns conversion latency and pipelined WR=RD operation to maximize test cycle efficiency. Use Value: Write-read pipelining enables back-to-back conversions with zero dead time, increasing test throughput by ~25% versus 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 |
|---|---|---|---|
| MAX118CPI+ | Same die, 28-pin wide plastic DIP package; higher thermal resistance (14.29mW/°C derating) and larger footprint than SSOP. | Preferred for through-hole prototyping or legacy board reuse; unsuitable for space-constrained PCBs. | Select MAX118CPI+ only if DIP mounting or manual assembly is required; MAX118CAI+T offers superior thermal performance and density. |
| ADS7822U | 8-bit, 4-channel SAR ADC; 200ksps max rate; SPI interface; no internal track/hold; 2.7–5.25V supply range. | Lower speed and channel count; suited for lower-power, lower-cost applications where serial interface suffices. | Choose ADS7822U for cost-sensitive, low-throughput designs with SPI host; MAX118CAI+T remains optimal for parallel µP interfaces demanding 1Msps and 8 channels. |
Compared with MAX118CPI+, MAX118CAI+T delivers better thermal dissipation and smaller PCB area; compared with ADS7822U, it provides double the channel count, 5× higher throughput, and parallel bus compatibility-making it uniquely suited for µP-based high-speed data acquisition.
Availability
MAX118CAI+T is available at Aetrix Electronics and suitable for industrial process monitoring, portable medical instrumentation, telecom diagnostics, and automated test equipment requiring stable component supply, guaranteed traceability, and long-term lifecycle support.
Supply support for MAX118CAI+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 fabless semiconductor company specializing in precision analog, mixed-signal, and high-reliability ICs for industrial, communications, and computing markets.
The MAX114/MAX118 family was designed specifically for microprocessor-centric data acquisition systems needing fast, low-power, multi-channel digitization with minimal external components and robust ratiometric operation.
FAQ
What is the operating temperature range for MAX118CAI+T?
The MAX118CAI+T is specified for commercial-grade operation from 0°C to +70°C. This range is confirmed in the Ordering Information table, where "CAI" denotes the 28-pin SSOP package with 0°C to +70°C rating. The device maintains full electrical performance-including ≤±1LSB total unadjusted error and 660ns conversion time-across this entire range.
Does MAX118CAI+T require an external clock to operate?
No, MAX118CAI+T does not require an external clock. Its half-flash architecture uses internal timing generation, allowing fully self-contained conversion cycles. The datasheet explicitly states "No External Clock Required" in the Features section, and timing parameters like tCRD (660ns) are internally determined-eliminating clock routing, jitter concerns, and external oscillator BOM cost.
How does the IN8 channel function in MAX118CAI+T?
In MAX118CAI+T, IN8 is internally hardwired to REF+, so selecting channel A2A1A0 = 111 reads the reference voltage itself. This enables ratiometric calibration and real-time reference health monitoring without consuming an external analog input. The Functional Diagram and Pin Description both confirm IN8's dedicated connection to REF+, and Table 1 lists it as "reads VREF+ if selected."
What is the purpose of the MODE pin on MAX118CAI+T?
The MODE pin on MAX118CAI+T selects between two digital interface protocols: MODE = 0 configures read mode (RD-driven conversion with RDY status), while MODE = 1 enables write-read mode (WR-initiated conversion with INT signaling). The pin is internally pulled low (50µA current source), so tying it high requires an external pull-up; leaving it unconnected defaults to read mode.
Can MAX118CAI+T operate with a 3V supply?
No, MAX118CAI+T is specified only for +5V operation (4.75V to 5.25V). The General Description states it "operates from a single +5V supply", and Absolute Maximum Ratings list VDD to GND as –0.3V to +7V-not indicating 3V compatibility. For +3V applications, Maxim explicitly directs users to the MAX113/MAX117 datasheet, confirming MAX118CAI+T is not rated for 3V use.
MAX118CAI+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:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX118CAI+T FAQ
1.How can I place an order for MAX118CAI+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX118CAI+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 MAX118CAI+T reliable?
The price and inventory of MAX118CAI+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX118CAI+T is usually 5 days.
3.What payment methods are accepted for MAX118CAI+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX118CAI+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX118CAI+T?
MAX118CAI+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX118CAI+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 MAX118CAI+T?
For technical support, including MAX118CAI+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX118CAI+T requirements.
6.How does Aetrix verify that MAX118CAI+T is sourced from the original manufacturer or authorized distributors?
All MAX118CAI+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 MAX118CAI+T meets industry standards.
7.What is the process for return or replacement of MAX118CAI+T?
All MAX118CAI+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX118CAI+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 MAX118CAI+T part is unused and in its original packaging.
Return procedure for MAX118CAI+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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