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Analog Devices Inc./Maxim Integrated MAX114ENG+
- Part No.:
- MAX114ENG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- -
- Datasheet:
-
MAX114ENG+.pdf
- Description:
- IC ADC 8BIT 1MSPS 24-DIP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
The MAX114ENG+ from Maxim Integrated is a microprocessor-compatible, 8-bit, 4-channel analog-to-digital converter (ADC) using half-flash architecture to achieve 660ns conversion time (1Msps) with single +5V supply operation. It integrates an internal track/hold circuit, supports ratiometric operation via configurable reference inputs (REF+, REF−), and features a power-down pin reducing supply current to 1µA. It is used in high-speed data acquisition systems requiring burst-mode sampling and low-power standby.
For engineers reviewing the MAX114ENG+ datasheet, MAX114ENG+ pinout, MAX114ENG+ application, or MAX114ENG+ equivalent, this page delivers verified technical context, exact pin functions, real-world use scenarios, and validated alternative parts - all grounded in Maxim's official specifications for the MAX114ENG+ variant in 24-pin narrow plastic DIP package.
Technical Context
The MAX114ENG+ employs a two-stage half-flash architecture: a 4-bit flash ADC generates the MSBs, then an internal DAC produces a residue voltage that feeds a second 4-bit flash stage for LSBs - achieving full 8-bit resolution with only 15 comparators. Its analog multiplexer selects among four single-ended input channels (IN1–IN4) under A0–A2 address control.
Digital interface operates in either read mode (MODE = 0) or write-read mode (MODE = 1), supporting direct connection to 8-bit parallel microprocessor buses via latched three-state outputs (D0–D7). Conversion initiation and data access timing are tightly specified - e.g., tCRD = 660ns (WR-RD mode), tUP = 320ns, and tACQ = 160ns - enabling deterministic integration into timing-critical embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete output codes with binary coding; 1LSB = (VREF+ − VREF−)/256. |
| Conversion Time | 660ns per channel - enables true 1Msps sampling rate in WR-RD mode with tRD < tINTL. |
| Total Unadjusted Error | ≤ ±1LSB - guarantees monotonicity and no missing codes across full temperature range. |
| Power-Down Current | 1µA typical at +5V - allows ultra-low quiescent power in burst-mode applications between samples. |
| Input Full-Power Bandwidth | 1MHz - supports accurate digitization of fast-rising signals up to 1MHz without attenuation. |
| Supply Voltage | +4.75V to +5.25V - tight tolerance ensures stable operation with standard 5V logic rails and bypassing. |
| SINAD | 45dB at fIN = 195.8kHz - corresponds to ~7.2 effective bits, confirming usable dynamic performance for medium-speed signal capture. |
Pinout & Package
The MAX114ENG+ is housed in a 24-pin narrow plastic DIP (dual in-line package) with 0.3-inch body width and through-hole mounting. Pin pitch is 0.1 inch; lead finish is tin-lead. This package is RoHS-compliant per Maxim's packaging documentation for ENG+ suffix parts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 24) | Positive supply input | Accepts +4.75V to +5.25V; requires 4.7µF electrolytic + 0.1µF ceramic bypass to GND. |
| PWRDN (Pin 23) | Power-down control input | Logic low enables 1µA shutdown; rising edge initiates 320ns power-up + track/hold acquisition sequence. |
| A0–A2 (Pins 22, 21, -) | Multiplexer channel address inputs | 3-bit binary select for IN1–IN4; A2 is NC on MAX114 (unconnected, not tied). |
| IN1–IN4 (Pins 5, 3, 2, 4) | Analog input channels | Single-ended, 0V to VDD range; 32pF input capacitance limits max source impedance to ~800Ω for tACQ compliance. |
| REF+ (Pin 14), REF− (Pin 13) | Reference voltage terminals | Define full-scale (REF+) and zero-scale (REF−) points; internal 1kΩ resistance draws current even in power-down. |
| CS (Pin 16), RD (Pin 10), WR/RDY (Pin 15) | Digital interface controls | CS enables device; RD reads data in read mode; WR initiates conversion in write-read mode; WR/RDY serves dual function. |
| D0–D7 (Pins 6, 7, 8, 9, 17, 18, 19, 20) | Three-state parallel data outputs | Latched, bus-compatible outputs; VOL ≤ 0.4V at 2.6mA sink, VOH ≥ 4V at 360µA source. |
| INT (Pin 11) | Interrupt output | Open-collector, active-low end-of-conversion flag; resets on rising edge of CS or RD. |
| GND (Pin 12) | Ground reference | System ground return for analog and digital sections; must be low-impedance and star-connected near bypass caps. |
| MODE (Pin 5) | Interface mode selection | Internally pulled low (50µA); MODE = 0 → read mode; MODE = 1 → write-read mode with pipelining support. |
Key Features
| Feature | Design Value |
|---|---|
| No external clock required | Internal timing generator eliminates need for external oscillator or clock distribution, simplifying PCB layout and reducing BOM count. |
| Internal track/hold circuit | Enables accurate sampling of fast analog transients up to 1MHz bandwidth without external components or timing coordination. |
| Ratiometric operation support | Reference inputs (REF+, REF−) allow direct connection to sensor bridges or voltage dividers, rejecting supply rail variations in measurement. |
| 1µA power-down current | Reduces average system power by >99% during idle intervals, critical for battery-powered remote DAQ and portable instrumentation. |
| Microprocessor bus compatibility | Latched three-state outputs and memory/I/O-mapped interface eliminate glue logic - connects directly to 8-bit µP data buses (e.g., 8051, Z80). |
Applications
| High-Speed DSP Front-End | Remote Data Acquisition Node |
|---|---|
|
Use Scenario: Digitizing sensor outputs (e.g., vibration, acoustic, or current-sense signals) in real-time DSP systems operating at 1Msps. IC Role / Device Role / Timing Role: Primary analog front-end ADC providing synchronized 8-bit samples to DSP processor via parallel bus; INT signal triggers DMA or interrupt-driven processing. Use Value: 660ns conversion time and 1MHz full-power bandwidth ensure minimal aliasing and faithful capture of transient events within DSP latency budgets. |
Use Scenario: Battery-powered environmental monitoring node collecting temperature, humidity, and pressure readings at scheduled intervals. IC Role / Device Role / Timing Role: Low-power ADC core entering 1µA shutdown between measurements; PWRDN controlled by microcontroller GPIO to minimize system quiescent current. Use Value: Power-down capability reduces average current consumption to sub-µA levels over long sleep intervals, extending battery life beyond 5 years. |
| Portable Test Equipment | Communications System Monitoring |
|
Use Scenario: Handheld multimeter or signal analyzer capturing analog waveforms with minimal size and thermal footprint. IC Role / Device Role / Timing Role: Compact 4-channel ADC handling multiple sensor inputs (e.g., voltage, current, thermistor) with shared reference and single-supply simplicity. Use Value: Single +5V operation and integrated track/hold eliminate need for dual supplies or external sample-hold ICs - reducing board area and component count. |
Use Scenario: Base station subsystem monitoring RF power amplifier bias voltages, temperature, and supply rails for fault detection. IC Role / Device Role / Timing Role: Supervisory ADC scanning multiple DC parameters in burst mode; ratiometric configuration rejects supply ripple affecting accuracy. Use Value: ≤±1LSB total unadjusted error and 45dB SINAD ensure reliable threshold detection and trend analysis over industrial temperature range (−40°C to +85°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit, multi-channel, parallel-output ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX115ENG+ | Pin-compatible 4-channel upgrade with 10-bit resolution, 2.5µs conversion time, and identical 24-pin DIP package; higher accuracy but slower speed. | Used where resolution >8-bit is required and 1Msps is not mandatory - e.g., precision sensor calibration vs. real-time waveform capture. | Select MAX115ENG+ when SNR >50dB and ENOB >9 bits are needed; retain same PCB layout but update firmware for 10-bit data handling. |
| ADS7822U | 8-bit, 200ksps SAR ADC in 8-pin SOIC; serial SPI interface, no internal track/hold, 2.7–5.25V supply; lower power (1.5mW active) but no parallel bus support. | Targeted at space-constrained, low-pin-count designs where µC has SPI and timing flexibility outweighs parallel bus convenience. | Choose ADS7822U for compact, low-cost, low-power nodes with available SPI resources; expect layout redesign and driver software changes. |
Compared with MAX114ENG+, MAX115ENG+ offers higher resolution at the cost of speed, while ADS7822U trades parallel interface and track/hold for size and supply flexibility - making each suitable for distinct system-level trade-offs in resolution, throughput, and integration effort.
Availability
The MAX114ENG+ is available at Aetrix Electronics and suitable for high-speed data acquisition, portable instrumentation, and communications monitoring applications requiring stable component supply, long-term lifecycle support, and guaranteed authentic Maxim sourcing.
Supply support for MAX114ENG+ 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 MAX114ENG+ belongs to Maxim's legacy high-speed ADC product line designed specifically for microprocessor-based systems needing fast, low-power, parallel-interface digitization of multiple analog channels in compact packages.
FAQ
What is the operating temperature range of the MAX114ENG+?
The MAX114ENG+ is rated for operation from −40°C to +85°C. This extended industrial temperature range is confirmed in Maxim's official Ordering Information table, where "ENG" suffix denotes the −40°C to +85°C grade in 24-pin narrow plastic DIP package. All electrical characteristics - including 660ns conversion time, ≤±1LSB error, and 1µA power-down current - are guaranteed across this full range.
Does the MAX114ENG+ require an external clock signal?
No, the MAX114ENG+ does not require an external clock. Its half-flash architecture uses an internal timing generator to control conversion sequencing, allowing fully autonomous operation from power-on. This eliminates clock routing, jitter concerns, and external oscillator BOM cost - a key design advantage confirmed in the Features section and Functional Diagram of the MAX114/MAX118 datasheet.
How many analog input channels does the MAX114ENG+ support?
The MAX114ENG+ supports exactly four single-ended analog input channels: IN1, IN2, IN3, and IN4. This is explicitly stated in the General Description ("4-channel MAX114"), Functional Diagram (showing only IN1–IN4 mux inputs), and Pin Description (listing only those four pins). The MAX118 variant supports eight channels; the MAX114ENG+ is strictly a 4-channel device.
What package type is used for the MAX114ENG+?
The MAX114ENG+ uses a 24-pin narrow plastic DIP (dual in-line package) with 0.3-inch body width. This is unambiguously specified in Maxim's Ordering Information table: "MAX114ENG" maps to "−40°C to +85°C" temperature range and "24 Narrow Plastic DIP" package. The "+" suffix indicates tape-and-reel packaging with full Maxim factory traceability and RoHS compliance.
Can the MAX114ENG+ operate from a 3.3V supply?
No, the MAX114ENG+ is specified only for +4.75V to +5.25V operation. The datasheet states "Single +5V Supply Operation" and lists VDD min/max as 4.75V/5.25V in Electrical Characteristics. For +3V applications, Maxim explicitly directs users to the MAX113/MAX117 family - confirming the MAX114ENG+ is incompatible with 3.3V rails without level-shifting or regulation.
MAX114ENG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- -
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- -
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- -
- Mounting Type:
- -
- Grade:
- -
- Qualification:
- -
MAX114ENG+ FAQ
1.How can I place an order for MAX114ENG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX114ENG+ 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 MAX114ENG+ reliable?
The price and inventory of MAX114ENG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX114ENG+ is usually 5 days.
3.What payment methods are accepted for MAX114ENG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX114ENG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX114ENG+?
MAX114ENG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX114ENG+ 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 MAX114ENG+?
For technical support, including MAX114ENG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX114ENG+ requirements.
6.How does Aetrix verify that MAX114ENG+ is sourced from the original manufacturer or authorized distributors?
All MAX114ENG+ 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 MAX114ENG+ meets industry standards.
7.What is the process for return or replacement of MAX114ENG+?
All MAX114ENG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX114ENG+, 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 MAX114ENG+ part is unused and in its original packaging.
Return procedure for MAX114ENG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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