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Analog Devices Inc./Maxim Integrated MAX174AEWI+
- Part No.:
- MAX174AEWI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX174AEWI+.pdf
- Description:
- IC ADC 12BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX174AEWI+ from Maxim Integrated is a monolithic 12-bit successive-approximation ADC with integrated buried-zener reference (10.00 V ±2 mV), on-chip clock, and BiCMOS process. It delivers 8 μs max conversion time, 150 mW power dissipation at ±15 V supplies, and supports ±5 V or 0 to +10 V analog input ranges via pin strapping - used in high-speed data acquisition systems requiring stable, self-contained digitization.
For engineers reviewing the MAX174AEWI+ datasheet, MAX174AEWI+ pinout, MAX174AEWI+ application, or MAX174AEWI+ equivalent, this page provides verified electrical parameters, full control-mode timing, stand-alone operation guidance, bipolar/unipolar configuration details, and validated alternative part comparisons for industrial signal conditioning and embedded measurement designs.
Technical Context
The MAX174AEWI+ employs a 12-bit SAR architecture with internal 2.5 kΩ DAC output impedance and zero-crossing comparator feedback. Its control logic supports full microprocessor interface (8-/12-/16-bit buses) via CS, CE, R/C, A0, and 12/8 inputs - enabling 12-bit or 8-bit conversion cycles with byte-selectable readout.
It operates with dual ±12 V or ±15 V analog supplies (VCC/VEE), +5 V logic supply (VL), and features separate AGND/DGND pins with recommended star grounding. Internal reference drift is 10 ppm/°C, and analog input settling requires external track-and-hold (e.g., HA5320) for signals >2 Hz due to 2 MHz internal clock rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees 1 LSB = 2.44 mV for 0 to +10 V range or 4.88 mV for 0 to +20 V range. |
| Max Conversion Time | 8 μs - enables up to 125 kSPS sustained sampling in full 12-bit mode. |
| Reference Voltage | 10.00 V ±2 mV (typ) - low-drift buried zener reference eliminates need for external precision voltage source. |
| Power Dissipation | 150 mW at ±15 V - BiCMOS construction reduces thermal load vs. comparable bipolar ADCs by 3×. |
| Analog Input Ranges | Pin-strappable: 0 to +10 V, 0 to +20 V, ±5 V, or ±10 V - no external gain/offset components required for standard ranges. |
| INL (Max) | ±0.5 LSB (A/B grade, TA = +25°C) - ensures monotonicity and no missing codes over full temperature range. |
| Data Access Time | 60 ns (CL = 100 pF) - supports direct interfacing to fast 8-bit microcontrollers without wait states. |
Pinout & Package
MAX174AEWI+ is supplied in a 28-pin wide SOIC (SO) package with 0.3-inch body width and standard JEDEC MS-013AC footprint. Pin 1 is marked with a beveled corner; pin numbering follows counterclockwise convention from top-left when viewed from component side.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VL | +5 V logic supply - powers digital core and output buffers; must be decoupled with 0.1 µF ceramic + 4.7 µF tantalum to DGND. |
| 2 | 12/8 | Data format select - low = 8-bit bus mode (two-byte read), high = 12-bit word output; determines hardware data alignment. |
| 3 | CS | Chip-select input - active-low enable; must be asserted with CE for valid control cycle; ignored if CE is inactive. |
| 4 | A0 | Byte address/short-cycle input - sets conversion length (low = 12-bit, high = 8-bit) and selects MSB/LSB byte during read. |
| 5 | R/C | Read/Convert control - low = start conversion, high = enable data read; also serves as standalone trigger in simplified mode. |
| 6 | CE | Chip-enable input - active-high primary control signal; faster propagation than CS; required for all operations. |
| 7 | VCC | +12 V or +15 V analog supply - powers internal DAC, reference, and analog circuitry; bypass to AGND. |
| 8 | REFOUT | +10 V reference output - drives REFIN and BIPOFF; can source 2 mA total load across temperature with ±15 V supplies. |
| 9 | AGND | Analog ground - reference point for internal reference and analog inputs; must connect directly to system analog ground plane. |
| 10 | REFIN | Reference input - tied to REFOUT for internal reference use; accepts external 10 V reference if higher stability required. |
| 11 | VEE | –12 V or –15 V analog supply - powers negative rail of internal DAC and comparator; bypass to AGND. |
| 12 | BIPOFF | Bipolar offset input - connected to REFOUT for ±5 V/±10 V operation; enables zero-centered transfer function. |
| 13 | 10VIN | 10 V span analog input - used with AGND for 0 to +10 V or ±5 V ranges; nominal input impedance = 5 kΩ. |
| 14 | 20VIN | 20 V span analog input - used with AGND for 0 to +20 V or ±10 V ranges; nominal input impedance = 10 kΩ. |
| 15 | DGND | Digital ground - return for VL and digital outputs; joined to AGND at single point near device for noise isolation. |
| 16–27 | D0–D11 | Three-state data outputs - latched 12-bit result; output state controlled by CE/R/C/12/8/A0; high-impedance when disabled. |
| 28 | STS | Status output - open-drain, active-high during conversion; used for polling or interrupt generation to signal completion. |
Key Features
| Feature | Design Value |
|---|---|
| Complete ADC with reference and clock | Eliminates need for external oscillator, voltage reference IC, or trimming resistors - reduces BOM count and layout area. |
| No missing codes over temperature | Guaranteed monotonic 12-bit performance from –40°C to +85°C (E-grade), critical for closed-loop control accuracy. |
| 150 ns max data access time | Enables direct connection to 8-MHz Z80 or 68000-family CPUs without wait-state insertion or glue logic. |
| Pin-strappable input ranges | Supports four standard analog input configurations (0–10 V, 0–20 V, ±5 V, ±10 V) using only jumper wires - no soldering or firmware changes. |
| Stand-alone mode support | Operates without microprocessor bus: R/C pulse alone initiates conversion and controls output enable - ideal for simple sensor interfaces. |
Applications
| High-Speed Data Acquisition | Digital Signal Processing Front-End |
|---|---|
Use Scenario: Digitizing transient waveforms from oscilloscopes, vibration sensors, or RF envelope detectors at up to 125 kSPS. IC Role / Device Role / Timing Role: Primary 12-bit analog-to-digital converter with internal clock and reference - performs full conversion autonomously after R/C trigger. Use Value: 8 μs conversion time and 150 ns access enable real-time capture of fast events without DMA or FIFO buffering. |
Use Scenario: Feeding sampled audio or motor current signals into TI C54x or Analog Devices SHARC DSPs for filtering and analysis. IC Role / Device Role / Timing Role: Bus-compatible ADC interfaced via 8-bit data bus (12/8 = low) - delivers left-justified 12-bit words in two sequential reads. Use Value: Hardware byte selection (A0) and automatic trailing-zero padding eliminate software bit-shifting overhead in DSP firmware. |
| Industrial Process Monitoring | Electro-Mechanical Test Equipment |
Use Scenario: Measuring temperature (via RTD), pressure (via bridge), or position (via LVDT) in PLC I/O modules with ±5 V sensor outputs. IC Role / Device Role / Timing Role: Bipolar-input ADC configured via BIPOFF–REFOUT tie and 10VIN–AGND connection - handles zero-centered transducer signals. Use Value: Internal 10 ppm/°C reference and ±0.5 LSB INL ensure <0.05% full-scale error across 0–70°C ambient operating range. |
Use Scenario: Embedded digitizer in automated test fixtures for validating analog sensor calibration or actuator response curves. IC Role / Device Role / Timing Role: Self-contained ADC used in stand-alone mode - triggered by external test controller's R/C pulse to capture one-shot measurements. Use Value: No external clock or reference required; STS output provides ready signal to host MCU, simplifying test sequence timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7819BRZ | 12-bit SAR ADC with 1.6 μs conversion time, internal 2.5 V reference, single +3 V supply - no bipolar input support. | Targeted at low-voltage, low-power portable instrumentation; lacks ±15 V analog rail capability and pin-strappable ranges. | Select AD7819BRZ only for battery-powered 3 V systems where speed >8 μs is mandatory and bipolar inputs are unnecessary. |
| ADS7822U | 12-bit SAR ADC with 4 μs conversion, SPI interface, internal reference, single +5 V supply - serial output, no parallel bus interface. | Designed for microcontroller-based systems with limited GPIO; incompatible with 8-/12-/16-bit parallel buses and requires driver firmware. | Choose ADS7822U when board space is constrained and SPI is preferred; avoid if existing design relies on parallel microprocessor bus timing. |
Compared with MAX174AEWI+, AD7819BRZ offers higher speed but sacrifices bipolar operation and industrial supply compatibility, while ADS7822U replaces parallel control with SPI - both require PCB redesign and firmware adaptation, unlike the drop-in bus-compatible MAX174AEWI+.
Availability
MAX174AEWI+ is available at Aetrix Electronics and suitable for high-speed data acquisition, industrial process monitoring, and electro-mechanical test equipment requiring stable component supply, long-term obsolescence management, and guaranteed traceability.
Supply support for MAX174AEWI+ 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, communications, and computing markets.
The MAX174AEWI+ belongs to Maxim's industry-standard complete ADC family designed for embedded measurement systems needing self-contained, pin-configurable digitization without external clocks or references.
FAQ
What is the maximum operating temperature range for the MAX174AEWI+?
The MAX174AEWI+ is rated for –40°C to +85°C (industrial E-grade). This is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables, where parameters like INL, DNL, and reference drift are specified across this full range. Operation outside this range may cause parametric shift or permanent damage.
Does the MAX174AEWI+ require an external clock source?
No, the MAX174AEWI+ does not require an external clock source. It integrates a fully functional on-chip clock generator optimized for its 2 MHz internal timing - enabling autonomous conversion cycles once triggered by R/C or CE/CS. External clocking is neither supported nor necessary for standard operation.
Can the MAX174AEWI+ operate with ±12 V supplies instead of ±15 V?
Yes, the MAX174AEWI+ supports ±12 V analog supplies (VCC = +12 V, VEE = –12 V) per Absolute Maximum Ratings and Electrical Characteristics sections. Reference output remains stable at 10.00 V, and conversion time increases marginally to 8.5 μs max - fully within specification.
How is bipolar input range configured on the MAX174AEWI+?
Bipolar input range (±5 V or ±10 V) on the MAX174AEWI+ is configured by connecting BIPOFF to REFOUT and selecting either 10VIN (for ±5 V) or 20VIN (for ±10 V) as the analog input terminal referenced to AGND. This configuration is explicitly defined in the Functional Diagram and Input Configurations section.
Is the MAX174AEWI+ pin-compatible with MX574A or MX674A variants?
No, the MAX174AEWI+ is not pin-compatible with MX574A or MX674A. Although all three share identical pinouts and package footprints, their conversion times differ (8 μs vs. 15 μs vs. 25 μs), and internal timing parameters (e.g., tCONV, tDD) are not interchangeable - substituting without firmware timing adjustment risks data corruption.
MAX174AEWI+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 125k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- 5V, -12V, -15V
- Voltage - Supply, Digital:
- 5V, -12V, -15V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX174AEWI+ FAQ
1.How can I place an order for MAX174AEWI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX174AEWI+ 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 MAX174AEWI+ reliable?
The price and inventory of MAX174AEWI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX174AEWI+ is usually 5 days.
3.What payment methods are accepted for MAX174AEWI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX174AEWI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX174AEWI+?
MAX174AEWI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX174AEWI+ 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 MAX174AEWI+?
For technical support, including MAX174AEWI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX174AEWI+ requirements.
6.How does Aetrix verify that MAX174AEWI+ is sourced from the original manufacturer or authorized distributors?
All MAX174AEWI+ 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 MAX174AEWI+ meets industry standards.
7.What is the process for return or replacement of MAX174AEWI+?
All MAX174AEWI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX174AEWI+, 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 MAX174AEWI+ part is unused and in its original packaging.
Return procedure for MAX174AEWI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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