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Analog Devices Inc./Maxim Integrated MAX174BEWI+
- Part No.:
- MAX174BEWI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX174BEWI+.pdf
- Description:
- IC ADC 12BIT W/REF 28-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,890
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Product details
Overview
MAX174BEWI+ from Maxim Integrated is a monolithic 12-bit successive-approximation ADC with integrated buried-zener reference (10V ±20mV), on-chip clock, and BiCMOS process. It delivers 8μs max conversion time, ±1/2 LSB integral nonlinearity (INL) at +25°C, and 150mW power dissipation at ±15V supplies - enabling high-speed data acquisition in industrial control and DSP systems.
For engineers reviewing the MAX174BEWI+ datasheet, MAX174BEWI+ pinout, MAX174BEWI+ application, or MAX174BEWI+ equivalent, key selection criteria include unipolar/bipolar input range configurability (0–+10V, 0–+20V, ±5V, ±10V), 12/8-bit bus interface mode, stand-alone R/C-triggered operation, and temperature-stable reference performance (10ppm/°C typical).
Technical Context
The MAX174BEWI+ employs a 12-bit SAR architecture with internal 2.5kΩ DAC output impedance and zero-crossing comparator feedback. Its analog input structure supports pin-strapped ranges via 10VIN/20VIN/BIPOFF/REFIN connections, with input impedances of 5kΩ (10V span) or 10kΩ (20V span).
Digital interface uses three-state outputs controlled by CS, CE, and R/C logic, supporting full-control (CE+CS+R/C) or stand-alone (R/C-only) modes. Data format is selectable via 12/8 and A0 pins for 8-bit bus left-justified reads (MSB byte / LSB nibble+zeros) or 12-bit word output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees 4096 discrete digital codes for precise analog representation |
| Max Conversion Time | 8 μs - enables ≥125 kSPS sampling rate in high-speed acquisition systems |
| Integral Nonlinearity (INL) | ±1/2 LSB (MAX174BE grade, TA = +25°C) - ensures no missing codes and monotonic transfer function |
| Reference Voltage | 10.00 V ±20 mV (no load) - low-drift buried-zener source enabling stable full-scale calibration |
| Power Dissipation | 150 mW at ±15V - reduced 3× vs. comparable devices due to BiCMOS construction |
| Analog Input Ranges | Configurable via pin strapping: 0 to +10V, 0 to +20V, ±5V, or ±10V - supports diverse sensor and signal conditioning topologies |
| Operating Temperature | –40°C to +85°C (E-grade) - qualified for industrial embedded and harsh-environment applications |
Pinout & Package
MAX174BEWI+ is supplied in a 28-pin wide SOIC (SO) package with 0.300-inch body width and standard JEDEC MS-013AC footprint. Pin spacing is 0.050 inch, compatible with automated PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VL | Logic supply input (+4.5V to +5.5V) - powers digital core and output buffers independently from analog rails |
| 2 | 12/8 | Data mode select - low = 8-bit bus interface (two-byte read), high = 12-bit word output |
| 3 | CS | Chip-select input - must be low to enable device; used with CE/R/C for full microprocessor control |
| 4 | A0 | Byte address/short-cycle input - sets 12-bit (low) or 8-bit (high) conversion length; selects MSB/LSB byte during read |
| 5 | R/C | Read/Convert control - low = initiate conversion, high = enable data read; supports stand-alone operation |
| 6 | CE | Chip-enable input - high to activate; faster propagation than CS for timing-critical convert start |
| 7 | VCC | Positive analog supply (+11.4V to +16.5V) - powers internal DAC, reference, and analog circuitry |
| 8 | REFOUT | +10V reference output - low-noise, low-drift zener source; drives REFIN and BIPOFF internally |
| 9 | AGND | Analog ground - reference point for internal reference and analog inputs; must be tied to system analog ground |
| 10 | REFIN | Reference input - accepts external reference or connects to REFOUT for internal 10V reference use |
| 11 | VEE | Negative analog supply (–11.4V to –16.5V) - required for bipolar input operation and internal DAC bias |
| 12 | BIPOFF | Bipolar offset input - connected to REFOUT for ±5V/±10V ranges; adjustable for offset calibration |
| 13 | 10VIN | 10V span analog input - 5kΩ input impedance; used with AGND for 0–+10V or ±5V operation |
| 14 | 20VIN | 20V span analog input - 10kΩ input impedance; used with AGND for 0–+20V or ±10V operation |
| 15 | DGND | Digital ground - return for VL and digital outputs; connected to AGND at single point per layout guidelines |
| 16–27 | D0–D11 | Three-state digital outputs - latched 12-bit result; output state controlled by CE, R/C, and 12/8/A0 logic |
| 28 | STS | Status output - high during conversion, low when data valid; used for polling or interrupt generation |
Key Features
| Feature | Design Value |
|---|---|
| Complete ADC with reference and clock | Eliminates need for external precision reference, oscillator, or timing components - reduces BOM count and layout complexity |
| No missing codes over temperature | Guarantees monotonicity across –40°C to +85°C - critical for closed-loop control and real-time feedback systems |
| 150ns maximum data access time | Enables tight timing margins in 8/12/16-bit microprocessor interfaces without wait states |
| Versatile analog input configuration | Single device supports four input ranges via pin strapping - simplifies design reuse across multiple sensor types and signal levels |
| Stand-alone R/C-triggered mode | Operates without full bus interface - ideal for dedicated acquisition channels or FPGA-based systems with minimal control lines |
Applications
| Industrial Process Monitoring | Digital Signal Processing Front-End |
|---|---|
|
Use Scenario: Continuous voltage/current measurement from RTDs, strain gauges, and 4–20mA transmitters in PLC I/O modules. IC Role / Device Role / Timing Role: Primary analog-to-digital converter with configurable ±5V/±10V input range and on-chip 10V reference for absolute accuracy. Use Value: Eliminates external reference and calibration components, reducing drift-induced errors to <±1 LSB over industrial temperature range. |
Use Scenario: Digitizing audio, vibration, or sensor waveforms at ≥100 kSPS in real-time DSP systems using fixed-point processors. IC Role / Device Role / Timing Role: High-speed 12-bit sampling engine with 8μs conversion time and 150ns access time for deterministic data capture. Use Value: Enables synchronous multi-channel sampling without external track-and-hold for moderate-bandwidth signals (<1 kHz). |
| Electro-Mechanical Test Equipment | High-Accuracy Data Logging |
|
Use Scenario: Automated test fixtures measuring motor phase voltages, encoder signals, and power supply ripple in production line validation. IC Role / Device Role / Timing Role: Precision ADC with 0–+10V unipolar range and ±1/2 LSB INL for traceable calibration against metrology standards. Use Value: Delivers NIST-traceable accuracy without factory recalibration, supporting ISO/IEC 17025 compliance requirements. |
Use Scenario: Long-duration environmental monitoring (temperature, pressure, humidity) with battery-powered remote sensors. IC Role / Device Role / Timing Role: Low-power 12-bit converter operating at 150mW with flexible supply rails (±12V or ±15V) and minimal external components. Use Value: Reduces system power budget by integrating reference and clock, extending battery life in wireless sensor nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MX674AEWI+ | 15μs max conversion time; ±1/2 LSB INL at +25°C; same pinout and interface logic | Lower speed but identical accuracy grade and temperature range - suitable where 8μs is not required | Select MX674AEWI+ when system sampling rate ≤67 kSPS suffices and cost optimization is prioritized |
| AD7874KNZ | 12-bit SAR ADC with 10μs conversion, external reference required, different 28-pin DIP/SO pinout | Lacks integrated reference and clock; requires external 10V ref and timing generator | Choose AD7874KNZ only if legacy board redesign allows layout changes and external component addition |
Compared with MAX174BEWI+, MX674AEWI+ trades 37% lower speed for potential cost savings while maintaining E-grade temperature range and accuracy; AD7874KNZ demands additional reference and clock circuitry, increasing design complexity and board area despite similar resolution.
Availability
MAX174BEWI+ is available at Aetrix Electronics and suitable for industrial process monitoring, digital signal processing front-ends, and electro-mechanical test equipment requiring stable component supply and long-term manufacturability.
Supply support for MAX174BEWI+ 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.
The MAX174BEWI+ belongs to Maxim's industry-standard complete ADC family, engineered for applications demanding self-contained 12-bit conversion without external timing or reference components.
FAQ
What input voltage ranges does the MAX174BEWI+ support?
The MAX174BEWI+ supports four pin-strappable analog input ranges: 0 to +10V, 0 to +20V, ±5V, and ±10V. Selection is made by connecting 10VIN or 20VIN to the signal source and configuring BIPOFF and REFIN per the datasheet's Table 3. The MAX174BEWI+ achieves ±1/2 LSB INL in all ranges at +25°C, with full-scale step sizes of 2.44mV (10V span) or 4.88mV (20V span).
Does the MAX174BEWI+ require external components for basic operation?
Yes, but minimally: only decoupling capacitors (0.1µF ceramic + 4.7µF tantalum per supply rail) are mandatory. The MAX174BEWI+ integrates its 10V buried-zener reference, clock generator, and 12-bit DAC - eliminating need for external reference ICs, crystal oscillators, or precision resistors. External trimmers are optional and only required for fine offset/full-scale calibration.
How does the MAX174BEWI+ handle digital interface timing in 8-bit bus systems?
In 8-bit bus mode (12/8 = low), the MAX174BEWI+ outputs data left-justified: A0 = low enables the 8 MSBs on D7–D0, while A0 = high enables the 4 LSBs followed by four trailing zeros on D7–D0. This eliminates software masking. The MAX174BEWI+ guarantees 150ns max access time and supports CE/CS/R/C handshaking compatible with 8080- and 6800-family microprocessors.
What is the operating temperature range for the MAX174BEWI+?
The MAX174BEWI+ is rated for –40°C to +85°C (E-grade), validated across this full range for parameters including INL (±3/4 LSB), DNL (±1 LSB), and reference stability (10ppm/°C typical). This qualification makes the MAX174BEWI+ suitable for industrial control cabinets, outdoor instrumentation, and factory automation environments without derating.
Can the MAX174BEWI+ operate without a microprocessor interface?
Yes - the MAX174BEWI+ supports stand-alone mode using only the R/C pin: a low-to-high transition initiates conversion, and STS indicates completion. In this mode, CS and A0 are tied low, CE and 12/8 are tied high. This simplifies integration into FPGA, CPLD, or discrete logic systems where full bus control is unnecessary, reducing control-line count to one.
MAX174BEWI+ 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:
- -
MAX174BEWI+ FAQ
1.How can I place an order for MAX174BEWI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX174BEWI+ 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 MAX174BEWI+ reliable?
The price and inventory of MAX174BEWI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX174BEWI+ is usually 5 days.
3.What payment methods are accepted for MAX174BEWI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX174BEWI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX174BEWI+?
MAX174BEWI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX174BEWI+ 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 MAX174BEWI+?
For technical support, including MAX174BEWI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX174BEWI+ requirements.
6.How does Aetrix verify that MAX174BEWI+ is sourced from the original manufacturer or authorized distributors?
All MAX174BEWI+ 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 MAX174BEWI+ meets industry standards.
7.What is the process for return or replacement of MAX174BEWI+?
All MAX174BEWI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX174BEWI+, 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 MAX174BEWI+ part is unused and in its original packaging.
Return procedure for MAX174BEWI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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