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Analog Devices Inc./Maxim Integrated MX674AKEWI+
- Part No.:
- MX674AKEWI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MX674AKEWI+.pdf
- Description:
- IC ADC 12BIT SAR 28SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,864
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Product details
Overview
MX674AKEWI+ from Maxim Integrated is a monolithic 12-bit successive-approximation ADC with integrated buried-zener reference (10V ±0.02V), on-chip clock, and BiCMOS process. It delivers 15μs max conversion time, ±1/2 LSB integral nonlinearity at +25°C, and supports ±5V/±10V bipolar or 0–+10V/0–+20V unipolar input ranges via pin strapping - used in high-speed data acquisition systems requiring stable analog front-end performance.
For engineers reviewing the MX674AKEWI+ datasheet, MX674AKEWI+ pinout, MX674AKEWI+ application, or MX674AKEWI+ equivalent, this page provides verified electrical specifications, full control-mode timing constraints, analog input configuration guidance, and validated alternative part options for industrial signal conditioning and embedded measurement designs.
Technical Context
The MX674AKEWI+ implements a 12-bit SAR architecture with internal 2.5kΩ DAC output impedance and zero-crossing comparator feedback. Its conversion cycle is initiated by R/C low pulse in stand-alone mode or CE/CS-controlled full bus interface, with status indicated by STS output.
It features dual supply operation (VCC = +12V/+15V, VEE = –12V/–15V), logic supply VL = +5V, and separate AGND/DGND pins to minimize digital noise coupling into analog path. Input impedance is 5kΩ (10VIN) or 10kΩ (20VIN), and internal reference provides 10ppm/°C tempco with ≤2mA sourcing capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 discrete codes with no missing codes over temperature. |
| Max Conversion Time | 15 μs - enables ≥66.7 kSPS sustained sampling in full-control mode. |
| Integral Nonlinearity | ±1/2 LSB (typ.) - ensures <0.012% full-scale error for precision measurement. |
| Reference Output | 10.00 V ±20 mV - low-drift buried zener source usable directly for REFIN/BIPOFF. |
| Power Dissipation | 150 mW @ ±15V - reduced 3× vs. comparable bipolar processes, easing thermal design. |
| Analog Input Ranges | Configurable: ±5V, ±10V, 0–+10V, or 0–+20V - selected via external resistor strapping on BIPOFF/REFIN/10VIN/20VIN. |
| Digital Interface | 8-/12-/16-bit bus compatible - controlled by CS, CE, R/C, A0, and 12/8 pins with three-state D0–D11 outputs. |
Pinout & Package
MX674AKEWI+ is supplied in a 28-pin wide-body SOIC package (SOIC-W) with 0.300-inch body width and standard 1.27 mm pitch. Pin 1 is marked with a beveled corner or dot; pin numbering follows counter-clockwise convention from top-left when viewed from component side.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VL | Logic supply input - must be +4.5V to +5.5V; powers output buffers and control logic. |
| 2 | 12/8 | Data format select - low enables 8-bit bus interface (two-byte read); high enables 12-bit word output. |
| 3 | CS | Chip-select input - active-low; must be low with CE high to enable device operation. |
| 4 | A0 | Byte address/short-cycle input - low during convert start selects 12-bit mode; high selects 8-bit mode. |
| 5 | R/C | Read/Convert control - low initiates conversion; high enables data read; drives STS output state. |
| 6 | CE | Chip-enable input - active-high; primary control for conversion start and read cycles in full-control mode. |
| 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 source for external biasing of REFIN and BIPOFF. |
| 9 | AGND | Analog ground - reference node for all analog inputs and internal reference; must tie to system analog ground point. |
| 10 | REFIN | Reference input - accepts REFOUT or external reference; sets full-scale range for analog conversion. |
| 11 | VEE | Negative analog supply - –11.4V to –16.5V; required for bipolar input operation and internal DAC swing. |
| 12 | BIPOFF | Bipolar offset input - tied to REFOUT for ±5V/±10V ranges; adjusts zero-point in bipolar configurations. |
| 13 | 10VIN | 10V-span analog input - used with AGND for 0–+10V or ±5V input; 5kΩ input impedance. |
| 14 | 20VIN | 20V-span analog input - used with AGND for 0–+20V or ±10V input; 10kΩ input impedance. |
| 15 | DGND | Digital ground - return for VL, CE, CS, R/C, A0, 12/8, and D0–D11; connected to AGND at single point. |
| 16–27 | D0–D11 | Three-state data outputs - latched 12-bit result; direction and byte alignment controlled by A0 and 12/8. |
| 28 | STS | Status output - open-drain, active-high during conversion; used for polling or interrupt generation. |
Key Features
| Feature | Design Value |
|---|---|
| Complete ADC with reference & clock | Eliminates need for external oscillator or precision voltage reference, reducing BOM count and layout area. |
| 150 ns max data access time | Enables tight timing margins in microprocessor interfaces operating at >5 MHz bus speeds. |
| No missing codes over temperature | Guarantees monotonicity across –40°C to +85°C, critical for closed-loop control and safety-critical sensing. |
| Pin-strappable input ranges | Supports four standard analog input spans without external op-amps or level-shifting components. |
| BiCMOS construction | Reduces power dissipation by 3× versus legacy bipolar ADCs while maintaining 12-bit linearity. |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
|
Use Scenario: Continuous monitoring of pressure, temperature, and flow transducers in PLC-based control cabinets. IC Role / Device Role / Timing Role: Primary analog front-end digitizer interfacing 4–20mA loop receivers and precision sensor bridges. Use Value: ±1/2 LSB INL and 10ppm/°C reference stability ensure <0.02% total measurement uncertainty over 0–70°C ambient. |
Use Scenario: Digitizing waveform inputs in benchtop oscilloscopes and automated test systems with multi-channel synchronization. IC Role / Device Role / Timing Role: High-fidelity sample capture stage preceding FPGA-based FFT and analysis engines. Use Value: 15μs conversion time supports ≥66 kSPS channel rate with deterministic STS-driven read sequencing. |
| Motor Drive Current Sensing | Energy Metering Front-End |
|
Use Scenario: Isolated phase-current sampling in servo inverters using shunt resistors and isolated amplifiers. IC Role / Device Role / Timing Role: Precision current digitization with programmable gain and bipolar offset calibration. Use Value: Configurable ±5V input range and BIPOFF strapping enable direct connection to isolated amplifier outputs without level shift. |
Use Scenario: Voltage and current channel digitization in Class 0.5 smart electricity meters compliant with IEC 62053. IC Role / Device Role / Timing Role: Metrology-grade ADC for active/reactive energy computation in polyphase systems. Use Value: Buried-zener reference and 12-bit resolution meet long-term drift and linearity requirements for revenue-grade metering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7892BRZ-1 | 12-bit, 1.5μs conversion, single +5V supply, no internal reference - requires external 2.5V ref and driver amp. | Lower power (30mW), smaller footprint (20-lead SSOP), but needs more support components and lacks bipolar input flexibility. | Select for battery-powered portable instruments where speed and supply simplicity outweigh input range versatility. |
| ADS7822U | 12-bit, 4μs conversion, SPI interface, +2.7V to +5.25V supply, internal reference - no negative supply needed. | Serial interface reduces pin count; unsuitable for parallel bus systems or ±15V analog signal chains. | Prefer for space-constrained embedded controllers with existing SPI infrastructure and unipolar-only signal paths. |
Compared with AD7892BRZ-1 and ADS7822U, MX674AKEWI+ offers unique integration of ±15V analog supplies, pin-configurable bipolar/unipolar ranges, and self-contained 10V reference - making it optimal for industrial PLC I/O modules and legacy bus-based DAQ systems where component count and analog flexibility are prioritized over ultra-low power or serial interface compatibility.
Availability
MX674AKEWI+ is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, motor drive current sensing, and energy metering front-end applications requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for MX674AKEWI+ 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 high-performance analog and mixed-signal ICs for industrial, automotive, and communications markets, with emphasis on integration, reliability, and power efficiency.
The MX674AKEWI+ belongs to Maxim's industry-standard complete ADC family, engineered for plug-in replacement of legacy 12-bit converters in systems demanding minimal external components, robust noise immunity, and flexible analog input configuration.
FAQ
What is the maximum operating temperature range for MX674AKEWI+?
The MX674AKEWI+ is rated for operation from –40°C to +85°C (industrial grade). This is confirmed in the Electrical Characteristics table under "Operating Temperature Ranges" for MX_74AKE/KE/LE suffixes, and applies to the KEWI+ variant specifically. The device maintains ±1/2 LSB INL and 15μs max conversion time across this full range when powered per spec (VCC = +12V/+15V, VEE = –12V/–15V, VL = +5V).
Does MX674AKEWI+ require external clock circuitry?
No, MX674AKEWI+ does not require external clock circuitry. It integrates a precision on-chip clock generator optimized for its SAR conversion cycle. The typical internal clock frequency is 1MHz, enabling the specified 15μs max conversion time. External clocking is neither supported nor necessary - all timing is internally derived and synchronized to CE/R/C control signals.
Can MX674AKEWI+ operate with only a +5V supply?
No, MX674AKEWI+ cannot operate with only a +5V supply. It requires three independent supplies: VL = +4.5V to +5.5V (logic), VCC = +11.4V to +16.5V (positive analog), and VEE = –11.4V to –16.5V (negative analog). The ±15V analog rails are mandatory for internal DAC swing, reference regulation, and bipolar input functionality - no single-supply mode is defined or supported for MX674AKEWI+.
How is the analog input range selected on MX674AKEWI+?
The analog input range on MX674AKEWI+ is selected exclusively via external resistor strapping on pins BIPOFF, REFIN, 10VIN, and 20VIN - no register writes or internal configuration is involved. For example, connecting REFOUT to BIPOFF and tying REFIN to REFOUT configures ±5V range; leaving 20VIN open and applying signal between AGND and 10VIN selects 0–+10V. Table 3 in the datasheet defines all valid combinations and resulting transfer functions.
Is MX674AKEWI+ pin-compatible with MAX174 or MX574A?
Yes, MX674AKEWI+ is pin-compatible with MAX174 and MX574A in the same 28-pin SOIC package. All three share identical pinout, supply requirements, control logic (CS/CE/R/C/A0/12/8), and interface behavior. The key difference is conversion speed: MX674A = 15μs, MX574A = 25μs, MAX174 = 8μs. Functionally, they are drop-in replacements except where timing-critical firmware relies on exact conversion duration.
MX674AKEWI+ 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):
- 66k
- 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:
- External, Internal
- Voltage - Supply, Analog:
- ±11.4V ~ 16.5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MX674AKEWI+ FAQ
1.How can I place an order for MX674AKEWI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MX674AKEWI+ 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 MX674AKEWI+ reliable?
The price and inventory of MX674AKEWI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MX674AKEWI+ is usually 5 days.
3.What payment methods are accepted for MX674AKEWI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MX674AKEWI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MX674AKEWI+?
MX674AKEWI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MX674AKEWI+ 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 MX674AKEWI+?
For technical support, including MX674AKEWI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MX674AKEWI+ requirements.
6.How does Aetrix verify that MX674AKEWI+ is sourced from the original manufacturer or authorized distributors?
All MX674AKEWI+ 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 MX674AKEWI+ meets industry standards.
7.What is the process for return or replacement of MX674AKEWI+?
All MX674AKEWI+ units undergo pre-shipment inspection (PSI). If there is an issue with MX674AKEWI+, 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 MX674AKEWI+ part is unused and in its original packaging.
Return procedure for MX674AKEWI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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