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Analog Devices Inc./Maxim Integrated MX674AKCWI+
- Part No.:
- MX674AKCWI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MX674AKCWI+.pdf
- Description:
- IC ADC 12BIT SAR 28SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,610
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Product details
Overview
MX674AKCWI+ from Maxim Integrated is a monolithic 12-bit successive-approximation analog-to-digital converter (ADC) with integrated buried-zener voltage reference, on-chip clock, and BiCMOS process technology. It delivers 15μs max conversion time, ±1/2 LSB integral nonlinearity at +25°C, and supports 0 to +10V / 0 to +20V unipolar or ±5V / ±10V bipolar input ranges via pin strapping - used in high-speed data acquisition systems requiring stable 10V reference and microprocessor bus compatibility.
For engineers reviewing the MX674AKCWI+ datasheet, MX674AKCWI+ pinout, MX674AKCWI+ application, or MX674AKCWI+ equivalent, key selection criteria include its 15μs conversion time, 150mW power dissipation at ±15V supplies, 10ppm/°C internal reference drift, and support for 8-/12-/16-bit bus interfacing via CS/CE/R/C control logic.
Technical Context
The MX674AKCWI+ implements a 12-bit successive approximation register (SAR) architecture with a 2.5kΩ-output DAC and zero-crossing comparator. Its internal 10V buried-zener reference provides low-noise, low-drift performance without external trimming in most applications.
It operates in full-control mode (using CS, CE, R/C) or stand-alone mode (R/C only), supports both 8-bit byte-read and 12-bit word-read formats via 12/8 and A0 pins, and features three-state outputs with 150ns max data access time and 12-bit no-missing-codes guarantee over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - delivers 4096 discrete output codes with monotonic transfer function and no missing codes across operating temperature range. |
| Max Conversion Time | 15 μs - enables up to ~66.7 kSPS sustained sampling rate in high-speed data acquisition systems. |
| Integral Nonlinearity (INL) | ±1/2 LSB (typ.) at +25°C - ensures <0.012% full-scale error for precision measurement applications. |
| Reference Output | 10.00 V ±2 mV (no load) - internally generated, low-drift (10 ppm/°C), eliminates need for external reference in most designs. |
| Power Dissipation | 150 mW at ±15V supplies - achieved via BiCMOS process, reducing thermal load vs. comparable bipolar ADCs by 3×. |
| Analog Input Ranges | Configurable via pin strapping: 0 to +10V, 0 to +20V (unipolar); ±5V, ±10V (bipolar) - supports flexible sensor interface without external signal conditioning. |
| Digital Interface | Three-state parallel outputs (D0–D11), CS/CE/R/C/12/8/A0 control - compatible with 8-, 12-, and 16-bit microprocessor buses without glue logic. |
Pinout & Package
MX674AKCWI+ is housed in a 28-pin wide-body SOIC (SOIC-W) package with 0.300-inch body width and standard gull-wing lead form. Pin spacing is 0.050 inch (1.27 mm), compliant with JEDEC MS-013AC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VL | Logic supply input (+4.5V to +5.5V) - powers digital core and output buffers; decoupling required near pin. |
| 2 | 12/8 | Data format select - low = 8-bit bus mode (two-byte read), high = 12-bit word mode; determines bus interface configuration. |
| 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 conversion length (low = 12-bit, high = 8-bit) and selects MSB/LSB byte during read. |
| 5 | R/C | Read/Convert control - low = initiate conversion, high = enable data read; also serves as sole control in stand-alone mode. |
| 6 | CE | Chip-enable input - must be high to activate device; faster than CS for timing-critical conversion start. |
| 7 | VCC | Positive analog supply (+11.4V to +16.5V) - powers internal DAC, reference, and analog circuitry; requires local 4.7µF + 0.1µF decoupling. |
| 8 | REFOUT | +10V reference output - low-impedance source for BIPOFF/REFIN; can drive ≤2 mA total external load over temperature. |
| 9 | AGND | Analog ground - reference point for internal reference and analog inputs; must be tied directly to system analog ground plane. |
| 10 | REFIN | Reference input - accepts external reference or connects to REFOUT for internal reference use; 50Ω resistor required for bipolar offset calibration. |
| 11 | VEE | Negative analog supply (−11.4V to −16.5V) - powers analog section; decoupling identical to VCC required. |
| 12 | BIPOFF | Bipolar offset input - connected to REFOUT for ±5V/±10V operation; enables offset calibration via external trimmer. |
| 13 | 10VIN | 10V-span analog input - used with AGND for 0 to +10V or ±5V ranges; input impedance = 5 kΩ (typ). |
| 14 | 20VIN | 20V-span analog input - used with AGND for 0 to +20V or ±10V ranges; input impedance = 10 kΩ (typ). |
| 15 | DGND | Digital ground - return for VL, CE, CS, R/C, A0, 12/8, and D0–D11; joined to AGND at single point under IC for noise isolation. |
| 16–27 | D0–D11 | Three-state data outputs - latched 12-bit result; output valid after CE high with tDD ≤ 150 ns (CL = 100 pF). |
| 28 | STS | Status output - high during conversion, low when data ready; used for polling or interrupt generation. |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic BiCMOS construction | Reduces power dissipation to 150 mW - enables compact, low-thermal-load PCB layouts without forced air cooling. |
| On-chip 10V buried-zener reference | Delivers 10 ppm/°C tempco and <10 µVp-p noise - eliminates external reference IC and associated layout sensitivity. |
| Pin-strappable input ranges | Supports 0 to +10V, 0 to +20V, ±5V, ±10V without external resistors - simplifies design reuse across multiple sensor types. |
| No missing codes over temperature | Guaranteed monotonicity from −40°C to +85°C - ensures reliable position/speed feedback in industrial motion control. |
| 150 ns max data access time | Enables direct connection to 8-MHz Z80 or 10-MHz 8086 buses without wait states - reduces firmware overhead in legacy systems. |
Applications
| High-Speed Data Acquisition | Digital Signal Processing |
|---|---|
|
Use Scenario: Real-time digitization of vibration, acoustic, or transient electrical signals in test equipment and oscilloscopes. IC Role / Device Role / Timing Role: Primary ADC capturing analog waveforms at up to 66.7 kSPS with 12-bit resolution and deterministic 15μs latency. Use Value: Eliminates need for external sample-and-hold or reference buffering in mid-bandwidth (<100 kHz) acquisition channels. |
Use Scenario: Front-end signal conditioning in voice codecs, motor control FPGAs, and spectral analysis hardware. IC Role / Device Role / Timing Role: High-fidelity analog input stage feeding DSP engines; leverages 10V reference stability for consistent FFT bin accuracy. Use Value: Internal reference drift <10 ppm/°C ensures <0.02% full-scale gain error shift over industrial temperature range. |
| High-Accuracy Process Control | Electro-Mechanical Systems |
|
Use Scenario: Closed-loop monitoring of pressure, temperature, and flow sensors in PLC I/O modules and distributed control systems. IC Role / Device Role / Timing Role: Precision sensor interface with configurable unipolar/bipolar ranges matching 4–20 mA transmitter outputs or strain gauge bridges. Use Value: ±1/2 LSB INL and no missing codes ensure sub-0.03% linearity error - critical for NIST-traceable calibration compliance. |
Use Scenario: Position feedback in servo drives, robotic joint controllers, and CNC motion systems using resolvers or LVDTs. IC Role / Device Role / Timing Role: Bipolar ADC converting differential analog feedback into offset-binary code for real-time PID computation. Use Value: Direct ±5V/±10V support with BIPOFF pin simplifies interface to resolver-to-analog converters without level-shifting op-amps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7874KNZ | 12-bit SAR ADC with 10μs conversion time, external reference required, 24-pin DIP package. | Lacks integrated reference and clock; requires external 10V ref and timing generator - increases BOM count and layout complexity. | Select when legacy 24-pin DIP footprint is mandatory and external reference control is preferred. |
| MAX1167BCAP+ | 12-bit SAR ADC with 2.5μs conversion time, internal reference, SPI interface, 20-pin TSSOP package. | Serial interface replaces parallel bus; incompatible pinout and control protocol - requires firmware rewrite and PCB redesign. | Select for space-constrained, low-pin-count designs where SPI integration outweighs parallel bus compatibility. |
Compared with AD7874KNZ and MAX1167BCAP+, the MX674AKCWI+ uniquely combines integrated 10V reference, parallel microprocessor interface, and 15μs conversion in a single SOIC package - preserving legacy system compatibility while minimizing external components.
Availability
MX674AKCWI+ is available at Aetrix Electronics and suitable for high-speed data acquisition, digital signal processing, and high-accuracy process control applications requiring stable component supply, long-term obsolescence management, and guaranteed traceability.
Supply support for MX674AKCWI+ 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 MX674A series belongs to Maxim's industry-standard complete ADC family, designed specifically for applications demanding self-contained 12-bit conversion with minimal external components - targeting legacy microprocessor-based instrumentation and control systems.
FAQ
What is the maximum conversion time specification for the MX674AKCWI+?
The MX674AKCWI+ has a maximum conversion time of 15 μs at +25°C, with typical performance of 12 μs. This value is guaranteed across the full industrial temperature range (−40°C to +85°C) per the MX674A datasheet Electrical Characteristics table, enabling sustained sampling rates up to approximately 66.7 kSPS in time-critical applications.
Does the MX674AKCWI+ require an external voltage reference?
No, the MX674AKCWI+ does not require an external voltage reference. It integrates a precision 10V buried-zener reference with 10 ppm/°C temperature coefficient and ≤2 mV initial tolerance. REFOUT provides the reference voltage, and REFIN accepts it directly - eliminating external reference ICs in most configurations.
What analog input ranges does the MX674AKCWI+ support, and how are they selected?
The MX674AKCWI+ supports four pin-strappable analog input ranges: 0 to +10V, 0 to +20V (unipolar), and ±5V, ±10V (bipolar). Selection is made by connecting 10VIN/20VIN to AGND and configuring BIPOFF and REFIN per the datasheet Figure 13/15 - no external resistors needed beyond the 50Ω trimmer for calibration.
Can the MX674AKCWI+ interface directly with an 8-bit microprocessor bus?
Yes, the MX674AKCWI+ supports direct 8-bit bus interfacing via its 12/8 and A0 pins. When 12/8 = low, it outputs the 8 MSBs on one bus cycle (A0 = 0) and the 4 LSBs + 4 trailing zeros on the next (A0 = 1), requiring no external latches or glue logic - fully compatible with Z80, 8085, and 6800 systems.
What is the power dissipation of the MX674AKCWI+ under typical operating conditions?
Under typical ±15V analog supplies and +5V logic supply, the MX674AKCWI+ dissipates 150 mW - verified in the datasheet's "Power Dissipation" specification. This value reflects BiCMOS process optimization and remains stable across temperature, enabling reliable operation in sealed enclosures without active cooling.
MX674AKCWI+ 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MX674AKCWI+ FAQ
1.How can I place an order for MX674AKCWI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MX674AKCWI+ 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 MX674AKCWI+ reliable?
The price and inventory of MX674AKCWI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MX674AKCWI+ is usually 5 days.
3.What payment methods are accepted for MX674AKCWI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MX674AKCWI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MX674AKCWI+?
MX674AKCWI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MX674AKCWI+ 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 MX674AKCWI+?
For technical support, including MX674AKCWI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MX674AKCWI+ requirements.
6.How does Aetrix verify that MX674AKCWI+ is sourced from the original manufacturer or authorized distributors?
All MX674AKCWI+ 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 MX674AKCWI+ meets industry standards.
7.What is the process for return or replacement of MX674AKCWI+?
All MX674AKCWI+ units undergo pre-shipment inspection (PSI). If there is an issue with MX674AKCWI+, 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 MX674AKCWI+ part is unused and in its original packaging.
Return procedure for MX674AKCWI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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