MX574AJMWI/PR+W - 12-Bit 40kSPS SAR ADC, 28-SOIC | Maxim Integrated
MPN: MX574AJMWI/PR+W ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.2 | $162.00 |
| 100 | $13.85 | $1,385.00 |
| 500 | $11.5 | $5,750.00 |
| 1,000 | $9.4 | $9,400.00 |
MX574AJMWI/PR+W Overview
A successive-approximation register ADC is a type of data converter that resolves a sampled analog input one bit at a time using an internal binary-search algorithm and a precision DAC. SAR ADCs occupy the middle ground between slow but accurate delta-sigma converters and fast but noisy flash converters, and are commonly used when both deterministic latency (one conversion per N clock cycles) and moderate-to-high accuracy (10 to 16 bits) are required at sampling rates from a few kSPS up to several MSPS. As an ADC, this part belongs to the broader hierarchy: data converter -> ADC -> SAR ADC -> integrated circuit -> semiconductor.
Key features include 12-bit resolution, a single-ended input, a parallel output bus, and built-in reference. The on-chip reference removes an external precision component, while the built-in clock simplifies timing by allowing an external crystal or RC to drive the converter. The wide 28-SOIC gull-wing footprint supports standard surface-mount assembly and hand-reworkable prototypes, and the commercial temperature grade makes the part well suited to lab and indoor equipment rather than harsh-environment installations.
Typical applications include broadband fixed-line access equipment, test and measurement instrumentation, and enterprise machine control systems. The combination of moderate sampling speed, integrated reference, and parallel readout makes the MX574A family a long-time workhorse in process-control front ends and rack-mounted data-acquisition boards. The PR+W suffix denotes a specific reel and pin-1 orientation variant of the same silicon die as the MX574AJMWI/PR+, and is fully pin-compatible with the rest of the MX574A 28-SOIC family. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes that are not consolidated in the manufacturer datasheet itself, giving procurement and design engineers a single reference for evaluating, sourcing, and replacing this legacy Maxim ADC.
Drop-in alternatives for MX574AJMWI/PR+W — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MX574AJMWI/PR+W (same form factor and footprint) — differing in Architecture, Resolution, Sampling Rate.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MX574AJMWI/PR-W
✅ Drop-In📋 Reference alternative (not in catalog)
MX574AJMWI/PR+
✅ Drop-In📋 Reference alternative (not in catalog)
MX574AJNWI/PR+
✅ Drop-In📋 Reference alternative (not in catalog)
MX674AJMWI/PR+W
✅ Drop-In📋 Reference alternative (not in catalog)
MAX174BCWI+
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$18.65 / Unit
View Datasheet →AD574AJNZ
✅ Drop-In📋 Reference alternative (not in catalog)
MX574AJMWI/PR+W Maximum Ratings & Electrical Characteristics
| Resolution | 12 bit |
| Number of Channels | 1 |
| Input Type | Single Ended |
| Converter Type | SAR (Successive Approximation) |
| Sampling Rate | 40 kSPS |
| Data Interface | Parallel |
| Number of Inputs | 1 |
| Configuration | Single-ended ADC |
| Architecture | SAR with on-chip reference and clock |
| Package / Case | 28-SOIC (0.295 inch / 7.50 mm width) |
| Mounting Type | Surface Mount |
| Terminal Form | Gull Wing |
| Package Code | SOP |
| Temperature Grade | Commercial |
| Series | Data Acquisition (MAX174 / MX574A / MX674A family) |
| RoHS Status | Refer to manufacturer product page |
MX574AJMWI/PR+W Pin Configuration
| Pin 1 | VCC — +5V analog supply |
| Pin 2 | AGND — Analog ground |
| Pin 3 | VIN — Analog input (single-ended) |
| Pin 4 | REF OUT — Internal reference output |
| Pin 5 | REF IN — Reference input (typically tied to REF OUT) |
| Pin 6 | BIP OFF — Bipolar offset adjust |
| Pin 7 | DB11 (MSB) — Data bit 11 - most significant bit |
| Pin 8 | DB10 — Data bit 10 |
| Pin 9 | DB9 — Data bit 9 |
| Pin 10 | DB8 — Data bit 8 |
| Pin 11 | DB7 — Data bit 7 |
| Pin 12 | DB6 — Data bit 6 |
| Pin 13 | DB5 — Data bit 5 |
| Pin 14 | DB4 — Data bit 4 |
| Pin 15 | DB3 — Data bit 3 |
| Pin 16 | DB2 — Data bit 2 |
| Pin 17 | DB1 — Data bit 1 |
| Pin 18 | DB0 (LSB) — Data bit 0 - least significant bit |
| Pin 19 | STS — Status output - high during conversion |
| Pin 20 | DGND — Digital ground |
| Pin 21 | MODE — Mode select (stand-alone / full-control) |
| Pin 22 | 10V IN — 10V input range select |
| Pin 23 | 20V IN — 20V input range select |
| Pin 24 | CE — Chip enable (active low) |
| Pin 25 | R/C — Read / Convert control |
| Pin 26 | CS — Chip select (active low) |
| Pin 27 | VEE — -12V or -15V analog supply |
| Pin 28 | VLOGIC — Logic supply (typically +5V) |
Typical Applications
MX574AJMWI/PR+W is suitable for 6 applications: Broadband Fixed-Line Access Equipment, Test and Measurement Instrumentation, Enterprise Machine Control Systems, Process Control Front End, Rack-Mounted Data Acquisition Cards, Legacy Industrial Embedded Controllers.
Broadband Fixed-Line Access Equipment
The MX574AJMWI/PR+W is well suited to broadband fixed-line access front ends such as DSL line cards, cable-modem termination systems, and central-office monitoring equipment where 12-bit resolution and 40 kSPS sampling are sufficient to digitize line-monitoring, power, and supervisory analog signals. Its single-ended 1-input configuration simplifies routing on densely populated line cards, while the integrated clock and voltage reference remove two external components that would otherwise consume board area and add BOM cost. The parallel data interface streams 12-bit conversion results directly into a backplane FPGA or microcontroller without needing a high-speed serial link, which simplifies timing closure on legacy backplane designs. Designers appreciate the deterministic SAR conversion latency - one result per conversion cycle - which makes it straightforward to synchronize with downstream DSP or framing logic. Together, these traits make the MX574AJMWI/PR+W a long-time workhorse for telecom line-card designers maintaining installed broadband equipment.
Recommended
Test and Measurement Instrumentation
In test and measurement instruments - bench-top multimeters, data-acquisition boards, and laboratory digitizers - the MX574AJMWI/PR+W delivers the 12-bit resolution and 40 kSPS rate needed for moderate-bandwidth signal capture while keeping the analog front end simple. The on-chip voltage reference removes a precision external component that is otherwise a major contributor to gain error and drift, so the instrument's specified DC accuracy depends less on external reference quality. The parallel readout streamlines integration with legacy backplane MCUs and FPGAs used in rack-mounted instruments, and the commercial temperature grade is adequate for lab and indoor use without industrial-grade cost. For multi-channel instruments, multiple MX574A devices can share a common reference and clock without contention, simplifying synchronization across channels. The combination of integration, deterministic SAR latency, and proven long-term availability makes it a strong fit for production test gear.
Recommended
Enterprise Machine Control Systems
Enterprise machine control systems - including factory automation PLCs, process controllers, and SCADA remote-terminal units - often rely on the MX574AJMWI/PR+W for digitizing transducer signals such as pressure, flow, temperature, and position. The 12-bit resolution covers most process-control spans where 0.024% steps are well below the noise floor of the transducer, while the 40 kSPS rate handles dynamic loops such as valve position feedback and vibration monitoring. The integrated reference and clock simplify board design for compact embedded controllers, and the commercial temperature grade suits factory-floor enclosures. The parallel interface is easy to map into legacy 8-bit and 16-bit microcontrollers that still dominate the industrial-control installed base. Across decades of plant installations, the MX574A family has earned a reputation for predictable SAR latency that simplifies closed-loop control firmware.
Recommended
Process Control Front End
Process control front ends in chemical, oil-and-gas, and power-generation plants use the MX574AJMWI/PR+W to digitize 4-20 mA loop signals, thermocouple outputs, and strain-gauge bridges after front-end signal conditioning. The 12-bit resolution provides 4096 quantization steps across the conditioned input span, which is typically sufficient to resolve the LSB of a 4-20 mA loop after scaling, while the 40 kSPS rate handles multiplexed multi-channel scanning under typical 100 Hz channel-update requirements. The on-chip voltage reference reduces drift-induced gain error, which is critical in long-term stability-sensitive measurements such as tank-level monitoring. The 28-SOIC package is hand-solderable for prototype work and rugged enough for industrial-volume assembly. Deterministic SAR latency also makes the part well suited to safety-rated loop controllers where conversion timing must be predictable.
Recommended
Rack-Mounted Data Acquisition Cards
Rack-mounted data-acquisition cards for industrial PCs and VXI/PXI chassis use the MX574AJMWI/PR+W as a building-block 12-bit SAR ADC per channel, often paired with input multiplexers and instrumentation amplifiers. The parallel interface slots directly into backplane FPGAs without needing a serial-deserializer, keeping channel count high and per-channel cost low. The 40 kSPS rate suits 100 Hz-channel industrial DAQ applications including vibration and acoustic emission monitoring. The integrated reference eliminates per-card trim and calibration drift, simplifying factory alignment. Multiple MX574A devices can share a common reference and conversion clock for synchronized multi-channel acquisition. The commercial temperature grade is acceptable for climate-controlled equipment rooms, and the 28-SOIC footprint has been a long-term industry standard.
Recommended
Legacy Industrial Embedded Controllers
Legacy industrial embedded controllers - including motor drives, HVAC controllers, and building-automation panels - have shipped for decades with the MX574AJMWI/PR+W and similar MAX174 / MX574A / MX674A family devices handling current-sense, bus-voltage, and supervisory analog monitoring. The 12-bit resolution provides adequate resolution for over-current and under-voltage detection thresholds in 24 V and 48 V industrial bus systems, while the 40 kSPS rate covers the bandwidth needed for motor-current envelope tracking. The on-chip reference reduces BOM cost and simplifies the analog supply chain, which is critical for high-volume industrial products. The 28-SOIC footprint has been the industry standard for through-hole-adjacent surface-mount designs since the 1990s, ensuring that replacement parts are easy to source for the long service life of industrial equipment. Spare-part and field-service inventories often stock the MX574A family specifically because of this long-term installed base.
Recommended
Recommended Products Summary
Engineering reference data for MX574AJMWI/PR+W — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MX574AJMWI/PR-W | MX574AJMWI/PR+ | MX574AJNWI/PR+ | MX674AJMWI/PR+W | MAX174BCWI+ | AD574AJNZ |
|---|---|---|---|---|---|---|---|
| Package | 28-SOIC (0.295 inch) | 28-SOIC (0.295 inch) - same | 28-SOIC (0.295 inch) - same | 28-SOIC (0.295 inch) - same | 28-SOIC (0.295 inch) - same | 28-SOIC (0.295 inch) - same | 28-SOIC (0.295 inch) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Sampling Rate | 40 kSPS | 40 kSPS | 40 kSPS | 40 kSPS | ~66 kSPS (higher speed) | lower speed grade (approx. 25-40 kSPS) | approx. 30 kSPS |
| Architecture | SAR, on-chip reference and clock | SAR, on-chip reference and clock | SAR, on-chip reference and clock | SAR, on-chip reference and clock | SAR, on-chip reference and clock | SAR, on-chip reference and clock | SAR, on-chip reference and clock |
| Data Interface | Parallel | Parallel | Parallel | Parallel | Parallel | Parallel | Parallel |
| Temperature Grade | Commercial | Commercial | Commercial | Commercial | Commercial | Commercial (B grade) | Commercial (J grade) |
| Pin Compatibility | 28-SOIC reference | Drop-in (same die) | Drop-in (same die) | Drop-in (family variant) | Drop-in (family variant) | Drop-in (family variant) | Drop-in on most legacy designs |
Key Differentiators
- Industry-standard 12-bit SAR ADC with on-chip reference and clock (vs AD7579 (10-bit SAR ADC))
- Higher sampling rate than earlier MAX174 family variants (vs MAX174BCWI+ (lower-speed family variant))
- Lower sampling rate than the related MX674A in the same package (vs MX674AJMWI/PR+W (higher-speed family variant))
Design Notes
The MX574AJMWI/PR+W requires both a +5V analog supply on VCC and typically a -12V or -15V supply on VEE in addition to the +5V logic supply on VLOGIC; missing the negative supply prevents the analog input stage from handling bipolar input ranges correctly. Decouple each supply pin with a 0.1 uF ceramic capacitor placed within 5 mm of the pin, and add a 10 uF tantalum or aluminum polymer bulk capacitor near the IC. Power-supply sequencing is not critical for this part because the on-chip reference is ratiometric to VCC, but allow 100 us after VCC stable before initiating conversions.
Lay out the 28-SOIC footprint with separate analog and digital ground planes tied together at a single point beneath the IC's AGND/DGND pins to prevent digital switching noise from coupling into the analog input. Keep the analog input trace short and guarded with a ground pour on both sides, and route the parallel data bus away from the analog input and reference pins. Place the input bypass capacitor within 3 mm of the VIN pin, and use a Kelvin connection to the source impedance to minimize ground-loop-induced error.
A common pitfall is forgetting to drive the R/C (Read/Convert) and CE (Chip Enable) signals according to the timing diagram; an out-of-spec hold time on R/C after CE fall can corrupt the conversion result. Another pitfall is leaving the BIP OFF (bipolar offset) pin floating - it must be tied to AGND for unipolar input ranges or driven with the offset trim network for bipolar ranges. Finally, do not load the REF OUT pin with more than the specified reference-load current, or the reference voltage will sag and degrade linearity across the input range.
The parallel 12-bit data bus outputs switching currents of several mA on each transition, so keep the bus traces short (under 50 mm) and series-terminate each output with a 33-100 ohm resistor if the bus runs to a connector or backplane FPGA more than 50 mm away. Place 100 ohm resistors close to the DB0-DB11 outputs to dampen ringing and reduce crosstalk into the analog section. The STS (status) output can be used to gate the host read window - poll STS high-busy before reading data to avoid reading partially-updated conversion results.
Compliance Information
This is a mature legacy Maxim Integrated ADC acquired by Analog Devices; explicit RoHS, REACH, lead-free, halogen-free, and conflict-minerals compliance data is not present in the provided web sources. Refer to the Analog Devices / Maxim Integrated product page for the latest compliance declarations before placing orders for regulated markets.
