MX574ALP+T - 12-Bit SAR ADC, 28-PLCC | Maxim Integrated
N.º de pieza: MX574ALP+T ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $18.5 | $18,50 |
| 10 | $16.2 | $162,00 |
| 100 | $13.95 | $1.395,00 |
| 500 | $11.8 | $5.900,00 |
| 1.000 | $10.1 | $10.100,00 |
MX574ALP+T Descripción general
What is a SAR ADC? A successive-approximation-register analog-to-digital converter is a sampling data converter that uses a binary-search algorithm to converge on the input voltage. SAR ADCs sit in the broader hierarchy of ADC architectures (SAR -> data converter -> ADC -> signal chain IC -> semiconductor) and are favored for precision instrumentation because they deliver medium-to-high resolution (12-18 bits) at medium speeds (100 kSPS to few MSPS) without the latency of delta-sigma converters or the glitch of flash converters. The MX574A belongs to the industry-standard "574/674/174" ADC family, originally industry workhorses for industrial process control.
Key features include 12-bit resolution with no missing codes over the full temperature range, a precision 10 ppm/°C (max) low-drift internal reference, a track/hold amplifier front end, and a parallel/word-wide digital interface for fast microprocessor read cycles. The device accepts 0 to +10 V or 0 to +20 V unipolar or ±5 V, ±10 V bipolar analog input ranges depending on strap configuration, and runs from ±12 V / +5 V analog supplies. Conversion time is on the order of 25 µs maximum, supporting data-acquisition rates up to ~40 kSPS at full 12-bit accuracy.
Typical applications include high-accuracy process-control front ends, digital-signal-processing front ends, high-speed data-acquisition boards, and electro-mechanical test systems. The wide input voltage ranges make the MX574ALP+T drop-in usable in legacy industrial backplanes built around +10 V signal conditioning.
When designing with this ADC, ensure the AV+/AV- analog supplies are well decoupled and that the impedance driving the analog input is well below the source-impedance budget to avoid gain errors. The internal reference can be overridden by an external reference if drift budgeting demands it.
This page synthesizes live distributor pricing, parametric drop-in alternatives, and practical design notes that complement the manufacturer datasheet for engineers evaluating the MX574ALP+T.
Alternativas directas para MX574ALP+T — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con MX574ALP+T (mismo factor de forma y huella) — difiere en Package, Architecture, Internal Reference, Mounting Type, Operating Temperature.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
MX574ALCWI+T
✅ Sustitución directa✓ En stock
$18.3 / unidad
Ver hoja de datos →MAX5741AUP-T
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
MAX174ACWI
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$12.25 / unidad
Ver hoja de datos →MAX674ACEWI+T
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
AD574AJNZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AD674AJNZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
MX574ALP+T Valores máximos y características eléctricas
| Resolución | 12 bits |
| Architecture | Successive Approximation (SAR) |
| Number of Channels | 1 |
| Conversion Method | SAR with internal track/hold |
| Input Type | Single-ended, software-strapped bipolar/unipolar |
| Rango de tensión de entrada | 0 to +10 V, 0 to +20 V, ±5 V, ±10 V (strap-selectable) |
| Conversion Time | up to 25 µs (max) |
| Throughput Rate | up to ~40 kSPS at 12 bits |
| Data Interface | Parallel (12-bit word) |
| Internal Reference | Yes - precision buried zener, 10 ppm/°C (max drift) |
| Tensión de alimentación | +12 V / -12 V / +5 V (analog and digital) |
| Temperatura de funcionamiento | 0 °C to +70 °C (commercial) |
| Encapsulado | 28-PLCC (11.51 x 11.51 mm), J-bend, QCCJ form |
| Estado RoHS | Compliant |
| Tipo de montaje | Surface Mount (PLCC socket or hand-solder) |
| Process Technology | BICMOS |
Configuración de pines de MX574ALP+T
| Pin 1 | DB11 — Data bit 11 (MSB), parallel output |
| Pin 2 | DB10 — Data bit 10, parallel output |
| Pin 3 | DB9 — Data bit 9, parallel output |
| Pin 4 | DB8 — Data bit 8, parallel output |
| Pin 5 | DB7 — Data bit 7, parallel output |
| Pin 6 | DB6 — Data bit 6, parallel output |
| Pin 7 | DB5 — Data bit 5, parallel output |
| Pin 8 | DB4 — Data bit 4, parallel output |
| Pin 9 | DB3 — Data bit 3, parallel output |
| Pin 10 | DB2 — Data bit 2, parallel output |
| Pin 11 | DB1 — Data bit 1, parallel output |
| Pin 12 | DB0 — Data bit 0 (LSB), parallel output |
| Pin 13 | STS — Status output (active low during conversion) |
| Pin 14 | MODE — Mode pin: Stand-alone (high) or interface (low) |
| Pin 15 | 10V IN — Analog input for 10 V range / ±5 V bipolar mode |
| Pin 16 | 20V IN — Analog input for 20 V range / ±10 V bipolar mode |
| Pin 17 | REF OUT — Internal +10 V reference output |
| Pin 18 | REF IN — Reference input (connects to REF OUT for internal reference) |
| Pin 19 | BIP OFF — Bipolar offset trim capacitor node |
| Pin 20 | DGND — Digital ground |
| Pin 21 | DVCC — +5 V digital supply |
| Pin 22 | R/!C — Read/Convert control input |
| Pin 23 | !CE — Chip enable (active low) |
| Pin 24 | !CS — Chip select (active low) |
| Pin 25 | !BUSY — Busy output (active low during conversion) |
| Pin 26 | AVCC — +12 V analog supply |
| Pin 27 | AVEE — -12 V analog supply |
| Pin 28 | AGND — Analog ground (PLCC pin 28; pin 1 of bevel) |
Aplicaciones típicas
MX574ALP+T es adecuado para 6 aplicacións: High-Accuracy Industrial Process Control, High-Speed Data Acquisition Boards, Digital Signal Processing Front-Ends, Electro-Mechanical Test & Measurement Systems, Legacy Medical Monitoring Equipment, Audio / DSP Test Equipment & Calibration Fixtures.
High-Accuracy Industrial Process Control
The MX574ALP+T's strap-selectable ±10 V / ±5 V / 0-10 V / 0-20 V input ranges align natively with 4-20 mA shunt-derived voltage signals in industrial PLCs and DCS front-ends. Its 12-bit no-missing-codes guarantee and 10 ppm/°C internal reference keep gain error below 1 LSB across the 0-70 °C range, critical for calibration-stable loop control. The 40 kSPS SAR architecture samples fast enough for a 60-Hz mains-rate control loop without latency artifacts that would otherwise cloud the PID output. Used at the analog front of a DAQ card sitting on a 12 V / -12 V / +5 V backplane, it removes the bill of an external reference. Companion MPNs like MAX187 or MAX197 add second-source continuity, while a precision op-amp such as OPA277 on the front end handles input-bias current at the kilohm source resistance of typical process transducers.
Recomendado
High-Speed Data Acquisition Boards
Backed by 25 µs / 40 kSPS conversion time and a parallel 12-bit digital bus, the MX574ALP+T serves the central converter role on multi-board DAQ racks in test-and-measurement instruments. The internal track/hold eliminates the front-end follower that would otherwise limit sample rate and adds only 60 ns of aperture, well within Nyquist for 40 kSPS. The 28-PLCC footprint with J-bend terminals accepts PLCC sockets for fast prototyping and rapid swap on the test bench, ideal for a data-acquisition engineering bring-up line. Pairing it with a dual-port RAM (e.g. IDT7134) and a sequencer FPGA like an EPM7128 captures 40 kHz-class waveform data with no-sample-loss acquisition windows. Designers can also pin it on a backplane that other DAQ slot cards plug into, because the parallel data bus interfaces cleanly with both TTL-logic MCU and 5 V tolerant ASIC clocking fabrics.
Recomendado
Digital Signal Processing Front-Ends
An MX574ALP+T placed as the analog input to a TI C31 or Motorola DSP56000 evaluation board feeds 12-bit / 40 kSPS sample streams with no glue logic into the DSP data port, opening the door to real-time spectrum analysis, modal-analysis or vibration-monitoring signal-chain prototypes. The SAR architecture is monotonic with no missing codes, so FFT amplitude is faithfully reproduced in the spectrum, and a parallel data bus side-steps SPI timing artifacts that would otherwise show up as spurious harmonics. Its ±10 V bipolar mode direct-digitizes transducer signals without anti-alias filter scaling, and the integrated reference reduces analog BOM on the front of the DSP board. Engineering teams building retro-class digital-signal-processing instruments the way the original TMS320 eval boards did benefit from this Maxim legacy ADC; modern PCIe DSP boards with FPGA fabric are paired with newer SARs like the AD7606 for higher channel counts, but the MX574ALP+T's 28-PLCC format is the right size for a single-slot evaluation daughterboard.
Recomendado
Electro-Mechanical Test & Measurement Systems
In dynamometer and motor-test rigs where transducers output ±10 V strain-gauge, load-cell or position-encoder signals, the MX574ALP+T strappable input ranges adapt the same PCB to multiple sensor types and ranges without signal-conditioning redesign. Its 12-bit no-missing-codes specification preserves small-signal resolution required to capture ripple and cogging-torque details, and the BICMOS process delivers ±5 V bipolar operation that aligns with industrial ±15 V analog rails common to motor-driver test benches. The 40 kSPS conversion rate captures fast mechanical events like axis acceleration while the parallel data bus transfers straight to a local processor for closed-loop control. Engineering integration with the MAX150/MAX155 op-amps on the front end and 12-bit DAC (e.g. MAX5742) on the analog reference side makes a complete test-system analog-frontend BOM from one Maxim supplier chain. The 28-PLCC socket-mountable package eases field-replacement schedules in test cells where ADC downtime must be eliminated.
Recomendado
Legacy Medical Monitoring Equipment
Medical physiological-monitoring front-ends in many hospitals still rely on the MX574ALP+T's wide ±10 V input range to digitize ±5 V patient-isolation-amplifier outputs through a single converter stage, eliminating the precision instrumentation amp and biasing op-amps that newer designs require. The 12-bit SAR architecture's monotonic no-missing-codes behavior is mandatory for medical ECG / pulse-oximetry equipment, where any dropped code could mask a meaningful patient event. Its on-chip reference simplifies FDA 510(k) document maintenance because the BOM and calibration drift budget can be characterized from a single Maxim datasheet rather than referenced to two supplier datasheets. The 40 kSPS throughput supports 1 kHz-class patient-monitor real-time signal refresh, ample for adult and neonatal ECG waveforms captured in the standard diagnostic bandwidth (0.05 Hz to 150 Hz). Designers pair it with isolation-barrier op-amps (e.g. MAX14770 series) on the analog side and 16 kHz digital-isolation ADI parts on the digital side for the complete patient-monitoring analog path.
Recomendado
Audio / DSP Test Equipment & Calibration Fixtures
Automated test fixtures for audio codecs and DSP boards need a 12-bit reference-grade ADC for 100 Hz-15 kHz sine and noise generation, and the MX574ALP+T's internal 10 ppm/°C reference delivers the gain-stability required to validate production-line audio DAC accuracy. The wide ±10 V input range accepts both balanced (professional audio +4 dBu) and single-ended (consumer line-level 1 Vrms) inputs without adjustment. The 28-PLCC package accepts an IC socket for hot-swap re-calibration when fixtures are pulled for service, while the parallel 12-bit interface routes captured audio samples directly to the production-test controller. Its SAR architecture is monotonic, ensuring no missing codes at the production test thresholds that distinguish Class-A from Class-B board yield, and the BICMOS process maintains PSRR that prevents automated-test-equipment switching power from leaking into the reference and degrading the calibration pass. Pairing with the MAX1253/MAX1254 audio ADC/DAC companion line delivers a calibrated audio test BOM from one Maxim-supplier chain.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MX574ALP+T — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MX574ALCWI+T | MAX5741AUP-T | MAX174ACWI | MAX674ACEWI+T | AD574AJNZ | AD674AJNZ |
|---|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Analog Devices | Analog Devices |
| Package | 28-PLCC (11.51x11.51 mm) | 28-SOIC (W) - same 28-pin family | 28-PLCC family - same package footprint | 28-SOIC (W) - same family | 28-SOIC (W) - same family | 28-PDIP - same family pinout | 28-PDIP - same family pinout |
| Resolution | 12 bits | 12 bits | 12 bits (DAC) | 12 bits | 12 bits | 12 bits | 12 bits |
| Architecture | SAR | SAR | R-2R DAC | SAR | SAR | SAR | SAR |
| Conversion Time | 25 µs | 25 µs | 30 µs (+20%) | 15 µs (-40%) | 25 µs | 15 µs (-40%) | |
| Internal Reference | Yes (10 ppm/°C max) | Yes (10 ppm/°C) | No (DAC, requires ext ref) | Yes (10 ppm/°C) | Yes (10 ppm/°C) | Yes (10 ppm/°C) | Yes (10 ppm/°C) |
| Supply Voltages | +12 V / -12 V / +5 V | +12 V / -12 V / +5 V | +12 V / -12 V / +5 V | +12 V / -12 V / +5 V | +12 V / -12 V / +5 V | +12 V / -12 V / +5 V | |
| Input Ranges | ±5/±10 V, 0-10/0-20 V (strap-selectable) | ±5/±10 V, 0-10/0-20 V | ±5/±10 V, 0-10/0-20 V | ±5/±10 V, 0-10/0-20 V | ±5/±10 V, 0-10/0-20 V | ±5/±10 V, 0-10/0-20 V | |
| Automotive AEC-Q100 Grade | Not automotive qualified | Not automotive qualified | Not automotive qualified | Not automotive qualified |
Diferenciadores clave
- Wider industrial ±10 V / 0-20 V input range than modern 12-bit SARs (frente a AD7606 (modern 16-bit SAR))
- Industry-standard legacy with multi-decade ADI/Maxim continuity (frente a Generic China-source 12-bit ADC)
- Internal 10 ppm/°C buried-zener reference eliminates external REF IC (frente a AD574AJNZ external-reference configuration)
- 28-PLCC socket-mountable package supports rapid field replacement (frente a Solder-only modern quad-pack SARs)
Notas de diseño
Decouple each of the +12 V (AVCC), -12 V (AVEE) and +5 V (DVCC) supplies with a 10 µF tantalum and a 0.1 µF ceramic placed within 5 mm of the respective pins. The MX574ALP+T's internal reference achieves 10 ppm/°C only with well-regulated supplies; supply ripple above 50 mVpp on DVCC will couple into the reference and degrade 12-bit accuracy. A separate LDO (e.g. MAX1506 +5 V) feeding DVCC from AVCC rejects digital switching noise from leaking into the analog conversion path, which is critical for SAR converters whose MSB transition can dither +/-1 LSB if digital ground is not isolated.
Use a star-ground layout with AGND (pin 28) as the single analog ground return point; route digital ground (DGND, pin 20) to the system digital ground plane with a separate trace or ferrite, joining to AGND only at the star point. Place the BPOFF (pin 19) bypass capacitor within 1 mm of the pin - this capacitor sets the bipolar-mode offset and interacts directly with the internal reference; long traces add series inductance that introduces AC gain error at the 40 kSPS throughput. The 28-PLCC package accepts a PLCC socket for prototyping but should be soldered for production to reduce thermal-EMF errors at the gold-plated contact edges.
Drive the analog input (10V IN pin 15 or 20V IN pin 16) from a low-impedance source (Rout < 100 Ω) to avoid gain error at the SAR's track/hold aperture (~60 ns). The track/hold front-end can charge 50 pC in that aperture; any source impedance above 1 kΩ will produce settling tail that skews LSB settling. When using bipolar ±5 V or ±10 V mode, strap BIP OFF (pin 19) to a 0.1 µF NP0 capacitor and tie R1 (10V IN strap) and R2 (20V IN strap) per the datasheet table for the desired range. Always use the !BUSY (pin 25) falling edge to trigger read; do not poll STS independently.
Common pitfalls when using the MX574ALP+T: (1) omitting the external reference bypass capacitor at REF OUT (pin 17) - the 10 ppm/°C spec is invalidated without it, and AC reference noise couples into conversions; (2) using BUSY (pin 25) and STS (pin 13) interchangeably - they have different timing and lead to false reads; (3) tying both 10V IN and 20V IN straps to ground by default - this short-circuits the internal divider and pulls reference currents abnormally; (4) using MODE (pin 14) in interface mode without a properly terminated !CE (pin 23) signal - the ADC holds the last conversion rather than starting a new one; (5) ignoring the 25 µs conversion time during faster CPU polling - reading before STS drops returns corrupted data.
Información de cumplimiento
RoHS compliant per Maxim/ADI product page. Industrial/commercial grade (0-70 °C); not AEC-Q100 qualified - automotive applications should consult the MAX174AEWI/T or extended-temperature ADI data. Lead-free terminal finish; halogen-free per Maxim/ADI 2010 Material Declaration.
