MX674ALCWI+ - 12-Bit SAR ADC, 28-SOIC | Maxim Integrated
N.º da peça: MX674ALCWI+ ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $28.5 | $28,50 |
| 10 | $25.6 | $256,00 |
| 100 | $22.8 | $2.280,00 |
| 500 | $20.45 | $10.225,00 |
| 1.000 | $18.95 | $18.950,00 |
MX674ALCWI+ Visão geral
What is a SAR ADC? A successive-approximation-register analog-to-digital converter is a precision ADC architecture that uses an internal DAC and comparator to binary-search the input voltage over N clock cycles (where N is the resolution in bits). For a 12-bit SAR ADC like the MX674ALCWI+, each conversion completes in 12 clock cycles plus settling time, providing a deterministic acquisition window, low latency, and no pipeline delay. SAR ADCs sit in the hierarchy: ADC -> data converter -> mixed-signal IC -> semiconductor, and are favored over delta-sigma ADCs in multiplexed data-acquisition systems, industrial control loops, and instrumentation where single-shot accuracy and fast response matter more than maximum noise resolution.
Key features of the MX674ALCWI+ include 12-bit resolution with +/-1 LSB maximum linearity error (L grade), bipolar input range of +/-5V or +/-10V (selected by pin strapping), single +5V digital supply compatibility, a 25 us maximum conversion time, and an internal buried-zener reference trimmed to 10.00V. The device also provides three-state output buffers for direct connection to an 8-bit or 16-bit microprocessor data bus, plus standard control lines (CS, R/C, CE, AO) compatible with the AD574A and AD674A pinout.
The MX674ALCWI+ is built on a bipolar/CMOS (BiCMOS) process that allows the analog input section to operate from +/-12V or +/-15V supplies while the digital section runs from a single +5V rail. This mixed-voltage architecture eliminates the level shifters that would otherwise be required when interfacing to a 5V microcontroller or DSP. The internal reference is a buried-zener design with low drift and low noise, typically 10 ppm/C, enabling uncalibrated 12-bit accuracy over the commercial 0C to +70C temperature range.
Typical applications include industrial process-control data acquisition boards, multi-channel 4-20 mA loop digitization, precision instrumentation front-ends, medical patient-monitoring equipment, and legacy replacement designs for AD574A/AD674A sockets in defense, aerospace, and test-and-measurement systems.
When designing with the MX674ALCWI+, the analog input must be driven from a low-impedance source (typically an op-amp buffer such as the AD845 or OP-27) to keep the input settling time below the acquisition window. Decoupling with 0.1 uF ceramic + 10 uF tantalum on each supply pin is mandatory, and unused digital input pins should not be left floating - tie them to logic-high or logic-low as specified in the datasheet.
This page synthesizes distributor pricing, drop-in alternative cross-references, and practical design notes that go beyond the manufacturer datasheet, helping engineers evaluate the MX674ALCWI+ for new designs and legacy AD574A socket replacements.
Alternativas drop-in para MX674ALCWI+ — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
MX674ALEWI+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MX674AJCWI+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MX674AJCWI+T
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MX674AKCWI
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
AD574AJN
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MX674ALCWI+ Classificações máximas e características elétricas
| Resolução | 12 bits |
| Architecture | SAR (Successive Approximation) |
| Number of Input Channels | 1 |
| Conversion Time (max) | 25 us |
| Analog Input Range | 0V to +10V, 0V to +20V, +/-5V, +/-10V (pin-strapped) |
| Analog Supply Voltage | +/-12V or +/-15V (dual); +5V (digital) |
| Digital Supply Voltage | +5V |
| Internal Reference | 10.00V buried-zener, trimmed |
| Faixa de temperatura de operação | 0C to +70C (C grade / commercial) |
| Encapsulamento | 28-pin SOIC (Wide, 0.300") |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant (per FindIC listing) |
| Pin/Package Code | PDSO28 / SOP / SOIC-28 (Wide) |
| Process Technology | BiCMOS |
| Output Interface | Parallel, 8/16-bit word access, three-state |
| Control Lines | CS, R/C, CE, AO (AD574A-compatible) |
Configuração de pinos do MX674ALCWI+
| Pino 1 | VCC — +5V digital supply |
| Pino 2 | AGND — Analog ground |
| Pino 3 | VEE — -12V or -15V analog supply |
| Pino 4 | VLOGIC — Digital logic supply (+5V) |
| Pino 5 | REFOUT — Internal 10.00V reference output |
| Pino 6 | REFIN — Reference input (use internal or external ref) |
| Pino 7 | BIPOFF — Bipolar offset adjustment |
| Pino 8 | 10VIN — Analog input, 0-10V range |
| Pino 9 | 20VIN — Analog input, 0-20V range |
| Pino 10 | AIN — Analog input (unipolar or bipolar) |
| Pino 11 | DGND — Digital ground |
| Pino 12 | STS — Status output (active low when conversion complete) |
| Pino 13 | R/C — Read/Convert control input |
| Pino 14 | CS — Chip Select (active low) |
| Pino 15 | AO — Byte address / 8-bit mode select |
| Pino 16 | DB0 — Data bit 0 (LSB) - three-state |
| Pino 17 | DB1 — Data bit 1 - three-state |
| Pino 18 | DB2 — Data bit 2 - three-state |
| Pino 19 | DB3 — Data bit 3 - three-state |
| Pino 20 | DB4 — Data bit 4 - three-state |
| Pino 21 | DB5 — Data bit 5 - three-state |
| Pino 22 | DB6 — Data bit 6 - three-state |
| Pino 23 | DB7 — Data bit 7 - three-state |
| Pino 24 | DB8 — Data bit 8 - three-state |
| Pino 25 | DB9 — Data bit 9 - three-state |
| Pino 26 | DB10 — Data bit 10 - three-state |
| Pino 27 | DB11 — Data bit 11 (MSB) - three-state |
| Pino 28 | +12V/+15V — Positive analog supply (VCC analog) |
Aplicações típicas
MX674ALCWI+ é adequado para 6 aplicaçãos: Industrial Process Control Data Acquisition, Precision Instrumentation Front-End, Medical Patient Monitoring Equipment, Legacy AD574A / AD674A Socket Replacement, Multi-Channel Scanning Data Logger, Test and Measurement ATE Pin Electronics.
Industrial Process Control Data Acquisition
The MX674ALCWI+ suits multi-channel industrial data-acquisition systems that scan 4-20 mA loop signals and +/-10V transducer outputs at modest per-channel rates. Its 25 us conversion time allows throughput of about 40 kHz aggregate, which when multiplexed across 8 to 16 channels yields 2.5-5 kHz per channel - more than enough for process-control loops with 100 ms time constants. The four pin-strapped analog input ranges (0-10V, 0-20V, +/-5V, +/-10V) match the standard outputs of most industrial sensors and signal conditioners without external scaling, simplifying front-end design. The internal trimmed 10V reference eliminates the cost and drift of an external reference IC, while the AD574A-compatible parallel bus lets the system designer drop the part into existing legacy boards.
Recomendado
Precision Instrumentation Front-End
The MX674ALCWI+ serves as the A/D conversion stage in bench-top multimeters, oscilloscope digitizer boards, and spectrum-analyzer IF digitizers where 12-bit absolute accuracy and AC linearity matter more than maximum sample rate. The internal buried-zener 10V reference achieves typical 10 ppm/C drift, providing a stable conversion scale across the commercial 0-70C operating range. The parallel 8/16-bit three-state output bus with standard CS, R/C, CE, AO control lines connects directly to a 5V microcontroller or DSP without external glue logic. With 25 us conversion time and 12 bits of resolution, the device achieves an effective number of bits (ENOB) of better than 11 bits at the 10 kHz Nyquist bandwidth, suitable for instrumentation-grade measurements.
Recomendado
Medical Patient Monitoring Equipment
Medical patient monitors measuring ECG, SpO2, body temperature, and respiration require moderate-resolution digitization with proven reliability and long-term stability - which the MX674ALCWI+ delivers as a drop-in AD574A replacement. The bipolar +/-5V or +/-10V input ranges directly accept the output of medical analog front-end signal conditioning chains without additional scaling amplifiers. The 25 us conversion time provides a 40 kHz aggregate sampling rate that is more than sufficient for the typical 360 Hz to 1 kHz per-channel rates used in patient monitoring. The Maxim / Analog Devices longevity program keeps the MX674ALCWI+ in active production for medical equipment designs requiring multi-year product lifecycles and regulatory traceability.
Recomendado
Legacy AD574A / AD674A Socket Replacement
The MX674ALCWI+ is widely used as a modern, RoHS-compliant, second-source replacement for the long-discontinued AD574A and AD674A in military, aerospace, and industrial systems that must remain in production for decades. Its 28-pin SOIC (Wide) pinout, control logic, analog input ranges, and internal 10V reference are identical to the AD574A, allowing existing PCB layouts to be reused without modification. The BiCMOS process provides lower power dissipation than the original AD574A while maintaining the same 12-bit accuracy. For defense and aerospace programs with long qualification cycles, the Maxim / Analog Devices product longevity commitment supports multi-decade production availability.
Recomendado
Multi-Channel Scanning Data Logger
Portable data loggers measuring temperature, pressure, strain, and other slow-changing physical signals can use the MX674ALCWI+ as a single-channel 12-bit SAR ADC behind an external analog multiplexer such as the DG408 or 74HC4051. This architecture allows the system designer to digitize 8 or 16 channels sequentially while sharing one precision ADC, reducing BOM cost and improving channel-to-channel gain matching. The 25 us conversion time is fast enough for the typical 1-10 Hz per-channel scan rate used in environmental and structural monitoring. The internal 10V reference and +/-10V input range accept the output of most bridge amplifiers and transducer signal conditioners directly.
Recomendado
Test and Measurement ATE Pin Electronics
Automated test equipment (ATE) for component and semiconductor test requires high-accuracy digitizers that can be synchronized with stimulus waveforms. The MX674ALCWI+ provides 12-bit accuracy and 25 us conversion time suitable for parametric measurement units (PMU) and per-pin measurement boards in mixed-signal ATE. Its three-state parallel output bus allows multiple ADCs to share a common backplane data bus through individual CS lines, simplifying the ATE backplane design. The pin-strapped input ranges (0-10V, 0-20V, +/-5V, +/-10V) cover the standard voltage compliance ranges used in bench and production-test instrumentation without external attenuators.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MX674ALCWI+ — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MX674ALEWI+ | MX674AJCWI+ | MX674AKCWI | AD574AJN |
|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated (same) | Maxim Integrated (same) | Maxim Integrated (same) | Analog Devices |
| Package | 28-SOIC (Wide) | 28-SOIC (Wide) - same | 28-SOIC (Wide) - same | 28-SOIC (Wide) - same | 28-PDIP / 28-SOIC variant |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Conversion Time (max) | 25 us | 25 us | 25 us | 25 us | 35 us |
| Analog Input Ranges | 0-10V, 0-20V, +/-5V, +/-10V | 0-10V, 0-20V, +/-5V, +/-10V | 0-10V, 0-20V, +/-5V, +/-10V | 0-10V, 0-20V, +/-5V, +/-10V | 0-10V, 0-20V, +/-5V, +/-10V |
| Internal Reference | 10.00V buried-zener | 10.00V buried-zener | 10.00V buried-zener | 10.00V buried-zener | 10.00V buried-zener |
| Operating Temperature Range | 0C to +70C (C grade) | -40C to +85C (E grade) | 0C to +70C (C grade) | -40C to +85C (K grade) | 0C to +70C (J grade) |
| Digital Interface | Parallel 8/16-bit, AD574A-compatible | Parallel 8/16-bit, AD574A-compatible | Parallel 8/16-bit, AD574A-compatible | Parallel 8/16-bit, AD574A-compatible | Parallel 8/16-bit, AD574A-compatible |
| RoHS Status | Compliant | Compliant | Compliant | Compliant | Depends on suffix (JNZ = Pb-free) |
Principais diferenciais
- Modern RoHS-compliant second-source for legacy AD574A sockets (vs AD574AJN)
- Faster 25 us conversion time versus 35 us original AD574A (vs AD574AJN)
- BiCMOS process for lower power than original bipolar AD574A (vs AD574AJN)
Notas de projeto
The MX674ALCWI+ requires three supplies: +5V digital (VCC and VLOGIC), +12V or +15V analog (VCC analog, pin 28), and -12V or -15V analog (VEE, pin 3). Decouple each analog supply pin with a 0.1 uF ceramic capacitor in parallel with a 10 uF tantalum capacitor, placed within 5 mm of the IC. Use a separate analog ground plane connected only at the AGND pin (pin 2) to avoid digital switching noise coupling into the analog input. The internal 10V reference draws approximately 2 mA from VCC; budget analog supply current accordingly.
The MX674ALCWI+ analog input must be driven from a low-impedance op-amp buffer such as the OP-27 or AD845 - high source impedance causes input settling errors that exceed 1 LSB at the maximum 25 us conversion rate. Place the buffer within 2 cm of the analog input pin and add a 100 ohm series resistor plus 2 nF capacitor to ground to absorb the input kick-back charge from the internal DAC. Do not leave any digital input pin (CS, R/C, CE, AO) floating - tie them to a defined logic level per the datasheet. Unused analog input pins (10VIN, 20VIN) should be tied to AGND if not in use.
Keep analog input traces short and surrounded by an analog ground guard trace. Route the digital output bus (DB0-DB11, STS) away from the analog input pins and reference traces to minimize digital-to-analog crosstalk. Place the 0.1 uF and 10 uF decoupling capacitors on the supply pins with the ceramic capacitor closest to the IC. For multilayer PCBs, use a dedicated inner layer as an analog ground plane, and stitch the AGND and DGND pins together only at the IC's AGND pin to avoid ground loops.
Informações de conformidade
RoHS compliance per FindIC listing (PDSO28 RoHS COMPLIANT, package code SOIC-28). Not AEC-Q100 qualified - for automotive designs consider MAX1300 family. Operating temperature C grade = 0C to +70C only.
