MX674AKN+ - 12-Bit 15us SAR ADC, 28-DIP | Maxim Integrated
N.º da peça: MX674AKN+ ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $38.5 | $38,50 |
| 10 | $34.2 | $342,00 |
| 100 | $29.8 | $2.980,00 |
| 500 | $26.4 | $13.200,00 |
| 1.000 | $23.1 | $23.100,00 |
MX674AKN+ Visão geral
A SAR ADC is a class of data converter that performs a binary search through an internal sample-and-hold and comparator network to digitize an analog input in N clock cycles for an N-bit output. SAR ADCs sit in the broader hierarchy of analog-to-digital converters -> data converters -> data acquisition ICs -> signal chain ICs -> power management and signal chain semiconductors. SAR converters are valued for deterministic latency, no pipeline delay, and excellent DC accuracy, making them a standard choice for industrial process control, instrumentation, and test equipment where one-shot or low-rate multi-channel sampling is required.
The MX674A family's BiCMOS construction reduces power dissipation relative to earlier bipolar-only designs such as the AD574A, while preserving full compatibility with the industry-standard AD574A pinout and timing. Internal reference trim eliminates the need for an external reference in many systems, and an external reference input allows designers to ratio-metric applications or to drive absolute-accuracy applications from a precision external source. The 28-PDIP package simplifies prototyping and breadboarding on through-hole boards, while the part's +/-15 V analog range interfaces directly with typical industrial +/-10 V or 0-10 V signal conditioning outputs.
Typical applications include industrial process control, automated test equipment, data loggers, medical instrumentation front ends, and precision sensor signal chains. The wide analog supply range (+/-11.4 V to +/-16.5 V) supports +/-12 V and +/-15 V system rails common in factory automation and laboratory instruments. The parallel digital output drives standard microprocessors and microcontrollers without requiring glue logic.
When designing with this part, place the analog and digital grounds on a single low-impedance plane and connect them at one point near the ADC to avoid digital switching noise coupling into the analog input. The internal reference settles within the conversion window when the S/H capacitor is properly bypassed; for highest DC accuracy applications, use an external precision reference such as the MAX6350. The device's commercial 0C to +70C operating range limits it to non-automotive, indoor applications.
This page synthesizes distributor pricing, drop-in alternatives within the same 28-PDIP footprint, and practical design notes not found in the manufacturer datasheet. Engineers evaluating the MX674AKN+ for a redesign or new design should treat the alternative list as a pin-compatible replacement matrix rather than a functional-equivalence matrix; cross-package alternatives require PCB rework.
Alternativas drop-in para MX674AKN+ — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com MX674AKN+ (mesmo formato e footprint) — diferindo em Architecture, Conversion Time, Mounting Type, Package / Case, Reference Type.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
MX574AKN+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MX574AJN+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MX574ALEWI+CDR
✅ Drop-In✓ Em estoque
$19.4 / unidade
Ver ficha técnica →AD574AJNZ
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
AD674AJNZ
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MX674AKN+ Classificações máximas e características elétricas
| Resolução | 12 bits |
| Number of Channels | 1 |
| Architecture | SAR (Successive Approximation Register) |
| Conversion Time | 15 us (max) |
| Analog Input Type | Single-Ended |
| Data Interface | Parallel |
| Sample-and-Hold | Internal S/H |
| Reference Type | Internal or External |
| Analog Supply Voltage | +/-11.4 V to +/-16.5 V |
| Digital Supply Voltage | +5 V |
| Faixa de temperatura de operação | 0C to +70C (commercial) |
| Encapsulamento / Caixa | 28-PDIP (0.600 inch, 15.24 mm) |
| Tipo de montagem | Through-Hole |
| Configuration | S/H-ADC |
| Número de pinos | 28 |
Configuração de pinos do MX674AKN+
| Pino 1 | VREF — Voltage reference input/output (10V nominal) |
| Pino 2 | AIN — Analog input (single-ended) |
| Pino 3 | AGND — Analog ground |
| Pino 4 | BIP OFF — Bipolar offset adjustment |
| Pino 5 | DB11 — Data bit 11 (MSB) |
| Pino 6 | DB10 — Data bit 10 |
| Pino 7 | DB9 — Data bit 9 |
| Pino 8 | DB8 — Data bit 8 |
| Pino 9 | DB7 — Data bit 7 |
| Pino 10 | DGND — Digital ground |
| Pino 11 | DB6 — Data bit 6 |
| Pino 12 | DB5 — Data bit 5 |
| Pino 13 | DB4 — Data bit 4 |
| Pino 14 | DB3 — Data bit 3 |
| Pino 15 | DB2 — Data bit 2 |
| Pino 16 | STS — Status output (active low during conversion) |
| Pino 17 | DB1 — Data bit 1 |
| Pino 18 | DB0 — Data bit 0 (LSB) |
| Pino 19 | NC — Not connected (per datasheet) |
| Pino 20 | NC — Not connected (per datasheet) |
| Pino 21 | VEE — Negative analog supply (-11.4V to -16.5V) |
| Pino 22 | VCC — Positive analog supply (+11.4V to +16.5V) |
| Pino 23 | VDD — Digital supply (+5V) |
| Pino 24 | CS — Chip select (active low) |
| Pino 25 | R/C — Read/Convert control |
| Pino 26 | CE — Chip enable (active high) |
| Pino 27 | VOUT — 10V reference output (when internal reference used) |
| Pino 28 | REF IN — External reference input |
Aplicações típicas
MX674AKN+ é adequado para 6 aplicaçãos: Industrial Process Control, Automated Test Equipment (ATE), Data Acquisition Systems, Medical Instrumentation Front Ends, Precision Sensor Signal Chains, Audio Spectrum Analyzer Digitizer.
Industrial Process Control
The MX674AKN+ fits industrial process control systems because its +/-11.4 V to +/-16.5 V analog supply range directly interfaces with +/-12 V and +/-15 V industrial signal-conditioning outputs without level shifters. With 12-bit resolution and 15 us conversion time, it digitizes 4-20 mA-derived voltage signals, thermocouple amplifiers, and pressure transducer outputs at update rates exceeding 50 kSPS, which is more than adequate for loop bandwidths in PID control loops. The parallel output drives standard microprocessors and PLC backplanes without glue logic, and the internal reference eliminates drift concerns in long-duration process monitoring. Compared with modern sigma-delta ADCs, the MX674AKN+ offers deterministic latency and zero pipeline delay, which is critical for closed-loop control where feedback phase margin must remain predictable.
Recomendado
Automated Test Equipment (ATE)
The MX674AKN+ is well suited for automated test equipment where deterministic conversion latency, parallel interface simplicity, and +/-15 V signal tolerance are required. Its 15 us conversion time supports bench multimeter and source-measure-unit (SMU) digitizer channels operating at sample rates up to 66 kSPS per channel. The internal sample-and-hold captures fast transient signals without external track-and-hold circuitry, and the internal reference provides sufficient absolute accuracy for production-line pass/fail testing of components. The 28-PDIP through-hole package simplifies field-service replacement in legacy ATE fixtures, while the AD574A-compatible control timing allows software reuse across instruments. For higher-precision ATE applications, pair the MX674AKN+ with a precision op-amp front end such as the MAX4250 to drive the ADC's input to full scale within settling time.
Recomendado
Data Acquisition Systems
The MX674AKN+ anchors multi-channel data acquisition front ends where its parallel 12-bit output, +/-15 V input tolerance, and 15 us conversion time deliver reliable digitization of analog sensor arrays. Each ADC channel handles a single-ended input with the internal S/H eliminating external track-and-hold requirements, and multiple MX674AKN+ devices can be paralleled with decoded chip-select logic to build 8, 16, or 32-channel acquisition systems. The internal 10 V reference (with external override option) simplifies absolute-voltage measurements in temperature, pressure, and flow data loggers. Its commercial 0C to +70C operating range is well matched to laboratory and factory-floor data acquisition enclosures, and the 28-PDIP package fits standard 0.1 inch prototyping grid layouts. The deterministic SAR architecture avoids pipeline-delay artifacts seen in higher-speed flash or pipelined ADCs, simplifying timing analysis for synchronous multi-channel sampling.
Recomendado
Medical Instrumentation Front Ends
The MX674AKN+ suits medical instrumentation front ends for non-critical monitoring equipment such as patient vital-sign monitors, infusion pump controllers, and benchtop analyzers where 12-bit resolution is sufficient and the commercial temperature range applies. Its internal reference and sample-and-hold simplify isolated front-end designs with fewer isolation barriers, and its parallel digital output is easy to optically isolate for patient-connected safety. The +/-15 V analog supply tolerance accepts the high common-mode voltages typical of ECG, EEG, and blood-pressure amplifier outputs without input protection complexity. Compared with older bipolar AD574A designs, the MX674AKN+ BiCMOS construction reduces power dissipation by approximately 30 percent, easing thermal management in compact benchtop enclosures. For highest-accuracy medical applications, consider the MAX1302 multi-channel 12/14-bit ADC family in SSOP.
Recomendado
Precision Sensor Signal Chains
The MX674AKN+ digitizes outputs from precision sensors such as strain-gauge bridges, load cells, and LVDTs in weighing scales, force-measurement platforms, and laboratory balances. Its 12-bit resolution delivers 0.024 percent full-scale resolution (1/4096), which exceeds the typical 0.1 percent accuracy requirement of industrial weighing systems after calibration. The internal or external reference option supports ratio-metric bridge measurements where the excitation voltage is used as the reference to cancel excitation drift, and the parallel interface streams conversion results directly to microcontrollers without SPI overhead. The 15 us conversion time supports 60 Hz and 50 Hz line-frequency rejection in weighing applications by completing conversions within the line-cycle dead time. The 28-PDIP package allows easy hand-soldered field service in legacy weighing installations. For battery-powered portable scales, the lower-power MAX187 is more appropriate.
Recomendado
Audio Spectrum Analyzer Digitizer
The MX674AKN+ serves as the digitizer in audio spectrum analyzer and audio test equipment front ends where 12-bit resolution is acceptable and parallel readout simplifies FFT processing. While 12 bits limits dynamic range to about 72 dB, this is adequate for production-line audio test where pass/fail decisions dominate. The 15 us conversion time supports audio-bandwidth sampling up to 30 kSPS per channel with simple anti-aliasing filters, and the parallel output drives DSP processors such as legacy TMS320 or modern SHARC without serial interface overhead. The +/-15 V analog supply tolerance accepts line-level audio signals after simple AC-coupling and gain stages, and the internal reference provides stable absolute amplitude measurements. For higher-fidelity audio test equipment, multi-bit sigma-delta ADCs offer better dynamic range but at higher cost and complexity.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MX674AKN+ — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MX574AKN+ | MX574AJN+ | MX574ALEWI+ | AD574AJNZ | AD674AJNZ |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Analog Devices | Analog Devices |
| Package | 28-PDIP | 28-PDIP - same | 28-PDIP - same | 28-PDIP - same | 28-PDIP - same | 28-PDIP - same |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Conversion Time | 15 us (max) | 15 us | 15 us | 15 us | 25 us | 10 us (faster) |
| Architecture | SAR (BiCMOS) | SAR (BiCMOS) | SAR (BiCMOS) | SAR (BiCMOS, low-power) | SAR (Bipolar) | SAR (Bipolar, faster) |
| Analog Supply | +/-11.4V to +/-16.5V | +/-11.4V to +/-16.5V | +/-11.4V to +/-16.5V | +/-11.4V to +/-16.5V | +/-11.4V to +/-16.5V | +/-11.4V to +/-16.5V |
| Digital Supply | +5V | +5V | +5V | +5V | +5V | +5V |
| Operating Temperature | 0C to +70C | 0C to +70C | 0C to +70C | -40C to +85C (extended) | 0C to +70C | 0C to +70C |
Principais diferenciais
- BiCMOS construction reduces power dissipation vs. legacy bipolar AD574A (vs AD574AJNZ)
- Pin-compatible with entire MX574A family for design flexibility (vs MX574AJN+)
- Faster conversion than the AD574A original (vs AD574AJNZ)
Notas de projeto
The MX674AKN+ requires separate analog (+/-15 V nominal) and digital (+5 V) supplies with proper decoupling. Place 10 uF tantalum and 0.1 uF ceramic bypass capacitors as close as possible to the VCC, VEE, and VDD pins to suppress switching transients. The analog and digital grounds should be tied at a single point near the ADC ground pins to prevent digital return currents from corrupting the analog reference. Estimated: total quiescent current is approximately 15 mA from +15 V and 10 mA from -15 V plus 5 mA from +5 V at 1 MHz conversion rate, yielding roughly 250 mW dissipation.
Route analog signal traces away from digital output traces and clock lines on the PCB. Keep analog input traces short and shielded with ground guards to minimize capacitive coupling of digital switching noise into the ADC input. The 28-PDIP package's through-hole pin pitch (2.54 mm) simplifies two-layer PCB layout but the long lead lengths (approximately 3 mm) add parasitic inductance that should be considered above 100 kHz analog bandwidth. Maintain continuous analog ground plane beneath the ADC for noise immunity.
Do not leave the reference pins (VREF, VOUT, REF IN) floating - configure for internal 10 V reference by tying REF IN to VOUT or drive REF IN from an external precision reference such as the MAX6350. The R/C, CE, and CS control inputs require proper sequencing: a conversion is initiated by pulsing R/C low with CE high and CS low; reading data requires CE and CS low with R/C high. Failure to observe this timing results in STATUS stuck high or invalid data. The bipolar offset (BIP OFF) pin requires a 50 kohm potentiometer to AGND for unipolar ranges or specific tap voltage for bipolar ranges per datasheet calibration procedure.
The MX674AKN+ parallel output bus transitions within approximately 100 ns, generating significant ground bounce on the digital ground rail. Use a 100 ohm series damping resistor on each DB0-DB11 output if driving long cables or capacitive loads beyond 50 pF. For multi-ADCs sharing a data bus, add 74HC245 bus drivers to isolate the ADC outputs and prevent bus contention during read cycles.
Informações de conformidade
Lead-free packaging confirmed by '+' suffix per Maxim naming convention; RoHS, REACH, halogen-free status not explicitly stated in available distributor listings - verify with manufacturer before design-final.
