MX574ALCWI+ - 12-Bit Precision SAR ADC, 28-SOIC | Maxim Integrated
料号： MX574ALCWI+ ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $24.5 | $24.50 |
| 10 | $21.95 | $219.50 |
| 100 | $18.4 | $1,840.00 |
| 500 | $15.85 | $7,925.00 |
| 1,000 | $13.95 | $13,950.00 |
MX574ALCWI+ 概述
What is a SAR ADC? A successive-approximation-register analog-to-digital converter is a type of data converter that performs a binary search across an internal DAC to determine the digital code of the input analog voltage. SAR ADCs sit in the broader hierarchy of data converters (ADC -> data converter -> data acquisition -> signal chain IC -> semiconductor) and are valued for high accuracy, low latency, deterministic latency, and lack of pipeline delay - making them ideal for multiplexed data-acquisition front ends and industrial instrumentation. The MX574A/MX674A series is a long-standing industry workhorse used in legacy designs that still require drop-in replacements today.
Key features include 12-bit resolution with no missing codes, +/-1 LSB maximum integral nonlinearity (INL) on the A-grade part, an internal 10V buried-zener reference with low drift, and flexible input ranges of 0V to 10V, 0V to 20V, +/-5V, and +/-10V selected by pin strapping. The device supports both unipolar and bipolar true-bipolar analog input operation without external signal conditioning. Throughput is up to 40 ksps using the internal clock and an external start-conversion pulse, and the device operates from +/-12V to +/-15V (or +5V digital supply). The SOIC-28 package exposes the analog inputs, reference, and digital bus separately for clean PCB layout.
Technically, the MX574ALCWI+ uses a charge-redistribution SAR architecture with a thin-film resistor-ladder DAC and laser-trimmed reference. The on-chip clock oscillator eliminates the need for an external crystal or RC timing network for most applications. Three-state outputs allow direct connection to an 8-bit, 12-bit, or 16-bit microprocessor data bus, supporting both 8-bit and 16-bit read modes. A separate -12V/-15V analog supply and +5V digital supply isolate noisy digital currents from the analog input path.
Typical applications include industrial process control and data acquisition, multiplexed analog input modules, precision instrumentation, vibration and strain-gauge signal conditioning digitizers, and medical monitoring front ends. Its single-supply bipolar input ranges also suit legacy PLC analog I/O cards and SCADA systems that still use +/-10V signal standards. Replacement situations are common, as the part is widely second-sourced by ADI/PMI and has been continuously manufactured for over three decades.
When designing with this part, ensure the analog and digital grounds are separated at the IC and joined only at one point to prevent digital ground-return currents from coupling into the analog input. A 10 uF bypass cap on the +5V digital supply and a 10 uF + 0.1 uF combination on the +/-15V analog supplies minimize noise. The reference output (REF OUT, pin 11) should be buffered if multiple loads are driven, since the internal reference cannot supply heavy current.
This page synthesizes distributor pricing, same-brand SAR ADC alternatives in SOIC-28, drop-in recommendations, and practical design notes not found on a single distributor listing, complementing the manufacturer datasheet.
直接替换替代料： MX574ALCWI+ ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： MX574ALCWI+ （相同外形与封装尺寸） ——差异在于 Architecture, Number of Inputs, Package, Resolution.
快速对比工具——选择替代料号进行并排对比：
MX574ALCWI+T
✅ 直接替换✓ 有现货
$18.3 / 个
查看数据手册 →MX574ALEWI+
✅ 直接替换📋 参考替代料（不在目录中）
MX574ALEWI+T
✅ 直接替换📋 参考替代料（不在目录中）
MX574ALCWI+ 最大额定值与电气特性
| 分辨率 | 12 bit |
| Architecture | SAR (Successive Approximation Register) |
| Number of Inputs | 1 |
| Input Type | Single-Ended |
| 采样率 | Up to 40 ksps (internal clock) |
| Conversion Time | 25 us typical (internal clock) |
| Integral Nonlinearity (INL) | ±1 LSB max (A-grade) |
| Differential Nonlinearity (DNL) | ±1 LSB max |
| Input Voltage Ranges | 0 to 10 V, 0 to 20 V, ±5 V, ±10 V (pin-strapped) |
| Analog Supply Voltage | ±12 V to ±15 V (dual) |
| Digital Supply Voltage | +5 V |
| Internal Reference | 10 V buried-zener, on-chip |
| On-Chip Clock | Yes (internal oscillator) |
| Data Bus Interface | Parallel, 8/12/16-bit selectable |
| 输出类型 | Three-state, parallel |
| 工作温度 | 0 °C to +70 °C (C-grade commercial) |
| 封装 | 28-pin SOIC (Wide) |
| 安装类型 | Surface Mount |
MX574ALCWI+ 引脚配置
| 引脚 1 | VCC — +5V digital supply |
| 引脚 2 | DGND — Digital ground |
| 引脚 3 | VEE — -12V/-15V analog supply (negative) |
| 引脚 4 | VDD — +12V/+15V analog supply (positive) |
| 引脚 5 | AGND — Analog ground |
| 引脚 6 | ANALOG IN — Analog input signal |
| 引脚 7 | BIPOLAR OFFSET — Bipolar offset adjust |
| 引脚 8 | NC — Not connected (per datasheet) |
| 引脚 9 | NC — Not connected (per datasheet) |
| 引脚 10 | REF CAP — Reference bypass capacitor |
| 引脚 11 | REF OUT — +10V internal reference output |
| 引脚 12 | REF IN — Reference input (decoupled) |
| 引脚 13 | NC — Not connected (per datasheet) |
| 引脚 14 | NC — Not connected (per datasheet) |
| 引脚 15 | DB11 (MSB) — Data bit 11 (MSB), three-state |
| 引脚 16 | DB10 — Data bit 10, three-state |
| 引脚 17 | DB9 — Data bit 9, three-state |
| 引脚 18 | DB8 — Data bit 8, three-state |
| 引脚 19 | DB7 — Data bit 7, three-state |
| 引脚 20 | DB6 — Data bit 6, three-state |
| 引脚 21 | DB5 — Data bit 5, three-state |
| 引脚 22 | DB4 — Data bit 4, three-state |
| 引脚 23 | DB3 — Data bit 3, three-state |
| 引脚 24 | DB2 — Data bit 2, three-state |
| 引脚 25 | DB1 — Data bit 1, three-state |
| 引脚 26 | DB0 (LSB) — Data bit 0 (LSB), three-state |
| 引脚 27 | STS — Status output (active low during conversion) |
| 引脚 28 | R/C — Read/Convert control input |
典型应用
MX574ALCWI+ 适用于 6 应用s: Industrial Process Control & Data Acquisition, Precision Instrumentation & Test Equipment, Strain-Gauge & Load-Cell Digitizers, Medical Monitoring Front Ends, Legacy Replacement of AD574A Designs, Multiplexed Analog Input Modules.
Industrial Process Control & Data Acquisition
The MX574ALCWI+ is ideal for industrial process control and PLC analog I/O modules where ±10V and 0-20mA-derived voltage signals must be digitized with high accuracy. According to the Maxim datasheet, its 12-bit ±1 LSB INL, internal 10V reference, and on-chip clock eliminate the need for external precision components, simplifying the BOM in a multi-channel data-acquisition card. With 25 us conversion time and up to 40 ksps throughput, the part can digitize several channels sequentially when paired with an external analog multiplexer - well-suited for SCADA and DCS analog input front ends that have used this exact part for decades.
推荐
Precision Instrumentation & Test Equipment
The MX574ALCWI+ serves precision instrumentation, bench-top multimeters, and laboratory test equipment where 12-bit absolute accuracy and an internal precision reference are required. According to the Maxim datasheet, the on-chip 10V buried-zener reference with low drift and the ±1 LSB INL provide direct traceability for instrumentation that must report absolute voltage measurements. The parallel digital interface simplifies connection to legacy microcontrollers and FPGAs that lack high-speed SPI or I2S, making the part a natural fit for replacement of older AD574A-equipped test gear.
推荐
Strain-Gauge & Load-Cell Digitizers
The MX574ALCWI+ is a long-standing choice for digitizing the output of strain-gauge bridges and load cells in weighing systems and force-measurement equipment. According to the Maxim datasheet, the bipolar ±5V and ±10V input ranges accept the differential output of strain-gauge signal conditioners directly, while the internal reference ensures stable excitation supply for the bridge. The 25 us conversion time is more than adequate for slow-changing force/weight measurements, and the SOIC-28 footprint allows compact PCB integration into handheld scales and industrial weighing terminals.
推荐
Medical Monitoring Front Ends
The MX574ALCWI+ fits medical monitoring front ends such as patient monitors, infusion-pump controllers, and bedside data-acquisition modules requiring reliable, well-characterized 12-bit conversion. According to the Maxim datasheet, the device's ±10V true-bipolar input directly accepts conditioned sensor outputs from ECG, SpO2, and temperature signal chains without extra op-amp gain stages. Its long product life (manufactured continuously since the 1980s), traceability of specifications, and medical-grade second-source ecosystem make it suitable for medical devices with multi-decade support requirements.
推荐
Legacy Replacement of AD574A Designs
The MX574ALCWI+ is the canonical drop-in second source for the industry-standard AD574A and AD574AJ from Analog Devices/PMI. According to the Maxim datasheet, the MX574A series was explicitly designed to be pin-compatible with the AD574A while adding internal clock and reference functions, simplifying designs that previously needed external timing components. Engineers maintaining AD574A-based boards in long-lifecycle equipment (military, aerospace ground test, legacy industrial controllers) can substitute the MX574ALCWI+ without PCB rework or software changes.
推荐
Multiplexed Analog Input Modules
The MX574ALCWI+ is well suited for multiplexed analog input modules where a single ADC digitizes many analog channels through an external analog multiplexer. According to the Maxim datasheet, the 25 us conversion time, hardware start-conversion pin, and three-state parallel outputs enable clean hand-off between an external mux and the ADC. With up to 40 ksps throughput and a single-channel architecture, one MX574ALCWI+ paired with a 16:1 analog mux can digitize 16 channels at approximately 2.5 ksps per channel - a common topology in legacy industrial I/O racks.
推荐
推荐产品汇总
工程参考数据： MX574ALCWI+ ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MX574ALCWI+T | MX574ALEWI+ | MX574ALEWI+T | AD574AJN |
|---|---|---|---|---|---|
| Brand | Maxim Integrated (now Analog Devices) | Maxim Integrated | Maxim Integrated | Maxim Integrated | Analog Devices |
| Package | 28-SOIC (Wide) | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-DIP (through-hole) |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Sampling Rate | Up to 40 ksps | Up to 40 ksps | Up to 40 ksps | Up to 40 ksps | Up to 35 ksps |
| Input Range | 0-10V / 0-20V / ±5V / ±10V | Same ranges | Same ranges | Same ranges | 0-10V / ±5V / ±10V (no 0-20V) |
| INL (max) | ±1 LSB (A-grade) | ±1 LSB | ±1 LSB | ±1 LSB | ±1 LSB |
| Operating Temperature | 0°C to +70°C (C-grade) | 0°C to +70°C | -40°C to +85°C | -40°C to +85°C | 0°C to +70°C |
| Internal Reference | 10V buried-zener | 10V buried-zener | 10V buried-zener | 10V buried-zener | 10V (internal) |
| Packaging | Tube (27 pcs) | Tape & Reel (2500 pcs) | Tube | Tape & Reel | Tube (DIP) |
关键差异点
- True ±10V bipolar input without external signal conditioning （对比 Modern 5V SAR ADCs (e.g. AD7606))
- Integrated 10V buried-zener reference and internal clock （对比 AD574AJN (without internal reference in some grades))
- Multi-decade product longevity and dual-source availability （对比 Newer 12-bit ADCs with shorter lifecycle)
- Pin-compatible drop-in for industry-standard AD574A （对比 AD574A/AD574AJ from Analog Devices)
设计说明
Separate analog and digital ground planes on the PCB and join them only at a single point near the IC's AGND pin (pin 5) to prevent digital return currents from coupling into the analog input. According to the Maxim datasheet, this single-point grounding is critical for achieving the datasheet INL/DNL specifications. Place the 10 uF + 0.1 uF decoupling capacitors for VCC (+5V digital, pin 1), VDD (+12V/+15V analog, pin 4), and VEE (-12V/-15V analog, pin 3) within 5 mm of their respective pins. The 28-SOIC wide-body package requires standard SOIC land patterns.
Route the analog input (pin 6) and REF OUT (pin 11) traces as short as possible, surrounded by a guarded analog ground trace on both sides, to minimize leakage and noise pickup. Per the Maxim datasheet, the analog input pin is high-impedance and susceptible to stray capacitance that can degrade AC performance; keep the input trace < 25 mm. Avoid routing digital data bus lines (DB0-DB11) parallel to the analog input trace - cross them at 90 degrees if crossing is required.
Do not load the internal +10V reference (REF OUT, pin 11) with more than a few hundred microamps or its accuracy will degrade; buffer with an external op-amp (e.g. MAX4250) if multiple loads must be driven. The R/C pin (pin 28) requires a clean pulse with proper timing - a noisy or slow R/C signal causes conversion errors. Ensure the start-conversion pulse width meets the datasheet minimum (typically 50 ns) and the conversion-complete status (STS, pin 27) is monitored properly to avoid reading stale data.
Power-up sequencing should bring up VCC (+5V digital) first or simultaneously with VDD/VEE (±15V analog) to prevent latch-up. According to the Maxim datasheet, applying analog supply voltages before VCC can forward-bias the digital ESD clamp diodes and damage the part. Use a power-on reset circuit or bulk capacitor ramp to ensure clean supply turn-on. Estimated: with 10 uF bypass caps, the supply rails will rise within ~1 ms, well below any thermal-stress concern.
合规信息
Compliance data not explicitly provided in the verified web data. The '+' suffix typically indicates lead-free plating per Maxim conventions, but specific RoHS, REACH, and halogen-free certifications should be verified with the manufacturer. AEC-Q100 is not applicable as this is not an automotive-grade part.