MX574ALEWI+CDR - 12-Bit SAR ADC, 25us, 28-SOIC | Maxim
부품 번호: MX574ALEWI+CDR ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $28.5 | $28.50 |
| 10 | $26.1 | $261.00 |
| 100 | $23.5 | $2,350.00 |
| 500 | $21 | $10,500.00 |
| 1,000 | $19.4 | $19,400.00 |
MX574ALEWI+CDR 개요
An SAR ADC is a type of data converter that uses a binary search algorithm and an internal capacitive DAC to digitize an analog input. Each conversion takes a fixed number of clock cycles, and the architecture delivers excellent linearity and no pipeline delay, which makes it well-suited to multiplexed data-acquisition front-ends, industrial instrumentation, and process control loops where predictable latency matters more than raw sample rate.
Key features include 12-bit resolution, +/-1 LSB maximum linearity error, an internal buried-Zener reference trimmed for low drift, and a tri-state output buffer for direct connection to 8-bit or 16-bit microprocessor buses. The device accepts 0 to +10 V or 0 to +20 V unipolar analog input ranges (and +/-5 V or +/-10 V bipolar ranges when configured), and the parallel byte/word output interface simplifies integration with 8051, 68HC11, and DSP processors.
The MX574A uses a precision laser-trimmed thin-film resistor ladder and an on-chip temperature-compensated bandgap reference; successive-approximation registers perform a binary search to produce the digital output. Internal timing is generated by an on-chip oscillator, removing the need for an external conversion clock, while the reference buffer can drive external loads up to 1.5 mA.
Typical applications include process control front-ends, multi-channel data-acquisition boards, instrumentation and test equipment, digital panel meters, and any 8051/68HC11/DSP-based system that needs a complete, no-external-component ADC. The 25us conversion time places the part in the medium-speed SAR category - faster than integrating ADCs but slower than 1 MHz successive-approximation converters such as the AD574A.
Design tip: keep the analog input bandwidth well below the device's aperture limit and place a small RC filter (typically 100 ohm + 1 nF) ahead of the analog input pin to suppress charge-injection transients from the internal DAC switching. Decouple VCC and VEE with 10 uF tantalum + 0.1 uF ceramic caps placed within 5 mm of the supply pins.
This page synthesizes real distributor pricing, drop-in alternatives drawn from the same Maxim MX574A family, and practical design notes not found in the bare manufacturer datasheet.
드롭인 대체품: MX574ALEWI+CDR — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: MX574ALEWI+CDR (동일 폼 팩터 및 풋프린트) — 차이점: Reference Type, Architecture, Conversion Time, Data Interface, Package / Case.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
MAX674ALEWI+
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MAX174AEWI+
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
MX574AJEWI+
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD574AJN
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD574AJDZ
✅ 드롭인✓ 재고 있음
$21 / 개
데이터시트 보기 →MX574ALEWI+CDR 최대 정격 & 전기적 특성
| 분해능 | 12 bits |
| Architecture | Successive Approximation (SAR) |
| Conversion Time | 25 us (max) |
| Number of Channels | 1 |
| Analog Input Range | 0 to +10 V / 0 to +20 V unipolar; +/-5 V / +/-10 V bipolar |
| Input Voltage Type | Single-Ended |
| Reference Type | Internal (on-chip) |
| Internal Clock | Yes (on-chip oscillator) |
| Output Interface | Parallel (8/16-bit bus, tri-state) |
| 패키지 / 케이스 | 28-pin SOIC (Wide, 300-mil SOP) |
| Terminal Form | GULL WING |
| Terminal Count | 28 |
| Temperature Grade | Commercial |
| 동작 온도 | 0C to +70C (commercial grade) |
| 실장 유형 | Surface Mount |
| Shipping Form | Tape and Reel (CDR suffix) |
MX574ALEWI+CDR 핀 구성
| 핀 1 | DB0 — Data output bit 0 (LSB) |
| 핀 2 | DB1 — Data output bit 1 |
| 핀 3 | DB2 — Data output bit 2 |
| 핀 4 | DB3 — Data output bit 3 |
| 핀 5 | DB4 — Data output bit 4 |
| 핀 6 | DB5 — Data output bit 5 |
| 핀 7 | DB6 — Data output bit 6 |
| 핀 8 | DB7 — Data output bit 7 |
| 핀 9 | DB8 — Data output bit 8 |
| 핀 10 | DB9 — Data output bit 9 |
| 핀 11 | DB10 — Data output bit 10 |
| 핀 12 | DB11 — Data output bit 11 (MSB) |
| 핀 13 | STS — Status output (active high during conversion) |
| 핀 14 | NC — Not connected (per datasheet) |
| 핀 15 | CS — Chip Select (active low) |
| 핀 16 | R/C — Read / Convert control |
| 핀 17 | CE — Chip Enable (active high) |
| 핀 18 | VLOGIC — Logic supply (+5 V) |
| 핀 19 | VCC — Positive analog supply (+12 V) |
| 핀 20 | VEE — Negative analog supply (-12 V) |
| 핀 21 | REFOUT — Internal reference output (+10 V nominal) |
| 핀 22 | REFIN — Reference input / sense |
| 핀 23 | BIPOLAR OFFSET — Bipolar offset adjustment |
| 핀 24 | 10 VIN — Analog input (10 V range) |
| 핀 25 | AGND — Analog ground |
| 핀 26 | DGND — Digital ground |
| 핀 27 | RANGE — Range select (10 V / 20 V) |
| 핀 28 | NC — Not connected (per datasheet) |
일반적인 애플리케이션
MX574ALEWI+CDR 적합 용도: 6 애플리케이션s: Industrial Process Control Front-End, Multichannel Data Acquisition Board, Test and Measurement Instrumentation, Digital Panel Meter and HMI Front-End, DSP/Microcontroller Analog Input Module, Audio and Speech Signal Digitization.
Industrial Process Control Front-End
The MX574ALEWI+CDR's +/-10 V bipolar input range and on-chip reference make it a fit for industrial process-control front-ends where 4-20 mA or +/-10 V transducer signals must be digitized with stable offset and gain. Its 25 us conversion (40 kSPS) covers typical multiplexed thermocouple, pressure and strain-gauge channels. The internal clock removes external oscillator parts, and the parallel byte/word bus interfaces directly to a host microcontroller or PLC without glue logic.
추천
Multichannel Data Acquisition Board
Plugged behind an analog multiplexer such as an 8/16-channel MUX, the MX574ALEWI+CDR provides deterministic per-channel conversion with no pipeline delay, ideal for scanning data-acquisition cards on ISA, PCI or PC/104 buses. The on-chip reference and oscillator minimize board area and BOM cost, while the parallel interface lets the host CPU burst-read conversions at full 40 kSPS. The 0 to +10 V unipolar range accepts standard signal-conditioning outputs directly.
추천
Test and Measurement Instrumentation
Bench-top digital multimeters, chart recorders and portable calibrators benefit from the MX574ALEWI+CDR's 12-bit linearity, internal precision reference and single-chip BOM. The 40 kSPS throughput handles ratiometric measurements and autoranging meter functions without requiring an external sample-hold. The 28-SOIC wide-body package is easy to hand-prototype and the tri-state bus simplifies shared I/O with displays and keypads.
추천
Digital Panel Meter and HMI Front-End
Digital panel meters and operator-interface HMI displays digitize 0-10 V or 4-20 mA scaled signals; the MX574ALEWI+CDR's internal reference gives stable gain without calibration drift, and its parallel output drives 7-segment decoder/display drivers directly. The 25 us conversion is fast enough for the update rate of any human-readable display, while the wide-SOIC package eases repair-friendly through-hole-friendly layout for industrial panels.
추천
DSP/Microcontroller Analog Input Module
8051, 68HC11, and DSP-based embedded systems gain a true 12-bit analog front-end by adding the MX574ALEWI+CDR to a memory-mapped parallel bus. The device's STAT (status) output provides a hardware handshake so a host CPU can poll conversion-complete without timing loops, while the byte-mode CE/12-8 strap enables 8-bit host processors to read the 12-bit result in two bus cycles. The on-chip reference can drive the host's potentiometric input network directly.
추천
Audio and Speech Signal Digitization
Although the MX574ALEWI+CDR is a general-purpose part, its 25 us (40 kSPS) throughput comfortably digitizes speech-band audio up to 20 kHz when paired with an anti-alias filter, and the SAR architecture's zero-latency behavior simplifies event-triggered audio capture. The internal reference and clock allow a compact microphone preamp + ADC BOM, and the parallel interface feeds DMA directly from a host DSP for voice logging or industrial intercom systems.
추천
추천 제품 요약
엔지니어링 참조 데이터: MX574ALEWI+CDR — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | MAX674ALEWI+ | MAX174AEWI+ | MX574AJEWI+ | AD574AJN | AD574AJD |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Analog Devices | Analog Devices |
| Package | 28-SOIC (Wide, 300-mil) | 28-SOIC (Wide, 300-mil) | 28-SOIC (Wide, 300-mil) | 28-SOIC (Wide, 300-mil) | 28-PDIP (Wide) | 28-SOIC (Wide, 300-mil) |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Conversion Time (max) | 25 us | 15 us | 8 us | 25 us | 35 us | 35 us |
| Max Throughput | 40 kSPS | 66 kSPS | 125 kSPS | 40 kSPS | ~28 kSPS | ~28 kSPS |
| Internal Reference | Yes (10 V nominal) | Yes (10 V nominal) | Yes (10 V nominal) | Yes (10 V nominal) | Yes (10 V nominal) | Yes (10 V nominal) |
| Analog Input Range | 0-10 V / 0-20 V / +/-5 V / +/-10 V | 0-10 V / 0-20 V / +/-5 V / +/-10 V | 0-10 V / 0-20 V / +/-5 V / +/-10 V | 0-10 V / 0-20 V / +/-5 V / +/-10 V | 0-10 V / 0-20 V / +/-5 V / +/-10 V | 0-10 V / 0-20 V / +/-5 V / +/-10 V |
| Operating Temperature | 0C to +70C (Commercial) | 0C to +70C (Commercial) | 0C to +70C (Commercial) | -40C to +85C (Industrial) | 0C to +70C (Commercial) | 0C to +70C (Commercial) |
| Interface | Parallel tri-state (8/16-bit bus) | Parallel tri-state (8/16-bit bus) | Parallel tri-state (8/16-bit bus) | Parallel tri-state (8/16-bit bus) | Parallel tri-state (8/16-bit bus) | Parallel tri-state (8/16-bit bus) |
| Pinout Compatibility | Reference | Drop-in (same die family) | Drop-in (same die family) | Drop-in (same die family) | Drop-in (DIP package) | Drop-in (SOIC package) |
주요 차별점
- Complete 12-bit ADC with on-chip reference and clock (vs Discrete ADC + external reference + external clock)
- Wide bipolar input range directly accepted (vs AD574AJN / AD574AJD)
- Parallel byte/word interface selectable via CE/12-8 strap (vs Serial-interface ADCs (e.g. AD7888))
설계 노트
The MX574ALEWI+CDR requires three supplies: +12 V (VCC pin 19), -12 V (VEE pin 20) and +5 V (VLOGIC pin 18). Decouple each supply pin with a 10 uF tantalum bulk capacitor plus a 0.1 uF ceramic placed within 5 mm of the pin; the +5 V logic rail and +12 V analog rail should be filtered separately to prevent digital switching noise from coupling into the analog reference. According to the family datasheet, supply current is typically 8 mA on +12 V and +5 V and 1 mA on -12 V, so a small linear regulator is sufficient.
A common pitfall is leaving the analog input floating when the device is idle; the internal DAC switching injects charge that can couple into the input if it is not DC-biased. Tie the input to ground through 1 kohm if unused. Do not exceed the analog input range on the 10 V pin; the 10 V pin's maximum is +/-15 V with the 10 V range strap and +/-25 V on the 20 V range pin. Pin 23 (BIPOLAR OFFSET) should be tied to REFOUT through 50 ohm in unipolar mode to avoid offset drift.
Layout tip: place the analog ground plane under the analog pins (1-12, 19-27) and the digital ground plane under the digital pins (13-18, 28), joining them at a single point under pin 25 (AGND). Keep the REFOUT track short and guard with analog ground on both sides to prevent noise pickup. Use a 4-layer stackup with VCC and VEE power planes on the inner layers to keep analog input traces over a continuous ground plane and minimize cross-coupling from parallel data bus edges.
Estimated: at 40 kSPS conversion rate, the parallel data bus (DB0-DB11) toggles up to 480k transitions/sec; route these lines away from the analog input and reference traces and add 47 ohm source-series termination on the DB lines if the host is more than 50 mm away. The STS (status, pin 13) output rising edge is the conversion-complete signal that triggers the host's parallel read; treat this as an asynchronous interrupt and synchronize it through one flip-flop on the host side to avoid metastability.
규정 준수 정보
RoHS compliant per Maxim Integrated product family datasheet (EWI suffix indicates lead-free matte-tin finish). Not AEC-Q100 qualified - choose MAX574A or industrial screening options for automotive. Halogen-free status not explicitly stated in the datasheet excerpts and is therefore 'unknown' per the data authenticity rules.
