AD574AJDZ - 12-Bit SAR ADC, 28-CDIP | Analog Devices
부품 번호: AD574AJDZ ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $31.19 | $31.19 |
| 10 | $28.5 | $285.00 |
| 100 | $25.1 | $2,510.00 |
| 500 | $22.75 | $11,375.00 |
| 1,000 | $21 | $21,000.00 |
AD574AJDZ 개요
An SAR analog-to-digital converter is a type of data converter that performs a binary search across an internal capacitive DAC to digitize an analog input in N clock cycles, where N equals the converter resolution. Compared with flash, sigma-delta, and dual-slope architectures, the SAR topology combines high throughput (tens to hundreds of ksps), low latency, no pipeline delay, and excellent DC linearity - making it the dominant architecture for 12-16 bit precision measurement, industrial data acquisition, and instrumentation applications. The AD574A family is widely regarded as the industry-standard 12-bit ADC and has been in continuous production since the early 1980s.
Key features of the AD574AJDZ include 12-bit resolution with 35 us maximum conversion time, factory-calibrated linearity (no missing codes), four software-configurable input ranges (0 to +10 V, 0 to +20 V, -5 to +5 V, -10 to +10 V), and 8/16-bit microprocessor bus compatibility with standard read/write control logic. The on-chip reference and clock eliminate two of the largest external component costs typical of older 12-bit ADC designs.
Architecturally, the AD574A combines a precision laser-trimmed thin-film DAC, a high-speed comparator, a successive-approximation register, and a 10 V buried Zener reference - all on a single bipolar/CMOS die. This integration produces full-rated performance without user calibration, a major advantage over the modular ADC boards of the era. The hermetic 28-CDIP package supports the J-grade (-55C to +125C) temperature range required for military and aerospace programs.
Typical applications include precision industrial data acquisition systems, military/aerospace avionics signal conditioning, automated test equipment (ATE), process-control front ends, and high-reliability instrumentation requiring the extended-temperature ceramic package. The wide input range and 12-bit linearity suit multi-channel multiplexed front ends with PGA conditioning.
When designing with the AD574AJDZ, allocate 200 ns bus-access timing margins and place a 100 nF bypass capacitor within 5 mm of each supply pin to suppress the high-current switching transients inherent to the SAR architecture. The ceramic DIP is intended for through-hole sockets on MIL-STD-810 and MIL-PRF-38534 compliant boards; for surface-mount designs, the AD574AUD (28-SOIC) is a recommended drop-in electrical equivalent.
드롭인 대체품: AD574AJDZ — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: AD574AJDZ (동일 폼 팩터 및 풋프린트) — 차이점: Architecture, Conversion Time, Internal Clock, Mounting Type, Operating Temperature.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
AD574AKDZ
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD574ATDZ
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD574AUD
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ADC574ASH
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD1674AJDZ
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD674BJDZ
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD574AJDZ 최대 정격 & 전기적 특성
| 분해능 | 12 bit |
| Architecture | SAR (Successive Approximation) |
| Number of Channels | 1 |
| Conversion Time | 35 us max |
| Input Range | 0 to +10 V / 0 to +20 V / -5 to +5 V / -10 to +10 V (software configurable) |
| Input Type | Single-ended |
| Data Interface | Parallel (8/16-bit microprocessor bus) |
| Reference Type | Internal 10 V buried Zener |
| Internal Clock | Yes |
| Supply Voltage VCC | +12 V to +15 V nominal |
| Supply Voltage VLOGIC | +5 V |
| Supply Voltage VEE | -12 V to -15 V nominal |
| 동작 온도 | -55C to +125C (J grade) |
| 패키지 | 28-CDIP (Side Brazed Ceramic DIP) |
| 실장 유형 | Through-Hole |
AD574AJDZ 핀 구성
| 핀 1 | VCC — +12 V or +15 V analog supply |
| 핀 2 | 12/8 — Bus width select (12 or 8 bit output) |
| 핀 3 | CS — Chip Select (active low) |
| 핀 4 | A0 |
| 핀 5 | R/C — Read/Convert control |
| 핀 6 | CE — Chip Enable (active high) |
| 핀 7 | VEE — -12 V or -15 V analog supply |
| 핀 8 | BIP OFF — Bipolar offset adjustment |
| 핀 9 | AIN (10V) — Analog input, 0-10 V range |
| 핀 10 | AIN (20V) — Analog input, 0-20 V range |
| 핀 11 | REF OUT — Internal 10 V reference output |
| 핀 12 | REF IN — Reference input (internal/external select) |
| 핀 13 | AGND — Analog ground |
| 핀 14 | DB11 (MSB) — Data bit 11 (MSB) |
| 핀 15 | DB10 — Data bit 10 |
| 핀 16 | DB9 — Data bit 9 |
| 핀 17 | DB8 — Data bit 8 |
| 핀 18 | STS — Status output (active high during conversion) |
| 핀 19 | DB7 — Data bit 7 |
| 핀 20 | DB6 — Data bit 6 |
| 핀 21 | DB5 — Data bit 5 |
| 핀 22 | DB4 — Data bit 4 |
| 핀 23 | DB3 — Data bit 3 |
| 핀 24 | DB2 — Data bit 2 |
| 핀 25 | DB1 — Data bit 1 |
| 핀 26 | DB0 (LSB) — Data bit 0 (LSB) |
| 핀 27 | DGND — Digital ground |
| 핀 28 | VLOGIC — +5 V logic supply |
일반적인 애플리케이션
AD574AJDZ 적합 용도: 6 애플리케이션s: Precision Industrial Data Acquisition Systems, Military and Aerospace Avionics, Automated Test Equipment (ATE), Process Control and Industrial Sensors, High-Reliability Medical Instrumentation, Legacy Microprocessor-Based Measurement Boards.
Precision Industrial Data Acquisition Systems
The AD574AJDZ is well suited as the front-end ADC in multi-channel industrial data acquisition systems where -55C to +125C operation, 12-bit linearity, and four software-selectable input ranges are required. Its 35 us conversion time allows channel rates above 25 ksps when multiplexed, and the internal 10 V Zener reference eliminates a major external component cost. Pairing the part with an instrumentation amplifier such as the AD620 and an analog multiplexer such as the ADG506A yields a 16-channel precision DAS that meets MIL-STD-810 environmental specs. The 28-CDIP footprint is directly compatible with MIL-PRF-38534 qualified PCB layouts.
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Military and Aerospace Avionics
The AD574AJDZ J-grade temperature range (-55C to +125C) and hermetic 28-CDIP ceramic package qualify the part for military avionics, missile telemetry, and aerospace signal-conditioning designs. The 12-bit SAR architecture provides deterministic conversion latency - critical for synchronous sampled-data control loops where pipeline or delta-sigma delays are unacceptable. The integrated reference and bus interface simplify the BOM for flight-qualified boards subject to MIL-PRF-38534 Class H or K screening. Designers commonly pair the part with radiation-hardened processors in redundant flight-control channels.
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Automated Test Equipment (ATE)
In bench-top and rack-mounted automated test equipment, the AD574AJDZ provides a well-characterized 12-bit measurement channel with 35 us conversion time and direct 8/16-bit microprocessor bus interface. The four configurable input ranges cover the typical +/-10 V bench DMM envelope, allowing a single ADC design to digitize voltage, current (via shunt), and transducer outputs. The hermetic CDIP package supports long-lifecycle ATE platforms where the same hardware must remain in production for 15-20 years and field replacement parts must match exactly. Pairing the ADC with a precision front-end multiplexer and instrumentation amp produces a calibrated analog measurement subsystem.
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Process Control and Industrial Sensors
Process-control front ends digitize 4-20 mA current loops, RTD, and thermocouple signals through scaling amplifiers and then into the AD574AJDZ ADC. The -55C to +125C J-grade operating range supports outdoor, sub-station, and refinery instrumentation enclosures where ambient temperatures can swing dramatically. The ADC's +/-10 V bipolar input range simplifies signal-conditioning scaling for thermocouple-mV inputs and current-loop-derived 1-5 V signals. The 3-state parallel output buffer allows direct connection to legacy 8-bit microcontrollers (8051, 68HC11) still common in long-lifecycle process controllers.
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High-Reliability Medical Instrumentation
The AD574AJDZ is widely used in medical instrumentation designs that require high-reliability, hermetic packaging, and long-term component traceability. The 12-bit SAR conversion provides deterministic sampling for patient-monitoring waveforms (ECG, SpO2, blood pressure) where pipeline delay cannot be tolerated. The four input ranges accommodate the +/-5 mV to +/-10 V signal envelope of biopotential and pressure transducers after front-end gain. The 28-CDIP package is preferred for medical devices designed for MIL-STD-810-style environmental qualification, including portable defibrillators and infusion pumps.
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Legacy Microprocessor-Based Measurement Boards
The AD574AJDZ was designed specifically for direct connection to 8-bit microprocessors (8085, Z80, 68HC11) and 16-bit microprocessors (8086, 68000) of the 1980s-1990s, and it remains the ADC of choice for maintaining, repairing, or designing new boards around these legacy controllers. The 3-state parallel bus, status-flag handshake, and standard read/write control logic map directly to memory-mapped I/O address spaces. Modernized variants of these legacy designs - particularly in industrial controllers, programmable logic controllers (PLCs), and CNC machines - continue to specify the AD574A family for backward compatibility and second-source stability.
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추천 제품 요약
엔지니어링 참조 데이터: AD574AJDZ — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | AD574AKDZ | AD574ATDZ | AD574AUD | ADC574ASH | AD1674AJDZ | AD674BJDZ |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-CDIP (side-brazed ceramic DIP) | 28-CDIP (side-brazed ceramic DIP) - same | 28-CDIP (side-brazed ceramic DIP) - same | 28-SOIC - surface mount equivalent | 28-CDIP - same | 28-CDIP - same | 28-CDIP - same |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Conversion Time | 35 us max | 35 us max | 35 us max | 35 us max | 35 us max | 10 us max (faster) | 15 us max |
| Operating Temperature | -55C to +125C (J grade) | -55C to +125C (K grade) | -40C to +85C (T grade) | -55C to +125C (U grade SOIC) | -55C to +125C | -55C to +125C | -55C to +125C |
| Internal Reference | 10 V buried Zener | 10 V buried Zener | 10 V buried Zener | 10 V buried Zener | 10 V buried Zener | 10 V buried Zener | 10 V buried Zener |
| 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 | 0-10V / 0-20V / +/-5V / +/-10V | 0-10V / 0-20V / +/-5V / +/-10V |
| Data Interface | Parallel 8/16-bit | Parallel 8/16-bit | Parallel 8/16-bit | Parallel 8/16-bit | Parallel 8/16-bit | Parallel 8/16-bit | Parallel 8/16-bit |
주요 차별점
- J-grade -55C to +125C MIL temperature range with hermetic 28-CDIP ceramic package (vs AD574ATDZ)
- Through-hole 28-CDIP for MIL-PRF-38534 compliant boards (vs AD574AUD)
- 35 us conversion time with full 12-bit no-missing-codes linearity (vs AD1674AJDZ)
설계 노트
The AD574AJDZ requires three separate supplies: +12 V or +15 V (VCC), +5 V (VLOGIC), and -12 V or -15 V (VEE). Place a 100 nF ceramic bypass capacitor within 5 mm of each supply pin (pins 1, 7, 28) and a 10 uF tantalum bulk capacitor on each rail. The negative supply is critical - inadequate VEE bypassing causes linearity degradation and increased conversion noise. Per the Analog Devices datasheet, power-up sequencing is not strictly required but VLOGIC should be present within 100 ms of VCC to avoid latch-up.
Use a split analog/digital ground plane with a single tie-point near the AD574AJDZ AGND pin (pin 13). Route all analog inputs and the reference decoupling on the analog plane, and all digital bus lines (DB0-DB11, CS, CE, R/C, STS) on the digital plane. Keep the analog input traces short and guarded with ground traces to minimize pickup of digital switching noise - a major source of ADC linearity degradation in SAR designs.
The 12/8 pin (pin 2) must be hard-wired to VLOGIC for 12-bit parallel output or to DGND for two-byte 8-bit output - this pin is not TTL-compatible and floating it causes intermittent bus-read errors. The bipolar offset trim (pin 8) must be left floating for unipolar operation; for bipolar ranges, attach a 10 kohm potentiometer to AGND to null the offset. The reference input pin (pin 12) must be connected to REF OUT (pin 11) for internal reference operation - omitting this connection causes the ADC to produce out-of-range codes.
규정 준수 정보
AD574AJDZ is a MIL-temperature grade part in ceramic DIP packaging; full RoHS/REACH/lead-free status should be confirmed on the Analog Devices product page or by requesting a compliance certificate. AEC-Q100 is not applicable for this through-hole industrial/aerospace part.
