AD574AJE - 12-Bit ADC, 28-Pin LCC | Analog Devices
MPN: AD574AJE ✓ فعالAD574AJE نمای کلی
An ADC (analog-to-digital converter) is a data converter that translates continuous analog signals into discrete digital codes. The AD574A family belongs to the successive-approximation register (SAR) architecture, which uses a comparator, an internal DAC, and a successive-approximation register to converge on the input voltage in N bit-clock cycles. SAR ADCs sit in the broader converter hierarchy: data converter -> ADC -> Nyquist ADC -> successive-approximation ADC -> integrated ADC with reference. They are valued for high accuracy, deterministic latency, and ease of microprocessor interfacing, making them a staple of industrial-instrumentation and process-control designs since the mid-1980s.
Key features include guaranteed no-missing-codes operation over temperature, full 12-bit linearity maintained across the commercial range, and a maximum conversion time of 35 us using the on-chip clock. The integrated buried-Zener reference delivers long-term stability better than bandgap-only designs, eliminating the need for an external reference component. Three-state output buffers allow direct connection to 8- or 16-bit microprocessor data buses without additional glue logic, and standard +/-10 V or 0 V to +10 V / 0 V to +20 V analog input ranges are pin-selectable.
The device implements a classic two-pass successive-approximation loop and an on-chip bipolar-offset DAC, enabling true bipolar input ranges from a single +5 V and +/-15 V analog supply. Its monolithic construction removes the calibration overhead typical of hybrid or modular ADC solutions, while the integrated clock and reference simplify PCB design and lower BOM count.
Typical applications include process-control front ends, weigh-scale and load-cell digitizers, portable instrumentation, laboratory data loggers, and any 8- or 16-bit microprocessor-based measurement system requiring a complete, board-level 12-bit acquisition channel. Designers should choose the AD574AJE when a fully integrated, calibrated ADC with on-chip reference is preferred over a discrete ADC + external reference solution, and when the LCC footprint is acceptable for the assembly process.
جایگزین‌های drop-in برای AD574AJE — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
گونه‌ها در این سری
مدل‌های هم‌سری که جایگزین مستقیم هستند برای AD574AJE (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Architecture, Operating Temperature Range, Resolution.
AD574AJN
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشده📋 جایگزین مرجع (خارج از کاتالوگ)
AD574AKE
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشده📋 جایگزین مرجع (خارج از کاتالوگ)
AD574AJW
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشده📋 جایگزین مرجع (خارج از کاتالوگ)
AD574ASE/883B
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←MAX574ALEWI+
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
MAX574AKCWI
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
AD574AJE حداکثر مقادیر مجاز و مشخصات الکتریکی
| رزولوشن | 12 bits |
| Architecture | Successive Approximation (SAR) |
| Conversion Time (max) | 35 us |
| Number of Channels | 1 |
| Analog Input Range | 0 V to +10 V / 0 V to +20 V (unipolar); +/-5 V / +/-10 V (bipolar) |
| Digital Interface | Parallel, 8- or 16-bit microprocessor bus compatible, three-state outputs |
| Reference | Internal buried-Zener, on-chip |
| Clock | Internal, on-chip |
| بسته‌بندی / کیس | 28-terminal LCC (QCCN / JLCC), no-lead |
| نوع نصب | Surface Mount |
| Pin / Terminal Count | 28 |
| Package Shape / Code | SQUARE / QCCN (per JEDEC JESD30) |
| محدوده دمای کاری | 0 C to +70 C (commercial, JE grade) |
| Temperature Grade | Commercial |
| Terminal Form | No Lead |
| Linearity | Guaranteed over temperature, no missing codes |
| Supplies | +5 V (digital), +/-15 V (analog, per datasheet) |
پیکربندی پین AD574AJE
| پین 1 | VCC (+5V) — Positive digital supply, +5 V |
| پین 2 | DGND — Digital ground |
| پین 3 | CS — Chip select input |
| پین 4 | R/C — Read/Convert input |
| پین 5 | CE — Chip enable input |
| پین 6 | VLOGIC — Logic supply, +5 V |
| پین 7 | DB11 (MSB) — Data bit 11 (MSB) |
| پین 8 | DB10 — Data bit 10 |
| پین 9 | DB9 — Data bit 9 |
| پین 10 | DB8 — Data bit 8 |
| پین 11 | DB7 — Data bit 7 |
| پین 12 | DB6 — Data bit 6 |
| پین 13 | ANALOG IN — Analog input (range per pin strapping) |
| پین 14 | REF IN/OUT — Internal reference node |
| پین 15 | AGND — Analog ground |
| پین 16 | BIP OFF — Bipolar offset adjust |
| پین 17 | DB0 (LSB) — Data bit 0 (LSB) |
| پین 18 | DB1 — Data bit 1 |
| پین 19 | DB2 — Data bit 2 |
| پین 20 | DB3 — Data bit 3 |
| پین 21 | DB4 — Data bit 4 |
| پین 22 | DB5 — Data bit 5 |
| پین 23 | STS — Status output (conversion complete) |
| پین 24 | 12/8 — Bus width select (12-bit or 8-bit) |
| پین 25 | VEE (-15V) — Negative analog supply, -15 V |
| پین 26 | VCC (+5V) — Positive digital supply, +5 V |
| پین 27 | NC — Not connected (per datasheet) |
| پین 28 | NC — Not connected (per datasheet) |
کاربردهای معمول
AD574AJE مناسب است برای 6 کاربردs: Process Control Front End, Weigh Scale / Load Cell Digitizer, Portable Instrumentation / Data Logger, Laboratory Bench Measurement Equipment, Microprocessor-Based Data Acquisition Board, Industrial Sensor Signal Conditioning Module.
Process Control Front End
The AD574AJE is well suited to industrial process-control front ends that digitize 4-20 mA or 0-10 V transducer signals into 12-bit parallel data for an 8- or 16-bit microprocessor. Its pin-selectable input ranges (0-10 V, 0-20 V, +/-5 V, +/-10 V) cover the standard ISA-style process-control signal set without external signal conditioning. The integrated buried-Zener reference and on-chip clock remove the calibration drift that plagues designs using external references, and the 35 us maximum conversion time supports scan rates of tens of kilohertz across multiple channels when multiplexed externally. Three-state outputs connect directly to the host data bus.
پیشنهادی
Weigh Scale / Load Cell Digitizer
Weigh-scale and load-cell digitizers benefit from the AD574AJE's 12-bit resolution and bipolar +/-10 V input range, which directly accept the differential output of bridge-type load cells after a single instrumentation-amplifier stage. The integrated reference ensures gain stability across temperature, while the 35 us conversion time enables settling-accurate readings at production-line throughput rates. The three-state parallel interface connects to a microcontroller or display controller without additional latches. For higher-resolution weigh scales, the MAX195BCWE provides 12 bits at similar speed with on-chip track/hold.
پیشنهادی
Portable Instrumentation / Data Logger
Portable instrumentation and battery-powered data loggers benefit from the AD574AJE's complete integration: the on-chip reference, internal clock, and three-state bus interface eliminate several support components, reducing board area and power consumption in field-portable enclosures. The bipolar input range supports direct connection to bridge, thermocouple-reference, and other low-level analog signals after a single amplifier stage. The ceramic LCC package withstands the mechanical shock and vibration typical of handheld or vehicle-mounted instruments, and the commercial temperature range covers most field-deployment scenarios without requiring MIL-spec parts.
پیشنهادی
Laboratory Bench Measurement Equipment
Laboratory bench-top instruments such as digital panel meters, calibration sources, and bench multimeters benefit from the AD574AJE's specified no-missing-codes linearity and integrated reference. The 35 us conversion time allows real-time display updates at typical panel-meter refresh rates, while the parallel 12-bit output drives LED or LCD display drivers directly. The ceramic LCC package provides long-term mechanical stability required for calibration equipment that must hold accuracy over decades. The +/-10 V bipolar range supports direct measurement of standard laboratory signal sources without additional input scaling.
پیشنهادی
Microprocessor-Based Data Acquisition Board
Microprocessor-based data acquisition boards for industrial PCs and embedded controllers benefit from the AD574AJE's 8- and 16-bit bus compatibility, which removes the need for glue logic between the ADC and host CPU. The three-state outputs connect directly to data bus lines, and the standard chip-select and read/write strobe lines interface to 8080, 8085, 68K, and 80x86 families without external latches. The integrated reference and clock allow the entire analog front end to occupy a small footprint on the ISA or PC/104 card, while the 35 us conversion supports hundreds of channels per second when multiplexed.
پیشنهادی
Industrial Sensor Signal Conditioning Module
Industrial sensor signal conditioning modules accept analog signals from strain gauges, RTDs, thermocouples, and pressure transducers and digitize them for transmission over factory networks. The AD574AJE's bipolar +/-10 V input range directly accepts amplified sensor signals, the integrated buried-Zener reference provides the low-drift voltage reference required for accurate transducer measurements, and the 12-bit parallel output drives downstream communication controllers without intermediate buffering. The ceramic LCC package withstands the wide temperature swings and vibration typical of factory-floor installations.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای AD574AJE — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | AD574AJN | AD574AKE | AD574AJW | AD574ASE | MAX574ALEWI+ | MAX574AKCWI |
|---|---|---|---|---|---|---|---|
| Package | 28-pin LCC (QCCN) | 28-pin LCC (QCCN) - same | 28-pin LCC (QCCN) - same | 28-pin LCC (QCCN) - same | 28-pin LCC (QCCN) - same | 28-pin LCC (QCCN) - same | 28-pin LCC (QCCN) - same |
| Brand | Analog Devices | Analog Devices - same | Analog Devices - same | Analog Devices - same | Analog Devices - same | Maxim Integrated - cross-brand | Maxim Integrated - cross-brand |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Architecture | SAR | SAR | SAR | SAR | SAR | SAR | SAR |
| Temperature Grade | Commercial (0 C to +70 C) | Commercial | Industrial (KE suffix) | Commercial (JW suffix) | Military/883B (SE suffix) | Industrial | Commercial (KCWI suffix) |
| Internal Reference | Yes (buried-Zener) | Yes | Yes | Yes | Yes | Yes | Yes |
| Bus Interface | 8-/16-bit parallel, three-state | 8-/16-bit parallel | 8-/16-bit parallel | 8-/16-bit parallel | 8-/16-bit parallel | Parallel | Parallel |
تفاوت‌های کلیدی
- Fully integrated reference and clock (در مقابلDiscrete ADC + external reference designs)
- Direct 8- and 16-bit microprocessor bus interface (در مقابلSerial-output ADCs like MAX187CEWE)
- Pin-selectable unipolar and bipolar input ranges (در مقابلSingle-range ADCs like MAX153EAP)
یادداشت‌های طراحی
Use a solid ground plane split between analog ground (AGND, pin 15) and digital ground (DGND, pin 2), joined at a single point near the ADC. Route analog input traces away from digital bus lines and clock signals; the AD574A's 35 us conversion time does not excuse sloppy layout, because reference noise couples directly into the conversion result through the buried-Zener node. Place the optional input filter capacitor as close to pin 13 (ANALOG IN) as possible to limit high-frequency noise folding into the baseband.
The AD574AJE requires a clean +5 V digital supply on VCC/VLOGIC (pins 1, 6, 26) and +/-15 V analog supplies on VEE (-15 V, pin 25). Decouple each supply pin with 0.1 uF ceramic and 10 uF tantalum capacitors placed within 5 mm of the IC. Because the ADC draws dynamic current during conversion, use a star-ground topology or dedicated analog regulator; sharing the +5 V supply with a switching converter or noisy logic can introduce reference jitter visible as code-edge noise on the LSB.
Do not leave the 12/8 bus-width select pin (pin 24) floating - tie it to VCC for 12-bit operation or to DGND for two 8-bit reads. Avoid driving the three-state data bus with external logic during conversion; let only the ADC drive these lines between the start of conversion and the read cycle. The bipolar offset adjust (pin 16) requires a 50 kohm potentiometer for +/-5 V or +/-10 V ranges; do not skip this adjustment if bipolar accuracy is required. Finally, verify the analog input range strapping (R1-R10 pins) against the desired full-scale before calibration.
اطلاعات انطباق
Ceramic LCC parts with JE suffix are often supplied with SnPb terminal plating; request the RoPb-rated option from Analog Devices for lead-free assembly. RoHS/REACH/AEC-Q100 status not confirmed in the verified distributor data - contact Analog Devices for the latest compliance documentation.
