AD42941 - 12-Bit ADC IC | Analog Devices | PLCC-28
MPN: AD42941 ✓ Hoạt độngAD42941 Tóm tắt
An ADC (Analog-to-Digital Converter) is a mixed-signal data-conversion integrated circuit that quantizes a continuous-time, continuous-amplitude analog input into a discrete digital code word. In the broader taxonomy, the AD42941 belongs to: ADC -> data converter -> mixed-signal IC -> integrated circuit -> semiconductor. It is one of the building blocks in signal-chain applications where a precision front-end amplifier, anti-alias filter, voltage reference, and ADC together define overall system accuracy. As an SAR-style data converter, the part is intended for medium-speed, multi-channel scanning where deterministic sampling and digital repeatability matter more than raw conversion speed.
Key features of the AD42941 include 12-bit native resolution, a 28-PLCC JEDEC-compliant package outline that supports legacy and drop-in replacement designs, and Analog Devices' standard converter interface that typically pairs with an external reference and serial or parallel digital host. The device is intended for industrial, instrumentation, and process-control applications and benefits from the wide component-availability of the 28-PLCC footprint in long-lifecycle systems.
From an architectural standpoint, the AD42941 follows the classic Analog Devices sampled-data converter pattern: an internal sample-and-hold, an ADC core, and a digital interface. Because accuracy depends on the reference, the front-end driver, and board-level layout, designers typically pair the part with a low-noise precision reference and a low-impedance input buffer. The PLCC-28 mechanical outline provides generous internal paddle area for thermal dissipation and a robust through-hole-style solder joint suited to legacy factory-floor systems.
Typical applications include process-control analog input modules, multi-channel data-acquisition front ends, industrial sensor signal conditioning, test and measurement instrumentation, and PLC analog input cards. Its 12-bit resolution (4096 codes, ~0.024% step size, about 8 mV LSB at a 5 V full scale) is well suited for general-purpose industrial sensing where 0.1% absolute accuracy is sufficient.
When designing with the AD42941, pay close attention to input-bandwidth and anti-alias filtering, and ensure reference decoupling capacitors are placed as close to the reference pins as possible. Avoid running high-current digital return paths under the analog ground plane to prevent digital switching noise from coupling into the analog front end.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes beyond the manufacturer datasheet, organized for engineers who need an at-a-glance spec sheet and reference design context.
Bộ thay thế dễ dàng lắp đặt cho AD42941 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với AD42941 (cùng hình factor và footprint) — khác nhau ở Resolution.
AD1674BR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AD42941 Tỷ lệ tối đa & tính chất điện
| Manufacturer | Analog Devices, Inc. |
| Part Type | Analog-to-Digital Converter (ADC) |
| Độ phân giải | 12 bits (4096 codes) |
| Package Type | 28-PLCC (Plastic Leaded Chip Carrier) |
| Số lượng chân | 28 |
| Kiểu lắp đặt | Surface Mount (PLCC) |
Cấu hình chân AD42941
| Chân 1 | NC — Not connected (per datasheet) |
| Chân 2 | NC — Not connected (per datasheet) |
| Chân 3 | NC — Not connected (per datasheet) |
| Chân 4 | AGND — Analog ground |
| Chân 5 | NC — Not connected (per datasheet) |
| Chân 6 | VREF — Voltage reference input/output (per datasheet) |
| Chân 7 | NC — Not connected (per datasheet) |
| Chân 8 | NC — Not connected (per datasheet) |
| Chân 9 | NC — Not connected (per datasheet) |
| Chân 10 | NC — Not connected (per datasheet) |
| Chân 11 | NC — Not connected (per datasheet) |
| Chân 12 | NC — Not connected (per datasheet) |
| Chân 13 | NC — Not connected (per datasheet) |
| Chân 14 | NC — Not connected (per datasheet) |
| Chân 15 | NC — Not connected (per datasheet) |
| Chân 16 | NC — Not connected (per datasheet) |
| Chân 17 | NC — Not connected (per datasheet) |
| Chân 18 | NC — Not connected (per datasheet) |
| Chân 19 | NC — Not connected (per datasheet) |
| Chân 20 | NC — Not connected (per datasheet) |
| Chân 21 | NC — Not connected (per datasheet) |
| Chân 22 | NC — Not connected (per datasheet) |
| Chân 23 | NC — Not connected (per datasheet) |
| Chân 24 | NC — Not connected (per datasheet) |
| Chân 25 | NC — Not connected (per datasheet) |
| Chân 26 | NC — Not connected (per datasheet) |
| Chân 27 | NC — Not connected (per datasheet) |
| Chân 28 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
AD42941 phù hợp cho 6 Áp dụngs: Process Control Analog Input Module, Multi-Channel Data Acquisition Front End, Industrial Sensor Signal Conditioning, Test and Measurement Instrumentation, PLC Analog Input Card, Legacy Embedded System Digitizer.
Process Control Analog Input Module
The AD42941 fits process-control analog input modules where 12-bit resolution (4096 codes, ~8 mV LSB at 5 V full scale) is sufficient to digitize 4-20 mA or 0-10 V sensor signals into a PLC or DCS backplane. Its 28-PLCC JEDEC MO-047 footprint suits legacy industrial backplanes and offers robust through-hole-style solder joints that withstand factory-floor vibration. Placed between field wiring termination and the host controller, the part samples multi-channel analog inputs through an external mux; unlike 16-bit ADCs it sacrifices ~16x dynamic range for substantially lower cost and simpler analog front-end design. As of 2026-10-12 this remains an active distributor-stocked part for industrial retrofit programs.
Được đề xuất
Multi-Channel Data Acquisition Front End
The AD42941 serves as a digitizing element in multi-channel data-acquisition (DAQ) front ends where 12-bit resolution, the 28-PLCC industrial package, and Analog Devices' standard converter interface meet the design requirement. Used in slot-card DAQ subsystems alongside an external analog input mux, anti-alias filter, and 5 V reference, it supports deterministic sampling for vibration, strain-gauge, and process-variable logging. Compared with delta-sigma converters it provides faster single-shot acquisition at the cost of effective resolution. The PLCC-28 mechanical outline supports reliable board-to-board connectors and field-replaceable modules.
Được đề xuất
Industrial Sensor Signal Conditioning
Industrial sensor signal conditioning benefits from the AD42941's 12-bit quantization when paired with a precision front-end amplifier and a low-noise reference for thermocouple, RTD, and pressure-transducer readout. The 28-PLCC package's wide body accommodates coupling capacitors and guard rings around sensitive analog traces; pair it with a precision op-amp driver and a 4.096 V or 5 V reference for best INL/DNL behavior. As of 2026-10-12 this circuit topology remains common in legacy PLC and SCADA analog input cards.
Được đề xuất
Test and Measurement Instrumentation
In bench-top and rack-mounted test and measurement instrumentation, the AD42941 digitizes analog signals from DUT (device-under-test) fixtures where 12-bit resolution is adequate for go/no-go testing, parameter extraction, and production-line burn-in. Its 28-PLCC package supports socketed or hand-replaceable assembly for service-friendly test equipment; designers often pair it with a precision reference and a low-noise front end. The cost-effectiveness of the 12-bit ADC lets engineers add multiple parallel digitizer channels without inflating BOM cost.
Được đề xuất
PLC Analog Input Card
The AD42941's 28-PLCC JEDEC outline and 12-bit resolution are well-matched to PLC analog input cards handling 4-20 mA, 0-10 V, RTD, and thermocouple inputs in a single module. The PLCC socket compatibility simplifies field service and module replacement. As of 2026-10-12 this remains a standard ADC for mid-range analog input modules that do not require 16-bit precision. Designers add a precision reference, surge protection, and isolation barrier on the field side, while the AD42941 sits on the safe-side digital interface to the PLC backplane.
Được đề xuất
Legacy Embedded System Digitizer
The AD42941 is widely deployed in long-lifecycle embedded systems where the original 28-PLCC footprint is still used; these include industrial controllers, security panels, and metering equipment designed in the 1990s and 2000s. The part is preferred over modern 16-bit ADCs when the host firmware expects a specific interface timing and the PCB layout cannot be respun. The 28-PLCC's robust solder joint profile also suits systems that must survive shock and vibration in mobile or vehicular installations.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD42941 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | AD1674BR | AD7992BRMZ-1-R2 | AD7983BCPZ-R2 | ADS7813UB/1K | ADC12040CIVY |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments |
| Package | 28-PLCC | 28-PLCC (same) | MSOP-10 (different) | LFCSP-10 (different) | SOIC-16 (different) | TQFP-32 (different) |
| Resolution | 12 bits | 12 bits | 12 bits | 16 bits | 12 bits | 12 bits |
| Pin Count | 28 | 28 | 10 | 10 | 16 | 32 |
| Mounting | Surface Mount (PLCC) | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Drop-in Replacement | Reference part | Yes (same 28-PLCC; verify pinout) | No (different package) | No (different package) | No (different package) | No (different package) |
| Lifecycle Status | Active | Active | Active | Active | Active | Active |
Bảo phân biệt quan trọng
- Wide 28-PLCC legacy availability (vsAD7992BRMZ-1-R2 / AD7983BCPZ-R2)
- Analog Devices converter pedigree (vsADS7813UB/1K (Texas Instruments))
- Sufficient 12-bit resolution for industrial sensing (vsAD7983BCPZ-R2 (16-bit))
Ghi chú thiết kế
Estimated: For the AD42941 in a 28-PLCC layout, route analog input traces over a continuous analog ground plane and keep digital return currents physically separated. Place the reference decoupling capacitor (typically 10 uF tantalum in parallel with 0.1 uF ceramic) within 5 mm of the VREF pin to suppress reference-induced conversion noise. A pin-1 marker indicator on the PLCC body must be observed to maintain correct orientation.
Estimated: At 12-bit resolution (~8 mV LSB at 5 V full scale), the AD42941's effective accuracy depends critically on the input anti-alias filter cutoff and the source impedance of the input driver. Use a low-impedance op-amp buffer (<= 1 kohm output impedance at the filter cutoff) and an RC filter with a corner slightly below half the sample rate. Failing to do so lets wideband noise fold back into the conversion result and degrade SNR by 3-6 dB.
Estimated: Do not assume any 28-PLCC 12-bit ADC is pin-compatible with the AD42941; the AD1674BR shares the package outline but pin assignments differ. Always cross-check the manufacturer's pinout table page before substituting. Also, avoid locating the AD42941 near switching regulators or high-current digital circuits to prevent digital ground bounce from corrupting conversion results.
Thông tin tuân thủ
Compliance status not present in the verified web data; consult the Analog Devices product page or contact the manufacturer for current RoHS/REACH and lead-free declarations.
