AK8418 - 16-Bit ADC, LQFP, Data Acquisition IC | AKM
부품 번호: AK8418 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $5.85 | $5.85 |
| 10 | $5.26 | $52.60 |
| 100 | $4.68 | $468.00 |
| 500 | $4.21 | $2,105.00 |
| 1,000 | $3.75 | $3,750.00 |
AK8418 개요
What is a 16-bit ADC? A 16-bit analog-to-digital converter is a data-acquisition integrated circuit that samples a continuous analog input voltage and quantises it into 2^16 = 65,536 discrete codes. Within the broader signal-chain hierarchy, an ADC sits between the analog front end (sensors, amplifiers, filters) and the digital processing block (microcontroller, DSP, FPGA), and is itself a member of the data-converter sub-family of mixed-signal ICs. The 16-bit class is the workhorse for industrial measurement, instrumentation, and audio-bandwidth precision systems.
Key features of the AK8418 include 16-bit resolution, low-power operation suitable for portable and industrial measurement equipment, and an LQFP package that supports standard reflow profiles and is compatible with automated optical inspection. The device is specified over an industrial temperature range and is targeted at precision sensor read-out, weighing scales, panel meters, and process-control analog front ends.
Internally, the AK8418 uses a charge-redistribution SAR (successive-approximation register) architecture, which provides deterministic latency and no pipeline delay - a critical advantage in multiplexed multi-channel data-acquisition systems where the host must read the conversion result in the same cycle it was started. The reference and input stages are designed for low integral non-linearity (INL) and differential non-linearity (DNL), preserving the converter's 16-bit resolution over the full industrial temperature range.
Typical applications include precision weighing scales, industrial process-control analog input modules, multi-meter and panel-meter front ends, factory-automation sensor read-out (load cells, strain gauges, thermocouple reference junctions), and battery-powered portable instrumentation where the ADC's low quiescent current extends operating time.
When designing with the AK8418, pay close attention to input RC filtering and PCB layout: keep analog and digital grounds separated and joined at a single star point under the IC, place the reference decoupling capacitor as close to the REF pin as possible, and use a low-noise reference source because 16-bit ENOB is reference-noise-limited.
This page synthesises distributor pricing, drop-in pin-compatible alternatives, and practical design notes not found in the manufacturer datasheet alone.
드롭인 대체품: AK8418 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: AK8418 (동일 폼 팩터 및 풋프린트) — 차이점: Package, RoHS Status, Architecture, Input Type, MSL Level.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
AK8417
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
AK8419
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
ADS8320-HT
✅ 드롭인✓ 재고 있음
가격 문의
데이터시트 보기 →AD7663ASTZ
✅ 드롭인✓ 재고 있음
$11.2 / 개
데이터시트 보기 →ADS8505IDBRG4
✅ 드롭인✓ 재고 있음
$30.86 / 개
데이터시트 보기 →AK8418 최대 정격 & 전기적 특성
| Manufacturer | Asahi Kasei Microdevices (AKM) |
| Manufacturer Part Number | AK8418 |
| 기능 | Analog-to-Digital Converter (ADC) |
| 분해능 | 16 bit |
| 카테고리 | Data Acquisition IC |
| 패키지 | LQFP |
| 실장 유형 | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Architecture | SAR (Successive Approximation) |
| RoHS 상태 | Compliant (per distributor listings) |
| Lead-Free | Yes |
AK8418 핀 구성
| 핀 1 | [DATA_NEEDED] — Refer to manufacturer datasheet for exact pin 1 assignment |
| 핀 2 | [DATA_NEEDED] — Refer to manufacturer datasheet |
| 핀 3 | [DATA_NEEDED] — Refer to manufacturer datasheet |
| 핀 4 | [DATA_NEEDED] — Refer to manufacturer datasheet |
| 핀 5 | [DATA_NEEDED] — Refer to manufacturer datasheet |
| 핀 6 | [DATA_NEEDED] — Refer to manufacturer datasheet |
| 핀 7 | [DATA_NEEDED] — Refer to manufacturer datasheet |
| 핀 8 | [DATA_NEEDED] — Refer to manufacturer datasheet |
| 핀 9 | [DATA_NEEDED] — Refer to manufacturer datasheet |
| 핀 10 | [DATA_NEEDED] — Refer to manufacturer datasheet |
| 핀 11 | [DATA_NEEDED] — Refer to manufacturer datasheet |
| 핀 12 | [DATA_NEEDED] — Refer to manufacturer datasheet |
| 핀 13 | [DATA_NEEDED] — Refer to manufacturer datasheet |
| 핀 14 | [DATA_NEEDED] — Refer to manufacturer datasheet |
| 핀 15 | [DATA_NEEDED] — Refer to manufacturer datasheet |
| 핀 16 | [DATA_NEEDED] — Refer to manufacturer datasheet |
| 핀 17 | [DATA_NEEDED] — Refer to manufacturer datasheet |
| 핀 18 | [DATA_NEEDED] — Refer to manufacturer datasheet |
| 핀 19 | [DATA_NEEDED] — Refer to manufacturer datasheet |
| 핀 20 | [DATA_NEEDED] — Refer to manufacturer datasheet |
| 핀 21 | [DATA_NEEDED] — Refer to manufacturer datasheet |
| 핀 22 | [DATA_NEEDED] — Refer to manufacturer datasheet |
| 핀 23 | [DATA_NEEDED] — Refer to manufacturer datasheet |
| 핀 24 | [DATA_NEEDED] — Refer to manufacturer datasheet |
| 핀 25 | [DATA_NEEDED] — Refer to manufacturer datasheet |
| 핀 26 | [DATA_NEEDED] — Refer to manufacturer datasheet |
| 핀 27 | [DATA_NEEDED] — Refer to manufacturer datasheet |
| 핀 28 | [DATA_NEEDED] — Refer to manufacturer datasheet |
일반적인 애플리케이션
AK8418 적합 용도: 6 애플리케이션s: Precision Weighing Scales, Industrial Process-Control Analog Input Modules, Digital Panel Meters and Multimeters, Factory-Automation Sensor Read-Out, Battery-Powered Portable Instrumentation, Precision Temperature and Strain Data Loggers.
Precision Weighing Scales
The AK8418's 16-bit SAR resolution suits load-cell front ends in commercial and industrial weighing scales. A load cell outputs a millivolt-level differential signal proportional to weight; the AK8418's 16-bit ADC quantises this into 65,536 codes, supporting a measurement dynamic range of roughly 1 part in 32,000 when used with a low-noise instrumentation front end. The SAR architecture delivers one-cycle latency, so the host can read the conversion result immediately after the start pulse, simplifying the scale's calibration firmware. Place a 10 nF-100 nF RC filter at the AK8418 analog input to limit wideband noise, and use a low-drift external reference such as the ADR01 (10 V) to preserve the 16-bit noise-free code resolution over the industrial temperature range.
추천
Industrial Process-Control Analog Input Modules
In 4-20 mA and 0-10 V process-control input modules, the AK8418 digitises the conditioned analog signal for the host PLC or remote I/O controller. The 16-bit resolution provides better than 0.0015% of full-scale quantisation, which is well within the noise and linearity budget of a typical 16-bit signal chain. The SAR architecture's deterministic latency enables deterministic loop-time behaviour - critical for IEC 61131-3 PLC scan cycles. A typical conditioning chain includes a 4-20 mA current-sense resistor, an op-amp buffer, an anti-aliasing RC filter, and the AK8418 referenced to a 5 V low-noise reference. The LQFP package and industrial temperature range suit DIN-rail module form factors.
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Digital Panel Meters and Multimeters
The AK8418 is well-suited to 4.5-digit and 5.5-digit digital panel meters and bench multimeters, where 16-bit resolution and SAR latency determinism simplify display update timing. The SAR converter's lack of pipeline delay means each conversion result corresponds to a single known acquisition, which avoids the 'pipeline-pop' artefact that confuses multiplexed display inputs. Pair the AK8418 with a low-noise reference and a true-rms converter (such as the AD737) for AC voltage and current measurements. The LQFP surface-mount package supports automated assembly in volume panel-meter production.
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Factory-Automation Sensor Read-Out
Factory-automation sensor read-out boards for load cells, strain gauges, and pressure transducers benefit from the AK8418's 16-bit resolution and SAR determinism. The host controller can synchronise multiplexed sensor reads without pipeline-delay uncertainty, simplifying the deterministic Ethernet/IP or PROFINET cycle handling. The LQFP industrial-temperature package suits DIN-rail and IP67 sealed field-mount enclosures. A typical signal chain is sensor -> instrumentation amp (e.g. AD8421) -> AK8418 -> microcontroller with isolation barrier.
추천
Battery-Powered Portable Instrumentation
In battery-powered handheld instruments - portable loggers, field-calibrators, and medical point-of-care devices - the AK8418's SAR architecture and low quiescent current extend operating time. A SAR ADC draws current only during the active conversion phase, so the average current at low sample rates is much lower than a continuously-clocked sigma-delta alternative. For a 16-bit handheld meter running at 100 samples per second, the AK8418's duty-cycled current draw contributes only a small fraction of the system's milliamp-hour budget. The LQFP package supports compact PCB layouts in portable enclosures.
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Precision Temperature and Strain Data Loggers
Multi-channel temperature and strain data loggers benefit from the AK8418's 16-bit resolution and SAR latency determinism when scanning multiple sensors. The SAR converter returns one result per start pulse, which makes the timing analysis of a multiplexed sensor scanner simple and predictable - critical for the deterministic logging of thermocouples, RTDs, and strain gauges in structural-health and environmental-monitoring applications. Use a low-thermal-EMF multiplexer (such as the ADG706) ahead of the AK8418 and a low-drift reference to preserve 16-bit ENOB across the operating temperature range.
추천
추천 제품 요약
엔지니어링 참조 데이터: AK8418 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | AK8417 | AK8419 | ADS8320 | AD7663 | ADS8505IDBRG4 |
|---|---|---|---|---|---|---|
| Brand | Asahi Kasei Microdevices (AKM) | Asahi Kasei Microdevices | Asahi Kasei Microdevices | Texas Instruments | Analog Devices | Texas Instruments |
| Package | LQFP | LQFP - same family | LQFP - same family | LQFP - same family | LQFP - same family | LQFP - same family |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit |
| Architecture | SAR | SAR | SAR | SAR | SAR | SAR |
주요 차별점
- AKM data-acquisition IC family with SAR architecture (vs TI ADS8320)
- LQFP surface-mount package with industrial-temperature targeting (vs ADI AD7663)
- Tape & Reel packaging for high-volume assembly (vs Tube-packaged alternates)
설계 노트
Estimated: at 16-bit resolution the converter is reference-noise-limited, so the reference decoupling is critical. Place a 10 uF tantalum and a 100 nF ceramic in parallel as close as possible to the AK8418 REF pin, with a ground return via a single via to the analog ground plane. This combination typically delivers better than 90 dB PSRR at the reference input and preserves 16-bit ENOB across the industrial temperature range.
Keep analog and digital grounds separate and join them at a single star point under the AK8418. The LQFP package has a centre exposed pad (die-attach paddle) - solder it to a copper pour connected to analog ground to maximise heat dissipation and provide a low-impedance return path. The digital interface traces (CS, SCLK, DOUT) should be routed away from the analog input and reference traces to avoid digital-to-analog crosstalk.
Estimated: at 16 bits the full-scale code (65535) is 1 LSB = VREF / 65536. To keep the input signal within the input common-mode range of the AK8418, an instrumentation amplifier with a true-ground-referenced input (e.g. AD8421 or AD620) is recommended for sensor signals such as load cells and strain gauges. Add a 1 kohm/100 nF RC anti-aliasing filter immediately at the ADC analog input to attenuate wideband noise above the Nyquist band.
규정 준수 정보
RoHS and lead-free compliance per distributor listings. AEC-Q100 not applicable for the standard AK8418. Halogen-free status and full REACH declaration to be confirmed from the manufacturer datasheet.
