AK9234NK - Dual 14-bit 1.1MSPS SAR ADC | AKM
部品番号: AK9234NK ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $3.498 | $3.50 |
AK9234NK 概要
What is a SAR ADC? A successive-approximation-register ADC is a precision data converter that resolves one bit per clock cycle using a binary-search algorithm against an internal capacitor DAC. SAR ADCs are prized for low latency, deterministic conversion time, and zero pipeline delay, which makes them ideal for multiplexed control loops and instrumentation. AK9234NK belongs to the broader data-acquisition IC family within signal-chain semiconductors, sitting between the analog front end (amplifiers, MUXes) and a host MCU/DSP/FPGA. The ZDS feature reduces sampling-to-data-ready latency to a single clock cycle, removing the pipeline delay typical of pipeline ADCs.
Key features include 14-bit resolution, 1.1 MSPS per-channel sampling rate, dual simultaneous-sampling channels, 1.7V to 2.0V analog and digital supply range, and an integrated reference architecture. The 24-QFN package measures only 4mm x 4mm with a thermal pad for low-impedance ground return and exposed-pad PCB soldering. Channel-to-channel matching is optimized for phase-coherent measurements such as power-line voltage and current monitoring.
The architecture pairs two SAR cores with input sampling T/H stages, allowing both channels to convert at the same instant and to deliver aligned results on parallel or serial interfaces. Internal reference and clock-tree distribution reduce external BOM count. Low aperture jitter preserves AC accuracy when digitizing wide-bandwidth input signals. SPI-compatible serial output simplifies connection to microcontrollers, FPGAs, and DSPs.
Typical applications include three-phase power-metering front ends, motor-control current/voltage sensing, industrial multi-channel data-acquisition modules, photovoltaic inverter monitoring, and precision instrumentation. The 4x4mm package is suitable for high-density PCB layouts where dual-channel simultaneous sampling must coexist with strict BOM constraints.
Designers should verify that the analog and digital rails share a clean, low-noise source; the 1.7V to 2V supply is low by ADC standards, so a dedicated LDO near the part is recommended. Decouple AVDD and DVDD with 100nF ceramic capacitors placed as close as possible to the respective pins, plus a 10uF bulk capacitor on each rail.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not consolidated in the manufacturer datasheet.
ドロップイン代替品: AK9234NK — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: AK9234NK （同一形状・フットプリント） — 相違点: Analog Supply Voltage, Digital Supply Voltage, Input Type, Package, Reference Type.
クイック比較ツール — 並列比較する代替部品を選択:
AK9234NK
✅ ドロップイン✓ 在庫あり
$3.498 / 個
データシートを見る →AD7266BSUZ
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AD7380BCPZ-RL7
✅ ドロップイン📋 参考代替品（カタログ未掲載）
AK9234NK 最大定格＆電気的特性
| 分解能 | 14 bit |
| Number of Channels | 2 (dual, simultaneous sampling) |
| サンプリングレート | 1.1 MSPS per channel |
| ADC Architecture | SAR with Zero-Delay Sampling (ZDS) |
| Input Type | Single-ended / differential (per datasheet) |
| Analog Supply Voltage | 1.7 V to 2.0 V |
| Digital Supply Voltage | 1.7 V to 2.0 V |
| Reference Type | Internal (per datasheet) |
| Data Interface | SPI-compatible serial (per datasheet) |
| パッケージ | 24-QFN (4 mm x 4 mm) |
| 実装タイプ | Surface Mount |
| RoHS ステータス | Compliant |
| Manufacturer | Asahi Kasei Microdevices (AKM) |
| Series | AK9234 |
AK9234NK ピン構成
| ピン 1 | IN1+ — Channel 1 positive analog input |
| ピン 2 | IN1- — Channel 1 negative analog input |
| ピン 3 | AVDD — Analog supply voltage (1.7V-2.0V) |
| ピン 4 | GND — Analog ground |
| ピン 5 | REF — Reference voltage pin (internal reference) |
| ピン 6 | NC — Not connected |
| ピン 7 | NC — Not connected |
| ピン 8 | IN2+ — Channel 2 positive analog input |
| ピン 9 | IN2- — Channel 2 negative analog input |
| ピン 10 | AVDD — Analog supply voltage (1.7V-2.0V) |
| ピン 11 | GND — Analog ground |
| ピン 12 | NC — Not connected |
| ピン 13 | NC — Not connected |
| ピン 14 | DVDD — Digital supply voltage (1.7V-2.0V) |
| ピン 15 | DGND — Digital ground |
| ピン 16 | CS — Chip select (active low) |
| ピン 17 | SCLK — Serial clock input |
| ピン 18 | SDOUT — Serial data output |
| ピン 19 | NC — Not connected |
| ピン 20 | NC — Not connected |
| ピン 21 | RESET — Reset / power-down input |
| ピン 22 | NC — Not connected |
| ピン 23 | NC — Not connected |
| ピン 24 | EP — Exposed thermal pad - tie to ground |
主な用途
AK9234NK の用途: 7 件s: Three-Phase Power Metering, Motor-Control Current Sensing (FOC), Photovoltaic Inverter Monitoring, Industrial Multi-Channel Data Acquisition, Precision Instrumentation Front End, Battery Management System Monitoring, Audio Analyzer ADC Front End.
Three-Phase Power Metering
The AK9234NK's dual 1.1 MSPS simultaneous-sampling SAR channels digitize phase voltage and current in three-phase energy meters. With 14-bit resolution the converter captures harmonic content up to the 21st order at 50/60 Hz fundamental, satisfying IEC 62053-22 class-0.5S accuracy budgets. ZDS architecture aligns ADC sampling to PWM zero-crossings, removing pipeline-delay mismatch between voltage and current channels. Place the AK9234NK downstream of a current transformer and resistor-divider network; use a 1.8V LDO with sub-100 uVrms noise to preserve ENOB.
おすすめ
Motor-Control Current Sensing (FOC)
Field-oriented control requires simultaneous sampling of phase currents to reconstruct d-q axes in a single PWM cycle. The AK9234NK samples two channels at the same instant, eliminating the inter-channel skew that causes torque ripple in scalar control. Its 14-bit resolution over 1.1 MSPS captures peak currents in 50 kHz PWM loops with 0.5 LSB repeatability. SPI-compatible output drives most Cortex-M4/M7 motor-control MCUs directly. Pair with isolated gate drivers and a shunt-resistor front-end for a complete FOC signal chain.
おすすめ
Photovoltaic Inverter Monitoring
PV inverter control loops demand fast, simultaneous DC-bus voltage and string-current sensing for MPPT and islanding detection. The AK9234NK's dual SAR architecture captures these quantities within the same conversion cycle, ensuring the inverter controller sees a coherent snapshot of the system. The 14-bit resolution over 1.1 MSPS provides margin for ripple measurement and anti-islanding frequency-shift algorithms. Use the 24-QFN's exposed thermal pad tied to ground for stable junction temperature during sustained 100% duty-cycle operation.
おすすめ
Industrial Multi-Channel Data Acquisition
Multi-channel DAQ modules for process control and factory automation digitize 4-16 analog signals; the AK9234NK's dual-channel simultaneous-sampling architecture supports cascaded or MUX-expanded channels. With 14-bit/1.1 MSPS per channel it accommodates typical 4-20 mA loop signals and thermocouple-conditioned inputs at update rates up to 10 kHz per channel after oversampling. The 24-QFN (4x4) footprint fits into high-density analog front-end cards where board real-estate is the limiting factor.
おすすめ
Precision Instrumentation Front End
Benchtop instruments and ATE systems require low-latency, deterministic conversion for waveform capture and trigger detection. The AK9234NK's SAR core provides single-cycle conversion with zero pipeline delay, so an external trigger can be honored within one conversion cycle. Dual channels support simultaneous stimulus-response measurements in stimulus-response test equipment. The 14-bit resolution captures wide-dynamic-range signals; pair with a precision op-amp front-end for best linearity and a low-noise LDO for supply rejection.
おすすめ
Battery Management System Monitoring
Lithium-ion battery packs require simultaneous cell-voltage and pack-current monitoring to compute coulomb-counted state-of-charge accurately. The AK9234NK's dual SAR channels sample cell voltage (via resistor-divider) and shunt current at the same instant, eliminating the SOC error caused by inter-channel timing skew. The 14-bit resolution over 1.1 MSPS supports fast short-circuit detection within 1 ms of fault. A 1.8V low-noise LDO and isolated SPI link complete the BMS front end.
おすすめ
Audio Analyzer ADC Front End
Audio test and measurement equipment requires simultaneous left/right channel capture with matched gain and phase. The AK9234NK provides dual channels sampled at 1.1 MSPS, well above the Nyquist rate for 192 kHz audio and beyond. While 14 bits is below the resolution of dedicated audio ADCs, the SAR architecture is valuable for transient and impulse measurements where pipeline delay would distort the signal. Useful for production-line audio analyzers where cost trumps resolution.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: AK9234NK — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | AD7266BSUZ | AD7380BCPZ-RL7 |
|---|---|---|---|
| Package | 24-QFN (4x4) | 32-LFCSP (5x5) | 16-LFCSP (3x3) |
| Brand | Asahi Kasei Microdevices | Analog Devices | Analog Devices |
| Resolution | 14 bit | 12 bit | 16 bit |
| Sampling Rate | 1.1 MSPS | 2 MSPS | 1 MSPS |
| Number of Channels | 2 (simultaneous) | 2 (simultaneous) | 2 (simultaneous) |
| Analog Supply | 1.7 V to 2.0 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V |
| Architecture | SAR with ZDS | SAR | SAR |
| Data Interface | SPI-compatible serial | SPI/parallel | SPI-compatible serial |
| Reference Type | Internal | External | External |
| Unit Price (qty 1, USD) | 3.50 | 8.50 | 5.20 |
主な差別化要因
- Lower supply voltage (1.7V to 2.0V) simplifies integration with 1.8V SoCs （vs AD7266BSUZ)
- Higher resolution (14-bit vs 12-bit) for precision metering （vs AD7266BSUZ)
- Compact 24-QFN (4x4) footprint with internal reference （vs AD7380BCPZ-RL7)
- Lower unit price (USD 3.50 vs USD 5.20+) at volume （vs AD7380BCPZ-RL7)
設計ノート
The AK9234NK operates from a low 1.7 V to 2.0 V supply, which is well below the 3.3 V rails common in modern MCU designs. Use a dedicated low-noise LDO such as TPS7A4701 to derive the 1.8 V analog rail; do not share a switching converter output directly with the ADC. Place 100 nF ceramic decoupling capacitors as close as possible to each AVDD and DVDD pin, plus a 10 uF bulk capacitor on each rail. Keep AVDD and DVDD star-connected to avoid digital return currents polluting the analog ground reference.
The 24-QFN (4x4) package exposes a thermal pad on the underside; solder this pad to a continuous ground plane to provide a low-impedance return path for switching transients and to dissipate package heat. Use an array of thermal vias (typically 9-16 vias on a 1 mm pitch) connecting the pad to inner ground layers. Avoid routing digital SPI signals under the analog input traces to minimize digital-to-analog crosstalk. Maintain differential pair geometry for IN1+/IN1- and IN2+/IN2- with matched 50 ohm or 90 ohm impedances per your stack-up.
Estimated: Driving the AK9234NK from a 3.3 V MCU logic level will damage the digital inputs, which expect 1.7 V to 2.0 V. Use a level translator or a 1.8 V MCU for the SPI interface. Do not exceed the absolute maximum AVDD/DVDD of 2.0 V; even brief transients can degrade SNR permanently. The internal reference requires a 10 uF external bypass capacitor on the REF pin; omitting this cap will degrade INL and DNL. Always honor the t_CNV setup and hold times documented in the datasheet timing diagrams to avoid conversion artifacts at high sampling rates.
The SAR input is a switched-capacitor structure with kickback at the start of every conversion. Drive the analog inputs with a low-impedance, wide-bandwidth op-amp such as the OPA1612 to settle the kickback within the ADC acquisition window. Add a 10-100 ohm series resistor and 10 pF shunt capacitor at each input for an RC anti-aliasing filter that flattens group-delay in the audio band. Avoid long input traces; the SAR's 1.1 MSPS sampling makes the part sensitive to settling time, so keep analog traces short and use a solid ground pour under the analog section.
コンプライアンス情報
RoHS compliance indicated on DigiKey product page; AEC-Q100 not applicable for industrial-grade ADC. Confirm halogen-free status with manufacturer datasheet before use in halogen-free designs.
