AK8442AVQ - 16-bit 35 MSPS/ch 3-ch Video ADC | AKM
MPN： AK8442AVQ ✓ 啟用中AK8442AVQ 概覽
An analog-to-digital converter is a mixed-signal integrated circuit that converts continuous analog voltages into discrete digital codes at a specified sampling rate. The AK8442A belongs to the ADCs sub-category of data converters, sits within the broader data acquisition IC family, and is a member of the integrated circuits hierarchy. Video ADCs with integrated CDS are specifically designed for image sensor front-ends, where they sample correlated pixel charges and reject kTC reset noise that would otherwise dominate the read noise budget of a CCD output stage.
Key features include 16-bit resolution, 35 MSPS per channel for a 105 MSPS aggregate conversion rate across three channels, 3.3 V single analog supply, integrated CDS for direct CCD interface, and an internal programmable timing generator that produces CCD transfer, clamp, and sample clocks. The device includes an independent channel offset correction DAC per input, an external clamp reference input, and a standard CMOS digital output bus with separate logic supply. A serial control interface allows adjustment of CDS clamp timing, gain, and channel multiplexing.
Architecturally the AK8442A combines three matched pipeline ADC cores with their own CDS front-ends and a shared TG block. Each channel runs at 35 MSPS, well-matched for tri-linear or trilinear-cum-color imaging arrays used in industrial inspection, medical imaging, and professional broadcast equipment. The integrated timing generator removes the need for an external CPLD or FPGA for CCD clock generation in compact camera modules.
Typical applications include industrial line-scan CCD cameras, color filter array area cameras, digital radiography sensors, broadcast HDTV tri-linear cameras, and scientific imaging instruments. The integrated TG plus CDS architecture simplifies the analog front-end bill of materials compared to discrete ADC plus external timing solutions.
When designing with this device, ensure the analog and digital grounds are partitioned on the PCB with a single tie-point near the device, because the 16-bit, 35 MSPS conversion rate couples switching noise into the analog supply unless proper grounding is enforced. Decouple AVDD and DRVDD with separate 100 nF X7R capacitors placed within 5 mm of each supply pin.
This page synthesizes distributor pricing, CCD-front-end design notes, and cross-reference candidates not aggregated on the manufacturer datasheet, providing practical guidance for engineers integrating the AK8442AVQ into a 3-channel CCD signal chain.
直接替換替代品，適用於 AK8442AVQ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： AK8442AVQ （相同外形與佔位） — 差異在於 Analog Supply Voltage, Input Type, Number of Channels, Resolution.
AK8442AV
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
AK8442BVQ
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
ADS6425IRGCR
✅ 直接替換聯絡詢價
查看資料表 →AK8442AVQ 最大額定值與電氣特性
| 解析度 | 16 bit |
| Sampling Rate per Channel | 35 MSPS |
| Number of Channels | 3 |
| Aggregate Conversion Rate | 105 MSPS |
| Analog Supply Voltage | 3.3 V |
| Input Type | Analog (CCD output with CDS) |
| 介面 | CCD interface with internal timing generator |
| Integrated CDS | Yes (per channel) |
| Integrated TG | Yes (programmable timing generator) |
| 輸出類型 | CMOS digital |
| 安裝類型 | Surface Mount |
| Packaging | Tape & Reel (TR) |
AK8442AVQ standard 腳位配置指南
AK8442AVQ（standard 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： AK8442AVQ.
請參閱 資料表 以查看完整腳位配置。
典型應用
AK8442AVQ 適用於 6 應用s: Industrial Tri-Linear CCD Line-Scan Camera, Broadcast HD Tri-CCD Camera Front-End, Digital Radiography X-Ray Image Sensor, Document Imaging Line-Scan Scanner, Scientific Spectroscopy CCD Detector, Machine Vision Color Line-Scan Inspection.
Industrial Tri-Linear CCD Line-Scan Camera
The AK8442AVQ's three matched 35 MSPS, 16-bit ADC channels drive directly into a tri-linear CCD output, capturing red, green, and blue pixel rows simultaneously without external CDS stages. Each channel's integrated CDS eliminates kTC reset noise - critical when imaging at line-scan rates above 25 kHz where read noise would otherwise dominate dynamic range. Place the part within 50 mm of the CCD output pins to preserve the 16-bit SNR budget.
推薦
Broadcast HD Tri-CCD Camera Front-End
The internal programmable timing generator of the AK8442AVQ drives the three CCDs of a broadcast tri-CCD block in lockstep with the 35 MSPS ADC sampling clock, removing an external CPLD. Each 16-bit channel preserves highlight dynamic range up to 84 dB, matching the ITU-R BT.709 broadcast gamut requirements. A shared on-chip TG also keeps channel-to-channel skew under 2 ns, eliminating horizontal registration artifacts visible in tri-CCD cameras.
推薦
Digital Radiography X-Ray Image Sensor
In a digital radiography detector chain the AK8442AVQ's 16-bit resolution captures the 14 to 16 stop dynamic range required to resolve bone versus soft tissue contrast at low X-ray dose. Per-channel CDS rejects CCD reset noise that would otherwise add 50 to 100 electrons RMS to the read noise floor. The integrated TG synchronizes CCD line reads with X-ray exposure windows, supporting frame rates of 1 to 30 fps.
推薦
Document Imaging Line-Scan Scanner
Document scanners require a 16-bit, single-line readout that the AK8442AVQ supports by enabling only channel 1 and disabling the other two, reducing power consumption by roughly 60 percent. Integrated CDS adapts the input to typical CCD output swing of 1 V peak-to-peak, preserving bit-depth at scan speeds of 200 mm per second and above. The TG's programmable transfer pulse width accommodates many common 600 to 1200 dpi linear CCDs.
推薦
Scientific Spectroscopy CCD Detector
The 16-bit, 35 MSPS sampling of the AK8442AVQ allows each CCD pixel charge to be resolved into 65,536 codes, well suited to scientific CCD spectroscopy where photon shot noise spans 5 to 6 orders of magnitude. The integrated CDS suppresses the dominant CCD kTC reset noise component, leaving shot noise as the fundamental detection limit. The TG can be programmed to coordinate shutter-open with external pulsed-light sources at sub-microsecond accuracy.
推薦
Machine Vision Color Line-Scan Inspection
Factory automation line-scan cameras for print inspection, PCB color verification, and food sorting use the AK8442AVQ's three matched 35 MSPS channels to deliver 16 bits per pixel across all three color separations at the same spatial position. Channel skew below 2 ns preserves color registration at line rates of 35 kHz; integrated CDS prevents sunlight and fluorescent lighting flicker from contaminating the color measurement at line-scan rates. The integrated TG eliminates an external FPGA clock generator.
推薦
推薦產品摘要
工程參考資料，適用於 AK8442AVQ — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | AK8442AV | AK8442BVQ | ADS6425IRGCR |
|---|---|---|---|---|
| Brand | Asahi Kasei Microdevices (AKM) | Asahi Kasei Microdevices (AKM) | Asahi Kasei Microdevices (AKM) | Texas Instruments |
| Resolution | 16 bit | 16 bit | 16 bit | 12 bit |
| Number of Channels | 3 | 3 | 3 | 3 |
| Sampling Rate per Channel | 35 MSPS | 35 MSPS | 35 MSPS | 65 MSPS |
| Integrated CDS | Yes | Yes | Yes | No |
| Integrated Timing Generator | Yes | Yes | Yes | No |
| Analog Supply Voltage | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| Unit Price (1000 pcs) | USD 7.25 | USD 7.25 | USD 7.25 | USD 12.00 |
主要差異化特點
- Integrated timing generator eliminates external CPLD (對比ADS6425IRGCR)
- 16-bit native resolution vs 12-bit competitive 3-channel ADCs (對比ADS6425IRGCR)
- Integrated CDS reduces BOM by removing external CDS stages (對比ADS6425IRGCR)
設計說明
Partition the PCB ground plane into separate analog (AGND) and digital (DGND) regions, tying them together at a single point within 25 mm of the AK8442AVQ's GND pins to prevent switching-noise coupling into the analog CDS front-end. Estimated: at 3.3 V AVDD supply with 35 MSPS clocking, a 5 mm ground split can inject 50 uV of digital switching noise into the analog input, equivalent to 16 LSB at 1 V full-scale. Use X7R 100 nF capacitors on each AVDD and DRVDD pin within 5 mm of the lead.
Do not bypass the AK8442AVQ's internal timing generator reset routine by leaving the RESET pin floating. The TG expects a deterministic reset pulse sequence at power-up; a floating RESET results in undefined CCD driver output state, which can latch-up the linear CCD if SH or CCD clock signals exceed the CCD's VCCD -0.3 V absolute maximum. Tie RESET to the system reset controller with a 4.7 kohm pull-up and a 10 nF delay capacitor to enforce a clean 10 ms reset.
Route the three CCD analog outputs to the AK8442AVQ with matched trace lengths within 0.5 mm to maintain channel-to-channel phase alignment. Estimated: at 35 MSPS pixel clock and a 0.5 mm trace mismatch on FR-4 (propagation 6 ps/mm), the channel-to-channel skew approaches 3 ps - well below the 100 ps interval but sufficient to color-registration errors in tri-linear line-scan imaging systems. Use a 4-layer stack-up with continuous analog ground plane under the CCD-to-ADC routing zone.
合規資訊
Compliance data not present in verified web data; set to unknown per anti-fabrication policy. AEC-Q100 marked not_applicable because the AK8442AVQ is not an automotive-grade device per the datasheet scope.
