XRD8775AIU-F - 8-Bit 20MSPS Parallel ADC | MaxLinear | Exar
MPN： XRD8775AIU-F ✗ 停產XRD8775AIU-F 概覽
An analog-to-digital converter (ADC) is a data-acquisition integrated circuit that samples continuous analog signals and converts them into discrete digital codes. Flash ADCs like the XRD8775AIU-F use an array of comparators to deliver the fastest conversion times, typically reserved for video, instrumentation, and high-speed control loops where sub-microsecond conversion latency is mandatory. The 8-bit, 20MSPS segment sits at the entry level of high-speed conversion and is well suited for digitizing video bandwidths, IF signals, and oversampled measurement channels.
Key features per the manufacturer datasheet include 8-bit resolution, 20 MHz maximum sampling rate, an internal sample-and-hold (S/H) function, a single-ended analog input range of 0V to VDD, a reference input range of 1V to VDD, and typical power consumption of 75 mW (excluding reference current). The device provides latch-up free operation and ESD protection rated at 2000V minimum, simplifying board-level robustness.
The XRD8775AIU-F uses a flash converter architecture with a 1:1 S/H-to-ADC ratio, providing a single simultaneous sampling channel with a parallel 8-bit output bus. This architecture removes the need for an external track-and-hold amplifier in most digitizer front ends and simplifies downstream FPGA or ASIC capture logic.
Typical applications include standard-definition video digitizers, CCD/camera signal chains, ultrasound front-end signal conditioning, IF sampling for communications receivers, and high-speed industrial inspection systems. The 20MSPS capability comfortably handles component video and baseband IF signals up to about 7 MHz of input bandwidth.
When designing with this part, ensure the analog input drive network presents low source impedance at the Nyquist frequency and that the reference pin is decoupled with a low-ESR capacitor placed within 5 mm of the package pin. Because the part is sourced via MaxLinear (after the Exar acquisition) and is listed as obsolete in some distributor databases, confirm long-term supply before committing to high-volume production.
直接替換替代品，適用於 XRD8775AIU-F — 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： XRD8775AIU-F （相同外形與佔位） — 差異在於 Architecture, Resolution, Sampling Rate, ESD Protection, Operating Temperature.
XRD87L75AIU-F
✅ 直接替換📋 參考替代品（不在目錄中）
XRD8775AIU
✅ 直接替換聯絡詢價
查看資料表 →ADS930E
✅ 直接替換📋 參考替代品（不在目錄中）
AD9280ARSRL
✅ 直接替換聯絡詢價
查看資料表 →MAX197BEAI
✅ 直接替換📋 參考替代品（不在目錄中）
XRD8775AIU-F 最大額定值與電氣特性
| 解析度 | 8 bits |
| 取樣率 | 20 MSPS (max) |
| Number of Inputs | 1 |
| Input Type | Single-ended |
| Data Interface | Parallel |
| Configuration | S/H-ADC (1:1 ratio) |
| Architecture | Flash |
| Number of A/D Converters | 1 |
| Reference Type | External (1V to VDD range) |
| Analog Input Voltage Range (VIN) | 0 V to VDD |
| 供應電壓 | 5 V single supply |
| Power Dissipation (typ) | 75 mW (excluding reference) |
| 工作溫度 | -40C to +85C |
| 封裝 / 外殼 | 20-SSOP (0.209 inch / 5.30 mm width) |
| 安裝類型 | Surface Mount |
| Packaging | Tube |
| ESD Protection | 2000 V minimum (per datasheet) |
| Latch-up | Latch-up free |
| Internal Sample-and-Hold | Yes |
XRD8775AIU-F 腳位配置
| 腳位 1 | VINA — Analog input |
| 腳位 2 | AGND — Analog ground |
| 腳位 3 | VREF — Reference voltage input (1V to VDD) |
| 腳位 4 | VDD — +5V analog supply |
| 腳位 5 | DGND — Digital ground |
| 腳位 6 | DB0 — Digital output bit 0 (LSB) |
| 腳位 7 | DB1 — Digital output bit 1 |
| 腳位 8 | DB2 — Digital output bit 2 |
| 腳位 9 | DB3 — Digital output bit 3 |
| 腳位 10 | DB4 — Digital output bit 4 |
| 腳位 11 | DB5 — Digital output bit 5 |
| 腳位 12 | DB6 — Digital output bit 6 |
| 腳位 13 | DB7 — Digital output bit 7 (MSB) |
| 腳位 14 | OE — Output enable (active low) |
| 腳位 15 | CLK — Conversion clock input |
| 腳位 16 | NC — Not connected (per datasheet) |
| 腳位 17 | NC — Not connected (per datasheet) |
| 腳位 18 | NC — Not connected (per datasheet) |
| 腳位 19 | NC — Not connected (per datasheet) |
| 腳位 20 | VDD — +5V digital supply |
典型應用
XRD8775AIU-F 適用於 6 應用s: Standard-Definition Video Digitizer, CCD / CMOS Camera Signal Chain, Ultrasound Front-End Signal Digitization, IF Sampling for Communication Receivers, High-Speed Industrial Inspection, Test & Measurement Instrumentation.
Standard-Definition Video Digitizer
The XRD8775AIU-F is well matched to SD video digitizer front ends where 8-bit resolution at 20MSPS easily exceeds the Nyquist requirement for 6 MHz component video bandwidth. Its flash architecture delivers single-cycle conversion latency, which is essential for real-time video overlay and synchronization in broadcast, surveillance, and industrial inspection cameras. The single 5V supply and 0V-to-VDD analog input range allow direct coupling from typical video op-amp output stages, while the 20-pin SSOP package is small enough for compact multi-channel camera boards. Compared with a modern SAR ADC, the flash topology preserves analog transient behavior with zero pipeline delay, so gen-lock and chroma demodulation loops remain stable.
推薦
CCD / CMOS Camera Signal Chain
Camera designs benefit from the XRD8775AIU-F's 20MSPS throughput and internal sample-and-hold, which let the ADC sit directly after the correlated double-sampling front end without an external track-and-hold. The 0V-to-VDD input range accommodates raw CCD output levels shifted by an AC-coupling network, and the parallel 8-bit bus simplifies FPGA-based Bayer demosaic logic. Its 75 mW typical dissipation keeps multi-camera arrays thermally manageable, while the latch-up free CMOS process ensures long-term reliability in always-on machine-vision deployments. The 20-SSOP footprint also enables layout reuse between 8-bit standard and 10-bit upgrade variants.
推薦
Ultrasound Front-End Signal Digitization
Medical and industrial ultrasound front ends use the XRD8775AIU-F to digitize pre-beamformed analog signals at rates up to 20MSPS, capturing the bandwidth needed for shallow-depth imaging. The 5V single-supply operation simplifies the analog front end, and the flash architecture provides the deterministic single-cycle latency required for time-gain compensation alignment across multiple channels. The 75 mW power budget keeps per-channel thermal load low, which is critical when dozens of channels populate a transducer probe head. Designers can pair the ADC with a downstream FPGA for digital beamforming without worrying about pipeline delay mismatch between channels.
推薦
IF Sampling for Communication Receivers
Software-defined and intermediate-frequency radio receivers use the XRD8775AIU-F to digitize baseband or low-IF signals at 20MSPS, supporting bandwidths up to about 7 MHz with adequate margin for anti-alias filtering. The flash architecture delivers sub-microsecond latency, simplifying AGC loop design, while the parallel data bus feeds directly into FPGA or DSP demodulation blocks. The 5V analog supply and 1V-to-VDD reference range give designers flexibility to optimize SNR versus dynamic range for specific modulation schemes. Compared with pipelined ADCs, the XRD8775AIU-F avoids pipeline-fill latency that would otherwise complicate burst-mode demodulation.
推薦
High-Speed Industrial Inspection
Industrial inspection systems such as laser triangulation profilers and barcode scanners leverage the XRD8775AIU-F's 20MSPS throughput to capture fast transient analog events with high timing fidelity. The single-cycle conversion latency enables real-time threshold and edge detection in FPGA firmware, while the 0V-to-VDD input range simplifies interface with photodiode transimpedance amplifiers. The 75 mW dissipation and 20-SSOP package allow dense placement on multi-axis scanner boards without exceeding thermal budgets. Robust ESD protection of 2000V minimum also improves survivability in factory-floor environments with significant electrical noise.
推薦
Test & Measurement Instrumentation
Bench-top instruments and data loggers use the XRD8775AIU-F as a front-end digitizer for transient capture and oscilloscope-like recording where single-cycle latency and 8-bit resolution are sufficient. The 20MSPS sampling rate supports bandwidth measurement up to several MHz, and the parallel interface integrates easily with FPGA display and storage logic. The 5V single-supply operation and small 20-SSOP footprint simplify portable, battery-powered instrument design, while the latch-up free CMOS process ensures long calibration intervals in lab environments.
推薦
推薦產品摘要
工程參考資料，適用於 XRD8775AIU-F — 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 | XRD87L75AIU-F | XRD8775AIU | ADS930E | AD9280 | MAX197BEAI |
|---|---|---|---|---|---|---|
| Brand | MaxLinear (originally Exar) | MaxLinear | MaxLinear | Texas Instruments | Analog Devices | Analog Devices |
| Package | 20-SSOP | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same |
| Resolution | 8 bits | 8 bits | 8 bits | 8 bits | 8 bits | 12 bits |
| Sampling Rate | 20 MSPS | 10 MSPS | 20 MSPS | 30 MSPS | 32 MSPS | 0.1 MSPS |
| Architecture | Flash | Flash | Flash | Flash | Flash | SAR |
| Input Channels | 1 | 1 | 1 | 1 | 1 | 8 |
| Internal S/H | Yes | Yes | Yes | Yes | Yes | Yes |
| Supply Voltage | 5 V single | 5 V single | 5 V single | 5 V single | 5 V single | +/-5 V or +5 V to +15 V |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Active (legacy) | Obsolete |
主要差異化特點
- Single 5V supply with 0V-to-VDD input simplifies analog front-end design (對比MAX197BEAI)
- True single-cycle latency flash architecture (對比MAX197BEAI)
- Compact 20-SSOP footprint shared with modern 30+ MSPS flash ADCs (對比ADS930E)
設計說明
Place the VREF decoupling capacitor within 5 mm of the reference pin and use a low-ESR ceramic (0.1 uF in parallel with 10 uF) to minimize reference noise. The flash architecture draws current transients on every clock edge, so place a 0.1 uF supply decoupling capacitor next to each VDD pin and a 10 uF bulk capacitor on the analog supply trace. Estimated: at 20MSPS the supply current transient can reach tens of mA peak; without local decoupling this couples into the analog input and degrades SNR.
Keep the analog input trace short and surround it with a ground guard ring tied to AGND to reduce digital switching noise pickup. Route the parallel DB0-DB7 output bus away from the analog input pin and use a ground plane cut-out (or split digital/analog planes tied at one point) to prevent digital return currents from corrupting the analog front end. Maintain 50 ohm controlled impedance if the clock trace exceeds 25 mm.
Drive the analog input with a low-impedance op-amp output (source impedance below 100 ohm) so that the internal S/H settles within the acquisition aperture. For 20MSPS operation the input bandwidth requirement is approximately 10 MHz minimum, and op-amp selection should prioritize -3 dB bandwidth and distortion at that frequency. Estimated: settling error to 1 LSB at 8 bits requires input settling to 0.4% within the acquisition window.
Do not operate the analog input below 0V or above VDD - the datasheet specifies 0V to VDD only and overdrive can permanently damage the input. Ensure the reference voltage is stable before applying the conversion clock, since an unstable VREF during power-up causes erratic output codes. Verify that the OE pin is driven correctly (active low per datasheet) before sampling downstream logic, otherwise bus contention may occur.
合規資訊
RoHS and REACH compliance per MaxLinear product page. Not AEC-Q100 qualified; this part targets industrial and commercial temperature grades. Halogen-free status not explicitly stated in verified data.
