AD9225AR - 12-Bit 25 MSPS ADC | Analog Devices
MPN： AD9225AR ✓ 啟用中AD9225AR 概覽
An ADC is a data-conversion IC that samples an analog voltage and converts it into a numeric value. The AD9225 belongs to the pipelined ADC family, a multistage architecture commonly used for conversion rates from tens of megasamples per second to hundreds of megasamples per second. Within the broader semiconductor hierarchy, it is an analog-to-digital converter, data-converter IC, signal-processing IC, and mixed-signal semiconductor.
Key features include a 12-bit resolution, a 25 MSPS conversion rate, a guaranteed maximum differential nonlinearity error of 0.4 LSB, and guaranteed no missing codes. The converter includes both its sample-and-hold amplifier and voltage reference on chip, reducing the number of external analog components required. Its parallel output architecture supports direct connection to FPGA, CPLD, or data-capture logic for deterministic sampling throughput.
The AD9225 uses a multistage differential pipelined architecture and supports a differential input arrangement with VIN and VINB connections. The manufacturer datasheet recommends centering the analog-input common-mode voltage at approximately 2.5 V by driving VINB from a low-impedance 2.5 V source. With the VREF pin connected directly to SENSE, the reference voltage is 1 V and the corresponding input span is 2 V p-p; the stated valid input-signal range is 1.5 V to 3.5 V.
Typical uses include industrial process monitoring, communications infrastructure, digital oscilloscopes, radar and sonar signal chains, waveform capture, and precision control loops. The AD9225 is especially appropriate when 25 MSPS sampling is sufficient and parallel output provides an advantage over serial-interface converters. Its integrated sample-and-hold and reference functions simplify board design while the single +5 V supply reduces multi-rail complexity.
The main design trade-off is input bandwidth and signal integrity at 25 MSPS. Differential routing, controlled impedance, a low-noise +5 V supply, proper reference decoupling, and careful return-path management are essential for preserving full-scale accuracy. Engineers should also account for digital-output timing when routing 12 parallel data bits plus clock signals into acquisition logic.
This page consolidates the verified manufacturer specifications, current distributor availability, family pin-compatibility information, practical application guidance, and parameter-level replacement analysis. It is designed to help engineers determine whether the AD9225AR fits their acquisition architecture before purchasing or redesigning the board.
直接替換替代品，適用於 AD9225AR — 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： AD9225AR （相同外形與佔位） — 差異在於 Converter Type, Maximum Sampling Rate, Package, Supply Voltage.
AD9225AR 最大額定值與電氣特性
| Converter Type | Monolithic pipeline ADC |
| 解析度 | 12 bit |
| Maximum Sampling Rate | 25 MSPS |
| Architecture | Multistage differential pipelined |
| Input Configuration | Single input, differential analog input arrangement |
| 供應電壓 | +5 V |
| Power Dissipation | 280 mW |
| Maximum Differential Nonlinearity Error | 0.4 LSB |
| Missing Code Performance | No missing codes guaranteed |
| On-Chip Sample-and-Hold Amplifier | Yes |
| On-Chip Voltage Reference | Yes |
| Internal Reference Voltage | 1 V with VREF connected directly to SENSE |
| Input Span | 2 V p-p |
| Valid Input Signal Range | 1.5 V to 3.5 V |
| Recommended Input Common-Mode Voltage | Approximately 2.5 V |
| 封裝 | 28-pin SOIC W |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
AD9225AR 28-pin soic w 腳位配置指南
AD9225AR（28-pin soic w 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： AD9225AR.
請參閱 資料表 以查看完整腳位配置。
典型應用
AD9225AR 適用於 6 應用s: Communications Signal Acquisition, Industrial Process Monitoring, Digital Oscilloscope Front End, Radar and Sonar Return Processing, Precision Control and Measurement Loops, Data Acquisition and Test Equipment.
Communications Signal Acquisition
The AD9225AR fits communications and baseband acquisition systems requiring 12-bit conversion data at rates up to 25 MSPS. According to the AD9225 manufacturer datasheet Rev. C, the converter uses a multistage differential pipelined architecture and provides parallel outputs for direct capture by FPGA or CPLD logic. Place VIN and VINB on controlled-impedance, differentially routed traces and center the input common mode near 2.5 V. The principal benefit is deterministic parallel throughput, although system designers must verify bandwidth, output timing, and clock-crossing requirements against the downstream logic.
推薦
Industrial Process Monitoring
The AD9225AR is suitable for industrial measurement systems that need repeatable 12-bit samples at up to 25 MSPS without a multi-rail converter arrangement. According to the AD9225 manufacturer datasheet Rev. C, it operates from a single +5 V supply and integrates the sample-and-hold amplifier and voltage reference. Its 0.4 LSB maximum differential nonlinearity specification and guaranteed no-missing-code performance help support predictable signal-chain behavior. Use short analog traces, solid grounding, and decoupled supply rails, while ensuring the input remains within the specified 1.5 V to 3.5 V range.
推薦
Digital Oscilloscope Front End
The AD9225AR can serve as the analog acquisition stage in a digital oscilloscope or portable waveform instrument when 25 MSPS and 12-bit resolution are adequate. According to the AD9225 manufacturer datasheet Rev. C, the converter provides parallel digital outputs and integrates its sample-and-hold amplifier and voltage reference. The 280 mW typical dissipation supports a compact instrument architecture, but high-frequency board layout remains critical. Keep the analog path short, control return currents, and route the output clock and data together to minimize timing skew at the capture FPGA.
推薦
Radar and Sonar Return Processing
The AD9225AR is appropriate for intermediate-rate radar, sonar, and vibration-acquisition chains requiring 12-bit data at up to 25 MSPS. According to the AD9225 manufacturer datasheet Rev. C, its differential pipelined architecture and on-chip sample-and-hold amplifier support controlled conversion of analog returns into parallel digital words. The recommended 2.5 V common-mode level and 2 V p-p span simplify front-end matching when the input network is designed around those conditions. Engineers should budget extra routing margin for filtering, gain, aliasing control, and synchronization with the processing logic.
推薦
Precision Control and Measurement Loops
The AD9225AR can be used in closed-loop control and precision measurement systems that require more conversion throughput than a low-speed SAR ADC while accepting 12-bit resolution. According to the AD9225 manufacturer datasheet Rev. C, the converter achieves 25 MSPS, guarantees no missing codes, and limits differential nonlinearity to 0.4 LSB. Its single +5 V supply and integrated reference reduce system complexity, while parallel outputs permit direct transfer into digital control logic. Confirm acquisition latency and output timing in the complete loop because the supplied excerpts do not specify a pipeline-delay value.
推薦
Data Acquisition and Test Equipment
The AD9225AR is well suited to modular data-acquisition equipment, automated test systems, and instrumentation that captures repetitive analog waveforms at 25 MSPS. According to the AD9225 manufacturer datasheet Rev. C, its 12-bit parallel output can feed FPGA-based acquisition and processing logic without a serial interface. The integrated sample-and-hold amplifier and reference reduce external component count, while the single +5 V supply simplifies power planning. For dependable measurements, decouple both the supply and reference network, preserve the 2.5 V common-mode requirement, and verify output timing across temperature and process conditions.
推薦
工程參考資料，適用於 AD9225AR — 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 | AD9220AR |
|---|---|---|
| Package | 28-pin SOIC W | 28-pin SOIC W |
| Brand | Analog Devices | Analog Devices |
主要差異化特點
- Integrated acquisition front end (對比AD9220AR)
- Guaranteed conversion linearity and code continuity (對比AD9220AR)
- Single +5 V acquisition architecture (對比AD9220AR)
設計說明
Route the analog input as a short, controlled-impedance differential pair and preserve the approximately 2.5 V common-mode requirement identified in the AD9225 manufacturer datasheet Rev. C. Keep the VINB return path continuous and closely coupled to VIN to minimize common-mode conversion and susceptibility to noise. Avoid routing the clock and parallel data through the analog-input region, and place any gain or filtering network close enough to the converter to minimize accumulated propagation delay.
Decouple the single +5 V supply close to the device and isolate it from switching converters and digital output currents. The AD9225 has 280 mW typical dissipation, but converter reference performance can still be disturbed by supply ripple. Use low-ESR local bypass capacitance with the values and layout prescribed by the complete manufacturer datasheet. The supplied excerpts also require capacitor networks on CAPT and CAPB for proper reference decoupling, so do not omit those network components.
Do not assume that every ADI family member with a similar 28-pin package is an electrically equivalent replacement. The manufacturer states pin compatibility with AD9220, AD9221, AD9223, and AD9224, but conversion rate, output timing, input bandwidth, and power can differ. Before substituting a family member, compare the complete AD9225 and candidate data sheets, especially clock latency, output timing, input voltage range, and acquisition bandwidth.
合規資訊
The verified Mouser search result identifies AD9225AR as RoHS compliant. The supplied excerpts do not provide REACH, lead-free, halogen-free, or conflict-minerals declarations; AEC-Q100 is not applicable because this is an analog-to-digital converter rather than an automotive-qualified device.
