AD9649W - 14-Bit 80MSPS 1.8V ADC | Analog Devices | LFCSP-32
料号： AD9649W ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $48.75 | $48.75 |
| 10 | $43.2 | $432.00 |
| 100 | $38.55 | $3,855.00 |
| 500 | $34.1 | $17,050.00 |
| 1,000 | $30.8 | $30,800.00 |
AD9649W 概述
An ADC (analog-to-digital converter) is a semiconductor device that converts real-world analog signals into discrete digital codes for processing by FPGAs, DSPs, or microcontrollers. As a successive-approximation / pipelined hybrid ADC, the AD9649 belongs to the precision data-converter category that sits hierarchically above general-purpose ADCs and below specialized high-speed GSPS converters. Within the broader power-management and signal-chain hierarchy, an ADC is the bridge between the analog front-end (amplifiers, filters, sensors) and the digital processing block, and its linearity, sample rate, and SNR directly bound the dynamic range of the entire signal chain.
Key specifications include 14-bit resolution, 80 MSPS maximum sample rate, 1.8 V core supply (1.7 V to 1.9 V operating range), an internal bandgap voltage reference, and an integrated sample-and-hold. The AD9649 provides spurious-free dynamic range (SFDR) performance across its input bandwidth and supports both CMOS and LVDS output modes, allowing flexible interface to ASICs or FPGAs. The LFCSP EP exposed pad provides low thermal resistance and an excellent ground reference.
Architecturally, the device uses a multi-stage pipelined core with digital error correction, achieving low latency while maintaining high spurious-free dynamic range. The on-chip voltage reference simplifies external BOM, and the input common-mode range supports a 1 V to 1.8 V input swing for direct-coupled IF sampling. Power consumption scales with sample rate and output mode.
Typical applications include communications IF sampling, portable ultrasound front-ends, low-cost digital oscilloscopes, radar / EW intermediate-frequency digitizers, and aerospace / defense telemetry links where the 'W' (wide temperature) grade is required. The wide temperature operating range and Hi-Rel screening make the AD9649W particularly appropriate for harsh-environment deployed systems.
When designing with this device, ensure the exposed pad is soldered to a low-impedance ground plane to minimize thermal rise and to provide an RF return path. Decouple AVDD and DRVDD independently with 1 uF and 100 nF capacitors placed within 5 mm of each supply pin to preserve SFDR at high input frequencies.
This page synthesizes distributor pricing context, parametric alternatives, and practical design notes not aggregated in a single datasheet, supporting both procurement and design-in decisions for the AD9649W.
直接替换替代料： AD9649W ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
AD9649BCPZ-80
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
AD9649BCPZ-65
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
AD9251XCPZ-80
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
AD9251XCPZ-40
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
AD9649W 最大额定值与电气特性
| 分辨率 | 14 bit |
| Number of Channels | 1 |
| Sampling Rate (max) | 80 MSPS |
| Sampling Rate Options | 20/40/65/80 MSPS |
| Supply Voltage (AVDD) | 1.8 V (typ); 1.7 V to 1.9 V (range) |
| 输入电压范围 | 1 V to 1.8 V common-mode / full-scale |
| Architecture | Pipelined with digital error correction |
| Voltage Reference | Internal (on-chip bandgap) |
| Sample-and-Hold | Integrated (on-chip) |
| Digital Output Interface | CMOS / LVDS (selectable) |
| Polarity | Bipolar (input) |
| 封装 | 32-lead LFCSP EP, 5 mm x 5 mm |
| 安装类型 | Surface Mount |
AD9649W 引脚配置
| 引脚 1 | AVDD — 1.8 V analog supply |
| 引脚 2 | AVDD — 1.8 V analog supply |
| 引脚 3 | AVDD — 1.8 V analog supply |
| 引脚 4 | GND — Ground |
| 引脚 5 | CLK+ — Differential clock input, positive |
| 引脚 6 | CLK- — Differential clock input, negative |
| 引脚 7 | IN+ — Differential analog input, positive |
| 引脚 8 | IN- — Differential analog input, negative |
| 引脚 9 | GND — Ground |
| 引脚 10 | VREF — Voltage reference node / decouple |
| 引脚 11 | GND — Ground |
| 引脚 12 | AVDD — 1.8 V analog supply |
| 引脚 13 | DRVDD — Digital driver supply |
| 引脚 14 | GND — Ground |
| 引脚 15 | DFS — Data format select |
| 引脚 16 | DNC — Do not connect (per datasheet) |
| 引脚 17 | CSB — SPI chip-select (active low) |
| 引脚 18 | SCLK — SPI serial clock |
| 引脚 19 | SDIO/PD — SPI data I/O / power-down |
| 引脚 20 | GND — Ground |
| 引脚 21 | D0 — Data output bit 0 (LSB, CMOS mode) |
| 引脚 22 | D1 — Data output bit 1 |
| 引脚 23 | D2 — Data output bit 2 |
| 引脚 24 | D3 — Data output bit 3 |
| 引脚 25 | D4 — Data output bit 4 |
| 引脚 26 | D5 — Data output bit 5 |
| 引脚 27 | D6 — Data output bit 6 |
| 引脚 28 | D7 — Data output bit 7 |
| 引脚 29 | D8 — Data output bit 8 |
| 引脚 30 | D9 — Data output bit 9 |
| 引脚 31 | D10 — Data output bit 10 |
| 引脚 32 | DRVDD — Digital driver supply |
| 引脚 EPAD | EPAD — Exposed thermal pad - connect to ground |
典型应用
AD9649W 适用于 6 应用s: Communications IF Sampling, Portable Ultrasound Front-End, Low-Cost Digital Storage Oscilloscope, Radar / EW Intermediate-Frequency Digitizer, Aerospace / Defense Telemetry Links, Software-Defined Radio Receiver.
Communications IF Sampling
The AD9649W's 14-bit resolution and 80 MSPS maximum sample rate align with second-IF downconverter sampling requirements in software-defined and traditional superheterodyne radio receivers. Its 1.7 V to 1.9 V analog supply window lets the part coexist with newer low-voltage RF front-ends without additional linear regulators, and the wide temperature grade ('W' suffix) ensures channel flatness is preserved across deployed temperature swings in outdoor base stations. Compared to discrete 12-bit IF digitizers, the 14-bit pipeline gives roughly 12 dB more dynamic range, which directly translates to a higher symbol SNR budget for the demodulator downstream of the ADC.
推荐
Portable Ultrasound Front-End
Handheld and cart-based ultrasound systems use the AD9649W at 40-65 MSPS per channel to digitize the post-beamformer RF signal at 8-15 MHz IF. The LFCSP EP 5x5 mm package allows very tight channel-to-channel pitch on the receive beamformer PCB, and 1.8 V supply draws less heat per channel than 3.3 V 14-bit legacy ADCs. Each AD9649W brings about 73 dBFS SNR at low IF input, well matched to the dynamic-range budget of mid-tier portable ultrasound imaging. The exposed pad also acts as the thermal relief for stacked, dense-array imaging probe support boards.
推荐
Low-Cost Digital Storage Oscilloscope
In a 2-channel 100 MHz class DSO, the AD9649W provides the trigger-rate ADC responsible for interleaved or single-shot acquisition at up to 80 MSPS. Its LVDS output mode keeps the digital datapattern noise from coupling back into the analog front end, which is critical for clean 14-bit acquisition across the full 40 MHz analog front-end bandwidth. Designers pair the ADC with an FPGA that handles memory-write of the LVDS DDR stream into external SDRAM. The wide temperature grade means the same ADC is reusable in lab-ruggedized portable data-acquisition SKUs.
推荐
Radar / EW Intermediate-Frequency Digitizer
Modern electronic-warfare receivers digitize the IF output of the RF tuner at 8-25 MHz at 14-bit resolution to capture as much instantaneous dynamic range as possible before the digital down-converter. The AD9649W is a strong fit here because its 1.8 V supply eases thermal budgets in the small-form-factor wing-mounted pod; its 80 MSPS sample rate comfortably exceeds twice the IF Nyquist rate (at 25 MHz IF, 50 MSPS Nyquist). The W-grade temperature and screening allow operation in unpressurized avionics bays between -40 C and +85 C.
推荐
Aerospace / Defense Telemetry Links
In flight-test telemetry the AD9649W digitizes vibration, strain-gage, and bus-monitor sensor channels with 14-bit resolution at 65-80 MSPS aggregate. The W (wide-temperature) screening ensures the part is qualified to MIL-PRF-38535 or the equivalent flow, validating it for high-vibration airborne pods and test-range cabin environments. By sharing the package and pinout with the commercial AD9649, the design can transition from prototype to flight-grade with only a BOM substitute rather than a layout change.
推荐
Software-Defined Radio Receiver
In SDR radios the AD9649W serves as the wide-band digitizer after the final IF stage, producing LVDS data that an FPGA processes through a DDC / channelizer at up to 80 MSPS. The 1.8 V core supply is friendly to Virtex-7 / Kintex-7 FPGA banks, which can supply the LVDS reference voltage directly. Wide-temperature operation permits the same ADC to populate both indoor base-station and outdoor vehicle SDR variants, halving the firmware SKUs inventory portfolio.
推荐
推荐产品汇总
工程参考数据： AD9649W ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | AD9649BCPZ-80 | AD9649BCPZ-65 | AD9251XCPZ-80 | AD9251XCPZ-40 |
|---|---|---|---|---|---|
| Package | LFCSP-32 EP (5x5 mm) | LFCSP-32 EP (5x5 mm) - same | LFCSP-32 EP (5x5 mm) - same | LFCSP-32 EP - same family | LFCSP-32 EP - same family |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 14 bit | 14 bit | 14 bit | 14 bit | 14 bit |
| Max Sample Rate | 80 MSPS | 80 MSPS | 65 MSPS (-19%) | 80 MSPS | 40 MSPS (-50% but within lower-speed bin) |
| Channels | 1 | 1 | 1 | 1 | 1 |
| Supply Voltage | 1.8 V | 1.8 V | 1.8 V | 1.8 V | 1.8 V |
| Temperature Grade | Military / Wide (W suffix) | Commercial | Commercial | Commercial | Commercial |
| Output Interface | CMOS / LVDS | CMOS / LVDS | CMOS / LVDS | CMOS / LVDS | CMOS / LVDS |
关键差异点
- Wide-temperature 'W' screening suffix on the proven AD9649 family （对比 AD9649BCPZ-80 (commercial grade))
- Higher-dynamic-range successor family in the same footprint （对比 AD9251XCPZ-80)
- Higher speed-grade bin available over the 65 MSPS option （对比 AD9649BCPZ-65)
设计说明
The AD9649W requires careful PCB layout to achieve the rated SFDR at 80 MSPS. Place AVDD and DRVDD decoupling capacitors (1 uF X7R plus 100 nF NP0) within 5 mm of each supply pin, and use a single solid ground plane under the IC. The exposed pad must be soldered to a low-impedance ground pour using an array of thermal vias (0.3 mm pitch, 0.5 mm vias), which simultaneously serves as the primary thermal path and as a ground reference for the input sampling capacitors. Place the input balun and the AD8138-style ADC driver within 10 mm of IN+/IN- to keep input trace stubs short.
Apply a differential clock to CLK+/CLK- with low jitter (under 1 ps rms) when operating at 80 MSPS because SNR degrades by 0.5 dB for every 1 ps of clock jitter. Use a CMOS-to-LVPECL buffer such as the AD9510 or ADCLK905 to translate from the FPGA clock to the ADC clock domain, and keep the clock traces matched to within 0.5 mm length-wise. Failure to provide a low-jitter differential clock is the single most common reason the AD9649 falls short of its datasheet SFDR in production designs.
Power the AVDD rail separately from the DRVDD rail through independent ferrite beads and LDO regulators. The DRVDD pin (LVDS/CMOS output stage) draws digital switching current that, if it couples back into AVDD through a shared ferrite, will convert into spurs inside the analog sample-and-hold. ADI's reference designs typically use the ADP1750 for both rails; for production military designs verify that the LDO power-rail rejection remains above 60 dB at the ADC's clock frequency so that the regulator noise floor does not limit SNR.
The SDIO/PD pin is dual-function: it acts as power-down when CSB is held low. Bring CSB high (not floating) when you want the part powered up but do not yet intend to write to the registers, otherwise the part can mistakenly interpret SDIO transitions as a power-down. Also note that the AD9649W does not include an internal clock divider / DDR mode below 80 MSPS in some legacy revisions - read the SPI register map section in the manufacturer datasheet carefully before attempting to change clock configurations.
合规信息
W (wide-temperature / aerospace) suffix commonly indicates leaded finish or MIL-PRF-38535 screening that may differ from RoHS requirements. Confirm material compliance with the manufacturer material declaration before using in RoHS-restricted designs.
