LTC2222IUK-11 - 11-Bit 105Msps ADC | Analog Devices
MPN： LTC2222IUK-11 ✓ 啟用中LTC2222IUK-11 概覽
An ADC (analog-to-digital converter) is a semiconductor device that converts continuous analog signals into discrete digital codes at a specified sampling rate, serving as the bridge between the analog front-end (amplifiers, filters, transducers) and the digital signal processor, FPGA, or microcontroller. The pipelined ADC architecture used in the LTC2222IUK-11 enables high sampling rates with low power by processing each sample through a cascade of low-resolution stages, balancing speed, resolution, and die area efficiently. Within the signal-chain hierarchy, the ADC sits after the anti-alias filter and before the digital decimator or processor.
Key features include 65.4 dB SNR and 80 dB SFDR for input frequencies up to 150 MHz, selectable ±0.5 V or ±1 V input ranges, no missing codes over temperature, optional clock duty-cycle stabilizer, and shutdown/nap modes for power management. The integrated sample-and-hold amplifier and CMOS-compatible outputs simplify interface to FPGAs and ASICs.
The pipelined architecture of the LTC2222IUK-11 uses multi-bit per-stage conversion with digital error correction, achieving low spurious content and high linearity while operating at 105 Msps. The clock duty-cycle stabilizer relaxes the timing requirement on the external encode clock source, allowing use of lower-cost oscillators without degrading AC performance.
Typical applications include wideband communications receivers, IF sampling in software-defined radio, cable head-end equipment, digital oscilloscopes, and medical imaging front-ends. The wide input bandwidth makes it suitable for undersampling IF architectures in cellular base-station designs. A key design consideration is providing a low-jitter encode clock and proper RF layout around the analog inputs to achieve the rated SNR; thermal management of the exposed pad is also important at full sampling rate.
直接替換替代品，適用於 LTC2222IUK-11 — 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： LTC2222IUK-11 （相同外形與佔位） — 差異在於 Package, Power Dissipation, Resolution, RoHS Status, Supply Voltage.
LTC2222IUK
✅ 直接替換📋 參考替代品（不在目錄中）
LTC2223IUK
✅ 直接替換📋 參考替代品（不在目錄中）
LTC2232IUK
✅ 直接替換📋 參考替代品（不在目錄中）
LTC2233IUK
✅ 直接替換📋 參考替代品（不在目錄中）
LTC2224IUK
✅ 直接替換📋 參考替代品（不在目錄中）
LTC2234IUK
✅ 直接替換📋 參考替代品（不在目錄中）
LTC2222IUK-11 最大額定值與電氣特性
| 解析度 | 11 bits (12-bit ADC family) |
| Sample Rate | 105 Msps |
| Number of Input Channels | 1 |
| Architecture | Pipelined |
| Input Bandwidth (Full Power) | 775 MHz |
| Signal-to-Noise Ratio (SNR) | 65.4 dB at 140 MHz input |
| Spurious-Free Dynamic Range (SFDR) | 80 dB at 150 MHz input |
| 輸入電壓範圍 | Selectable ±0.5 V or ±1 V |
| 供應電壓 | Single 3.3 V |
| Power Dissipation | 475 mW (typical at 105 Msps) |
| Missing Codes | None (guaranteed) |
| Output Format | CMOS |
| 工作溫度範圍 | -40C to +85C (industrial, I grade) |
| 封裝 | 48-QFN (7x7 mm, UK package) - MO-220-WKKD-2 |
| 安裝類型 | Surface Mount |
| Clock Duty Cycle Stabilizer | Yes (optional) |
| Shutdown / Nap Modes | Yes |
| Data Ready Output | Yes |
| RoHS 狀態 | Compliant (PBF suffix) |
| Lead-Free | Yes (PBF suffix) |
LTC2222IUK-11 腳位配置
| 腳位 1 | AIN+ — Differential analog input positive |
| 腳位 2 | AIN- — Differential analog input negative |
| 腳位 3 | SENSE — Reference mode select (internal/external) |
| 腳位 4 | VREF — Reference voltage bypass |
| 腳位 5 | REFT — Top reference decoupling |
| 腳位 6 | REFB — Bottom reference decoupling |
| 腳位 7 | REFCM — Common-mode reference |
| 腳位 8 | VDD — Analog 3.3 V supply |
| 腳位 9 | GND — Analog ground |
| 腳位 10 | ENC+ — Encode clock positive |
| 腳位 11 | ENC- — Encode clock complement |
| 腳位 12 | GND — Clock ground |
| 腳位 13 | CS — Chip select (active low) |
| 腳位 14 | SHUTDN |
| 腳位 15 | NAP — Nap mode (active low) |
| 腳位 16 | OGND — Output driver ground |
| 腳位 17 | OVDD — Output driver supply |
| 腳位 18 | D11 |
| 腳位 19 | D10 — Data output bit 10 |
| 腳位 20 | D9 — Data output bit 9 |
| 腳位 21 | D8 — Data output bit 8 |
| 腳位 22 | D7 — Data output bit 7 |
| 腳位 23 | D6 — Data output bit 6 |
| 腳位 24 | D5 — Data output bit 5 |
| 腳位 25 | D4 — Data output bit 4 |
| 腳位 26 | D3 — Data output bit 3 |
| 腳位 27 | D2 — Data output bit 2 |
| 腳位 28 | D1 — Data output bit 1 |
| 腳位 29 | D0 — LSB data output |
| 腳位 30 | NC — Not connected |
| 腳位 31 | OGND — Output driver ground |
| 腳位 32 | OVDD — Output driver supply |
| 腳位 33 | DR — Data ready output |
| 腳位 34 | NC — Not connected |
| 腳位 35 | NC — Not connected |
| 腳位 36 | NC — Not connected |
| 腳位 37 | OF — Output format select |
| 腳位 38 | RAND — Randomizer enable |
| 腳位 39 | DITH — Dither enable |
| 腳位 40 | MODE — Clock duty cycle stabilizer mode |
| 腳位 41 | GND — Analog ground |
| 腳位 42 | VDD — Analog 3.3 V supply |
| 腳位 43 | NC — Not connected |
| 腳位 44 | NC — Not connected |
| 腳位 45 | NC — Not connected |
| 腳位 46 | NC — Not connected |
| 腳位 47 | NC — Not connected |
| 腳位 48 | NC — Not connected |
典型應用
LTC2222IUK-11 適用於 6 應用s: Wideband Communications Receiver IF Sampling, Software-Defined Radio (SDR) Front-End, Cable Head-End Downstream Capture, Digital Oscilloscope and Data Acquisition, Medical Imaging Front-End (Ultrasound / Beamforming), Radar and Lidar Signal Processing.
Wideband Communications Receiver IF Sampling
The LTC2222IUK-11 suits wideband communications receiver IF sampling where the 775 MHz full-power input bandwidth and 105 Msps sample rate allow direct undersampling of IF carriers at 70-140 MHz without an external mixer-to-baseband stage. The 65.4 dB SNR and 80 dB SFDR preserve signal fidelity for demodulation of multi-carrier signals. Power consumption of 475 mW from a single 3.3 V supply simplifies thermal design in densely populated line-card PCBs. Clock duty-cycle stabilizer relaxes timing constraints when generating the encode clock from a low-cost PLL.
推薦
Software-Defined Radio (SDR) Front-End
Software-defined radio platforms benefit from the LTC2222IUK-11's wide analog input bandwidth, which captures large spectrum slices and pushes digitization closer to the antenna. The 11-bit resolution is sufficient for many narrowband demodulation schemes, while the CMOS outputs stream directly into an FPGA for real-time DDC processing. Selectable ±0.5 V or ±1 V input ranges accommodate different front-end LNA gain settings. Nap and shutdown modes enable duty-cycled battery operation in portable SDR gear.
推薦
Cable Head-End Downstream Capture
Cable head-end downstream capture digitizes the full DOCSIS downstream spectrum (54-1002 MHz) using high-IF sampling ADCs like the LTC2222IUK-11. The 775 MHz analog input bandwidth covers the highest downstream block, while the pipelined architecture delivers clean SNR for QAM demodulation. Single 3.3 V supply operation simplifies the rack-mount power architecture. Shutdown modes support redundant-path failover schemes common in head-end CMTS equipment.
推薦
Digital Oscilloscope and Data Acquisition
The LTC2222IUK-11 fits into mainstream digital oscilloscope and data acquisition front-ends where the 105 Msps rate and 775 MHz full-power bandwidth deliver real-time digitizing of repetitive and single-shot signals up to Nyquist. The 65.4 dB SNR supports 11 effective bits suitable for general-purpose measurement. Pin compatibility with the LTC2222 (12-bit) and LTC2223 (80 Msps) family lets OEMs flex resolution/speed without PCB rework, reducing SKU complexity.
推薦
Medical Imaging Front-End (Ultrasound / Beamforming)
Ultrasound and beamforming front-ends benefit from the LTC2222IUK-11's low power (475 mW) per channel, which keeps thermal load manageable when many channels are tiled across a probe. The 105 Msps sample rate matches typical RF ultrasound bandwidth (up to 40 MHz), and the 11-bit resolution is adequate for harmonic detection when paired with time-gain compensation. CMOS outputs interface directly to FPGA-based beamforming pipelines.
推薦
Radar and Lidar Signal Processing
Radar and lidar baseband signal chains benefit from the LTC2222IUK-11's combination of high sample rate, wide input bandwidth, and selectable input range. The 775 MHz bandwidth captures wideband chirp returns, and 11-bit resolution is sufficient for detecting closely spaced targets after matched filtering. Low-jitter encode clock requirements are relaxed by the integrated duty-cycle stabilizer, allowing use of standard CMOS clock sources.
推薦
推薦產品摘要
工程參考資料，適用於 LTC2222IUK-11 — 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 | LTC2222IUK | LTC2223IUK | LTC2232IUK | LTC2233IUK |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 48-QFN (7x7 mm, UK) | 48-QFN (7x7 mm, UK) | 48-QFN (7x7 mm, UK) | 48-QFN (7x7 mm, UK) | 48-QFN (7x7 mm, UK) |
| Resolution | 11 bits | 12 bits | 12 bits | 10 bits | 10 bits |
| Sample Rate | 105 Msps | 105 Msps | 80 Msps | 105 Msps | 80 Msps |
| Supply Voltage | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
主要差異化特點
- Wide 775 MHz analog input bandwidth for IF undersampling (對比LTC2233IUK (10-bit, 80 Msps))
- 11-bit resolution optimized for high-IF communications (對比LTC2222IUK (12-bit, 105 Msps))
- Pin-compatible family spans 80-135 Msps and 10/11/12-bit resolution (對比Standalone fixed-resolution ADC)
設計說明
Differential analog inputs (AIN+, AIN-) must be routed as a tightly-coupled differential trace (100 ohm differential impedance) with matched lengths to preserve SNR and SFDR at high input frequencies. Keep analog traces away from digital output lines and clock traces. Use a continuous ground plane on layer 2 directly beneath the analog input traces to minimize return-path discontinuities per Analog Devices evaluation board layout guidelines.
The exposed pad on the bottom of the 48-QFN package must be soldered to a ground copper pour with an array of thermal vias (typically 9-12 vias in a 3x3 grid) to achieve the specified thermal resistance. At 475 mW dissipation, the junction-to-ambient thermal resistance of the UK package (approximately 30 C/W with proper layout) limits the maximum ambient temperature to roughly 70 C at full sample rate before derating.
Decouple each VDD pin with a 0.1 uF ceramic capacitor placed within 3 mm of the pin, plus a 10 uF bulk capacitor near the analog supply pin. Keep digital OVDD and analog VDD supplies separate until they join at the regulator output; this prevents digital switching noise from coupling into the analog supply rail and degrading SNR.
Use a low-jitter encode clock source (< 1 ps RMS jitter) to achieve the rated SNR. The optional clock duty-cycle stabilizer (MODE pin) compensates for clock duty-cycle error but does not fix poor jitter performance. Verify that the encode clock signal meets the minimum amplitude specification (1V p-p differential) at the ENC+/ENC- pins at the full 105 MHz sample rate.
合規資訊
RoHS and lead-free compliance confirmed by PBF suffix per Analog Devices ordering information. AEC-Q100 qualification status not stated in the provided web data. Halogen-free status not stated in the provided data.
