LTC2222IUK-11 - 11-Bit 105Msps ADC | Analog Devices
MPN: LTC2222IUK-11 ✓ AktifLTC2222IUK-11 Ringkasan
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.
Alternatif penggantian untuk LTC2222IUK-11 — paket yang sama, pin-pada-pin kompatibel. Bagian paket yang berbeda memerlukan kerja ulang PCB diabaikan.
Variasi di dalam seri ini
Model-series yang sama yang kompatibel dengan penggantian LTC2222IUK-11 (sama faktor bentuk dan footprint) — berbeda di dalam Package, Power Dissipation, Resolution, RoHS Status, Supply Voltage.
LTC2222IUK
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
LTC2223IUK
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
LTC2232IUK
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
LTC2233IUK
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
LTC2224IUK
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
LTC2234IUK
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
LTC2222IUK-11 Rating Maksimal & Karakteristik Listrik
| Resolusi | 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 |
| Rentang Tegangan Masukan | Selectable ±0.5 V or ±1 V |
| Tegangan Pemuat | Single 3.3 V |
| Power Dissipation | 475 mW (typical at 105 Msps) |
| Missing Codes | None (guaranteed) |
| Output Format | CMOS |
| Rentang Suhu Kerja | -40C to +85C (industrial, I grade) |
| Paket | 48-QFN (7x7 mm, UK package) - MO-220-WKKD-2 |
| Tipe Mounting | Surface Mount |
| Clock Duty Cycle Stabilizer | Yes (optional) |
| Shutdown / Nap Modes | Yes |
| Data Ready Output | Yes |
| Status RoHS | Compliant (PBF suffix) |
| Lead-Free | Yes (PBF suffix) |
Konfigurasi Pin LTC2222IUK-11
| Pin produk 1 | AIN+ — Differential analog input positive |
| Pin produk 2 | AIN- — Differential analog input negative |
| Pin produk 3 | SENSE — Reference mode select (internal/external) |
| Pin produk 4 | VREF — Reference voltage bypass |
| Pin produk 5 | REFT — Top reference decoupling |
| Pin produk 6 | REFB — Bottom reference decoupling |
| Pin produk 7 | REFCM — Common-mode reference |
| Pin produk 8 | VDD — Analog 3.3 V supply |
| Pin produk 9 | GND — Analog ground |
| Pin produk 10 | ENC+ — Encode clock positive |
| Pin produk 11 | ENC- — Encode clock complement |
| Pin produk 12 | GND — Clock ground |
| Pin produk 13 | CS — Chip select (active low) |
| Pin produk 14 | SHUTDN |
| Pin produk 15 | NAP — Nap mode (active low) |
| Pin produk 16 | OGND — Output driver ground |
| Pin produk 17 | OVDD — Output driver supply |
| Pin produk 18 | D11 |
| Pin produk 19 | D10 — Data output bit 10 |
| Pin produk 20 | D9 — Data output bit 9 |
| Pin produk 21 | D8 — Data output bit 8 |
| Pin produk 22 | D7 — Data output bit 7 |
| Pin produk 23 | D6 — Data output bit 6 |
| Pin produk 24 | D5 — Data output bit 5 |
| Pin produk 25 | D4 — Data output bit 4 |
| Pin produk 26 | D3 — Data output bit 3 |
| Pin produk 27 | D2 — Data output bit 2 |
| Pin produk 28 | D1 — Data output bit 1 |
| Pin produk 29 | D0 — LSB data output |
| Pin produk 30 | NC — Not connected |
| Pin produk 31 | OGND — Output driver ground |
| Pin produk 32 | OVDD — Output driver supply |
| Pin produk 33 | DR — Data ready output |
| Pin produk 34 | NC — Not connected |
| Pin produk 35 | NC — Not connected |
| Pin produk 36 | NC — Not connected |
| Pin produk 37 | OF — Output format select |
| Pin produk 38 | RAND — Randomizer enable |
| Pin produk 39 | DITH — Dither enable |
| Pin produk 40 | MODE — Clock duty cycle stabilizer mode |
| Pin produk 41 | GND — Analog ground |
| Pin produk 42 | VDD — Analog 3.3 V supply |
| Pin produk 43 | NC — Not connected |
| Pin produk 44 | NC — Not connected |
| Pin produk 45 | NC — Not connected |
| Pin produk 46 | NC — Not connected |
| Pin produk 47 | NC — Not connected |
| Pin produk 48 | NC — Not connected |
Aplikasi Umum
LTC2222IUK-11 cocok untuk 6 aplikasis: 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.
Direkomendasikan
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.
Direkomendasikan
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.
Direkomendasikan
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.
Direkomendasikan
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.
Direkomendasikan
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.
Direkomendasikan
Ringkasan Produk Direkomendasikan
Data referensi engineering untuk LTC2222IUK-11 — pembandingan, panduan desain, dan informasi konformitas.
Panduan Pemilihan
Pembandingan dengan Alternatif
| Parameter Umum | Produk Ini | 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 |
Diferensiator Kunci
- Wide 775 MHz analog input bandwidth for IF undersampling (vsLTC2233IUK (10-bit, 80 Msps))
- 11-bit resolution optimized for high-IF communications (vsLTC2222IUK (12-bit, 105 Msps))
- Pin-compatible family spans 80-135 Msps and 10/11/12-bit resolution (vsStandalone fixed-resolution ADC)
Catatan Desain
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.
Informasi Konformitas
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.
