LTC2222IUK-11 - 11-Bit 105Msps ADC | Analog Devices
MPN: LTC2222IUK-11 ✓ פעילLTC2222IUK-11 סקירה
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.
חלופות תחליף ישיר עבור LTC2222IUK-11 — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם LTC2222IUK-11 (אותו גורם צורה וטביעת רגל) — שונים ב Package, Power Dissipation, Resolution, RoHS Status, Supply Voltage.
LTC2222IUK
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
LTC2223IUK
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
LTC2232IUK
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
LTC2233IUK
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
LTC2224IUK
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
LTC2234IUK
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
LTC2222IUK-11 דירוגים מרביים ומאפיינים חשמליים
| רזולוציה | 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 |
| טווח מתח כניסה | Selectable ±0.5 V or ±1 V |
| מתח אספקה | Single 3.3 V |
| Power Dissipation | 475 mW (typical at 105 Msps) |
| Missing Codes | None (guaranteed) |
| Output Format | CMOS |
| טווח טמפרטורת פעולה | -40C to +85C (industrial, I grade) |
| מארז | 48-QFN (7x7 mm, UK package) - MO-220-WKKD-2 |
| סוג הרכבה | Surface Mount |
| Clock Duty Cycle Stabilizer | Yes (optional) |
| Shutdown / Nap Modes | Yes |
| Data Ready Output | Yes |
| סטטוס RoHS | Compliant (PBF suffix) |
| Lead-Free | Yes (PBF suffix) |
תצורת פינים של LTC2222IUK-11
| פין 1 | AIN+ — Differential analog input positive |
| פין 2 | AIN- — Differential analog input negative |
| פין 3 | SENSE — Reference mode select (internal/external) |
| פין 4 | VREF — Reference voltage bypass |
| פין 5 | REFT — Top reference decoupling |
| פין 6 | REFB — Bottom reference decoupling |
| פין 7 | REFCM — Common-mode reference |
| פין 8 | VDD — Analog 3.3 V supply |
| פין 9 | GND — Analog ground |
| פין 10 | ENC+ — Encode clock positive |
| פין 11 | ENC- — Encode clock complement |
| פין 12 | GND — Clock ground |
| פין 13 | CS — Chip select (active low) |
| פין 14 | SHUTDN |
| פין 15 | NAP — Nap mode (active low) |
| פין 16 | OGND — Output driver ground |
| פין 17 | OVDD — Output driver supply |
| פין 18 | D11 |
| פין 19 | D10 — Data output bit 10 |
| פין 20 | D9 — Data output bit 9 |
| פין 21 | D8 — Data output bit 8 |
| פין 22 | D7 — Data output bit 7 |
| פין 23 | D6 — Data output bit 6 |
| פין 24 | D5 — Data output bit 5 |
| פין 25 | D4 — Data output bit 4 |
| פין 26 | D3 — Data output bit 3 |
| פין 27 | D2 — Data output bit 2 |
| פין 28 | D1 — Data output bit 1 |
| פין 29 | D0 — LSB data output |
| פין 30 | NC — Not connected |
| פין 31 | OGND — Output driver ground |
| פין 32 | OVDD — Output driver supply |
| פין 33 | DR — Data ready output |
| פין 34 | NC — Not connected |
| פין 35 | NC — Not connected |
| פין 36 | NC — Not connected |
| פין 37 | OF — Output format select |
| פין 38 | RAND — Randomizer enable |
| פין 39 | DITH — Dither enable |
| פין 40 | MODE — Clock duty cycle stabilizer mode |
| פין 41 | GND — Analog ground |
| פין 42 | VDD — Analog 3.3 V supply |
| פין 43 | NC — Not connected |
| פין 44 | NC — Not connected |
| פין 45 | NC — Not connected |
| פין 46 | NC — Not connected |
| פין 47 | NC — Not connected |
| פין 48 | NC — Not connected |
יישומים טיפוסיים
LTC2222IUK-11 מתאים עבור 6 יישוםs: 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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
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.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור LTC2222IUK-11 — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | 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 |
מבדילים עיקריים
- Wide 775 MHz analog input bandwidth for IF undersampling (לעומתLTC2233IUK (10-bit, 80 Msps))
- 11-bit resolution optimized for high-IF communications (לעומתLTC2222IUK (12-bit, 105 Msps))
- Pin-compatible family spans 80-135 Msps and 10/11/12-bit resolution (לעומתStandalone fixed-resolution ADC)
הערות תכנון
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.
מידע על תאימות
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.
