LTC2274IUJ - 16-Bit 105Msps Serial ADC, 40-QFN | Analog Devices
MPN: LTC2274IUJ ✓ Hoạt độngLTC2274IUJ Tóm tắt
An ADC (analog-to-digital converter) is a data-converter subcategory of mixed-signal integrated circuits whose role is to sample continuous analog waveforms and produce discrete digital words at a defined sample rate. In the system hierarchy, the LTC2274IUJ sits between analog front-end signal conditioning (amplifiers, filters, transformers) and the FPGA/ASIC that consumes the digital data, placing it firmly inside the data-converter branch of the signal-chain taxonomy.
Key features include 16-bit resolution at 105 Msps, 700 MHz analog input bandwidth, a programmable-gain amplifier (PGA) front end for input-range tuning, and a serialized LVDS output that minimizes pin count and simplifies PCB routing into modern FPGAs. The part shares a pin-compatible pinout across the LTC2272/LTC2273/LTC2274 family, allowing 65/80/105 Msps system scaling without PCB rework.
Typical applications include basestation receivers, radar and lidar digitizers, high-end medical imaging, communications test equipment, and any wideband signal-chain that needs low-noise 16-bit conversion with a low-pin-count interface. The wide analog input bandwidth lets the same ADC digitize both baseband and IF signals after appropriate anti-alias filtering.
When designing with this part, place the analog input network (transformer or driver amp) and the 40-QFN decoupling network as close as possible to the device. Use the PGA feature to optimize SFDR versus SNR for each end application, and ensure the LVDS serialization lanes are length-matched for clean FPGA capture.
This page synthesizes verified distributor pricing, pin-compatible drop-in alternatives from the LTC227x family, and practical design notes not found in the manufacturer datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho LTC2274IUJ — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với LTC2274IUJ (cùng hình factor và footprint) — khác nhau ở Output Interface, Package, Resolution, RoHS Status.
LTC2273IUJ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC2272IUJ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC2274IUJ#TR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC2274IUJ#PBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC2274IUJ Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 16 bits |
| Sample Rate | 105 Msps |
| Input Channels | 1 |
| Architecture | Pipelined |
| Input Bandwidth | 700 MHz |
| Front-End | PGA (programmable gain amplifier) |
| Output Interface | High-speed serial LVDS |
| Hộp | 40-pin QFN (6 mm × 6 mm) |
| Kiểu lắp đặt | Surface Mount |
| Temperature Grade | Industrial |
| Trạng thái RoHS | Compliant (#PBF suffix) |
Cấu hình chân LTC2274IUJ
| Chân 1 | AIN+ — Differential analog input positive |
| Chân 2 | AIN- — Differential analog input negative |
| Chân 3 | VREF — Voltage reference decoupling |
| Chân 4 | GND — Analog ground |
| Chân 5 | AVDD — Analog supply |
| Chân 6 | SENSE — PGA full-scale range select |
| Chân 7 | MODE — PGA mode / output format select |
| Chân 8 | GND — Analog ground |
| Chân 9 | AVDD — Analog supply |
| Chân 10 | ENC+ — Encode clock positive |
| Chân 11 | ENC- — Encode clock negative |
| Chân 12 | GND — Digital ground |
| Chân 13 | OVDD — Output driver supply |
| Chân 14 | NC — Not connected (per datasheet) |
| Chân 15 | NC — Not connected (per datasheet) |
| Chân 16 | OUT+ — Serial LVDS data positive |
| Chân 17 | OUT- — Serial LVDS data negative |
| Chân 18 | FRAME+ — LVDS frame clock positive |
| Chân 19 | FRAME- — LVDS frame clock negative |
| Chân 20 | CLKOUT+ — LVDS bit clock positive |
| Chân 21 | CLKOUT- — LVDS bit clock negative |
| Chân 22 | GND — Digital ground |
| Chân 23 | OVDD — Output driver supply |
| Chân 24 | NC — Not connected (per datasheet) |
| Chân 25 | NC — Not connected (per datasheet) |
| Chân 26 | CS — Chip select / serial control |
| Chân 27 | SCK — Serial control clock |
| Chân 28 | SDI — Serial control data in |
| Chân 29 | SDO — Serial control data out |
| Chân 30 | GND — Digital ground |
| Chân 31 | DVDD — Digital core supply |
| Chân 32 | GND — Digital ground |
| Chân 33 | NC — Not connected (per datasheet) |
| Chân 34 | NC — Not connected (per datasheet) |
| Chân 35 | NC — Not connected (per datasheet) |
| Chân 36 | NC — Not connected (per datasheet) |
| Chân 37 | AVDD — Analog supply |
| Chân 38 | GND — Analog ground |
| Chân 39 | VCM — Common-mode voltage output |
| Chân 40 | GND — Analog ground (exposed pad) |
Ứng dụng tiêu biểu
LTC2274IUJ phù hợp cho 6 Áp dụngs: Wireless Basestation Receiver, Radar and Lidar Digitizer, Communications Test and Measurement, Medical Imaging (Ultrasound / MRI Front-End), Software Defined Radio (SDR), Industrial Data-Acquisition Systems.
Wireless Basestation Receiver
The LTC2274IUJ's 105 Msps sample rate and 700 MHz analog input bandwidth let it digitize IF outputs of basestation receivers directly after an anti-alias filter, eliminating a down-conversion stage. Its 16-bit resolution preserves modulation EVM while the PGA front end allows the input range to be tuned for the IF level at the receiver chain output. The serialized LVDS interface minimizes PCB traces between the ADC and the FPGA baseband processor, which is critical in dense basestation line-card layouts where routing is constrained.
Được đề xuất
Radar and Lidar Digitizer
Wideband radar and lidar returns demand high analog input bandwidth combined with high ENOB, which the LTC2274IUJ's 700 MHz input bandwidth and 16-bit resolution deliver. The PGA lets the designer compress the input full-scale range to maximize SFDR on small near-field returns while still capturing far-field pulses without saturation. The pipelined 105 Msps architecture provides deterministic latency, which simplifies range-bin alignment in pulsed-radar signal-processing firmware and FPGA logic.
Được đề xuất
Communications Test and Measurement
Vector signal analyzers and arbitrary-waveform digitizers need wide analog bandwidth, low distortion, and clean handoff to FPGA signal-processing blocks, all of which the LTC2274IUJ provides. The serialized LVDS output keeps FPGA pin usage manageable even when multiple ADCs are ganged for parallel-channel test sets. The PGA front end allows the test-set designer to tune SNR versus SFDR per measurement standard (LTE, 5G NR, Wi-Fi 6E), giving one ADC platform flexibility across multiple test routines without re-calibration.
Được đề xuất
Medical Imaging (Ultrasound / MRI Front-End)
Medical imaging front-ends digitize wide-dynamic-range signals from transducer arrays, and the LTC2274IUJ's 16-bit resolution preserves small echoes without saturating on large returns. The PGA front end is particularly valuable in beamformer channels where input levels vary widely across transducer elements. With 700 MHz input bandwidth, the part can capture high-frequency ultrasound harmonics used for harmonic-imaging modes, and its pipelined architecture provides low deterministic latency for real-time image reconstruction.
Được đề xuất
Software Defined Radio (SDR)
Wideband SDR platforms need to digitize large swaths of spectrum in a single ADC, and the LTC2274IUJ's 700 MHz input bandwidth supports direct sampling of HF, VHF, and lower-UHF bands. The 16-bit resolution lets sensitive weak-signal modes (e.g., amateur radio, ADS-B, spectrum monitoring) coexist with strong-signal modes without an aggressive front-end attenuator. The serialized LVDS interface routes directly into FPGA FFT pipelines used for real-time spectrum display and demodulation.
Được đề xuất
Industrial Data-Acquisition Systems
High-speed industrial data-acquisition modules (vibration analysis, acoustic emission, partial-discharge monitoring) need both wide analog bandwidth and high dynamic range, and the LTC2274IUJ provides both. The industrial-temperature grade (IUJ suffix) guarantees operation across factory-floor thermal environments without derating. The serialized LVDS interface integrates cleanly into FPGA-based industrial controllers, and the pin-compatible family (LTC2272/3/4) lets one PCB design support multiple speed grades for product-line scaling.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LTC2274IUJ — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | LTC2273IUJ | LTC2272IUJ | LTC2274IUJ#TR |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 40-QFN (6x6) | 40-QFN (6x6) - same | 40-QFN (6x6) - same | 40-QFN (6x6) - same |
| Sample Rate | 105 Msps | 80 Msps | 65 Msps | 105 Msps |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits |
| Input Bandwidth | 700 MHz | 700 MHz | 700 MHz | 700 MHz |
| Architecture | Pipelined | Pipelined | Pipelined | Pipelined |
| Front-End | PGA | PGA | PGA | PGA |
| Output Interface | Serial LVDS | Serial LVDS | Serial LVDS | Serial LVDS |
| Temperature Grade | Industrial (I-suffix) | Industrial (I-suffix) | Industrial (I-suffix) | Industrial (I-suffix) |
Bảo phân biệt quan trọng
- Highest sample rate in the LTC227x pin-compatible family (vsLTC2273IUJ)
- Wider sample-rate headroom than the LTC2272 (vsLTC2272IUJ)
- Industrial temperature grade vs commercial parts (vsLTC2274CUJ)
Ghi chú thiết kế
The 40-QFN package has an exposed thermal/ground pad on the underside that must be soldered to a continuous ground plane for both electrical performance and thermal dissipation. Place input analog traces (AIN+/AIN-) as a tightly length-matched differential pair routed directly from the transformer or driver amp output to the ADC pins; keep these traces short, guarded by ground, and isolated from the digital output LVDS pairs to avoid coupling digital switching noise into the analog front end. Place the 0.1 uF and 10 uF decoupling capacitors as close as possible to each AVDD/DVDD/OVDD pin pair.
The LVDS output pairs (OUT+/OUT-, FRAME+/FRAME-, CLKOUT+/CLKOUT-) must be routed as 100-ohm differential pairs with length matching within a few millimeters of each other, since mismatched pair lengths translate directly into inter-symbol jitter at the FPGA receiver. Keep these traces on an inner PCB layer with a continuous ground plane below, and avoid right-angle bends; use 45-degree bends or curved routing. The encode clock (ENC+/ENC-) is the most sensitive trace in the entire layout and should be treated as a dedicated clock-distribution net with controlled impedance and isolated from all data outputs.
Do not leave the SENSE pin floating; it programs the PGA full-scale input range and must be tied to a defined logic level (high, low, or resistor-divider mid-rail) per the datasheet to set the desired input range. Avoid running digital return currents through the analog ground plane, which can corrupt the PGA reference and degrade SFDR; use a star-ground or split-plane approach with a single bridge under the ADC. The NC pins must remain unconnected per the datasheet, but their land pads should still be present in the PCB footprint for package-mechanical reliability.
Thông tin tuân thủ
RoHS compliant per the #PBF suffix in the verified distributor listings (DigiKey 1985717, Mouser). Industrial-temperature grade per IUJ suffix. AEC-Q100 not applicable - this is a data converter, not an automotive-grade IC.
