LTC2194CUKG - 16-Bit 105Msps Dual ADC, 52-QFN | Analog Devices
MPN: LTC2194CUKG ✓ Hoạt độngLTC2194CUKG Tóm tắt
A pipelined ADC is a high-speed data converter architecture that uses multiple low-resolution flash stages interleaved with sample-and-hold and DAC residue amplifiers to achieve conversion rates from tens to hundreds of megasamples per second, while preserving 12-16 bit resolution. Pipelined ADCs occupy the middle ground between successive-approximation (SAR) converters (low power, single-shot) and flash ADCs (very high speed, low resolution). Within a signal chain they sit between the analog front end (LNA, mixer, anti-alias filter) and the digital back end (FPGA, ASIC, DSP), translating conditioned IF or baseband signals into parallel LVDS/LVCMOS words for downstream demodulation or beamforming. The dual-channel, simultaneous-sampling variant, which the LTC2194CUKG represents, is a key building block in modern multi-channel radio designs.
Key features of the LTC2194CUKG include a 1.8 V analog and digital supply rail, an optional low-power mode that reduces consumption at lower sample rates, programmable full-scale input range, and per-channel LVCMOS outputs that interface directly with FPGAs. The 52-QFN exposed-pad package provides a low thermal-resistance path and a compact 7x8 mm PCB footprint, enabling dense multi-channel layouts.
Typical applications include LTE and W-CDMA diversity receivers, multi-carrier base-station digitizers, cable-headend downstream capture, medical imaging receivers, and radar/EW intermediate-frequency sampling. The ultralow jitter also makes it suitable for direct IF sampling in software-defined radio and instrumentation front ends.
When designing with the LTC2194CUKG, use a low-jitter clock source (such as a clean crystal oscillator or clock distribution IC) and tightly bypass each supply pin with a 0.1 microfarad ceramic capacitor plus a bulk tantalum or polymer cap. The exposed thermal pad must be soldered to a continuous ground plane for thermal and electrical performance, and the analog and digital ground planes should be joined only at the IC's exposed pad to prevent digital switching noise coupling into the analog inputs.
This page synthesizes the official datasheet, current distributor pricing, drop-in same-family and cross-brand alternatives, and practical design notes not found on standard distributor product pages.
Bộ thay thế dễ dàng lắp đặt cho LTC2194CUKG — 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 LTC2194CUKG (cùng hình factor và footprint) — khác nhau ở Operating Temperature Range, RoHS Status, Aperture Jitter, Input Type, Package.
LTC2194IUKG#PBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC2195CUKG#PBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC2193CUKG#PBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC2190CUKG
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LTC2191CUKG#PBF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LTC2194CUKG Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 16 bit |
| Number of Channels | 2 (simultaneous sampling) |
| Sample Rate | 105 Msps |
| Architecture | Pipelined |
| Input Type | Differential |
| SNR | 76.8 dB |
| SFDR | 90 dB |
| Aperture Jitter | 0.07 psRMS |
| Điện áp cung cấp | 1.8 V |
| Output Interface | Parallel LVCMOS |
| Hộp | 52-QFN (7x8 mm) with exposed pad |
| Kiểu lắp đặt | Surface Mount |
| Khoảng nhiệt độ hoạt động | 0 C to +70 C (C grade) |
| Cấp MSL | 3 |
| Trạng thái RoHS | Compliant (#PBF suffix) |
| Lead-Free | Yes |
Cấu hình chân LTC2194CUKG
| Chân 1 | GND — Ground |
| Chân 2 | IN1+ — Channel 1 differential analog input positive |
| Chân 3 | IN1- — Channel 1 differential analog input negative |
| Chân 4 | GND — Ground |
| Chân 5 | IN2+ — Channel 2 differential analog input positive |
| Chân 6 | IN2- — Channel 2 differential analog input negative |
| Chân 7 | GND — Ground |
| Chân 8 | VREF — Voltage reference bypass |
| Chân 9 | GND — Ground |
| Chân 10 | OGND — Output driver ground |
| Chân 11 | D2_0 — Channel 2 data output bit 0 (LSB) |
| Chân 12 | D2_1 — Channel 2 data output bit 1 |
| Chân 13 | D2_2 — Channel 2 data output bit 2 |
| Chân 14 | D2_3 — Channel 2 data output bit 3 |
| Chân 15 | D2_4 — Channel 2 data output bit 4 |
| Chân 16 | D2_5 — Channel 2 data output bit 5 |
| Chân 17 | D2_6 — Channel 2 data output bit 6 |
| Chân 18 | D2_7 — Channel 2 data output bit 7 |
| Chân 19 | D2_8 — Channel 2 data output bit 8 |
| Chân 20 | D2_9 — Channel 2 data output bit 9 |
| Chân 21 | D2_10 — Channel 2 data output bit 10 |
| Chân 22 | D2_11 — Channel 2 data output bit 11 |
| Chân 23 | D2_12 — Channel 2 data output bit 12 |
| Chân 24 | D2_13 — Channel 2 data output bit 13 |
| Chân 25 | D2_14 — Channel 2 data output bit 14 |
| Chân 26 | D2_15 — Channel 2 data output bit 15 (MSB) |
| Chân 27 | OF2 — Channel 2 out-of-range flag |
| Chân 28 | OGND — Output driver ground |
| Chân 29 | OVDD — Output driver supply |
| Chân 30 | GND — Ground |
| Chân 31 | D1_0 — Channel 1 data output bit 0 (LSB) |
| Chân 32 | D1_1 — Channel 1 data output bit 1 |
| Chân 33 | D1_2 — Channel 1 data output bit 2 |
| Chân 34 | D1_3 — Channel 1 data output bit 3 |
| Chân 35 | D1_4 — Channel 1 data output bit 4 |
| Chân 36 | D1_5 — Channel 1 data output bit 5 |
| Chân 37 | D1_6 — Channel 1 data output bit 6 |
| Chân 38 | D1_7 — Channel 1 data output bit 7 |
| Chân 39 | D1_8 — Channel 1 data output bit 8 |
| Chân 40 | D1_9 — Channel 1 data output bit 9 |
| Chân 41 | D1_10 — Channel 1 data output bit 10 |
| Chân 42 | D1_11 — Channel 1 data output bit 11 |
| Chân 43 | D1_12 — Channel 1 data output bit 12 |
| Chân 44 | D1_13 — Channel 1 data output bit 13 |
| Chân 45 | D1_14 — Channel 1 data output bit 14 |
| Chân 46 | D1_15 — Channel 1 data output bit 15 (MSB) |
| Chân 47 | OF1 — Channel 1 out-of-range flag |
| Chân 48 | CLK- — Differential sample clock negative |
| Chân 49 | CLK+ — Differential sample clock positive |
| Chân 50 | GND — Ground |
| Chân 51 | AVDD — 1.8 V analog supply |
| Chân 52 | GND — Ground |
Ứng dụng tiêu biểu
LTC2194CUKG phù hợp cho 6 Áp dụngs: Multi-Carrier Base Station Receiver, Software-Defined Radio (SDR) IF Sampling, Medical Imaging Receiver Chain, Radar and Electronic-Warfare IF Digitizer, Cable Headend Downstream Capture, Test and Measurement Instrumentation.
Multi-Carrier Base Station Receiver
The LTC2194CUKG's two simultaneous-sampling 16-bit 105 Msps channels make it a natural fit for multi-carrier base-station receiver digitizers, where two diversity antennas must be captured in lock-step. With 76.8 dB SNR and 90 dB SFDR at Nyquist plus 0.07 psRMS aperture jitter, the part cleanly resolves multiple LTE or W-CDMA carriers at IF while preserving the EVM required for receiver equalization. Place the ADC downstream of the analog IF filter and front-end LNA/mixer; the dual CMOS output buses feed directly into an FPGA for digital down-conversion and channelization.
Được đề xuất
Software-Defined Radio (SDR) IF Sampling
The ultralow 0.07 psRMS aperture jitter of the LTC2194CUKG makes it well-suited to direct IF undersampling in software-defined radio platforms, where the ADC is clocked well below the analog input center frequency. Combined with 76.8 dB SNR, the part preserves dynamic range across a wide range of IFs, allowing a single analog front end to cover HF, VHF, and lower UHF bands. Use a clean low-jitter clock source such as the AD9516 or a disciplined OCXO, and route the CMOS outputs to an FPGA running the digital down-conversion chain.
Được đề xuất
Medical Imaging Receiver Chain
In ultrasound, PET, and MRI receiver systems, the LTC2194CUKG digitizes the conditioned IF signal from the front-end amplifier with sufficient dynamic range and channel-to-channel matching to support image reconstruction. The two simultaneous-sampling 16-bit channels at 105 Msps capture the full receive aperture per channel with matched phase and gain, while 76.8 dB SNR preserves the low-amplitude echo information critical to image contrast. The 52-QFN (7x8) package fits dense multi-channel board layouts required for high-element-count probes.
Được đề xuất
Radar and Electronic-Warfare IF Digitizer
The 0.07 psRMS aperture jitter and 90 dB SFDR allow the LTC2194CUKG to handle wideband pulsed or LFM radar IF signals without significant SNR penalty from sample-clock uncertainty. Two channels enable simultaneous SUM and DIFF (or main and auxiliary) receiver paths, supporting monopulse angle tracking and direction-finding. Use a low-noise LDO such as the ADP1740 to power the 1.8 V rail and pair the ADC with an FPGA for high-throughput pulse compression.
Được đề xuất
Cable Headend Downstream Capture
Cable headend equipment that captures full downstream QAM or OFDM spectra benefits from the LTC2194CUKG's wide analog input bandwidth and dual 105 Msps channels, allowing two RF segments to be captured simultaneously. The 76.8 dB SNR preserves the modulation-error-ratio of dense QAM constellations, and 90 dB SFDR keeps spurious tones below the noise floor of the carrier stack. The 1.8 V supply simplifies power-rail sharing with the host FPGA.
Được đề xuất
Test and Measurement Instrumentation
Wideband oscilloscopes, spectrum analyzers, and signal analyzers that digitize IF or baseband at 100+ Msps leverage the LTC2194CUKG's low jitter, 16-bit resolution, and dual-channel simultaneous-sampling architecture. Two ADC channels can be used to capture I and Q of a complex signal at 105 Msps, supporting vector signal analysis up to several tens of MHz of bandwidth. The 52-QFN (7x8) package and 1.8 V operation also ease integration into high-channel-density modular instruments.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LTC2194CUKG — 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 | LTC2194IUKG#PBF | LTC2195CUKG#PBF | LTC2193CUKG#PBF | LTC2190CUKG | LTC2191CUKG#PBF |
|---|---|---|---|---|---|---|
| Package | 52-QFN (7x8) | 52-QFN (7x8) - same | 52-QFN (7x8) - same | 52-QFN (7x8) - same | 52-QFN (7x8) - same | 52-QFN (7x8) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Sample Rate | 105 Msps | 105 Msps | 125 Msps | 80 Msps | 25 Msps | 40 Msps |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit |
| Channels | 2 simultaneous | 2 simultaneous | 2 simultaneous | 2 simultaneous | 2 simultaneous | 2 simultaneous |
| SNR (Nyquist) | 76.8 dB | 76.8 dB | 76.8 dB | 76.8 dB | 77 dB (typ) | 77 dB (typ) |
| SFDR | 90 dB | 90 dB | 90 dB | 90 dB | 90 dB | 90 dB |
| Operating Temperature | 0 C to +70 C (C grade) | -40 C to +85 C (I grade) | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C |
| Supply Voltage | 1.8 V | 1.8 V | 1.8 V | 1.8 V | 1.8 V | 1.8 V |
Bảo phân biệt quan trọng
- Higher sample rate than the LTC2191CUKG in the same package (vsLTC2191CUKG#PBF)
- Same 52-QFN (7x8) package and pinout across the entire 25-125 Msps family (vsLTC2190CUKG)
- Wider operating temperature with identical performance (vsLTC2194IUKG#PBF)
Ghi chú thiết kế
Power the 1.8 V AVDD rail with a low-noise LDO such as the ADP1740 placed within 1 cm of the ADC supply pins, and add a 10 microfarad bulk polymer plus a 0.1 microfarad ceramic bypass directly at each AVDD pin. Digital and analog grounds should be joined only at the ADC's exposed thermal pad to prevent digital switching noise from coupling into the analog inputs and degrading the 76.8 dB SNR. Estimated: at 105 Msps the part draws roughly 130 mA per channel (per datasheet typical), so a 1.5W-rated LDO headroom is appropriate.
Route the differential analog inputs (IN1+/IN1-, IN2+/IN2-) as a tightly coupled 100-ohm differential pair on the top layer directly over a continuous ground plane, keeping the pair length matched within 0.5 mm to preserve AC performance. The differential sample clock (CLK+/CLK-) should also be routed as a 100-ohm differential pair with the same length-matching discipline. Use buried vias or skip the analog input layer over the digital outputs to keep digital switching noise out of the analog input return path.
Do not exceed the maximum 2.0 V absolute supply voltage on AVDD or OVDD; even brief transients above this can permanently damage the part. The exposed thermal pad must be soldered to a continuous ground plane with at least 4 thermal vias for the published thermal resistance. If the LVCMOS outputs are not terminated at the receiver FPGA, place 100-ohm series damping resistors near the ADC to limit overshoot; long, unterminated CMOS traces at 105 MHz will corrupt data eyes.
The CMOS output bus generates switching transients that can couple into the analog input if the analog and digital return paths are not isolated. Use a star-ground topology with a single stitch at the exposed pad, and place the output data bus on an inner signal layer sandwiched between two ground planes. Estimated: at 105 Msps the parallel CMOS bus transitions on 32 outputs simultaneously every 9.5 ns, so di/dt-driven ground bounce is a primary cause of degraded SNR in marginal layouts.
Thông tin tuân thủ
RoHS compliance indicated by #PBF suffix per Analog Devices ordering guide. AEC-Q100 not applicable for this commercial-temperature grade.
