LTC2194CUKG - 16-Bit 105Msps Dual ADC, 52-QFN | Analog Devices
MPN: LTC2194CUKG ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $36.5 | $36.50 |
| 10 | $32.1 | $321.00 |
| 100 | $28.75 | $2,875.00 |
| 500 | $25.4 | $12,700.00 |
| 1,000 | $22.95 | $22,950.00 |
LTC2194CUKG Overview
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.
Drop-in alternatives for LTC2194CUKG — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LTC2194CUKG (same form factor and footprint) — differing in Operating Temperature Range, RoHS Status, Aperture Jitter, Input Type, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC2194IUKG#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2195CUKG#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2193CUKG#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2190CUKG
✅ Drop-In✓ In Stock
$64 / Unit
View Datasheet →LTC2191CUKG#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2194CUKG Maximum Ratings & Electrical Characteristics
| Resolution | 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 |
| Supply Voltage | 1.8 V |
| Output Interface | Parallel LVCMOS |
| Package | 52-QFN (7x8 mm) with exposed pad |
| Mounting Type | Surface Mount |
| Operating Temperature Range | 0 C to +70 C (C grade) |
| MSL Level | 3 |
| RoHS Status | Compliant (#PBF suffix) |
| Lead-Free | Yes |
LTC2194CUKG Pin Configuration
| Pin 1 | GND — Ground |
| Pin 2 | IN1+ — Channel 1 differential analog input positive |
| Pin 3 | IN1- — Channel 1 differential analog input negative |
| Pin 4 | GND — Ground |
| Pin 5 | IN2+ — Channel 2 differential analog input positive |
| Pin 6 | IN2- — Channel 2 differential analog input negative |
| Pin 7 | GND — Ground |
| Pin 8 | VREF — Voltage reference bypass |
| Pin 9 | GND — Ground |
| Pin 10 | OGND — Output driver ground |
| Pin 11 | D2_0 — Channel 2 data output bit 0 (LSB) |
| Pin 12 | D2_1 — Channel 2 data output bit 1 |
| Pin 13 | D2_2 — Channel 2 data output bit 2 |
| Pin 14 | D2_3 — Channel 2 data output bit 3 |
| Pin 15 | D2_4 — Channel 2 data output bit 4 |
| Pin 16 | D2_5 — Channel 2 data output bit 5 |
| Pin 17 | D2_6 — Channel 2 data output bit 6 |
| Pin 18 | D2_7 — Channel 2 data output bit 7 |
| Pin 19 | D2_8 — Channel 2 data output bit 8 |
| Pin 20 | D2_9 — Channel 2 data output bit 9 |
| Pin 21 | D2_10 — Channel 2 data output bit 10 |
| Pin 22 | D2_11 — Channel 2 data output bit 11 |
| Pin 23 | D2_12 — Channel 2 data output bit 12 |
| Pin 24 | D2_13 — Channel 2 data output bit 13 |
| Pin 25 | D2_14 — Channel 2 data output bit 14 |
| Pin 26 | D2_15 — Channel 2 data output bit 15 (MSB) |
| Pin 27 | OF2 — Channel 2 out-of-range flag |
| Pin 28 | OGND — Output driver ground |
| Pin 29 | OVDD — Output driver supply |
| Pin 30 | GND — Ground |
| Pin 31 | D1_0 — Channel 1 data output bit 0 (LSB) |
| Pin 32 | D1_1 — Channel 1 data output bit 1 |
| Pin 33 | D1_2 — Channel 1 data output bit 2 |
| Pin 34 | D1_3 — Channel 1 data output bit 3 |
| Pin 35 | D1_4 — Channel 1 data output bit 4 |
| Pin 36 | D1_5 — Channel 1 data output bit 5 |
| Pin 37 | D1_6 — Channel 1 data output bit 6 |
| Pin 38 | D1_7 — Channel 1 data output bit 7 |
| Pin 39 | D1_8 — Channel 1 data output bit 8 |
| Pin 40 | D1_9 — Channel 1 data output bit 9 |
| Pin 41 | D1_10 — Channel 1 data output bit 10 |
| Pin 42 | D1_11 — Channel 1 data output bit 11 |
| Pin 43 | D1_12 — Channel 1 data output bit 12 |
| Pin 44 | D1_13 — Channel 1 data output bit 13 |
| Pin 45 | D1_14 — Channel 1 data output bit 14 |
| Pin 46 | D1_15 — Channel 1 data output bit 15 (MSB) |
| Pin 47 | OF1 — Channel 1 out-of-range flag |
| Pin 48 | CLK- — Differential sample clock negative |
| Pin 49 | CLK+ — Differential sample clock positive |
| Pin 50 | GND — Ground |
| Pin 51 | AVDD — 1.8 V analog supply |
| Pin 52 | GND — Ground |
Typical Applications
LTC2194CUKG is suitable for 6 applications: 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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
Recommended Products Summary
Engineering reference data for LTC2194CUKG — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 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 |
Key Differentiators
- Higher sample rate than the LTC2191CUKG in the same package (vs LTC2191CUKG#PBF)
- Same 52-QFN (7x8) package and pinout across the entire 25-125 Msps family (vs LTC2190CUKG)
- Wider operating temperature with identical performance (vs LTC2194IUKG#PBF)
Design Notes
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.
Compliance Information
RoHS compliance indicated by #PBF suffix per Analog Devices ordering guide. AEC-Q100 not applicable for this commercial-temperature grade.
