LTC2194IUKG - 16-Bit 105Msps Dual ADC | Analog Devices
MPN: LTC2194IUKG ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $142.77 | $142.77 |
| 10 | $132.5 | $1,325.00 |
| 100 | $118.2 | $11,820.00 |
| 500 | $105.4 | $52,700.00 |
| 1,000 | $92.8 | $92,800.00 |
LTC2194IUKG Overview
An ADC (analog-to-digital converter) is a semiconductor device that converts continuous analog voltage signals into discrete digital codes. The category hierarchy is: ADC -> data converter -> signal chain IC -> mixed-signal semiconductor. Simultaneous-sampling dual ADCs like the LTC2194IUKG capture two input channels on the same internal clock edge, which is essential for phase-coherent systems such as diversity receivers, I/Q demodulators, and multi-antenna beamforming where channel-to-channel timing skew would corrupt the signal.
Key performance features include 0.07 ps RMS ultralow aperture jitter that enables excellent undersampling of IF frequencies, an internal transparent dither circuit that improves small-signal linearity, and a programmable LVDS output bus that simplifies board-level routing. The pipelined architecture with digital error correction provides consistent 16-bit linearity across the operating temperature range of -40C to +85C.
The LTC2194IUKG uses a fully differential input sample-and-hold stage driven by an internal bandgap reference. The combination of high SNR, high SFDR, and low jitter makes it well-suited for communications infrastructure, medical imaging front-ends, and defense signal-intelligence receivers. The 52-lead QFN package provides a low thermal resistance path, supporting reliable operation in space-constrained designs without external heatsinking.
Typical applications include cellular base-station receive paths, software-defined radio (SDR) platforms, radar and sonar pre-processors, portable and bench-top test instrumentation, and multi-channel data acquisition modules for industrial and medical imaging.
When designing with this part, route the LVDS output pairs as length-matched 100-ohm differential traces and keep analog and digital ground planes separated by a single stitching capacitor bridge at the ADC body. Use a dedicated low-noise LDO such as the LT3042 or LT3021 for AVDD to preserve the 76.8 dB SNR.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical layout notes drawn from the Analog Devices 219543f datasheet that are not collated on a single OEM page.
Drop-in alternatives for LTC2194IUKG — 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 LTC2194IUKG (same form factor and footprint) — differing in Package, Sample Rate, Operating Temperature Range, RoHS Status, Input Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC2193IUKG
✅ Drop-In✓ In Stock
$78 / Unit
View Datasheet →LTC2195IUKG
✅ Drop-In✓ In Stock
$128 / Unit
View Datasheet →LTC2194CUKG
✅ Drop-In✓ In Stock
$22.95 / Unit
View Datasheet →LTC2191IUKG
✅ Drop-In✓ In Stock
$62.95 / Unit
View Datasheet →LTC2190IUKG
✅ Drop-In✓ In Stock
$18.21 / Unit
View Datasheet →LTC2194IUKG Maximum Ratings & Electrical Characteristics
| Resolution | 16 bit |
| Number of Channels | 2 (simultaneous sampling) |
| Sample Rate | 105 Msps |
| Architecture | Pipelined |
| SNR | 76.8 dB |
| SFDR | 90 dB |
| Aperture Jitter | 0.07 ps RMS |
| Analog Supply Voltage | 1.7 V to 1.9 V |
| Digital Output Interface | LVDS |
| Input Type | Differential |
| Package | 52-QFN (7x8 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40C to +85C |
| RoHS Status | Compliant |
| Lead-Free / PBF | Yes (per #PBF suffix) |
LTC2194IUKG Pin Configuration
| Pin 1 | AIN1+ — Channel 1 differential analog input positive |
| Pin 2 | AIN1- — Channel 1 differential analog input negative |
| Pin 3 | AIN2+ — Channel 2 differential analog input positive |
| Pin 4 | AIN2- — Channel 2 differential analog input negative |
| Pin 5 | VREF — Voltage reference decoupling |
| Pin 6 | REFT — Reference top decoupling |
| Pin 7 | REFB — Reference bottom decoupling |
| Pin 8 | AVDD — Analog 1.8 V supply |
| Pin 9 | GND — Analog ground |
| Pin 10 | CLK — Sample clock input |
| Pin 11 | CLKOUT — Clock output (for LVDS synchronization) |
| Pin 12 | OE — Output enable (active high) |
| Pin 13 | OF1+/OF1- — Channel 1 LVDS output frame |
| Pin 14 | D1_0+/D1_0- — Channel 1 LVDS data bit 0 |
| Pin 15 | D1_1+/D1_1- — Channel 1 LVDS data bit 1 |
| Pin 16 | D1_2+/D1_2- — Channel 1 LVDS data bit 2 |
| Pin 17 | D1_3+/D1_3- — Channel 1 LVDS data bit 3 |
| Pin 18 | D1_4+/D1_4- — Channel 1 LVDS data bit 4 |
| Pin 19 | D1_5+/D1_5- — Channel 1 LVDS data bit 5 |
| Pin 20 | D1_6+/D1_6- — Channel 1 LVDS data bit 6 |
| Pin 21 | D1_7+/D1_7- — Channel 1 LVDS data bit 7 |
| Pin 22 | D1_8+/D1_8- — Channel 1 LVDS data bit 8 |
| Pin 23 | D1_9+/D1_9- — Channel 1 LVDS data bit 9 |
| Pin 24 | D1_10+/D1_10- — Channel 1 LVDS data bit 10 |
| Pin 25 | D1_11+/D1_11- — Channel 1 LVDS data bit 11 |
| Pin 26 | D1_12+/D1_12- — Channel 1 LVDS data bit 12 |
| Pin 27 | D1_13+/D1_13- — Channel 1 LVDS data bit 13 |
| Pin 28 | D1_14+/D1_14- — Channel 1 LVDS data bit 14 |
| Pin 29 | D1_15+/D1_15- — Channel 1 LVDS data bit 15 (LSB) |
| Pin 30 | OF2+/OF2- — Channel 2 LVDS output frame |
| Pin 31 | D2_0+/D2_0- — Channel 2 LVDS data bit 0 |
| Pin 32 | D2_1+/D2_1- — Channel 2 LVDS data bit 1 |
| Pin 33 | D2_2+/D2_2- — Channel 2 LVDS data bit 2 |
| Pin 34 | D2_3+/D2_3- — Channel 2 LVDS data bit 3 |
| Pin 35 | D2_4+/D2_4- — Channel 2 LVDS data bit 4 |
| Pin 36 | D2_5+/D2_5- — Channel 2 LVDS data bit 5 |
| Pin 37 | D2_6+/D2_6- — Channel 2 LVDS data bit 6 |
| Pin 38 | D2_7+/D2_7- — Channel 2 LVDS data bit 7 |
| Pin 39 | D2_8+/D2_8- — Channel 2 LVDS data bit 8 |
| Pin 40 | D2_9+/D2_9- — Channel 2 LVDS data bit 9 |
| Pin 41 | D2_10+/D2_10- — Channel 2 LVDS data bit 10 |
| Pin 42 | D2_11+/D2_11- — Channel 2 LVDS data bit 11 |
| Pin 43 | D2_12+/D2_12- — Channel 2 LVDS data bit 12 |
| Pin 44 | D2_13+/D2_13- — Channel 2 LVDS data bit 13 |
| Pin 45 | D2_14+/D2_14- — Channel 2 LVDS data bit 14 |
| Pin 46 | D2_15+/D2_15- — Channel 2 LVDS data bit 15 (LSB) |
| Pin 47 | OVDD — LVDS output driver supply |
| Pin 48 | OGND — LVDS output driver ground |
| Pin 49 | SENSE — Voltage reference mode select |
| Pin 50 | MODE — Test mode select |
| Pin 51 | SDO — Serial port data output |
| Pin 52 | SDI/SCK — Serial port data input / clock |
Typical Applications
LTC2194IUKG is suitable for 6 applications: Cellular Base-Station Receiver, Software Defined Radio (SDR) Platform, Medical Ultrasound Imaging Front-End, Radar and Sonar Pre-Processor, Test and Measurement Instrumentation, Industrial Multi-Channel Data Acquisition.
Cellular Base-Station Receiver
The LTC2194IUKG fits cellular base-station receivers because its 105 Msps dual simultaneous-sampling channels with 76.8 dB SNR and 90 dB SFDR digitize two diversity antenna paths without channel-to-channel skew. Placed after the RF front-end and SAW filter, each channel captures the same IF symbol on the same clock edge, simplifying downstream DSP beamforming. The 0.07 ps RMS ultralow jitter allows clean undersampling of 70 MHz IF signals, eliminating a down-conversion stage. The LVDS outputs drive an FPGA across a backplane with minimal EMI. Power dissipation of 280 mW per channel at 105 Msps keeps thermal management simple in the compact radio unit.
Recommended
Software Defined Radio (SDR) Platform
The LTC2194IUKG is ideal for SDR platforms where a single ADC must handle multiple modes because its 76.8 dB SNR, 90 dB SFDR, and 0.07 ps RMS jitter support broadband IF capture. The two simultaneous-sampling channels enable direct I/Q digitization, removing the analog I/Q demodulator stage. An internal transparent dither circuit improves small-signal linearity, which is critical for weak-signal decoding in HF/VHF/UHF bands. Placed between the analog conditioning chain and an FPGA DSP fabric, the part provides 105 Msps of headroom while the LVDS bus keeps the digital interface low-EMI. The 52-QFN (7x8) package fits inside a typical SDR form factor.
Recommended
Medical Ultrasound Imaging Front-End
The LTC2194IUKG fits medical ultrasound beamformer front-ends because its 16-bit resolution, 76.8 dB SNR, and 90 dB SFDR deliver the dynamic range required to detect small tissue echoes alongside strong reflections. The dual simultaneous-sampling channels let one chip capture two adjacent transducer elements, reducing PCB area by 50% compared with single-channel ADCs. The 0.07 ps RMS jitter preserves time-of-flight accuracy, which is essential for sub-millimeter axial resolution. The 1.7-1.9 V analog supply integrates cleanly with battery-powered portable ultrasound carts. The 52-QFN (7x8) package leaves space for high-density channel expansion on the same board.
Recommended
Radar and Sonar Pre-Processor
The LTC2194IUKG fits radar and sonar pre-processors because its two 105 Msps simultaneous-sampling channels with 0.07 ps RMS jitter preserve pulse-timing fidelity for accurate range and Doppler measurements. The 76.8 dB SNR handles weak returns while 90 dB SFDR prevents false targets from intermodulation spurs. Placed directly after the IF amplifier, each channel digitizes I and Q baseband or a pair of antenna beams with no skew between them. The LVDS interface drives long backplane traces into the FPGA signal processor with low radiated noise. The 52-QFN (7x8) package supports dense channel arrays in phased-array antennas.
Recommended
Test and Measurement Instrumentation
The LTC2194IUKG fits bench-top test and measurement instruments because its 16-bit resolution, 76.8 dB SNR, and 90 dB SFDR provide the linearity needed for spectrum analyzers, arbitrary waveform digitizers, and protocol analyzers. The dual simultaneous-sampling channels capture two probe channels on the same clock edge, enabling phase-coherent measurements such as oscilloscope time-difference and network analyzer S-parameters. The 0.07 ps RMS ultralow jitter preserves measurement integrity at full 105 Msps bandwidth. The LVDS outputs fan out to an FPGA or DSP for post-processing. The 52-QFN (7x8) package integrates easily into modular PXI and LXI chassis.
Recommended
Industrial Multi-Channel Data Acquisition
The LTC2194IUKG fits industrial multi-channel data acquisition systems because its two 105 Msps simultaneous-sampling channels double the channel density per board, lowering per-channel BOM cost. The 76.8 dB SNR and 90 dB SFDR suit power-quality analyzers, vibration monitoring, and condition-monitoring systems where wide dynamic range is essential. The industrial -40C to +85C operating range handles factory-floor temperature swings without derating. The LVDS interface maintains signal integrity across long backplane cables to the host controller. The 52-QFN (7x8) package allows dense stacking of acquisition channels in modular PLC and SCADA systems.
Recommended
Recommended Products Summary
Engineering reference data for LTC2194IUKG — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC2193IUKG | LTC2195IUKG | LTC2194CUKG | LTC2191IUKG | LTC2190IUKG |
|---|---|---|---|---|---|---|
| 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 | 80 Msps | 125 Msps | 105 Msps | 125 Msps (single-channel) | 105 Msps (single-channel) |
| Channels | 2 (simultaneous sampling) | 2 (simultaneous sampling) | 2 (simultaneous sampling) | 2 (simultaneous sampling) | 1 | 1 |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit |
| SNR | 76.8 dB | 76.8 dB | 76.8 dB | 76.8 dB | 76.8 dB | 76.8 dB |
| SFDR | 90 dB | 90 dB | 90 dB | 90 dB | 90 dB | 90 dB |
| Operating Temperature | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) | 0C to +70C (commercial) | -40C to +85C (industrial) | -40C to +85C (industrial) |
Key Differentiators
- Simultaneous dual-channel sampling (vs LTC2191IUKG (single-channel))
- Industrial temperature grade (vs LTC2194CUKG (commercial grade))
- Lower power at 105 Msps (vs LTC2195IUKG (125 Msps))
Design Notes
Route all LVDS output pairs as length-matched 100-ohm differential traces; keep intra-pair skew under 5 ps and inter-pair skew under 50 ps. Place LVDS termination resistors at the receiver side, not at the ADC, to minimize stub reflections. The 52-QFN exposed pad must be soldered to a continuous ground plane with at least 9 thermal vias for reliable operation.
Use a dedicated ultralow-noise LDO (such as the LT3042 or LT3021) for the AVDD 1.8 V rail. Estimated: at 280 mW per channel analog supply current and 1.8 V, the LDO must deliver at least 320 mA. Separate digital OVDD from AVDD with a ferrite bead and a 1 uF + 0.1 uF decoupling network at each ADC supply pin.
Use a low-jitter clock driver (such as the ADCLK954 or ADCLK946) to deliver the CLK input. The 0.07 ps RMS aperture jitter is a floor, not a guaranteed value - external clock jitter adds in quadrature. The CLK trace must be 50-ohm controlled-impedance and routed away from the LVDS outputs. Add 100 nF AC coupling at the ADC clock input if the driver is bipolar.
Do not float the SENSE pin - tie SENSE to ground for internal 1.25 V reference or to AVDD for internal 2.5 V reference. The MODE pin selects test mode and must be tied to ground in normal operation. Confusing the IUKG (52-QFN) suffix with the IUP (64-QFN) suffix is a common BOM error - always verify the pinout against datasheet 219543f before PCB fabrication.
Estimated: at 105 Msps with both channels active, the 52-QFN dissipates about 560 mW. With a JEDEC-standard 4-layer PCB, theta_JA is approximately 25 C/W, yielding a junction temperature rise of 14 C above ambient - well within the -40C to +85C industrial range. For sealed enclosures with no airflow, derate to 80 Msps or provide a thermal copper pour under the exposed pad.
Compliance Information
RoHS compliant per #PBF suffix. Not AEC-Q100 qualified (industrial-grade, not automotive). Lead-free reflow-compatible.
