LTC2190IUKG - 16-Bit 25Msps Dual ADC | Analog Devices
MPN: LTC2190IUKG ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $28.5 | $28.50 |
| 10 | $25.65 | $256.50 |
| 100 | $22.8 | $2,280.00 |
| 500 | $20.52 | $10,260.00 |
| 1,000 | $18.21 | $18,210.00 |
LTC2190IUKG Overview
A pipelined ADC is a multi-stage converter architecture that performs a coarse quantization in early stages and a fine resolution in later stages, enabling high sampling rates with moderate latency. Pipelined ADCs sit within the broader hierarchy of analog-to-digital converter architectures: they occupy the middle ground between successive-approximation (SAR) ADCs, which offer low power but lower speeds, and flash ADCs, which offer the highest speeds at much lower resolution and far higher power. The pipelined architecture makes the LTC2190 ideal for communications receivers, IF digitization, and multi-channel data-acquisition systems where 16-bit resolution and 25 Msps speed must coexist with low power.
The LTC2190IUKG features 2 fully differential input channels, each with its own sample-and-hold, allowing simultaneous capture of two analog signals. An internal high-precision bandgap reference and reference buffer simplify external component count, while a flexible LVDS/CMOS-compatible data output interface and SPI-compatible serial programming port allow per-channel gain and offset calibration, output format selection, and power-down modes. Industrial temperature grade (-40C to +85C) operation is supported, with optional extended-grade variants for harsher environments.
In typical communications and instrumentation designs, the LTC2190IUKG is used in the IF signal path of multi-carrier wireless base stations, in medical ultrasound beamformers, in radar and LiDAR front-ends, and in high-channel-count portable oscilloscopes and spectrum analyzers. The 52-QFN (7x8 mm) package provides a compact footprint with an exposed thermal pad, enabling PCB designs that stack two ADCs on a single board while keeping the thermal path within safe limits.
When designing with the LTC2190IUKG, the most important considerations are differential input drive (a balun or ADC driver is normally required), PCB layout of the analog and digital grounds, and proper decoupling of the internal reference and supply pins. Following Analog Devices' reference-layout guidance in the datasheet typical-application section is strongly recommended to achieve the published 77 dB SNR.
This page synthesizes distributor pricing, drop-in alternatives (LTC2180CUP, LTC2184IUP, LTC2156IUP-14, and others), and practical design notes not assembled in any single source - including same-package comparison data and cross-brand reference points that help engineers evaluate board-level alternatives.
Drop-in alternatives for LTC2190IUKG — 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 LTC2190IUKG (same form factor and footprint) — differing in Package, Sample Rate, SNR, Operating Temperature Range, SFDR.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC2191IUKG
✅ Drop-In✓ In Stock
$62.95 / Unit
View Datasheet →LTC2192IUKG
✅ Drop-In✓ In Stock
$63.56 / Unit
View Datasheet →LTC2190IUKG Maximum Ratings & Electrical Characteristics
| Resolution | 16 bit |
| Number of Channels | 2 (simultaneous sampling) |
| Sampling Rate | 25 Msps per channel |
| Architecture | Pipelined |
| Input Type | Differential |
| SNR | 77 dB |
| SFDR | 90 dB |
| Number of Inputs | 2 |
| Package | 52-QFN (7x8 mm) with exposed pad |
| Package Code | HVQCCN (QFN EP) |
| Mounting Type | Surface Mount |
| Temperature Grade | Industrial |
| Operating Temperature | -40C to +85C |
| Data Interface | LVDS/CMOS parallel, SPI configuration port |
| RoHS Status | Compliant (PBF suffix) |
| Pin Count | 52 |
| Lead Free | Yes |
LTC2190IUKG hvqccn (qfn ep) Pin Configuration Guide
Pin configuration for LTC2190IUKG (hvqccn (qfn ep) package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for LTC2190IUKG.
Refer to the datasheet for full pin configuration.
Typical Applications
LTC2190IUKG is suitable for 6 applications: Multi-Carrier Communications Receiver IF Digitization, Portable / Handheld Spectrum Analyzer Front-End, Medical Ultrasound Beamforming Receiver, Radar and LiDAR Pulse Digitization, Industrial Data Acquisition System (DAQ), Test and Measurement Instrumentation.
Multi-Carrier Communications Receiver IF Digitization
The LTC2190IUKG's 77 dB SNR and 90 dB SFDR make it well matched to multi-carrier wireless base-station IF chains that must resolve weak signals in the presence of strong interferers. The dual simultaneous-sampling 25 Msps channels allow I/Q digitization of a single IF or two independent IF bands without analog Hilbert-mixer networks, simplifying the analog front-end. The 52-QFN (7x8) footprint enables a compact receiver PCB, and the 1.8V/3.3V analog supply operation keeps power consumption modest enough for densely populated base-station line cards. The pipelined architecture also delivers low conversion latency (about 5 clock cycles) suitable for closed-loop or adaptive digital pre-distortion feedback paths.
Recommended
Portable / Handheld Spectrum Analyzer Front-End
The 25 Msps sampling rate of the LTC2190IUKG captures up to 12.5 MHz of instantaneous bandwidth, which covers many portable spectrum-analyzer use cases in EMC pre-compliance testing, RF education, and field service work. Its two simultaneous-sampling channels support direct sampling of two antenna ports for a simple TDD or direction-finding receiver. The low per-channel power consumption and 52-QFN (7x8) exposed-pad package enable a compact handheld form factor, while the 16-bit resolution gives the dynamic range needed to see small spurs near large signals. The on-chip reference and SPI calibration port simplify the bill of materials and let the instrument firmware apply per-unit gain/offset correction at the factory.
Recommended
Medical Ultrasound Beamforming Receiver
The LTC2190IUKG's two simultaneous-sampling 16-bit channels are a natural fit for low-channel-count ultrasound front-end boards, where many parallel ADCs are tiled to form the receive aperture. The pipelined architecture offers low conversion latency, important for phased-array beamforming that depends on consistent timing across channels. At 77 dB SNR, the part captures the dynamic range of reflected ultrasound echoes down to centimeter depths, while 90 dB SFDR keeps harmonic distortion from tissue-contrast imaging artifacts out of the displayed image. The 52-QFN (7x8) footprint packs two ADCs into a small area, and the industrial temperature range supports portable-cart and bedside-cart use cases.
Recommended
Radar and LiDAR Pulse Digitization
For short-range industrial radar and LiDAR receiver channels, the LTC2190IUKG provides the 16-bit dynamic range needed to capture both strong near-range returns and weak far-range returns in the same data record. The 25 Msps sampling rate covers pulse-Doppler and FMCW chirp bandwidths typical of short-range automotive and industrial sensors. Two simultaneous-sampling channels allow the part to digitize both the I and Q baseband outputs of a single radar mixer, halving the board-area needed for the receive chain. The exposed-pad QFN package provides good thermal performance for the continuous-conversion duty cycles typical of these applications.
Recommended
Industrial Data Acquisition System (DAQ)
The LTC2190IUKG's two simultaneous 16-bit channels at 25 Msps are a good match for industrial DAQ modules that sample multiple sensor channels with phase coherence, such as vibration analyzers, power-quality monitors, and three-phase power-meter ICs that need two channels per phase. The 77 dB SNR gives enough headroom to digitize signals directly from 4-20 mA or voltage-output sensors with on-board gain. The LVDS/CMOS-selectable output mode and SPI configuration port let the part integrate cleanly with both FPGAs and microcontrollers. The industrial -40C to +85C temperature grade and lead-free QFN package make the part suitable for factory-floor deployment.
Recommended
Test and Measurement Instrumentation
In benchtop oscilloscopes, transient recorders, and protocol analyzers, the LTC2190IUKG serves as a dual-channel front-end ADC where moderate bandwidth and high dynamic range matter more than maximum sample rate. The 16-bit resolution captures small signal details that 12/14-bit parts miss, and the dual simultaneous channels support two-channel scope operation or trigger/sync capture modes. The part is well documented in the Analog Devices reference design library, and the SPI configuration port lets the instrument firmware adjust gain and offset at runtime. The 52-QFN (7x8) footprint simplifies mechanical integration into compact 1U and modular instrument chassis.
Recommended
Recommended Products Summary
Engineering reference data for LTC2190IUKG — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC2191IUKG | LTC2192IUKG |
|---|---|---|---|
| Package | 52-QFN (7x8) | 52-QFN (7x8) - same | 52-QFN (7x8) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 16 bit | 16 bit | 16 bit |
| Sampling Rate | 25 Msps | 40 Msps | 65 Msps |
| Channels | 2 simultaneous | 2 simultaneous | 2 simultaneous |
| SNR | 77 dB | 76.3 dB | 76 dB |
| SFDR | 90 dB | 90 dB | 90 dB |
| Architecture | Pipelined | Pipelined | Pipelined |
| Industrial Temp Grade | Yes (-40C to +85C) | Yes (-40C to +85C) | Yes (-40C to +85C) |
Key Differentiators
- Drop-in upgrade path to higher sample rates within the same family (vs LTC2191IUKG / LTC2192IUKG)
- Lowest-power member of the 52-QFN dual-ADC family (vs LTC2192IUKG (65 Msps))
- Higher dynamic range at the same sample rate than 14-bit alternatives (vs LTC2156IUP-14 (14-bit, 65 Msps, 64-QFN))
Design Notes
Use a single solid ground plane under the LTC2190IUKG, but split analog and digital ground regions only at the ADC's GND pins and the exposed thermal pad. The exposed pad is the primary electrical and thermal ground; solder it to a large copper pour with multiple stitching vias to the inner ground plane. Place the input coupling capacitors within 2-3 mm of the INA+/INA- and INB+/INB- pins to minimize parasitic inductance. Keep the LVDS/CMOS data output traces short and length-matched to avoid inter-channel skew on the digital bus.
Decouple each analog supply pin with a 0.1 uF X7R ceramic capacitor placed within 2 mm of the pin, and bulk-decouple with a 10 uF ceramic or low-ESR tantalum on the same supply net. Add a ferrite bead between the analog and digital 1.8V supply rails to prevent digital switching noise from coupling into the analog sections. Per the datasheet, the LTC2190IUKG requires clean low-noise supplies; do not share the analog ADC supply directly with high-current switching regulators without filtering.
Drive each differential input with a low-noise differential driver such as the AD8138 or ADL5562 to realize the 77 dB SNR specification. The LTC2190IUKG is designed for differential inputs; single-ended operation degrades SFDR and SNR. Use a balun with 1:1 impedance ratio for narrow-band IF applications. Place a common-mode bias network at the driver output to set the input common-mode voltage to the ADC's required level, typically 0.9V for 1.8V analog supply operation.
Do not skip the input RC anti-alias filter - the LTC2190IUKG's wideband sample-and-hold will alias out-of-band noise directly into the conversion result. Use a passive RC low-pass with cutoff at approximately 0.4 x Fs/2 placed between the driver and the ADC inputs. Do not connect the internal reference output (REFOUT) directly to the reference input (REFIN) without the recommended reference buffer capacitor. Finally, ensure the ENC+ and ENC- clock inputs are driven with low-jitter, low-phase-noise signals: SNR degrades ~3 dB per 1 ps of added clock jitter at the maximum input frequency.
Compliance Information
RoHS and REACH compliance confirmed by the #PBF ordering suffix (lead-free lead finish). Not AEC-Q100 qualified - this part targets communications, instrumentation, and industrial markets, not automotive. Halogen-free status not stated explicitly in the provided web data.
