LTC2151CUJ-14 - 14-Bit 210Msps ADC, DDR LVDS, 40-QFN | ADI
MPN: LTC2151CUJ-14 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $41.5 | $41.50 |
| 10 | $39.2 | $392.00 |
| 100 | $35.8 | $3,580.00 |
| 500 | $32.4 | $16,200.00 |
| 1,000 | $29.1 | $29,100.00 |
LTC2151CUJ-14 Overview
An ADC (analog-to-digital converter) is a semiconductor that samples continuous analog voltages and converts them into discrete digital codes for downstream DSP, FPGA, or processor-based signal chains. Pipeline ADCs like the LTC2151-14 achieve a balance between high sampling rate, moderate resolution, and low latency - here, only five clock cycles - making them ideal for multi-carrier base stations, broadband digital pre-distortion, and software-defined radio. Within the broader taxonomy, this part is a high-speed ADC -> data converter -> signal chain IC -> mixed-signal semiconductor.
Key specifications include +/-0.85 LSB INL (typical), +/-0.25 LSB DNL (typical), no missing codes over temperature, and 1.82 LSB RMS transition noise. The digital outputs are double-data-rate (DDR) LVDS, simplifying FPGA capture at full speed. The ENC+ and ENC- encode inputs accept differential sine wave, PECL, LVDS, TTL, or CMOS drive, and an optional clock duty-cycle stabilizer (DCS) maintains SNR across non-50% duty-cycle clock sources.
Architecturally, the LTC2151-14 uses a multi-stage pipelined switched-capacitor core stabilized by an internal bandgap reference. The differential analog input pair is designed to be driven through a transformer or differential amplifier for best second-order distortion performance; a 1.25 GHz analog front-end allows IF sampling well above Nyquist. The DDR LVDS interface reduces the output pin count and eases FPGA I/O timing closure at hundreds of MHz.
Typical applications include cellular base-station receivers, cable and broadband digital pre-distortion (DPD) feedback paths, test and measurement instrumentation, radar and LIDAR signal acquisition, and software-defined radios. The combination of wide input bandwidth and high SFDR suits multi-carrier GSM/WCDMA/LTE systems where adjacent carriers must remain distinguishable.
Designers should pay particular attention to analog input network design - a 1:1 transformer or differential driver is recommended to realize the full 90 dB SFDR - and to FPGA LVDS capture timing because DDR mode halves the available timing budget. Place the part on a low-noise analog supply layer with decoupling close to each supply pin.
This page synthesizes distributor stock, pricing, and pin-compatible drop-in alternatives (LTC2150CUJ-14 in the same family, plus competitor equivalents) alongside practical design considerations not duplicated in the manufacturer datasheet.
Drop-in alternatives for LTC2151CUJ-14 — 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 LTC2151CUJ-14 (same form factor and footprint) — differing in Package, Sample Rate, Resolution, Number of Channels, Operating Temperature Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC2150CUJ-14
✅ Drop-In✓ In Stock
$41.58 / Unit
View Datasheet →LTC2152CUJ-14
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2151IUJ-14
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTC2151CUJ-14 Maximum Ratings & Electrical Characteristics
| Resolution | 14 bits |
| Sample Rate | 210 Msps |
| Architecture | Pipelined, 5-cycle latency |
| Number of Input Channels | 1 differential |
| Input Bandwidth | 1.25 GHz |
| SNR (typical) | 70 dB |
| SFDR (typical) | 90 dB |
| INL (typical) | +/-0.85 LSB |
| DNL (typical) | +/-0.25 LSB |
| Transition Noise | 1.82 LSB RMS |
| Missing Codes | None over temperature |
| Digital Output Interface | DDR LVDS |
| Encode Input Compatibility | Differential sine, PECL, LVDS, TTL, CMOS |
| Clock Duty-Cycle Stabilizer | Yes (optional) |
| Package | 40-QFN (6x6 mm) exposed pad |
| Mounting Type | Surface Mount |
| Operating Temperature Grade | Commercial |
| Lead Free / RoHS | Yes (Pb-free #PBF suffix) |
LTC2151CUJ-14 40-qfn (6x6 mm) exposed pad Pin Configuration Guide
Pin configuration for LTC2151CUJ-14 (40-qfn (6x6 mm) exposed pad 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 LTC2151CUJ-14.
Refer to the datasheet for full pin configuration.
Typical Applications
LTC2151CUJ-14 is suitable for 6 applications: Cellular Base Station Receiver, Digital Pre-Distortion (DPD) Feedback Path, Test and Measurement Instrumentation, Radar and LIDAR Signal Acquisition, Software-Defined Radio (SDR) Platform, Medical Imaging Receiver.
Cellular Base Station Receiver
The LTC2151CUJ-14 fits cellular base-station receiver designs with 70 dB SNR and 90 dB SFDR, which are necessary to separate adjacent carriers and reject strong interferers in multi-carrier GSM/WCDMA/LTE channels. The 1.25 GHz input bandwidth allows direct IF sampling at intermediate frequencies commonly used in superheterodyne macro cells, eliminating a down-mixer stage. Mounted between an RF SAW filter bank and an FPGA baseband processor, the ADC runs at 210 Msps with DDR LVDS feeding the FPGA transceiver banks. Designers must use a differential transformer or driver on the analog inputs to achieve the full 90 dB SFDR with multi-carrier LTE signals.
Recommended
Digital Pre-Distortion (DPD) Feedback Path
In DPD loops for power amplifier linearization, the feedback ADC must capture 3rd- and 5th-order distortion products while preserving dynamic range. The LTC2151CUJ-14 provides 90 dB SFDR and 1.25 GHz input bandwidth, allowing direct sampling of the PA output coupler path without external mixers. Placed inside the feedback chain, the ADC's DDR LVDS outputs reduce FPGA pin pressure on the digital-predistortion engine. The pipelined architecture's five-clock latency is acceptable because DPD paths operate at baseband rate and tolerate microseconds of delay provided sample timing is consistent.
Recommended
Test and Measurement Instrumentation
Test equipment such as oscilloscope input stages, signal analyzers, and ATE digitizers benefit from the LTC2151CUJ-14's pipelined architecture and 14-bit resolution. The 1.25 GHz analog input bandwidth plus 70 dB SNR enables capture of high-frequency communications test signals with accurate amplitude fidelity. The DDR LVDS outputs feed FPGA capture RAM or ASIC DSP blocks at the full 210 Msps rate, supporting long-record acquisitions through downstream memory. The 40-QFN footprint is dense enough for multi-channel oscilloscope mezzanines but exposed-pad-compatible with standard four-layer FR-4 designs.
Recommended
Radar and LIDAR Signal Acquisition
Radar pulsed-Doppler, LIDAR time-of-flight, and phased-array receivers use the LTC2151CUJ-14 because of its wide 1.25 GHz input bandwidth, allowing IF sampling of L-band and S-band radar returns with high dynamic range. The 90 dB SFDR preserves weak echoes next to strong clutter returns; the 1.82 LSB RMS transition noise sets a clean noise floor for low-observable targets. Five-clock latency is acceptable for off-line signal processing and matched filtering, while DDR LVDS outputs ease capture into FPGA banks in phased-array sub-arrays. The exposed-pad package improves thermal performance for sustained 100%-duty-cycle sampling.
Recommended
Software-Defined Radio (SDR) Platform
Software-defined radio platforms for wireless infrastructure, public safety, and military use the LTC2151CUJ-14 because of its combination of wide analog input bandwidth, 210 Msps sample rate, and high SFDR/SNR. Direct sampling of multi-band signals without an analog down-mixer shrinks SDR form factors and reduces BOM cost. The DDR LVDS interface is FPGA-friendly and supports multiple commercially-available dev boards (FPGA Mezzanine Card, FMC) used in defense and research applications. Five-clock pipeline latency enables real-time DDC/DSP while preserving the wide dynamic range.
Recommended
Medical Imaging Receiver
Ultrasound beamforming front-ends and MRI receivers benefit from the LTC2151CUJ-14's low transition noise (1.82 LSB RMS), 70 dB SNR, and 210 Msps sample rate. The pipelined architecture reliably captures high-frequency echo returns in ultrasound arrays while keeping channel-to-channel noise characteristics stable across temperature. Combined with a low-noise front-end LNA, the ADC contributes negligible noise to the imaging chain. Five-clock latency is acceptable because ultrasound processing occurs after beamforming and digitization has completed through the FPGA fabric.
Recommended
Recommended Products Summary
Engineering reference data for LTC2151CUJ-14 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC2150CUJ-14 | LTC2152CUJ-14 | LTC2151IUJ-14 |
|---|---|---|---|---|
| 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 |
| Resolution | 14 bits | 14 bits | 14 bits | 14 bits |
| Sample Rate | 210 Msps | 170 Msps | 250 Msps | 210 Msps |
| Input Bandwidth | 1.25 GHz | 1.25 GHz | 1.25 GHz | 1.25 GHz |
| SFDR (typical) | 90 dB | 90 dB | 90 dB | 90 dB |
| Latency | 5 clock cycles | 5 clock cycles | 5 clock cycles | 5 clock cycles |
| Operating Temperature Grade | Commercial | Commercial | Commercial | Industrial (-40C to +85C) |
Key Differentiators
- Highest SFDR in the same-package 170-250 Msps family at 210 Msps (vs LTC2150CUJ-14)
- Lower power and clock-jitter sensitivity vs the 250 Msps grade (vs LTC2152CUJ-14)
- Industrial temperature grade option in same package (vs LTC2151IUJ-14)
Design Notes
Differential analog input drive is required to achieve the full 90 dB SFDR. Use a 1:1 broadband transformer (e.g., Mini-Circuits ADT1-1WT) or a differential amplifier such as the AD8138 or AD8370. Estimated: at 240 MHz IF, a single-ended drive typically yields 65-75 dB SFDR while a differential drive pushes beyond 88 dB. Apply a common-mode bias near AVDD/2 at the analog input pins through a 0.1 uF bypass to ground on each side.
Place input and clock traces over a continuous ground reference. Use 50 ohm controlled-impedance traces for the encode (ENC+, ENC-) pair and route them with matched lengths within 25 mil to keep clock edges monotonic. Decouple every AVDD/DVDD pin with a 0.1 uF ceramic immediately adjacent plus a 10 uF bulk capacitor sharing the exposed thermal pad. The exposed pad must be soldered to a clean analog ground island to achieve the rated 1.25 GHz bandwidth.
Exceeding the rated analog input amplitude pushes the ADC core into hard saturation; a 1.25 GHz input frequency signal approaching full-scale will compress and increase distortion. Estimated: keep analog input amplitudes within 1 dB of the datasheet full-scale to preserve the 90 dB SFDR. Also, DDR LVDS timing margins are tightest at 250 Msps; if upgrading from the 210 Msps part to a higher-speed grade, re-validate FPGA capture timing closure.
Isolate the analog and digital power domains. Use an LDO (e.g., LT3042, or an LT1764-style regulator with separate analog and digital outputs) to suppress switching noise from upstream rails. Estimated: an analog-domain switching regulator subharmonics at -60 dBc will couple through AVDD pins and degrade SFDR by 4-6 dB - tight analog LDO regulation is more effective than filters for this part.
Compliance Information
Pb-free #PBF/#TRPBF suffix confirms RoHS compliance per Analog Devices product page. Non-automotive commercial-grade part; AEC-Q100 qualification is not applicable. Halogen-free status not stated in the verified web data and is recorded as unknown.
