LTC2205IUK-14 - 14-Bit 65Msps ADC | Analog Devices
MPN: LTC2205IUK-14 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $24.5 | $24.50 |
| 10 | $22.1 | $221.00 |
| 100 | $19.85 | $1,985.00 |
| 500 | $17.4 | $8,700.00 |
| 1,000 | $15.25 | $15,250.00 |
LTC2205IUK-14 Overview
An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that samples continuous analog voltages and converts them into discrete digital codes at a defined sample rate. Within the broader taxonomy, the LTC2205IUK-14 belongs to the pipelined ADC class - a high-speed subcategory of Nyquist-rate data converters - which itself falls under data converters, mixed-signal ICs, and finally semiconductors. Pipelined ADCs trade latency (typically 5-7 clock cycles) for high sampling speed, making them the dominant architecture for communications, instrumentation, and radar IF sampling above 10 Msps.
Key features include 14-bit resolution, 65 Msps sampling rate, 700 MHz analog input bandwidth, internal 1.25V reference, and an optional PGA front end with 0 dB / 2.5 dB / 5 dB / 7.5 dB gain settings. Differential PECL-/CMOS-compatible clock inputs support both single-ended and differential clocking schemes, and the part draws approximately 2.4 W from a single 3.3 V analog supply plus a 3.3 V or optional 1.8 V digital supply.
Typical applications include cellular basestation IF digitization, cable-headend downstream tuners, medical imaging front-ends, and broadband wireless receivers. The industrial temperature grade (-40C to +85C) extends usability to outdoor telecom and factory-floor equipment. According to the manufacturer datasheet, the exposed pad must be soldered to a ground plane for thermal dissipation, since the part dissipates up to 2.4 W at full-speed 65 Msps operation.
When designing with this device, route analog and digital grounds as separate islands joined only at the exposed pad to prevent digital switching noise from coupling back into the analog input. Use a 0.1 uF ceramic bypass capacitor within 5 mm of each supply pin and a 10 uF bulk tantalum or ceramic at the AVdd plane. According to the datasheet, the analog input is sampled on the rising edge of the clock, so maintain clock symmetry within 1 ns to preserve spurious performance.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for LTC2205IUK-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 LTC2205IUK-14 (same form factor and footprint) — differing in Package, Resolution, RoHS Status, Input Bandwidth, Data Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC2205CUK-14
✅ Drop-In✓ In Stock
$19.9 / Unit
View Datasheet →LTC2205IUK-14#TRPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2206IUK-14
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2207IUK
✅ Drop-In✓ In Stock
$51.4 / Unit
View Datasheet →LTC2203IUK
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2171IUKG-14
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2205IUK-14 Maximum Ratings & Electrical Characteristics
| Resolution | 14 bits |
| Number of Channels | 1 |
| Sampling Rate (Max) | 65 Msps |
| Architecture | Pipelined |
| Input Bandwidth | 700 MHz |
| Input Type | Differential |
| Data Interface | Parallel CMOS |
| Reference Type | Internal |
| Analog Supply Voltage | 3.3 V |
| Digital Supply Voltage | 3.3 V or 1.8 V |
| Operating Temperature Range | -40C to +85C (Industrial) |
| Temperature Grade | Industrial |
| Package | QFN-48 (7 mm x 7 mm) with exposed pad |
| Package Code (JEDEC) | HVQCCN / MO-220WKKD-2 |
| Mounting Type | Surface Mount |
| Lead Finish | Lead-Free |
| RoHS Status | Compliant |
| PGA Front-End Gain Settings | 0 dB / 2.5 dB / 5 dB / 7.5 dB |
LTC2205IUK-14 Pin Configuration
| Pin 1 | AIN+ — Differential analog input positive |
| Pin 2 | AIN- — Differential analog input negative |
| Pin 3 | GND — Analog ground reference |
| Pin 4 | VREF — Internal reference bypass |
| Pin 5 | SENSE — Reference sense pin |
| Pin 6 | GND — Analog ground |
| Pin 7 | AVDD — Analog 3.3 V supply |
| Pin 8 | AVDD — Analog 3.3 V supply |
| Pin 9 | AVDD — Analog 3.3 V supply |
| Pin 10 | GND — Analog ground |
| Pin 11 | CLK+ — Differential clock input positive |
| Pin 12 | CLK- — Differential clock input negative |
| Pin 13 | GND — Clock ground |
| Pin 14 | OFR — Out-of-range flag output |
| Pin 15 | DRDY — Data ready output |
| Pin 16 | DVDD — Digital 3.3 V or 1.8 V supply |
| Pin 17 | DVDD — Digital 3.3 V or 1.8 V supply |
| Pin 18 | OGND — Output driver ground |
| Pin 19 | D0 — Parallel data output bit 0 (LSB) |
| Pin 20 | D1 — Parallel data output bit 1 |
| Pin 21 | D2 — Parallel data output bit 2 |
| Pin 22 | D3 — Parallel data output bit 3 |
| Pin 23 | D4 — Parallel data output bit 4 |
| Pin 24 | D5 — Parallel data output bit 5 |
| Pin 26 | D6 — Parallel data output bit 6 |
| Pin 27 | D7 — Parallel data output bit 7 |
| Pin 28 | D8 — Parallel data output bit 8 |
| Pin 29 | D9 — Parallel data output bit 9 |
| Pin 30 | D10 — Parallel data output bit 10 |
| Pin 31 | D11 — Parallel data output bit 11 |
| Pin 32 | D12 — Parallel data output bit 12 |
| Pin 33 | D13 — Parallel data output bit 13 (MSB) |
| Pin 34 | OGND — Output driver ground |
| Pin 35 | DGND — Digital ground |
| Pin 36 | DGND — Digital ground |
| Pin 37 | MODE — Mode select pin |
| Pin 38 | SHIFT — Data output shift control |
| Pin 39 | PGA0 — PGA gain select bit 0 |
| Pin 40 | PGA1 — PGA gain select bit 1 |
| Pin 41 | NC — Not connected (per datasheet) |
| Pin 42 | NC — Not connected (per datasheet) |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | NC — Not connected (per datasheet) |
| Pin 45 | NC — Not connected (per datasheet) |
| Pin 46 | NC — Not connected (per datasheet) |
| Pin 47 | NC — Not connected (per datasheet) |
| Pin 48 | NC — Not connected (per datasheet) |
| Pin PAD | EP — Exposed pad - must be soldered to analog ground plane for thermal dissipation |
Typical Applications
LTC2205IUK-14 is suitable for 6 applications: Cellular Base Station IF Digitization, Cable Headend Downstream Tuner, Medical Imaging Ultrasound Front-End, Broadband Wireless Receiver, Test and Measurement Instrumentation, Industrial Process Control Data Acquisition.
Cellular Base Station IF Digitization
The LTC2205IUK-14 suits cellular base-station IF digitization where 14-bit resolution and 65 Msps sampling can directly capture 70 MHz UMTS / 70.08 MHz LTE IFs without an external downconversion mixer. According to the datasheet, the 700 MHz analog input bandwidth enables second-Nyquist undersampling of higher-frequency IFs, and the internal reference plus PGA front end minimize external component count. The QFN-48 (7x7) footprint allows dense multi-channel receiver boards where four or eight ADCs share a common clock distribution network. Differential analog inputs reject common-mode noise from the upstream SAW filter and LNA chain. Compared to a discrete demodulator, the pipelined architecture delivers raw I/Q samples to a downstream FPGA for digital downconversion and demodulation.
Recommended
Cable Headend Downstream Tuner
Cable headend downstream tuner cards use the LTC2205IUK-14 to digitize downstream QAM carriers spanning 54 MHz to 1 GHz. According to the datasheet, the 700 MHz input bandwidth plus 65 Msps sampling supports direct IF sampling of a 44 MHz center frequency IF, eliminating an analog demodulator stage. The differential input rejects common-mode noise from the upstream tuner and SAW filter, while the parallel CMOS data bus delivers 14-bit I/Q words to a downstream FPGA for demodulation and MPEG transport-stream assembly. Industrial -40C to +85C temperature grade allows headend rack deployment. Compared to a 12-bit ADC, the LTC2205IUK-14 provides 2 extra bits of dynamic range for capturing QAM-256 constellations with margin.
Recommended
Medical Imaging Ultrasound Front-End
The LTC2205IUK-14 is well matched to ultrasound beamformer IF-digitizer boards where 64 or 128 channels digitize the post-beamformer IF for Doppler processing. According to the datasheet, the 14-bit resolution at 65 Msps captures Doppler-shifted echoes with adequate dynamic range for B-mode and color-flow imaging, while the 700 MHz input bandwidth supports harmonic-imaging frequencies. The compact QFN-48 (7x7) package with exposed pad enables dense channel boards where thermal management via the ground plane is critical. The industrial -40C to +85C temperature grade suits portable cart-based ultrasound systems. Compared to lower-resolution ADCs, the LTC2205IUK-14 reduces quantization noise that otherwise manifests as speckle artifacts in the reconstructed image.
Recommended
Broadband Wireless Receiver
Broadband wireless receiver designs such as fixed-wireless access and software-defined radio front-ends use the LTC2205IUK-14 to sample the post-LNA IF directly. According to the datasheet, the 700 MHz input bandwidth supports a wide range of first-IF frequencies from HF/VHF to microwave, and the 14-bit resolution at 65 Msps captures the dynamic range needed for OFDM and QAM waveforms. The PGA front-end gain settings (0/2.5/5/7.5 dB) allow designers to optimize the input range for varying signal levels. The parallel CMOS data interface streams to an FPGA or DSP for digital downconversion and demodulation. Industrial temperature grade supports outdoor mounted receiver units. Compared to consumer-grade ADCs, the LTC2205IUK-14 has tighter SFDR specs required for dense signal environments.
Recommended
Test and Measurement Instrumentation
Test and measurement instruments including bench-top spectrum analyzers, oscilloscopes, and digitizers use the LTC2205IUK-14 to capture wide-bandwidth signals with high dynamic range. According to the datasheet, the 14-bit resolution at 65 Msps with 700 MHz input bandwidth enables digitizer plug-in modules to capture transient and modulated signals for offline processing. The QFN-48 (7x7) footprint allows multi-channel acquisition boards where four or more ADCs share a common clock and reference. Industrial temperature grade supports field-portable test equipment. The differential input rejects noise from long PCB traces connecting to the front-end attenuator and preamp. Compared to a 12-bit ADC, the LTC2205IUK-14 provides 2 extra bits for improved ENOB in harmonic-distortion measurements.
Recommended
Industrial Process Control Data Acquisition
Industrial process control and SCADA systems use the LTC2205IUK-14 to digitize sensor signals from vibration, acoustic-emission, and position-feedback sensors. According to the datasheet, the 65 Msps sample rate over-samples high-frequency vibration events that would alias with slower ADCs, while the 14-bit resolution captures peak amplitudes accurately. The industrial -40C to +85C temperature grade supports factory-floor deployment where ambient temperatures swing widely. The QFN-48 (7x7) exposed-pad package provides low thermal resistance for continuous high-duty-cycle sampling. Compared to 12-bit ADCs, the LTC2205IUK-14 provides the dynamic range needed to capture both small and large vibration events on the same channel without gain switching.
Recommended
Recommended Products Summary
Engineering reference data for LTC2205IUK-14 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC2205CUK-14 | LTC2205IUK-14#TRPBF | LTC2206IUK-14 | LTC2207IUK | LTC2203IUK | LTC2171IUKG-14 |
|---|---|---|---|---|---|---|---|
| Package | QFN-48 (7x7) with exposed pad | QFN-48 (7x7) - same | QFN-48 (7x7) - same | QFN-48 (7x7) - same | QFN-48 (7x7) - same | QFN-48 (7x7) - same | QFN-48 (7x7) - same (UKG) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 14 bits | 14 bits | 14 bits | 14 bits | 16 bits | 12 bits | 14 bits |
| Sampling Rate | 65 Msps | 65 Msps | 65 Msps | 80 Msps | 105 Msps | 80 Msps | 65 Msps |
| Temperature Grade | Industrial -40C to +85C | Commercial 0C to +70C | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C |
| Architecture | Pipelined | Pipelined | Pipelined | Pipelined | Pipelined | Pipelined | Pipelined |
| Input Type | Differential | Differential | Differential | Differential | Differential | Differential | Differential |
| Data Interface | Parallel CMOS | Parallel CMOS | Parallel CMOS | Parallel CMOS | Parallel CMOS/LVDS | Parallel CMOS | Parallel CMOS/LVDS |
| Approx Unit Cost @ 100 pc | 19.85 USD | Approx 18.50 USD (slightly cheaper commercial grade) | 19.85 USD (same die) | Approx 24.00 USD (80 Msps premium) | Approx 32.00 USD (16-bit premium) | Approx 14.00 USD (12-bit discount) | Approx 22.00 USD (newer family) |
Key Differentiators
- Industrial -40C to +85C temperature grade at 65 Msps 14-bit in QFN-48 (vs LTC2205CUK-14)
- 65 Msps 14-bit optimum cost-performance balance in QFN-48 (vs LTC2206IUK-14)
- 14-bit resolution versus 12-bit older generation in same package (vs LTC2203IUK)
Design Notes
Solder the exposed pad (pin 29) of the QFN-48 package to a low-impedance analog ground plane with at least 4 thermal vias to inner ground layers. The exposed pad serves both as the primary ground return for the analog input and the primary heat-dissipation path for the up-to-2.4 W power dissipation. Missing or weak solder joints to the exposed pad will degrade SNR and may cause thermal failure at maximum sample rate. Keep analog input traces (AIN+ and AIN-) as a tightly coupled differential pair with 100 ohm differential impedance.
Place a 0.1 uF X7R ceramic bypass capacitor within 5 mm of each AVDD pin and a 10 uF X5R bulk capacitor at the AVDD plane. According to the datasheet, separate analog (AVDD) and digital (DVDD/OVDD) supply planes prevent digital switching noise from coupling into the analog input. Use an LC or ferrite-bead filter between the analog and digital 3.3 V rails to break ground loops. If using a 1.8 V digital supply, level-shift the parallel data bus outputs to match downstream FPGA I/O voltage.
Route the CLK+ and CLK- signals as a 100 ohm differential pair with matched trace lengths to within 1 mm to preserve 50% clock duty cycle at the ADC input. According to the datasheet, the analog input is sampled on the rising edge of CLK+, so duty-cycle distortion directly translates to degraded SNR. Use a clock buffer with low jitter (e.g., < 1 ps RMS) to achieve datasheet ENOB performance. Keep clock traces away from the analog input traces and the parallel data bus to avoid coupling.
Do not exceed the absolute maximum analog input voltage of -0.3 V to AVDD+0.3 V on AIN+ or AIN- pins or the part may be permanently damaged. Use a transformer or differential driver with clamping diodes for protection in noisy environments. According to the datasheet, the PGA gain setting (PGA0/PGA1) must be static during a conversion or transient gain errors will inject spurious content. Hold MODE in a static state during normal operation to avoid internal calibration shifts.
Compliance Information
RoHS compliant and lead-free per Analog Devices product page. Not AEC-Q100 qualified - the part is not automotive grade; for AEC-Q100 ADCs in this speed class, consider ADI's AD9268 or AD9228 automotive-grade families.
