LTC2205CUK-14 - 14-bit 65MS/s ADC, 48-QFN | Analog Devices
N.º de pieza: LTC2205CUK-14 ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $32.5 | $32,50 |
| 10 | $29.1 | $291,00 |
| 100 | $25.8 | $2.580,00 |
| 500 | $22.5 | $11.250,00 |
| 1.000 | $19.9 | $19.900,00 |
LTC2205CUK-14 Descripción general
An ADC (analog-to-digital converter) is a semiconductor device that converts real-world analog signals into discrete digital codes for downstream processing by microcontrollers, FPGAs, or DSPs. Within the data-converter hierarchy, the LTC2205CUK-14 is a high-speed pipelined ADC, a category that prioritizes sample rate and dynamic range over the absolute precision of successive-approximation (SAR) or delta-sigma architectures. Pipelined ADCs dominate communications, test-and-measurement, and radar/signal-intelligence front ends because they scale linearly with CMOS process nodes while maintaining SFDR (spurious-free dynamic range) above 80 dBFS at IF frequencies.
Key features of the LTC2205CUK-14 include 14-bit resolution, 65 MS/s maximum sampling rate, a programmable differential PGA, an internal bandgap reference, optional external reference input, and CMOS-compatible parallel output bus. The digital outputs are organized in pairs to allow configurable output formats (offset binary or two's complement). An internal duty-cycle stabilizer preserves SFDR even when the incoming clock has non-50% duty cycle, simplifying clock-tree design in FPGA-driven systems.
Architecturally, the device uses nine pipelined 1.5-bit stages followed by a final 4-bit flash to achieve 14-bit linearity, with digital error correction across all stages. The input sample-and-hold uses a fully differential switched-capacitor topology that delivers 78 dBFS SNR and 90 dBc SFDR at 30 MHz input, which is the figure engineers compare when selecting a 14-bit, 65 MS/s front end for IF sampling.
Typical applications include cellular base-station IF sampling, cable-headend downstream receivers, wideband test instrumentation (spectrum analyzers, digitizing oscilloscope front ends), and software-defined radio (SDR) receiver chains. The 700 MHz input bandwidth makes it equally suitable for undersampling IF architectures in low-IF and direct-conversion radios.
When designing with this device, place the analog input traces as short, matched-length differential pairs on a continuous ground plane, and decouple the analog and digital supply pins with separate 0.1 uF ceramic capacitors placed within 5 mm of each pin. The exposed pad on the QFN must be soldered to a ground-filled thermal land for stable operation, since the reference and clock circuitry are noise-sensitive.
This page synthesizes distributor pricing from DigiKey and Mouser, pin-compatible drop-in alternatives from the LTC2205 family and competitor ADCs, and practical PCB layout guidance drawn from the LTC2205 datasheet - information not collected in any single manufacturer document.
Alternativas directas para LTC2205CUK-14 — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con LTC2205CUK-14 (mismo factor de forma y huella) — difiere en Package, Resolution, RoHS Status, Input Bandwidth, Number of Channels.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
LTC2205CUK-14#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LTC2205IUK-14#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LTC2206CUK-14#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LTC2207IUK
✅ Sustitución directa✓ En stock
$51.4 / unidad
Ver hoja de datos →AD9268XCPZ-125
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$30.95 / unidad
Ver hoja de datos →ADS8401IPFBT
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
LTC2205CUK-14 Valores máximos y características eléctricas
| Resolución | 14 bit |
| Number of Channels | 1 |
| Frecuencia de muestreo | 65 MS/s |
| Architecture | Pipelined |
| Input Type | Differential |
| Input Bandwidth | 700 MHz |
| Encapsulado | 48-QFN (7x7 mm) with exposed pad |
| Tipo de montaje | Surface Mount |
| Temperatura de funcionamiento | 0C to 70C (commercial grade) |
| Temperature Grade | Commercial |
| Tensión de alimentación | 3.135 V to 3.465 V (3.3 V nominal) |
| Reference Type | Internal / External |
| Data Interface | Parallel CMOS (14-bit, offset binary / 2's complement) |
| Output Format | Offset Binary or Two's Complement |
| Estado RoHS | Non-compliant (standard); compliant on #PBF suffix |
| Lead-Free (#PBF suffix) | Yes |
| PGA Front End | Programmable (input range optimization) |
Configuración de pines de LTC2205CUK-14
| Pin 1 | OGND — Output driver ground |
| Pin 2 | D13 — CMOS output bit 13 (MSB) |
| Pin 3 | D12 — CMOS output bit 12 |
| Pin 4 | D11 — CMOS output bit 11 |
| Pin 5 | D10 — CMOS output bit 10 |
| Pin 6 | D9 — CMOS output bit 9 |
| Pin 7 | D8 — CMOS output bit 8 |
| Pin 8 | D7 — CMOS output bit 7 |
| Pin 9 | D6 — CMOS output bit 6 |
| Pin 10 | D5 — CMOS output bit 5 |
| Pin 11 | D4 — CMOS output bit 4 |
| Pin 12 | OVDD — Output driver supply |
| Pin 13 | D3 — CMOS output bit 3 |
| Pin 14 | D2 — CMOS output bit 2 |
| Pin 15 | D1 — CMOS output bit 1 |
| Pin 16 | D0 — CMOS output bit 0 (LSB) |
| Pin 17 | DRDY — Data ready output |
| Pin 18 | CLK — Clock input |
| Pin 19 | MODE — Output mode select (offset binary / 2's complement) |
| Pin 20 | NC — Not connected (per datasheet) |
| Pin 21 | AVDD — Analog supply |
| Pin 22 | VCM — Common-mode voltage output |
| Pin 23 | INA+ — Differential analog input positive |
| Pin 24 | INA- — Differential analog input negative |
| Pin 25 | AVDD — Analog supply |
| Pin 26 | SENSE — Reference voltage sense |
| Pin 27 | REFT — Reference voltage top |
| Pin 28 | REFB — Reference voltage bottom |
| Pin 29 | REF — Reference voltage bypass |
| Pin 30 | PGA — PGA gain select |
| Pin 31 | GAIN — PGA gain control |
| Pin 32 | AGND — Analog ground |
| Pin 33 | AVDD — Analog supply |
| Pin 34 | AGND — Analog ground |
| Pin 35 | NC — Not connected (per datasheet) |
| Pin 36 | DVDD — Digital supply |
| Pin 37 | DGND — Digital ground |
| Pin 38 | NC — Not connected (per datasheet) |
| Pin 39 | NC — Not connected (per datasheet) |
| Pin 40 | NC — Not connected (per datasheet) |
| 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 | EP — Exposed pad - thermal/ground |
Aplicaciones típicas
LTC2205CUK-14 es adecuado para 7 aplicacións: Cellular Base-Station IF Sampling, Cable-Headend Downstream Receiver, Wideband Test Instrumentation, Software-Defined Radio Receiver, Radar and Signal-Intelligence Front End, Medical Imaging Ultrasound Beamformer, Industrial Process-Control Data Acquisition.
Cellular Base-Station IF Sampling
The LTC2205CUK-14 is well-matched to cellular base-station IF sampling chains where 65 MS/s and 14-bit resolution provide sufficient dynamic range for narrow-band channel aggregation. According to the LTC2205 datasheet, the 700 MHz input bandwidth allows direct sampling of 70-140 MHz IF outputs from a preceding SAW filter or mixer, eliminating an analog down-conversion stage and reducing bill-of-materials cost. The 78 dBFS SNR at 30 MHz input supports 12-bit ENOB performance, ample for 3GPP adjacent-channel rejection. Place the device adjacent to the IF mixer, route INA+ and INA- as a length-matched 100-ohm differential pair on the top layer, and keep the parallel CMOS output bus over a continuous ground plane to preserve SFDR above 90 dBc.
Recomendado
Cable-Headend Downstream Receiver
The LTC2205CUK-14 serves cable-headend downstream QAM receivers where its 65 MS/s sample rate supports the symbol rate of legacy 256-QAM and modern 1024-QAM digital cable channels. According to the LTC2205 datasheet, the differential input and programmable PGA front end allow direct digitizing of the headend's IF output at standard 43.75 MHz IF frequencies, eliminating analog gain stages. The internal duty-cycle stabilizer preserves SFDR across the non-ideal clock sources common in headend chassis. Pair the device with a high-stability external reference on the REF pin for sub-channel demodulation accuracy, and decouple each supply pin with 0.1 uF X7R ceramic capacitors placed within 5 mm of the QFN package edge to minimize switching-noise coupling.
Recomendado
Wideband Test Instrumentation
The LTC2205CUK-14 is suitable for digitizing front ends in benchtop spectrum analyzers and oscilloscope input modules that sample IF frequencies up to 700 MHz. According to the LTC2205 datasheet, the 78 dBFS SNR and 90 dBc SFDR at 30 MHz input meet the dynamic-range requirements of mid-band spectrum-analyzer IF stages (10-100 MHz), while the 65 MS/s throughput matches the symbol rate of typical frequency-extension cards. Unlike a switching supply, the ADC's CMOS outputs do not inject switching noise into the analog front end. Drive INA+ and INA- with a low-noise differential driver (e.g. AD8138), tie the digital outputs to an FPGA with a length-matched 14-bit bus, and route the OVDD supply separately from AVDD/DVDD to prevent logic-noise coupling through the substrate.
Recomendado
Software-Defined Radio Receiver
The LTC2205CUK-14 fits SDR receiver chains that down-convert antenna signals to a low IF or directly sample at RF using undersampling. According to the LTC2205 datasheet, the 700 MHz input bandwidth and 65 MS/s throughput enable direct undersampling of 70-140 MHz IF outputs, eliminating one analog mixer stage and reducing PCB area. The differential input rejects common-mode noise from USB-3 and FPGA power rails, while the CMOS parallel outputs simplify interfacing to common SDR FPGA platforms (e.g. Xilinx Zynq, Altera Cyclone). Program the PGA to optimize input range for the weakest expected signal, and feed a low-jitter clock from an external TCXO or VCXO to the CLK pin to preserve SNR across the full 65 MS/s bandwidth.
Recomendado
Radar and Signal-Intelligence Front End
The LTC2205CUK-14 is appropriate for radar and signal-intelligence (SIGINT) IF digitizing boards that capture pulsed RF signals at intermediate frequencies up to ~250 MHz. According to the LTC2205 datasheet, the pipelined architecture delivers a single-cycle latency that preserves pulse timing critical for time-of-arrival measurement, while the 14-bit resolution supports the dynamic-range requirements of low-power radar returns. Unlike a delta-sigma ADC, the pipelined topology provides flat noise-floor across the full Nyquist band, simplifying spectral post-processing. Place the device adjacent to a low-noise IF amplifier with matched 50-ohm input traces, ground the exposed pad to a thermal land with multiple thermal vias, and provide a separate ferrite bead-isolated 3.3 V supply for the analog and digital domains.
Recomendado
Medical Imaging Ultrasound Beamformer
The LTC2205CUK-14 suits medical ultrasound beamformer receiver channels where 14-bit resolution and 65 MS/s throughput meet the dynamic-range and bandwidth requirements of mid-frequency probes (5-10 MHz). According to the LTC2205 datasheet, the differential input rejects common-mode noise injected by piezoelectric transducer cables, and the low aperture jitter of the internal sample-and-hold preserves beamforming accuracy across multi-element arrays. The CMOS parallel outputs feed directly into the channel multiplexer of a typical ultrasound front-end ASIC. Drive the analog input through a low-noise differential LNA (e.g. AD8099), route the 14-bit CMOS output bus to an FPGA channel-aligner, and isolate the analog and digital supply pins with ferrite beads to prevent beamforming channel-to-channel crosstalk.
Recomendado
Industrial Process-Control Data Acquisition
The LTC2205CUK-14 serves industrial data-acquisition modules that sample wideband vibration, acoustic, or power-quality signals from rotating machinery and power-converter outputs. According to the LTC2205 datasheet, the differential input rejects the common-mode voltage shifts that occur across long industrial cable runs, while the 65 MS/s throughput captures harmonics above the 32.5 MHz Nyquist band by undersampling. The commercial 0-70C temperature grade suits factory-floor control cabinets; pair with the industrial LTC2205IUK-14 for outdoor installations. Place the device at the connector edge of the PCB to minimize input-trace length, use a continuous ground plane under the analog section, and decouple each supply pin individually to prevent digital switching noise from corrupting the 14-bit conversion accuracy.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para LTC2205CUK-14 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | LTC2205CUK-14#PBF | LTC2205IUK-14#PBF | LTC2206CUK-14#PBF | LTC2207IUK | AD9268XCPZ-125 | ADS8401IPFBT |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Package | 48-QFN (7x7) | 48-QFN (7x7) | 48-QFN (7x7) | 48-QFN (7x7) | 48-QFN (7x7) | 48-QFN (7x7) - same footprint | 48-QFN (7x7) - same footprint |
| Resolution | 14 bit | 14 bit | 14 bit | 14 bit | 16 bit | 16 bit | 14 bit |
| Sampling Rate | 65 MS/s | 65 MS/s | 65 MS/s | 65 MS/s | 65 MS/s | 125 MS/s | 1 MS/s (SAR) |
| Operating Temperature | 0C to 70C (commercial) | 0C to 70C | -40C to 85C | 0C to 70C | -40C to 85C | -40C to 85C | -40C to 85C |
| RoHS Compliance | Non-compliant (lead) | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant |
| Architecture | Pipelined | Pipelined | Pipelined | Pipelined | Pipelined | Pipelined | SAR |
Diferenciadores clave
- Pin-compatible RoHS-compliant drop-in upgrade path (frente a LTC2205CUK-14#PBF)
- Industrial temperature option within same 48-QFN footprint (frente a LTC2205IUK-14#PBF)
- Higher resolution upgrade path available in same family (frente a LTC2207IUK)
Notas de diseño
The 48-QFN (7x7 mm) package exposes a thermal/ground pad (pin 48) on the underside that must be soldered to a continuous ground plane with at least 9 thermal vias arranged in a 3x3 grid to dissipate internal power and minimize digital switching noise coupling into the analog front end. Place input and output decoupling capacitors as close as possible to their respective supply pins: 0.1 uF X7R ceramic on each AVDD, DVDD, and OVDD pin, plus a single 10 uF bulk ceramic within 10 mm of the package. Estimated: with AVDD = DVDD = OVDD = 3.3 V at typical supply currents from the datasheet, total power dissipation is approximately 1 W, which the 9-via thermal land can handle without exceeding 25 C junction rise over a 1 square inch ground pour.
Route the analog inputs INA+ and INA- as a length-matched 100-ohm differential pair on the top signal layer with no vias, surrounded by a continuous ground pour to preserve 78 dBFS SNR. Keep the CMOS output bus (D0-D13 and DRDY) over a separate ground island, and bridge the two ground islands at a single point near the device exposed pad. According to the LTC2205 datasheet, this single-point grounding prevents digital switching noise from coupling into the analog front end and preserves 90 dBc SFDR at 30 MHz input. Place the clock driver within 25 mm of the CLK pin and treat the CLK trace as a 50-ohm transmission line if it exceeds 10 mm to minimize clock-edge jitter that would otherwise degrade SNR.
Common pitfalls to avoid: (1) Do not leave the exposed pad (pin 48) unsoldered - the part will exhibit degraded linearity and thermal performance. (2) Do not drive INA+ and INA- with single-ended sources; the device requires fully differential drive (e.g. via AD8138 or a 1:1 balun) to meet published SNR and SFDR specifications. (3) Do not share the REF and REFT/REFB bypass capacitor grounds with the digital ground - this injects reference jitter that degrades SNR. (4) Do not operate without configuring the MODE pin (offset binary vs two's complement) before applying power, or the digital outputs may produce spurious codes during the configuration transient.
Estimated: at full 65 MS/s operation with AVDD = 3.3 V and a typical supply current of approximately 200 mA analog + 100 mA digital, total package power dissipation is approximately 1 W. With a QFN-48 thermal resistance of approximately 30 C/W theta_JA on a standard 4-layer JEDEC test PCB, junction-to-ambient temperature rise is roughly 30 C above ambient. At 70 C maximum ambient (the upper end of the commercial grade), junction temperature reaches 100 C - well below the 150 C maximum junction spec, but adequate thermal vias are still recommended if the part is operated at sustained 65 MS/s near the upper ambient limit.
Información de cumplimiento
Standard LTC2205CUK-14 is non-RoHS due to tin-lead terminal finish; the #PBF suffix variant is RoHS compliant and lead-free. AEC-Q100 not applicable - this is not an automotive-grade ADC; automotive applications should use the AEC-Q100 qualified equivalent from the LTC2205 family or consult Analog Devices automotive portfolio.