LTC2281CUP - Dual 10-Bit 125Msps 3V ADC | Analog Devices
N.º de pieza: LTC2281CUP ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $29.41 | $29,41 |
| 10 | $27.18 | $271,80 |
| 100 | $24.62 | $2.462,00 |
| 500 | $22.05 | $11.025,00 |
| 1.000 | $19.68 | $19.680,00 |
LTC2281CUP Descripción general
A pipelined ADC is a multi-stage converter architecture where each stage samples and produces a multi-bit residue, with stages cascaded through low-resolution flash sub-ADCs and DACs. Pipelined ADCs are the dominant architecture for sampling rates above ~10 Msps because they achieve a favourable trade-off between conversion speed, resolution, and die area. The LTC2281CUP belongs to the hierarchy: ADC -> data converter -> signal chain IC -> semiconductor, occupying the dual-channel, low-power, high-speed segment.
Key features include 1.2 Vp-p or 2 Vp-p selectable input ranges, an internal 2.5V reference, low power dissipation that scales with sample rate, and a CMOS-compatible parallel digital output bus. The wideband differential front-end accepts single-ended or differential analog inputs and integrates input signal termination. A separate digital output supply (OVDD) allows the outputs to interface directly to 1.8V, 2.5V, or 3.3V logic without level translators.
The LTC2281CUP uses 9-stage pipelined cores per channel with digital error correction, providing spurious-free dynamic range strong enough for cellular base-station IF sampling and radar intermediate-frequency (IF) digitizers. The 125 Msps dual-channel throughput is sufficient for multi-antenna MIMO receivers where baseband I/Q must be captured in parallel. Per-channel power typically sits in the low hundreds of milliwatts, simplifying thermal design in dense multi-channel acquisitions.
Typical applications include medical and industrial imaging digitizers, base-station receiver IF strips, cable-head-end QAM/QPSK demodulators, multi-channel data acquisition front-ends, and software-defined radio (SDR) receiver IF/BB ADC stages. The combination of low power and high SFDR also suits portable instrumentation and spectrum-analyzer digitizer boards.
Designers should provide a low-noise, low-impedance analog input network (typically a differential driver such as the AD8138 or an RF transformer) and route the LVDS/CMOS outputs with controlled-impedance traces to avoid digital-coupling noise into the analog front-end. The exposed pad (UP package thermal pad) must be soldered to a solid ground plane to keep junction temperature within the 0C to +70C commercial range.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Alternativas directas para LTC2281CUP — 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 LTC2281CUP (mismo factor de forma y huella) — difiere en Resolution, RoHS Status, Package, SFDR, Number of Channels.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
LTC2281IUP
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LTC2285CUP
✅ Sustitución directa✓ En stock
$65.1 / unidad
Ver hoja de datos →LTC2283CUP
✅ Sustitución directa✓ En stock
$38.95 / unidad
Ver hoja de datos →LTC2280CUP
✅ Sustitución directa✓ En stock
$15.85 / unidad
Ver hoja de datos →LTC2286CUP
✅ Sustitución directa✓ En stock
$9.56 / unidad
Ver hoja de datos →LTC2281CUP Valores máximos y características eléctricas
| Resolución | 10 bits |
| Number of Channels | 2 (dual) |
| Frecuencia de muestreo | 125 Msps |
| Supply Voltage (Analog) | 3 V (2.85 V to 3.4 V) |
| Output Supply Voltage (OVDD) | 1.8 V to 3.3 V |
| Input Range (Selectable) | 1.2 Vp-p or 2 Vp-p |
| Input Type | Differential / Single-Ended |
| Architecture | Pipelined |
| SNR at Nyquist | 61.6 dB |
| SFDR at Nyquist | 82 dB |
| Data Interface | Parallel CMOS |
| Reference | Internal 2.5 V (external optional) |
| Rango de temperatura de funcionamiento | 0 C to +70 C (C grade) |
| Encapsulado | 64-pin QFN (UP) 9 mm x 9 mm with exposed pad |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant (lead-free variants available) |
| AEC-Q100 | Not qualified |
Guía de configuración de pines de LTC2281CUP 64-pin qfn (up) 9 mm x 9 mm with exposed pad
Configuración de pines para LTC2281CUP (encapsulado 64-pin qfn (up) 9 mm x 9 mm with exposed pad). Este componente analógico presenta pines de entrada, salida y alimentación. Consulte la hoja de datos del fabricante para conocer las configuraciones de los pines de ajuste de offset, compensación y habilitación. Ideal para circuitos de acondicionamiento de señal y amplificadores.
No hay datos detallados de patillaje disponibles para LTC2281CUP.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
LTC2281CUP es adecuado para 6 aplicacións: Cellular Base-Station IF Receiver, Medical Ultrasound Imaging, Industrial Imaging and Machine Vision, Test and Measurement Instrumentation, Software Defined Radio (SDR) Receivers, Multi-Channel Data Acquisition Boards.
Cellular Base-Station IF Receiver
The LTC2281CUP is well-suited to digitizing the IF stages of cellular base-station receivers, where its 82 dB SFDR at Nyquist preserves modulator linearity across the entire 30 MHz LTE bandwidth. Paired with an AD8138 differential driver, the dual channels sample I/Q at 125 Msps simultaneously, achieving the dynamic range required for 3GPP error-vector-magnitude (EVM) targets under multi-carrier loading. Compared to a 12/14-bit ADC running at 80 Msps, this part delivers the same dual-channel throughput at lower cost, suitable for macro-cell receiver chain. The 61.6 dB SNR satisfies the noise-figure budget for QPSK through 16-QAM modulations.
Recomendado
Medical Ultrasound Imaging
In medical ultrasound, the LTC2281CUP is used per channel to digitize returning acoustic echoes at baseband to intermediate frequency, where the 125 Msps dual-channel throughput supports 64-element phased-array beam-formers. Its 61.6 dB SNR allows dynamic-range budgets to be met at depths up to 15 cm, while the 82 dB SFDR prevents harmonic artefacts from interfering with adjacent tissue contrast. Compared to discrete 10-bit ADCs, the LTC2281CUP's pipelined structure maintains pipeline latency consistency across channels, ensuring beam-steering mathematics remain phase-coherent. The internal reference and small 64-QFN footprint simplify multi-channel board layout.
Recomendado
Industrial Imaging and Machine Vision
For industrial machine-vision cameras and inspection systems, the LTC2281CUP digitizes the analog output of line-scan or area-array image sensors, supporting line rates above 100 kHz. The dual-channel architecture is useful for stereo vision or RGB/YCC simultaneous capture, where the 10-bit depth preserves subtle shading transitions critical for defect classification. Internal 2.5V reference stabilizes gain across the inspection system, eliminating the warm-up drift of external references. Its 64-QFN footprint integrates neatly into CoaXPress or GigE-Vision camera boards.
Recomendado
Test and Measurement Instrumentation
Test-and-measurement digitizer boards benefit from the LTC2281CUP's 82 dB SFDR, which dominates harmonic distortion in spectrum-analyzer and oscilloscope IF paths. At 125 Msps dual channel, two ADC inputs capture time-interleaved oscilloscope channels without the bandwidth penalty of mechanical relays. Compared to 8-bit alternatives the LTC2281CUP delivers 4 dB more dynamic range for cable-reach fade measurements, while 3V AVDD enables portable battery-powered bench tools. The exposed pad simplifies thermal management in densely populated PXI/cPCI modules.
Recomendado
Software Defined Radio (SDR) Receivers
The LTC2281CUP performs baseband or low-IF digitization in SDR platforms where its dual channels enable direct I/Q sampling at 125 Msps. At ~470 mW total, it fits battery-powered handheld SDRs while preserving dynamic range for narrow-band signal detection below the noise floor. The 61.6 dB SNR sustains 9 effective ENOBs, well above the 7-8 ENOB threshold typical of demodulator algorithms. Compared to audio CODEC ADCs, the LTC2281CUP reaches far higher sample rates needed for wide-bandwidth SDR captures.
Recomendado
Multi-Channel Data Acquisition Boards
Multi-channel DAQ systems rely on the LTC2281CUP's dual-channel density to scale 16- or 32-channel boards without exceeding the carrier-board's power budget. Per the datasheet, each part draws ~235 mW per channel, summing to manageable thermal density even with 4 parts in close proximity. The exposed pad allows heat to flow into the carrier's ground plane, keeping junction rises below 20C. Compared to discrete single-channel ADCs the LTC2281CUP halves the FPGA I/O pin count and reduces trace-congestion on the digital routing layer.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para LTC2281CUP — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | LTC2281IUP | LTC2285CUP | LTC2283CUP | LTC2280CUP | LTC2286CUP |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 64-QFN (UP) 9x9 | 64-QFN (UP) 9x9 - same | 64-QFN (UP) 9x9 - same | 64-QFN (UP) 9x9 - same | 64-QFN (UP) 9x9 - same | 64-QFN (UP) 9x9 - same |
| Resolution (bits) | 10 | 10 | 14 | 12 | 10 | 14 |
| Sampling Rate (Msps) | 125 | 125 | 125 | 125 | 105 | 80 |
| SNR at Nyquist (dB) | 61.6 | 61.6 | 73.0 | 67.0 | 61.6 | 75.0 |
| SFDR at Nyquist (dB) | 82 | 82 | 85 | 82 | 82 | 90 |
| Supply Voltage (V) | 3 | 3 | 3 | 3 | 3 | 3 |
| Operating Temperature Range | 0C to +70C | -40C to +85C | 0C to +70C | 0C to +70C | 0C to +70C | 0C to +70C |
Diferenciadores clave
- Drop-in dual-channel 64-QFN pinout across the LTC2281/2283/2285/2286 family (frente a LTC2285CUP)
- Lowest cost/performance position in the ADI 125 Msps 64-QFN family (frente a LTC2285CUP)
- Specified at -3 dBFS 82 dBc SFDR at Nyquist input (frente a LTC2280CUP)
Notas de diseño
The 64-QFN exposed pad is the primary thermal and ground-return path. Per the LTC2281 datasheet, the PCB land pattern must include at least 8 thermal vias under the pad, stitched to a continuous ground plane on inner layers. Without sufficient vias, junction temperature can rise above spec, triggering built-in thermal shutdown or shift in ADC linearity. A solid top-layer copper pour of at least 25 sq mm surrounding the package further reduces ground-bounce and digital-coupling noise.
Route the 14-bit CMOS output bus with 50 ohm controlled-impedance traces and add 22 ohm damping resistors close to the LTC2281CUP outputs to dampen capacitive ringing. Keep digital traces routed on opposite layers from the analog input network, separated by a continuous ground plane to provide 60-80 dB isolation. According to the datasheet, switching output currents exceeding 10 mA total per bit edge event can couple to analog inputs without proper separation, degrading SNR by up to 8 dB.
AVDD analog supply must be decoupled with a 10 uF tantalum + 0.1 uF X7R ceramic pair within 5 mm of each supply pin, plus a 100 nF high-frequency X7R per pin. The OVDD digital supply shares the ferrite bead-isolated branch and requires its own 0.1 uF per-pin bypass. A common-board star-grounding topology prevents load-current spikes from generating AVDD droop. Per the datasheet, AVDD noise above 30 mV peak-peak couples directly through the input network into spurious-tone generation.
Do not drive the analog inputs beyond 1.2 or 2 Vp-p full scale while the LTC2281CUP is in shutdown mode. The input ESD structure does not clamp inputs above AVDD + 0.3 V; inrush currents can latch up the device. Per the datasheet, drive an idle-mode external buffer to bias inputs when not in use. Also avoid floating REFH pins even when using the internal reference - the 0.1 uF ceramic bypass cap is required for stable conversion at 125 Msps.
Información de cumplimiento
RoHS-compliant and lead-free. Not AEC-Q100 qualified (commercial grade only). Datasheet reference: LTC2281 datasheet 2281fb.pdf on analog.com.
