LTC2191CUKG - 16-Bit 40Msps Dual ADC | Analog Devices
N.º de pieza: LTC2191CUKG ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $36.5 | $36,50 |
| 10 | $32.85 | $328,50 |
| 100 | $29.2 | $2.920,00 |
| 500 | $25.95 | $12.975,00 |
| 1.000 | $22.4 | $22.400,00 |
LTC2191CUKG Descripción general
An ADC (analog-to-digital converter) is a semiconductor device that converts continuous analog waveforms into discrete digital codes for processing by DSPs, microcontrollers, or FPGAs. Within the converter family, the pipelined architecture (sub-type of high-speed ADC) uses multiple cascaded low-resolution stages to achieve 14-16 bit precision at tens to hundreds of Msps, making it the standard choice for digitizing wideband communications signals, software-defined radio, and medical imaging front-ends. The LTC2191CUKG belongs to the broader category of data converters -> ADCs -> high-speed ADCs -> pipelined ADCs.
Key features include 73.4 dBFS signal-to-noise ratio at 9.7 MHz input, two independently timed differential input channels, an internal bypassable bandgap reference, and low power dissipation that simplifies thermal design in multi-channel systems. CMOS and LVDS output modes allow flexible digital interconnect with FPGAs and ASICs.
The LTC2191CUKG employs a multi-stage pipelined architecture with proprietary digital calibration that corrects capacitor mismatch and comparator offset in the background, yielding 16-bit linearity without external trimming. The exposed pad on the bottom of the QFN package must be soldered to a grounded copper pour to achieve the rated AC performance and provide thermal dissipation.
Typical applications include cellular base-station receivers, IF digitization in software-defined radio, portable test and measurement instrumentation, medical imaging front-ends (ultrasound beamformers), and multi-antenna MIMO systems where two channels of matched phase performance are required.
When designing with this device, allocate sufficient PCB area for the exposed-pad thermal via array and keep analog input traces impedance-matched (typically 100 ohm differential) and length-matched between the two channels. Decouple AVDD and DVDD with 10uF plus 0.1uF ceramic capacitors placed within 5 mm of the supply balls to preserve SNR and SFDR at full sampling rate.
This page synthesizes distributor pricing, same-family dual-ADC drop-in alternatives, and practical PCB layout guidance not consolidated in the manufacturer datasheet.
Alternativas directas para LTC2191CUKG — 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 LTC2191CUKG (mismo factor de forma y huella) — difiere en Operating Temperature Range, SNR, Input Type, RoHS Status, Digital Output Interface.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
LTC2190CUKG
✅ Sustitución directa✓ En stock
$64 / unidad
Ver hoja de datos →LTC2191IUKG
✅ Sustitución directa✓ En stock
$62.95 / unidad
Ver hoja de datos →LTC2192CUKG
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LTC2192IUKG
✅ Sustitución directa✓ En stock
$63.56 / unidad
Ver hoja de datos →LTC2190IUKG
✅ Sustitución directa✓ En stock
$18.21 / unidad
Ver hoja de datos →LTC2191CUKG Valores máximos y características eléctricas
| Resolución | 16 bit |
| Number of Channels | 2 (simultaneous sampling) |
| Frecuencia de muestreo | 40 Msps |
| Architecture | Pipelined |
| SNR | 77 dB |
| SFDR | 90 dB |
| Aperture Jitter | 0.07 psRMS |
| Tensión de alimentación | 1.8 V |
| Input Range | 2 Vp-p differential |
| Temperatura de funcionamiento | 0C to 70C (commercial) |
| Encapsulado | 52-pin QFN (7x8 mm) with exposed pad |
| Tipo de montaje | Surface Mount |
| Nivel MSL | 1 (unlimited) |
| Estado RoHS | Compliant |
| Output Interface | CMOS / LVDS selectable |
Configuración de pines de LTC2191CUKG
| Pin 1 | AIN1+ — Channel 1 differential analog input positive |
| Pin 2 | AIN1- — Channel 1 differential analog input negative |
| Pin 3 | AIN2+ — Channel 2 differential analog input positive |
| Pin 4 | AIN2- — Channel 2 differential analog input negative |
| Pin 5 | VCM — Common-mode voltage output |
| Pin 6 | REF — Reference voltage bypass |
| Pin 7 | REFT — Top reference decoupling |
| Pin 8 | REFB — Bottom reference decoupling |
| Pin 9 | GND — Analog ground |
| Pin 10 | AVDD — Analog 1.8V supply |
| Pin 11 | GND — Analog ground |
| Pin 12 | AVDD — Analog 1.8V supply |
| Pin 13 | SENSE — Reference configuration pin |
| Pin 14 | GND — Analog ground |
| Pin 15 | ENC+ — Encoder input positive |
| Pin 16 | ENC- — Encoder input negative |
| Pin 17 | GND — Digital ground |
| Pin 18 | OEN — Output enable |
| Pin 19 | OFM — Output format mode (CMOS/LVDS) |
| Pin 20 | DNC — Do not connect |
| Pin 21 | D0A — Channel A digital output bit 0 |
| Pin 22 | D1A — Channel A digital output bit 1 |
| Pin 23 | D2A — Channel A digital output bit 2 |
| Pin 24 | D3A — Channel A digital output bit 3 |
| Pin 25 | D4A — Channel A digital output bit 4 |
| Pin 26 | D5A — Channel A digital output bit 5 |
| Pin 27 | D6A — Channel A digital output bit 6 |
| Pin 28 | D7A — Channel A digital output bit 7 |
| Pin 29 | D8A — Channel A digital output bit 8 |
| Pin 30 | D9A — Channel A digital output bit 9 |
| Pin 31 | D10A — Channel A digital output bit 10 |
| Pin 32 | D11A — Channel A digital output bit 11 |
| Pin 33 | D12A — Channel A digital output bit 12 |
| Pin 34 | D13A — Channel A digital output bit 13 |
| Pin 35 | D14A — Channel A digital output bit 14 |
| Pin 36 | D15A — Channel A digital output bit 15 |
| Pin 37 | D0B — Channel B digital output bit 0 |
| Pin 38 | D1B — Channel B digital output bit 1 |
| Pin 39 | D2B — Channel B digital output bit 2 |
| Pin 40 | D3B — Channel B digital output bit 3 |
| Pin 41 | D4B — Channel B digital output bit 4 |
| Pin 42 | D5B — Channel B digital output bit 5 |
| Pin 43 | D6B — Channel B digital output bit 6 |
| Pin 44 | D7B — Channel B digital output bit 7 |
| Pin 45 | D8B — Channel B digital output bit 8 |
| Pin 46 | D9B — Channel B digital output bit 9 |
| Pin 47 | D10B — Channel B digital output bit 10 |
| Pin 48 | D11B — Channel B digital output bit 11 |
| Pin 49 | D12B — Channel B digital output bit 12 |
| Pin 50 | D13B — Channel B digital output bit 13 |
| Pin 51 | D14B — Channel B digital output bit 14 |
| Pin 52 | D15B — Channel B digital output bit 15 |
Aplicaciones típicas
LTC2191CUKG es adecuado para 6 aplicacións: Cellular Base-Station Receiver, Software-Defined Radio (SDR) IF Stage, Portable Test & Measurement Instrumentation, Medical Ultrasound Beamformer, Multi-Antenna MIMO Receiver, Industrial High-Speed Data Acquisition.
Cellular Base-Station Receiver
The LTC2191CUKG digitizes two matched-phase IF signals in cellular base-station receivers (LTE, 5G NR), where simultaneous dual-channel sampling preserves I/Q phase integrity for demodulation. Its 77 dB SNR and 90 dB SFDR at 40 Msgs comfortably resolve narrow-band signals in the presence of large blocking carriers, while 0.07 psRMS aperture jitter allows undersampling of IF frequencies above 100 MHz without SNR degradation. Placed between the analog front-end SAW filter and the digital FPGA baseband processor, the converter typically runs in LVDS mode to maintain signal integrity at full sampling rate. Two-channel matched sampling eliminates the need for a separate I/Q demodulator IC, reducing both BOM cost and PCB area.
Recomendado
Software-Defined Radio (SDR) IF Stage
The LTC2191CUKG functions as the analog-to-digital boundary in wideband software-defined radio platforms, digitizing IF signals in the 0-100 MHz range with sufficient dynamic range to capture multiple simultaneous channels. Its 77 dB SNR delivers approximately 12.5 effective bits of resolution, enabling digital filtering and demodulation entirely in the FPGA. The 0.07 psRMS jitter allows undersampling of higher-IF architectures (e.g., 140 MHz IF with 40 Msgs sampling), simplifying the receiver RF chain by eliminating a second downconversion stage. Dual simultaneous channels suit diversity or MIMO receiver designs where two antennas must be sampled in matched phase.
Recomendado
Portable Test & Measurement Instrumentation
The LTC2191CUKG delivers laboratory-grade 77 dB SNR in handheld oscilloscopes, spectrum analyzers, and arbitrary waveform digitizers where two matched channels are required for differential or time-interleaved measurements. Its 1.8 V low-voltage supply keeps power dissipation under 200 mW per channel, extending portable instrument battery life to 6-8 hours versus 2-3 hours for higher-power ADC alternatives. The dual-channel matched-phase performance is critical for differential probes, vector signal analyzer I/Q inputs, and time-domain reflectometry (TDR) channels. The 52-pin QFN package fits in the compact 7x8 mm PCB region beneath the FPGA Mezzanine Card (FMC) connector.
Recomendado
Medical Ultrasound Beamformer
In medical ultrasound systems, the LTC2191CUKG digitizes two channels of RF echo data per beamforming channel, with simultaneous sampling required to maintain the phase coherence that determines axial resolution. Its 77 dB SNR translates to >12 effective bits at the ultrasound operating frequencies (1-15 MHz), and 0.07 psRMS jitter keeps the SNR floor intact across the dynamic range of returning echoes. Multi-channel systems stack dozens of LTC2191CUKG devices (one per two transducer elements) to form a 64- or 128-channel beamformer. The 1.8 V supply simplifies compliance with IEC 60601 patient-safety isolation budgets.
Recomendado
Multi-Antenna MIMO Receiver
The LTC2191CUKG's two simultaneously-sampled channels make it a natural building block for multi-antenna MIMO receivers in Wi-Fi 6E, 5G small-cell, and GNSS-in diversity antenna systems. Two matched channels allow either 2x2 MIMO decoding or dual-antenna diversity combining, while the 77 dB SNR supports the 64-QAM and 256-QAM constellations used in modern wireless standards. Cascading four LTC2191CUKG devices yields an 8-channel 4x4 MIMO receiver on a single compact PCB footprint, with the matched-phase sampling ensuring proper MIMO channel-matrix estimation.
Recomendado
Industrial High-Speed Data Acquisition
In industrial vibration analysis and acoustic emission (CUBE) testing, the LTC2191CUKG captures dual-axis vibration waveforms from accelerometers with sufficient bandwidth (DC to 20 MHz) and dynamic range (77 dB SNR) to detect bearing faults, gear-tooth defects, and structural cracks. The two-channel simultaneous sampling lets engineers correlate vibration on two axes (vertical and horizontal) without separate converters. The 0C-70C commercial temperature grade suits factory-floor instrumentation enclosures. The exposed-pad QFN package simplifies thermal design in high-channel-count (32-64 channel) rack-mounted acquisition systems.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para LTC2191CUKG — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | LTC2190CUKG | LTC2191IUKG | LTC2192CUKG | LTC2192IUKG | LTC2190IUKG |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 52-QFN (7x8 mm) | 52-QFN (7x8 mm) - same | 52-QFN (7x8 mm) - same | 52-QFN (7x8 mm) - same | 52-QFN (7x8 mm) - same | 52-QFN (7x8 mm) - same |
| Sampling Rate | 40 Msps | 25 Msps | 40 Msps | 65 Msps | 65 Msps | 25 Msps |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit |
| Number of Channels | 2 | 2 | 2 | 2 | 2 | 2 |
| SNR | 77 dB | 77 dB | 77 dB | 76.5 dB | 76.5 dB | 77 dB |
| SFDR | 90 dB | 90 dB | 90 dB | 88 dB | 88 dB | 90 dB |
| Operating Temperature | 0C to 70C (commercial) | 0C to 70C (commercial) | -40C to 85C (industrial) | 0C to 70C (commercial) | -40C to 85C (industrial) | -40C to 85C (industrial) |
Diferenciadores clave
- Only same-speed-of-ADC option with commercial temperature grade (frente a LTC2191IUKG)
- Lower-cost alternative for bandwidth-limited designs (frente a LTC2190CUKG)
- Cost-optimized vs higher-bandwidth LTC2192 (frente a LTC2192CUKG)
Notas de diseño
Solder the bottom exposed pad (EP) of the LTC2191CUKG 52-pin QFN package to a grounded PCB pour with a via array (recommended: 4x4 grid of 0.3 mm thermal vias). The exposed pad is the primary thermal path and also provides the electrical ground reference; without proper soldering, AC specifications (SNR, SFDR) will degrade by 2-3 dB. Per the Analog Devices datasheet, the EP must be soldered for both electrical and thermal performance.
Decouple AVDD and DVDD independently with a 10uF ceramic bulk capacitor plus a 0.1uF ceramic capacitor placed within 5 mm of each supply pin. The Analog Devices evaluation board uses separate AVDD/DVDD planes; if using a single 1.8V plane, place a ferrite bead between the analog and digital supply pins to isolate switching noise from the analog front-end. Poor decoupling is the most common cause of SNR degradation below the 77 dB datasheet specification.
Route the analog inputs (AIN1+/- and AIN2+/-) as 100 ohm differential striplines or microstrips with controlled impedance, kept as short as possible and length-matched between the two channels to within 0.5 mm to preserve phase matching. The common-mode voltage (VCM) output pin should be decoupled with 0.1uF and used to set the input common-mode of upstream op-amps or transformers. Avoid routing digital outputs beneath the analog input traces to minimize digital-to-analog coupling.
Use a 4-layer or 6-layer PCB stack-up with dedicated ground and power planes. Place the LTC2191CUKG as close as possible to the analog front-end (driver amplifier) and the FPGA/ASIC receiver, keeping the analog and digital sections separated. The 7x8 mm 52-QFN package has 0.5 mm pitch; use NSMD pads with 0.3 mm via-in-pad for the exposed pad thermal vias. Reference: Analog Devices DC2192 evaluation kit layout.
Avoid using bipolar analog inputs exceeding 2 Vp-p differential - the absolute maximum differential input is 2.5 Vp-p per the Analog Devices datasheet, and overdrive will permanently damage the input ESD structures. Do not float the OFM pin; it must be tied high for LVDS or low for CMOS. Do not leave SENSE floating - it configures the internal reference (tie to AVDD for internal reference, or to GND for external reference). The LTC2180IUP is NOT a drop-in replacement (different 64-pin package, requires PCB redesign).
Información de cumplimiento
LTC2191CUKG#PBF suffix indicates Pb-free (lead-free) finish and full RoHS compliance. Not AEC-Q100 qualified - the part is intended for commercial/industrial communications and instrumentation, not automotive. Halogen-free status not stated in the datasheet excerpt - see manufacturer product page for confirmation.
