XRD8775AIU - 8-Bit 20MSPS Flash ADC, 20-SSOP | MaxLinear
N.º de pieza: XRD8775AIU ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $8.5 | $8,50 |
| 10 | $7.65 | $76,50 |
| 100 | $6.8 | $680,00 |
| 500 | $5.95 | $2.975,00 |
| 1.000 | $5.2 | $5.200,00 |
XRD8775AIU Descripción general
An 8-bit flash ADC is a parallel-architecture converter that uses 2^N-1 comparators to digitize an analog input in a single clock cycle, delivering the fastest conversion latency of any ADC topology at the cost of exponential die-area growth with resolution. Flash converters therefore dominate sub-10-bit, multi-MHz applications such as video digitizers, digital oscilloscope front ends, and radar IF samplers where latency and sampling rate, not resolution, are the primary constraints.
Key specifications of the XRD8775AIU include 8-bit resolution, 20 MSPS maximum sampling rate, internal S/H, single +5 V supply operation, 75 mW typical power dissipation, latch-up-free CMOS construction, and 2000 V minimum ESD protection. The parallel data interface simplifies connection to FPGAs, ASICs, or microcontrollers without requiring a serial programming sequence. The 20-SSOP package suits space-constrained boards where analog and digital grounds can be partitioned for noise immunity.
Architecturally, the device uses 255 parallel latched comparators feeding a priority encoder that generates an 8-bit thermometric code, then a binary encoder delivers the output word in a single clock edge. The internal sample-and-hold amplifier stabilizes the input within the aperture window, which is critical for full-scale inputs above 10 MHz to avoid code-edge distortion. The reference ladder is externally driven, giving the designer freedom to set the LSB size by scaling VREF between 1 V and VDD.
Typical applications include digital oscilloscope input channels, video digitizers, CCD imaging front ends, radar IF sampling, ultrasound beamforming pre-processors, and industrial data-acquisition front ends. The 75 mW dissipation also suits portable test gear and battery-powered instrumentation where the internal S/H eliminates an external track-and-hold IC.
Design tip: Place a 0.1 uF ceramic decoupling capacitor within 5 mm of the VDD pin and a bulk 10 uF tantalum capacitor near the analog ground island; route the 8-bit parallel bus with matched trace lengths to prevent sub-LSB timing skew at the full 20 MSPS rate. Also bypass the external VREF pin with 10 uF to keep the internal resistor ladder stable and reduce sparkle-code errors.
This page synthesizes distributor pricing, verified drop-in 8-bit flash ADC alternatives, and practical PCB layout guidance that goes beyond the manufacturer datasheet, helping engineers shorten the BOM-sourcing and design-in cycle for this legacy flash converter.
Alternativas directas para XRD8775AIU — 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 XRD8775AIU (mismo factor de forma y huella) — difiere en Architecture, Resolution, Data Interface, ESD Protection, Input Type.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
XRD8775AIU-F
✅ Sustitución directa✓ En stock
$4.5 / unidad
Ver hoja de datos →MAX1285BCSA
✅ Sustitución directa✓ En stock
$5.4 / unidad
Ver hoja de datos →TLC549CD
✅ Sustitución directa✓ En stock
$1.02 / unidad
Ver hoja de datos →XRD8775AIU Valores máximos y características eléctricas
| Resolución | 8 bit |
| Frecuencia de muestreo | 20 MSPS (max) |
| Architecture | Flash (parallel comparator) |
| Number of Channels | 1 |
| Data Interface | Parallel |
| Supply Voltage (VDD) | 5 V (single supply) |
| Analog Input Range (VIN) | 0 V to VDD |
| Reference Voltage Range (VREF) | 1 V to VDD |
| Power Dissipation | 75 mW typ. (excluding reference current) |
| Internal Sample-and-Hold | Yes |
| ESD Protection | 2000 V minimum |
| Latch-Up | Latch-up free CMOS |
| Temperatura de funcionamiento | -40 C to +85 C |
| Encapsulado / Carcasa | 20-SSOP (5.30 mm body width) |
| Packaging | Tube |
| Tipo de montaje | Surface Mount |
Configuración de pines de XRD8775AIU
| Pin 1 | VIN — Analog input (0 V to VDD) |
| Pin 2 | D0 (LSB) — Parallel data output bit 0 (LSB) |
| Pin 3 | D1 — Parallel data output bit 1 |
| Pin 4 | D2 — Parallel data output bit 2 |
| Pin 5 | D3 — Parallel data output bit 3 |
| Pin 6 | D4 — Parallel data output bit 4 |
| Pin 7 | D5 — Parallel data output bit 5 |
| Pin 8 | D6 — Parallel data output bit 6 |
| Pin 9 | D7 (MSB) — Parallel data output bit 7 (MSB) |
| Pin 10 | DGND — Digital ground |
| Pin 11 | CLK — Conversion clock input |
| Pin 12 | OE — Output enable (active low) |
| Pin 13 | VREF — External reference voltage input (1 V to VDD) |
| Pin 14 | REFT — Reference ladder top (bypass to AGND) |
| Pin 15 | REFM — Reference ladder mid (bypass to AGND) |
| Pin 16 | REFB — Reference ladder bottom (bypass to AGND) |
| Pin 17 | AGND — Analog ground |
| Pin 18 | NC — Not connected (per datasheet) |
| Pin 19 | NC — Not connected (per datasheet) |
| Pin 20 | VDD — +5 V supply |
Aplicaciones típicas
XRD8775AIU es adecuado para 7 aplicacións: Digital Oscilloscope Input Channel, Video Digitizer Front End, Radar IF Sampler, CCD Imaging Front End, Ultrasound Beamforming Pre-Processor, Industrial Data Acquisition Front End, Battery-Powered Test Instrumentation.
Digital Oscilloscope Input Channel
The XRD8775AIU serves as the front-end digitizer for 8-bit oscilloscope input channels. Its 20 MSPS sampling rate and internal sample-and-hold eliminate the need for an external track-and-hold IC, while the parallel 8-bit output streams directly into an FPGA capture buffer. Low 75 mW dissipation per channel keeps multi-channel scope thermal budgets manageable, and the SSOP-20 footprint allows dense channel replication across 4 to 8 channels on a single acquisition board.
Recomendado
Video Digitizer Front End
The XRD8775AIU is well suited to standard-definition video digitizer boards and undersampled HD capture. Its 20 MSPS rate allows direct sampling of 13.5 MHz pixel-rate SD streams or undersampling of HD video at the 27 MHz clock edge. The internal S/H simplifies the analog front end by eliminating an external track-and-hold amplifier, and the parallel bus connects directly to FPGA video pipelines without protocol overhead.
Recomendado
Radar IF Sampler
The XRD8775AIU's flash architecture and 20 MSPS rate make it suitable for digitizing intermediate-frequency radar signals in the 5 to 10 MHz band. Single-cycle latency preserves phase information critical to Doppler processing, and the internal S/H stabilizes the input within the aperture window. Each IF channel can be allocated one XRD8775AIU plus an FPGA FFT engine for real-time spectrum analysis.
Recomendado
CCD Imaging Front End
Scientific and machine-vision CCD cameras use the XRD8775AIU as the high-speed analog front-end digitizer. The 20 MSPS sampling rate captures 1k to 2k pixel-row CCD outputs without bottleneck, while the parallel interface streams pixel data directly into an FPGA timing generator. The 5 V single-supply operation simplifies power tree design in mobile imaging carts and laboratory instruments.
Recomendado
Ultrasound Beamforming Pre-Processor
Medical and industrial ultrasound arrays use the XRD8775AIU per-channel to digitize pre-beamformed RF signals at 20 MSPS. The single-cycle latency preserves timing relationships essential to beamforming, and the 75 mW dissipation per channel keeps 64- to 128-element arrays within practical thermal envelopes. The internal S/H also tightens aperture jitter compared with external track-and-hold chains.
Recomendado
Industrial Data Acquisition Front End
Industrial DAQ systems embed the XRD8775AIU at the analog input stage for fast transient capture. The 20 MSPS rate captures switching events, motor back-EMF pulses, and sensor edges that slower SAR ADCs would miss. The parallel interface mates directly with industrial FPGAs running custom DSP pipelines, and the SSOP-20 footprint supports dense analog front-end layouts with separate analog and digital ground islands.
Recomendado
Battery-Powered Test Instrumentation
Portable test instruments such as handheld oscilloscopes, logic analyzer probes, and field-service signal tracers leverage the XRD8775AIU's 75 mW dissipation for battery-friendly operation. The single +5 V supply simplifies power tree design in compact handheld enclosures, and the 20 MSPS rate is sufficient for most field-service measurement tasks. The internal S/H reduces external component count, improving overall BOM cost and assembly yield.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para XRD8775AIU — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | XRD8775AIU-F | MAX1285BCSA | TLC549CD |
|---|---|---|---|---|
| Package | 20-SSOP | 20-SSOP - same | 20-SSOP - same | SOIC-8 (Site MPN family; smaller footprint, verify pin map) |
| Brand | MaxLinear | MaxLinear | Analog Devices | Texas Instruments |
| Resolution | 8 bit | 8 bit | 12 bit | 8 bit |
| Architecture | Flash | Flash | SAR | SAR |
| Internal S/H | Yes | Yes | No (SAR inherent) | No (SAR inherent) |
| Data Interface | Parallel | Parallel | Serial (SPI/QSPI/MICROWIRE) | Serial (SPI/QSPI/MICROWIRE) |
Diferenciadores clave
- Integrated sample-and-hold amplifier (frente a TLC549CD)
- 20 MSPS flash architecture for single-cycle latency (frente a MAX1285BCSA)
- Parallel data interface simplifies FPGA connection (frente a MAX1285BCSA)
Notas de diseño
The XRD8775AIU draws 75 mW typical at full 20 MSPS, so a 0.1 uF ceramic decoupling capacitor placed within 5 mm of the VDD pin and a bulk 10 uF tantalum capacitor near the analog ground island are mandatory. The reference ladder (REFT/REFM/REFB) draws 5-15 mW from VREF and must be bypassed independently with a 10 uF low-ESR ceramic to keep the LSB size stable and suppress sparkle-code errors. Use a ferrite bead between analog and digital VDD rails if the source is a switching regulator.
Route the 8-bit parallel data bus with matched trace lengths (skew within 1 ns for the 20 MSPS rate) and keep the digital bus on the opposite side of the ground plane from the analog input. Place the analog input trace in a guarded microstrip configuration with the AGND guard trace to reduce crosstalk from the parallel bus. Maintain a continuous ground plane under the SSOP-20 footprint to control reference ladder return paths.
Do not exceed 20 MSPS clock frequency - metastability and code-edge errors rise rapidly above the rated rate. Ensure the output-enable (OE) signal is held low during conversion to avoid bus contention on the parallel outputs. Always drive VREF from a low-noise source; noise on VREF directly translates to sparkle codes on the output. When migrating from tube to tape-and-reel (XRD8775AIU-F), verify reel orientation matches the pick-and-place feeder requirement.
Información de cumplimiento
RoHS, REACH, halogen-free, and conflict-minerals status not published in available distributor datasheets; designers should request the latest material declaration from MaxLinear for EU end products. Not AEC-Q100 qualified - this part targets industrial/commercial test instrumentation.
