XRD8785AIDTR-F - 8-Bit 20MSPS Flash ADC, 24-SOIC | MaxLinear
Teilenummer: XRD8785AIDTR-F ✗ Abgekündigt| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $6.42 | $6,42 |
| 10 | $5.78 | $57,80 |
| 100 | $5.12 | $512,00 |
| 500 | $4.4 | $2.200,00 |
| 1.000 | $3.85 | $3.850,00 |
XRD8785AIDTR-F Übersicht
A flash ADC is a type of analog-to-digital converter that uses a parallel bank of 2^n comparators to convert an analog signal to an n-bit digital code in a single clock cycle, achieving the highest sampling speed of any ADC architecture. The hierarchy is: ADC -> data converter -> data acquisition IC -> mixed-signal IC -> semiconductor. Flash converters excel in applications demanding low latency and wide input bandwidth, but they trade resolution and power efficiency against sampling speed. The XRD8785AIDTR-F occupies the entry-level 8-bit, 20 MSPS tier, which is the typical sweet spot for video digitisation, ultrasound receive beams, and intermediate-frequency (IF) sampling in low-cost communications receivers.
Key features of this device include a parallel (TTL-compatible) digital output bus, internal S/H front-end, latch-up free CMOS construction, ESD protection on analog and digital pins, single 5V supply operation, and low power consumption at 75 mW typical. The 24-SOIC wide-body package measures approximately 15.4 mm x 7.5 mm x 2.35 mm, providing generous die-to-board clearance for through-hole or socketed prototypes.
The device is built on a 5V CMOS process, providing low power consumption, latch-up immunity, and ESD protection. Internal reference mode simplifies bill-of-materials, while external reference mode lets designers optimise linearity or temperature drift for instrumentation-grade designs.
Typical applications include video digitisation, digital oscilloscope front-ends, IF sampling in communications receivers, CCD/CMOS image sensor digitisation, and industrial control loop sampling.
When designing with this device, ensure the analog input signal is bandwidth-limited to less than the Nyquist frequency (10 MHz for 20 MSPS) and that the external reference decoupling capacitor is placed within 5 mm of the REF pin to prevent kickback noise from corrupting the conversion.
This page synthesises distributor stock, lifecycle risk, drop-in ADC alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in-Alternativen für XRD8785AIDTR-F – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
Für dieses Produkt sind keine Drop-in-Alternativen verfügbar.
Alternativen anfordernXRD8785AIDTR-F Grenzwerte & elektrische Eigenschaften
| Auflösung | 8 bits |
| Abtastrate | 20 MSPS |
| Number of Inputs | 1 (single-ended) |
| Input Type | Single-Ended |
| Number of A/D Converters | 1 |
| Data Interface | Parallel (TTL) |
| Configuration | S/H-ADC (flash) |
| Reference Type | External or Internal |
| Analog Input Voltage Range | 0 V to VDD |
| Reference Voltage Range | 1 V to VDD |
| Versorgungsspannung | 5 V (single supply) |
| Power Consumption (typ, excl. ref) | 75 mW |
| Betriebstemperatur | -40 C to +85 C |
| Gehäuse / Bauform | 24-SOIC (0.295 in / 7.50 mm width) |
| Packaging | Tape & Reel (TR) |
| Latch-Up / ESD | Latch-up free, ESD protected |
| Process Technology | 5V CMOS |
| Lebenszyklusstatus | Obsolete (EOL) |
XRD8785AIDTR-F 24-soic (0.295 in / 7.50 mm width) Pinbelegungsleitfaden
Pinbelegung für XRD8785AIDTR-F (24-soic (0.295 in / 7.50 mm width)-Gehäuse). Dieses analoge Bauteil verfügt über Eingangs-, Ausgangs- und Versorgungspins. Offset-Null-, Kompensations- und Enable-Pin-Konfigurationen entnehmen Sie dem Herstellerdatenblatt. Ideal für Signalaufbereitung und Verstärkerschaltungen.
Keine detaillierten Pinbelegungsdaten verfügbar für XRD8785AIDTR-F.
Siehe die Datenblatt für die vollständige Pin-Konfiguration.
Typische Anwendungen
XRD8785AIDTR-F ist geeignet für 6 Anwendungs: Composite Video Digitisation, Digital Oscilloscope Front-End, IF Sampling in Communications Receivers, CCD / CMOS Image Sensor Digitisation, Industrial Control Loop Sampling, Ultrasound / Sonar Front-End Sampling.
Composite Video Digitisation
The XRD8785AIDTR-F's 20 MSPS sampling rate and 8-bit resolution make it well suited to composite-video digitisation front-ends in security cameras, broadcast capture cards, and entry-level frame-grabbers. Operating from a single 5V rail with 75 mW typical dissipation, it interfaces directly to an FPGA or set-top-box encoder via its parallel TTL digital bus. The 0V-to-VDD analog input range simplifies analog front-end design: a 1V p-p composite signal biased around 2.5V is captured cleanly with the internal S/H, eliminating an external track-and-hold. Compared with 10-bit video ADCs, the 8-bit depth limits NTSC dynamic range to about 48 dB, but for CCTV and SD-grade capture this is acceptable and saves cost.
Empfohlen
Digital Oscilloscope Front-End
Benchtop and PC-based digital oscilloscopes in the 20-50 MHz bandwidth class rely on 8-bit, 20 MSPS converters for their analog input channel. The XRD8785AIDTR-F's parallel TTL output drops directly into an FPGA capture FIFO, and the 0V-to-VDD input range works with standard +/-5V op-amp attenuator front-ends. The internal S/H eliminates one of the most expensive components in a scope channel, helping deliver a ~$50 BOM per channel. Designers should add 50 ohm termination and an AC-coupled buffer to drive the analog input cleanly; the wide-body 24-SOIC helps heat dissipation when sampling at full 20 MSPS continuously.
Empfohlen
IF Sampling in Communications Receivers
Low-cost narrowband communications receivers often digitise an intermediate-frequency (IF) signal at 10-20 MSPS for digital demodulation. The XRD8785AIDTR-F captures IF frequencies up to ~10 MHz with 8-bit dynamic range, sufficient for AM/FM, narrowband FM, GMSK, and basic OFDM demodulation in software-defined radio (SDR) front-ends. The single 5V supply is convenient in 12V or USB-powered radios, and the 75 mW dissipation allows sealing the converter in a shielded enclosure without thermal concerns. When upgrading an SDR design to 10-12 bits, consider the THS1215IPWG4 from TI in a similar MSOP-28 package, but plan for a PCB rework.
Empfohlen
CCD / CMOS Image Sensor Digitisation
Industrial line-scan and area-scan CCD/CMOS cameras requiring a low-cost digitisation chain often use an 8-bit, 20 MSPS ADC such as the XRD8785AIDTR-F as the analog front-end output stage. The 0V-to-VDD input is well suited to the 0-4V swing of a typical CCD correlated double-sample output, and the parallel output can drive an FPGA-based image pipeline at full pixel rate. Internal S/H simplifies synchronisation between pixel clock and conversion clock. For higher-resolution sensors a 12-14 bit pipeline ADC such as the THS1209CDAG4 gives 4-8 dB of extra dynamic range at the cost of more design complexity.
Empfohlen
Industrial Control Loop Sampling
Motor-control and process-control loops sampling at 1-10 kHz update rates can use the XRD8785AIDTR-F as a high-overhead digitiser, trading 8-bit resolution for guaranteed fast conversion latency and predictable timing. The single 5V supply integrates into industrial PLC backplanes powered by 24V -> 5V DC-DC converters. The parallel output allows tight feedback paths in DSP-based controllers, and the industrial-grade -40C to +85C temperature range is adequate for factory-floor enclosures. The 75 mW dissipation plus a small heatsink keeps the converter cool inside sealed control cabinets.
Empfohlen
Ultrasound / Sonar Front-End Sampling
Low-cost ultrasound and sonar receiver boards use 8-bit, 20 MSPS converters to digitise return signals at 5-15 MHz IF. The XRD8785AIDTR-F's 0V-to-VDD input range suits a log-amplifier output, and the parallel TTL bus feeds directly to an FPGA-based beam-former. The internal S/H is critical for high-frequency input capture, and the wide-body 24-SOIC allows hand-rework on prototype receivers. Pin compatibility with other 8-bit 20 MSPS converters lets designers swap silicon across prototype revisions. For multi-channel sonar arrays a simultaneous-sampling ADC like the THS1209CDAG4 is preferred, but for single-element systems the XRD8785AIDTR-F remains a cost-effective choice.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für XRD8785AIDTR-F – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | MAX1180EAI |
|---|---|---|
| Brand | MaxLinear (Exar) | Maxim Integrated |
| Package | 24-SOIC (wide-body 7.50 mm) | 28-SSOP |
| Resolution | 8 bits | 10 bits |
| Sampling Rate | 20 MSPS | 20 MSPS |
| Supply Voltage | 5 V single supply | 3.3 V (different supply) |
| Input Type | Single-ended | Single-ended |
| Reference | Internal or external | External |
Wichtigste Unterscheidungsmerkmale
- Single 5V supply with internal S/H front-end (vs. Generic 8-bit ADC pairing)
- Flash-architecture latency (vs. Pipelined ADCs)
- Wide-body SOIC package for hand-probing (vs. TSSOP-28 alternatives)
Designhinweise
Estimated: at 5V VDD and 75 mW typical, supply current is roughly 15 mA. Use a linear LDO with at least 1.5x headroom (e.g. LP2985 or LM7805) and place a 100 nF decoupling capacitor within 5 mm of the VDD pin to avoid digital-noise coupling into the analog comparator bank.
Place the analog input trace and the digital output bus on opposite sides of the package, with a continuous ground plane underneath. Keep the analog input impedance matched with a 50 ohm termination resistor and AC-coupling capacitor at the AIN pin. Add a digital ground-return ring around the 24-SOIC to confine switching currents away from the comparator reference ladder.
Do not exceed the 5V supply absolute maximum on VDD or the AIN input. The analog input range is 0V to VDD only - never apply a negative voltage without an AC-coupling capacitor first. Inputs that exceed VDD by more than 0.3 V can permanently damage the input ESD structure, despite the latch-up-free process.
Estimated: at 20 MSPS output bus activity, ground bounce on a poorly-decoupled SOIC can show up as 1-2 LSB of effective aperture jitter. Use series damping resistors (22-33 ohm) on each DBx output line to reduce edge rates, and route outputs as 50 ohm microstrip over the ground plane when driving a downstream FPGA.
Place a 100 nF + 10 uF bypass capacitor pair at the VDD pin, within 2-3 mm. The reference pin requires its own 100 nF + 4.7 uF decoupling network whether using internal or external reference. Keep all analog traces over a single uninterrupted ground plane and never cross digital outputs over the analog input or reference paths.
Compliance-Informationen
RoHS/REACH status not explicitly listed in the verified data reviewed on 2026-10-15; request material declaration from MaxLinear before automotive or EU-market designs.
