XRD8785AIDTR-F
XRD8785AIDTR-F - 8-Bit 20MSPS Flash ADC, 24-SOIC | MaxLinear
The MaxLinear XRD8785AIDTR-F is an 8-bit flash analog-to-digital converter (ADC) sampling at up to 20 MSPS with a single 5V supply, housed in a 24-pin wide-body SOIC package (0.295 inch / 7.50 mm body width) shipped on tape and reel. Key electrical parameters include 8-bit resolution, 20 MHz maximum sampling rate, one single-ended analog input, internal sample-and-hold (S/H), external or internal reference option, 0V-to-VDD analog input range, 1V-to-VDD reference range, 75 mW typical power consumption (excluding reference), and an operating temperature range of -40C to +85C. The suffix "D" indicates the 24-SOIC package, "T" indicates tape-and-reel packaging, and "R-F" denotes the MaxLinear / Exar part-numbering convention.
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.
USD $3.85
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