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Pico E-15 Hardware Reference
www.picocomputing.com
Pico Computing
(206) 283-2178
150 Nickerson Street. Suite 311
Seattle, WA 98109
18
High Speed Analog to Digital Converters
The Pico E-15 features 2 high speed analog to digital converters. The converters are optimized
for high-frequency, high-performance, low-power, low-noise operation. The converters have
integrated DC blocking capacitors, and thus, cannot be used on very low frequency signals.
The ADC should be driven by a source with an impedance of 50 ohms.
To ensure accuracy at high speeds, the low-jitter 125 MHz reference clock must be used. The
converters may be tuned to different applications. For example: a lower termination impedance
may be traded for more sensitivity. A wider high frequency input range may be traded for less
high frequency noise rejection. Contact Pico Computing with your application requirements.
The data returning from the ADCs must be sampled on the rising edge of the appropriate clock
return pin. Even when the ADCs are clocked from the same source, they will be running out of
sync because of the duty cycle stabilizer (which provides greater resolution). The Pico E-15
can be special ordered with the duty cycle stabilizer perminately disabled.