AV9155
AV9155 Recommended External Circuit
Notes:
1. ICS recommends the use of an isolated ground plane for the
AV9155.
All grounds shown on this drawing should be
connected to this ground plane. This ground plane should be connected to the system ground plane at a single point. Please
refer to
AV9155
Board Layout Diagram.
2. A single power supply connection for all VDD lines at the 2.2µF decoupling capacitor is recommended to reduce interaction
of analog and digital circuits. The 0.1µF decoupling capacitors should be located as close to each VDD pin as possible.
3. A 33Ω series termination resistor should be used on any clock output which drives more than one load or drives a long trace
Ω
(more than about two inches), especially when using high frequencies (>50 MHz). This termination resistor is put in series with
the clock output line close to the clock output. It helps improve jitter performance and reduce EMI by damping standing waves
caused by impedance mismatches in the output clock circuit trace.
4. The ferrite bead does not enhance the performance of the
AV9155,
but will reduce EMI radiation from the VDD line.
8
ICS [ INTEGRATED CIRCUIT SYSTEMS ]
