Datasheet

AD9244
Rev. C | Page 25 of 36
Reference Decoupling
The VREF pin should be bypassed to the REFGND pin with a
10 μF tantalum capacitor in parallel with a low inductance
0.1 μF ceramic capacitor. It is also necessary to add a capacitor
network to decouple the REFT and REFB pins.
Figure 49 shows
the recommended decoupling networks.
CML
The AD9244 has a midsupply reference point. This is used
within the internal architecture of the AD9244 and must be
decoupled with a 0.1 μF capacitor. It sources or sinks a load of
up to 300 μA. If more current is required, the CML pin should
be buffered with an amplifier.
VR
VR is an internal bias point on the AD9244. It must be
decoupled to AGND with a 0.1 μF capacitor.
AD9244
CML
0.1μF
VR
0.1μF
02404-063
Figure 63. CML/VR Decoupling