RF42/43
Xin pin with an external signal source.
XIN
SDN
I
I
Crystal Oscillator Input. Connect to an external 30 MHz crystal or to an external source. If
using an external clock source with no crystal, dc coupling with a nominal 0.8 VDC level is
recommended with a minimum ac amplitude of 700 mVpp.
25
26
Shutdown input pin. 0–VDD V digital input. SDN should be = 0 in all modes except Shutdown
mode. When SDN =1 the chip will be completely shutdown and the contents of the registers
will be lost.
PADDLE_GND
GND
The exposed metal paddle on the bottom of the RF42/43 supplies the RF and circuit
ground(s) for the entire chip. It is very important that a good solder connection is made
between this exposed metal paddle and the ground plane of the PCB underlying the RF42/43
PKG
109
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