![](/html/Mitel/1158/page11.png)
VREF
500
500
RF INPUTS
RF inputs
VCC
25K
BIAS
SP5658
VCC
CHARGE
PUMP
200
OS
(Output disable)
DRIVE
OUTPUT
Loop amplifier
PORT/LOCK
Disable, Enable, Data and Clock inputs
VCC
CRYSTAL
Output Ports and Lock Output
Reference oscillator
11
/O
Fig. 10 Input/Output interface circuits