4. Input/Output Interface Circuits
4.1
4.2
PDO (Pin 1)
PD (Pin 2)
PDO is the buffer amplifier output of the PLL. The bipolar output stage is a rail-to-rail amplifier.
PD is the current charge pump output of the PLL. The current can be controlled by setting the
appropriate bits. The loop filter has to be designed corresponding to the chosen pump current
and the internal reference frequency. A recommendation can be found in the application circuit.
The charge-pump current can be chosen by setting Bit 71 and B it 70 as follows:
Table 4-1.
Current Charge-pump Output
IPD (μA)
25
100
500
2000
B71
0
0
1
1
B70
0
1
0
1
Figure 4-1.
VS
Internal Components at PDO Connection
VS
VS
PDO
PD
4
ATR4256
4867D–AUDR–01/08
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