MC145162 Motorola, MC145162 Datasheet - Page 13

• Manufacturer Part Number: MC145162
• Description: 60 MHz and 85 MHz Universal Programmable Dual PLL Frequency Synthesizers
• Manufacturer: Motorola

transmit and receive counters and the reference frequency
counter can be powered down individually by setting the
TxPD enable, RxPD enable, and Ref PD enable bits of the
control register. The functions of the power down control bits
are explained in Table 2 and the programming format is in
Figure 8.
MOTOROLA
This PLL has a programmable power–saving scheme. The
POWER SAVING OPERATION
POWER SUPPLY
POWER
AMP
Tx
Figure 17. TxPS/f Tx and RxPS/f Rx Outputs to Control Power Switches
POWER SWITCH FOR TRANSMITTER
TO CONTROL THE RECEIVER
POWER SWITCH
of the Transmitter and the Receiver
TxPS/f Tx
RxPS/f Rx
UNIVERSAL DUAL PLL
Tx DIVIDER CHAIN COUNTER, PHASE DETECTOR
Rx DIVIDER CHAIN COUNTER, PHASE DETECTOR
the internal power saving setting. If the bit TxPD enable is set
“high” (transmit counter is set to power–down mode), then the
TxPS/f Tx pin will also output a “high” state. This TxPS/f Tx out-
put can control an external power switch to switch off the
transmitter, as shown in Figure 17. This scheme can be
applied to the RxPS/f Rx output to control the receiver power
saving operation as required.
The output pins TxPS/f Tx and RxPS/f Rx output the status of
V DD
V DD
Q
Q
MC145162 MC145162–1
Tx POWER–DOWN
Rx POWER–DOWN
ENABLE FLAG
ENABLE FLAG
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