GM6535 データシートの表示（PDF） - Hyundai Micro Electronics

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GM6535

60 MHz Universal Programmable Dual PLL Frequency synthesizer

Hyundai Micro Electronics 

POWER SAVING OPERATION

This PLL has a programmable power-saving

scheme. The transmit counter, receive counter 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.

The output pins TxPS/fTx and RxPS/fRx output the

GM6535

status of the internal power saving setting. If the bit

TxPD enable is set high (transmit counter is set to

power-down mode), then the TxPS/fTx pin will also

output a high state. This TxPS/fTx output can control

an external power switch to switch off the

transmitter, as shown in Figure 17. This scheme

can be applied to the RxPS/fRx output to control the

receiver power saving operation as required.

Power Supply

UNIVERSAL DUAL PLL

VDD

TxPS/fTx

POWER SWITCH

FOR TRANSMITTER

Q Tx Power-Down

Enable Flag

Tx Divider chain Counter, Phase Detector

TX

Power

AMP

RxPS/fRx

To control

The Receiver

Power Switch

VDD

Q Rx Power-Down

Enable Flag

Rx Divider chain Counter, Phase Detector

Figure 17. TxPS/fTx and RxPS/fRx Outputs to Control Power Switches

of the Transmitter and Receiver

13

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