TSA5059AT 데이터 시트보기 (PDF) - Philips Electronics

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TSA5059AT

2.7 GHz I2C-bus controlled low phase noise frequency synthesizer

Philips Electronics 

Philips Semiconductors

2.7 GHz I2C-bus controlled low phase

noise frequency synthesizer

Product specification

TSA5059A

handbook, full pagewidth

4 MHz

18 pF

1

16

2

15

3

14

4

13

TSA5059A

5

12

6

11

7

10

8

9

1.0 nF

1.2 kΩ

1

16

2

15

3

14

4

13

TSA5059A

5

12

6

11

7

10

8

9

FCE715

Fig.5 Application for using one crystal with two TSA5059As.

I2C-bus crosstalk

The TSA5059A includes a loop amplifier that requires an

external NPN transistor. Care should be taken in the layout

of the application to ground the emitter of the NPN

transistor as close as possible to the ground of the VCO.

The best way to avoid any I2C-bus crosstalk in the

application (i.e. parasitic coupling between the I2C-bus

lines and the VCO coil) is to avoid the I2C-bus signal to

come in the RF part by using an I2C-bus gate that allows

only the messages for the PLL to go to the PLL and to

avoid unnecessary repeated sending. Such a gate is

integrated in most of the Philips digital demodulators.

2000 Oct 24

16

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