TSA5060A 查看數據表（PDF） - Philips Electronics

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TSA5060A

1.3 GHz I2C-bus controlled low phase noise frequency synthesizer

Philips Electronics 

Philips Semiconductors

1.3 GHz I2C-bus controlled low phase

noise frequency synthesizer

Product specification

TSA5060A

APPLICATION INFORMATION

An example of a typical application is given in Fig.4. In this application the VCO centre frequency is 600 MHz with a slope

of 18 MHz/V. The expected loop bandwidth is 13 kHz with a charge pump current of 1230 µA and a comparison

frequency of 166.67 kHz. Filter components need to be adapted to each application depending on the VCO

characteristics and the required performance of the loop.

handbook, full pagewidth

47 nF

33 V

5V

10 kΩ

180 pF

27 kΩ

CP

4 MHz 18 pF XTAL 1

2

XT/COMP

3

AS

4

SDA

5

SCL

6

MICRO-

CONTROLLER

P3

7

P2

8

DRIVE

16

15 GND

14 RFB

13 RFA

TSA5060A 12 VCC

ADC

11

10 P0

P1

9

BC847

1 kΩ

1.8 nF

tuning

voltage

1 nF

1 nF

10 nF

VCO

output

VCO

FCE719

Fig.4 Typical application.

Loop bandwidth

Most of the applications that the TSA5060A are dedicated

for require a large loop bandwidth, in the order of a

few kHz to a few tens of kHz. The calculation of the loop

filter elements has to be done for each application, while it

depends on the VCO slope and phase noise, as well as the

reference frequency and charge pump current.

A simulation of the loop can easily be done by using the

SIMPATA software from Philips.

Reference source

The TSA5060A is well suited to be used with a 4 MHz

crystal connected to pin XTAL. Philips crystal ordering

code 4322 143 04093 is recommended in this case.

It is however possible to use a crystal with a higher

frequency (up to 16 MHz) to improve the noise

performance. When choosing a crystal, care should be

taken to select a crystal able to withstand the drive level of

the TSA5060A without suffering from accelerated ageing.

It is also possible to feed pin XTAL with an external signal

between 2 and 20 MHz, coming from an external oscillator

or from the pin XT/COMP of another TSA5060A, when

more than one synthesizer is present in the same

application. The application given in Fig.5 should then be

used.

If the signal at pin XT/COMP is not used in an application,

the output should be switched off (bits XCE = 0, XCS = 0).

This pin should then be left open.

2000 Oct 24

15

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