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參數(shù)資料
| 型號： | 935267009118 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 2700 MHz, PDSO16 |
| 封裝： | 4.40 MM, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 7/27頁 |
| 文件大?。?/td> | 184K |
| 代理商： | 935267009118 |
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2000 Jul 11
15
Philips Semiconductors
Product specication
2.7 GHz I2C-bus controlled low phase
noise frequency synthesizer
TSA5059
APPLICATION INFORMATION
An example of a typical application is given in Fig.4. In this application the VCO centre frequency is 1.5 GHz, with a slope
of 100 MHz/V; the expected loop bandwidth is 10 kHz with a charge pump current of 555
A and fcomp of 250 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
TSA5059
FCE123
1
VT
GND
RFB
RFA
VCC
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
AS
XT/COMP
XTAL
CP
SDA
SCL
P3
P2
P1 P0 ADC
2.2 nF
10 nF
1 nF
3.9 k
2.7 k
5 V
33 V
27 k
18 pF
1 nF
tuning
voltage
VCO
output
VCO
MICRO-
CONTROLLER
47 nF
4 MHz
Fig.4 Typical application.
Loop bandwidth
Most of the applications the TSA5059 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 TSA5059 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 an higher
frequency (up to 16 MHz) to improve the noise
performance. When choosing a crystal, one should take
notice to select a crystal able to withstand the drive level of
the TSA5059 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 TSA5059, when more
than one synthesizer is present in the same application.
Then the application given in Fig.5 should be used.
If the signal at pin XT/COMP is not used in an application,
the output should be switched off (XCE = 0, XCS = 0).
This pin should then be open.
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