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TSA5059T View Datasheet(PDF) - Philips Electronics

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TSA5059T Datasheet PDF : 24 Pages
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Philips Semiconductors
2.7 GHz I2C-bus controlled low phase
noise frequency synthesizer
Preliminary specification
TSA5059
Reference divider ratio
The reference divider ratio is set by 4 bits in the WRITE
mode, giving 16 different ratios which allow to adjust the
comparison frequency to different values, depending on
the compromise which has to be found between step size
and phase noise.
Table 8 shows the different dividing ratios and the
corresponding comparison frequencies and step size,
assuming the device is provided with a 4 MHz signal at
pin XTAL.
The dividing ratio of 24 is implemented to fulfil the UK-DTT
recommendation regarding offset frequency of 16 MHz.
Table 8 Reference dividing ratios
R3
R2
R1
R0 RATIO
COMPARISON
FREQUENCY(1)
0
0
0
0
2
0
0
0
1
4
0
0
1
0
8
0
0
1
1
16
0
1
0
0
32
0
1
0
1
64
0
1
1
0
128
0
1
1
1
256
1
0
0
0
24
1
0
0
1
5
1
0
1
0
10
1
0
1
1
20
1
1
0
0
40
1
1
0
1
80
1
1
1
0
160
1
1
1
1
320
2 MHz
1 MHz
500 kHz
250 kHz
125 kHz
62.5 kHz
31.25 kHz
15.625 kHz
166.67 kHz
800 kHz
400 kHz
200 kHz
100 kHz
50 kHz
25 kHz
12.5 kHz
Note
1. Only valid when the IC is used with a 4 MHz crystal.
BIT PE = 0(1)
2 MHz
1 MHz
500 kHz
250 kHz
125 kHz
62.5 kHz
31.25 kHz
15.625 kHz
166.67 kHz
800 kHz
400 kHz
200 kHz
100 kHz
50 kHz
25 kHz
12.5 kHz
STEP
BIT PE = 1(1)
4 MHz
2 MHz
1 MHz
500 kHz
250 kHz
125 kHz
62.5 kHz
31.25 kHz
333.33 kHz
1.6 MHz
800 kHz
400 kHz
200 kHz
100 kHz
50 kHz
25 kHz
Charge pump current
The charge pump current can be chosen from 4 different values depending on the value of bits C1 and C0 in the I2C-bus
byte 4, according to Table 9.
Table 9 Charge pump current
C1
C0
0
0
0
1
1
0
1
1
MIN.
100
210
450
920
Icp (µA) (absolute value)
TYP.
135
280
600
1 230
MAX.
170
350
750
1 560
1999 Oct 05
9
 

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