TSA5059A データシートの表示（PDF） - Philips Electronics
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TSA5059A Datasheet PDF : 24 Pages
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Philips Semiconductors
2.7 GHz I2C-bus controlled low phase
noise frequency synthesizer
Product specification
TSA5059A
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.
Table 8 Reference dividing ratios
R3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
R2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
R1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
R0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
RATIO
COMPARISON
FREQUENCY(1)
2
2 MHz
4
1 MHz
8
500 kHz
16
250 kHz
32
125 kHz
64
62.5 kHz
128 31.25 kHz
256 15.625 kHz
24
166.67 kHz
5
800 kHz
10
400 kHz
20
200 kHz
40
100 kHz
80
50 kHz
160 25 kHz
320 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
1 540
2000 Oct 24
9
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