TSA5060AT PHILIPS [NXP Semiconductors], TSA5060AT Datasheet - Page 9

• Manufacturer Part Number: TSA5060AT
• Description: 1.3 GHz I2C-bus controlled low phase noise frequency synthesizer
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
Reference divider ratio
The reference divider ratio is set by 4 bits in the WRITE
mode, giving 16 different ratios. This allows the
comparison frequency to be adjusted to different values,
depending on the compromise which has to be found
between step size and phase noise.
Table 8 Reference dividing ratios
Note
1. Only valid when the IC is used with a 4 MHz crystal.
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 I
byte 4; see Table 9.
Table 9 Charge pump current
2000 Oct 24
1.3 GHz I
noise frequency synthesizer
R3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
C1
0
0
1
1
R2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
2
C-bus controlled low phase
R1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
C0
0
1
0
1
R0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
RATIO
128
256
160
320
16
32
64
24
10
20
40
80
2
4
8
5
MIN.
100
210
450
920
FREQUENCY
COMPARISON
15.625 kHz
166.67 kHz
31.25 kHz
62.5 kHz
12.5 kHz
500 kHz
250 kHz
125 kHz
800 kHz
400 kHz
200 kHz
100 kHz
50 kHz
25 kHz
2 MHz
1 MHz
9
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
(1)
I
cp
( A) (absolute value)
1230
TYP.
135
280
600
BIT PE = 0
15.625 kHz
166.67 kHz
31.25 kHz
62.5 kHz
12.5 kHz
500 kHz
250 kHz
125 kHz
800 kHz
400 kHz
200 kHz
100 kHz
50 kHz
25 kHz
2 MHz
1 MHz
(1)
STEP
Product specification
TSA5060A
BIT PE = 1
333.33 kHz
31.25 kHz
62.5 kHz
MAX.
1540
1.6 MHz
500 kHz
250 kHz
125 kHz
800 kHz
400 kHz
200 kHz
100 kHz
50 kHz
25 kHz
170
350
750
4 MHz
2 MHz
1 MHz
1
6
MHz.
(1)
2
C-bus