TSA5059TS datasheet(9/24 Pages) PHILIPS

9 / 24 page

1999 Oct 05

Philips Semiconductors

Preliminary speciﬁcation

2.7 GHz I2C-bus controlled low phase

noise frequency synthesizer

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 1

⁄6 MHz.

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 I2C-bus

byte 4, according to Table 9.

Table 9

Charge pump current

RATIO

COMPARISON

FREQUENCY(1)

STEP

BIT PE = 0(1)

BIT PE = 1(1)

0000

2 MHz

4 MHz

0001

1 MHz

2 MHz

0010

500 kHz

1 MHz

0011

250 kHz

500 kHz

0100

125 kHz

250 kHz

0101

62.5 kHz

125 kHz

0110

128

31.25 kHz

62.5 kHz

0111

256

15.625 kHz

31.25 kHz

1000

166.67 kHz

333.33 kHz

1001

800 kHz

1.6 MHz

1010

400 kHz

800 kHz

1011

200 kHz

400 kHz

1100

100 kHz

200 kHz

1101

50 kHz

100 kHz

1110

160

25 kHz

50 kHz

1111

320

12.5 kHz

25 kHz

Icp (µA) (absolute value)

MIN.

TYP.

MAX.

100

135

170

210

280

350

450

600

750

920

1230

1560

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