TSA5059ATS datasheet(9/24 Pages) PHILIPS

9 / 24 page

2000 Oct 24

Philips Semiconductors

Product speciﬁcation

2.7 GHz I2C-bus controlled low phase

noise frequency synthesizer

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

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)

000022 MHz

2 MHz

4 MHz

000141 MHz

1 MHz

2 MHz

00108500 kHz

500 kHz

1 MHz

001116

250 kHz

500 kHz

010032

125 kHz

250 kHz

010164

62.5 kHz

125 kHz

0110128

31.25 kHz

62.5 kHz

0111256

15.625 kHz

31.25 kHz

100024

166.67 kHz

333.33 kHz

10015800 kHz

800 kHz

1.6 MHz

101010

400 kHz

800 kHz

101120

200 kHz

400 kHz

110040

100 kHz

200 kHz

110180

50 kHz

100 kHz

1110160

25 kHz

50 kHz

1111320

12.5 kHz

25 kHz

Icp (µA) (absolute value)

MIN.

TYP.

MAX.

100

135

170

210

280

350

450

600

750

920

1230

1540

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