TSA5522 datasheet(13/20 Pages) PHILIPS

13 / 20 page

1996 Jan 23

Philips Semiconductors

Product speciﬁcation

1.4 GHz I2C-bus controlled synthesizer

TSA5522

APPLICATION INFORMATION

Tuning ampliﬁer

The tuning amplifier is capable of driving the varicap

voltage without an external transistor. The tuning voltage

output must be connected to an external load of 27 k

Ω

which is connected to the tuning voltage supply rail.

Figure 6 shows a possible loop filter. The component

values depend on the oscillator characteristics and the

selected reference frequency.

Crystal oscillator

The crystal oscillator uses a 4 MHz crystal connected in

series with an 18 pF capacitor thereby operating in the

series resonance mode. Connecting the oscillator to the

supply voltage is preferred, but it can, however, also be

connected to ground.

Fig.6 Typical application (SO16).

handbook, full pagewidth

SCL

SDA

XTAL

33 V

UHF

VHF1

VHF3

12 V

5 V

10 nF

1 nF

RF2

RF1

CC2

CC1

SCL

39 nF

180 nF

SDA

TSA5522T

tune

22 k

Ω

27 k

Ω

4 MHz

18 pF

MLD229

Vtune

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