STB4395 datasheet(15/16 Pages) STMICROELECTRONICS

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9 - APPLICATIONS

9.1 - Typical DC connection schemes

9.1.1 - Internal Regulator

The STB4395 has built-in internal regulators which

allows 15mA to be used for external circuitry. The

output of this regulator is -2.85V with respect to the

positive supply rail.

9.1.2 - External Regulator

The STB4395 will always generate its own supply

voltage(-2.85V with respect to VP), but the I/O

interfaces allow the STB4395 to swing its output

levels to the supply rails (VP to VN). The system and

baseband controller can therefore be connected

from the same -unregulated- supply and be indi-

vidually regulated, if required .

9.2 - Application Circuits

9.2.1 - Introduction

The STB4395 makes use of some unusual circuit

configurations :

- The STB4395 operatesfrom positive ground. The

decoupling of the supply lines should take into

account that the a.c. ground connections will be

reversed with respect to the baseband circuit

and/or the microcontroller. The use of multilayer

PCB is recommended.

- The filters have been adapted for the best per-

formance of the IC, although standard configura-

tions are also considered.

9.2.2 - Fully Configured Applications Example

Figure 3 is a typical application circuit for a com-

plete system. It shows the typical external compo-

nents to the circuit. As the reactance of the

components is critical in many locations, the use of

surface mounted componentsis essential. Atypical

component list is also attached. It also shows the

typical values for the the various VCO circuits.The

values are very dependent on layout.

C3 3

10n F

R1 2k

Ω

56 pF

5 6pF

56p F

C1 0

56 pF

R2 2k

Ω

R4 2 k

Ω

R7 2 k

Ω

2 6

2 7

2 8

2 9

C1 7

100 nF

C16

2-6p F

C18 20 0nF

L3 1 5n H

L2 1 5n H

R12 50

Ω

C1 9

8.2 nF

C15

82n F

µH

R6 0

Ω

R5 0

Ω

R3 0

Ω

R1 1 6. 8k

Ω

R10 6. 8k

Ω

R9 6.8 k

Ω

0pF

C1 2

30 0p F

C1 3

30 0p F

0p F

0pF

C1 4

30 0p F

C1 1

10n F

R13

5 .1k

Ω

L1 330

µH

µF

100 nF

C2 2

10 0n F

C26

56 0pF

C3 4

10n F

C3 2

C38

10 0nF

R1 8

Ω

L10

8n H

8nH

10 nH

L11

10n H

R21

0 -10k

Ω

8. 2nH

C24 0pF

R15 2k

Ω

C3 7

2-6p F

L17 47 nH

C3 6

5. 6nF

C40

5 6nF

R2 5

L18 47 nH

100

Ω

R24

5 .1k

Ω

C4 6

100 nF

2-50 pF

C44

82 0pF

R26

10 k

Ω

L22

µH

C47

100 nF

C48

47p F

L23

µH

C49

47p F

C42

2 -50p F

C4 5

82 0pF

C4 3

1n F

L19

12 00n H

L21 3 90 nH

L20 3 90 nH

R2 3

L16 2 70 nH

L15 2 70 nH

Ω

L13 7 50 nH

L14 7 50 nH

8n H

8nH

C2 7

0pF

R17

Ω

Approx value s of b uried trac k

indu cta nc e s to grou nd

C28

68p F

R1 9

27k

Ω

R2 0

27k

Ω

C3 1

20 pF

L12

µH

C35

1 00p F

C28

68p F

C3 9

2-50 pF

R22

10k

Ω

33n F

C20

R14

5 .1k

Ω

C21

47n F

C23

4.7 pF

C2 5

10 0nF

C16 , C15, C1 9, C21 , C23, C4 1, C45

provision for co nn e ction to grou nd a lso

SAW

8 66MHz

Ω

300

Ω

SAW

15 0.4 MHz

STB4395A

TQFP 64

(from above)

R16 4 .7k

Ω

C29

100 nF

NVBAT

VRD

NPRGE N

PRGCLK

PRGD

NTXEN

LOCK

REFIQ

FSH

RSSI

SYNCLK

C41

Ω

Figure 3

STB4395

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