STB4395 Datasheet, PDF (15/16 Pages) STMicroelectronics – CT2 RECEIVER/TRANSMITTER

STB4395
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
Figure 3
configurations :
- The STB4395operatesfrom 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 dependenton layout.
NVBAT
VRD
NPRGE N
P R GC LK
P RG D
NTXEN
LOC K
I
RE FIQ
Q
FN
EN
DO
FSH
RSS I
5 0Ω
S AW
8 66MHz
L1 330 µH
VP
C3
C6
C9
10µF 1 00 nF 100 nF
VN
VN
C1
56 pF
C4
5 6pF
C7
56p F
C1 0
56 pF
L4
56 µH
R15 2kΩ
C24 0pF
3 00Ω
R1 8
5Ω
L7 L8
10 nH 8nH
L10 L11
8n H 10n H
R21
0 -10kΩ
L14 7 50 nH
L16 2 70 nH
R2 3
20 Ω
C2 2
10 0n F
VN
L5
8. 2nH
C26
56 0pF
R16 4 .7kΩ
C29
1 00 nF
VN
L15 2 70 nH
L13 7 50 nH
VN
64 63 62 61 6 0 5 9 5 8 5 7 5 6 5 5 5 4 5 3 5 2 51 50 49
S AW
15 0.4 MHz
L21 3 90 nH
1
R1 2kΩ
2
R2 2kΩ
3
R4 2 kΩ
4
R7 2 kΩ
5
R6 0Ω
R11 6. 8kΩ
6
R5 0Ω
R10 6. 8kΩ
7
R3 0Ω
R9 6.8 kΩ
8
C2
C5
C8
C1 2
C1 3
C1 4
0pF
0p F
0pF
30 0p F 30 0p F 30 0p F
9
10
S TB 4 3 9 5 A
TQFP 64
(from above)
48 VN
47
46
L19
12 00n H
C4 3
1n F
L20 3 90 nH
45
44
C42
2 -50p F
43
C3 4
C4 5
82 0pF
42
1 0n F
41
C41
2-50 pF
40
C3 3
39
C44
1kΩ _{82 0pF}
1kΩ
10n F
C48
4 7p F
R26
10 kΩ
L23
10 µH
C49
4 7p F
L22
10 µH
C47
100 nF
S YNCLK
R8
51 Ω
C1 1
10n F
R12 50Ω
C1 7
L3 1 5n H ^{100 nF}
L2 1 5n H
11
C18 20 0nF
12
13
14
C16
2-6p F
15
38
10n F
C3 2
37
C38
36
10 0nF
L17 47 nH
35
C3 7
2-6p F
34
R2 5
100 Ω
L18 47 nH
16
33
R13
5 .1kΩ
C15
82n F
C1 9
8.2 nF
C16 , C15, C19, C21 , C23, C41, C45
provision for co nn ection to grou nd also
17 18 19 20 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 30 31 32
C20
3 3n F
C28
L6
8nH
C2 7
0 pF
L9 68p F
8n H
R1 9
27kΩ
R14
5 .1kΩ
C21
4 7n F
C23
4.7 pF
R17
2 0Ω
C2 5
10 0nF
Approx value s of b uried trac k
indu ctanc es to grou nd
R2 0
27kΩ
C28
6 8p F
R22
1 0kΩ
C3 6
5. 6nF
R24
5 .1kΩ
C40
5 6nF
C3 1
20 pF
C4 6
VN
1 00 nF
L12
56 µH
C35
1 00p F
C3 9
2-50 pF
15/16