U2305B Datasheet, PDF (5/8 Pages) TEMIC Semiconductors – VHF/ UHF-Tuner-IC

Test and Principle Application Circuit
U2305B
I/P
Band C
UHF
I/P
Band B
VHFH
I/P
Band A
VHFL
180D
180D
Hybrids 0 / 180 degree
with 50 ohms Z(in)
and 100 ohms (2x50) Z(out)
V(b)
10n
L.O.
100p
100p
1n 1n 1n 1n 1n 1n
IF : PC 38.9 MHz
SC 33.4 MHz
L.O.
25
21
17
The output–voltage of the
IF is calculated back to the
U2305B
primary circuit of L5
1
5
9
13
Air Coils 0.6 mm
enamelled copper wire
L1 8 Wdg. 3.0 mm 0 ^1p
L2 3 2.5
L3 3 2.5
L4 3 2.5
2p7
2p2
1p0
1p0
18 _2p2
2p7
L2
1p0 1p0
L3
L6
L6
1n
15p
1n
L5
IF–Out
O/P
2p
TOKO–Coils
L5 t.b.d.
L1
L6 t.b.d.
BB620
68p
BB619
2k2 L4
V(Band)
82p
1k
100p
18k
1n
8p2 BB515
18k
18k
18k
10n
V(Diode)
Figure 2. Test and principle application circuit
PCB for the R_thJA-Measurement
Material: 35 mm one-sided Cu-coated epoxy PCB,
40 mm 40 mm 1.5 mm
95 10719
Figure 3. PCB for the R_thJA-measurement
TELEFUNKEN Semiconductors
5 (8)
Rev. A1, 10-Sep-96
Preliminary Information