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PDF U2305B Data sheet ( Hoja de datos )
| Número de pieza | U2305B | |
| Descripción | VHF/ UHF-Tuner-IC | |
| Fabricantes | TEMIC Semiconductors | |
| Logotipo |  |
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VHF/ UHF-Tuner-IC
U2305B
Description
This tuner IC requires a power supply of 5 V and performs
the function of three separate oscillators an mixers,
SAWF-driver, L.O.-output and tri-state band switch.
This tuner IC is decigned for high performance tuners for
TV, VCR and PCs.
Features
D 5 V supply voltage
D Frequency range from 48 to 860 MHz
D Band A: balanced high impedance mixer input and
amplitude controlled oscillator
D Band B + C: balanced low impedance mixer input and
symmetrical oscillator
D Balanced L. O.-outputs for prescalers or PLL
D SAW filter driver with low impedance output
D Voltage regulator for stable operating characteristics
D ESD protection on all pins except oscillator pins and
RF-inputs
www.DataSheet4U.com
Benefits
D The integration of 3 bands and the small SSO28
package allows to design very small and economical
3-band tuners with high performance.
Block Diagram
13
4 657
8 10 9 11
Osc. A
Osc. B
Osc. C
19 2
Voltage-
Stabilizer
Band-Switch
12
L.O. 27
28
Mixer-Output
SAW-Driver
17
18
14
Band A
25 24
RF
Band B
Band C
23 22 26 21 20
Figure 1. Block diagram
16 15
13
12504
TELEFUNKEN Semiconductors
Rev. A1, 10-Sep-96
Preliminary Information
1 (8)
1 page  
Test and Principle Application Circuit
U2305B
Band C
UHF
Band B
VHFH
Band A
VHFL
I/P
I/P
I/P
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
15
9 13
Air Coils 0.6 mm
enamelled copper wire
L1 8 Wdg. 3.0 mm 0
L2 3 2.5
L3 3 2.5
L4 3 2.5
1p
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.
L6 t.b.d.
L1
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 RthJA-Measurement
Material: 35 m m one-sided Cu-coated epoxy PCB,
40 mm 40 mm 1.5 mm
95 10719
Figure 3. PCB for the RthJA-measurement
TELEFUNKEN Semiconductors
Rev. A1, 10-Sep-96
Preliminary Information
5 (8)
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet U2305B.PDF ] | |
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