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PDF U2300B Data sheet ( Hoja de datos )

Número de pieza U2300B
Descripción VHF/UHF-Tuner-IC
Fabricantes TEMIC Semiconductors 
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No Preview Available ! U2300B Hoja de datos, Descripción, Manual

TELEFUNKEN Semiconductors
U2300B
VHF/ UHF-Tuner-IC
Description
This tuner IC requires a power supply of 12 V and per-
forms the function of three separate oscillators and
mixers, SAWF-driver, L.O.-output and tri-state band
switch. Applications are 12 V TV- and VCR-tuners.
Features
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.-output 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
Benefits
D The integration of 3 bands allows to design economi-
cal 3-band tuners
Block Diagram
13
4 65 7
8 10 9 11
19 2
Osc. A
Osc. B
Osc. C
Voltage Stabiliser
Band Switch
L.O.
12
Mixer Output
SAW–Driver
27
28
17
18
14
Band A
25 24
Rev. A1: 16.10.1995
Band B
RF
Band C
23 22 26 21 20
Figure 1. Block diagram
16 15
13
95 10717
1 (8)

1 page




U2300B pdf
TELEFUNKEN Semiconductors
U2300B
Test and Principle Application Circuit
Band C
UHF
Band B
VHFH
Band A
VHFL
I/P 180 o
I/P 180 o
I/P
L.O. 100p
1n 1n 1n 1n 1n 1n
Hybrids 0 / 180 degree
with 50 ohms Z(in)
and 100 ohms (2x50) Z(out)
L6
15p
VS
10n
1n 1n
IF : PC 38.9 MHz
SC 33.4 MHz
100p
L.O.
25 21 17
U2309B
Air Coils 0.6 mm
1
5
enamelled copper wire
L1 8 turns 3.0 mm dia.
L2 3
2.5
1p
L3 3
2.5
L4 3
2.5
TOKO–Coils
L5 12+2 turns
L6 6+6
L1
2p2 2p7
18 2p7 2p2
2p
BB620
L2
68p
1k
82p
BB619
9 13
1p 1p
1p 1p
L3
2k2
100p
L4
18k
18k
10n
18k 8p2 BB515
18k
VT
Figure 1. Test and principle application circuit
The output–voltage of the
IF is calculated back to the
primary coil of L5
1n 15p L5
1n
IF–Out
O/P
VSW
1n
95 10718
PCB for the RthJA-Measurement
R(th) SO28 U2300B
95 10719
Figure 2. PCB for the RthJA-Measurement
Rev. A1: 16.10.1995
5 (8)

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