U2305B Datasheet, PDF (1/8 Pages) TEMIC Semiconductors – VHF/ UHF-Tuner-IC

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
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
1
3
4 657
8 10 9 11
19
2
Osc. A
Osc. B
Osc. C
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
1 (8)
Rev. A1, 10-Sep-96
Preliminary Information