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| 型號： | U2305B-AFSG3 |
| 英文描述： | VHF/ UHF-Tuner-IC |
| 中文描述： | 甚高頻/超高頻調(diào)諧器集成電路 |
| 文件頁數(shù)： | 1/8頁 |
| 文件大?。?/td> | 200K |
| 代理商： | U2305B-AFSG3 |
U2305B
TELEFUNKEN Semiconductors
Rev. A1, 10-Sep-96
1 (8)
Preliminary Information
VHF/ UHF-Tuner-IC
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
5 V supply voltage
Frequency range from 48 to 860 MHz
Band A: balanced high impedance mixer input and
amplitude controlled oscillator
Band B + C: balanced low impedance mixer input and
symmetrical oscillator
Balanced L. O.-outputs for prescalers or PLL
SAW filter driver with low impedance output
Voltage regulator for stable operating characteristics
ESD protection on all pins except oscillator pins and
RF-inputs
Benefits
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
2
8 10 9 11
4
6
5
7
19
3
1
Osc. A
Osc. B
Osc. C
Band-Switch
Voltage-
Stabilizer
12
27
28
L.O.
17
18
Mixer-Output
SAW-Driver
13
14
Band C
RF
Band B
Band A
25
24
23
22
26
21
20
16 15
12504
Figure 1. Block diagram
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