器件名称: U2305B
功能描述: VHF/ UHF-Tuner-IC
文件大小: 202.82KB 共8页
简 介:U2305B
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
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 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
D Band B + C: balanced low impedance mixer input and
symmetrical oscillator
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 6 5 7 8 10 9 11 19 2
Osc. A
Osc. B
Osc. C VoltageStabilizer Band-Switch 12
L.O.
27 28
Mixer-Output SAW-Driver
17 18 14
13 RF Band A 25 24 23 Band B 22 26 21 Band C
12504
20
16 15
Figure 1. Block diagram
TELEFUNKEN Semiconductors Rev. A1, 10-Sep-96
1 (8)
Preliminary Information
U2305B
Pin Description
Osc A, base GND (common) Osc A, coll. Osc B, base Osc B, coll. Osc B, coll. Osc B, base Osc C, base Osc C, coll. 1 2 3 4 5 6 7 8 9 28 L.O. out 27 L.O. out 26 GND (RF) 25 RF in, A 24 RF in, A 23 RF in, B 22 RF in, B 21 RF in, C Pin 1 2 3 4, 7 5, 6 8, 11 9, 10 12 13, 14 15, 16 17, 18 19 20, 21 22……
