U2300B

TELEFUNKEN Semiconductors U2300B VHF/ UHF-Tuner-IC Description This tuner IC requires a power supply of 12 V and performs 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 economical 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) U2300B TELEFUNKEN Semiconductors Pin Description Osc A, base 1 GND (common) 2 Osc A, coll. 3 Osc B, base 4 Osc B, coll. 5 Osc B, coll. 6 Osc B, base 7 Osc C, base 8 Osc C, coll. 9 Osc C, coll. 10 Osc C, base 11 Band sw. 12 SAWF, out 13 SAWF, out 14 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 20 RF in, C 19 VS 18 Mix out 17 Mix out 16 SAWF, inp. 15 SAWF, inp. 95 10886 Pin 1 2 3 4, 7 5, 6 8, 11 9, 1...