RF1VU7

The RF1VU7 is a kind of integrated television demodulator assembly designed for use with VTSS-series tuners. RF1VU7 replaces the earlier RIFU0508GEZZ and provides the same functionality in all respects. The input is a standard NTSC 45.75 MHz inverted television IF spectrum, as referenced to the video frequency. The outputs of RF1VU7are demodulated vide (AM) and audio (FM), an AFT signal to indicate the need for tuning correction, and an AGC control line for feedback to the tuner. The device operates from a +9 V source.

There are some features of RF1VU7 as follows: (1)NTSC receiving standard; (2)receiving system: intercarrier sound; (3)intermediate frequency: picture: 45.75 MHz, sound: 41.25 MHz; (4)norminal input impedance: 75 unbalanced type; (5)terminal output voltage: RF AGC: 8.0 V (0 to 8.0 V); AFT: 4.5 V (1 to 8 V); (6)operating voltage: B voltage: 9 V±10%, AFT mute: ON=0.3 V max and OFF=Open; (7)consumed current: 65 mA max; (8)output terminal load condition: video: high-impedance load and audio: 56 k; (9)temperature: storage: -25 to 75, operating: -10 to 60.

The following of RF1VU7 is about the electrical characteristics: (1)differential gain: ±8% typ and ±12% max when stair step, 10 CH, 80% mod, 90 dB; (2)differential phase; ±6°typ and ±10° max when stair step, 10 CH, 80% mod, 90 dB; (3)picture output S/N ratio: 42 dB typ and 41 dB min when weight filter OFF, white level 50%, 90 dB; (4)AFT output voltage operation characteristics: 4.5 V typ and 1.0 to 8.0 V; (5)AFT operation characteristics local oscillator frequency error: ±25 kHz typ and ±50 kHz max ar AFT voltage 4.5 V; (6)picture frequency characteristics 100 kHz to 3 MHz: ±1.5 dB typ and -1±3 dB (max) when multi-burst, 100 kHz standard, 80% mod, 90 dB; (7)picture frequency characteristics 100 kHz to 3 MHz: -3.0 dB typ and -3±4 dB (max) when multi-burst, 100 kHz standard, 80% mod, 90 dB; (8)sound S/N ratio: 50 dB typ and 42 dB min when standard color bar, 85.5% mod, 400 Hz±25 kHz/Dev.