FUNCTIONAL DESCRIPTION

The VT4T5UF2021 is a combination tuner, demodulator and modulator in one package. This unit is compatible with North American NTSC television broadcast signals. An internal Phase-Locked Loop circuit performs all of the required tuning functions. Digital control information is provided to the unit on I2C serial data bus. The tuner and demodulator blocks are internally connected, providing an IF sample point for test purposes. The modulator has separate video and audio inputs and control connections. This single package configuration is useful when there is no need to manipulate the AGC or IF signals prior to demodulation, and provides for a simplified system design. The RF connectors are mounted on the end of the housing so thatthe smallest possible area is used on the rear panel of the end product.

FEATURES

? Receiving Standard: USA

? Receiving Channels:

– VHF Section

– Low Band – Air: 2 to 6 CATV: (A-8) A-5 to B

– High Band – Air: 7 to 13 CATV: C to W + 11

– UHF Section

– Air: 14 to 69

– CATV: W + 12 to W + 84

? Sending Channels:

– USA Channel 3 and 4

– CH 3: OPEN

– CH 4: GND

? Receiving and Sending System: USA Standard M-System (NTSC)

? Channel Selection System: PLL Tuning

? Detection System: Dummy Synchronization Detection System, Intercarrier Sound Receiving System

? Nominal Input Impedance:

– RF: 75 ?, Unbalanced

– Video: 1 k?, Unbalanced

– Audio: 4.7 ? MIN., Unbalanced

– Control: 30 k? MIN., Unbalanced

? Output Load Impedance:

– RF: 75 ?

– Video: 1 k?

– Audio: 4.7 k?

? Intermediate Frequency:

– Picture: 45.75 MHz

– Sound: 41.25 MHz

? Weight: 72 g ±10 g

? Applicable Standards:

– EIA Standard Number 544

– EIA Standard Number 16A

– FCC Standards

– UL Standard