SN761662

Features:

* Low-Phase-Noise Mixer/Oscillator and PLL Synthesizer
* VHF-L, VHF-H, UHF Three-Band Local Oscillator 2
* I C Bus Protocol (Bidirectional Data Transmission)
* 30-V Tuning Voltage Output
* Four NPN-Type Band-Switch Drivers
* One Auxiliary-Port, Five-Level ADC
* RF AGC Detector Circuit
* Crystal Oscillator Output
* Programmable Reference Divider Ratio (24/28/50/64/80/128)
* Standby Mode
* 5-V Power Supply
* 38-Pin TSSOP Package APPLICATIONS
* Digital TV
* Digital CATV
* Set-Top Box


Application




Specifications

		MIN NOMMA	UNIT
Supply voltage, VCC		4.5 5 5.5	V
Tuning supply voltage, VTU		30 33	V
Output current of band switch, IBS	One band switch on	10	mA
Output current of port 5, I		5	mA
Operating free-air temperature, TA		20 85	°C

Description

The SN761662 is a low-phase-noise synthesized tuner IC designed for digital TV tuning systems. The circuit consists of a PLL synthesizer, three-band local
oscillator and mixer, 30-V output tuning amplifier, four NPN band-switch drivers, and is available in a small-outline package. A 15-bit programmable 2
counter and reference divider are controlled by I C bus protocol. Tuning step frequency is selectable by this reference divider ratio for a crystal oscillator.