SN761677DA

调谐器 TV/VCR Tuner IC With DC/DC Converter 38-TSSOP -20 to 85

DESCRIPON

The SN761677 is a single-chip synthesized tuner IC designed for TV/VCR tuning systems. The  circuit consists of a PLL synthesizer, 3-band local oscillators and mixer, 30-V dc/dc  converter for tuning the amplifier, four NPN emitter follower band drivers, four NPN open  collector ports, and is available in a small package outline. The 15-bit programmable counter  and reference divider are controlled by I2C bus control. Tuning step frequency is selectable  by the reference divider ratio for a 4-MHz Xtal oscillator.

FEATURES

● Single Chip Mixer/Oscillator, Synthesizer, and 30-V DC/DC Converter for Tuning Amplifier

● VHF-L, VHF-H, UHF 3-Band Local Oscillator

● I2C Bus Protocol

● Four Data Bytes Transmission

● Low Noise DC/DC Converter

● 4ch NPN Emitter Follower Type Band Switch Drivers

● 4ch NPN Open Collector Type Ports

● Programmable Reference Divider Ratio 31.25 kHz, 50 kHz, or 62 kHz

● 5-V Power Supply

● 38-Pin TSSOP Package