SN761677

www.ti.com SN761677 SLES066A – DECEMBER 2002 TV/VCR TUNER IC WITH DC/DC CONVERTER FEATURES D Single Chip Mixer/Oscillator, Synthesizer, and 30-V DC/DC Converter for Tuning Amplifier D VHF-L, VHF-H, UHF 3-Band Local Oscillator D I2C Bus Protocol D Four Data Bytes Transmission D Low Noise DC/DC Converter D 4ch NPN Emitter Follower Type Band Switch Drivers D 4ch NPN Open Collector Type Ports D Programmable Reference Divider Ratio (31.25 kHz, 50 kHz, or 62 kHz) D 5-V Power Supply D 38-Pin TSSOP Package DESCRIPTION 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. DA PACKAGE (TOP VIEW) 38-PIN TSSOP (DA) VLO OSC B VLO OSC C OSC GND VHI OSC B VHI OSC C UHF OSC B1 UHF OSC C1 UHF OSC C2 UHF OSC B2 IF GND IF OUT1 IF OUT2 VCC CP VTU TUVCC(5V) TUGND VDC(DC/DCout) XTAL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 38 UHF RF IN2 37 UHF RF IN1 36 VHF RF IN2 35 VHF RF IN1 34 RF GND 33 MIX OUT2 32 MIX OUT1 31 BS1 30 BS2 29 BS3 28 BS4 27 P5 26 ADC/TEST 25 P6 24 AS 23 SDA 22 SCL 21 P7 20 P8 Please be aware that an important notice...