SN761681

www.ti.com FEATURES Single-Chip Mixer/Oscillator and PLL Synthesizer Three-Band Local Oscillator I2C Bus Protocol (Bidirectional Data Transmission) 30-V Tuning Voltage Output Four NPN-Type Band-Switch Drivers Programmable Reference Divider Ratio (512, 640, or 1024 ) 5-V Power Supply 30-Pin TSSOP Package APPLICATIONS TV VCR/DVD Recorder Set-Top Box DESCRIPTION The SN761681 is a synthesized tuner IC designed for 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 counter and reference divider are controlled by I2C bus protocol. Tuning step frequency is selectable by this reference divider ratio for a crystal oscillator. SN761681 TV TUNER IC SLES165 – DECEMBER 2005 DBT PACKAGE (TOP VIEW) VHI OSC C VHI OSC B OSC GND VLO OSC C VLO OSC B UHF OSC B1 UHF OSC C1 UHF OSC C2 UHF OSC B2 IF GND VCC IF OUT1 IF OUT2 CP VTU 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 30 UHF RF IN2 29 UHF RF IN1 28 VHF RF IN 27 RF GND 26 MIX OUT2 25 MIX OUT1 24 BS4 23 BS2 22 BS1 21 BS3 20 ADC 19 AS 18 SDA 17 SCL 16 XTAL P0038-01 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Pro...