SN761642

SN761642 www.ti.com................................................................................................................................................................................................. SLES249 – AUGUST 2009 DIGITAL TV TUNER IC FEATURES 1 Integrated Mixer/Oscillator/PLL VHF-L, VHF-H, UHF 3-Band Local Oscillator RF AGC Detector Circuit I2C Bus Protocol Bidirectional Data Transmission High-Voltage Tuning Voltage Output Four NPN-Type Band Switch Drivers One Auxiliary Port/5-Level ADC Crystal Oscillator Output Programmable Reference Divider Ratio (24/28/32/64/80/128) Selectable Digital IFOUT and Analog IFOUT Standby Mode 5-V Power Supply 38-Pin Thin Shrink Small-Outline Package (TSSOP) APPLICATIONS Digital TVs Digital CATVs Set-Top Boxes DBT PACKAGE (TOP VIEW) VLO OSC B VLO OSC C VHI OSC B VHI OSC C UHF OSC B1 UHF OSC C1 UHF OSC C2 UHF OSC B2 OSC GND CP VTU IF GND DIF OUT1 DIF OUT2 AIF OUT P5/ADC VCC XTAL1 XTAL2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 38 BS4 37 UHF RF IN1 36 UHF RF IN2 35 VHI RF IN 34 VLO RF IN 33 RF GND 32 MIX OUT2 31 MIX OUT1 30 IF IN 29 RF AGC OUT 28 RF AGC BUF 27 BS3 26 BS2 25 BS1 24 SDA 23 SCL 22 AS 21 BUS GND 20 XTAL OUT DESCRIPTION The SN761642 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, and RF AGC detector circuit. The SN761642 is available in a small-outline packa...