SN761640

SN761640 www.ti.com .............................................................................................................................................................................................. SLES237 – OCTOBER 2008 DIGITAL TV TUNER IC FEATURES 1 Integrated Mixer/Oscillator/PLL and IF GCA 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) IF GCA Enable/Disable Control Selectable digital IFOUT and Analog IFOUT Standby Mode 5-V Power Supply 44-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 AIF OUT DIF OUT1 DIF OUT2 IFGCA CTRL VCC IF GCA IN1 IF GCA IN2 IF GCA GND IF GCA OUT2 IF GCA OUT1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 44 BS4 43 UHF RF IN1 42 UHF RF IN2 41 VHI RF IN 40 VLO RF IN 39 RF GND 38 MIX OUT2 37 MIX OUT1 36 IF IN 35 RF AGC OUT 34 RF AGC BUF 33 BS3 32 BS2 31 BS1 30 SDA 29 SCL 28 AS 27 BUS GND 26 P5/ADC 25 XTAL OUT 24 XTAL2 23 XTAL1 DESCRIPTION The SN761640 is a low-phase-noise synthesized tuner IC designed for digital TV tuning systems. The circuit consists of a PLL syn...