SN761645

SN761645 www.ti.com DIGITAL TV TUNER IC Check for Samples: SN761645 SLES262 – SEPTEMBER 2010 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 Seven-Step Charge Pump Current Four NPN Emitter-Follower Type Band Switch Drivers One Auxiliary Port/5-Level ADC Programmable Reference Divider Ratio Crystal Oscillator 4-MHz/16-MHz Support Selectable Digital IFOUT and Analog IFOUT Standby Mode 5-V Power Supply 38-Pin TSSOP Package APPLICATIONS Digital TV Digital CATV Set-Top Box VLO OSC VHI OSC UHF OSC1 UHF OSC2 OSC GND CP VTU IF GND AIF OUT DIF OUT1 DIF OUT2 P5/ADC VCC IF GCA IN1 IF GCA IN2 IF GCA CTRL IF GCA GND IF GCA OUT2 IF GCA OUT1 DBT PACKAGE (TOP VIEW) 1 38 2 37 3 36 4 35 5 34 6 33 7 32 8 31 9 30 10 29 11 28 12 27 13 26 14 25 15 24 16 23 17 22 18 21 19 20 BS4 UHF RFIN1 UHF RFIN2 VHI RFIN VLO RFIN RF GND MIXOUT2 MIXOUT1 IFIN BUS GND RF AGC OUT BS3 BS2 BS1 SDA SCL AS XTAL2 XTAL1 DESCRIPTION The SN761645 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, RF AGC detector circuit, and IF gain controlled amplifier, and is available in a small outline package. ORDERING INFORMATION For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web site at www.ti.com. Package drawing...