SN761644

SN761644 www.ti.com DIGITAL TV TUNER IC Check for Samples: SN761644 SLES252 – NOVEMBER 2009 FEATURES 1 Integrated Mixer/Oscillator/PLL and IF GCA Mirror Pin Package of SN761640 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) BS4 UHF RF IN1 UHF RF IN2 VHI RF IN VLO RF IN RF GND MIX OUT2 MIX OUT1 IF IN RF AGC OUT RF AGC BUF BS3 BS2 BS1 SDA SCL AS BUS GND P5/ADC XTAL OUT XTAL2 XTAL1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 44 VLO OSCB 43 VLO OSC C 42 VHI OSC B 41 VHI OSC C 40 UHF OSC B1 39 UHF OSC C1 38 UHF OSC C2 37 UHF OSC B2 36 OSC GND 35 CP 34 VTU 33 IF GND 32 AIF OUT 31 DIF OUT1 30 DIF OUT2 29 IF GCA CTRL 28 VCC 27 IF GCA IN1 26 IF GCA IN2 25 IF GCA GND 24 IF GCA OUT2 23 IF GCA OUT1 DESCRIPTION The SN761644 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. The SN761644 is ava...