SN761668 Datasheet | Texas Instruments

FEATURES - Integrated Mixer/Oscillator/PLL and IF GCA - VHF-L, VHF-H, UHF 3-Band Local Oscillator - RF AGC Detector Circuit - External 4-Pin IF Filter Between Mixer Output and IF Amplifier Input - 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 (24/28/50/64/80/128) - Low Distortion IF Gain Controlled Amplifier - 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 OSC GND UHF OSC B1 UHF OSC C1 UHF OSC C2 UHF OSC B2 IF GND IF OUT1 IF OUT2 CP VTU V CC IF GCA IN1 IF GCA IN2 IF GCA CTRL IF GCA GND IF GCA OUT2 IF GCA OUT1 P5/ADC 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 MIXOUT2 37 MIXOUT1 36 IF IN2 35 IF IN1 34 RF AGC OUT 33 RF AGC FIL 32 BS3 31 BS2 30 BS1 29 SDA 28 SCL 27 AS 26 BUS GND 25 XTAL OUT 24 XTAL2 23 XTAL1 DESCRIPTION The SN761668 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 SN761668 is available in a small-outline package. 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. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2007- 2008, Texas Instruments Incorporated SLES199E...