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FEATURES

APPLICATIONS

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VLOOSCB

VLOOSCC

OSCGND

VHIOSCB

VHIOSCC

UHFOSCB1

UHFOSCC1

UHFOSCC2

UHFOSCB2

IFGCA IN1

IFGCA IN2

IFGCA CTRL

IFGCA GND

IFGCA OUT2

IFGCA OUT1

IFGND

IFOUT1

IFOUT2

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CC

CP

VTU

P5/ADC

UHFRFIN1

UHFRFIN2

VHIRFIN

VLORFIN

BS4

RFGND

MIXOUT2

MIXOUT1

IFI 2

N

IFIN1

BUSGND

RF AGCOUT

RF AGCFIL

XTAL OUT

XTAL2

XTAL1

BS3

BS2

BS1

SDA

SCL

AS

DBTPACKAGE

(TOP VIEW)

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DESCRIPTION

SN761668

DIGITAL TV TUNER IC

• 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

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)

• Digital TVs

• Digital CATVs

• Set-Top Boxes

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.

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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.

Copyright © 2007–2008, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.