SN761668_15 Datasheet, PDF (1/25 Pages) Texas Instruments – DIGITAL TV TUNER IC

SN761668
www.ti.com ..................................................................................................................................................... SLES199E – JANUARY 2007 – REVISED APRIL 2008
DIGITAL TV TUNER IC
FEATURES
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• 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 1
VLO OSC C ²
VHI OSC B ³
VHI OSC C ⁴
OSC GND ⁵
UHF OSC B1 ⁶
UHF OSC C1 ⁷
UHF OSC C2 ⁸
UHF OSC B2 ⁹
IF GND ¹⁰
IF OUT1 ¹¹
IF OUT2 ¹²
CP ¹³
VTU 14
V
CC
15
IF GCA IN1 ¹⁶
IF GCA IN2 17
IF GCA CTRL 18
IF GCA GND 19
IF GCA OUT2 20
IF GCA OUT1 21
P5/ADC 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.
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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.
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