SN761668
www.ti.com ..................................................................................................................................................... SLES199E–JANUARY 2007–REVISED APRIL 2008
DIGITAL TV TUNER IC
1
FEATURES
DBT PACKAGE
(TOP VIEW)
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Integrated Mixer/Oscillator/PLL and IF GCA
VHF-L, VHF-H, UHF 3-Band Local Oscillator
RF AGC Detector Circuit
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44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
VLO OSC B
BS4
2
UHF RF IN1
UHF RF IN2
VHI RF IN
VLO RF IN
RF GND
MIXOUT2
MIXOUT1
IF IN2
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
External 4-Pin IF Filter Between Mixer Output
and IF Amplifier Input
I2C Bus Protocol Bidirectional Data
Transmission
3
4
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5
6
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High-Voltage Tuning Voltage Output
Four NPN-Type Band-Switch Drivers
One Auxiliary Port/5-Level ADC
Crystal Oscillator Output
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
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IF IN1
RF AGC OUT
RF AGC FIL
BS3
IF OUT1
Programmable Reference Divider Ratio
(24/28/50/64/80/128)
IF OUT2
CP
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Low Distortion IF Gain Controlled Amplifier
Standby Mode
VTU
BS2
VCC
BS1
5-V Power Supply
SDA
IF GCA IN1
IF GCA IN2
IF GCA CTRL
IF GCA GND
IF GCA OUT2
IF GCA OUT1
P5/ADC
SCL
44-Pin Thin Shrink Small-Outline Package
(TSSOP)
AS
BUS GND
XTAL OUT
XTAL2
APPLICATIONS
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Digital TVs
Digital CATVs
Set-Top Boxes
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.
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.