SN761678B_14 Datasheet, PDF (1/21 Pages) Texas Instruments – TV TUNER IC

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FEATURES
• Single-Chip Mixer/Oscillator and
Phase-Locked Loop (PLL) Synthesizer
• Three-Band Local Oscillator
• I²C Bus Protocol (Bidirectional Data
Transmission)
• 30-V Tuning Voltage Output
• Four NPN-Type Band-Switch Drivers
• Programmable Reference Divider Ratio
(512, 640, or 1024)
• External 4-Pin Intermediate Frequency (IF)
Filter Between Mixer Output and IF Amplifier
Input
• 5-V Power Supply
• 30-Pin Thin Shrink Small-Outline Package
(TSSOP)
APPLICATIONS
• TVs
• VCR/DVD Recorders
• Set-Top Boxes
SN761678B
TV TUNER IC
SLES185 – JUNE 2006
DBT PACKAGE
(TOP VIEW)
VHI OSC C 1
VHI OSC B 2
OSC GND 3
VLO OSC C 4
VLO OSC B 5
UHF OSC B1 6
UHF OSC C1 7
UHF OSC C2 8
UHF OSC B2 9
IF GND 10
VCC 11
IF OUT 12
CP 13
VTU 14
XTAL 15
30 UHF RF IN
29 VHF RF IN
28 BS4
27 RF GND
26 MIX OUT2
25 MIX OUT1
24 IF IN2
23 IF IN1
22 BS2
21 BS1
20 BS3
19 ADC
18 AS
17 SDA
16 SCL
P0038-01
DESCRIPTION
The SN761678B is a synthesized tuner IC designed for TV tuning systems. The circuit consists of a
phase-locked loop (PLL) synthesizer, three-band local oscillator and mixer, 30-V output tuning amplifier, and four
NPN band-switch drivers. The device is available in a small-outline package. A 15-bit programmable counter and
reference divider are controlled by I²C bus protocol. Tuning step frequency is selectable by this reference divider
ratio for a crystal oscillator.
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This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be
more susceptible to damage because very small parametric changes could cause the device not to meet its published
specifications.
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 © 2006, Texas Instruments Incorporated