SN761681 Datasheet, PDF (1/20 Pages) Texas Instruments – TV TUNER IC

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FEATURES
• Single-Chip Mixer/Oscillator and 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 )
• 5-V Power Supply
• 30-Pin TSSOP Package
APPLICATIONS
• TV
• VCR/DVD Recorder
• Set-Top Box
DESCRIPTION
The SN761681 is a synthesized tuner IC designed for
TV tuning systems. The circuit consists of a PLL
synthesizer, three-band local oscillator and mixer,
30-V output tuning amplifier, four NPN band-switch
drivers, and 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.
SN761681
TV TUNER IC
SLES165 – DECEMBER 2005
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 OUT1 12
IF OUT2 13
CP 14
VTU 15
30 UHF RF IN2
29 UHF RF IN1
28 VHF RF IN
27 RF GND
26 MIX OUT2
25 MIX OUT1
24 BS4
23 BS2
22 BS1
21 BS3
20 ADC
19 AS
18 SDA
17 SCL
16 XTAL
P0038-01
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 © 2005, Texas Instruments Incorporated