SN761677_14 Datasheet, PDF (1/22 Pages) Texas Instruments – TV/VCR TUNER IC WITH DC/DC CONVERTER

www.ti.com
SN761677
SLES066A – DECEMBER 2002
TV/VCR TUNER IC WITH DC/DC CONVERTER
FEATURES
D Single Chip Mixer/Oscillator, Synthesizer, and
30-V DC/DC Converter for Tuning Amplifier
D VHF-L, VHF-H, UHF 3-Band Local Oscillator
D I²C Bus Protocol
D Four Data Bytes Transmission
D Low Noise DC/DC Converter
D 4ch NPN Emitter Follower Type Band Switch
Drivers
D 4ch NPN Open Collector Type Ports
D Programmable Reference Divider Ratio
(31.25 kHz, 50 kHz, or 62 kHz)
D 5-V Power Supply
D 38-Pin TSSOP Package
DESCRIPTION
The SN761677 is a single-chip synthesized tuner IC
designed for TV/VCR tuning systems. The circuit consists
of a PLL synthesizer, 3-band local oscillators and mixer,
30-V dc/dc converter for tuning the amplifier, four NPN
emitter follower band drivers, four NPN open collector
ports, and is available in a small package outline. The
15-bit programmable counter and reference divider are
controlled by I²C bus control. Tuning step frequency is
selectable by the reference divider ratio for a 4-MHz Xtal
oscillator.
DA PACKAGE (TOP VIEW)
38-PIN TSSOP (DA)
VLO OSC B ¹
VLO OSC C ²
OSC GND ³
VHI OSC B ⁴
VHI OSC C 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
VCC ¹³
CP ¹⁴
VTU ¹⁵
TUVCC(5V) ¹⁶
TUGND ¹⁷
VDC(DC/DCout)
18
XTAL ¹⁹
38
UHF RF IN2
37 _{UHF RF IN1}
36 _{VHF RF IN2}
35 VHF RF IN1
34 RF GND
33 MIX OUT2
32 _{MIX OUT1}
31 _BS1
30 _BS2
29 _BS3
28 _BS4
27 _P5
26
ADC/TEST
25 _P6
24 _AS
23 _SDA
22 _SCL
21 _P7
20 _P8
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 Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
Copyright  2002, Texas Instruments Incorporated