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SN761681 Dataheets PDF



Part Number SN761681
Manufacturers Texas Instruments
Logo Texas Instruments
Description TV TUNER
Datasheet SN761681 DatasheetSN761681 Datasheet (PDF)

www.ti.com 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, th.

  SN761681   SN761681


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www.ti.com 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 VHI OSC B OSC GND VLO OSC C VLO OSC B UHF OSC B1 UHF OSC C1 UHF OSC C2 UHF OSC B2 IF GND VCC IF OUT1 IF OUT2 CP VTU 1 2 3 4 5 6 7 8 9 10 11 12 13 14 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 SN761681 TV TUNER IC SLES165 – DECEMBER 2005 www.ti.com 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. Functional Block Diagram VLO OSC B VLO OSC C OSC GND VHI OSC B VHI OSC C UHF OSC B1 UHF OSC C1 UHF OSC C2 UHF OSC B2 MIX OUT1 MIX OUT2 VCC VHF-L Osc VHF-H Osc UHF Osc IF Amp VHF RF IN VHF Mixer UHF Mixer UHF RF IN1 UHF RF IN2 RF GND XTAL SCL SDA AS 1/8 Prescaler 1/32, 1/33 Prescaler 15-Bit Counter XTAL Osc 4 MHz 512/640/1024 Divider I2C Bus Interface Phase Detector Charge Pump NPN Band Switch Port 5-Level ADC Op Amp IF OUT1 IF OUT2 IF GND CP VTU ADC BS1 BS2 BS3 BS4 B0089-02 2 www.ti.com TERMINAL NAME ADC AS BS1 BS2 BS3 BS4 CP IF GND IF OUT1 IF OUT2 MIX OUT1 MIX OUT2 OSC GND RF GND SCL SDA UHF OSC B1 UHF OSC B2 UHF OSC C1 UHF OSC C2 UHF RF IN1 UHF RF IN2 VCC VHF RF IN VHI OSC B VHI OSC C VLO OSC B VLO OSC C VTU XTAL NO. 20 19 22 23 21 24 14 10 12 13 25 26 3 27 17 18 6 9 7 8 29 30 11 28 2 1 5 4 15 16 Pin Assignments Pin Description DESCRIPTION ADC input Address selection input Band switch1 output (NPN emitter follower) Band switch2 output (NPN emitter follower) Band switch3 output (NPN emitter follower) Band switch4 output (NPN emitter follower) Charge pump output IF ground IF output IF output Mixer output Mixer output Oscillator ground RF ground Serial clock input Serial data input/output UHF oscillator base1 UHF oscillator base2 UHF oscillator collector1 UHF oscillator collector2 UHF RF input UHF RF input Supply voltage for mixer/oscillator/PLL: 5-V VHF RF input VHF HIGH oscillator base VHF HIGH oscillator collector VHF LOW oscillator base VHF LOW oscillator collector Tuning voltage amplifier output 4-MHz crystal oscillator input 150 kW 20 19 50 kW SN761681 TV TUNER IC SLES165 – DECEMBER 2005 SCHEMATIC Figure 1 Figure 2 Figure 3 Figure 3 Figure 3 Figure 3 Figure 4 Figure 5 Figure 5 Figure 6 Figure 6 Figure 7 Figure 8 Figure 9 Figure 9 Figure 9 Figure 9 Figure 10 Figure 10 Figure 11 Figure 12 Figure 12 Figure 13 Figure 13 Figure 14 Figure 15 Figure 1. S0133-03 S0159-01 Figure 2. 3 SN761681 TV TUNER IC SLES165 – DECEMBER 2005 50 kW 21 22 23 24 S0138-02 Figure 3. 12 13 S0155-01 Figure 5. 17 S0136-03 Figure 7. www.ti.com 14 S0156-01 Figure 4. 25 26 S0160-01 Figure 6. 18 Figure 8. S0133-02 4 www.ti.com 8 9 3 kW 3 kW 7 6 Figure 9. S0130-01 28 S0142-04 Figure 11. 4 5 3 kW 3 kW SN761681 TV TUNER IC SLES165 – DECEMBER 2005 29 30 S0142-05 Figure 10. 1 2 3 kW 3 kW Figure 12. 15 S0129-01 S0129-02 Figure 13. S0157-01 Figure 14. 5 SN761681 TV TUNER IC SLES165 – DECEMBER 2005 16 www.ti.com Figure 15. S0158-01 ABSOLUTE MAXIMUM RATINGS over operating free-air temperature range (unless otherwise noted) (1) Supply voltage, VCC(2) Input voltage 1, VGND(2) Input voltage 2, VVTU(2) Input voltage 3, VIN(2) Continuous total dissipation, PD(3) Operating free-air temperature, TA Storage temperature range, Tstg Maximum junction temperature, TJ Maximum short-circuit time, tSC(max) VCC (Pin 11) RF GND, OSC GND (Pins 3, 27) VTU Other pins (Pins 1, 2, 4–9, 12.


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