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Texas Instruments SN761683BDAR
- Part No.:
- SN761683BDAR
- Manufacturer:
- Texas Instruments
- Category:
- Video Processing
- Package:
- 32-TSSOP (0.240", 6.10mm Width)
- Datasheet:
-
SN761683BDAR.pdf
- Description:
- IC VIDEO TUNER 32TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,804
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Product details
Overview
SN761683BDAR from Texas Instruments is a single-chip synthesized TV tuner IC integrating a three-band local oscillator, mixer, PLL synthesizer, 30-V tuning-voltage amplifier, and four NPN band-switch drivers. It operates from a 5-V supply, supports UHF/VHF-L/VHF-H RF input bands, delivers 43-MHz IF outputs, and communicates via I²C bus. It targets analog TV signal reception in consumer broadcast equipment.
For engineers reviewing the SN761683BDAR datasheet, SN761683BDAR pinout, SN761683BDAR application, or SN761683BDAR equivalent, key selection considerations include its 32-pin TSSOP package, 4-MHz crystal reference, programmable 512/640/1024 reference divider, 15-bit frequency word, and 30-V VTU output for varactor tuning-critical for legacy NTSC/PAL/SECAM tuner designs requiring integrated RF-to-IF conversion.
Technical Context
The SN761683BDAR implements a fully integrated PLL-based frequency synthesis architecture with a 4-MHz crystal oscillator, 1/8 prescaler, 15-bit programmable counter, and selectable reference divider (512/640/1024) to generate VHF-L, VHF-H, and UHF local oscillator signals. Its charge-pump output (CP) drives external loop filters for stable LO generation.
It integrates three independent oscillator/mixer sections-VLO, VHI, and UHF-with dedicated base/collector terminals per band, plus dual IF amplifiers delivering 22–32 dB conversion gain across 55–804 MHz RF inputs. Band switching is controlled via four open-emitter NPN drivers (BS1–BS4), each capable of 10 mA sink current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - powers entire RF/IF/PLL/IO circuitry; requires stable 5-V rail with ≤100 mV ripple |
| Tuning Voltage Output | 0.4 V to 33 V - 30-V range enables full varactor diode biasing for wide-channel UHF/VHF tuning |
| Crystal Frequency | 4 MHz ±0.28 MHz - fixed reference oscillator input; supports standard 4-MHz fundamental-mode crystals |
| I²C Interface Speed | 100 kHz to 400 kHz - compatible with standard-mode and fast-mode I²C controllers for register programming |
| Conversion Gain | 22 dB to 32 dB - measured at 43-MHz IF output; varies by band (e.g., 26 dB typ. at 804 MHz UHF) |
| Noise Figure | 9.5 dB to 11 dB - worst-case at UHF high end; critical for maintaining C/N ratio in weak-signal reception |
| Band-Switch Current | 10 mA per BS port - sufficient to drive discrete NPN band-switch transistors in front-end RF filtering networks |
Pinout & Package
SN761683BDAR is housed in a 32-pin Thin Shrink Small-Outline Package (TSSOP, DA drawing), 7.0 mm × 4.4 mm, 0.65 mm pitch, RoHS-compliant with CU NIPDAU finish and MSL Level-2 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 13) | Power supply input | 5-V main supply for oscillator, mixer, PLL, and I²C interface; requires local 100-nF bypass to IF GND |
| VTU (Pin 15) | Tuning voltage amplifier output | High-voltage (up to 33 V) output driving varactor diodes; isolated from digital ground to prevent noise coupling |
| CP (Pin 14) | Charge-pump output | Current-source/sink node for PLL loop filter; connects to external RC network determining lock time and stability |
| SCL / SDA (Pins 17/18) | I²C serial interface | Standard bidirectional bus pins; require 2.2-kΩ pull-ups to VCC; support address selection via AS pin |
| BS1–BS4 (Pins 22–25) | Band-switch driver outputs | NPN emitter-follower outputs sinking up to 10 mA; control external RF band-select switches (e.g., PIN diodes or MOSFETs) |
| IF OUT1 / IF OUT2 (Pins 11/12) | Intermediate frequency outputs | Differential or single-ended 43-MHz IF signals; typically AC-coupled to SAW filter or IF amplifier stage |
| UHF/VHF RF IN (Pins 29–32, 30, 31) | RF signal inputs | Five dedicated RF ports: VHF-L/H and UHF bands with separate inputs per oscillator section; require 50-Ω matching |
| XTAL (Pin 16) | Cry stal oscillator input | 4-MHz crystal connection point; internal oscillator circuitry requires external 25–300 Ω series resistor per TI layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Three-band integrated oscillator/mixer | Simultaneous VHF-L (45–174 MHz), VHF-H (174–230 MHz), and UHF (470–862 MHz) coverage eliminates need for discrete tuners |
| Programmable reference divider | Selectable 512/640/1024 ratios enable precise channel spacing alignment for NTSC (625 kHz), PAL (500 kHz), and SECAM standards |
| 15-bit frequency word resolution | Supports 32,767 distinct LO frequencies - sufficient for fine-tuning across full broadcast spectrum with <100 Hz step resolution |
| Four NPN band-switch drivers | On-chip drivers reduce BOM count and PCB area; eliminate need for external transistor arrays in multi-band front-end switching |
| 30-V tuning voltage output | Enables direct drive of high-capacitance varactors used in wide-range YIG or ceramic resonator-based tuning circuits |
Applications
| Analog TV Tuner Module | VCR/DVD Recorder Tuner |
|---|---|
|
Use Scenario: Receiving over-the-air NTSC/PAL broadcast signals in CRT-based television sets with analog demodulation. IC Role / Device Role / Timing Role: Primary RF-to-IF converter generating local oscillator signals, mixing incoming RF, and outputting 43-MHz IF for downstream video/audio demodulation. Use Value: Integrates oscillator, mixer, PLL, and band-switch drivers in one 32-pin TSSOP, reducing component count by >15 parts versus discrete solutions. |
Use Scenario: Channel selection and signal downconversion in analog video recorders capturing broadcast TV onto tape or DVD media. IC Role / Device Role / Timing Role: Synthesized tuner providing stable LO injection and IF output synchronized to recording timing clocks and video sync generators. Use Value: 30-V VTU output ensures consistent tuning across temperature; I²C programmability allows firmware-controlled channel scanning and memory recall. |
| Legacy Set-Top Box Tuner | Terrestrial Broadcast Receiver |
|
Use Scenario: Analog signal acquisition in early-generation cable-ready set-top boxes before digital transition. IC Role / Device Role / Timing Role: Front-end tuner IC handling RF filtering, frequency translation, and IF conditioning prior to analog-to-digital conversion or composite output. Use Value: Four BS outputs simplify multi-path RF routing; 43-MHz IF output matches legacy SAW filter standards used in STB IF strips. |
Use Scenario: Fixed-location terrestrial TV reception in rural or low-signal environments using high-gain antennas. IC Role / Device Role / Timing Role: High-sensitivity tuner with 9.5-dB NF (VHF-L) and 25-dB conversion gain enabling reliable reception at –80 dBm input levels. Use Value: Low phase noise (88 dBc/Hz @ 10 kHz offset) preserves signal integrity during long coaxial cable runs and multi-tap distribution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TV tuner IC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN761682BDAR | Same pinout and architecture but lacks UHF OSC C2/B2 pins; supports only two-band (VHF-L/VHF-H) operation | Not suitable for full UHF channel coverage; limited to VHF-only systems like older Japanese NTSC-J TVs | Select SN761682BDAR only if UHF reception is unnecessary and board layout must remain identical. |
| MAX2108ETI+ | 3.3-V CMOS tuner with integrated ADC, digital IF processing, and SPI interface; no analog BS drivers or VTU output | Targets digital TV demodulator SoCs; requires external 3.3-V supply and digital baseband processor integration | Choose MAX2108ETI+ for new digital designs needing software-defined tuning; not a drop-in replacement for SN761683BDAR. |
Compared with SN761682BDAR and MAX2108ETI+, the SN761683BDAR uniquely combines 5-V analog tuner functionality, 30-V VTU, four NPN BS drivers, and full UHF/VHF-L/VHF-H coverage in a single TSSOP package-making it irreplaceable for legacy analog broadcast hardware requiring direct varactor control and discrete band switching.
Availability
SN761683BDAR is available at Aetrix Electronics and suitable for analog TV tuner modules, VCR/DVD recorder designs, and legacy set-top box production requiring stable component supply and long-term lifecycle support.
Supply support for SN761683BDAR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in broadcast and consumer electronics IC design.
The SN761683BDAR belongs to TI's legacy TV tuner product line, engineered specifically for high-performance analog broadcast reception in cost-sensitive consumer devices requiring integrated RF synthesis and IF conversion.
FAQ
What is the operating supply voltage range for the SN761683BDAR?
The SN761683BDAR operates from 4.5 V to 5.5 V DC on the VCC pin (Pin 13). Operation below 4.5 V may cause improper PLL lock or band-switch driver dropout; above 5.5 V risks permanent damage per absolute maximum ratings. A well-regulated 5-V source with ≤100 mV ripple and local 100-nF ceramic bypassing to IF GND is required for stable SN761683BDAR performance.
Does the SN761683BDAR support I²C address configuration?
Yes, the SN761683BDAR supports I²C address selection via the AS pin (Pin 19), which accepts four voltage levels-LOW, MID2, MID1, and HIGH-to configure MA1/MA0 bits and yield up to four unique 7-bit slave addresses. This enables multiple SN761683BDAR devices on the same I²C bus without address conflict, essential for multi-tuner systems.
What is the function of the VTU pin on the SN761683BDAR?
The VTU pin (Pin 15) is the 30-V tuning voltage amplifier output of the SN761683BDAR. It provides a programmable DC bias (0.4 V to 33 V) to varactor diodes in the front-end RF filter and oscillator tank circuits. Its high-voltage capability enables full-channel coverage across UHF and VHF bands without external level-shifting circuitry.
Can the SN761683BDAR be used in modern digital TV applications?
The SN761683BDAR is designed for analog broadcast standards (NTSC/PAL/SECAM) and outputs 43-MHz analog IF signals-not digitized baseband data. While it can feed an external ADC in hybrid systems, it lacks built-in digital demodulation, MPEG processing, or ATSC/DVB compatibility. For modern digital TV, newer silicon tuners like the SN76169x series or MAX21xx family are recommended instead of the SN761683BDAR.
What are the thermal limitations of the SN761683BDAR in continuous operation?
The SN761683BDAR has an operating free-air temperature range of –20°C to +85°C and a maximum junction temperature of 150°C. At TA = 25°C, its continuous power dissipation is 1040 mW; above 25°C, derating is 8.33 mW/°C. Adequate PCB copper area (≥2 cm² thermal pad), airflow, and avoidance of adjacent heat sources are essential to maintain reliability and avoid thermal shutdown of the SN761683BDAR.
SN761683BDAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-TSSOP (0.240", 6.10mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Tuner
- Applications:
- Video Display
- Standards:
- -
- Control Interface:
- I2C
- Voltage - Supply:
- 4.5V ~ 5.5V
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 32-TSSOP
SN761683BDAR FAQ
1.How can I place an order for SN761683BDAR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN761683BDAR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN761683BDAR reliable?
The price and inventory of SN761683BDAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN761683BDAR is usually 5 days.
3.What payment methods are accepted for SN761683BDAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN761683BDAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN761683BDAR?
SN761683BDAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN761683BDAR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN761683BDAR?
For technical support, including SN761683BDAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN761683BDAR requirements.
6.How does Aetrix verify that SN761683BDAR is sourced from the original manufacturer or authorized distributors?
All SN761683BDAR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN761683BDAR meets industry standards.
7.What is the process for return or replacement of SN761683BDAR?
All SN761683BDAR units undergo pre-shipment inspection (PSI). If there is an issue with SN761683BDAR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN761683BDAR part is unused and in its original packaging.
Return procedure for SN761683BDAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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