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Texas Instruments SN761677DAR
- Part No.:
- SN761677DAR
- Manufacturer:
- Texas Instruments
- Category:
- Video Processing
- Package:
- 38-TSSOP (0.240", 6.10mm Width)
- Datasheet:
-
SN761677DAR.pdf
- Description:
- IC VIDEO TUNER 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:81,335
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Product details
Overview
SN761677DAR from Texas Instruments is a single-chip TV/VCR tuner IC integrating PLL synthesizer, 3-band (VHF-L/VHF-H/UHF) local oscillator, mixer, 30-V DC/DC converter for tuning amplifier bias, four NPN emitter-follower band switch drivers, and four NPN open-collector ports. It operates from a 5-V supply, uses I²C bus control with 4-byte transmission, and delivers 26 dB typical conversion gain across 55–804 MHz RF input range.
For engineers reviewing the SN761677DAR datasheet, SN761677DAR pinout, SN761677DAR application, or SN761677DAR equivalent, this page provides verified technical context, validated pin functions, confirmed electrical specifications including 35-V VDC output and 15-bit programmable counter, and real-world use cases in analog broadcast tuner modules requiring integrated frequency synthesis and high-voltage tuning voltage generation.
Technical Context
The SN761677DAR implements a fully integrated PLL-based frequency synthesis architecture with a 15-bit programmable counter and selectable reference divider ratios (512/640/1024), enabling precise tuning step control for 4-MHz crystal oscillator inputs. Its VHF/UHF front-end includes dedicated oscillator sections (VLO/VHI/UHF OSC) with separate base and collector terminals per band, plus dual IF outputs supporting 43-MHz or 45.75-MHz IF filtering.
It integrates a low-noise 30-V DC/DC converter (VDC output) with current-boost capability for tuning amplifier bias, alongside two independent digital I/O groups: four emitter-follower BS1–BS4 outputs for band switching and four open-collector P5–P8 ports for system-level control. All logic and serial interface operate at 5 V, with I²C compliance up to 400 kHz and address selection via AS pin voltage thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 5 V nominal (4.5–5.5 V); powers mixer, oscillator, PLL, and I²C interface |
| VDC Output Voltage | 35 V typical at 50 µA load; supplies tuning voltage for varactor diodes in VHF/UHF amplifiers |
| RF Input Range | 55–804 MHz across three bands; supports VHF-L (55.25 MHz), VHF-H (361.25 MHz), UHF (801.25 MHz) |
| Conversion Gain | 26 dB typical (23–29 dB min–max); enables direct IF output into 50-Ω systems without external amplification |
| Noise Figure | 10–11 dB across bands; maintains signal integrity in weak-signal terrestrial broadcast reception |
| I²C Interface | Up to 400 kHz clock rate; supports 4-byte write format with programmable address and status readback |
| Band Switch Drivers | Four NPN emitter followers (BS1–BS4); each sources ≥10 mA to drive PIN diode switches in multi-band RF front-ends |
Pinout & Package
SN761677DAR is housed in a 38-pin TSSOP (DA package), optimized for compact analog TV/VCR tuner modules. Pin functions are validated per TI SLES066A datasheet Rev A (December 2002), with dedicated RF, IF, oscillator, power, and digital I/O terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VLO OSC B / VLO OSC C | VHF-L oscillator base/collector | Connects to VHF-L tank circuit; enables independent low-band local oscillator operation |
| VHI OSC B / VHI OSC C | VHF-H oscillator base/collector | Drives VHF-H resonant network; isolated from VHF-L section to prevent intermodulation |
| UHF OSC B1/B2 / C1/C2 | UHF oscillator base/collector pairs | Supports dual-UHF oscillator topologies for improved phase noise and spurious suppression |
| BS1–BS4 | NPN emitter-follower band switch outputs | Directly drives PIN diode switches; logic-controlled band selection (e.g., BS1=1/BS2=0/BS4=0 = VHF-L) |
| P5–P8 | NPN open-collector ports | Sink up to –15 mA; used for general-purpose system control (e.g., mute, AGC enable, test mode) |
| VDC | DC/DC converter monitor output | Provides regulated 30-V output; must be decoupled with capacitor only-no external loading |
| VTU | Tuning voltage amplifier output | Delivers filtered tuning voltage to varactor diodes; low-impedance source for stable VCO control |
| SCL / SDA / AS | I²C bus interface pins | Enable full configuration of PLL, band switching, and status monitoring via 2-wire serial protocol |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 30-V DC/DC converter | Eliminates need for external high-voltage charge pump; reduces BOM count and PCB area in tuner designs |
| 15-bit programmable counter + reference divider | Enables fine frequency resolution (e.g., 62.5 kHz steps with 4-MHz crystal) for precise channel alignment |
| Dual IF outputs (IF OUT1/IF OUT2) | Supports differential or redundant IF paths; improves noise immunity in cost-sensitive consumer receivers |
| Four NPN emitter-follower band drivers | Provides sufficient current (≥10 mA) to directly drive PIN diodes without external buffers in 3-band RF switches |
| I²C-compatible 4-byte command structure | Allows full device configuration-including PLL, band select, test modes, and ADC readback-in minimal firmware overhead |
Applications
| Analog TV Tuner Module | VCR Front-End Assembly |
|---|---|
|
Use Scenario: Integrated tuner module in CRT-based analog television sets receiving terrestrial VHF/UHF broadcast signals. IC Role / Device Role / Timing Role: Primary frequency synthesis and signal downconversion IC; generates local oscillator signals, mixes RF input to IF, and supplies tuning voltage to RF amplifier varactors. Use Value: Single-chip integration reduces component count by >30% versus discrete PLL + mixer + DC/DC solutions, lowering assembly cost and improving thermal stability. |
Use Scenario: Signal acquisition stage in analog video cassette recorders for recording broadcast TV content. IC Role / Device Role / Timing Role: RF front-end controller; selects antenna input band (VHF-L/H or UHF), tunes local oscillator, and conditions IF output for downstream demodulation. Use Value: Built-in band switch drivers eliminate external transistor arrays, simplifying layout and ensuring consistent switching timing across all three bands. |
| Cable TV Set-Top Box Tuner | Legacy Broadcast Receiver Upgrade |
|
Use Scenario: Downconverter in early-generation cable-ready STBs supporting analog QAM channel reception. IC Role / Device Role / Timing Role: Multi-standard RF tuner IC; handles both off-air and cable signal paths via programmable band selection and IF output routing. Use Value: 35-V VDC output supports higher-tuned amplifier gain in cable environments with elevated signal levels and noise floor requirements. |
Use Scenario: Replacement tuner IC in service centers upgrading aging analog TVs with degraded original tuners. IC Role / Device Role / Timing Role: Drop-in functional replacement for obsolete tuner ICs; retains identical pinout, voltage domains, and I²C command set. Use Value: Pin-compatible upgrade path preserves existing PCB layout and firmware-no hardware or software redesign required for field repair. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TV/VCR tuner IC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN761676DAR | Same DA package and pinout; lacks UHF OSC B2/C2 terminals and dual IF outputs-supports only VHF-L/H bands. | Restricted to VHF-only systems; cannot replace SN761677DAR in UHF-capable designs without RF front-end redesign. | Select only when UHF reception is not required and board layout allows removal of unused UHF oscillator components. |
| TDA9886HN/C1 | Philips tuner IF/PLL IC; requires external VHF/UHF mixers and separate DC/DC converter; no integrated band switch drivers. | Higher BOM count and larger footprint; suited for modular tuner architectures where flexibility outweighs integration benefits. | Choose when design requires vendor diversification or legacy compatibility with Philips-based tuner platforms. |
Compared with SN761676DAR and TDA9886HN/C1, the SN761677DAR uniquely combines full 3-band RF synthesis, on-chip 30-V tuning voltage generation, and integrated band switching in one 38-pin TSSOP-enabling lowest-component-count tuner implementations for analog broadcast systems.
Availability
SN761677DAR is available at Aetrix Electronics and suitable for analog TV tuner modules, VCR front-end assemblies, and legacy broadcast receiver upgrades requiring stable component supply and long-term obsolescence management.
Supply support for SN761677DAR 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 over 90 years of innovation in precision analog design.
The SN761677DAR belongs to TI's legacy TV tuner IC product line, engineered specifically for cost-sensitive, high-volume analog broadcast reception systems requiring integrated frequency synthesis, RF mixing, and high-voltage tuning control.
FAQ
What is the primary function of the SN761677DAR in analog TV systems?
The SN761677DAR serves as a complete single-chip tuner IC in analog TV systems, performing RF signal downconversion via integrated VHF-L/VHF-H/UHF local oscillators and mixer stages, generating precise tuning voltages via its on-chip 30-V DC/DC converter, and controlling band selection through four dedicated NPN emitter-follower outputs. It replaces multiple discrete components while maintaining full I²C configurability for channel scanning and lock detection.
Does the SN761677DAR support I²C communication, and what are its timing limits?
Yes, the SN761677DAR supports standard-mode and fast-mode I²C communication with SCL clock frequencies up to 400 kHz. Its timing parameters-including 0.6 µs start hold time, 0.1 µs data setup time, and 0.3 µs rise/fall times-are fully compliant with I²C specification v2.1. The device uses a 4-byte write format for PLL programming and supports status readback including power-on reset flag and PLL lock indication.
What is the role of the VDC pin on the SN761677DAR, and how should it be used?
The VDC pin on the SN761677DAR is the output of its internal 30-V DC/DC converter, designed to supply tuning voltage to varactor diodes in RF amplifier stages. Per TI SLES066A, VDC must be connected only to a decoupling capacitor (no resistive or active loads) and isolated from other circuits. It delivers 35 V typical at light load (50 µA) with 100-ms settling time after TUVCC exceeds 4.5 V, enabling stable VCO control in broadcast tuner applications.
Can the SN761677DAR be used in UHF-only applications, and how is band selection configured?
Yes, the SN761677DAR supports UHF-only operation via its dedicated UHF oscillator section (pins 6–9) and mixer inputs (UHF RF IN1/IN2, pins 37–38). Band selection is controlled through the I²C ports byte: setting BS1=0, BS2=0, and BS4=1 activates UHF mode. The device's UHF-specific performance-10-dB noise figure at 367.25 MHz and 27-dB conversion gain at 801.25 MHz-confirms its suitability for high-frequency broadcast reception without VHF circuitry.
What are the absolute maximum ratings for the SN761677DAR's VTU and VDC pins?
The VTU pin has an absolute maximum rating of –0.4 V to 35 V, reflecting its role as a tuning voltage output driving varactor diodes. The VDC pin is rated for –0.4 V to 35 V under normal operation but must not be loaded-TI specifies zero external current draw to maintain regulation. Exceeding these limits risks permanent damage; both pins require proper decoupling and isolation from digital noise sources per the reference measurement circuit in SLES066A.
SN761677DAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 38-TSSOP (0.240", 6.10mm Width)
- Packaging:
- Bulk
- 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:
- 38-TSSOP
SN761677DAR FAQ
1.How can I place an order for SN761677DAR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN761677DAR 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 SN761677DAR reliable?
The price and inventory of SN761677DAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN761677DAR is usually 5 days.
3.What payment methods are accepted for SN761677DAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN761677DAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN761677DAR?
SN761677DAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN761677DAR 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 SN761677DAR?
For technical support, including SN761677DAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN761677DAR requirements.
6.How does Aetrix verify that SN761677DAR is sourced from the original manufacturer or authorized distributors?
All SN761677DAR 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 SN761677DAR meets industry standards.
7.What is the process for return or replacement of SN761677DAR?
All SN761677DAR units undergo pre-shipment inspection (PSI). If there is an issue with SN761677DAR, 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 SN761677DAR part is unused and in its original packaging.
Return procedure for SN761677DAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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