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Renesas TW3811-TC1-CR
- Part No.:
- TW3811-TC1-CR
- Manufacturer:
- Renesas
- Category:
- Specialized
- Package:
- 100-TQFP
- Datasheet:
-
TW3811-TC1-CR.pdf
- Description:
- IC INTERFACE SPECIALIZED 100TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:238
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Product details
Overview
TW3811-TC1-CR from Intersil is a Security Link Over Coax (SLOC) receiver IC that decodes a single coaxial SLOC signal into separate analog CVBS video and 100BASE-T Ethernet digital video data. It integrates an AFE, digital modem, dual MII/RMII interfaces, and proprietary adaptive equalization for CVBS extension up to 500m over RG59 cable. Designed for DVR/NVR integration or stand-alone SLOC-to-IP+CVBS conversion in surveillance systems.
For engineers reviewing the TW3811-TC1-CR datasheet, TW3811-TC1-CR pinout, TW3811-TC1-CR application, or TW3811-TC1-CR equivalent, key selection considerations include its 36Mbps downlink speed, 4Mbps uplink compliance, dual-mode MII/RMII interface configuration (MODE_S3), I²C control, and 100-TQFP package with explicit power domain separation (1.8V core, 3.3V I/O/analog).
Technical Context
The TW3811-TC1-CR implements a full-duplex SLOC link using proprietary modulation to simultaneously transport IP video and analog CVBS over coax. Its internal architecture includes a band-pass filtered ADC path for CVBS recovery, a DSP-based digital modem for SLOC demodulation, and dual configurable Ethernet interfaces - Mode A (MAC emulation, MIIA) for connection to external PHYs, and Mode B (PHY emulation, MIIB) for direct SoC interfacing.
It supports both MII (25MHz clock) and RMII (50MHz clock) operation, with interface mode selected at power-on via MODE_S3 and further configured via register 0x01[3:2]. The device uses an integrated PLL locked to a 25MHz crystal (±50ppm tolerance) and provides MDIO management for PHY address synchronization (via registers 0x1E/0x1F and pins A0/A1).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | SLOC™ receiver: converts coaxial SLOC signal to separate CVBS analog video and 100BASE-T Ethernet data streams |
| Downlink Speed | 36Mbps - maximum data rate from TW3801 transmitter to TW3811-TC1-CR, enabling high-resolution IP video transport |
| Uplink Speed | 4Mbps - SLOC-compliant upstream rate for control and metadata, optimized for 500m RG59 reach |
| Video Output | CVBS_OUT: 1Vpp output range, 5.4MHz bandwidth, 52.5dB SNR, and <5% luminance non-linearity under SLOC load |
| Digital Interface | Dual MII/RMII: configurable as MAC (Mode A) or PHY (Mode B); supports 100BASE-T only, not 10BASE-T |
| Supply Voltages | VDD_D = 1.8V ±0.2V (core logic), VDD_IO = VDD_A = VDD_DAC = VDD_PLL = 3.3V ±0.3V (I/O & analog domains) |
| Package | 100-pin TQFP (12×12mm, Pb-free, Q100.12X12A), -40°C to +85°C operating temperature range |
Pinout & Package
Package: 100-pin TQFP (12×12mm, RoHS-compliant, thermal resistance θJA = 41°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COAX_IN (78) | Analog input | High-impedance SLOC signal input; requires 75Ω termination and DC blocking per reference schematic |
| COAX_OUT (67) | Analog output | Current-source CVBS/RF output; must be terminated with 75Ω + 150nH to VSS_A for AC coupling to coax |
| CVBS_OUT (68) | Analog output | Inverted CVBS baseband video output; requires EL8101 inverting amplifier (gain = –2) for proper level and drive |
| MDC (3) / MDIO (4) | Digital management interface | I²C-like serial bus for PHY status polling and MDIO register access; max 3.125MHz clock (T1.1 ≥ 320ns) |
| RX_CLKA (22) / TX_CLKA (25) | Digital timing reference | MII Mode A clock inputs: RX_CLKA (25MHz) and TX_CLKA (25MHz); RMII uses TX_CLKB (50MHz) when MODE_S3 = 1 |
| MODE_S3 (93) | Configuration control | Primary MII interface selector: low = Mode A (TW3811 as MAC, connects to external PHY); high = Mode B (TW3811 as PHY, connects to SoC) |
| XTAL_IN (84) / XTAL_OUT (85) | Crystal oscillator interface | 25MHz fundamental-mode crystal connection with 22pF load caps and 1MΩ feedback resistor; enables internal PLL |
Key Features
| Feature | Design Value |
|---|---|
| Proprietary adaptive analog equalizer | Extends usable CVBS transmission distance to 500m over RG59 coax without external EQ components |
| SLOC-based IP camera detection | Automatically identifies and establishes link with compliant TW3801 transmitters; no manual pairing required |
| Dual configurable Ethernet interface | Supports both MII and RMII modes; selectable at boot via MODE_S3, with register override (0x01[3:2]) |
| Integrated PLL with crystal interface | Eliminates need for external clock generator; accepts 25MHz ±50ppm crystal directly on XTAL_IN/XTAL_OUT |
| Multi-domain power supply architecture | Separate 1.8V (VDD_D), 3.3V (VDD_IO/VDD_A/VDD_DAC/VDD_PLL) rails enable noise isolation between digital core and analog/IO paths |
Applications
| Security DVR Embedded Receiver | Stand-Alone SLOC-to-IP+CVBS Converter |
|---|---|
|
Use Scenario: Integrated into multi-channel DVR hardware to accept SLOC feeds from analog/IP hybrid cameras over existing coax infrastructure. IC Role / Device Role / Timing Role: SLOC receiver decoding coaxial signal into parallel CVBS and MII/RMII Ethernet streams for SoC ingestion and recording. Use Value: Enables legacy coax cabling reuse while delivering both real-time analog preview and high-bitrate IP video-no additional network switches or PoE injectors needed. |
Use Scenario: Mounted in enclosure with RJ45 and BNC connectors to convert SLOC camera output to standard Ethernet + CVBS monitor feed. IC Role / Device Role / Timing Role: Standalone protocol bridge; performs full SLOC demodulation, CVBS DAC reconstruction, and 100BASE-T MAC/PHY handshaking. Use Value: Eliminates need for camera-side encoder or DVR redesign; delivers plug-and-play compatibility with existing NVRs and analog monitors. |
| Multi-Channel SLOC Receiver Module | Hybrid Surveillance System Bridge |
|
Use Scenario: Used in 4-/8-channel SLOC receiver cards for centralized video management systems requiring simultaneous analog preview and IP streaming. IC Role / Device Role / Timing Role: One TW3811-TC1-CR per channel; each operates independently with dedicated COAX_IN, CVBS_OUT, and MII/RMII interface to host processor. Use Value: Provides deterministic latency (<1ms) and synchronized frame timing across channels-critical for forensic playback and motion analytics. |
Use Scenario: Interfacing legacy analog PTZ cameras with modern IP-based VMS platforms via coaxial backhaul. IC Role / Device Role / Timing Role: Receives SLOC-modulated video+control from TW3801-equipped PTZ encoders; outputs CVBS for local monitoring and Ethernet for VMS ingestion. Use Value: Preserves investment in analog PTZ hardware while enabling remote control, metadata embedding, and cloud upload via IP path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SLOC receiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Intersil TW3811-TC1-CR-EVAL | Evaluation board with TW3811-TC1-CR pre-mounted, reference schematics, and test points for coax, CVBS, and MII signals | Not a direct replacement; used for prototyping and validation only-requires separate power and host interface | Select for design-in verification, signal integrity testing, or firmware development before volume production of custom PCBs |
| Intersil TW3812-TC1-CR | Two-channel SLOC receiver in same 100-TQFP package; shares identical CVBS performance, SLOC protocol, and register map but doubles channel count | Enables dual-input DVR designs without board area increase; requires updated driver support for second channel's MII/RMII and interrupt routing | Select when system requires >1 SLOC input and board space is constrained-pin-compatible with shared power/ground layout but distinct register addressing |
Compared with TW3811-TC1-CR, the TW3811-TC1-CR-EVAL provides immediate hardware validation capability but no production scalability, while the TW3812-TC1-CR offers true channel density scaling within identical footprint and thermal envelope-both require matching TW3801-series transmitters for full SLOC interoperability.
Availability
TW3811-TC1-CR is available at Aetrix Electronics and suitable for security DVR embedded receivers, stand-alone SLOC-to-IP+CVBS converters, multi-channel receiver modules, and hybrid surveillance system bridges requiring stable component supply and long-term industrial lifecycle support.
Supply support for TW3811-TC1-CR 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
Intersil (now part of Renesas Electronics) is a semiconductor company specializing in precision analog, power management, and interface ICs for industrial, communications, and consumer applications.
The TW3811-TC1-CR belongs to Intersil's SLOC™ product line, designed specifically to enable cost-effective migration from analog CCTV to hybrid IP/analog surveillance systems using existing coaxial cabling infrastructure.
FAQ
What is the primary function of the TW3811-TC1-CR in a surveillance system?
The TW3811-TC1-CR serves as a Security Link Over Coax (SLOC) receiver that simultaneously recovers analog CVBS video and 100BASE-T Ethernet digital video from a single coaxial cable. In a surveillance system, it enables DVRs or NVRs to ingest both real-time analog preview and high-resolution IP streams from TW3801-equipped cameras-eliminating the need for separate video and network cabling. Its integrated AFE, digital modem, and dual MII/RMII interfaces make TW3811-TC1-CR central to hybrid analog/IP deployment.
How does the TW3811-TC1-CR handle power supply domains, and why is this important?
The TW3811-TC1-CR separates power domains into VDD_D (1.8V core digital), VDD_IO (3.3V digital I/O), and multiple 3.3V analog rails (VDD_A, VDD_DAC, VDD_PLL, etc.), each with dedicated ground pins (VSS_D, VSS_IO, VSS_A, etc.). This isolation prevents digital switching noise from corrupting sensitive analog CVBS output and SLOC demodulation paths. Proper ferrite-bead filtering and localized 0.1µF bypassing per supply pin-as specified in the TW3811-TC1-CR datasheet-are essential to maintain CVBS SNR >52dB and SLOC link stability over 500m.
Can the TW3811-TC1-CR operate in both MII and RMII modes, and how is the mode selected?
Yes, the TW3811-TC1-CR supports both MII (25MHz) and RMII (50MHz) operation. Mode selection occurs in two stages: first, MODE_S3 (pin 93) sets the primary interface role at power-on (low = Mode A/MAC emulation; high = Mode B/PHY emulation); second, register 0x01[5] (Interface Selection) determines MII vs. RMII timing-default is MII unless overridden. The 50MHz RMII clock may be sourced internally (TEST_IO pin) or externally (TX_CLKA), depending on register 0x01[6]. This flexibility allows TW3811-TC1-CR to interface with diverse SoCs and PHYs without hardware changes.
What is the maximum coaxial cable length supported by the TW3811-TC1-CR, and what conditions ensure compliance?
The TW3811-TC1-CR supports up to 500m of RG59 coaxial cable when paired with a TW3801 transmitter and configured for 4Mbps uplink (register 0x0A = 0x04). Compliance requires strict adherence to SLOC specifications: use of 75Ω impedance cable, proper COAX_IN termination, 25MHz ±50ppm crystal, and activation of the proprietary adaptive equalizer. Testing at 36Mbps downlink confirms full functionality at 500m; rates above 4Mbps uplink may fail SLOC compliance tests due to increased jitter and error floor-verified in TW3811-TC1-CR characterization data.
How does the TW3811-TC1-CR manage SLOC link establishment and health monitoring?
The TW3811-TC1-CR autonomously detects and locks to SLOC carriers using proprietary modulation recognition. Link status is reported via status register 0x44: bit 4 (SLOC Rx Locked) indicates carrier acquisition, bit 5 (SLOC Data Active) confirms valid data framing, and bit 3 (Ethernet PHY Connected) reflects MII link handshake success. Reed-Solomon error counters (registers 0x40–0x42) provide quantitative link quality metrics, updated when bit 0 of register 0x43 goes high. These real-time diagnostics enable TW3811-TC1-CR to support robust failover and maintenance alerts in mission-critical surveillance deployments.
TW3811-TC1-CR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 100-TQFP
- Packaging:
- Tray
- Product Status:
- Active
- Applications:
- Security Systems
- Interface:
- MII, RMII
- Voltage - Supply:
- 1.8V, 3.3V
- Supplier Device Package:
- 100-TQFP (12x12)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
TW3811-TC1-CR FAQ
1.How can I place an order for TW3811-TC1-CR through Aetrix?
Please submit a Request for Quotation (RFQ) for TW3811-TC1-CR 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 TW3811-TC1-CR reliable?
The price and inventory of TW3811-TC1-CR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TW3811-TC1-CR is usually 5 days.
3.What payment methods are accepted for TW3811-TC1-CR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TW3811-TC1-CR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TW3811-TC1-CR?
TW3811-TC1-CR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TW3811-TC1-CR 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 TW3811-TC1-CR?
For technical support, including TW3811-TC1-CR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TW3811-TC1-CR requirements.
6.How does Aetrix verify that TW3811-TC1-CR is sourced from the original manufacturer or authorized distributors?
All TW3811-TC1-CR 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 TW3811-TC1-CR meets industry standards.
7.What is the process for return or replacement of TW3811-TC1-CR?
All TW3811-TC1-CR units undergo pre-shipment inspection (PSI). If there is an issue with TW3811-TC1-CR, 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 TW3811-TC1-CR part is unused and in its original packaging.
Return procedure for TW3811-TC1-CR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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