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Home > Products > Integrated Circuits (ICs) > Interface > Specialized

Renesas TW3801-TC1-CRT

Name: TW3801-TC1-CRT
Brand: Renesas
SKU: TW3801-TC1-CRT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TW3801-TC1-CRT

Manufacturer:: Renesas

Category:: Specialized

Package:: 100-TQFP

Datasheet:: TW3801-TC1-CRT.pdf

Description:: IC INTERFACE SPECIALIZED 100TQFP

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Product details

Overview

TW3801-TC1-CRT from Intersil is a Security Link Over Coax (SLOC) transmitter IC that encodes analog CVBS video and 100BASE-T Ethernet data into a single coaxial signal for transmission up to 500m over RG59 cable. It integrates an AFE, digital modem, dual MII/RMII interfaces, I²C control, and a 25MHz crystal interface in a 100-pin TQFP package. It serves as the camera-side SLOC endpoint in hybrid IP/analog security systems.

For engineers reviewing the TW3801-TC1-CRT datasheet, TW3801-TC1-CRT pinout, TW3801-TC1-CRT application, or TW3801-TC1-CRT equivalent, key selection criteria include its 36Mbps downlink speed, dual-mode MII/RMII interface configuration, integrated PLL with 25MHz crystal support, CVBS input compliance (1Vpp), and coaxial output drive capability with adaptive equalization for extended analog reach.

Technical Context

The TW3801-TC1-CRT implements a proprietary SLOC protocol stack combining Ethernet MAC/PHY emulation modes (Mode A: MAC-emulating, Mode B: PHY-emulating) with analog CVBS digitization and coaxial modulation. Its dual MII/RMII interfaces allow flexible integration with camera ISPs or external Ethernet PHYs, while register-controlled configuration (e.g., MODE_S3, register 0x01[3:2]) determines data path routing and link layer behavior.

It features a dedicated analog front-end with CVBS_IN input, LOAD_DRV reference load driver, COAX_OUT current-source output, and internal DAC/ADC subsystems referenced to VREF (1.2V) and COM_REF. The device supports full-duplex 100BASE-T operation with 4Mbps uplink and 36Mbps downlink, and includes Reed-Solomon error monitoring (registers 0x40–0x43) for link integrity diagnostics.

Key Specifications

Parameter	Value and Actual Design Meaning
Downlink Speed	36Mbps - maximum data rate from TW3801-TC1-CRT to TW3811 receiver; ensures compatibility with full-resolution IP video streams over coax.
Uplink Speed	4Mbps - fixed SLOC-compliant return channel bandwidth for control/status feedback and low-bandwidth upstream data.
CVBS Input Range	1Vpp - standard amplitude for NTSC/PAL composite video signals; enables direct connection to camera sensor outputs without level-shifting.
Coaxial Output Drive	0.5Vpp into 37.5Ω - differential-equivalent output level optimized for 75Ω coax termination with 150nH inductor; meets SLOC spectral mask requirements.
Digital Supply	VDD_D = 1.8V ±0.2V - core logic voltage; IDD_D = 160mA typical power draw defines thermal design margin for 100-TQFP package.
Analog Supply	VDD_A = VDD_ADC = VDD_DRV = 3.3V ±0.3V - shared 3.3V rail for analog signal chain; total analog supply current = 135mA typical.
Clock Input	25MHz ±50ppm crystal - required for internal PLL generation of MII (25MHz) or RMII (50MHz) timing; XTAL_IN/XTAL_OUT pins support Pierce oscillator configuration.

Pinout & Package

Package: 100-pin TQFP (12mm × 12mm, Pb-free, RoHS-compliant, Q100.12X12A drawing).

Pin/Terminal	Circuit Role	Design Meaning
CVBS_IN (77)	Analog Video Input	Accepts 1Vpp AC-coupled CVBS signal directly from camera sensor; internal PGA and ADC digitize luminance/chroma for SLOC encoding.
COAX_OUT (67)	Analog Coaxial Output	High-impedance current-source output; requires 75Ω series termination + 150nH inductor to VSS_A for proper SLOC signal shaping and impedance matching.
LOAD_DRV (66)	Driver Reference Load	Generates mirrored output current for COAX_OUT; must connect to 75Ω 1% resistor to ground; PCB layout isolation prevents coupling-induced instability.
MII/RMII Interface Pins (e.g., RX_D0A–RX_D3A, TX_D0A–TX_D3A, RX_CLKA, TX_CLKA, etc.)	Digital Ethernet Interface	Configurable as MII (25MHz) or RMII (50MHz); Mode A (MAC-emulation) or Mode B (PHY-emulation) selected via MODE_S3 and register 0x01[3:2].
I²C Interface (SDA, SCLK, A0, A1)	Configuration & Control Bus	2-wire serial interface for register read/write; A0/A1 set 2 LSBs of MDIO PHY address; SDA/SCLK support standard I²C timing (≤400kHz).
XTAL_IN / XTAL_OUT (84/85)	Clock Oscillator Interface	Connects to 25MHz fundamental-mode crystal with 22pF load capacitors and 1MΩ feedback resistor; enables PLL-based clock synthesis for all digital domains.

Key Features

Feature	Design Value
Simultaneous CVBS + IP over coax	Enables legacy analog monitor preview and modern IP video recording over same RG59 cable-eliminates dual-cable infrastructure in security camera deployments.
Proprietary adaptive analog equalizer	Compensates for high-frequency loss in long coax runs (up to 500m), preserving CVBS bandwidth (5.4MHz) and minimizing luminance non-linearity (≤5%) at full distance.
Dual MII/RMII interface modes	Supports both MAC-emulation (connect to external PHY) and PHY-emulation (connect to SoC/MAC), enabling drop-in integration across diverse camera ISP platforms.
Integrated SLOC-based IP DVR detection	Automatically identifies compatible TW3811 receivers on coax and establishes full-duplex link without host MCU intervention-reduces firmware complexity in embedded camera designs.
Reed-Solomon error monitoring	Hardware-accelerated FEC error counting (24-bit register set 0x40–0x43) provides real-time link quality metrics for diagnostics and adaptive bitrate adjustment.

Applications

IP + Analog Hybrid Security Camera	Coax-Based Video Distribution Hub
Use Scenario: Embedded in a network camera housing to transmit both live CVBS feed to local analog monitors and encoded IP video stream to NVR over single RG59 cable. IC Role / Device Role / Timing Role: TW3801-TC1-CRT acts as SLOC transmitter, digitizing CVBS, encapsulating Ethernet frames, and modulating combined signal onto coax; operates with 25MHz crystal-derived timing. Use Value: Reduces cabling cost and installation time by 50% versus separate coax + Ethernet runs; maintains analog compatibility during IP migration.	Use Scenario: Stand-alone converter module placed between IP camera and existing analog CCTV infrastructure to extend reach beyond 100m Ethernet limit. IC Role / Device Role / Timing Role: TW3801-TC1-CRT functions as IP+CVBS-to-SLOC bridge, accepting MII/RMII Ethernet and CVBS inputs, generating SLOC waveform, and driving coax output with adaptive equalization. Use Value: Enables reuse of legacy coax plant for HD IP video; achieves 500m transmission with <5% luminance distortion and 52.5dB SNR.
Smart DVR Front-End Interface	Multi-Channel SLOC Transmitter Board
Use Scenario: Integrated into DVR chassis to accept CVBS from analog cameras and Ethernet from IP cameras, converting both to unified SLOC format for centralized coax distribution. IC Role / Device Role / Timing Role: TW3801-TC1-CRT serves as SLOC encoder per channel, synchronizing CVBS sampling and Ethernet frame alignment using internal PLL locked to 25MHz crystal. Use Value: Unifies mixed analog/IP camera feeds onto single coax backbone; simplifies backplane routing and reduces board space vs. discrete PHY + AFE solutions.	Use Scenario: Used in multi-camera aggregation board where four TW3801-TC1-CRT devices encode video from four IP+CVBS sources onto individual coax lines. IC Role / Device Role / Timing Role: Each TW3801-TC1-CRT operates independently with dedicated 25MHz crystal or shared clock tree; configured via I²C to unique addresses (A0/A1) and MODE_Sx pins. Use Value: Enables scalable, modular expansion of SLOC infrastructure; supports synchronized timestamping across channels via common crystal reference.

IP + Analog Hybrid Security Camera

Coax-Based Video Distribution Hub

Use Scenario: Embedded in a network camera housing to transmit both live CVBS feed to local analog monitors and encoded IP video stream to NVR over single RG59 cable.

IC Role / Device Role / Timing Role: TW3801-TC1-CRT acts as SLOC transmitter, digitizing CVBS, encapsulating Ethernet frames, and modulating combined signal onto coax; operates with 25MHz crystal-derived timing.

Use Value: Reduces cabling cost and installation time by 50% versus separate coax + Ethernet runs; maintains analog compatibility during IP migration.

Use Scenario: Stand-alone converter module placed between IP camera and existing analog CCTV infrastructure to extend reach beyond 100m Ethernet limit.

IC Role / Device Role / Timing Role: TW3801-TC1-CRT functions as IP+CVBS-to-SLOC bridge, accepting MII/RMII Ethernet and CVBS inputs, generating SLOC waveform, and driving coax output with adaptive equalization.

Use Value: Enables reuse of legacy coax plant for HD IP video; achieves 500m transmission with <5% luminance distortion and 52.5dB SNR.

Smart DVR Front-End Interface

Multi-Channel SLOC Transmitter Board

Use Scenario: Integrated into DVR chassis to accept CVBS from analog cameras and Ethernet from IP cameras, converting both to unified SLOC format for centralized coax distribution.

IC Role / Device Role / Timing Role: TW3801-TC1-CRT serves as SLOC encoder per channel, synchronizing CVBS sampling and Ethernet frame alignment using internal PLL locked to 25MHz crystal.

Use Value: Unifies mixed analog/IP camera feeds onto single coax backbone; simplifies backplane routing and reduces board space vs. discrete PHY + AFE solutions.

Use Scenario: Used in multi-camera aggregation board where four TW3801-TC1-CRT devices encode video from four IP+CVBS sources onto individual coax lines.

IC Role / Device Role / Timing Role: Each TW3801-TC1-CRT operates independently with dedicated 25MHz crystal or shared clock tree; configured via I²C to unique addresses (A0/A1) and MODE_Sx pins.

Use Value: Enables scalable, modular expansion of SLOC infrastructure; supports synchronized timestamping across channels via common crystal reference.

Equivalent & Alternatives

The following parts are listed as comparable options for similar SLOC transmitter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
Intersil TW3801-TC1-CR	Same silicon die and electrical specs; differs only in tape-and-reel packaging (no 'T' suffix in part number indicates tray delivery).	No functional difference; identical use in camera modules or stand-alone converters.	Select TW3801-TC1-CR for tray-based assembly; TW3801-TC1-CRT is optimized for automated pick-and-place.
Intersil TW3801-TC1-CR-EVAL	Evaluation board (not IC); includes TW3801-TC1-CR, reference circuitry, RJ45, coax connectors, and test points.	Used for prototyping and validation only-not for production deployment.	Choose TW3801-TC1-CR-EVAL to verify SLOC link performance before committing to TW3801-TC1-CRT in volume design.

Compared with TW3801-TC1-CR and TW3801-TC1-CR-EVAL, the TW3801-TC1-CRT offers identical electrical functionality and timing behavior but is supplied in tape-and-reel format for high-volume SMT manufacturing, whereas the CR variant targets manual/tray assembly and the EVAL board enables rapid system-level testing without custom PCB development.

Availability

TW3801-TC1-CRT is available at Aetrix Electronics and suitable for IP+analog hybrid security cameras, coax-based video distribution hubs, smart DVR front-end interfaces, and multi-channel SLOC transmitter boards requiring stable component supply and long-term industrial temperature support.

Supply support for TW3801-TC1-CRT 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 Corporation (now part of Renesas Electronics) is a U.S.-based semiconductor company specializing in precision analog, power management, and interface ICs for industrial, communications, and consumer markets.

The TW3801 product line was designed specifically for Security Link Over Coax (SLOC) infrastructure, enabling simultaneous analog CVBS and digital IP video transport over legacy coax cabling in professional surveillance systems.

FAQ

What is the primary function of the TW3801-TC1-CRT in a security system?

The TW3801-TC1-CRT is a Security Link Over Coax (SLOC) transmitter IC that simultaneously encodes analog CVBS video and 100BASE-T Ethernet data into a single coaxial signal. In a security system, it enables hybrid operation-sending live analog video to local monitors while transmitting digital IP video to NVRs over the same RG59 cable, eliminating dual-cable infrastructure. Its role is strictly defined as the camera-side SLOC endpoint.

Does the TW3801-TC1-CRT support both MII and RMII Ethernet interfaces?

Yes, the TW3801-TC1-CRT supports both MII and RMII interfaces via configurable pin strapping (MODE_S3) and register settings (register 0x01[5]). In MII mode, TX_CLKA/RX_CLKA operate at 25MHz; in RMII mode, TX_CLKB/RX_CLKB run at 50MHz. The device has been validated with Marvell 88E1111, IC+ IP101A, SMSC LAN8710, and Realtek RTL8201EL PHYs in MII mode, and IP101A in RMII mode.

What is the maximum coaxial cable length supported by the TW3801-TC1-CRT?

The TW3801-TC1-CRT supports up to 500 meters of RG59 coaxial cable when transmitting both analog CVBS and digital IP video. This reach is achieved through its proprietary adaptive analog equalizer and robust SLOC modulation scheme. Electrical specifications confirm 5.4MHz video bandwidth and ≤5% luminance non-linearity at 500m, with 36Mbps downlink ensuring full HD IP throughput within this range.

How is the TW3801-TC1-CRT configured for different transmission speeds?

The TW3801-TC1-CRT transmission speed is configured either via hardware pins (MODE_S0/MODE_S1) or software registers (register 0x0A). When register 0x01[0] = 0, MODE_S0/MODE_S1 select 21–36Mbps; when register 0x01[0] = 1, register 0x0A bits [4:0] set the bitrate. For maximum compatibility, 36Mbps (0x13) is recommended-lower rates increase buffer overflow risk without meaningful distance gain.

What power supply voltages does the TW3801-TC1-CRT require?

The TW3801-TC1-CRT requires three distinct supply rails: 1.8V (VDD_D, 160mA typical) for digital core logic, 3.3V (VDD_IO, 7mA typical) for digital I/Os, and a shared 3.3V (VDD_A/VDD_ADC/VDD_DRV/VDD_DAC/VDD_PLL, 135mA typical) for all analog subsystems. Each supply must be bypassed with 0.1µF capacitors per pin, and ferrite beads are recommended on VDD_D and VDD_IO paths per datasheet layout guidance.

TW3801-TC1-CRT 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

TW3801-TC1-CRT FAQ

1.How can I place an order for TW3801-TC1-CRT through Aetrix?

Please submit a Request for Quotation (RFQ) for TW3801-TC1-CRT 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 TW3801-TC1-CRT reliable?

The price and inventory of TW3801-TC1-CRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TW3801-TC1-CRT is usually 5 days.

3.What payment methods are accepted for TW3801-TC1-CRT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TW3801-TC1-CRT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TW3801-TC1-CRT?

TW3801-TC1-CRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TW3801-TC1-CRT 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 TW3801-TC1-CRT?

For technical support, including TW3801-TC1-CRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TW3801-TC1-CRT requirements.

6.How does Aetrix verify that TW3801-TC1-CRT is sourced from the original manufacturer or authorized distributors?

All TW3801-TC1-CRT 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 TW3801-TC1-CRT meets industry standards.

7.What is the process for return or replacement of TW3801-TC1-CRT?

All TW3801-TC1-CRT units undergo pre-shipment inspection (PSI). If there is an issue with TW3801-TC1-CRT, 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 TW3801-TC1-CRT part is unused and in its original packaging.

Return procedure for TW3801-TC1-CRT:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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