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Twisted-Pair Cable-CAT5 – Composite Video Differential Receiver Amplifier
The circuit presented here is a high frequency differential line receiver amplifier which has excellent common-mode rejection at its inputs. The project is an ideal solution for a receiver for composite video signals that are transmitted over long distance on twisted-pair cables like CAT5. Category 5 cables are very common in office settings and are extensively used for data transmission. These cables can also be used for the analog transmission of signals such as video. These long cables pick up noise from the environment they pass through. This noise does not favour one conductor over another and therefore is a common-mode signal. A receiver that rejects the common-mode signal on the cable can greatly enhance the signal-to-noise ratio performance of the link.
This project converts differential Video/Digital signals into single-ended signals and can be paired with Single-ended Video/Digital input to differential output driver (High Speed Differential Driver) project published on our website.
Transmitter and receiver work in tandem to convert a Composite Video signal to differential signal and transmit it over a single CAT-5 cable pair to a projector, monitor, or television. Ideal for digital signs, schools, temples, and trade shows. Line driver and line receiver projects can be used to transmit and receive composite video signals over 300 meters of category 5 (CAT-5) cable. The cable has an attenuation of approximately 20dB at 10Mhz for 300 meters.
Features
- Operating Supply Dual +5V/-5V (+/-5V) @ 80mA
- Compact Solution for Video Transmitter and Receiver over CAT-5 Twisted Cable
- Screw Terminal for Twisted Pair CAT-5 Cable
- RCA Connector for Video Outputs
- Header Connector For +5V/-5V Supply input
- Onboard Power LED
- PCB Dimensions 37.31 x 24.45 mm
Schematic
Parts List
| NO | QNTY | REF | DESC | MANUFACTURER | SUPPLIER | SUPPLIER PART NO |
|---|---|---|---|---|---|---|
| 1 | 1 | CN1 | 3 PIN MALE HEADER PITCH 2.54MM | WURTH | DIGIKEY | 732-5316-ND |
| 2 | 1 | CN2 | 3 PIN SCREW TERMINAL PITYCH 5.08MM | PHOENIX | DIGIKEY | 277-1248-ND |
| 3 | 2 | C1,C3 | 0.1uF/50V SMD SIZE 0805 | MURATA/YAGEO | DIGIKEY | |
| 4 | 2 | C2,C4 | 10uF/10V SMD SIZE 1206 | MURATA/YAGEO | DIGIKEY | |
| 5 | 4 | R2,R5,C5,C6 | DNP | DIGIKEY | ||
| 6 | 1 | C7 | 200PF/50V SMD SIZE 0805 | MURATA/YAGEO | DIGIKEY | |
| 7 | 1 | D1 | LED RED SMD SIZE 0805 | OSRAM | DIGIKEY | 475-1278-1-ND |
| 8 | 1 | J1 | RCA JACK | CUI DEVICE | DIGIKEY | CP-1405-ND |
| 9 | 3 | R1,R6,R7 | 0E SMD SIZE 0805 | MURATA/YAGEO | DIGIKEY | |
| 10 | 2 | R3,R9 | 100E 5% SMD SIZE 0805 | MURATA/YAGEO | DIGIKEY | |
| 11 | 2 | R4,R8 | 1K 1% SMD SIZE 0805 | MURATA/YAGEO | DIGIKEY | |
| 12 | 1 | R10 | 499E 1% SMD SIZE 0805 | MURATA/YAGEO | DIGIKEY | |
| 13 | 1 | U1 | AD8130 | ANALOG | DIGIKEY | 2156-AD8130AR-AD-ND |
Connections
Pairing
Gerber View
Photos
Video
AD8130 Datasheet
PCB
