Wideband, High-Output-Current – Single Ended-to-Differential Line Drivers with Enable

  • Rajkumar Sharma
  • 16 Views
  • moderate
  • Tested
  • SKU: EL127301
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This is a Line Driver project. This single-ended-to-differential line driver is designed for high-speed communications. Using current feedback for greater bandwidth, this project delivers full-power bandwidth up to 405MHz and features slew rates as high as 6500V/µs. The MAX4447 has a fixed gain of +2V/V and a small-signal bandwidth of 430MHz. A low-power enable mode reduces current consumption below 5.5mA and places the outputs in a high-impedance state, Jumper J1 is provided to selectively enable and disable. The circuit can deliver differential output swings of ±6.2V from ±5V supplies with a 50Ω load. Excellent differential gain/phase and noise specifications make these project ideal for a wide variety of video and RF signal-processing and transmission applications. It is advisable to use gold-plated PCB and high-quality connectors for high-frequency operation.

Twisted-Pair Line Driver

The project is compatible and can be paired with our Ultra-High-Speed, Low-Distortion – Differential-to-Single-Ended Line Receivers with Enable that has been published in past.

The project is well-suited to drive twisted-pair cables. It is advisable to use a high-quality twisted pair cable like CAT5. The 24AWG telephone wire widely used, produces losses at higher frequencies.

Connections and Other details

  • CN1: Power Supply Input >> Pin1 =+5V DC, Pin2=+5V DC, Pin3=GND, Pin4=GND, Pin5= -5V DC, Pin6= -5V DC
  • CN3: Signal Ended Signal Input >> Pin1= Signal Input, Pin2=GND
  • CN2: Differential Output >> Pin1= +Output, Pin2=GND, Pin3=-Output
  • D1: Power LED
  • J1: Jumper >> GND Disable, VCC=Enable

Key Features

  • Operating Power Supply +/-5V DC (Dual 5V DC)
  • 6500V/µs Slew Rate
  • Small-Signal Bandwidth
  • Full-Power Bandwidth 430MHz
  • 200MHz 0.1dB Gain Flatness
  • 130mA Output Drive Current
  • +2V/V Internally Fixed Gain
  • -78dB SFDR at 100kHz
  • Low Differential Gain/Phase: 0.01%/0.02°
  • Ultra-Low Noise: 23nV per root-Hz at fIN = 1MHz
  • 8ns Settling Time to 0.1%
  • PCB Dimensions 35.72 x 29.37 mm
  • 4 x 3MM Mounting Holes

Applications

  • Coaxial to Twisted-Pair Converter
  • Differential ADC Driver
  • Differential Line Driver
  • Differential Pulse Amplifier
  • High-Speed Differential Transmitter
  • Single-Ended-to-Differential Conversion
  • Video and RF Signal Processing and Transmission
  • xDSL Applications

Schematic

Parts List

NO.QNTY.REF.DESC.MANUFACTURERSUPPLIERPART NO
11CN16 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5319-ND
21CN23 PIN SCREW TERMINAL PITCH 5.08MMPHOENIXDIGIKEY277-1248-ND
31CN32 PIN SCREW TERMINAL PITCH 5.08MMPHOENIXDIGIKEY277-1247-ND
42C1,C310uF/16V SMD SIZE 1210 CERAMIC OR TANTALUMYAGEO/MURATADIGIKEY
52C2,C40.1uF/50V SMD SIZE 0805YAGEO/MURATADIGIKEY
61D1LED RED SMD SIZE 0805LITE ON INCDIGIKEY160-1427-1-ND
71J13 PIN MALE HEADER PITCH 2.54MMWURTHDIGIKEY732-5316-ND
81R11K 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
93R2,R4,R549.9E 1% SMD SIZE 0805YAGEO/MURATADIGIKEY
101R3DNP
111R6470E 5% SMD SIZE 0805YAGEO/MURATADIGIKEY
121U1MAX4447 SOIC14ANALOG DEVICEDIGIKEYMAX4447ESE+TCT-ND
131J1-SSHUNT SULLINS CONCTDIGIKEYS9001-ND

Connections

 



Gerber View

Photos

Video

MAX4447 Datasheet

MAX4447-MAX4449

PCB

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