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

Rajkumar Sharma
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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.	MANUFACTURER	SUPPLIER	PART NO
1	1	CN1	6 PIN MALE HEADER PITCH 2.54MM	WURTH	DIGIKEY	732-5319-ND
2	1	CN2	3 PIN SCREW TERMINAL PITCH 5.08MM	PHOENIX	DIGIKEY	277-1248-ND
3	1	CN3	2 PIN SCREW TERMINAL PITCH 5.08MM	PHOENIX	DIGIKEY	277-1247-ND
4	2	C1,C3	10uF/16V SMD SIZE 1210 CERAMIC OR TANTALUM	YAGEO/MURATA	DIGIKEY
5	2	C2,C4	0.1uF/50V SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
6	1	D1	LED RED SMD SIZE 0805	LITE ON INC	DIGIKEY	160-1427-1-ND
7	1	J1	3 PIN MALE HEADER PITCH 2.54MM	WURTH	DIGIKEY	732-5316-ND
8	1	R1	1K 5% SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
9	3	R2,R4,R5	49.9E 1% SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
10	1	R3	DNP
11	1	R6	470E 5% SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
12	1	U1	MAX4447 SOIC14	ANALOG DEVICE	DIGIKEY	MAX4447ESE+TCT-ND
13	1	J1-S	SHUNT	SULLINS CONCT	DIGIKEY	S9001-ND