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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1016 

5V TRIPLE HIGH SPEED VIDEO AMPLIFIER 

 

 

1

 

LT6557 / LT6558 

DESCRIPTION  

Demonstration Circuit 1016 (DC1016) is a 5V Triple High 
Speed Video Amplifier featuring the LT6557 or LT6558 in 
DFN  packaging.  The  DC1016A–A  version  demonstrates 
the  gain-of-two  LT6557,  while  the  DC1016A–B  features 
the unity-gain LT6558. The board is designed to demon-
strate  AC-coupled  performance  in  5V  single-supply  op-

eration.  The  LT6557  and  LT6558  include  automatic  in-
ternal  biasing  that  is  programmable  with  one  resistor. 
Table  1  indicates  the  performance  that  is  achieved  with 
this evaluation board.  

Design  files  for  this  circuit  board  are  available.  Call 
the LTC factory. 

Table 1. 

 

Performance Summary (T

A

 = 25°C) 

PARAMETER 

CONDITION 

VALUE 

Supply Voltage 

Recommended Min/Max 

+5V/+10V 

Supply Current 

V

= 5V 

65mA 

Input Impedance, INR, ING, INB 

 

75

 to ground, ac-coupled internal 

signals 

Output Impedance, OUTR, OUTG, OUTB 

 

75

, ac-coupled 

CAL trace Impedance 

 

75

 nominal 

Outputs terminated into 75

 

 0dB nominal 

Gain (–A version) 

Outputs terminated into High impedance 

+6dB nominal 

Outputs terminated into 75

 

–6dB nominal 

Gain (–B version) 

Outputs terminated into High impedance 

 0dB nominal 

V

IN 

= 125mV

PP

 (-16dBm), –3dB, R

L

=75

 

7Hz to 380MHz typical 

Frequency Response 

V

IN 

= 125mV

PP

 (-16dBm), ±0.1dB, R

L

=75

 

7Hz to 130MHz typical 

Worst-case All Hostile, 10MHz 

–75dB typical 

Crosstalk 

Worst-case All Hostile, 100MHz 

–55dB typical 

Input Signal Voltage Range 

+5.0V Supply, No Output Clipping 

±0.6V about average dc (–A) 

±1.2V about average dc (–B) 

Logic Low Voltage (Amplifiers ON) 

≤ (

V

+

– 2)V 

On/Off Control Input 

Logic High Voltage (Amplifiers OFF) 

≥ (

V

+

– 0.5)V or open circuit

 

OPERATING PRINCIPLES 

DC1016  provides  three  identical  channels  of  wideband 
signal  amplification  suitable  for  driving  HDTV  or  high-
resolution  RGB  video  display  cables.  The  LT6557  pro-
vides  a  gain  of  two  for  driving  terminated  video  cables 
and  the  LT6558  has  unity  gain  for  use  with  high-
impedance loads. Each amplifier section is provided with 

series “back-termination” at the outputs (included on the 
board),  which  results  in  unity  gain  transmission  of  a 
video  signal  to  a  destination  load  (75

  for  –A;  1k

  or 

more  for  –B).  Each  input  is  dc  terminated  to  analog 
ground  to  properly  load  the  input  signal  cable.  The  in-
puts  are  ac-coupled  after  termination  to  eliminate  input 

Содержание LT6557

Страница 1: ... into High impedance 6dB nominal Outputs terminated into 75Ω 6dB nominal Gain B version Outputs terminated into High impedance 0dB nominal VIN 125mVPP 16dBm 3dB RL 75Ω 7Hz to 380MHz typical Frequency Response VIN 125mVPP 16dBm 0 1dB RL 75Ω 7Hz to 130MHz typical Worst case All Hostile 10MHz 75dB typical Crosstalk Worst case All Hostile 100MHz 55dB typical Input Signal Voltage Range 5 0V Supply No O...

Страница 2: ...and connector effects to be eliminated from the transmission measurements Figure 4 shows the material list of the components used by DC1016 and Figure 5 shows the electrical intercon nection QUICK START PROCEDURE Demonstration Circuit 1016 is easy to set up to evaluate the performance of the LT6557 or LT6558 Refer to Figure 1 for proper measurement equipment setup and follow the procedure below NO...

Страница 3: ...RT GUIDE FOR DEMONSTRATION CIRCUIT 1016 5V TRIPLE HIGH SPEED VIDEO AMPLIFIER 3 COM Power Supply 5 0 0 Inputs Outputs 5V 7 5V Figure1 Recommended Demo Circuit Setup Figure2 Typical Transmission Frequency Response ...

Страница 4: ...CUIT 1016 5V TRIPLE HIGH SPEED VIDEO AMPLIFIER 4 0 1 2 3 4 5 0 2 4 6 8 10 12 14 16 18 20 TIME nS OUTPUT V VIN 1Vp p VS 5V RL 150Ω Ω Ω Ω TA 25 C Figure3 Typical Time Domain Transmission Response Figure4 DC1016 Bill of Material A version shown ...

Страница 5: ...QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1016 5V TRIPLE HIGH SPEED VIDEO AMPLIFIER 5 Figure5 DC1016 Electrical Schematic Diagram ...

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