Linear LT6557 Quick Start Manual

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1016
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-
Table 1. Performance Summary (T
PARAMETER
Supply Voltage
Supply Current
Input Impedance, INR, ING, INB
Output Impedance, OUTR, OUTG, OUTB
CAL trace Impedance
Gain (–A version)
Gain (–B version)
Frequency Response
Crosstalk
Input Signal Voltage Range
On/Off Control Input

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
= 25°C)
A
CONDITION
Recommended Min/Max
+
V = 5V
Outputs terminated into 75Ω
Outputs terminated into High impedance
Outputs terminated into 75Ω
Outputs terminated into High impedance
V = 125mV
IN PP
V = 125mV
IN PP
Worst-case All Hostile, 10MHz
Worst-case All Hostile, 100MHz
+5.0V Supply, No Output Clipping
Logic Low Voltage (Amplifiers ON)
Logic High Voltage (Amplifiers OFF)
5V TRIPLE HIGH SPEED VIDEO AMPLIFIER
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.
(-16dBm), –3dB, R =75Ω
L
(-16dBm), ±0.1dB, R =75Ω
L
series "back-termination" at the outputs (included on the
board), which results in unity gain transmission of a
video signal to a destination load (75Ω for –A; 1kΩ 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
LT6557 / LT6558
VALUE
+5V/+10V
65mA
75Ω to ground, ac-coupled internal
signals
75Ω, ac-coupled
75Ω nominal
0dB nominal
+6dB nominal
–6dB nominal
0dB nominal
7Hz to 380MHz typical
7Hz to 130MHz typical
–75dB typical
–55dB typical
±0.6V about average dc (–A)
±1.2V about average dc (–B)
≤ (V
+
– 2)V
≥ (V
+
– 0.5)V or open circuit
1