LT6559CUD#TRPBF Linear Technology, LT6559CUD#TRPBF Datasheet - Page 11
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LT6559CUD#TRPBF
Manufacturer Part Number
LT6559CUD#TRPBF
Description
IC AMP VIDEO TRPL 16-QFN
Manufacturer
Linear Technology
Datasheet
1.LT6559CUDPBF.pdf
(16 pages)
Specifications of LT6559CUD#TRPBF
Applications
General Purpose
Number Of Circuits
3
-3db Bandwidth
300MHz
Slew Rate
800 V/µs
Current - Supply
4.6mA
Current - Output / Channel
100mA
Voltage - Supply, Single/dual (±)
4 V ~ 12 V, ±2 V ~ 6 V
Mounting Type
Surface Mount
Package / Case
16-WFQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
TYPICAL APPLICATIONS
Buffered RGB to YP
An LT6559 and an LT1395 can be used to map RGB signals
into YP
The LT1395 performs a weighted inverting addition of all
three inputs. The LT1395 output includes an amplifi cation
of the R input by:
The amplifi cation of the G input is by:
Finally, the B input is amplifi ed by:
Therefore, the LT1395 output is:
–0.3R – 0.59G – 0.11B = –Y.
1 07
−
2 94
−
−
549
.
.
324
324
324
B
k
k
P
R
= −
= −
= −
“component” video as shown in Figure 7.
SOURCES
R
G
B
0 59
0 30
0 11
75Ω
.
.
.
B
P
ALL RESISTORS 1%
V
Y = 0.30R + 0.59G + 0.11B
P
P
R
R11
80.6Ω
R12
86.6Ω
R13
76.8Ω
S
B
R
= ±3V TO ±5V
Conversion
= 0.57 (B – Y)
= 0.71 (R – Y)
549Ω
1.07k
2.94k
–
+
LT1395
324Ω
Figure 7. RGB to YP
150Ω
1/3 LT6559
1/3 LT6559
+
1/3 LT6559
–
–
+
–
+
This output is further scaled and inverted by –301/150
= –2 by LT6559 section A2, thus producing 2Y. With the
division by two that occurs due to the termination resistors,
the desired Y signal is generated at the load.
The LT6559 section A1 provides a gain of 2 for the R sig-
nal, and performs a subtraction of 2Y from the section A2
output. The output resistor divider provides a scaling factor
of 0.71 and forms the 75Ω back-termination resistance.
Thus, the signal seen at the terminated load is the desired
0.71(R – Y) = P
The LT6559 section A3 provides a gain of 2 for the B
signal, and also performs a subtraction of 2Y from the
section A2 output. The output resistor divider provides a
scaling factor of 0.57 and forms the 75Ω back-termination
resistance. Thus the signal seen at the terminated load is
the desired 0.57(B – Y) = P
For this circuit to develop a normal sync on the Y signal,
a normal sync must be inserted on each of the R, G, and
B inputs. Alternatively, additional circuitry could be added
to inject sync directly at the Y output with controlled cur-
rent pulses.
B
P
A2
A3
A1
R
301Ω
Conversion
R
301Ω
301Ω
301Ω
301Ω
.
105Ω
133Ω
75Ω
B
261Ω
174Ω
.
6559 F07
P
Y
P
R
B
LT6559
11
6559f