参数资料
| 型号： | LT6559CUD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/16页 |
| 文件大小： | 0K |
| 描述： | IC AMP VIDEO TRPL 16-QFN |
| 标准包装： | 2,500 |
| 应用： | 通用 |
| 电路数： | 3 |
| -3db带宽： | 300MHz |
| 转换速率： | 800 V/µs |
| 电流 - 电源： | 4.6mA |
| 电流 - 输出 / 通道： | 100mA |
| 电压 - 电源，单路/双路(±)： | 4 V ~ 12 V，±2 V ~ 6 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN-EP（3x3） |
| 包装： | 带卷 (TR) |
LT6559
11
6559f
TYPICAL APPLICATIONS
Buffered RGB to YPBPR Conversion
An LT6559 and an LT1395 can be used to map RGB signals
into YPBPR “component” video as shown in Figure 7.
The LT1395 performs a weighted inverting addition of all
three inputs. The LT1395 output includes an amplication
of the R input by:
=
324
107
030
.
k
The amplication of the G input is by:
=
324
549
059
.
Finally, the B input is amplied by:
=
324
294
011
.
k
Therefore, the LT1395 output is:
– 0.3R – 0.59G – 0.11B = –Y.
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) = PR.
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) = PB.
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.
Figure 7. RGB to YPBPR Conversion
–
+
LT1395
–
+
A2
1/3 LT6559
–
+
A1
1/3 LT6559
324
150
301
75
2.94k
549
R11
80.6
R
G
B
R12
86.6
R13
76.8
ALL RESISTORS 1%
VS = ±3V TO ±5V
Y
1.07k
75
SOURCES
301
301
301
301
133
PB
174
105
PR
261
6559 F07
–
+
A3
1/3 LT6559
Y = 0.30R + 0.59G + 0.11B
PB = 0.57 (B – Y)
PR = 0.71 (R – Y)
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