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PDF LT6559 Data sheet ( Hoja de datos )
| Número de pieza | LT6559 | |
| Descripción | Low Cost 5V/+-5V 300MHz Triple Video Amplifier | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
■ 300MHz Bandwidth on Single 5V and ±5V
(AV = 1, 2 and –1)
■ 0.1dB Gain Flatness: 150MHz (AV = 1, 2 and –1)
■ High Slew Rate: 800V/µs
■ Wide Supply Range:
±2V to ±6V (Dual Supply)
www.Data4ShVeetot41U.2cVom(Single Supply)
■ 80mA Output Current
■ Low Supply Current: 3.9mA/Amplifier
■ Shutdown Mode
■ Fast Turn-On Time: 30ns
■ Fast Turn-Off Time: 40ns
■ Small 0.75mm Tall 16-Lead 3mm × 3mm QFN Package
APPLICATIONS
■ RGB/YPBPR Cable Drivers
■ LCD Projectors
■ KVM Switches
■ A/V Receivers
■ MUX Amplifiers
■ Composite Video Cable Drivers
■ ADC Drivers
LT6559
Low Cost 5V/±5V 300MHz
Triple Video Amplifier
in 3mm × 3mm QFN
DESCRIPTION
The LT®6559 is a low cost, high speed, triple amplifier that
has been optimized for excellent video performance on a
single 5V supply, yet fits in the small footprint of a 3mm ×
3mm QFN package. With a –3dB bandwidth of 300MHz, a
0.1dB bandwidth of 150MHz, and a slew rate of 800V/µs,
the LT6559’s dynamic performance is an excellent match
for high speed RGB or YPBPR video applications.
For multiplexing applications such as KVM switches or
selectable video inputs, each channel has an independent
high speed enable/disable pin. Each amplifier will turn on
in 30ns and off in 40ns. When enabled, each amplifier
draws 3.9mA from a 5V supply. The LT6559 operates on
a single supply voltage ranging from 4V to 12V, and on
split supplies ranging from ±2V to ±6V.
The LT6559 comes in a compact 16-lead 3mm × 3mm QFN
package, and operates over a –40°C to 85°C temperature
range. The LT6559 is manufactured on Linear Technology’s
proprietary complementary bipolar process.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
VIN A
RG
182Ω
3-Input Video MUX Cable Driver
5V A
+ EN A
1/3 LT6559
–
RF
– 5V 301Ω
VIN B
RG
182Ω
CHANNEL SELECT
B
5V
+ EN B
1/3 LT6559
–
RF
– 5V 301Ω
VIN C
RG
182Ω
C
100Ω
100Ω
5V
+ EN C
1/3 LT6559
–
RF
– 5V 301Ω
75Ω
CABLE
VOUT
75Ω
100Ω
Square Wave Response
OUTPUT
200mV/DIV
RL = 100Ω
RF = RG = 301Ω
f = 10MHz
TIME (10ns/DIV)
6559 TA02
6559f
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
Closed-Loop Gain vs Frequency
(AV = 1)
4
2
0
–2
–4
www.DataSheet4U.com
1M 10M 100M
VS = ±5V FREQUENCY (Hz)
VIN = –10dBm
RF = 365Ω
RL = 150Ω
1G
6559 G01
Closed-Loop Gain vs Frequency
(AV = 2)
10
8
6
4
2
1M 10M 100M
VS = ±5V FREQUENCY (Hz)
VIN = –10dBm
RF = RG = 301Ω
RL = 150Ω
1G
6559 G02
Large-Signal Transient Response
(AV = 1)
Large-Signal Transient Response
(AV = 2)
LT6559
Closed-Loop Gain vs Frequency
(AV = –1)
4
2
0
–2
–4
1M 10M 100M
VS = ±5V FREQUENCY (Hz)
VIN = –10dBm
RF = RG = 301Ω
RL = 150Ω
1G
6559 G03
Large-Signal Transient Response
(AV = –1)
VS = ±5V
VIN = ±2.5V
RF = 365Ω
RL = 150Ω
TIME (5ns/DIV)
6559 G04
VS = ±5V
TIME (5ns/DIV)
VIN = ±1.25V
RF = RG = 301Ω
RL = 150Ω
6559 G05
VS = ±5V
TIME (5ns/DIV)
VIN = ±2.5V
RF = RG = 301Ω
RL = 150Ω
6559 G06
2nd and 3rd Harmonic Distortion
vs Frequency
30
TA = 25°C
40 RF = RG = 301Ω
RL = 150Ω
50 VS = ± 5V
VOUT = 2VPP
60
HD2
70
HD3
80
90
100
110
1
10 100 1000 10000 100000
FREQUENCY (kHz)
6559 G07
Maximum Undistorted Output
Voltage vs Frequency
8
7
AV = +1
AV = +2
6
5
4
TA = 25°C
3 RF = 301Ω
RL = 150Ω
VS = ± 5V
2
1
10
FREQUENCY (MHz)
100
6559 G08
PSRR vs Frequency
80
70
60
– PSRR + PSRR
50
40
30
20 TA = 25°C
RF = RG = 301Ω
10 RL = 150Ω
AV = +2
0
10k 100k
1M
10M
FREQUENCY (Hz)
100M
6559 G09
6559f
5
5 Page 
LT6559
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 amplification
of the R input by:
−324 = −0.30
1.07k
wwwT.DheatamShpeleifit4cUa.ctioomn of the G input is by:
−324 = −0.59
549
Finally, the B input is amplified by:
−324 = −0.11
2.94k
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.
75Ω
SOURCES
R
G
B
1.07k
R11
80.6Ω
549Ω
R12
86.6Ω
2.94k
R13
76.8Ω
324Ω
–
LT1395
+
Y = 0.30R + 0.59G + 0.11B
PB = 0.57 (B – Y)
PR = 0.71 (R – Y)
ALL RESISTORS 1%
VS = ±3V TO ±5V
+
A1
1/3 LT6559
–
150Ω
301Ω
–
A2
1+/3 LT6559
–
A3
1+/3 LT6559
105Ω
301Ω
261Ω
PR
301Ω
75Ω
301Ω
Y
301Ω
133Ω
174Ω
PB
6559 F07
Figure 7. RGB to YPBPR Conversion
6559f
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT6559.PDF ] | |
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