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PDF LT6551 Data sheet ( Hoja de datos )
| Número de pieza | LT6551 | |
| Descripción | (LT6550 / LT6551) 3.3V Triple and Quad Video Amplifiers | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LT6551 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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FEATURES
s Single Supply Operation from 3V to 12.6V
s Small (3mm × 5mm) MSOP 10-Lead Package
s Internal Resistors for a Gain of Two
s 340V/µs Slew Rate
s 110MHz –3dB Bandwidth
s 30MHz Flat to 0.25dB
s 3% Settling Time: 20ns
s Input Common Mode Range Includes Ground
s Rail-to-Rail Output
s High Output Drive: 60mA
s Operating Temperature Range: – 40°C to 85°C
s 24-Bit RGB
U
APPLICATIO S
s Automotive Displays
s LCD and CRT Compatible
s RGB Amplifiers
s Coaxial Cable Drivers
s Low Voltage High Speed Signal Processing
s Set Top Boxes
, LTC and LT are registered trademarks of Linear Technology Corporation.
LT6550/LT6551
3.3V Triple and Quad
Video Amplifiers
DESCRIPTIO
The LT®6550/LT6551 are 3.3V triple and quad high speed
video amplifiers. These voltage feedback amplifiers drive
double terminated 50Ω or 75Ω cables and are configured
for a fixed gain of 2, eliminating six or eight external gain
setting resistors. The LT6550/LT6551 feature 110MHz
–3dB bandwidth, high slew rates and fast settling, making
them ideal for RGB video processing.
The LT6551 quad is designed for single supply operation
and the LT6550 triple can be used on either single or split
supplies. On a single 3.3V supply, the input voltage range
extends from ground to 1.55V and the output swings to
within 400mV of the supply voltage while driving a 150Ω
load. These features, combined with the ability to accept
RGB video signals without the need for AC coupling or
level shifting of the incoming signals, make the LT6550/
LT6551 an ideal choice for low voltage video applications.
Both the LT6550 and LT6551 are available in the small
10-Pin MSOP package and utilize a flow-thru pin out. The
small footprint results in a compact high performance
video amplifier solution.
TYPICAL APPLICATIO
3.3V Single Supply LT6551 RGB Plus SYNC Cable Driver
RIN
75Ω
GIN
75Ω
BIN
75Ω
SYNCIN
75Ω
GND
LT6551
450Ω
450Ω
–
OA
+
450Ω 450Ω
–
OA
+
450Ω 450Ω
–
OA
+
450Ω 450Ω
–
OA
+
3.3V
ROUT 75Ω
75Ω
GOUT 75Ω
75Ω
BOUT 75Ω
75Ω
75Ω
SYNCOUT
75Ω
6551 TA01a
DataSheet4 U .com
Output Step Response
VOUT
VIN
0V
VS = 3.3V
VIN = 0.5V TO 1.25V
f = 10MHz
0V
6550/51 TA01b
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LT6550/LT6551
±5V ELECTRICAL CHARACTERISTICS (LT6550 Only) The q denotes the specifications which apply over
the specified temperature range, otherwise specifications are at TA = 25°C. VS = ±5V, VIN = 0V (Pins 1,2,3) VGND = 0V (Pin 4) unless
otherwise noted.
PARAMETER
Gain Flatness
Gain Matching
Settling Time to 3%
Settling Time to 1%
% Overshoot
Differential Gain
Differential Phase
Channel Separation
CONDITIONS
Less than 0.25dB
Any One Channel to Any Other Channel
RL = 150Ω, VOUT = 1V to 2.5V
RL = 150Ω, VOUT = 1V to 2.5V
VOUT = 1V to 2.5V, RL = 150Ω
RL = 150Ω, Black Level = 0V at Device Output
RL = 150Ω, Black Level = 0V at Device Output
Measured at 10MHz
MIN TYP MAX UNITS
30 MHz
0.15 dB
20 ns
30 ns
5%
0.15 %
0.09 Deg
60 dB
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: A heat sink may be required to keep the junction temperature
below absolute maximum. This depends on the power supply voltage and
how many amplifiers are shorted.
Note 3: The LT6550C/LT6551C are guaranteed to meet specified
performance from 0°C to 70°C and are designed, characterized and
expected to meet specified performance from –40°C to 85°C but are not
tested or QA sampled at these temperatures. The LT6550I/LT6551I are
guaranteed to meet specified performance from – 40°C to 85°C.
Note 4: Thermal resistance varies depending upon the amount of PC board
metal attached to Pin 5 of the device. θJA is specified for a 2500mm2 test
board covered with 2oz copper on both sides.
Note 5: Gain is measured by changing the input voltage, and dividing the
change in output voltage by the change in input voltage.
Note 6: Minimum supply voltage is guaranteed by the PSRR test.
Note 7: The supply current specification includes additional output current
through the internal feedback and gain resistor.
Note 8: Guaranteed by correlation to slew rate at 5V and ±5V.
Note 9: The inputs are protected from ESD with diodes to the supplies.
Note 10: Noise is input referred, including internal gain resistors.
5V/3.3V TYPICAL PERFOR A CE CHARACTERISTICS
VEE (Pin 5) = 0V (LT6550), GND (Pin 5) = 0V (LT6551)
Supply Current Per Amplifier vs
Supply Voltage
14 VIN = 0.75V
12
RL = ∞
GND = 0V
TA = 25°C
TA = 125°C
10
8 TA = –55°C
6
4
2
0
0 1 2 3 4 5 6 7 8 9 10
VCC (V)
6550/51 G01
Output Voltage vs Input Voltage
3.5 VS = 3.3V, 0V
RL = 150Ω
3.0
TA = 125°C
TA = 25°C
TA = –55°C
2.5
2.0
1.5
1.0
0.5
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
VIN (V)
6550/51 G02
Input Bias Current vs
Temperature
–10
VS = 5V, 0V
–11 VOUT = 2.5V
–12
–13
–14
–15
–16
–17
–18
–19
–20
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
6550/51 G03
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LT6550/LT6551
APPLICATIO S I FOR ATIO
Amplifier Characteristics
Figure 1 shows a simplified schematic of one channel of
the LT6551 quad. Resistors RF and RG provide an internal
gain of 2. (The LT6550 triple is a slight variation with the
gain setting resistor, RG, connected to a separate ground
pin). The input stage consists of transistors Q1 to Q8 and
resistor R1. This topology allows for high slew rates at low
supply voltages. There are back-to-back series diodes, D1
to D4, across the + and – inputs of each amplifier to limit
the differential input voltage to ±1.4V. RIN limits the
current through these diodes if the input differential volt-
age exceeds ±1.4V. The input stage drives the degenera-
tion resistors of PNP and NPN current mirrors, Q9 to Q12,
that convert the differential signals into a single-ended
output. The complementary drive generator supplies cur-
rent to the output transistors that swing from rail-to-rail.
Input Voltage Range
The input voltage range is VEE to (VCC – 1.75V) over
temperature. If the device is operated on a single 3V supply
the maximum input is (3V – 1.75V) or 1.25V, and the
internal gain of two will set the output voltage to 2.5V.
Increasing the input beyond 1.25V will force the device out
of its linear range, no longer a gain of 2, and the output will
not increase beyond 2.5V. At a higher supply voltage, i.e.
5V, the maximum input voltage is 5V – 1.75V or 3.25V.
However, due to the internal gain of 2, the output will clip
with a lower input voltage. For linear unclipped operation
the minimum input voltage is (VOUT Min)/2 and the maxi-
mum input voltage is (VOUT Max)/2 or (VCC – 1.75V),
whichever is less.
ESD
The LT6550/LT6551 have reverse-biased ESD protection
diodes on all inputs and outputs as shown in Figure 1. If
these pins are forced beyond either supply, unlimited
current will flow through these diodes. If the current is
limited to 10mA or less, no damage to the device will
occur.
RF
450Ω
I1
V+
DESD1
IN
DESD2
RIN
225Ω
D1
GND D2
Q2
+ Q1
D3
D4
Q3 Q5
R1
Q4 Q6
I2
Q7
Q8 –
I3 R2 R3
V+
Q13
Q9 Q10
CM
COMPLEMENTARY
DRIVE
GENERATOR
Q11 Q12
V+
DESD3
OUT
DESD4
GND
RG
450Ω
I4 R4 R5
Q14
GND
6551 F01
DataSheet4 U .com
Figure 1. LT6551 Simplified Schematic
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11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LT6551.PDF ] | |
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