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LT6550/LT6551 3.3V Triple and Quad Video Amplifiers
FEATURES
s s s s s s s s s s s s
DESCRIPTIO
Single Supply Operation from 3V to 12.6V Small (3mm x 5mm) MSOP 10-Lead Package Internal Resistors for a Gain of Two 340V/s Slew Rate 110MHz -3dB Bandwidth 30MHz Flat to 0.25dB 3% Settling Time: 20ns Input Common Mode Range Includes Ground Rail-to-Rail Output High Output Drive: 60mA Operating Temperature Range: - 40C to 85C 24-Bit RGB
The LT(R)6550/LT6551 are 3.3V triple and quad high speed video amplifiers. These voltage feedback amplifiers drive double terminated 50 or 75 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 150 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.
APPLICATIO S
s s s s s s
Automotive Displays LCD and CRT Compatible RGB Amplifiers Coaxial Cable Drivers Low Voltage High Speed Signal Processing Set Top Boxes
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
LT6551 450 RIN 75 - OA + 450 GIN 75 - OA + 450 BIN 75 - OA + 450 SYNCIN 75 - OA + 450 450 450 450
3.3V Single Supply LT6551 RGB Plus SYNC Cable Driver Output Step Response
3.3V
ROUT 75 75
GOUT 75 75
BOUT 75 75
VIN 0V VS = 3.3V VIN = 0.5V TO 1.25V f = 10MHz
6550/51 TA01b
75 SYNCOUT 75
6551 TA01a
GND
U
VOUT 0V
65501f
U
U
1
LT6550/LT6551
ABSOLUTE
(Note 1)
AXI U RATI GS
Specified Temperature Range (Note 3) LT6550C/LT6551C ..............................-40C to 85C LT6550I/LT6551I ................................ - 40C to 85C Maximum Junction Temperature .......................... 150C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
Total Supply Voltage LT6550 (VCC TO VEE) ........................................ 12.6V LT6551 (VCC TO GND) ...................................... 12.6V Input Current (Note 9) ........................................ 10mA Output Short-Circuit Duration (Note 2) ............ Indefinite Operating Temperature Range ................ - 40C to 85C
PACKAGE/ORDER I FOR ATIO
TOP VIEW IN1 IN2 IN3 GND VEE 1 2 3 4 5
X2 X2 X2
ORDER PART NUMBER
10 9 8 7 6 VCC OUT1 OUT2 OUT3 N/C
LT6550CMS LT6550IMS MS10 PART MARKING LTB9 LTC1
MS10 PACKAGE 10-LEAD PLASTIC MSOP
TJMAX = 150C, JA = 110C/W (Note 4)
Consult LTC Marketing for parts specified with wider operating temperature ranges.
3.3V ELECTRICAL CHARACTERISTICS
PARAMETER DC Output Accuracy Output Voltage Matching Input Current Input Impedance, VIN/IIN Input Noise Voltage Density Input Noise Current Density Voltage Gain (Note 5) CONDITIONS
The q denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25C. VCC = 3.3V, VGND = 0V; VIN = 0.75V LT6550 (Pins 1,2,3); LT6551 (Pins 1,2,3,4). VEE = 0V LT6550 (Pin 5), unless otherwise noted.
MIN
q q q q
No Load, VOUT Ideal = 1.5V Between Any Two Outputs Any Input VIN = 0V to 1V f = 100kHz (Note 10) f = 100kHz (Note 10) 0.25V VIN 1.25V No Load RL = 150 RL = 75, 0.25V VIN 0.75V VIN = - 0.1V No Load ISINK = 5mA ISINK = 10mA VIN = 1.75V No Load RL = 150 RL = 75
Output Voltage Swing Low
Output Voltage Swing High
2
U
U
W
WW U
W
TOP VIEW IN1 IN2 IN3 IN4 GND 1 2 3 4 5
X2 X2 X2 X2
ORDER PART NUMBER
10 9 8 7 6 VCC OUT1 OUT2 OUT3 OUT4
LT6551CMS LT6551IMS MS10 PART MARKING LTC2 LTC3
MS10 PACKAGE 10-LEAD PLASTIC MSOP
TJMAX = 150C, JA = 110C/W (Note 4)
TYP 30 25 15
MAX 70 75 65
UNITS mV mV A k nV/Hz pA/Hz
100
300 12 8
q q
1.9 1.9 1.85 10 60 90 3.0 2.5 2.0 3.2 2.9 2.5
2.1 2.1 2.15 30 150 200
V/V V/V V/V mV mV mV V V V
65501f
q q q q q
LT6550/LT6551
3.3V ELECTRICAL CHARACTERISTICS
PARAMETER PSRR Minimum Supply Voltage (Note 6) Output Short-Circuit Current Supply Current per Amplifier (Note 7)
q
The q denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25C. VCC = 3.3V, VGND = 0V; VIN = 0.75V LT6550 (Pins 1,2,3); LT6551 (Pins 1,2,3,4). VEE = 0V LT6550 (Pin 5), unless otherwise noted.
CONDITIONS VCC = 3V to 10V, VIN = 0.5V VIN = 1V, VOUT = 0V
q q q
MIN 40 3 35 25
TYP 48 50 8.5
MAX
UNITS dB V mA mA
10 11
mA mA V/s V/s MHz MHz dB ns ns % % Deg dB
Slew Rate (Note 8) Small Signal -3dB Bandwidth Gain Flatness Gain Matching Settling Time to 3% Settling Time to 1% % Overshoot Differential Gain Differential Phase Channel Separation
RL = 150, VOUT = 0.5V to 2.5V Measured from 1V to 2V RL = 150 Less than 0.25dB Any One Channel to Any Other Channel RL = 150, VOUT = 1V to 2.5V RL = 150, VOUT = 1V to 2.5V VOUT = 1V to 2.5V, RL = 150 RL = 150, Black Level = 0.6V at Device Output RL = 150, Black Level = 0.6V at Device Output Measured at 10MHz
q
140 115
250 90 30 0.15 20 30 5 0.09 0.09 60
5V ELECTRICAL CHARACTERISTICS
PARAMETER Output Accuracy Output Voltage Matching Input Current Input Impedance, VIN /IIN Input Noise Voltage Density Input Noise Current Density Voltage Gain (Note 5) VIN = 0V to 2V CONDITIONS
The q denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25C. VCC = 5V, VGND = 0V; VIN = 1.25V LT6550 (Pins 1,2,3); LT6551 (Pins 1,2,3,4). VEE = 0V LT6550 (Pin 5), unless otherwise noted.
MIN
q q q q
TYP 30 40 15
MAX 70 90 65
UNITS mV mV A k nV/Hz pA/Hz
No Load, VOUT Ideal = 2.5V Between Any Two Outputs
100
300 12 8
f = 100kHz (Note 10) f = 100kHz (Note 10) 0.25V VIN 1.75V No Load RL = 150 RL = 75, 0.25V VIN 1.25V, 0C TA 70C (Only) VIN = - 0.1V No Load ISINK = 5mA ISINK = 10mA VIN = 2.6V No Load RL = 150 RL = 75, 0C TA 70C (Only) VCC = 3V to 10V, VIN = 0.5V
q q q q q q q q q q q
1.9 1.9 1.85 10 60 90 4.6 3.5 2.5 40 3 4.8 4.1 3.2 48
2.1 2.1 2.15 30 150 200
V/V V/V V/V mV mV mV V V V dB V
Output Voltage Swing Low
Output Voltage Swing High
PSRR Minimum Supply Voltage (Note 6)
65501f
3
LT6550/LT6551
The q denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25C. VCC = 5V, VGND = 0V; VIN = 1.25V LT6550 (Pins 1,2,3); LT6551 (Pins 1,2,3,4). VEE = 0V LT6550 (Pin 5), unless otherwise noted.
PARAMETER Output Short-Circuit Current CONDITIONS VIN = 1V, VOUT = 0V 0C TA 70C - 40C TA 85C
q q q
5V ELECTRICAL CHARACTERISTICS
MIN 45 40 30
TYP 60
MAX
UNITS mA mA mA
Supply Current per Amplifier (Note 7) Slew Rate Small Signal -3dB Bandwidth Gain Flatness Gain Matching Settling Time to 3% Settling Time to 1% % Overshoot Differential Gain Differential Phase Channel Separation RL = 150, VOUT = 0.5V to 3.5V, Measured from 1V to 3V RL = 150 Less than 0.25dB Any One Channel to Any Other Channel RL = 150, VOUT = 1V to 2.5V RL = 150, VOUT = 1V to 2.5V VOUT = 1V to 2.5V, RL = 150 RL = 150, Black Level = 1V at Device Output RL = 150, Black Level = 1V at Device Output Measured at 10MHz 220 180
9.5 340 110 30 0.15 20 35 5 0.05 0.05 60
11.5 12.5
mA mA V/s V/s MHz MHz dB ns ns % % Deg dB
q
5V ELECTRICAL CHARACTERISTICS
PARAMETER Output Offset Output Voltage Matching Input Current Input Impedance, VIN /IIN Input Noise Voltage Density Input Noise Current Density Voltage Gain VIN = -1V to 1V CONDITIONS
(LT6550 Only) The q denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25C. VS = 5V, VIN = 0V (Pins 1,2,3) VGND = 0V (Pin 4) unless otherwise noted.
MIN
q q q q
TYP 30 20 20
MAX 70 60 70
UNITS mV mV A k nV/Hz pA/Hz
Between Any Two Outputs
200
500 12 8
f = 100kHz (Note 10) f = 100kHz (Note 10) - 1.75V VIN 1.75V No Load RL = 150 RL = 75, - 1V VIN 1V VIN = 2.6V No Load RL = 150 RL = 75, 0C TA 70C (Only) VS = 2.5V to 5V, VO = 0V 0C TA 70C -40C TA 85C
q q q q q q q q q q
1.9 1.9 1.9 4.6 3.5 2.6 38 45 40 30 4.8 4.2 3.2 48 60
2.1 2.1 2.1
V/V V/V V/V V V V dB mA mA mA
Output Voltage Swing
PSRR Output Short-Circuit Current
Supply Current per Amplifier Slew Rate Small Signal -3dB Bandwidth RL = 150, VOUT = -3V to 3V, Measured from -2V to 2V RL = 150 400 300
8.5 600 90
10.5 12
mA mA V/s V/s MHz
65501f
q
4
LT6550/LT6551
5V ELECTRICAL CHARACTERISTICS
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
(LT6550 Only) The q denotes the specifications which apply over the specified temperature range, otherwise specifications are at TA = 25C. VS = 5V, VIN = 0V (Pins 1,2,3) VGND = 0V (Pin 4) unless otherwise noted.
MIN TYP 30 0.15 20 30 5 0.15 0.09 60 MAX UNITS MHz dB ns ns % % Deg dB
Any One Channel to Any Other Channel RL = 150, VOUT = 1V to 2.5V RL = 150, VOUT = 1V to 2.5V VOUT = 1V to 2.5V, RL = 150 RL = 150, Black Level = 0V at Device Output RL = 150, Black Level = 0V at Device Output Measured at 10MHz
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 0C to 70C and are designed, characterized and expected to meet specified performance from -40C to 85C but are not tested or QA sampled at these temperatures. The LT6550I/LT6551I are guaranteed to meet specified performance from - 40C to 85C.
Note 4: Thermal resistance varies depending upon the amount of PC board metal attached to Pin 5 of the device. JA 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 12 VIN = 0.75V RL = GND = 0V 3.5 TA = 125C TA = 25C 3.0 2.5
SUPPLY CURRENT (mA)
10 8 6 4 2 0 0 1 2 3 4 56 VCC (V) 7 8 9 10
INPUT BIAS (A)
VOUT (V)
TA = -55C
6550/51 G01
UW
2.0 1.5 1.0 0.5 0
Output Voltage vs Input Voltage
VS = 3.3V, 0V RL = 150 TA = 125C TA = 25C TA = -55C -10
Input Bias Current vs Temperature
VS = 5V, 0V -11 VOUT = 2.5V -12 -13 -14 -15 -16 -17 -18 -19
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
-20 -50
-25
50 25 0 75 TEMPERATURE (C)
100
125
6550/51 G03
65501f
5
LT6550/LT6551 5V/3.3V TYPICAL PERFOR A CE CHARACTERISTICS
VEE (Pin 5) = 0V (LT6550), GND (Pin 5) = 0V (LT6551) Input Bias Current vs Input Voltage
0 VS = 3.3V, 0V
INPUT BIAS CURRENT (A)
INPUT BIAS CURRENT (A)
-5
TA = 125C
-5 -10 -15 -20 -25 -30 1.4 1.6
6550/51 G04
TA = 125C
OUTPUT SATURATION VOLTAGE (V)
-10 TA = 25C -15 TA = -55C
-20
-25
0
0.2
0.4
0.6 0.8 1.0 1.2 INPUT VOLTAGE (V)
Output Saturation Voltage vs Load Current (Output Low)
1
OUTPUT SATURATION VOLTAGE (V) OUTPUT SHORT-CIRCUIT CURRENT (mA)
VS = 5V, 0V VIN = -0.1V
70 65 60 55 50 45 -50 -25 0 25 50 75 TEMPERATURE (C) 100 125 VS = 3.3V, 0V
GAIN (dB)
TA = 125C 0.1 TA = 25C
TA = -55C
0.01 0.01
1 0.10 10 SINKING LOAD CURRENT (mA)
100
6550/51 G07
Gain Flatness vs Frequency
6.2 VS = 3.3V, 0V VOUT = 1.5V DC RL = 150
BANDWIDTH (MHz)
6.1
100 80 60
3.3V, 0V, -3dB
-3dB BANDWIDTH (MHz)
GAIN (dB)
6.0
5.9
5.8 20 5.7 10k 0 -50
100k
1M 10M FREQUENCY (Hz)
100M
6550/51 G10
6
UW
0 0 90 85 80 75 140 120 40
Input Bias Current vs Input Voltage
VS = 5V, 0V 1
Output Saturation Voltage vs Load Current (Output High)
VS = 5V, 0V VIN = 2.6V
TA = 125C 0.1 TA = 25C TA = -55C
TA = 25C
TA = -55C
0.5
1.0 1.5 INPUT VOLTAGE (V)
2.0
2.5
6550/51 G05
0.01 0.01
1 0.1 10 SOURCING LOAD CURRENT (mA)
100
6550/51 G06
Output Short-Circuit Current vs Temperature
VIN = 1V 10 9 8 VS = 5V, 0V 7 6 5 4 3 2 1
Gain and Phase vs Frequency
0 VS = 3.3V, 0V VOUT = 1.5V DC RL = 150 PHASE -20 -40 -60
PHASE (DEG)
GAIN
-80 -100 -120 -140 -160 -180
0 10k
100k
1M 10M FREQUENCY (Hz)
-200 100M 500M
6550/51 GO9
6550/51 G08
-3dB, -0.25dB Bandwidth vs Temperature
VOUT = 1.5V DC RL = 150 5V, 0V, -3dB 260 240 220 200 180 160 140 120 100 80 -25 0 25 50 75 TEMPERATURE (C) 100 125
-3dB Bandwidth vs VCC
VOUT = 1.5V DC GND = 0V RL = 150
5V, 0V, -0.25dB
3.3V, 0V, -0.25dB
3
4
5
6
7 8 VCC (V)
9
10
11
12
6550/51 G11
6550/51 G12
65501f
LT6550/LT6551 5V/3.3V TYPICAL PERFOR A CE CHARACTERISTICS
VEE (Pin 5) = 0V (LT6550), GND (Pin 5) = 0V (LT6551) Frequency Response with Capacitive Loads
12 11 10 9 VS = 5V, 0V VOUT = 2.5V DC RL = 150 CL = 100pF CL = 50pF CL = 150pF 45 40 35 VS = 5V, 0V
GAIN (dB)
8 7 6 5 4 3 2 10k 100k
OVERSHOOT (%)
30 25
SLEW RATE (V/s)
CL = 10pF
1M 10M FREQUENCY (Hz)
100M 500M
6550/51 G13
Power Supply Rejection Ratio vs Frequency
60
POWER SUPPLY REJECTION RATIO (dB)
50 40 30 20 10
+PSSR
VS = 5V, 0V VOUT = 2.5V DC RL = 150
OUTPUT IMPEDANCE ()
GAIN(dB)
0 10k
100k
1M 10M FREQUENCY (Hz)
100M
1000M
6550/51 G16
Gain Matching vs Frequency
0 -30
-0.2
GAIN MATCHING(dB)
DISTORTION (dBc)
-0.4
-0.6
-0.8 VS = 3.3V, 0V VOUT = 1.5V DC, ANY CHANNEL PAIR 100k 1M 10M FREQUENCY (Hz) 100M 1000M -80 -90 100k CL = 20pF VS = 5V, 0V VOUT = 2.5V DC RL = 150
6550/51 G21
-1.0 10k
6550/51 G19
UW
20 15 10 5 0 10 100 10 1 0.1 10k -50 -60 -70
Capacitive Load Handling, Overshoot vs Capacitive Load
500 450 RL = OPEN 400 350 300 250
Slew Rate vs Temperature
RL = 150 5V, 0V, RISING
5V, 0V, FALLING
RL = 150
3.3V, 0V, RISING 3.3V, 0V, FALLING
200 150 -50 -25
100 CAPACITIVE LOAD (pF)
1000
6550/51 G14
50 25 75 0 TEMPERATURE (C)
100
125
6550/51 G15
Output Impedance vs Frequency
VS = 5V, 0V VOUT = 2.5V DC 100 90 80 70 60 50 40 30 20 10 100k 1M 10M FREQUENCY (Hz) 100M
6550/51 G17
Channel Separation vs Frequency
VS = 5V, 0V RL = 150 ANY CHANNEL PAIR
0 10k
100k
1M 10M FREQUENCY (Hz)
100M
1000M
6550/51 G18
2nd and 3rd Harmonic Distortion vs Frequency
VS = 3.3V, 0V VO = 2VP-P (0.5V TO 2.5V) -40 RL = 150
Small Signal Response
2ND 3RD
1M FREQUENCY (Hz)
10M
6550/51 G20
65501f
7
LT6550/LT6551 5V/3.3V TYPICAL PERFOR A CE CHARACTERISTICS
VEE (Pin 5) = 0V (LT6550), GND (Pin 5) = 0V (LT6551) Large Signal Response
5V TYPICAL PERFOR A CE CHARACTERISTICS
VGND (Pin 4) = 0V Supply Current vs Total Supply Voltage
14 12 VOUT = 0V -10
INPUT BIAS CURRENT (A)
SUPPLY CURRENT (mA)
TA = 125C 10 8 6 4 2 0 0 TA = 25C TA = -55C
-15
TA = 125C TA = 25C TA = -55C
OUTPUT OFFSET VOLTAGE (mV)
2 3 4 5 1 TOTAL SUPPLY VOLTAGE (V)
6
6550/51 G23
Output Voltage Matching vs Temperature of Three Typical Parts
25
OUTPUT SHORT-CIRCUIT CURRENT (mA)
OUTPUT VOLTAGE MATCHING (mV)
20
VS = 5V VIN = 0V ANY CHANNEL PAIR
GAIN(dB)
15
10
5
0 -50 -25
50 25 75 0 TEMPERATURE (C)
100
125
6550/51 G26
8
UW
-20 -25 95 90 85 80 75 70 -50 -25
CL = 20pF VS = 5V, 0V VOUT = 0.5V TO 3.5V RL = 150
6550/51 G22
UW
(LT6550 Only) Output Offset Voltage vs Temperature of Three Typical Units
60 50 40 30 20 10 0 -10 VS = 5V VIN = 0V
Input Bias Current vs Input Voltage
VS = 5V
-30 -2.5 -2.0 -1.5 -1.0 -0.5 0 0.5 1.0 1.5 2.0 2.5 INPUT VOLTAGE (V)
6550/51 G24
-20 -50 -25
0
25
50
75
100
125
TEMPERATURE (C)
6550/51 G25
Output Short-Circuit Current vs Temperature
VS = 5V VIN = 1V 10 9 8 SINKING 7 6 5 4 3 2 1 50 25 75 0 TEMPERATURE (C) 100 125
Gain and Phase vs Frequency
0 PHASE -20 -40 -60 GAIN
PHASE (DEG)
-80 -100 -120 -140
SOURCING
VS = 5V VOUT = 0V DC RL = 150 100k 1M 10M FREQUENCY (Hz) 100M
-160 -180 -200 1000M
0 10k
6550/51 G27
6550/51 G28
65501f
LT6550/LT6551 5V TYPICAL PERFOR A CE CHARACTERISTICS
VGND (Pin 4) = 0V Gain Flatness vs Frequency
6.2 VS = 5V VOUT = 0V DC RL = 150
GAIN MATCHING(dB)
6.1
GAIN (dB)
GAIN (dB)
6.0
5.9
5.8
5.7 10k
100k
1M 10M FREQUENCY (Hz)
100M
6550/51 G29
Slew Rate
800 750
SLEW RATE (/V s) POWER SUPPLY REJECTION RATIO (dB)
VS = 5V RL = 150 RISING
700 650 600 550 500 -50 -25
40 30 20 10 0 -10 10k -PSRR
OUTPUT IMPEDANCE ()
FALLING
50 25 75 0 TEMPERATURE (C)
100
125
6550/51 G32
Channel Separation vs Frequency
100 90 80 70
GAIN (dB)
VS = 5V RL = 150 ANY CHANNEL PAIR
DISTORTION (dBc)
60 50 40 30 20 10 0 10k 100k 1M 10M FREQUENCY (Hz) 100M 1000M
6550/51 G35
UW
(LT6550 Only) Frequency Response with Capacitive Loads
12 11 VS = 5V VOUT = 0V DC RL = 150
Gain Matching vs Frequency
0
-0.2
10 9
CL = 150pF CL = 100pF CL = 50pF
-0.4
8 7 6 5
-0.6
CL = 10pF
-0.8 VS = 5V ANY CHANNEL PAIR 100k 1M 10M FREQUENCY (Hz) 100M 1000M
4 3 2 10k MM 100k 1M 10M FREQUENCY (Hz) 100M 500M
6550/51 G31
-1.0 10k
6550/51 G30
Power Supply Rejection Ratio vs Frequency
60 50 +PSRR VS = 5V VOUT = 0V DC RL = 150 100
Output Impedance vs Frequency
VS = 5V VOUT = 0V DC
10
1
100k
1M 10M FREQUENCY (Hz)
100M
1000M
0.1 10k
100k
1M 10M FREQUENCY (Hz)
100M
6550/51 G34
6550/51 G33
2nd and 3rd Harmonic Distortion vs Frequency
VS = 5V VO = 2VP-P -40 RL = 150 -50 0V -60 -70 -80 -90 100k 2ND 3RD -30
Large Signal Response
CL = 20pF VS = 5V RL = 150 1M FREQUENCY (Hz) 10M
6550/51 G36
6550/51 G37
65501f
9
LT6550/LT6551
BLOCK DIAGRA S
LT6550 Block Diagram
450 IN1 - OA + 450 IN2 - OA + 450 IN3 - OA + OUT3 GND IN4 450 OUT2 IN3 450 OUT1 IN2 450 VCC IN1
VEE
6550 BD01
10
W
LT6551 Block Diagram
450 450 VCC - OA + 450 450 OUT1
- OA + 450 450 OUT2
- OA + 450 450 OUT3
- OA + N/C GND
6551 BD02
OUT4
65501f
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 voltage exceeds 1.4V. The input stage drives the degeneration 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 current 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
RF 450 I1 I2 I3 R2 R3 Q13
Q2 V+ DESD1 IN DESD2 GND D1 D2 RIN 225
Q3 R1
+
D3 D4
Q1
Q4
RG 450
Figure 1. LT6551 Simplified Schematic
65501f
U
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 maximum 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.
V+ Q5 Q7 Q9 Q10 CM V+ DESD3 Q6 Q8
W
U
U
-
COMPLEMENTARY DRIVE GENERATOR
OUT DESD4
Q11
Q12
GND
Q14 I4 R4 R5 GND
6551 F01
11
LT6550/LT6551
APPLICATIO S I FOR ATIO
Power Dissipation
The LT6550/LT6551, enhanced JA MS package, has Pin 5 (VEE for the LT6550 and GND for the LT6551) fused to the lead frame. This thermal connection increases the efficiency of the PC board as a heat sink. The PCB material can be very effective at transmitting heat between the pad area attached to Pin 5 and a ground or power plane layer. Copper board stiffeners and plated through holes can also be used to spread the heat generated by the device. Table 1 lists the thermal resistance for several different board sizes and copper areas. All measurements were taken on 3/32" FR-4 board with 2oz copper. This data can be used as a rough guideline in estimating thermal resistance. The thermal resistance for each application will be affected by thermal interactions with other components as well as board size and shape.
Table 1. Fused 10-Lead MSOP Package
COPPER AREA TOPSIDE* (mm2) 540 100 100 30 0 BACKSIDE (mm2) 540 100 0 0 0 BOARD AREA (mm2) 2500 2500 2500 2500 2500 THERMAL RESISTANCE (JUNTION-TO-AMBIENT) 110C/W 120C/W 130C/W 135C/W 140C/W
*Device is mounted on topside.
As an example, calculate the junction temperature for the circuit in Figure 2 assuming an 85C ambient temperature. The device dissipation can be found by measuring the supply current, calculating the total dissipation and then subtracting the dissipation in the load.
12
U
The dissipation for the amplifiers is: PD = (106mA)(5V) - 4 * (2.5V)2/150 = 363mW The total package power dissipation is 363mW. When a 2500 sq mm PC board with 540 sq mm of 2oz copper on top and bottom is used, the thermal resistance is 110C/W. The junction temperature (TJ) is: TJ = (363mW)(110C/W) + 85C = 125C The maximum junction temperature for the LT6551 is 150C so the heat sinking capability of the board is adequate for the application.
LT6551 450 450 5V - OA + 450 1.25V - OA + 450 450 75 - OA + 450 450 75 - OA + GND 75
6551 F02
W
U
U
75 75
450
75
75
75
Figure 2. Calculating Junction Temperature
65501f
LT6550/LT6551
TYPICAL APPLICATIO U
S Video Splitter
470F LUMINANCE 75 1k 4k 1 LT6551 450 450 10 - OA + 2 450 450 VCC = 5V LUMINANCE OUT2 9 75 VCC = 5V 470F CHROMA 75 1k 4k 3 450 450 - OA + 8 75 LUMINANCE OUT1 S-VIDEO CONNECTOR CHROMA OUT1 7 75 - OA + 4 450 450 OUT1 5 - OA + 6 75
6551 TA02
S-VIDEO CHROMA CONNECTOR OUT2
OUT2
65501f
13
LT6550/LT6551
TYPICAL APPLICATIO
Consumer products require generation of YPBPR luminance/chrominance component signals, often from RGB source content. The YPBPR format has a luminance signal and two weighted color difference signals at baseband. Even with their fixed internal gain resistors, two LT6550s connected as shown easily implement the required conversion matrix equations. The Y channel is a weighted average of the 2X amplified RGB signals and with the feedback connection of the Y channel output in the second LT6550 back to the gain-resistor common pin, an implicit Y subtraction is performed for the chroma channels and
LT6550 450
R 75
1 450
G 75
2 450
B 75
3 4
14
U
the desired unity gain is produced for the Y-channel. The necessary scaling of the color-difference signals is performed passively by their respective output termination resistor networks. Since this circuit naturally produces bipolar chroma signals (0.35V at the cable load) regardless of RGB offset, the simplest implementation is to power the circuit with 3.3V split supplies. With an available output swing of about 5.6V for this supply configuration, the circuit handles video with composite syncs and/ or various offsets without difficulty.
RGB to YPBPR Component-Video Conversion
3.3V 10 450 9 1070 LT6550 450 3.3V 10 450 105 261 450 8 549 2 450 7 2940 3 5 -3.3V Y = 0.299R + 0.587G + 0.114B PB = 0.565(B - Y) PR = 0.713(R - Y) f3dB 44MHz 4 450 450 75 Y - + - 1 + 9 PR - + 450 - + 450 133 PB 174 5 -3.3V
6550/51 TAO3
8
- +
- +
7
65501f
LT6550/LT6551
PACKAGE DESCRIPTIO U
MS Package 10-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1661)
0.889 0.127 (.035 .005) 3.2 - 3.45 (.126 - .136) 3.00 0.102 (.118 .004) (NOTE 3) 10 9 8 7 6 0.497 0.076 (.0196 .003) REF DETAIL "A" 0 - 6 TYP 12345 0.53 0.01 (.021 .006) DETAIL "A" 0.18 (.007) SEATING PLANE 0.17 - 0.27 (.007 - .011) TYP 0.13 0.076 (.005 .003)
MSOP (MS) 0802
5.23 (.206) MIN
0.50 0.305 0.038 (.0197) (.0120 .0015) BSC TYP RECOMMENDED SOLDER PAD LAYOUT
0.254 (.010) GAUGE PLANE
4.90 0.15 (1.93 .006)
3.00 0.102 (.118 .004) NOTE 4
1.10 (.043) MAX
0.86 (.034) REF
NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
0.50 (.0197) BSC
65501f
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
15
LT6550/LT6551
TYPICAL APPLICATIO
10MHz LABORATORY FREQUENCY REFERENCE (4dBm MAX) 50
RELATED PARTS
PART NUMBER LT1259/LT1260 LT1395/LT1396/LT1397 LT1398/LT1399 LT1675/LT1675-1 LT1809/LT1810 DESCRIPTION Dual/Triple 130MHz Current Feedback Amplifiers Single, Dual, Quad 400MHz Current Feedback Amplifier Dual/Triple 300MHz Current Feedback Amplifier 250MHz, Triple and Single RGB Multiplexer with Current Feedback Amplifiers Single/Dual, 180MHz, Rail-to-Rail Input and Output Amplifiers COMMENTS Shutdown, Operates to 15V 800V/s Slew Rate 0.1dB Gain Flatness to 150MHz, Shutdown 100MHz Pixel Switching, -3dB Bandwidth: 250MHz, 1100V/s Slew Rate 350V/s Slew Rate, Shutdown, Low Distortion -90dBc at 5MHz
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507
q
U
10MHz Reference Distribution Amplifier
LT6551 450 4.53k 10nF 1 450 - + OA 450 10 9 50 10nF VCC = 3.3V 1k 450 - 2 450 + OA 8 50 10nF 450 - 3 450 + OA 7 50 10nF 450 - 4 5 + OA 7 50 10nF
6550/51 TA04
65501f LT/TP 0303 2K * PRINTED IN USA
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2002

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