LINER LT6551CMS 3.3v triple and quad video amplifier Datasheet

LT6550/LT6551
3.3V Triple and Quad
Video Amplifiers
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FEATURES
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DESCRIPTIO
Single Supply Operation from 3V to 12.6V
Small (3mm × 5mm) MSOP 10-Lead Package
Internal Resistors for a Gain of Two
340V/µs 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: – 40°C to 85°C
24-Bit RGB
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APPLICATIO S
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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.
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.
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TYPICAL APPLICATIO
3.3V Single Supply LT6551 RGB Plus SYNC Cable Driver
LT6551
450Ω
450Ω
RIN
–
OA
+
450Ω
ROUT 75Ω
450Ω
VOUT
75Ω
GIN
75Ω
–
OA
+
450Ω
GOUT 75Ω
450Ω
BIN
75Ω
75Ω
–
OA
+
450Ω
0V
BOUT 75Ω
VIN
450Ω
SYNCIN
75Ω
Output Step Response
3.3V
75Ω
75Ω
–
OA
+
75Ω
0V
VS = 3.3V
VIN = 0.5V TO 1.25V
f = 10MHz
6550/51 TA01b
GND
SYNCOUT
75Ω
6551 TA01a
65501f
1
LT6550/LT6551
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W W
W
ABSOLUTE
AXI U RATI GS
(Note 1)
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 ................ – 40°C to 85°C
Specified Temperature Range (Note 3)
LT6550C/LT6551C ..............................–40°C to 85°C
LT6550I/LT6551I ................................ – 40°C to 85°C
Maximum Junction Temperature .......................... 150°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
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W
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PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
TOP VIEW
IN1
IN2
IN3
GND
VEE
1
2
3
4
5
X2
X2
X2
10
9
8
7
6
VCC
OUT1
OUT2
OUT3
N/C
MS10 PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 110°C/W
(Note 4)
LT6550CMS
LT6550IMS
ORDER PART
NUMBER
TOP VIEW
1
2
3
4
5
IN1
IN2
IN3
IN4
GND
MS10 PART
MARKING
LTB9
LTC1
X2
X2
X2
X2
10
9
8
7
6
VCC
OUT1
OUT2
OUT3
OUT4
LT6551CMS
LT6551IMS
MS10 PART
MARKING
MS10 PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 110°C/W
(Note 4)
LTC2
LTC3
Consult LTC Marketing for parts specified with wider operating temperature ranges.
3.3V ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the specified
temperature range, otherwise specifications are at TA = 25°C. 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.
PARAMETER
CONDITIONS
TYP
MAX
DC Output Accuracy
No Load, VOUT Ideal = 1.5V
●
MIN
30
70
mV
Output Voltage Matching
Between Any Two Outputs
●
25
75
mV
Input Current
Any Input
●
15
65
Input Impedance, ∆VIN/∆IIN
VIN = 0V to 1V
●
Input Noise Voltage Density
µA
300
kΩ
f = 100kHz (Note 10)
12
nV/√Hz
Input Noise Current Density
f = 100kHz (Note 10)
8
pA/√Hz
Voltage Gain (Note 5)
0.25V ≤ VIN ≤ 1.25V
No Load
RL = 150Ω
RL = 75Ω, 0.25V ≤ VIN ≤ 0.75V
Output Voltage Swing Low
Output Voltage Swing High
VIN = – 0.1V
No Load
ISINK = 5mA
ISINK = 10mA
VIN = 1.75V
No Load
RL = 150Ω
RL = 75Ω
●
●
100
UNITS
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
V/V
V/V
V/V
30
150
200
mV
mV
mV
V
V
V
65501f
2
LT6550/LT6551
3.3V ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the specified
temperature range, otherwise specifications are at TA = 25°C. 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.
PARAMETER
CONDITIONS
PSRR
VCC = 3V to 10V, VIN = 0.5V
Minimum Supply Voltage (Note 6)
Output Short-Circuit Current
●
MIN
TYP
40
48
dB
50
mA
mA
●
3
●
35
25
VIN = 1V, VOUT = 0V
Supply Current per Amplifier (Note 7)
8.5
RL = 150Ω, VOUT = 0.5V to 2.5V
Measured from 1V to 2V
●
140
115
UNITS
V
●
Slew Rate (Note 8)
MAX
10
11
mA
mA
250
V/µs
V/µs
Small Signal –3dB Bandwidth
RL = 150Ω
90
MHz
Gain Flatness
Less than 0.25dB
30
MHz
Gain Matching
Any One Channel to Any Other Channel
0.15
dB
Settling Time to 3%
RL = 150Ω, VOUT = 1V to 2.5V
20
ns
Settling Time to 1%
RL = 150Ω, VOUT = 1V to 2.5V
30
ns
% Overshoot
VOUT = 1V to 2.5V, RL = 150Ω
5
%
Differential Gain
RL = 150Ω, Black Level = 0.6V at Device Output
0.09
%
Differential Phase
RL = 150Ω, Black Level = 0.6V at Device Output
0.09
Deg
Channel Separation
Measured at 10MHz
60
dB
5V ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the specified
temperature range, otherwise specifications are at TA = 25°C. 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
CONDITIONS
MIN
TYP
MAX
UNITS
Output Accuracy
No Load, VOUT Ideal = 2.5V
●
30
70
mV
Output Voltage Matching
Between Any Two Outputs
●
40
90
mV
●
15
65
µA
Input Current
Input Impedance, ∆VIN /∆IIN
VIN = 0V to 2V
300
kΩ
Input Noise Voltage Density
f = 100kHz (Note 10)
12
nV/√Hz
Input Noise Current Density
f = 100kHz (Note 10)
8
pA/√Hz
Voltage Gain (Note 5)
0.25V ≤ VIN ≤ 1.75V
No Load
RL = 150Ω
RL = 75Ω, 0.25V ≤ VIN ≤ 1.25V, 0°C ≤ TA ≤ 70°C (Only)
●
●
●
VIN = – 0.1V
No Load
ISINK = 5mA
ISINK = 10mA
●
●
●
VIN = 2.6V
No Load
RL = 150Ω
RL = 75Ω, 0°C ≤ TA ≤ 70°C (Only)
●
●
●
4.6
3.5
2.5
4.8
4.1
3.2
V
V
V
VCC = 3V to 10V, VIN = 0.5V
●
40
48
dB
●
3
Output Voltage Swing Low
Output Voltage Swing High
PSRR
Minimum Supply Voltage (Note 6)
●
100
1.9
1.9
1.85
10
60
90
2.1
2.1
2.15
V/V
V/V
V/V
30
150
200
mV
mV
mV
V
65501f
3
LT6550/LT6551
5V ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the specified
temperature range, otherwise specifications are at TA = 25°C. 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
CONDITIONS
Output Short-Circuit Current
VIN = 1V, VOUT = 0V
0°C ≤ TA ≤ 70°C
– 40°C ≤ TA ≤ 85°C
●
●
MIN
TYP
45
40
30
60
Supply Current per Amplifier (Note 7)
9.5
●
Slew Rate
RL = 150Ω, VOUT = 0.5V to 3.5V,
Measured from 1V to 3V
●
220
180
MAX
UNITS
mA
mA
mA
11.5
12.5
mA
mA
340
V/µs
V/µs
Small Signal –3dB Bandwidth
RL = 150Ω
110
MHz
Gain Flatness
Less than 0.25dB
30
MHz
Gain Matching
Any One Channel to Any Other Channel
0.15
dB
Settling Time to 3%
RL = 150Ω, VOUT = 1V to 2.5V
20
ns
Settling Time to 1%
RL = 150Ω, VOUT = 1V to 2.5V
35
ns
% Overshoot
VOUT = 1V to 2.5V, RL = 150Ω
5
%
Differential Gain
RL = 150Ω, Black Level = 1V at Device Output
0.05
%
Differential Phase
RL = 150Ω, Black Level = 1V at Device Output
0.05
Deg
Channel Separation
Measured at 10MHz
60
dB
±5V ELECTRICAL CHARACTERISTICS
(LT6550 Only) The ● 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
CONDITIONS
Output Offset
Output Voltage Matching
Between Any Two Outputs
Input Current
TYP
MAX
●
MIN
30
70
mV
●
20
60
mV
20
70
●
Input Impedance, ∆VIN /∆IIN
VIN = –1V to 1V
Input Noise Voltage Density
µA
500
kΩ
f = 100kHz (Note 10)
12
nV/√Hz
Input Noise Current Density
f = 100kHz (Note 10)
8
pA/√Hz
Voltage Gain
– 1.75V ≤ VIN ≤ 1.75V
No Load
RL = 150Ω
RL = 75Ω, – 1V ≤ VIN ≤ 1V
●
●
●
1.9
1.9
1.9
VIN = ±2.6V
No Load
RL = 150Ω
RL = 75Ω, 0°C ≤ TA ≤ 70°C (Only)
●
●
●
±4.6
±3.5
±2.6
±4.8
±4.2
±3.2
V
V
V
PSRR
VS = ±2.5V to ±5V,
●
38
48
dB
Output Short-Circuit Current
VO = 0V
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
45
40
30
60
●
●
mA
mA
mA
Output Voltage Swing
●
200
UNITS
Supply Current per Amplifier
2.1
2.1
2.1
8.5
●
Slew Rate
Small Signal –3dB Bandwidth
RL = 150Ω, VOUT = –3V to 3V,
Measured from –2V to 2V
RL = 150Ω
●
400
300
10.5
12
V/V
V/V
V/V
mA
mA
600
V/µs
V/µs
90
MHz
65501f
4
LT6550/LT6551
±5V ELECTRICAL CHARACTERISTICS
(LT6550 Only) The ● 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
CONDITIONS
Gain Flatness
Less than 0.25dB
MIN
TYP
MAX
UNITS
30
MHz
Gain Matching
Any One Channel to Any Other Channel
0.15
dB
Settling Time to 3%
RL = 150Ω, VOUT = 1V to 2.5V
20
ns
Settling Time to 1%
RL = 150Ω, VOUT = 1V to 2.5V
30
ns
% Overshoot
VOUT = 1V to 2.5V, RL = 150Ω
5
%
Differential Gain
RL = 150Ω, Black Level = 0V at Device Output
0.15
%
Differential Phase
RL = 150Ω, Black Level = 0V at Device Output
0.09
Deg
Channel Separation
Measured at 10MHz
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.
U W
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
12
TA = 125°C
3.0
TA = 25°C
10
2.5
TA = –55°C
8
VOUT (V)
SUPPLY CURRENT (mA)
3.5
VIN = 0.75V
RL = ∞
GND = 0V
6
VS = 3.3V, 0V
RL = 150Ω
–10
TA = 125°C
1.5
1.0
2
0.5
0
0
–12
TA = –55°C
2.0
4
VS = 5V, 0V
–11 VOUT = 2.5V
TA = 25°C
INPUT BIAS (µA)
14
Input Bias Current vs
Temperature
Output Voltage vs Input Voltage
–13
–14
–15
–16
–17
–18
0
1
2
3
4
5 6
VCC (V)
7
8
9
10
6550/51 G01
–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
U W
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
–5
–5
TA = 125°C
–10
TA = 25°C
–15
TA = –55°C
–20
TA = 125°C
–10
–15
TA = 25°C
–20
TA = –55°C
–25
0
0.2
0.4
0.6 0.8 1.0 1.2
INPUT VOLTAGE (V)
–30
1.4 1.6
0.5
0
1.0
1.5
INPUT VOLTAGE (V)
2.0
Output Saturation Voltage vs
Load Current (Output Low)
TA = 25°C
TA = –55°C
0.01
0.01
1
0.10
10
SINKING LOAD CURRENT (mA)
100
9
85
8
80
70
–120
3
–140
2
–160
50
1
–180
45
–50
0
10k
60
VS = 3.3V, 0V
55
–25
0
25
50
75
TEMPERATURE (°C)
120
BANDWIDTH (MHz)
GAIN (dB)
125
100k
100M
6550/51 G10
1M
10M
FREQUENCY (Hz)
–200
100M 500M
6550/51 GO9
–3dB Bandwidth vs VCC
260
VOUT = 1.5V DC
RL = 150Ω
3.3V, 0V, –3dB
80
60
5V, 0V, –0.25dB
40
0
–50
VOUT = 1.5V DC
GND = 0V
RL = 150Ω
240
5V, 0V, –3dB
100
3.3V, 0V, –0.25dB
20
1M
10M
FREQUENCY (Hz)
100
6550/51 G08
VS = 3.3V, 0V
VOUT = 1.5V DC
RL = 150Ω
100k
–80
GAIN
–100
5.8
5.7
10k
–60
6
4
140
5.9
–40
PHASE
–3dB, –0.25dB Bandwidth vs
Temperature
6.0
–20
5
65
Gain Flatness vs Frequency
6.1
0
VS = 3.3V, 0V
VOUT = 1.5V DC
RL = 150Ω
7
VS = 5V, 0V
75
100
Gain and Phase vs Frequency
VIN = 1V
6550/51 G07
6.2
1
0.1
10
SOURCING LOAD CURRENT (mA)
10
GAIN (dB)
OUTPUT SHORT-CIRCUIT CURRENT (mA)
0.1
TA = –55°C
PHASE (DEG)
OUTPUT SATURATION VOLTAGE (V)
90
TA = 125°C
0.1
6550/51 G06
Output Short-Circuit Current
vs Temperature
VS = 5V, 0V
VIN = –0.1V
TA = 125°C
TA = 25°C
6550/51 G05
6550/51 G04
1
VS = 5V, 0V
VIN = 2.6V
0.01
0.01
2.5
–3dB BANDWIDTH (MHz)
–25
1
VS = 5V, 0V
OUTPUT SATURATION VOLTAGE (V)
VS = 3.3V, 0V
INPUT BIAS CURRENT (µA)
INPUT BIAS CURRENT (µA)
0
Output Saturation Voltage vs
Load Current (Output High)
Input Bias Current vs Input
Voltage
220
200
180
160
140
120
100
80
–25
0
25
50
75
TEMPERATURE (°C)
100
125
6550/51 G11
3
4
5
6
7
8
VCC (V)
9
10
11
12
6550/51 G12
65501f
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LT6550/LT6551
U W
5V/3.3V TYPICAL PERFOR A CE CHARACTERISTICS
VEE (Pin 5) = 0V (LT6550), GND (Pin 5) = 0V (LT6551)
Frequency Response with
Capacitive Loads
Capacitive Load Handling,
Overshoot vs Capacitive Load
GAIN (dB)
9
CL = 150pF
CL = 50pF
7
6
CL = 10pF
5
RL = OPEN
30
25
RL = 150Ω
20
15
4
10
3
5
2
10k
1M
10M
FREQUENCY (Hz)
10
100M 500M
VS = 5V, 0V
VOUT = 2.5V DC
RL = 150Ω
100
CAPACITIVE LOAD (pF)
30
20
50
25
75
0
TEMPERATURE (°C)
100
125
6550/51 G15
Channel Separation vs Frequency
100
VS = 5V, 0V
VOUT = 2.5V DC
VS = 5V, 0V
RL = 150Ω
ANY CHANNEL PAIR
90
80
70
10
1
60
50
40
30
20
10
10
0
10k
100k
1M
10M
FREQUENCY (Hz)
100M
0.1
10k
1000M
100k
1M
10M
FREQUENCY (Hz)
6550/51 G16
100M
0
10k
100k
1M
10M
FREQUENCY (Hz)
2nd and 3rd Harmonic Distortion
vs Frequency
0
100M
1000M
6550/51 G18
6550/51 G17
Gain Matching vs Frequency
Small Signal Response
–30
VS = 3.3V, 0V
VO = 2VP-P (0.5V TO 2.5V)
–40 RL = 150Ω
DISTORTION (dBc)
–0.2
GAIN MATCHING(dB)
3.3V, 0V, RISING
250
150
–50 –25
1000
GAIN(dB)
40
300
Output Impedance vs Frequency
100
OUTPUT IMPEDANCE (Ω)
POWER SUPPLY REJECTION RATIO (dB)
+PSSR
5V, 0V, FALLING
350
6550/51 G14
Power Supply Rejection Ratio vs
Frequency
50
400
3.3V, 0V, FALLING
6550/51 G13
60
5V, 0V, RISING
200
0
100k
RL = 150Ω
450
35
CL = 100pF
8
500
VS = 5V, 0V
40
SLEW RATE (V/µs)
10
VS = 5V, 0V
VOUT = 2.5V DC
RL = 150Ω
OVERSHOOT (%)
11
Slew Rate vs Temperature
45
12
–0.4
–0.6
–50
–60
–70
2ND
3RD
–0.8
–80
VS = 3.3V, 0V
VOUT = 1.5V DC, ANY CHANNEL PAIR
–1.0
10k
100k
1M
10M
FREQUENCY (Hz)
100M
1000M
6550/51 G19
–90
100k
1M
FREQUENCY (Hz)
10M
CL = 20pF
VS = 5V, 0V
VOUT = 2.5V DC
RL = 150Ω
6550/51 G21
6550/51 G20
65501f
7
LT6550/LT6551
U W
5V/3.3V TYPICAL PERFOR A CE CHARACTERISTICS
VEE (Pin 5) = 0V (LT6550), GND (Pin 5) = 0V (LT6551)
Large Signal Response
6550/51 G22
CL = 20pF
VS = 5V, 0V
VOUT = 0.5V TO 3.5V
RL = 150Ω
±5V TYPICAL PERFOR A CE CHARACTERISTICS
(LT6550 Only)
U W
VGND (Pin 4) = 0V
Supply Current vs Total Supply
Voltage
14
Input Bias Current vs Input
Voltage
–10
VOUT = 0V
Output Offset Voltage vs
Temperature of Three Typical Units
60
VS = ±5V
TA = 25°C
8
TA = –55°C
6
4
TA = 125°C
–15
TA = 25°C
TA = –55°C
–20
–25
2
0
±2
±3
±4
±5
±1
TOTAL SUPPLY VOLTAGE (V)
30
20
10
0
5
0
–50 –25
50
25
75
0
TEMPERATURE (°C)
Output Short-Circuit Current
vs Temperature
100
125
6550/51 G26
50
75
100
VS = ±5V
VIN = ±1V
0
PHASE
9
90
–20
–40
8
85
80
SOURCING
75
125
6550/51 G27
–80
5
–100
4
–120
3
–140
1
100
GAIN
6
2
50
25
75
0
TEMPERATURE (°C)
–60
7
SINKING
70
–50 –25
125
Gain and Phase vs Frequency
10
GAIN(dB)
OUTPUT SHORT-CIRCUIT CURRENT (mA)
10
25
TEMPERATURE (°C)
–160
VS = ±5V
VOUT = 0V DC
RL = 150Ω
0
10k
100k
1M
10M
FREQUENCY (Hz)
PHASE (DEG)
15
0
6550/51 G25
95
VS = ±5V
VIN = 0V
ANY CHANNEL PAIR
–20
–50 –25
6550/51 G24
Output Voltage Matching vs
Temperature of Three Typical Parts
OUTPUT VOLTAGE MATCHING (mV)
40
–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)
±6
6550/51 G23
20
VS = ±5V
VIN = 0V
–10
0
25
50
OUTPUT OFFSET VOLTAGE (mV)
TA = 125°C
10
INPUT BIAS CURRENT (µA)
SUPPLY CURRENT (mA)
12
–180
100M
–200
1000M
6550/51 G28
65501f
8
LT6550/LT6551
±5V TYPICAL PERFOR A CE CHARACTERISTICS
(LT6550 Only)
U W
VGND (Pin 4) = 0V
12
11
–0.2
6.0
5.9
10
–0.4
–0.6
1M
10M
FREQUENCY (Hz)
–1.0
10k
100M
100k
1M
10M
FREQUENCY (Hz)
100M
60
POWER SUPPLY REJECTION RATIO (dB)
SLEW RATE (/V µs)
750
RISING
700
650
FALLING
600
550
500
–50 –25
50
25
75
0
TEMPERATURE (°C)
100
50
+PSRR
60
50
40
30
20
30
20
10
100k
1M
10M
FREQUENCY (Hz)
100M
1000M
1M
10M
FREQUENCY (Hz)
100M
1000M
6550/51 G35
1
0.1
10k
100k
1M
10M
FREQUENCY (Hz)
100M
6550/51 G34
2nd and 3rd Harmonic Distortion
vs Frequency
Large Signal Response
–30
VS = ±5V
VO = 2VP-P
–40 RL = 150Ω
–50
0V
–60
2ND
3RD
–70
–80
100k
10
0
CL = 20pF
VS = ±5V
RL = 150Ω
10
0
10k
100M 500M
VS = ±5V
VOUT = 0V DC
6550/51 G33
DISTORTION (dBc)
GAIN (dB)
70
100
–PSRR
–10
10k
125
VS = ±5V
RL = 150Ω
ANY CHANNEL PAIR
80
1M
10M
FREQUENCY (Hz)
Output Impedance vs Frequency
40
Channel Separation vs Frequency
90
100k
6550/51 G31
VS = ±5V
VOUT = 0V DC
RL = 150Ω
6550/51 G32
100
2
10k
MM
1000M
Power Supply Rejection Ratio vs
Frequency
Slew Rate
VS = ±5V
RL = 150Ω
CL = 10pF
6550/51 G30
6550/51 G29
800
6
3
OUTPUT IMPEDANCE (Ω)
100k
CL = 50pF
7
4
VS = ±5V
ANY CHANNEL PAIR
5.7
10k
CL = 150pF
CL = 100pF
8
5
–0.8
5.8
VS = ±5V
VOUT = 0V DC
RL = 150Ω
9
GAIN (dB)
GAIN (dB)
6.1
0
VS = ±5V
VOUT = 0V DC
RL = 150Ω
GAIN MATCHING(dB)
6.2
Frequency Response with
Capacitive Loads
Gain Matching vs Frequency
Gain Flatness vs Frequency
–90
100k
1M
FREQUENCY (Hz)
6550/51 G37
10M
6550/51 G36
65501f
9
LT6550/LT6551
W
BLOCK DIAGRA S
LT6551 Block Diagram
LT6550 Block Diagram
450Ω
450Ω
450Ω
IN1
VCC
VCC
–
OA
+
–
OA
+
450Ω
450Ω
IN1
OUT1
450Ω
450Ω
OUT1
450Ω
IN2
IN2
–
OA
+
–
OA
+
450Ω
OUT2
450Ω
450Ω
OUT2
450Ω
IN3
IN3
–
OA
+
–
OA
+
OUT3
450Ω
OUT3
450Ω
IN4
GND
–
OA
+
N/C
VEE
6550 BD01
GND
OUT4
6551 BD02
65501f
10
LT6550/LT6551
U
U
W
U
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.
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.
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
V+
RF
450Ω
I1
I2
R2
I3
R3
Q13
Q2
V+
DESD1
Q7
Q9
Q10
CM
V+
DESD3
+
IN
GND
Q5
R1
RIN
225Ω
DESD2
Q3
Q1
D1
D3
D2
D4
Q4
Q6
Q8
–
COMPLEMENTARY
DRIVE
GENERATOR
OUT
DESD4
Q11
GND
Q12
Q14
RG
450Ω
I4
R4
R5
GND
6551 F01
Figure 1. LT6551 Simplified Schematic
65501f
11
LT6550/LT6551
U
W
U
U
APPLICATIO S I FOR ATIO
Power Dissipation
The dissipation for the amplifiers is:
The LT6550/LT6551, enhanced θJA 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.
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
110°C/W. The junction temperature (TJ) is:
TJ = (363mW)(110°C/W) + 85°C = 125°C
The maximum junction temperature for the LT6551 is
150°C so the heat sinking capability of the board is
adequate for the application.
LT6551
450Ω
5V
–
OA
+
Table 1. Fused 10-Lead MSOP Package
450Ω
COPPER AREA
450Ω
75Ω
450Ω
75Ω
1.25V
TOPSIDE*
(mm2)
BACKSIDE
(mm2)
BOARD AREA
(mm2)
THERMAL RESISTANCE
(JUNTION-TO-AMBIENT)
540
540
2500
110°C/W
100
100
2500
120°C/W
100
0
2500
130°C/W
30
0
2500
135°C/W
0
0
2500
140°C/W
–
OA
+
450Ω
75Ω
–
OA
+
450Ω
*Device is mounted on topside.
As an example, calculate the junction temperature for the
circuit in Figure 2 assuming an 85°C ambient temperature.
75Ω
450Ω
75Ω
450Ω
75Ω
–
OA
+
75Ω
GND
75Ω
The device dissipation can be found by measuring the
supply current, calculating the total dissipation and then
subtracting the dissipation in the load.
6551 F02
Figure 2. Calculating Junction Temperature
65501f
12
LT6550/LT6551
U
TYPICAL APPLICATIO
S Video Splitter
470µF
4k
1
LUMINANCE
75Ω
LT6551
450Ω
10
1k
–
OA
+
2
450Ω
3
75Ω
450Ω
1k
5
450Ω
LUMINANCE
OUT1
8 75Ω
450Ω
S-VIDEO
CONNECTOR
–
OA
+
4
LUMINANCE
OUT2
450Ω
4k
CHROMA
VCC = 5V
9 75Ω
–
OA
+
VCC = 5V
470µF
450Ω
CHROMA
OUT1
7 75Ω
OUT1
450Ω
–
OA
+
6 75Ω
S-VIDEO
CHROMA CONNECTOR
OUT2
6551 TA02
OUT2
65501f
13
LT6550/LT6551
U
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
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
LT6550
450Ω
3.3V
LT6550
10
450Ω
450Ω
9 1070Ω
–
1
R
+
10
450Ω
–
1
9
105Ω
+
PR
261Ω
75Ω
450Ω
450Ω
450Ω
8 549Ω
–
2
G
75Ω
450Ω
B
450Ω
7 2940Ω
75Ω
75Ω
7
133Ω
Y
450Ω
–
3
+
8
+
450Ω
–
3
–
2
+
450Ω
PB
+
174Ω
4
5
4
–3.3V
5
–3.3V
6550/51 TAO3
Y = 0.299R + 0.587G + 0.114B
PB = 0.565(B – Y)
PR = 0.713(R – Y)
f3dB ≈ 44MHz
65501f
14
LT6550/LT6551
U
PACKAGE DESCRIPTIO
MS Package
10-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1661)
0.889 ± 0.127
(.035 ± .005)
5.23
(.206)
MIN
3.2 – 3.45
(.126 – .136)
3.00 ± 0.102
(.118 ± .004)
(NOTE 3)
0.50
0.305 ± 0.038
(.0197)
(.0120 ± .0015)
BSC
TYP
RECOMMENDED SOLDER PAD LAYOUT
0.254
(.010)
0.497 ± 0.076
(.0196 ± .003)
REF
10 9 8 7 6
3.00 ± 0.102
(.118 ± .004)
NOTE 4
4.90 ± 0.15
(1.93 ± .006)
DETAIL “A”
0° – 6° TYP
GAUGE PLANE
1 2 3 4 5
0.53 ± 0.01
(.021 ± .006)
DETAIL “A”
0.86
(.034)
REF
1.10
(.043)
MAX
0.18
(.007)
SEATING
PLANE
0.17 – 0.27
(.007 – .011)
TYP
0.50
(.0197)
BSC
0.13 ± 0.076
(.005 ± .003)
MSOP (MS) 0802
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
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
U
TYPICAL APPLICATIO
10MHz Reference Distribution Amplifier
LT6551
450Ω
450Ω
4.53k
10MHz LABORATORY
FREQUENCY REFERENCE
(4dBm MAX)
50Ω
10
–
10nF
1
+
450Ω
1k
OA
50Ω
+
450Ω
OA
OA
7
50Ω
10nF
450Ω
–
4
10nF
450Ω
+
450Ω
8
50Ω
–
3
10nF
450Ω
–
2
VCC = 3.3V
9
+
OA
5
7
50Ω
10nF
6550/51 TA04
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1259/LT1260
Dual/Triple 130MHz Current Feedback Amplifiers
Shutdown, Operates to ±15V
LT1395/LT1396/LT1397
Single, Dual, Quad 400MHz Current Feedback Amplifier
800V/µs Slew Rate
LT1398/LT1399
Dual/Triple 300MHz Current Feedback Amplifier
0.1dB Gain Flatness to 150MHz, Shutdown
LT1675/LT1675-1
250MHz, Triple and Single RGB Multiplexer with
Current Feedback Amplifiers
100MHz Pixel Switching, –3dB Bandwidth: 250MHz,
1100V/µs Slew Rate
LT1809/LT1810
Single/Dual, 180MHz, Rail-to-Rail Input and
Output Amplifiers
350V/µs Slew Rate, Shutdown,
Low Distortion –90dBc at 5MHz
65501f
16
Linear Technology Corporation
LT/TP 0303 2K • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2002