LT6553
650MHz Gain of 2
Triple Video Amplifier
FEATURES
s
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DESCRIPTIO
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650MHz –3dB Small Signal Bandwidth
400MHz –3dB 2V
P-P
Large Signal Bandwidth
150MHz
±0.1dB
Bandwidth
High Slew Rate: 2500V/µs
Fixed Gain of 2 Requires No External Resistors
75dB Channel Separation at 10MHz
50dB Channel Separation at 100MHz
–82dBc 2nd Harmonic Distortion at 10MHz, 2V
P-P
–72dBc 3rd Harmonic Distortion at 10MHz, 2V
P-P
Low Supply Current: 8mA per Amplifier
6ns 0.1% Settling Time for 2V Step
TTL Compatible Enable I
SS
≤
100µA when Disabled
Differential Gain of 0.022%, Differential
Phase of 0.006°
Wide Supply Range:
±2.25V
(4.5V) to
±6V
(12V)
Available in 16-Lead SSOP Package
The LT
®
6553 is a high-speed triple video amplifier with an
internally fixed gain of 2. The individual amplifiers are
optimized for performance with a double terminated 75Ω
video load and feature a 2V
P–P
full signal bandwidth of
400MHz, making them ideal for driving very high-resolu-
tion video signals. Separate power supply pins for each
amplifier boost channel separation to 75dB, allowing the
LT6553 to excel in many high-speed applications.
While the performance of the LT6553 is optimized for dual
supply operation, it can also be used on a single supply as
small as 4.5V. Using dual 5V supplies, each amplifier
draws only 8mA. When disabled, the amplifiers draw less
than 100µA and the output pins become high impedance.
Furthermore, the amplifiers are capable of turning on in
less than 50ns, making them ideal for multiplexing and
portable applications.
The LT6553 is manufactured on Linear Technology’s
proprietary low voltage complementary bipolar process
and is available in the 16-lead SSOP package that fits in the
same PCB area as an SO-8 package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
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RGB Amplifiers
Coaxial Cable Drivers
LCD Projectors
TYPICAL APPLICATIO
1
2
3
LT6553
Triple Video Line Driver
16
15
5V
Large Signal Transient Response
1.5
R
IN
75Ω
+
–
370Ω
370Ω
14
75Ω
75Ω
–5V
75Ω
75Ω
5V
75Ω
75Ω
OUTPUT (V)
V
IN
= 1V
P–P
V
S
=
±5V
1.0 R
L
= 15OΩ
T
A
= 25°C
0.5
0
–0.5
4
370Ω
G
IN
75Ω
5
6
370Ω
370Ω
–
+
370Ω
13
12
11
–1.0
–1.5
–
B
IN
75Ω
–5V
7
8
+
10
0
2
9
–5V
6553 TA01a
U
4
6
8 10 12 14 16 18 20
TIME (ns)
6553 TA01b
U
U
6553f
1
LT6553
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
EN
DGND
INR
AGND
ING
AGND
INB
V
–
1
2
3
4
5
6
7
8
G = +2
G = +2
G = +2
Total Supply Voltage (V
+
to V
–
) ............................ 13.2V
Input Current (Note 2) ........................................
±10mA
Output Current (Continuous) .............................
±70mA
EN to DGND Voltage (Note 2) ................................. 5.5V
Output Short-Circuit Duration (Note 3) ............ Indefinite
Operating Temperature Range (Note 4) ... –40°C to 85°C
Specified Temperature Range (Note 5) .... –40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Junction Temperature ........................................... 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
16 V
+
15 V
+
14 OUTR
13 V
–
12 OUTG
11 V
+
10 OUTB
9
V
–
ORDER PART
NUMBER
LT6553CGN
LT6553IGN
GN PART
MARKING
6553
6553I
GN PACKAGE
16-LEAD PLASTIC SSOP
T
JMAX
= 150°C,
θ
JA
= 135°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
The
q
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
S
=
±5V,
R
L
= 150Ω, C
L
= 1.5pF, V
EN
= 0.4V, V
AGND
, V
DGND
= 0V.
SYMBOL
V
OS
I
IN
R
IN
C
IN
PSRR
I
PSRR
A
V
ERR
A
V
MATCH
V
OUT
I
S
PARAMETER
Input Referred Offset Voltage
Input Current
Input Resistance
Input Capacitance
Power Supply Rejection Ratio
Input Current Power Supply
Rejection
Gain Error
Gain Matching
Maximum Output Voltage Swing
q
ELECTRICAL CHARACTERISTICS
CONDITIONS
V
IN
= 0V, V
OS
= V
OUT
/2
q
q
MIN
TYP
3
–17
MAX
±10
±20
±50
UNITS
mV
mV
µA
kΩ
pF
dB
V
IN
=
±1V
f = 100kHz
V
S
(Total) = 4.5V to 12V (Note 6)
V
S
(Total) = 4.5V to 12V (Note 6)
V
OUT
=
±2V
Any One Channel to Another
q
150
56
400
1
62
1
–1.2
±1
±4
±5
q
q
q
µA/V
%
%
V
V
±3.25
±3.1
±3.5
8
11
14
100
100
50
Supply Current, Per Amplifier
q
Supply Current, Disabled, Total
I
EN
I
SC
SR
–3dB BW
0.1dB BW
Enable Pin Current
Output Short-Circuit Current
Slew Rate
Small Signal –3dB Bandwidth
Gain Flatness
±0.1dB
Bandwidth
V
EN
= 4V
V
EN
= Open
V
EN
= 0.4V
V
EN
= V
+
R
L
= 0Ω, V
IN
=
±1V
±1V
on
±2V
Output Step (Note 9)
V
OUT
= 200mV
P-P
V
OUT
= 200mV
P-P
q
q
q
q
q
22
0.5
–200
±50
1700
–95
0.5
±105
2500
650
150
2
U
mA
mA
µA
µA
µA
µA
mA
V/µs
MHz
MHz
6553f
W
U
U
W W
W
LT6553
The
q
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
S
=
±5V,
R
L
= 150Ω, C
L
= 1.5pF, V
EN
= 0.4V, V
AGND
, V
DGND
= 0V.
SYMBOL
FPBW
FPBW
PARAMETER
Full Power Bandwidth 2V
Full Power Bandwidth 4V
All-Hostile Crosstalk
t
S
t
R
, t
F
dG
dP
HD2
HD3
Settling Time
Small-Signal Rise and Fall Time
Differential Gain
Differential Phase
2nd Harmonic Distortion
3rd Harmonic Distortion
CONDITIONS
V
OUT
= 2V
P-P
(Note 7)
V
OUT
= 4V
P-P
(Note 7)
f = 10MHz, V
OUT
= 2V
P-P
f = 100MHz, V
OUT
= 2V
P-P
0.1% of V
FINAL
, V
STEP
= 2V
10% to 90%, V
OUT
= 200mV
P-P
(Note 8)
(Note 8)
f = 10MHz, V
OUT
= 2V
P-P
f = 10MHz, V
OUT
= 2V
P-P
MIN
270
TYP
400
200
–75
–50
6
550
0.022
0.006
–82
–72
MAX
UNITS
MHz
MHz
dB
dB
ns
ps
%
Deg
dBc
dBc
ELECTRICAL CHARACTERISTICS
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2:
This parameter is guaranteed to meet specified performance
through design and characterization. It is not production tested.
Note 3:
As long as output current and junction temperature are kept below
the Absolute Maximum Ratings, no damage to the part will occur.
Depending on the supply voltage, a heat sink may be required.
Note 4:
The LT6553C is guaranteed functional over the operating
temperature range of –40°C to 85°C.
Note 5:
The LT6553C is guaranteed to meet specified performance from
0°C to 70°C. The LT6553C is designed, characterized and expected to
meet specified performance from –40°C and 85°C but is not tested or QA
sampled at these temperatures. The LT6553I is guaranteed to meet
specified performance from –40°C to 85°C.
Note 6:
The two supply voltage settings for power supply rejection are
shifted from the typical
±V
S
points for ease of testing. The first
measurement is taken at V
+
= 3V, V
–
= –1.5V to provide the required 3V
headroom for the enable circuitry to function with EN, DGND, AGND and
all inputs connected to 0V. The second measurement is taken at V
+
= 8V,
V
–
= –4V.
Note 7:
Full power bandwidth is calculated from the slew rate:
FPBW = SR/(π • V
P-P
)
Note 8:
Differential gain and phase are measured using a Tektronix
TSG120YC/NTSC signal generator and a Tektronix 1780R video
measurement set. The resolution of this equipment is better than 0.05%
and 0.05°. Nine identical amplifier stages were cascaded giving an
effective resolution of better than 0.0056% and 0.0056%.
Note 9:
Slew rate is 100% production tested on the G channel. Slew rate
of the R and B channels is guaranteed through design and
characterization.
6553f
3
LT6553
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current per Amplifier vs
Temperature
12
10
V
S
=
±5V
R
L
=
∞
V
IN
= 0V
12
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
V
EN
= 0V
8
6
4
2
0
–55 –35 –15
V
EN
= 0.4V
5 25 45 65 85 105 125
TEMPERATURE (°C)
6553 G01
Input Referred Offset Voltage vs
Temperature
10.0
7.5
V
S
=
±5V
V
IN
= 0V
20
INPUT BIAS CURRENT (µA)
OFFSET VOLTAGE (mV)
EN PIN CURRENT (µA)
5.0
2.5
0
–2.5
–5.0
–7.5
–10.0
–55 –35 –15
5 25 45 65 85 105 125
TEMPERATURE (°C)
6553 G04
Output Voltage vs Input Voltage
5
4
3
V
S
=
±5V
R
L
= 150Ω
5
T
A
= 125°C
4
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
2
1
0
–1
–2 T
A
= –55°C
–3
–4
–5
–2.5
T
A
= 25°C
3
T
A
= –55°C
T
A
= 25°C
OUTPUT VOLTAGE (V)
–1.5
0.5
1.5
–0.5
INPUT VOLTAGE (V)
4
U W
6553 G07
Supply Current per Amplifier vs
Supply Voltage
V
–
= –V
+
V
EN
, V
DGND
, V
IN
= 0V
10 T
A
= 25°C
8
6
4
2
0
12
10
8
6
4
2
0
Supply Current per Amplifier vs
EN Pin Voltage
T
A
= –55°C
T
A
= 25°C
T
A
= 125°C
V
S
=
±5V
V
DGND
= 0V
V
IN
= 0V
0
1
2
3 4 5 6 7 8 9 10 11 12
TOTAL SUPPLY VOLTAGE (V)
6553 G02
0
0.5
1.0 1.5 2.0 2.5 3.0
EN PIN VOLTAGE (V)
3.5
4.0
6553 G03
Input Bias Current vs
Input Voltage
V
S
=
±5V
0
–20
0
T
A
= 125°C
–20
–40
–60
–80
EN Pin Current vs EN Pin Voltage
V
S
=
±5V
V
DGND
= 0V
T
A
= 125°C
T
A
= –55°C
T
A
= 25°C
T
A
= 25°C
T
A
= –55°C
–40
–100
–120
–60
–2.5
–1.5
0.5
1.5
–0.5
INPUT VOLTAGE (V)
2.5
6553 G05
–140
0
1
3
2
EN PIN VOLTAGE (V)
4
5
6553 G06
Output Voltage Swing vs I
LOAD
(Output High)
V
S
=
±5V
V
IN
= 2V
0
Output Voltage Swing vs I
LOAD
(Output Low)
V
S
=
±5V
V
IN
= –2V
T
A
= 25°C
–2
T
A
= 125°C
–3
T
A
= –55°C
–1
2
T
A
= 125°C
1
–4
0
2.5
0
10 20 30 40 50 60 70 80 90 100
SOURCE CURRENT (mA)
6553 G08
–5
0
10 20 30 40 50 60 70 80 90 100
SINK CURRENT (mA)
6553 G09
6553f
LT6553
TYPICAL PERFOR A CE CHARACTERISTICS
Input Noise Spectral Density
1000
INPUT NOISE (nV/√Hz OR pA/√Hz)
V
S
=
±5V
T
A
= 25°C
INPUT IMPEDANCE (kΩ)
1000
REJECTION RATIO (dB)
100
e
n
i
n
10
1
0.001
0.01
0.1
1
FREQUENCY (kHz)
10
100
6553 G10
Frequency Response vs Output
Amplitude
9
8
7
AMPLITUDE (dB)
6
5
4
3
2
1
0
0.1
1
100
10
FREQUENCY (MHz)
1000
6553 G13
V
S
=
±5V
R
L
= 150Ω
T
A
= 25°C
V
OUT
= 2V
P-P
AMPLITUDE (dB)
0.1
0
– 0.1
– 0.2
– 0.3
– 0.4
– 0.5
0.1
1
R-CHANNEL
B-CHANNEL
V
OUT
= 4V
P-P
AMPLITUDE (dB)
V
OUT
= 200mV
P-P
Frequency Response with
Capacitive Loads
18
16
14
12
AMPLITUDE (dB)
10
8
6
4
2
0
–2
–4
–6
0.1
1
10
100
FREQUENCY (MHz)
1000
6553 G16
OUTPUT IMPEDANCE (Ω)
V
S
=
±5V
V
OUT
= 2V
P-P
R
L
= 150Ω
T
A
= 25°C
C
L
= 4.7pF
DISTORTION (dBc)
C
L
= 0pF
U W
C
L
= 10pF
Input Impedance vs Frequency
V
S
=
±5V
V
IN
= 0V
T
A
= 25°C
70
60
50
40
30
20
10
0.1
0.01
PSRR vs Frequency
±PSRR
V
S
=
±5V
T
A
= 25°C
100
–PSRR
10
+PSRR
1
0.1
1
10
FREQUENCY (MHz)
100
1000
6553 G11
0
0.001
0.01
0.1
1
FREQUENCY (MHz)
10
100
6553 G12
Gain Flatness vs Frequency
0.5
0.4
0.3
0.2
V
S
=
±5V
V
OUT
= 200mV
P-P
R
L
= 150Ω
T
A
= 25°C
TYPICAL PART
0
– 20
– 40
– 60
– 80
Crosstalk vs Frequency
V
S
=
±5V
V
OUT
= 2V
P-P
R
L
= 150Ω
T
A
= 25°C
ALL-
HOSTILE
WORST
ADJACENT
G-CHANNEL
– 100
– 120
100
10
FREQUENCY (MHz)
1000
6553 G14
0.1
1
10
100
FREQUENCY (MHz)
1000
6553 G15
Harmonic Distortion vs Frequency
0
– 10
– 20
– 30
– 40
– 50
– 60
– 70
– 80
– 90
– 100
– 110
– 120
0.01
0.1
1
10
FREQUENCY (MHz)
100
6553 G17
Output Impedance vs Frequency
1000
DISABLED
V
EN
= 4V
100
V
S
=
±5V
V
OUT
= 2V
P-P
R
L
= 150Ω
T
A
= 25°C
10
HD3
HD2
1
ENABLED
V
EN
= 0.4V
0.1
0.01
V
S
=
±5V
R
L
= 150Ω
T
A
= 25°C
100
1000
6553 G18
0.1
10
1
FREQUENCY (MHz)
6553f
5
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