LT1253/LT1254
Low Cost Dual and Quad
Video Amplifiers
FEATURES
s
s
s
s
s
s
s
s
DESCRIPTIO
Low Cost
Current Feedback Amplifiers
Differential Gain: 0.03%, R
L
= 150Ω, V
S
=
±5V
Differential Phase: 0.28°, R
L
= 150Ω, V
S
=
±5V
Flat to 30MHz, 0.1dB
90MHz Bandwidth on
±5V
Wide Supply Range:
±2V(4V)
to
±14V(28V)
Low Power: 60mW per Amplifier at
±5V
The LT1253 is a low cost dual current feedback amplifier
for video applications. The LT1254 is a quad version of the
LT1253. The amplifiers are completely isolated except for
the power supply pins and therefore have excellent isola-
tion, over 94dB at 5MHz. Dual and quad amplifiers signifi-
cantly reduce costs compared with singles; the number of
insertions is reduced and fewer supply bypass capacitors
are required. In addition, these duals and quads cost less
per amplifier than single video amplifiers.
The LT1253/LT1254 amplifiers are ideal for driving low
impedance loads such as cables and filters. The wide
bandwidth and high slew rate of these amplifiers make
driving RGB signals between PCs and workstations easy.
The excellent linearity of these amplifiers makes them
ideal for composite video.
The LT1253 is available in 8-pin DIPs and the S8 surface
mount package. The LT1254 is available in 14-pin DIPs
and the S14 surface mount package. Both parts have the
industry standard dual and quad op amp pin out. For
higher performance, see the LT1229/LT1230.
APPLICATI
s
s
s
S
RGB Cable Drivers
Composite Video Cable Drivers
Gain Blocks in IF Stages
TYPICAL APPLICATI
5V
V
IN
+
Transient Response
75Ω
1/2 LT1253
–
–5V
R
F
620Ω
V
OUT
R
G
620Ω
75Ω
75Ω
CABLE
A
V
= 1 +
R
F
BW = 90MHz
R
G
AT AMPLIFIER OUTPUT.
6dB LESS AT V
OUT
.
LT1253/54 • TA01
V
S
=
±5V
A
V
= 2
R
L
= 150Ω
V
O
= 1V
U
LT1253/54 • TA02
UO
UO
1
LT1253/LT1254
ABSOLUTE
AXI U
RATI GS
Storage Temperature Range ................ – 65°C to 150°C
Junction Temperature (Note 2) ............................ 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
Total Supply Voltage (V
+
to V
–
) ............................. 28V
Input Current .....................................................
±15mA
Output Short-Circuit Duration (Note 1) ........ Continuous
Operating Temperature Range
LT1253C, LT1254C................................. 0°C to 70°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
OUT A
–IN A
+IN A
V
–
1
2
A
3
4
B
6
5
–IN B
+IN B
8
7
V
+
OUT B
ORDER PART
NUMBER
LT1253CN8
LT1253CS8
S8 PART MARKING
1253
N8 PACKAGE
8-LEAD PLASTIC DIP
S8 PACKAGE
8-LEAD PLASTIC SOIC
T
JMAX
= 150°C,
θ
JA
= 100°C/ W (N)
T
JMAX
= 150°C,
θ
JA
= 150°C/ W (S)
ELECTRICAL CHARACTERISTICS
Symbol
V
OS
+I
B
– I
B
A
VOL
PSRR
CMRR
V
OUT
I
OUT
I
S
R
IN
C
IN
Parameter
Input Offset Voltage
Noninverting Bias Current
Inverting Bias Current
Large-Signal Voltage Gain
Power Supply Rejection Ratio
Common-Mode Rejection Ratio
Maximum Output Voltage Swing
Maximum Output Current
Supply Current
Input Resistance
Input Capacitance
Power Supply Range
Channel Separation
SR
Input Slew Rate
Output Slew Rate
Dual
Single
0°C
≤
T
A
≤
70°C, V
S
=
±5V
to
±12V,
unless otherwise noted.
MIN
TYP
5
1
20
MAX
15
15
100
UNITS
mV
µA
µA
V/V
dB
dB
V
V
mA
11
mA
MΩ
pF
±12
24
88
125
250
V
V
dB
V/µs
V/µs
CONDITIONS
V
S
=
±5V,
V
O
=
±2V,
R
L
= 150Ω
V
S
=
±3V
to
±12V
V
S
=
±5V,
V
CM
=
±2V
V
S
=
±12V,
R
L
= 500Ω
V
S
=
±5V,
R
L
= 150Ω
Per Amplifier
f = 10MHz
A
V
= 1
A
V
= 2
2
U
U
W
W W
U
W
TOP VIEW
OUT A
1
2
3
4
5
6
7
B
C
A
D
14
OUT D
13 –IN D
12 +IN D
11 V
–
10
+IN C
9
8
–IN C
OUT C
ORDER PART
NUMBER
LT1254CN
LT1254CS
–IN A
+IN A
V
+
+IN B
–IN B
OUT B
N PACKAGE
14-LEAD PLASTIC DIP
S PACKAGE
14-LEAD PLASTIC SOIC
T
JMAX
= 150°C,
θ
JA
= 70°C/ W (N)
T
JMAX
= 150°C,
θ
JA
= 100°C/ W (S)
560
60
55
±7.0
±2.5
30
1
±2
4
1500
70
65
±10.5
±3.7
55
6
10
3
LT1253/LT1254
ELECTRICAL CHARACTERISTICS
Symbol
t
r
t
p
Parameter
Small-Signal Rise Time
Rise and Fall Time
Propagation Delay
0°C
≤
T
A
≤
70°C, V
S
=
±5V
to
±12V,
unless otherwise noted.
MIN
TYP
3.5
5.8
3.5
MAX
UNITS
ns
ns
ns
CONDITIONS
V
S
=
±12V,
A
V
= 2
V
S
=
±5V,
A
V
= 2, V
OUT
= 1V
P-P
V
S
=
±5V,
A
V
= 2
Note 1:
A heat sink may be required to keep the junction temperature
below absolute maximum when the output is shorted indefinitely.
Note 2:
T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formulas:
LT1253CN8: T
J
= T
A
+ (P
D
×
100°C/W)
LT1253CS8: T
J
= T
A
+ (P
D
×
150°C/W)
LT1254CN: T
J
= T
A
+ (P
D
×
70°C/W)
LT1254CS: T
J
= T
A
+ (P
D
×
100°C/W)
TYPICAL AC PERFOR A CE
BANDWIDTH
V
S
±12
±12
±12
±12
±12
±12
±12
±12
±12
±12
±5
±5
±5
±5
±5
±5
±5
±5
±5
±5
A
V
1
1
–1
–1
2
2
5
5
10
10
1
1
–1
–1
2
2
5
5
10
10
R
L
1000
150
1000
150
1000
150
1000
150
1000
150
1000
150
1000
150
1000
150
1000
150
1000
150
R
F
1100
1000
750
768
715
715
680
680
620
620
787
787
715
715
620
620
620
620
562
562
R
G
None
None
150
768
715
715
180
180
68.1
68.1
None
None
715
715
620
620
150
150
61.9
61.9
Small Signal
– 3dB BW (MHz)
270
204
110
89
179
117
106
90
89
80
218
158
76
70
117
92
82
72
70
65
Small Signal
– 0.1dB BW (MHz)
51
48
59
50
76
62
42
47
49
46
53
91
28
30
58
52
36
34
35
28
Small Signal
Peaking (dB)
3.4
1.3
0.1
0.1
0.3
0
0
0
0.1
0.1
1.5
0.1
0.1
0.1
0.1
0.1
0
0
0
0
NTSC VIDEO (Note 1)
V
S
±12
±12
±5
±5
A
V
2
2
2
2
R
L
1000
150
1000
150
R
F
750
750
750
750
R
G
750
750
750
750
DIFFERENTIAL
GAIN
0.01%
0.01%
0.03%
0.03%
DIFFERENTIAL
PHASE
0.03°
0.12°
0.18°
0.28°
Note 1:
Differential Gain and Phase are measured using a Tektronix TSG
120 YC/NTSC signal generator and a Tektronix 1780R Video Measurement
Set. The resolution of this equipment is 0.1% and 0.1°. Ten identical
U W
amplifier stages were cascaded giving an effective resolution of 0.01% and
0.01°.
3
LT1253/LT1254
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Supply Voltage
10
OUTPUT SATURATION VOLTAGE (V)
V
+
–0.5
9
8
SUPPLY CURRENT (mA)
–55°C
25°C
125°C
COMMON-MODE RANGE (V)
7
6
5
4
3
2
1
0
0
2
4
8 10 12 14
6
SUPPLY VOLTAGE (±V)
16
18
175°C
LT1253/54 • TPC01
Settling Time to 10mV
vs Output Step
10
8
6
DISTORTION (dBc)
NONINVERTING
INVERTING
–30
POWER SUPPLY REJECTION (dB)
OUTPUT STEP (V)
4
2
0
–2
–4
–6
–8
–10
0
20
40
60
SETTLING TIME (ns)
80
100
NONINVERTING
INVERTING
V
S
= ±12V
R
F
= R
G
= 1k
LT1253/54 • TPC04
Spot Noise Voltage and Current
vs Frequency
100
OUTPUT IMPEDANCE (Ω)
–i
n
10
OUTPUT SHORT-CIRCUIT CURRENT (mA)
SPOT NOISE (nV/√Hz OR pA/√Hz)
10
e
n
+i
n
1
10
100
1k
10k
FREQUENCY (Hz)
4
U W
LT1253/54 • TPC07
Output Saturation Voltage
vs Temperature
V
+
– 0.5
–1.0
–1.5
–2.0
Input Common-Mode Limit
vs Temperature
–1.0
R
L
=
∞
±2V
≤
V
S
≤
±12V
V
+
= 2V TO 12V
2.0
1.5
1.0
0.5
V
–
– 50 –25
V
–
= –2V TO –12V
1.0
0.5
V
–
–50 –25
50
0
25
75
TEMPERATURE (°C)
100
125
0
25
50
75
TEMPERATURE (°C)
100
125
LT1253/54 • TPC02
LT1253/54 • TPC03
2nd and 3rd Harmonic Distortion
vs Frequency
–20
V
S
= ±12V
V
O
= 2V
P-P
R
L
= 100Ω
R
F
= 750Ω
A
V
= 10dB
Power Supply Rejection
vs Frequency
80
V
S
= ±12V
R
L
= 100Ω
R
F
= R
G
= 750Ω
POSITIVE
40
60
2ND
–40
3RD
–50
NEGATIVE
20
–60
–70
1
10
FREQUENCY (MHz)
100
LT1253/54 • TPC05
0
10k
100k
1M
10M
FREQUENCY (Hz)
100M
LT1253/54 • TPC06
Output Impedance
vs Frequency
100
V
S
= ±12V
70
Output Short-Circuit Current
vs Temperature
60
1.0
R
F
= R
G
= 2k
0.1
R
F
= R
G
= 750Ω
50
0.01
40
100k
0.001
10k
100k
1M
10M
FREQUENCY (Hz)
100M
30
–50 –25
0
25 50 75 100 125 150 175
TEMPERATURE (°C)
LT1253/54 • TPC09
LT1253/54 • TPC08
LT1253/LT1254
TYPICAL PERFOR A CE CHARACTERISTICS
±12V
Frequency Response
5
4
3
2
PHASE
0
–20
–40
–60
GAIN (dB)
0
–1
–2
–3
–4
–5
1M
V
S
= ±12V
A
V
= 1
R
L
= 150Ω
R
F
= 1k
10M
100M
FREQUENCY (Hz)
GAIN
GAIN (dB)
1
±12V
Frequency Response
12
11
10
9
PHASE
0
–20
–40
–60
GAIN (dB)
GAIN (dB)
8
7
6
5
4
3
2
1M
V
S
= ±12V
A
V
= 2
R
L
= 150Ω
R
F
= 715Ω
R
G
= 715Ω
GAIN
10M
100M
FREQUENCY (Hz)
±12V
Frequency Response
26
25
24
23
GAIN (dB)
21
20
19
18
17
16
1M
V
S
= ±12V
A
V
= 10
R
L
= 150Ω
R
F
= 620Ω
R
G
= 68.1Ω
GAIN
GAIN (dB)
22
10M
100M
FREQUENCY (Hz)
U W
±5V
Frequency Response
5
4
3
2
PHASE (DEG)
0
–20
–40
PHASE
–60
PHASE (DEG)
–80
–100
–120
–140
–160
–180
–200
1G
LT1253/54 • TPC10
1
0
–1
–2
–3
–4
–5
1M
V
S
= ±5V
A
V
= 1
R
L
= 150Ω
R
F
= 787Ω
10M
100M
FREQUENCY (Hz)
1G
LT1253/54 • TPC11
–80
–100
GAIN
–120
–140
–160
–180
–200
±5V
Frequency Response
12
11
10
9
PHASE
0
–20
–40
–60
PHASE (DEG)
PHASE (DEG)
–80
–100
–120
–140
–160
–180
–200
1G
LT1253/54 • TPC12
8
7
6
5
4
3
2
1M
V
S
= ±5V
A
V
= 2
R
L
= 150Ω
R
F
= 620Ω
R
G
= 620Ω
GAIN
–80
–100
–120
–140
–160
–180
–200
10M
100M
FREQUENCY (Hz)
1G
LT1253/54 • TPC13
±5V
Frequency Response
0
–20
–40
26
25
24
23
PHASE (DEG)
0
–20
–40
PHASE
–60
PHASE
–60
–80
–100
–120
–140
–160
–180
–200
1G
LT1253/54 • TPC14
PHASE (DEG)
22
21
20
19
18
17
16
1M
V
S
= ±5V
A
V
= 10
R
L
= 150Ω
R
F
= 562Ω
R
G
= 61.9Ω
GAIN
–80
–100
–120
–140
–160
–180
–200
1G
LT1253/54 • TPC15
10M
100M
FREQUENCY (Hz)
5
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