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Электронный компонент: LT1253

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LT1253/LT1254
1
Low Cost Dual and Quad
Video Amplifiers
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.
s
Low Cost
s
Current Feedback Amplifiers
s
Differential Gain: 0.03%, R
L
= 150
, V
S
=
5V
s
Differential Phase: 0.28
, R
L
= 150
, V
S
=
5V
s
Flat to 30MHz, 0.1dB
s
90MHz Bandwidth on
5V
s
Wide Supply Range:
2V(4V) to
14V(28V)
s
Low Power: 60mW per Amplifier at
5V
S
FEATURE
D
U
ESCRIPTIO
s
RGB Cable Drivers
s
Composite Video Cable Drivers
s
Gain Blocks in IF Stages
U
S
A
O
PPLICATI
U
A
O
PPLICATI
TYPICAL
Transient Response
V
S
=
5V
A
V
= 2
R
L
= 150
V
O
= 1V
LT1253/54 TA02
V
IN
V
OUT
R
G
620
R
F
620
75
75
CABLE
75
+
1/2 LT1253
LT1253/54 TA01
A
V
= 1 +
R
F
R
G
AT AMPLIFIER OUTPUT.
6dB LESS AT V
OUT
.
BW = 90MHz
5V
5V
2
LT1253/LT1254
A
U
G
W
A
W
U
W
A
R
BSOLUTE
XI
TI
S
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
W
U
U
PACKAGE/ORDER I FOR ATIO
ORDER PART
NUMBER
ORDER PART
NUMBER
LT1254CN
LT1254CS
S8 PART MARKING
1253
LT1253CN8
LT1253CS8
N PACKAGE
14-LEAD PLASTIC DIP
+
V
D
14
13
12
11
10
9
8
7
6
5
4
3
2
1
OUT A
IN A
+IN A
+IN B
IN B
OUT B
OUT C
V
IN D
OUT D
TOP VIEW
A
+IN D
+IN C
IN C
C
B
S PACKAGE
14-LEAD PLASTIC SOIC
T
JMAX
= 150
C,
JA
= 100
C/ W (N)
T
JMAX
= 150
C,
JA
= 150
C/ W (S)
8
7
6
5
4
3
2
1
+
IN A
+IN A
V
TOP VIEW
N8 PACKAGE
8-LEAD PLASTIC DIP
OUT A
OUT B
V
IN B
+IN B
A
B
S8 PACKAGE
8-LEAD PLASTIC SOIC
Symbol
Parameter
CONDITIONS
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
5
15
mV
+I
B
Noninverting Bias Current
1
15
A
I
B
Inverting Bias Current
20
100
A
A
VOL
Large-Signal Voltage Gain
V
S
=
5V, V
O
=
2V, R
L
= 150
560
1500
V/V
PSRR
Power Supply Rejection Ratio
V
S
=
3V to
12V
60
70
dB
CMRR
Common-Mode Rejection Ratio
V
S
=
5V, V
CM
=
2V
55
65
dB
V
OUT
Maximum Output Voltage Swing
V
S
=
12V, R
L
= 500
7.0
10.5
V
V
S
=
5V, R
L
= 150
2.5
3.7
V
I
OUT
Maximum Output Current
30
55
mA
I
S
Supply Current
Per Amplifier
6
11
mA
R
IN
Input Resistance
1
10
M
C
IN
Input Capacitance
3
pF
Power Supply Range Dual
2
12
V
Single
4
24
V
Channel Separation
f = 10MHz
88
dB
SR
Input Slew Rate
A
V
= 1
125
V/
s
Output Slew Rate
A
V
= 2
250
V/
s
ELECTRICAL CHARACTERISTICS
0
C
T
A
70
C, V
S
=
5V to
12V, unless otherwise noted.
T
JMAX
= 150
C,
JA
= 70
C/ W (N)
T
JMAX
= 150
C,
JA
= 100
C/ W (S)
LT1253/LT1254
3
Symbol
Parameter
CONDITIONS
MIN
TYP
MAX
UNITS
t
r
Small-Signal Rise Time
V
S
=
12V, A
V
= 2
3.5
ns
Rise and Fall Time
V
S
=
5V, A
V
= 2, V
OUT
= 1V
P-P
5.8
ns
t
p
Propagation Delay
V
S
=
5V, A
V
= 2
3.5
ns
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
W U
Small Signal
Small Signal
Small Signal
V
S
A
V
R
L
R
F
R
G
3dB BW (MHz)
0.1dB BW (MHz)
Peaking (dB)
12
1
1000
1100
None
270
51
3.4
12
1
150
1000
None
204
48
1.3
12
1
1000
750
150
110
59
0.1
12
1
150
768
768
89
50
0.1
12
2
1000
715
715
179
76
0.3
12
2
150
715
715
117
62
0
12
5
1000
680
180
106
42
0
12
5
150
680
180
90
47
0
12
10
1000
620
68.1
89
49
0.1
12
10
150
620
68.1
80
46
0.1
5
1
1000
787
None
218
53
1.5
5
1
150
787
None
158
91
0.1
5
1
1000
715
715
76
28
0.1
5
1
150
715
715
70
30
0.1
5
2
1000
620
620
117
58
0.1
5
2
150
620
620
92
52
0.1
5
5
1000
620
150
82
36
0
5
5
150
620
150
72
34
0
5
10
1000
562
61.9
70
35
0
5
10
150
562
61.9
65
28
0
BANDWIDTH
DIFFERENTIAL
DIFFERENTIAL
V
S
A
V
R
L
R
F
R
G
GAIN
PHASE
12
2
1000
750
750
0.01%
0.03
12
2
150
750
750
0.01%
0.12
5
2
1000
750
750
0.03%
0.18
5
2
150
750
750
0.03%
0.28
NTSC VIDEO (Note 1)
ELECTRICAL CHARACTERISTICS
0
C
T
A
70
C, V
S
=
5V to
12V, unless otherwise noted.
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
amplifier stages were cascaded giving an effective resolution of 0.01% and
0.01
.
4
LT1253/LT1254
C
C
HARA TERISTICS
U
W
A
TYPICAL PERFOR
CE
Supply Current vs Supply Voltage
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
12
LT1253/54 TPC01
4
0
8
16
0
10
5
1
2
3
4
6
7
8
9
2
6
10
14
18
55C
25C
125C
175C
Output Saturation Voltage
vs Temperature
TEMPERATURE (C)
OUTPUT SATURATION VOLTAGE (V)
V
+
50
25
75
125
LT1253/54 TPC02
V
0
1.0
1.0
0.5
0.5
25
50
100
R
L
=
2V
V
S
12V
Input Common-Mode Limit
vs Temperature
TEMPERATURE (C)
COMMON-MODE RANGE (V)
2.0
V
+
50
25
75
125
LT1253/54 TPC03
V
0
1.0
1.0
2.0
0.5
1.5
1.5
0.5
25
50
100
V
+
= 2V TO 12V
V
= 2V TO 12V
SETTLING TIME (ns)
OUTPUT STEP (V)
60
LT1253/54 TPC04
20
0
40
80
100
10
10
0
8
6
4
2
2
4
6
8
NONINVERTING
INVERTING
V
S
= 12V
R
F
= R
G
= 1k
INVERTING
NONINVERTING
Settling Time to 10mV
vs Output Step
2nd and 3rd Harmonic Distortion
vs Frequency
FREQUENCY (MHz)
1
70
DISTORTION (dBc)
60
50
40
30
20
10
100
LT1253/54 TPC05
V
S
= 12V
V
O
= 2V
P-P
R
L
= 100
R
F
= 750
A
V
= 10dB
2ND
3RD
Power Supply Rejection
vs Frequency
FREQUENCY (Hz)
POWER SUPPLY REJECTION (dB)
40
80
10k
1M
10M
100M
LT1253/54 TPC06
0
100k
V
S
= 12V
R
L
= 100
R
F
= R
G
= 750
NEGATIVE
20
60
POSITIVE
Spot Noise Voltage and Current
vs Frequency
FREQUENCY (Hz)
10
1
10
100
1k
100k
LT1253/54 TPC07
100
10k
SPOT NOISE (nV/
Hz OR pA/
Hz)
i
n
e
n
+i
n
Output Impedance
vs Frequency
FREQUENCY (Hz)
OUTPUT IMPEDANCE (
)
0.1
100
10k
1M
10M
100M
LT1253/54 TPC08
0.001
100k
0.01
10
V
S
= 12V
1.0
R
F
= R
G
= 2k
R
F
= R
G
= 750
Output Short-Circuit Current
vs Temperature
TEMPERATURE (C)
25
OUTPUT SHORT-CIRCUIT CURRENT (mA)
40
60
100
150
LT1253/54 TPC09
0
50
25
50
75
125
175
30
70
50
LT1253/LT1254
5
C
C
HARA TERISTICS
U
W
A
TYPICAL PERFOR
CE
12V Frequency Response
5V Frequency Response
12V Frequency Response
5V Frequency Response
FREQUENCY (Hz)
1M
6
GAIN (dB)
7
8
9
10M
100M
1G
LT1253/54 TPC12
5
4
3
2
V
S
= 12V
A
V
= 2
R
L
= 150
R
F
= 715
R
G
= 715
120
100
80
60
40
140
160
180
20
PHASE (DEG)
0
PHASE
GAIN
10
11
12
200
FREQUENCY (Hz)
1M
6
GAIN (dB)
7
8
9
10M
100M
1G
LT1253/54 TPC13
5
4
3
2
V
S
= 5V
A
V
= 2
R
L
= 150
R
F
= 620
R
G
= 620
120
100
80
60
40
140
160
180
20
PHASE (DEG)
0
PHASE
GAIN
10
11
12
200
FREQUENCY (Hz)
1M
20
GAIN (dB)
21
22
23
10M
100M
1G
LT1253/54 TPC14
19
18
17
16
V
S
= 12V
A
V
= 10
R
L
= 150
R
F
= 620
R
G
= 68.1
120
100
80
60
40
140
160
180
20
PHASE (DEG)
0
PHASE
GAIN
24
25
26
200
FREQUENCY (Hz)
1M
20
GAIN (dB)
21
22
23
10M
100M
1G
LT1253/54 TPC15
19
18
17
16
V
S
= 5V
A
V
= 10
R
L
= 150
R
F
= 562
R
G
= 61.9
120
100
80
60
40
140
160
180
20
PHASE (DEG)
0
PHASE
GAIN
24
25
26
200
12V Frequency Response
5V Frequency Response
FREQUENCY (Hz)
1M
1
GAIN (dB)
0
1
2
3
10M
100M
1G
LT1253/54 TPC11
2
3
4
5
4
V
S
= 5V
A
V
= 1
R
L
= 150
R
F
= 787
120
100
80
60
40
140
160
180
20
PHASE (DEG)
0
PHASE
GAIN
5
200
FREQUENCY (Hz)
1M
1
GAIN (dB)
0
1
2
3
10M
100M
1G
LT1253/54 TPC10
2
3
4
5
4
V
S
= 12V
A
V
= 1
R
L
= 150
R
F
= 1k
120
100
80
60
40
140
160
180
20
PHASE (DEG)
0
PHASE
GAIN
200
5