LT1254 [Linear]
Low Cost Dual and Quad Video Amplifiers; 低成本双路和四路视频放大器
| 型号： | LT1254 |
| 厂家： | 
Linear |
| 描述： | Low Cost Dual and Quad Video Amplifiers |
| 文件： | 总8页 (文件大小：248K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1253/LT1254
Low Cost Dual and Quad
Video Amplifiers
U
DESCRIPTIO
EATURE
S
F
■
■
■
■
■
■
■
■
Low Cost
Current Feedback Amplifiers
Differential Gain: 0.03%, RL = 150Ω, VS = ±5V
Differential Phase: 0.28°, RL = 150Ω, VS = ±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.
O U
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.
PPLICATI
RGB Cable Drivers
Composite Video Cable Drivers
Gain Blocks in IF Stages
S
A
■
■
■
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.
U
O
TYPICAL APPLICATI
Transient Response
5V
+
V
IN
75Ω
1/2 LT1253
–
75Ω
CABLE
–5V
R
F
620Ω
V
OUT
R
G
75Ω
620Ω
LT1253/54 • TA02
R
F
A
= 1 +
BW = 90MHz
VS = ±5V
V
R
G
A
V = 2
AT AMPLIFIER OUTPUT.
6dB LESS AT V
RL = 150Ω
O = 1V
.
OUT
V
LT1253/54 • TA01
1
LT1253/LT1254
W W W
U
ABSOLUTE AXI U RATI GS
Total Supply Voltage (V+ to V–) ............................. 28V
Input Current ..................................................... ±15mA
Output Short-Circuit Duration (Note 1)........ Continuous
Operating Temperature Range
Storage Temperature Range ................ – 65°C to 150°C
Junction Temperature (Note 2)............................ 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
LT1253C, LT1254C................................. 0°C to 70°C
W
U
/O
PACKAGE RDER I FOR ATIO
TOP VIEW
ORDER PART
ORDER PART
OUT A
–IN A
+IN A
1
2
3
4
5
6
7
14 OUT D
13 –IN D
NUMBER
NUMBER
TOP VIEW
+
D
C
A
B
OUT A
–IN A
+IN A
1
2
3
4
8
7
6
5
V
12
11
10
9
+IN D
LT1253CN8
LT1253CS8
OUT B
LT1254CN
LT1254CS
–
+
V
V
A
–IN B
+IN B
+IN B
–IN B
OUT B
B
+IN C
–IN C
OUT C
–
V
N8 PACKAGE
8-LEAD PLASTIC DIP
S8 PACKAGE
8-LEAD PLASTIC SOIC
8
S8 PART MARKING
1253
N PACKAGE
S PACKAGE
TJMAX = 150°C, θJA = 100°C/ W (N)
JMAX = 150°C, θJA = 150°C/ W (S)
14-LEAD PLASTIC DIP 14-LEAD PLASTIC SOIC
T
TJMAX = 150°C, θJA = 70°C/ W (N)
T
JMAX = 150°C, θJA = 100°C/ W (S)
ELECTRICAL CHARACTERISTICS 0°C ≤ TA ≤ 70°C, VS = ±5V to ±12V, unless otherwise noted.
Symbol Parameter
CONDITIONS
MIN
TYP
MAX
UNITS
mV
µA
V
Input Offset Voltage
5
15
OS
+I
Noninverting Bias Current
Inverting Bias Current
1
15
B
–I
20
100
µA
B
A
Large-Signal Voltage Gain
Power Supply Rejection Ratio
Common-Mode Rejection Ratio
Maximum Output Voltage Swing
V = ±5V, V = ±2V, R = 150Ω
560
60
1500
70
V/V
dB
VOL
S
O
L
PSRR
CMRR
V = ±3V to ±12V
S
V = ±5V, V = ±2V
55
65
dB
S
CM
V
V = ±12V, R = 500Ω
±7.0
±2.5
±10.5
±3.7
V
V
OUT
S
L
V = ±5V, R = 150Ω
S
L
I
I
Maximum Output Current
Supply Current
30
55
6
mA
mA
MΩ
pF
OUT
S
Per Amplifier
11
R
Input Resistance
1
10
3
IN
IN
C
Input Capacitance
Power Supply Range
Dual
Single
±2
4
±12
24
V
V
Channel Separation
Input Slew Rate
f = 10MHz
88
dB
V/µs
V/µs
SR
A = 1
V
125
250
Output Slew Rate
A = 2
V
2
LT1253/LT1254
ELECTRICAL CHARACTERISTICS
0°C ≤ TA ≤ 70°C, VS = ±5V to ±12V, unless otherwise noted.
Symbol Parameter
CONDITIONS
MIN
TYP
3.5
5.8
3.5
MAX
UNITS
ns
t
Small-Signal Rise Time
Rise and Fall Time
Propagation Delay
V = ±12V, A = 2
r
S
V
V = ±5V, A = 2, V
S
= 1V
P-P
ns
V
OUT
t
V = ±5V, A = 2
S
ns
p
V
LT1253CN8: T = T + (P × 100°C/W)
Note 1: A heat sink may be required to keep the junction temperature
J
A
D
LT1253CS8: T = T + (P × 150°C/W)
below absolute maximum when the output is shorted indefinitely.
J
A
D
LT1254CN: T = T + (P × 70°C/W)
J
A
D
Note 2: T is calculated from the ambient temperature T and power
J
A
LT1254CS: T = T + (P × 100°C/W)
J
A
D
dissipation P according to the following formulas:
D
W U
TYPICAL AC PERFOR A CE
BANDWIDTH
Small Signal
–3dB BW (MHz)
Small Signal
–0.1dB BW (MHz)
Small Signal
Peaking (dB)
V
S
A
V
R
L
R
F
R
G
±12
±12
±12
±12
±12
±12
±12
±12
±12
±12
±5
1
1000
150
1100
1000
750
768
715
715
680
680
620
620
787
787
715
715
620
620
620
620
562
562
None
None
150
270
204
110
89
51
48
59
50
76
62
42
47
49
46
53
91
28
30
58
52
36
34
35
28
3.4
1.3
0.1
0.1
0.3
0
1
–1
–1
2
1000
150
768
1000
150
715
179
117
106
90
2
715
5
1000
150
180
0
5
180
0
10
10
1
1000
150
68.1
68.1
None
None
715
89
0.1
0.1
1.5
0.1
0.1
0.1
0.1
0.1
0
80
1000
150
218
158
76
±5
1
±5
–1
–1
2
1000
150
±5
715
70
±5
1000
150
620
117
92
±5
2
620
±5
5
1000
150
150
82
±5
5
150
72
0
±5
10
10
1000
150
61.9
61.9
70
0
±5
65
0
NTSC VIDEO (Note 1)
DIFFERENTIAL
GAIN
DIFFERENTIAL
PHASE
V
A
R
R
R
G
S
V
L
F
±12
±12
±5
2
1000
750
750
750
750
750
750
750
750
0.01%
0.01%
0.03%
0.03%
0.03°
0.12°
0.18°
0.28°
2
2
2
150
1000
150
±5
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°.
3
LT1253/LT1254
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Output Saturation Voltage
vs Temperature
Input Common-Mode Limit
vs Temperature
Supply Current vs Supply Voltage
+
+
V
V
10
9
–0.5
–1.0
–1.5
–2.0
–0.5
–1.0
8
–55°C
+
V
V
= 2V TO 12V
7
25°C
6
R
= ∞
L
±2V ≤ V ≤ ±12V
S
5
125°C
2.0
1.5
1.0
0.5
4
3
2
1
0
–
= –2V TO –12V
175°C
1.0
0.5
–
–
V
V
–50 –25
0
25
50
75 100 125
–50 –25
0
25
50
75 100 125
0
2
4
6
8
10 12 14 16 18
TEMPERATURE (°C)
TEMPERATURE (°C)
SUPPLY VOLTAGE (±V)
LT1253/54 • TPC02
LT1253/54 • TPC03
LT1253/54 • TPC01
Settling Time to 10mV
vs Output Step
2nd and 3rd Harmonic Distortion
vs Frequency
Power Supply Rejection
vs Frequency
80
60
10
8
–20
–30
V
V
= ±12V
S
O
L
F
V
S
L
= ±12V
= 100Ω
NONINVERTING
INVERTING
= 2V
P-P
R
R
R
A
= 100Ω
= 750Ω
= 10dB
6
R = R = 750Ω
F
G
4
2ND
V
POSITIVE
2
–40
–50
–60
–70
V
= ±12V
G
S
F
0
40
20
0
R
= R = 1k
3RD
–2
–4
NEGATIVE
–6
–8
NONINVERTING
20
INVERTING
60 80
–10
0
40
100
1
10
FREQUENCY (MHz)
100
10k
100k
1M
10M
100M
SETTLING TIME (ns)
FREQUENCY (Hz)
LT1253/54 • TPC04
LT1253/54 • TPC05
LT1253/54 • TPC06
Output Short-Circuit Current
vs Temperature
Spot Noise Voltage and Current
vs Frequency
Output Impedance
vs Frequency
100
10
1
100
10
70
60
50
40
30
V
= ±12V
S
–i
n
1.0
R = R = 2k
F
G
R = R = 750Ω
F
G
0.1
0.01
e
n
+i
n
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
10k
100k
1M
10M
100M
–50 –25
0
25 50 75 100 125 150 175
TEMPERATURE (°C)
FREQUENCY (Hz)
LT1253/54 • TPC07
LT1253/54 • TPC09
LT1253/54 • TPC08
4
LT1253/LT1254
U W
TYPICAL PERFOR A CE CHARACTERISTICS
±12V Frequency Response
±5V Frequency Response
5
4
3
2
5
4
3
2
0
0
–20
–40
–60
–20
–40
–60
PHASE
PHASE
1
0
–80
1
0
–80
GAIN
–100
–100
GAIN
–1
–2
–3
–4
–5
–120
–140
–160
–180
–200
–1
–2
–3
–4
–5
–120
–140
–160
–180
–200
V
A
R
R
= ±12V
= 1
= 150Ω
= 1k
V
A
R
R
= ±5V
= 1
= 150Ω
= 787Ω
S
V
L
F
S
V
L
F
1M
10M
100M
1G
1G
1G
1M
10M
100M
1G
FREQUENCY (Hz)
FREQUENCY (Hz)
LT1253/54 • TPC10
LT1253/54 • TPC11
±12V Frequency Response
±5V Frequency Response
12
11
10
9
12
11
10
9
0
0
–20
–40
–60
–20
–40
–60
PHASE
PHASE
8
7
–80
8
7
–80
–100
–100
6
5
4
3
2
–120
–140
–160
–180
–200
6
5
4
3
2
–120
–140
–160
–180
–200
V
A
R
R
R
= ±5V
= 2
= 150Ω
= 620Ω
= 620Ω
V
A
R
R
R
= ±12V
= 2
= 150Ω
= 715Ω
= 715Ω
S
V
L
F
S
V
L
F
GAIN
GAIN
G
G
1M
10M
100M
1G
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
LT1253/54 • TPC13
LT1253/54 • TPC12
±12V Frequency Response
±5V Frequency Response
26
25
24
23
26
25
24
23
0
0
–20
–40
–60
–20
–40
–60
PHASE
PHASE
22
21
–80
22
21
–80
–100
–100
20
19
18
17
16
–120
–140
–160
–180
–200
20
19
18
17
16
–120
–140
–160
–180
–200
V
A
R
R
R
= ±12V
= 10
= 150Ω
= 620Ω
= 68.1Ω
V
A
R
R
R
= ±5V
= 10
= 150Ω
= 562Ω
= 61.9Ω
S
V
L
F
S
V
GAIN
GAIN
L
F
G
G
1M
10M
100M
1M
10M
100M
1G
FREQUENCY (Hz)
FREQUENCY (Hz)
LT1253/54 • TPC14
LT1253/54 • TPC15
5
LT1253/LT1254
TYPICAL PERFOR A CE CHARACTERISTICS
U W
Transient Response
Transient Response
LT1253/54 • TPC17
LT1253/54 • TPC16
RF = 562Ω
G = 61.9Ω
VO = 1.5V
VS = ±5V
VS = ±5V
V = 1
L = 150Ω
RF = 787Ω
O = 1V
R
A
V
AV = 10
R
RL = 150Ω
U U
W
U
APPLICATIO S I FOR ATIO
Power Dissipation
PDMAX = 2 × VS × ISMAX + (VS – VOMAX) × VOMAX/RL
PDMAX = 2 × 12V × 7mA + (12V – 2V) × 2V/150
= 0.168 + 0.133 = 0.301 Watt per Amp
The LT1253/LT1254 amplifiers combine high speed and
large output current drive into very small packages. Be-
causetheseamplifiersworkoveraverywidesupplyrange,
itispossibletoexceedthemaximumjunctiontemperature
under certain conditions. To insure that the LT1253/
LT1254 are used properly, we must calculate the worst
case power dissipation, define the maximum ambient
temperature, select the appropriate package and then
calculate the maximum junction temperature.
Now if that is the dual LT1253, the total power in the
package is twice that, or 0.602W. We now must calculate
how much the die temperature will rise above the ambient.
The total power dissipation times the thermal resistance of
the package gives the amount of temperature rise. For the
above example, if we use the S8 surface mount package,
the thermal resistance is 150°C/W junction to ambient in
still air.
The worst case amplifier power dissipation is the total of
the quiescent current times the total power supply voltage
plus the power in the IC due to the load. The quiescent
supply current of the LT1253/LT1254 has a strong nega-
tive temperature coefficient. The supply current of each
amplifier at 150°C is less than 7mA and typically is only
4.5mA. The power in the IC due to the load is a function of
the output voltage, the supply voltage and load resistance.
The worst case occurs when the output voltage is at half
supply, if it can go that far, or its maximum value if it
cannot reach half supply.
Temperature Rise = PDMAX × RθJA = 0.602W
× 150°C/W = 90.3°C
The maximum junction temperature allowed in the plastic
package is 150°C. Therefore the maximum ambient al-
lowed is the maximum junction temperature less the
temperature rise.
Maximum Ambient = 150°C – 90.3°C = 59.7°C
Note that this is less than the maximum of 70°C that is
specified in the absolute maximum data listing. In order to
use this package at the maximum ambient we must lower
the supply voltage or reduce the output swing.
For example, let’s calculate the worst case power dissipa-
tion in a video cable driver operating on a±12V supply that
delivers a maximum of 2V into 150Ω.
6
LT1253/LT1254
U U
W
U
APPLICATIO S I FOR ATIO
As a guideline to help in the selection of the LT1253/
LT1254, the following table describes the maximum sup-
ply voltage that can be used with each part based on the
following assumptions:
MAX POWER
at MAX T
A
LT1253CN8
LT1253CS8
LT1254CN
LT1254CS
V < ±14 (Abs Max)
0.800W
0.533W
1.143W
0.727W
S
V < ±10.6
S
V < ±11.4
S
1. The maximum ambient is 70°C.
2. The load is a double-terminated video cable, 150Ω.
3. The maximum output voltage is 2V (peak or DC).
V < ±7.6
S
W
W
SI PLIFIED SCHE ATIC
One Amplifier
+
V
–IN
+IN
V
OUT
–
V
LT1253/54 • SS
U
Dimensions in inches (millimeters) unless otherwise noted.
PACKAGE DESCRIPTIO
N8 Package
8-Lead Plastic DIP
0.400
(10.160)
MAX
0.130 ± 0.005
0.300 – 0.320
0.045 – 0.065
(3.302 ± 0.127)
(1.143 – 1.651)
(7.620 – 8.128)
8
1
7
6
5
4
0.065
(1.651)
TYP
0.250 ± 0.010
(6.350 ± 0.254)
0.009 – 0.015
(0.229 – 0.381)
0.125
0.020
(0.508)
MIN
(3.175)
MIN
+0.025
–0.015
0.045 ± 0.015
(1.143 ± 0.381)
2
3
0.325
+0.635
8.255
(
)
–0.381
0.100 ± 0.010
(2.540 ± 0.254)
0.018 ± 0.003
(0.457 ± 0.076)
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 represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
7
LT1253/LT1254
U
Dimensions in inches (millimeters) unless otherwise noted.
PACKAGE DESCRIPTIO
N Package
14-Lead Plastic DIP
0.770
(19.558)
MAX
0.065
(1.651)
0.300 – 0.325
(7.620 – 8.255)
0.045 – 0.065
TYP
0.015
(0.380)
MIN
(1.143 – 1.651)
14
13
12
11
10
9
8
0.130 ± 0.005
(3.302 ± 0.127)
0.260 ± 0.010
(6.604 ± 0.254)
0.009 – 0.015
(0.229 – 0.381)
+0.025
1
2
3
5
6
7
4
0.325
–0.015
0.075 ± 0.015
(1.905 ± 0.381)
0.018 ± 0.003
(0.457 ± 0.076)
0.125
(3.175)
MIN
+0.635
8.255
(
)
–0.381
0.100 ± 0.010
(2.540 ± 0.254)
S8 Package
8-Lead SOIC
0.189 – 0.197
(4.801 – 5.004)
0.010 – 0.020
(0.254 – 0.508)
7
5
8
6
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0.228 – 0.244
0.150 – 0.157
(5.791 – 6.197)
(3.810 – 3.988)
0.016 – 0.050
0.406 – 1.270
0.050
(1.270)
BSC
0.014 – 0.019
(0.355 – 0.483)
0°– 8° TYP
1
2
3
4
S Package
14-Lead SOIC
0.337 – 0.344
(8.560 – 8.738)
0.010 – 0.020
(0.254 – 0.508)
14
13
12
11 10
9
8
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.008 – 0.010
(0.203 – 0.254)
0.004 – 0.010
(0.101 – 0.254)
0.228 – 0.244
0.150 – 0.157
(5.791 – 6.197)
(3.810 – 3.988)
0° – 8° TYP
0.050
(1.270)
TYP
0.016 – 0.050
0.406 – 1.270
0.014 – 0.019
(0.355 – 0.483)
1
2
3
4
5
6
7
LT/GP 0193 10K REV 0
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
8
●
●
LINEAR TECHNOLOGY CORPORATION 1993
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
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