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Электронный компонент: LT1227CN8

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1
LT1227
140MHz Video Current
Feedback Amplifier
U
A
O
PPLICATI
TYPICAL
S
FEATURE
s
140MHz Bandwidth: A
V
= 2, R
L
= 150
s
1100V/
s Slew Rate
s
Low Cost
s
30mA Output Drive Current
s
0.01% Differential Gain
s
0.01
Differential Phase
s
High Input Impedance: 14M
, 3pF
s
Wide Supply Range:
2V to
15V
s
Shutdown Mode: I
S
< 250
A
s
Low Supply Current: I
S
= 10mA
s
Inputs Common Mode to Within 1.5V of Supplies
s
Outputs Swing Within 0.8V of Supplies
The LT1227 is a current feedback amplifier with wide
bandwidth and excellent video characteristics. The low
differential gain and phase, wide bandwidth, and 30mA
output drive current make the LT1227 well suited to drive
cables in video systems.
A shutdown feature switches the device into a high imped-
ance, low current mode, allowing multiple devices to be
connected in parallel and selected. Input to output isola-
tion in shutdown is 70dB at 10MHz for input amplitudes up
to 10V
P-P
. The shutdown pin interfaces to open collector
or open drain logic and takes only 4
s to enable or disable.
The LT1227 comes in the industry standard pinout and
can upgrade the performance of many older products. For
a dual or quad version, see the LT1229/1230 data sheet.
The LT1227 is manufactured on Linear Technology's
proprietary complementary bipolar process.
D
U
ESCRIPTIO
Video Cable Driver
Differential Gain and Phase
vs Supply Voltage
+
75
CABLE
V
OUT
75
R
G
1k
LT1227
75
V
IN
V
OUT
V
IN
= 1
1227 TA01
R
F
1k
s
Video Amplifiers
s
Cable Drivers
s
RGB Amplifiers
s
Test Equipment Amplifiers
s
50
Buffers for Driving Mixers
U
S
A
O
PPLICATI
SUPPLY VOLTAGE (V)
5
DIFFERENTIAL PHASE (DEG)
0.12
0.16
0.20
13
LT1227 TA02
0.08
0.04
0
7
9
11
15
0.12
0.16
0.20
0.08
0.04
0
DIFFERENTIAL GAIN (%)
NTSC COMPOSITE
f = 3.58MHz
G
2
LT1227
1
2
3
4
5
6
7
8
TOP VIEW
S8 PACKAGE
8-LEAD PLASTIC SO
NULL
IN
+IN
V
SHUTDOWN
V
+
OUT
NULL
A
U
G
W
A
W
U
W
A
R
BSOLUTE
XI
TI
S
W
U
U
PACKAGE/ORDER I FOR ATIO
Supply Voltage .....................................................
18V
Input Current ......................................................
15mA
Output Short Circuit Duration (Note 1) ........ Continuous
Operating Temperature Range
LT1227C .................................................. 0
C to 70
C
LT1227M ......................................... 55
C to 125
C
Storage Temperature Range ................. 65
C to 150
C
Junction Temperature
Plastic Package ................................................ 150
C
Ceramic Package ............................................. 175
C
Lead Temperature (Soldering, 10 sec.)................ 300
C
1
2
3
4
5
6
7
8
TOP VIEW
NULL
IN
+IN
V
SHUTDOWN
V
+
OUT
NULL
J8 PACKAGE
8-LEAD CERAMIC DIP
N8 PACKAGE
8-LEAD PLASTIC DIP
T
JMAX
= 175
C,
JA
=
100
C/W
(J)
T
JMAX
=
150
C,
JA
=
100
C/W (N)
T
JMAX
=
150
C,
JA
=
150
C/W
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
T
A
= 25
C
3
10
mV
q
15
mV
Input Offset Voltage Drift
q
10
V/
C
I
IN+
Noninverting Input Current
T
A
= 25
C
0.3
3
A
q
10
A
I
IN
Inverting Input Current
T
A
= 25
C
10
60
A
q
100
A
e
n
Input Noise Voltage Density
f = 1kHz, R
F
= 1k, R
G
= 10
, R
S
= 0
3.2
nV/
Hz
+i
n
Noninverting Input Noise Current Density
f = 1kHz
1.7
pA/
Hz
i
n
Inverting Input Noise Current Density
f = 1kHz
32
pA/
Hz
R
IN
Input Resistance
V
IN
=
13V, V
S
=
15V
q
1.5
14
M
V
IN
=
3V, V
S
=
5V
q
1.5
11
M
C
IN
Input Capacitance
3
pF
Input Voltage Range
V
S
=
15V, T
A
= 25
C
13
13.5
V
q
12
V
V
S
=
5V, T
A
= 25
C
3
3.5
V
q
2
V
CMRR
Common-Mode Rejection Ratio
V
S
=
15V, V
CM
=
13V, T
A
= 25
C
55
62
dB
V
S
=
15V, V
CM
=
12V
q
55
dB
V
S
=
5V, V
CM
=
3V, T
A
= 25
C
55
61
dB
V
S
=
5V, V
CM
=
2V
q
55
dB
Inverting Input Current
V
S
=
15V, V
CM
=
13V, T
A
= 25
C
3.5
10
A/V
Common-Mode Rejection
V
S
=
15V, V
CM
=
12V
q
10
A/V
V
S
=
5V, V
CM
=
3V, T
A
= 25
C
4.5
10
A/V
V
S
=
5V, V
CM
=
2V
q
10
A/V
ELECTRICAL C
C
HARA TERISTICS
V
CM
= 0,
5V
V
S
15V, pulse tested, unless otherwise noted.
Consult factory for Industrial grade parts.
S8 PART MARKING
ORDER PART
NUMBER
LT1227CS8
LT1227MJ8
LT1227CN8
1227
3
LT1227
ELECTRICAL C
C
HARA TERISTICS
V
CM
= 0,
5V
V
S
15V, pulse tested, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
PSRR
Power Supply Rejection Ratio
V
S
=
2V to
15V, T
A
= 25
C
60
80
dB
V
S
=
3V to
15V
q
60
dB
Noninverting Input Current
V
S
=
2V to
15V, T
A
= 25
C
2
50
nA/V
Power Supply Rejection
V
S
=
3V to
15V
q
50
nA/V
Inverting Input Current
V
S
=
2V to
15V, T
A
= 25
C
0.25
5
A/V
Power Supply Rejection
V
S
=
3V to
15V
q
5
A/V
A
V
Large-Signal Voltage Gain
V
S
=
15V, V
OUT
=
10V, R
L
= 1k
q
55
72
dB
V
S
=
5V, V
OUT
=
2V, R
L
= 150
q
55
72
dB
R
OL
Transresistance,
V
OUT
/
I
IN
V
S
=
15V, V
OUT
=
10V, R
L
= 1k
q
100
270
k
V
S
=
5V, V
OUT
=
2V, R
L
= 150
q
100
240
k
V
OUT
Maximum Output Voltage Swing
V
S
=
15V, R
L
= 400
, T
A
= 25
C
12
13.5
V
q
10
V
V
S
=
5V, R
L
= 150
, T
A
= 25
C
3
3.7
V
q
2.5
V
I
OUT
Maximum Output Current
R
L
= 0
, T
A
= 25
C
30
60
mA
I
S
Supply Current (Note 2)
V
S
=
15V, V
OUT
= 0V, T
A
= 25
C
10
15.0
mA
q
17.5
mA
Positive Supply Current, Shutdown
V
S
=
15V, Pin 8 Voltage = 0V, T
A
= 25
C
120
300
A
q
500
A
I
8
Shutdown Pin Current (Note 3)
V
S
=
15V
q
300
A
Output Leakage Current, Shutdown
V
S
=
15V, Pin 8 Voltage = 0V, T
A
= 25
C
10
A
SR
Slew Rate (Notes 4 and 5)
T
A
= 25
C
500
1100
V/
s
t
r
, t
f
Rise and Fall Time, V
OUT
= 1V
P-P
V
S
=
5V, R
F
= 1k, R
G
= 1k, R
L
= 150
8.7
ns
BW
Small-Signal Bandwidth
V
S
=
15V, R
F
= 1k, R
G
= 1k, R
L
= 150
140
MHz
t
r
, t
f
Small-Signal Rise and Fall Time
V
S
=
15V, R
F
= 1k, R
G
= 1k, R
L
= 100
3.3
ns
Propagation Delay
V
S
=
15V, R
F
= 1k, R
G
= 1k, R
L
= 100
3.4
ns
Small-Signal Overshoot
V
S
=
15V, R
F
= 1k, R
G
= 1k, R
L
= 100
5
%
t
S
Settling Time
0.1%, V
OUT
= 10V, R
F
= 1k, R
G
= 1k, R
L
= 1k
50
ns
Differential Gain (Note 6)
V
S
=
15V, R
F
= 1k, R
G
= 1k, R
L
= 150
0.014
%
V
S
=
15V, R
F
= 1k, R
G
= 1k, R
L
= 1k
0.010
%
Differential Phase (Note 6)
V
S
=
15V, R
F
= 1k, R
G
= 1k, R
L
= 150
0.010
DEG
V
S
=
15V, R
F
= 1k, R
G
= 1k, R
L
= 1k
0.013
DEG
The
q
denotes specifications which apply over the operating temperature
range.
Note 1: A heat sink may be required depending on the power supply
voltage.
Note 2: The supply current of the LT1227 has a negative temperature
coefficient. For more information, see Typical Performance Characteristics
curves.
Note 3: Ramp pin 8 voltage down from 15V while measuring I
S
. When I
S
drops to less than 0.5mA, measure pin 8 current.
Note 4: Slew rate is measured at
5V on a
10V output signal while
operating on
15V supplies with R
F
= 2k, R
G
= 220
and R
L
= 400
.
Note 5: AC parameters are 100% tested on the ceramic and plastic DIP
package parts (J and N suffix) and are sample tested on every lot of the SO
packaged parts (S suffix).
Note 6: NTSC composite video with an output level of 2V.
4
LT1227
Voltage Gain and Phase vs
Frequency, Gain = 6dB
C
C
HARA TERISTICS
U
W
A
TYPICAL PERFOR
CE
Voltage Gain and Phase vs
Frequency, Gain = 20dB
Voltage Gain and Phase vs
Frequency, Gain = 40dB
3dB Bandwidth vs Supply
Voltage, Gain = 100, R
L
= 100
3dB Bandwidth vs Supply
Voltage, Gain = 100, R
L
= 1k
SUPPLY VOLTAGE (V)
0
0
3dB BANDWIDTH (MHz)
20
60
80
100
140
4
8
10
18
LT1227 TPC06
40
160
180
120
2
6
12
14
16
PEAKING
0.5dB
PEAKING
5dB
R
F
= 500
R
F
= 750
R
F
= 2k
R
F
= 1k
3dB Bandwidth vs Supply
Voltage, Gain = 10, R
L
= 1k
SUPPLY VOLTAGE (V)
0
0
3dB BANDWIDTH (MHz)
20
60
80
100
140
4
8
10
18
LT1227 TPC05
40
160
180
120
2
6
12
14
16
PEAKING
0.5dB
PEAKING
5dB
R
F
= 500
R
F
= 750
R
F
= 2k
R
F
= 1k
R
F
= 250
3dB Bandwidth vs Supply
Voltage, Gain = 10, R
L
= 100
3dB Bandwidth vs Supply
Voltage, Gain = 2, R
L
= 1k
3dB Bandwidth vs Supply
Voltage, Gain = 2, R
L
= 100
SUPPLY VOLTAGE (V)
0
0
3dB BANDWIDTH (MHz)
20
60
80
100
140
4
8
10
18
LT1227 TPC02
40
160
180
120
2
6
12
14
16
PEAKING
0.5dB
PEAKING
5dB
R
F
= 500
R
F
= 750
R
F
= 2k
R
F
= 1k
SUPPLY VOLTAGE (V)
0
0
3dB BANDWIDTH (MHz)
20
60
80
100
140
4
8
10
18
LT1227 TPC03
40
160
180
120
2
6
12
14
16
R
F
= 750
PEAKING
0.5dB
PEAKING
5dB
R
F
= 1k
R
F
= 1.5k
R
F
= 2k
SUPPLY VOLTAGE (V)
0
0
3dB BANDWIDTH (MHz)
2
6
8
10
14
4
8
10
18
LT1227 TPC08
4
16
18
12
2
6
12
14
16
R
F
= 500
R
F
= 2k
R
F
= 1k
SUPPLY VOLTAGE (V)
0
0
3dB BANDWIDTH (MHz)
2
6
8
10
14
4
8
10
18
LT1227 TPC09
4
16
18
12
2
6
12
14
16
R
F
= 500
R
F
= 2k
R
F
= 1k
FREQUENCY (MHz)
0.1
4
VOLTAGE GAIN (dB)
5
6
7
8
1
10
100
LT1227 TPC01
3
2
1
0
9
10
225
180
135
90
45
0
PHASE SHIFT (DEG)
PHASE
GAIN
V
S
= 15V
R
L
= 100
R
F
= 910
FREQUENCY (MHz)
0.1
18
VOLTAGE GAIN (dB)
19
20
21
22
1
10
100
LT1227 TPC04
17
16
15
14
23
24
225
180
135
90
45
0
PHASE SHIFT (DEG)
PHASE
GAIN
V
S
= 15V
R
L
= 100
R
F
= 825
FREQUENCY (MHz)
0.1
38
VOLTAGE GAIN (dB)
39
40
41
42
1
10
100
LT1227 TPC07
37
36
35
34
43
44
225
180
135
90
45
0
PHASE SHIFT (DEG)
PHASE
GAIN
V
S
= 15V
R
L
= 100
R
F
= 500
5
LT1227
C
C
HARA TERISTICS
U
W
A
TYPICAL PERFOR
CE
Maximum Capacitive Load
vs Feedback Resistor
Total Harmonic Distortion
vs Frequency
Maximum Undistorted Output
vs Frequency
Output Short-Circuit Current
vs Junction Temperature
TEMPERATURE (C)
50
30
OUTPUT SHORT-CIRCUIT CURRENT (mA)
50
0
50
100
LT1227 TPC15
40
25
25
60
70
75
150 175
125
Output Saturation Voltage
vs Temperature
Input Common Mode Limit
vs Temperature
Spot Noise Voltage and Current
vs Frequency
FREQUENCY (Hz)
POWER SUPPLY REJECTION (dB)
20
40
60
80
10k
1M
10M
100M
LT1227 TPC17
0
100k
V
S
= 15V
R
L
= 100
R
F
= R
G
= 1k
NEGATIVE
POSITIVE
Power Supply Rejection
vs Frequency
FREQUENCY (Hz)
0.1
OUTPUT IMPEDANCE (
)
10k
1M
10M
100M
LT1227 TPC18
0.001
100k
100
10
1
0.01
V
S
= 15V
R
F
= R
G
= 2k
R
F
= R
G
= 1k
Output Impedance vs Frequency
TEMPERATURE (C)
50
V
COMMON MODE RANGE (V)
0.5
1.5
2.0
V
+
1.5
0
50
75
LT1227 TPC13
1.0
1.0
0.5
2.0
25
25
100
125
V
+
= 2V TO 18V
V
= 2V TO 18V
TEMPERATURE (C)
50
1.0
V
+
25
75
LT
1227 TPC14
1.0
25
0
50
100
125
0.5
V
0.5
OUTPUT SATURATION VOLTAGE (V)
R
L
=
2V
V
S
18V
FEEDBACK RESISTOR (k
)
10
CAPACITIVE LOAD (pF)
100
1000
10000
0
1
3
1
LT1227 TPC10
2
V
S
= 5V
V
S
= 15V
R
L
= 1k
PEAKING
5dB
GAIN = 2
FREQUENCY (MHz)
1
0
OUTPUT VOLTAGE (V
P-P
)
5
10
15
20
25
10
100
LT1127 TPC12
V
S
= 15V
R
L
= 1k
R
F
= 1k
A
V
= +10
A
V
= 1
A
V
= +1
A
V
= +2
FREQUENCY (Hz)
10
0.001
TOTAL HARMONIC DISTORTION (%)
0.01
0.1
1k
100k
LT1227 TPC11
100
10k
V
O
= 7V
RMS
V
O
= 1V
RMS
V
S
= 15V
R
L
= 400
R
F
= R
G
= 1k
FREQUENCY (Hz)
10
1
10
100
1k
100k
LT1227 TPC16
100
10k
SPOT NOISE (nV/
Hz OR pA/
Hz)
i
n
e
n
+i
n