1
LT1223
100MHz Current
Feedback Amplifier
D
U
ESCRIPTIO
S
FEATURE
s
100MHz Bandwidth at A
V
= 1
s
1000V/
s Slew Rate
s
Wide Supply Range:
5V to
15V
s
1mV Input Offset Voltage
s
1
A Input Bias Current
s
5M
Input Resistance
s
75ns Settling Time to 0.1%
s
50mA Output Current
s
6mA Quiescent Current
U
S
A
O
PPLICATI
s
Video Amplifiers
s
Buffers
s
IF and RF Amplification
s
Cable Drivers
s
8-, 10-, 12-Bit Data Acquisition Systems
The LT1223 is a 100MHz current feedback amplifier with
very good DC characteristics. The LT1223's high slew
rate, 1000V/
s, wide supply range,
15V, and large output
drive,
50mA, make it ideal for driving analog signals over
double- terminated cables. The current feedback amplifier
has high gain bandwidth at high gains, unlike conventional
op amps.
The LT1223 comes in the industry standard pinout and
can upgrade the performance of many older products.
The LT1223 is manufactured on Linear Technology's
proprietary complementary bipolar process.
Video Cable Driver
Voltage Gain vs Frequency
U
A
O
PPLICATI
TYPICAL
IN
V
OUT
V
R
G
1k
R
F
1k
75
75
CABLE
75
+
LT1223
LT1223 TA02
A = 1 +
V
R
F
R
G
AT AMPLIFIER OUTPUT.
6dB LESS AT V .
OUT
FREQUENCY (Hz)
100k
20
VOLTAGE GAIN (dB)
10
10
20
50
60
10M
100M
1G
LT1223 TPC01
1M
0
30
40
100MHz GAIN
BANDWIDTH
R
G
= 10
R
G
= 33
R
G
= 110
R
G
= 470
R
G
=
1k
R
G
+
2
LT1223
Supply Voltage ......................................................
18V
Differential Input Voltage .........................................
5V
Input Voltage ............................ Equal to Supply Voltage
Output Short Circuit Duration (Note 1) ......... Continuous
Operating Temperature Range
LT1223M ........................................ 55
C to 125
C
LT1223C ................................................ 0
C to 70
C
Storage Temperature Range ................. 65
C to 150
C
Junction Temperature Plastic Package ........... 150
C
Junction Temperature Ceramic Package ........ 175
C
Lead Temperature (Soldering, 10 sec.)................. 300
C
A
U
G
W
A
W
U
W
A
R
BSOLUTE
XI
TI
S
W
U
U
PACKAGE/ORDER I FOR ATIO
LT1223M/C
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
V
CM
= 0V
1
3
mV
I
IN
+
Noninverting Input Current
V
CM
= 0V
1
3
A
I
IN
Inverting Input Current
V
CM
= 0V
1
3
A
e
n
Input Noise Voltage Density
f = 1kHz, R
F
= 1k, R
G
= 10
3.3
nV/
Hz
i
n
Input Noise Current Density
f = 1kHz, R
F
= 1k, R
G
= 10
2.2
pA/
Hz
R
IN
Input Resistance
V
IN
=
10V
1
10
M
C
IN
Input Capacitance
1.5
pF
Input Voltage Range
10
12
V
CMRR
Common-Mode Rejection Ratio
V
CM
=
10V
56
63
dB
Inverting Input Current Common-Mode Rejection
V
CM
=
10V
30
100
nA/V
PSRR
Power Supply Rejection Ratio
V
S
=
4.5V to
18V
68
80
dB
Noninverting Input Current Power Supply Rejection
V
S
=
4.5V to
18V
12
100
nA/V
Inverting Input Current Power Supply Rejection
V
S
=
4.5V to
18V
60
500
nA/V
A
V
Large Signal Voltage Gain
R
LOAD
= 400
, V
OUT
=
10V
70
89
dB
R
OL
Transresistance,
V
OUT
/
I
IN
R
LOAD
= 400
, V
OUT
=
10V
1.5
5
M
V
OUT
Maximum Output Voltage Swing
R
LOAD
= 200
10
12
V
I
OUT
Maximum Output Current
R
LOAD
= 200
50
60
mA
SR
Slew Rate
R
F
= 1.5k, R
G
= 1.5k, (Note 2)
800
1300
V/
s
BW
Bandwidth
R
F
= 1k, R
G
= 1k, V
OUT
= 100mV
100
MHz
t
r
Rise Time
R
F
= 1.5k, R
G
= 1.5k, V
OUT
= 1V
6.0
ns
t
PD
Propagation Delay
R
F
= 1.5k, R
G
= 1.5k, V
OUT
= 1V
6.0
ns
Overshoot
R
F
= 1.5k, R
G
= 1.5k, V
OUT
= 1V
5
%
t
s
Settling Time, 0.1%
R
F
= 1k, R
G
= 1k, V
OUT
= 10V
75
ns
Differential Gain
R
F
= 1k, R
G
= 1k, R
L
= 150
0.02
%
Differential Phase
R
F
= 1k, R
G
= 1k, R
L
= 150
0.12
Deg
R
OUT
Open-Loop Output Resistance
V
OUT
= 0, I
OUT
= 0
35
I
S
Supply Current
V
IN
= 0V
6
10
mA
Supply Current, Shutdown
Pin 8 Current = 200
A
2
4
mA
ELECTRICAL C
C
HARA TERISTICS
V
S
=
15V, T
A
= 25
C, unless otherwise noted.
ORDER PART
NUMBER
S8 PART MARKING
LT1223MJ8
LT1223CJ8
LT1223CN8
LT1223CS8
1223
8
7
6
5
4
3
2
1
NULL
IN
+IN
V
NULL
OUT
+
V
SHUTDOWN
TOP VIEW
J8 PACKAGE
8-LEAD CERAMIC DIP
N8 PACKAGE
8-LEAD PLASTIC DIP
S8 PACKAGE
8-LEAD PLASTIC SOIC
LT1223 POI01
T
J MAX
= 175
C,
JA
= 100
C/W(J8)
T
J MAX
= 150
C,
JA
= 100
C/W(N8)
T
J MAX
= 150
C,
JA
= 150
C/W(S8)
3
LT1223
LT1223C
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
V
CM
= 0V
q
1
3
mV
I
IN
+
Noninverting Input Current
V
CM
= 0V
q
1
3
A
I
IN
Inverting Input Current
V
CM
= 0V
q
1
3
A
R
IN
Input Resistance
V
IN
=
10V
q
1
10
M
Input Voltage Range
q
10
12
V
CMRR
Common-Mode Rejection Ratio
V
CM
=
10V
q
56
63
dB
Inverting Input Current Common-Mode Rejection
V
CM
=
10V
q
30
100
nA/V
PSRR
Power Supply Rejection Ratio
V
S
=
4.5V to
18V
q
68
80
dB
Noninverting Input Current Power Supply Rejection
V
S
=
4.5V to
18V
q
12
100
nA/V
Inverting Input Current Power Supply Rejection
V
S
=
4.5V to
18V
q
60
500
nA/ V
A
V
Large-Signal Voltage Gain
R
LOAD
= 400
, V
OUT
=
10V
q
70
89
dB
R
OL
Transresistance,
V
OUT
/
I
IN
R
LOAD
= 400
, V
OUT
=
10V
q
1.5
5
M
V
OUT
Maximum Output Voltage Swing
R
LOAD
= 200
q
10
12
V
I
OUT
Maximum Output Current
R
LOAD
= 200
q
50
60
mA
I
S
Supply Current
V
IN
= 0V
q
6
10
mA
Supply Current, Shutdown
Pin 8 Current = 200
A
q
2
4
mA
ELECTRICAL C
C
HARA TERISTICS
V
S
=
15V, V
CM
= 0V, 0
C
T
A
70
C, unless otherwise noted.
ELECTRICAL C
C
HARA TERISTICS
V
S
=
15V, V
CM
= 0V, 55
C
T
A
125
C, unless otherwise noted.
LT1223M
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
V
CM
= 0V
q
1
5
mV
I
IN
+
Noninverting Input Current
V
CM
= 0V
q
1
5
A
I
IN
Inverting Input Current
V
CM
= 0V
q
1
10
A
R
IN
Input Resistance
V
IN
=
10V
q
1
10
M
Input Voltage Range
q
10
12
V
CMRR
Common-Mode Rejection Ratio
V
CM
=
10V
q
56
63
dB
Inverting Input Current Common-Mode Rejection
V
CM
=
10V
q
30
100
nA/V
PSRR
Power Supply Rejection Ratio
V
S
=
4.5V to
15V
q
68
80
dB
Noninverting Input Current Power Supply Rejection
V
S
=
4.5V to
15V
q
12
200
nA/V
Inverting Input Current Power Supply Rejection
V
S
=
4.5V to
15V
q
60
500
nA/V
A
V
Large-Signal Voltage Gain
R
LOAD
= 400
, V
OUT
=
10V
q
70
89
dB
R
OL
Transresistance,
V
OUT
/
I
IN
R
LOAD
= 400
, V
OUT
=
10V
q
1.5
5
M
V
OUT
Maximum Output Voltage Swing
R
LOAD
= 200
q
7
12
V
I
OUT
Maximum Output Current
R
LOAD
= 200
q
35
60
mA
I
S
Supply Current
V
IN
= 0V
q
6
10
mA
Supply Current, Shutdown
Pin 8 Current = 200
A
q
2
4
mA
The
q
denotes the specifications which apply over the full operating
temperature range.
Note 1: A heat sink may be required.
Note 2: Noninverting operation, V
OUT
=
10V, measured at
5V.
4
LT1223
C
C
HARA TERISTICS
U
W
A
TYPICAL PERFOR
CE
Supply Current vs Supply Voltage,
Supply Current vs Supply Voltage
Output Short Circuit-Current vs
V
IN
= 0 (Operating)
(Shutdown)
Temperature
COMMON MODE VOLTAGE (V)
15
10
l ( A)
6
2
2
6
10
LT1223 TPC07
10
5
0
5
10
15
125C
8
4
0
4
8
55C
V = 15V
S
25C
B
COMMON MODE VOLTAGE (V)
15
5
+l ( A)
3
1
1
3
5
LT1223 TPC06
10
5
0
5
10
15
25C
125C
4
2
0
2
4
55C
B
V = 15V
S
TEMPERATURE (C)
COMMON MODE RANGE (V)
+2
LT1223 TPC05
+1
+3
+4
4
3
2
1
V = 15V
S
V = 5V
S
V = 15V
S
V = 5V
S
50
25
0
25
50
75
100
125
V+
V
SUPPLY VOLTAGE ( V)
0
0
SUPPLY CURRENT (mA)
2
4
6
8
10
LT1223 TPC02
2
4
6
8
10 12 14 16 18 20
55C
25C
125C
SUPPLY VOLTAGE ( V)
0
0
SUPPLY CURRENT (mA)
1
2
3
4
LT1223 TPC03
2
4
6
8
10 12 14 16 18 20
125C
55C
PIN 8 = 0V
25C
CASE TEMPERATURE (C)
50
0
OUTPUT SHORT CIRCUIT CURRENT (mA)
30
100
LT1223 TPC04
25
0
25
50
75
100
125
10
20
40
50
60
70
80
90
Input Common-Mode Limit vs
Temperature
+I
B
vs Common-Mode Voltage
I
B
vs Common-Mode Voltage
Output Voltage Swing vs
Output Voltage Swing vs
V
OS
vs Common-Mode Voltage
Load Resistor
Supply Voltage
COMMON MODE VOLTAGE (V)
15
20
V (mV)
10
10
20
LT1223 TPC08
10
5
0
5
10
15
15
5
0
5
15
55C
25C
125C
OS
V = 15V
S
LOAD RESISTOR ( )
100
20
OUTPUT VOLTAGE SWING (V)
15
20
1000
10000
LT1223 TPC09
15
10
5
0
5
10
125C
V = 15V
S
25C, 55C
125C
25C, 55C
SUPPLY VOLTAGE ( V)
0
20
OUTPUT VOLTAGE SWING (V)
10
5
10
20
LT1223 TPC10
2
4
6
8
10 12 14 16 18 20
125C
15
0
5
15
25C
25C
125C
55C
55C
5
LT1223
3dB Bandwidth vs
3dB Bandwidth vs
Minimum Feedback Resistor vs
Feedback Resistor
Supply Voltage
Voltage Gain
C
C
HARA TERISTICS
U
W
A
TYPICAL PERFOR
CE
FEEDBACK RESISTOR (k )
0
0
3dB BANDWIDTH (MHz)
30
100
LT1223 TPC11
1
2
3
10
20
40
50
60
70
80
90
L
S
A = 2; R
F
= R
G
R = 100 ; V = 15V
NO CAPACITIVE LOAD
V
SUPPLY VOLTAGE ( V)
0
0
3dB BANDWIDTH (MHz)
30
100
LT1223 TPC12
5
10
15
10
20
40
50
60
70
80
90
R
F
= 750
R
F
= 1k
R
F
= 1.5k
R
F
= 2k
R
F
= R
G
A = 2
R = 100
T = 25C
V
A
L
VOLTAGE GAIN (V/V)
0
100
FEEDBACK RESISTOR ( )
400
1000
LT1223 TPC13
20
40
60
200
300
500
600
700
800
900
10
30
50
2dB PEAKING
0dB PEAKING
V = 15V
R = 100
S
L
Maximum Capacitive Load vs
Open-Loop Voltage Gain vs
Feedback Resistor
Load Resistor
Transimpedance vs Load Resistor
LOAD RESISTOR ( )
100
40
OPEN LOOP VOLTAGE GAIN (dB)
100
1000
10000
LT1223 TPC15
50
60
70
80
90
55C
25C
V = 15V
V = 10V
S
125C
O
Spot Noise Voltage and Current vs
Power Supply Rejection vs
Frequency
Frequency
Output Impedance vs Frequency
FREQUENCY (Hz)
10
1
SPOT NOISE (nV/ OR pA/ )
10
100
1000
100
1k
10k
LT1223 TPC17
en
+in
in
Hz
Hz
FEEDBACK RESISTOR (k )
0
10
CAPACITIVE LOAD (pF)
100
1k
10k
1
2
3
LT1223 TPC14
L
S
A = 2; R
F
= R
G
R = 100; V = 15V
PEAKING < 5dB
V
LOAD RESISTOR ( )
100
0
TRANSIMPEDANCE (M )
10
1000
10000
LT1223 TPC16
1
2
3
5
4
6
7
8
9
V = 15V
V = 10V
S
O
55C
25C
125C
FREQUENCY (Hz)
20
POWER SUPPLY REJECTION (dB)
40
60
80
10k
1M
10M
100M
LT1223 TPC18
0
100k
NEGATIVE
POSITIVE
V = 15V
R
F
= 1k
S
FREQUENCY (Hz)
0.1
MAGNITUDE OF OUTPUT IMPEDANCE ( )
1
10
100
10k
1M
10M
100M
LT1223 TPC19
0.01
100k
R
F
= R
G
= 3k
V = 15V
S
R
F
= R
G
= 1k
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