1
LT1224
Very High Speed
Operational Amplifier
s
Unity-Gain Stable
s
45MHz Gain-Bandwidth
s
400V/
s Slew Rate
s
7V/mV DC Gain: R
L
= 500
s
Maximum Input Offset Voltage: 2mV
s
12V Minimum Output Swing into 500
s
Wide Supply Range:
2.5V to
15V
s
7mA Supply Current
s
90ns Settling Time to 0.1%, 10V Step
s
Drives All Capacitive Loads
D
U
ESCRIPTIO
S
FEATURE
The LT1224 is a very high speed operational amplifier with
excellent DC performance. The LT1224 features reduced
input offset voltage and higher DC gain than devices with
comparable bandwidth and slew rate. The circuit is a
single gain stage with outstanding settling characteristics.
The fast settling time makes the circuit an ideal choice for
data acquisition systems. The output is capable of driving
a 500
load to
12V with
15V supplies and a 150
load
to
3V on
5V supplies. The circuit is also capable of
driving large capacitive loads which makes it useful in
buffer or cable driver applications.
The LT1224 is a member of a family of fast, high per-
formance amplifiers that employ Linear Technology
Corporation's advanced bipolar complementary
processing.
U
S
A
O
PPLICATI
s
Wideband Amplifiers
s
Buffers
s
Active Filters
s
Video and RF Amplification
s
Cable Drivers
s
Data Acquisition Systems
U
A
O
PPLICATI
TYPICAL
DAC Current-to-Voltage Converter
Inverter Pulse Response
LT1224 TA01
+
DAC-08
TYPE
0.1
F
5k
1 LSB SETTLING = 140ns
V
OUT
5k
7pF
LT1224
LT1224 TA02
LT1224
2
Total Supply Voltage (V
+
to V
) ............................... 36V
Differential Input Voltage .........................................
6V
Input Voltage ............................................................
V
S
Output Short Circuit Duration (Note 1) ............ Indefinite
Operating Temperature Range
LT1224C ................................................ 0
C to 70
C
Maximum Junction Temperature
Plastic Package .............................................. 150
C
Storage Temperature Range ................. 65
C to 150
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
ORDER PART
NUMBER
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
(Note 2)
0.5
2.0
mV
I
OS
Input Offset Current
100
400
nA
I
B
Input Bias Current
4
8
A
e
n
Input Noise Voltage
f = 10kHz
22
nV/
Hz
i
n
Input Noise Current
f = 10kHz
1.5
pA/
Hz
R
IN
Input Resistance
V
CM
=
12V
24
40
M
Differential
250
k
C
IN
Input Capacitance
2
pF
Input Voltage Range
+
12
14
V
Input Voltage Range
13
12
V
CMRR
Common-Mode Rejection Ratio
V
CM
=
12V
86
100
dB
PSRR
Power Supply Rejection Ratio
V
S
=
5V to
15V
75
84
dB
A
VOL
Large-Signal Voltage Gain
V
OUT
=
10V, R
L
= 500
3.3
7
V/mV
V
OUT
Output Swing
R
L
= 500
12.0
13.3
V
I
OUT
Output Current
V
OUT
=
12V
24
40
mA
SR
Slew Rate
A
VCL
= 2, (Note 3)
250
400
V/
s
Full Power Bandwidth
10V Peak, (Note 4)
6.4
MHz
GBW
Gain-Bandwidth
f = 1MHz
45
MHz
t
r
, t
f
Rise Time, Fall Time
A
VCL
= 1, 10% to 90%, 0.1V
5
ns
Overshoot
A
VCL
= 1, 0.1V
30
%
Propagation Delay
50% V
IN
to 50% V
OUT
5
ns
t
s
Settling Time
10V Step, 0.1%
90
ns
Differential Gain
f = 3.58MHz, R
L
= 150
1
%
Differential Phase
f = 3.58MHz, R
L
= 150
2.4
Deg
R
O
Output Resistance
A
VCL
= 1, f = 1MHz
2.5
I
S
Supply Current
7
9
mA
ELECTRICAL C
C
HARA TERISTICS
V
S
=
15V, T
A
= 25
C, R
L
= 1k, V
CM
= 0V unless otherwise noted.
LT1224CN8
LT1224CS8
S8 PART MARKING
1224
8
7
6
5
4
3
2
1
NULL
IN
+IN
V
NC
OUT
+
V
NULL
TOP VIEW
S8 PACKAGE
8-LEAD PLASTIC SOIC
N8 PACKAGE
8-LEAD PLASTIC DIP
LT1224 POI01
T
JMAX
= 150
C,
JA
= 100
C/W (N8)
T
JMAX
= 150
C,
JA
= 150
C/W (S8)
3
LT1224
V
S
=
5V, T
A
= 25
C, R
L
= 1k, V
CM
= 0V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
V
S
=
15V, (Note 2)
1
4
mV
V
S
=
5V, (Note 2)
2
5
mV
Input V
OS
Drift
25
V/
C
I
OS
Input Offset Current
V
S
=
15V and V
S
=
5V
100
600
nA
I
B
Input Bias Current
V
S
=
15V and V
S
=
5V
4
9
A
CMRR
Common-Mode Rejection Ratio
V
S
=
15V, V
CM
=
12V and V
S
=
5V, V
CM
=
2.5V
83
98
dB
PSRR
Power Supply Rejection Ratio
V
S
=
5V to
15V
73
84
dB
A
VOL
Large-Signal Voltage Gain
V
S
=
15V, V
OUT
=
10V, R
L
= 500
2.5
7
V/mV
V
S
=
5V, V
OUT
=
2.5V, R
L
= 500
2.0
7
V/mV
V
OUT
Output Swing
V
S
=
15V, R
L
= 500
12.0
13.3
V
V
S
=
5V, R
L
= 500
or 150
3.0
3.3
V
I
OUT
Output Current
V
S
=
15V, V
OUT
=
12V
24
40
mA
V
S
=
5V, V
OUT
=
3V
20
40
mA
SR
Slew Rate
V
S
=
15V, A
VCL
= 2, (Note 3)
250
400
V/
s
I
S
Supply Current
V
S
=
15V and V
S
=
5V
7
10.5
mA
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
(Note 2)
1
4
mV
I
OS
Input Offset Current
100
400
nA
I
B
Input Bias Current
4
8
A
Input Voltage Range
+
2.5
4
V
Input Voltage Range
3
2.5
V
CMRR
Common-Mode Rejection Ratio
V
CM
=
2.5V
86
98
dB
A
VOL
Large-Signal Voltage Gain
V
OUT
=
2.5V, R
L
= 500
2.5
7
V/mV
V
OUT
=
2.5V, R
L
= 150
3
V/mV
V
OUT
Output Swing
R
L
= 500
3.0
3.7
V
R
L
= 150
3.0
3.3
V
I
OUT
Output Current
V
OUT
=
3V
20
40
mA
SR
Slew Rate
A
VCL
= 2, (Note 3)
250
V/
s
Full Power Bandwidth
3V Peak, (Note 4)
13.3
MHz
GBW
Gain-Bandwidth
f = 1MHz
34
MHz
t
r
, t
f
Rise Time, Fall Time
A
VCL
= 1, 10% to 90%, 0.1V
7
ns
Overshoot
A
VCL
= 1, 0.1V
20
%
Propagation Delay
50% V
IN
to 50% V
OUT
7
ns
t
s
Settling Time
2.5V to 2.5V, 0.1%
90
ns
I
S
Supply Current
7
9
mA
ELECTRICAL C
C
HARA TERISTICS
ELECTRICAL C
C
HARA TERISTICS
0
C
T
A
70
C, R
L
= 1k, V
CM
= 0V unless otherwise noted.
Note 1: A heat sink may be required to keep the junction temperature
below absolute maximum when the output is shorted indefinitely.
Note 2: Input offset voltage is tested with automated test equipment
in <1 second.
Note 3: Slew rate is measured in a gain of 2 between
10V on the output
with
6V on the input for
15V supplies and
2V on the output with
1.75V on the input for
5V supplies.
Note 4: Full power bandwidth is calculated from the slew rate
measurement: FPBW = SR/2
Vp.
LT1224
4
C
C
HARA TERISTICS
U
W
A
TYPICAL PERFOR
CE
Output Short Circuit Current vs
Supply Current vs Temperature
Input Bias Current vs Temperature
Temperature
Output Voltage Swing vs
Input Bias Current vs Input
Open-Loop Gain vs
Resistive Load
Common-Mode Voltage
Resistive Load
Input Common-Mode Range vs
Output Voltage Swing vs
Supply Voltage
Supply Current vs Supply Voltage
Supply Voltage
TEMPERATURE (C)
50
25
OUTPUT SHORT-CIRCUIT CURRENT (mA)
35
40
50
55
25
25
75
125
LT1224 TPC09
100
50
0
30
45
V
S
= 5V
SINK
SOURCE
TEMPERATURE (C)
50
3.5
INPUT BIAS CURRENT (
A)
4.0
4.25
4.75
50
25
25
75
125
LT1224 TPC08
100
50
0
3.75
4.5
V
S
= 15V
I
B
+
+ I
B
2
I
B
=
TEMPERATURE (C)
50
4
SUPPLY CURRENT (mA)
6
7
9
10
25
25
75
125
LT1224 TPC07
V
S
= 15V
100
50
0
5
8
LOAD RESISTANCE (
)
10
0
OUTPUT VOLTAGE SWING (Vp-p)
10
20
25
30
100
1k
10k
LT1224 TPC04
15
5
T
A
= 25C
V
OS
= 30mV
V
S
= 15V
V
S
= 5V
INPUT COMMON-MODE VOLTAGE (V)
15
3.0
INPUT BIAS CURRENT (
A)
3.5
4.0
4.5
5.0
10
0
10
15
LT1224 TPC05
5
5
V
S
= 15V
T
A
= 25C
I
B
+
+ I
B
2
I
B
=
LOAD RESISTANCE (
)
10
50
OPEN-LOOP GAIN (dB)
80
90
100
100
1k
10k
LT1224 TPC06
70
60
T
A
= 25C
V
S
= 15V
V
S
= 5V
SUPPLY VOLTAGE (V)
0
0
OUTPUT VOLTAGE SWING (V)
5
10
15
20
5
10
15
20
LT1224 TPC03
T
A
= 25C
R
L
= 500
V
OS
= 30mV
+V
SW
V
SW
SUPPLY VOLTAGE (V)
0
6.0
SUPPLY CURRENT (mA) 6.5
7.0
7.5
8.0
5
10
15
20
LT1224 TPC02
T
A
= 25C
SUPPLY VOLTAGE (V)
0
0
MAGNITUDE OF INPUT VOLTAGE (V)
5
10
15
20
5
10
15
20
LT1224 TPC01
T
A
= 25C
V
OS
< 1mV
+V
CM
V
CM
5
LT1224
C
C
HARA TERISTICS
U
W
A
TYPICAL PERFOR
CE
Closed-Loop Output Impedance vs
Frequency
Gain-Bandwidth vs Temperature
Slew Rate vs Temperature
Voltage Gain and Phase vs
Frequency Response vs
Frequency
Output Swing vs Settling Time
Capacitive Load
Power Supply Rejection Ratio vs
Common Mode Rejection Ratio vs
Input Noise Spectral Density
Frequency
Frequency
TEMPERATURE (C)
50
200
SLEW RATE (V/
s)
300
350
450
500
25
25
75
125
LT1224 TPC18
100
50
0
250
400
V
S
= 15V
A
V
= 2
SR
+SR
FREQUENCY (Hz)
10k
0.01
OUTPUT IMPEDANCE (
)
0.1
1
10
100
100k
1M
10M
100M
LT1224 TPC16
V
S
= 15V
T
A
= 25C
A
V
= 1
FREQUENCY (Hz)
1M
10
VOLTAGE MAGNITUDE (dB)
6
4
0
4
6
10
10M
100M
LT1224 TPC15
V
S
= 15V
T
A
= 25C
A
V
= 1
8
2
2
8
C = 1000pF
C = 0
C = 50pF
C = 100pF
C = 500pF
FREQUENCY (Hz)
100
20
VOLTAGE GAIN (dB)
20
60
80
1k
100k
1M
100M
LT1224 TPC14
10M
10k
0
40
V
S
= 15V
V
S
= 15V
V
S
= 5V
V
S
= 5V
T
A
= 25C
0
PHASE MARGIN (DEGREES)
40
80
100
20
60
TEMPERATURE (C)
50
42
GAIN BANDWIDTH (MHz)
44
45
47
48
25
25
75
125
LT1224 TPC17
100
50
0
43
46
V
S
= 15V
FREQUENCY (Hz)
INPUT VOLTAGE NOISE (nV/
Hz)
10
1k
10k
100k
LT1224 TPC10
10
100
100
1000
10000
INPUT CURRENT NOISE (pA/
Hz)
0.1
1
10
100
V
S
= 15V
T
A
= 25C
A
V
= +101
R
S
= 100k
e
n
i
n
FREQUENCY (Hz)
0
COMMON-MODE REJECTION RATIO (dB)
40
100
120
1k
100k
1M
100M
LT1224 TPC12
10M
10k
20
60
80
V
S
= 15V
T
A
= 25C
FREQUENCY (Hz)
100
0
POWER SUPPLY REJECTION RATIO (dB)
40
80
100
1k
100k
1M
100M
LT1224 TPC11
10M
10k
20
60
V
S
= 15V
T
A
= 25C
+PSRR
PSRR
SETTLING TIME (ns)
10
OUTPUT SWING (V)
4
8
10
0
60
80
120
LT1224 TPC13
100
20
6
0
4
6
2
2
8
40
V
S
= 15V
T
A
= 25C
10mV SETTLING
A
V
= +1
A
V
= 1
A
V
= +1
A
V
= 1
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