LT1224
Very High Speed
Operational Amplifier
FEATURES
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
Unity-Gain Stable
45MHz Gain-Bandwidth
400V/µs Slew Rate
7V/mV DC Gain: R
L
= 500Ω
Maximum Input Offset Voltage: 2mV
±12V
Minimum Output Swing into 500Ω
Wide Supply Range:
±2.5V
to
±15V
7mA Supply Current
90ns Settling Time to 0.1%, 10V Step
Drives All Capacitive Loads
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 500Ω load to
±12V
with
±15V
supplies and a 150Ω 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.
APPLICATI
s
s
s
s
s
s
S
Wideband Amplifiers
Buffers
Active Filters
Video and RF Amplification
Cable Drivers
Data Acquisition Systems
TYPICAL APPLICATI
DAC Current-to-Voltage Converter
7pF
Inverter Pulse Response
5k
DAC-08
TYPE
–
LT1224
V
OUT
+
0.1µF
5k
1 LSB SETTLING = 140ns
LT1224 • TA01
LT1224 • TA02
U
UO
UO
1
LT1224
ABSOLUTE
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
NULL
–IN
+IN
V
–
1
2
3
4
8
7
6
5
NULL
V
+
OUT
NC
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
ORDER PART
NUMBER
LT1224CN8
LT1224CS8
S8 PART MARKING
1224
N8 PACKAGE
8-LEAD PLASTIC DIP
S8 PACKAGE
8-LEAD PLASTIC SOIC
LT1224 • POI01
T
JMAX
= 150°C,
θ
JA
= 100°C/W (N8)
T
JMAX
= 150°C,
θ
JA
= 150°C/W (S8)
ELECTRICAL CHARACTERISTICS
SYMBOL
V
OS
I
OS
I
B
e
n
i
n
R
IN
C
IN
PARAMETER
Input Offset Voltage
Input Offset Current
Input Bias Current
Input Noise Voltage
Input Noise Current
Input Resistance
Input Capacitance
Input Voltage Range
+
Input Voltage Range
–
CMRR
PSRR
A
VOL
V
OUT
I
OUT
SR
GBW
t
r
, t
f
Common-Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Output Swing
Output Current
Slew Rate
Full Power Bandwidth
Gain-Bandwidth
Rise Time, Fall Time
Overshoot
Propagation Delay
t
s
Settling Time
Differential Gain
Differential Phase
R
O
I
S
Output Resistance
Supply Current
V
S
=
±15V,
T
A
= 25°C, R
L
= 1k, V
CM
= 0V unless otherwise noted.
MIN
TYP
0.5
100
4
MAX
2.0
400
8
UNITS
mV
nA
µA
nV/√Hz
pA/√Hz
MΩ
kΩ
pF
V
– 12
V
dB
dB
V/mV
V
mA
V/µs
MHz
MHz
ns
%
ns
ns
%
Deg
Ω
9
mA
CONDITIONS
(Note 2)
f = 10kHz
f = 10kHz
V
CM
=
±12V
Differential
24
22
1.5
40
250
2
12
14
– 13
100
84
7
±13.3
40
400
6.4
45
5
30
5
90
1
2.4
2.5
7
V
CM
=
±12V
V
S
=
±5V
to
±15V
V
OUT
=
±10V,
R
L
= 500Ω
R
L
= 500Ω
V
OUT
=
±12V
A
VCL
= –2, (Note 3)
10V Peak, (Note 4)
f = 1MHz
A
VCL
= 1, 10% to 90%, 0.1V
A
VCL
= 1, 0.1V
50% V
IN
to 50% V
OUT
10V Step, 0.1%
f = 3.58MHz, R
L
= 150Ω
f = 3.58MHz, R
L
= 150Ω
A
VCL
= 1, f = 1MHz
86
75
3.3
±12.0
24
250
2
U
W
U
U
W W
W
LT1224
ELECTRICAL CHARACTERISTICS
V
S
=
±5V,
T
A
= 25°C, R
L
= 1k, V
CM
= 0V unless otherwise noted.
SYMBOL
V
OS
I
OS
I
B
PARAMETER
Input Offset Voltage
Input Offset Current
Input Bias Current
Input Voltage Range
+
Input Voltage Range
–
CMRR
A
VOL
V
OUT
I
OUT
SR
GBW
t
r
, t
f
Common-Mode Rejection Ratio
Large-Signal Voltage Gain
Output Swing
Output Current
Slew Rate
Full Power Bandwidth
Gain-Bandwidth
Rise Time, Fall Time
Overshoot
Propagation Delay
t
s
I
S
Settling Time
Supply Current
V
CM
=
±2.5V
V
OUT
=
±2.5V,
R
L
= 500Ω
V
OUT
=
±2.5V,
R
L
= 150Ω
R
L
= 500Ω
R
L
= 150Ω
V
OUT
=
±3V
A
VCL
= –2, (Note 3)
3V Peak, (Note 4)
f = 1MHz
A
VCL
= 1, 10% to 90%, 0.1V
A
VCL
= 1, 0.1V
50% V
IN
to 50% V
OUT
–2.5V to 2.5V, 0.1%
86
2.5
±3.0
±3.0
20
2.5
CONDITIONS
(Note 2)
MIN
TYP
1
100
4
4
–3
98
7
3
±3.7
±3.3
40
250
13.3
34
7
20
7
90
7
9
– 2.5
MAX
4
400
8
UNITS
mV
nA
µA
V
V
dB
V/mV
V/mV
V
V
mA
V/µs
MHz
MHz
ns
%
ns
ns
mA
ELECTRICAL CHARACTERISTICS
SYMBOL
V
OS
PARAMETER
Input Offset Voltage
Input V
OS
Drift
I
OS
I
B
CMRR
PSRR
A
VOL
V
OUT
I
OUT
SR
I
S
Input Offset Current
Input Bias Current
Common-Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Output Swing
Output Current
Slew Rate
Supply Current
CONDITIONS
0°C
≤
T
A
≤
70°C, R
L
= 1k, V
CM
= 0V unless otherwise noted.
MIN
TYP
1
2
25
100
4
83
73
2.5
2.0
±12.0
±3.0
24
20
250
98
84
7
7
±13.3
±3.3
40
40
400
7
10.5
MAX
4
5
600
9
UNITS
mV
mV
µV/°C
nA
µA
dB
dB
V/mV
V/mV
V
V
mA
mA
V/µs
mA
V
S
=
±15V,
(Note 2)
V
S
=
±5V,
(Note 2)
V
S
=
±15V
and V
S
=
±5V
V
S
=
±15V
and V
S
=
±5V
V
S
=
±15V,
V
CM
=
±12V
and V
S
=
±5V,
V
CM
=
±2.5V
V
S
=
±5V
to
±15V
V
S
=
±15V,
V
OUT
=
±10V,
R
L
= 500Ω
V
S
=
±5V,
V
OUT
=
±2.5V,
R
L
= 500Ω
V
S
=
±15V,
R
L
= 500Ω
V
S
=
±5V,
R
L
= 500Ω or 150Ω
V
S
=
±15V,
V
OUT
=
±12V
V
S
=
±5V,
V
OUT
=
±3V
V
S
=
±15V,
A
VCL
= –2, (Note 3)
V
S
=
±15V
and V
S
=
±5V
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/2πVp.
3
LT1224
TYPICAL PERFOR A CE CHARACTERISTICS
Input Common-Mode Range vs
Supply Voltage
20
8.0
T
A
= 25°C
∆V
OS
< 1mV
SUPPLY CURRENT (mA)
MAGNITUDE OF INPUT VOLTAGE (V)
OUTPUT VOLTAGE SWING (V)
15
10
+V
CM
5
–V
CM
0
0
5
10
15
20
SUPPLY VOLTAGE (±V)
LT1224 • TPC01
Output Voltage Swing vs
Resistive Load
30
OUTPUT VOLTAGE SWING (Vp-p)
25
20
15
10
5
0
10
T
A
= 25°C
∆V
OS
= 30mV
INPUT BIAS CURRENT (µA)
V
S
= ±15V
OPEN-LOOP GAIN (dB)
V
S
= ±5V
100
1k
LOAD RESISTANCE (Ω)
LT1224 • TPC04
Supply Current vs Temperature
10
V
S
= ±15V
9
INPUT BIAS CURRENT (µA)
SUPPLY CURRENT (mA)
4.75
4.5
4.25
4.0
3.75
3.5
–50
V
S
= ±15V
I
+
+ I
B–
I
B
=
B
2
OUTPUT SHORT-CIRCUIT CURRENT (mA)
8
7
6
5
4
–50
–25
0
25
50
75
TEMPERATURE (°C)
LT1224 • TPC07
4
U W
100
Supply Current vs Supply Voltage
20
Output Voltage Swing vs
Supply Voltage
T
A
= 25°C
R
L
= 500Ω
∆V
OS
= 30mV
15
+V
SW
10
–V
SW
5
T
A
= 25°C
7.5
7.0
6.5
6.0
0
5
10
15
20
SUPPLY VOLTAGE (±V)
LT1224 • TPC02
0
0
5
10
15
20
SUPPLY VOLTAGE (±V)
LT1224 • TPC03
Input Bias Current vs Input
Common-Mode Voltage
5.0
V
S
= ±15V
T
A
= 25°C
I
B+
+ I
B–
I
B
=
2
Open-Loop Gain vs
Resistive Load
100
T
A
= 25°C
4.5
90
80
V
S
= ±15V
4.0
70
V
S
= ±5V
3.5
60
10k
3.0
–15
–10
–5
0
5
10
15
50
10
100
1k
10k
LT1224 • TPC06
INPUT COMMON-MODE VOLTAGE (V)
LT1224 • TPC05
LOAD RESISTANCE (Ω)
Input Bias Current vs Temperature
50
55
50
45
40
Output Short Circuit Current vs
Temperature
V
S
= ±5V
SOURCE
35
30
25
–50
SINK
125
–25
0
25
50
75
100
125
–25
0
25
50
75
100
125
TEMPERATURE (°C)
LT1224 • TPC08
TEMPERATURE (°C)
LT1224 • TPC09
LT1224
TYPICAL PERFOR A CE CHARACTERISTICS
Input Noise Spectral Density
10000
100
POWER SUPPLY REJECTION RATIO (dB)
COMMON-MODE REJECTION RATIO (dB)
INPUT VOLTAGE NOISE (nV/√Hz)
V
S
= ±15V
T
A
= 25°C
A
V
= +101
R
S
= 100k
1000
10
i
n
100
e
n
10
10
0.1
100k
1
100
1k
FREQUENCY (Hz)
10k
Voltage Gain and Phase vs
Frequency
80
V
S
= ±15V
60
V
S
= ±5V
V
S
= ±15V
40
V
S
= ±5V
20
40
60
80
100
10
8
6
VOLTAGE GAIN (dB)
OUTPUT SWING (V)
4
2
0
–2
–4
–6
–8
VOLTAGE MAGNITUDE (dB)
0
T
A
= 25°C
–20
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
LT1224 • TPC14
Closed-Loop Output Impedance vs
Frequency
100
V
S
= ±15V
T
A
= 25°C
A
V
= 1
10
48
47
OUTPUT IMPEDANCE (Ω)
GAIN BANDWIDTH (MHz)
46
45
44
43
SLEW RATE (V/µs)
1
0.1
0.01
10k
100k
1M
FREQUENCY (Hz)
10M
U W
LT1224 • TPC10
Power Supply Rejection Ratio vs
Frequency
100
V
S
= ±15V
T
A
= 25°C
80
+PSRR
60
–PSRR
40
Common Mode Rejection Ratio vs
Frequency
120
100
80
60
40
20
0
1k
10k
100k
1M
10M
100M
FREQUENCY (Hz)
V
S
= ±15V
T
A
= 25°C
INPUT CURRENT NOISE (pA/√Hz)
20
0
100
1k
10k
100k
1M
10M
100M
FREQUENCY (Hz)
LT1224 • TPC11
LT1224 • TPC12
Output Swing vs Settling Time
10
V
S
= ±15V
T
A
= 25°C
10mV SETTLING
A
V
= +1
A
V
= –1
8
6
4
2
0
–2
–4
–6
–8
–10
0
20
40
60
80
100
120
Frequency Response vs
Capacitive Load
V
S
= ±15V
T
A
= 25°C
A
V
= –1
C = 100pF
C = 50pF
PHASE MARGIN (DEGREES)
C=0
C = 500pF
C = 1000pF
20
A
V
= +1
A
V
= –1
0
100M
–10
SETTLING TIME (ns)
LT1224 • TPC13
1M
10M
FREQUENCY (Hz)
100M
LT1224 • TPC15
Gain-Bandwidth vs Temperature
500
V
S
= ±15V
450
Slew Rate vs Temperature
V
S
= ±15V
A
V
= –2
–SR
400
+SR
350
300
250
200
–50
100M
42
–50
–25
0
25
50
75
100
125
–25
0
25
50
75
100
125
TEMPERATURE (°C)
LT1224 • TPC16
LT1224 • TPC17
TEMPERATURE (°C)
LT1224 • TPC18
5
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