1
LT1226
s
Gain of 25 Stable
s
1GHz Gain Bandwidth
s
400V/
s Slew Rate
s
2.6nV/
Hz Input Noise Voltage
s
50V/mV Minimum DC Gain, R
L
= 500
s
1mV Maximum Input Offset Voltage
s
12V Minimum Output Swing into 500
s
Wide Supply Range
2.5V to
15V
s
7mA Supply Current
s
100ns Settling Time to 0.1%, 10V Step
s
Drives All Capacitive Loads
D
U
ESCRIPTIO
S
FEATURE
The LT1226 is a low noise, very high speed operational
amplifier with excellent DC performance. The LT1226
features low input offset voltage and high DC gain. 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 LT1226 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
Photodiode Preamplifier, A
V
= 5.1k
, BW = 15MHz
Gain of +25 Pulse Response
Low Noise Very High Speed
Operational Amplifier
5.1k
LT1226 TA01
+
LT1226
51
51
V
+
LT1226 TA02
LT1226
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
LT1226C ................................................ 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
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
(Note 2)
0.3
1.0
mV
I
OS
Input Offset Current
100
400
nA
I
B
Input Bias Current
4
8
A
e
n
Input Noise Voltage
f = 10kHz
2.6
nV/
Hz
i
n
Input Noise Current
f = 10kHz
1.5
pA/
Hz
R
IN
Input Resistance
V
CM
=
12V
24
40
M
Differential
15
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
94
103
dB
PSRR
Power Supply Rejection Ratio
V
S
=
5V to
15V
94
110
dB
A
VOL
Large Signal Voltage Gain
V
OUT
=
10V, R
L
= 500
50
150
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
(Note 3)
250
400
V/
s
Full Power Bandwidth
10V Peak, (Note 4)
6.4
MHz
GBW
Gain Bandwidth
f = 1MHz
1
GHz
t
r
, t
f
Rise Time, Fall Time
A
VCL
= + 25,10% to 90%, 0.1V
5.5
ns
Overshoot
A
VCL
= +25, 0.1V
35
%
Propagation Delay
50% V
IN
to 50% V
OUT
5.5
ns
t
s
Settling Time
10V Step, 0.1%, A
V
= 25
100
ns
Differential Gain
f = 3.58MHz, A
V
= +25, R
L
= 150
0.7
%
Differential Phase
f = 3.58MHz, A
V
= +25, R
L
= 150
0.6
Deg
R
O
Output Resistance
A
VCL
= +25, f = 1MHz
3.1
I
S
Supply Current
7
9
mA
ELECTRICAL C
C
HARA TERISTICS
V
S
=
15V, T
A
= 25
C, V
CM
= 0V unless otherwise noted.
1
2
3
4
5
6
7
8
TOP VIEW
NULL
V
+
NULL
IN
OUT
NC
+IN
V
S8 PACKAGE
8-LEAD PLASTIC SOIC
N8 PACKAGE
8-LEAD PLASTIC DIP
LT1226 PO01
ORDER PART
NUMBER
S8 PART MARKING
1226
LT1226CN8
LT1226CS8
3
LT1226
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
V
S
=
15V, (Note 2)
0.3
1.3
mV
V
S
=
5V, (Note 2)
1.0
1.8
mV
Input V
OS
Drift
6
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
92
103
dB
PSRR
Power Supply Rejection Ratio
V
S
=
5V to
15V
92
110
dB
A
VOL
Large Signal Voltage Gain
V
S
=
15V, V
OUT
=
10V, R
L
= 500
35
150
V/mV
V
S
=
5V, V
OUT
=
2.5V, R
L
= 500
35
100
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, (Note 3)
250
400
V/
s
I
S
Supply Current
V
S
=
15V and V
S
=
5V
7
10.5
mA
V
S
=
5V, T
A
= 25
C, V
CM
= 0V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
(Note 2)
1.0
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
94
103
dB
A
VOL
Large Signal Voltage Gain
V
OUT
=
2.5V, R
L
= 500
50
100
V/mV
V
OUT
=
2.5V, R
L
= 150
75
V/mV
V
OUT
Output Voltage
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
(Note 3)
250
V/
s
Full Power Bandwidth
3V Peak, (Note 4)
13.3
MHz
GBW
Gain Bandwidth
f = 1MHz
700
MHz
t
r
, t
f
Rise Time, Fall Time
A
VCL
= +25, 10% to 90%, 0.1V
8
ns
Overshoot
A
VCL
= +25, 0.1V
25
%
Propagation Delay
50% V
IN
to 50% V
OUT
8
ns
t
s
Settling Time
2.5V to 2.5V, 0.1%, A
V
= 24
60
ns
I
S
Supply Current
7
9
mA
ELECTRICAL C
C
HARA TERISTICS
ELECTRICAL C
C
HARA TERISTICS
Note 3: Slew rate is measured between
10V on an output swing of
12V
on
15V supplies, and
2V on an output swing of
3.5V on
5V supplies.
Note 4: Full power bandwidth is calculated from the slew rate
measurement: FPBW = SR/2
Vp.
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.
0
C
T
A
70
C, V
CM
= 0V unless otherwise noted.
LT1226
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
SUPPLY VOLTAGE (V)
0
0
MAGNITUDE OF INPUT VOLTAGE (V)
5
10
15
20
5
10
15
20
LT1226 TPC01
T
A
= 25C
V
OS
< 1mV
+V
CM
V
CM
SUPPLY VOLTAGE (V)
0
6.0
SUPPLY CURRENT (mA) 6.5
7.0
7.5
8.0
5
10
15
20
LT1226 TPC02
T
A
= 25C
SUPPLY VOLTAGE (V)
0
0
OUTPUT VOLTAGE SWING (V)
5
10
15
20
5
10
15
20
LT1226 TPC03
T
A
= 25C
R
L
= 500
V
OS
= 30mV
+V
SW
V
SW
LOAD RESISTANCE (
)
10
0
OUTPUT VOLTAGE SWING (Vp-p)
10
20
25
30
100
1k
10k
LT1226 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
LT1226 TPC05
5
5
V
S
= 15V
T
A
= 25C
I
B+
+ I
B
2
I
B
=
LOAD RESISTANCE (
)
10
70
OPEN LOOP GAIN (dB)
100
110
120
100
1k
10k
LT1226 TPC06
90
80
T
A
= 25C
V
S
= 15V
V
S
= 5V
TEMPERATURE (C)
50
4
SUPPLY CURRENT (mA)
6
7
9
10
25
25
75
125
LT1226 TPC07
V
S
= 15V
100
50
0
5
8
TEMPERATURE (C)
50
25
OUTPUT SHORT CIRCUIT CURRENT (mA)
35
40
50
55
25
25
75
125
LT1226 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
5.0
25
25
75
125
LT1226 TPC08
100
50
0
3.75
4.5
V
S
= 15V
I
B+
+ I
B
2
I
B
=
5
LT1226
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
FREQUENCY (Hz)
1k
0
COMMON MODE REJECTION RATIO (dB)
20
40
60
80
100
120
10k
100k
1M
10M
LT1226 TPC12
100M
V
S
= 15V
T
A
= 25C
TEMPERATURE (C)
50
GAIN BANDWIDTH (MHz)
1.05
1.10
1.15
25
75
LT1226 TPC17
1.0
0.95
25
0
50
100
125
0.90
0.85
V
S
= 15V
FREQUENCY (Hz)
100
10
VOLTAGE GAIN (dB)
30
50
70
90
110
1k
10k
100k
1M
LT1226 TPC13
10M
100M
0
20
40
60
80
100
PHASE MARGIN (DEGREES)
V
S
= 15V
V
S
= 5V
T
A
= 25C
V
S
= 5V
V
S
= 15V
TEMPERATURE (C)
50
SLEW RATE (V/
s)
400
450
500
25
75
LT1226 TPC18
350
300
25
0
50
100
125
250
200
SR
+SR
V
S
= 15V
A
V
= 25
FREQUENCY (Hz)
10k
OUTPUT IMPEDANCE (
)
1
10
100M
LT1226 TPC16
0.1
0.01
100k
1M
10M
100
V
S
= 15V
T
A
= 25C
A
V
= +25
FREQUENCY (Hz)
INPUT VOLTAGE NOISE (nV/
Hz)
1
100
10
1k
10k
100k
LT1226 TPC10
100
1000
10
V
S
= 15V
T
A
= 25C
A
V
= +101
R
S
= 100k
i
n
e
n
0.01
1.0
10
0.1
INPUT VOLTAGE NOISE (nV/
Hz)
FREQUENCY (Hz)
100
0
POWER SUPPLY REJECTION RATIO (dB)
40
60
80
100
120
1k
10k
100k
1M
LT1226 TPC11
10M
100M
V
S
= 15V
T
A
= 25C
+PSRR
PSRR
SETTLING TIME (ns)
0
OUTPUT SWING (V)
2
6
10
80
2
6
10
20
40
60
100
120
LTC1226 TPC14
0
4
8
4
8
V
S
= 15
T
A
= 25C
10mV SETTLING
A
V
= +25
A
V
= 25
A
V
= 25
A
V
= +25
FREQUENCY (HZ)
1M
18
VOLTAGE MAGNITUDE (dB)
22
26
30
34
38
10M
100M
C = 100pF
C = 0pF
C = 50pF
LT1226 TPC15
20
24
28
32
36
V
S
= 15V
T
A
= 25C
A
V
= 25
C = 1000pF
C = 500pF
PDF 
ZIP