LT1225
Very High Speed
Operational Amplifier
FEATURES
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
Gain of 5 Stable
150MHz Gain Bandwidth
400V/µs Slew Rate
20V/mV DC Gain, R
L
= 500Ω
1mV Maximum Input Offset Voltage
±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 LT1225 is a very high speed operational amplifier with
excellent DC performance. The LT1225 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 LT1225 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
20MHz,A
V
= 50 Instrumentation Amplifier
+
LT1225
Gain of 5 Pulse Response
–
1k
10k
1k
+
V
IN
250Ω
200pF
+
LT1225
V
OUT
1k
250Ω
1k
–
–
10k
–
LT1225
+
LT1225 TA01
U
LT1225 TA02
UO
UO
1
LT1225
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
LT1225C ................................................ 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
LT1225CN8
LT1225CS8
S8 PART MARKING
1225
N8 PACKAGE
S8 PACKAGE
8-LEAD PLASTIC DIP 8-LEAD PLASTIC SOIC
LT1225 PO01
T
J MAX
= 15O°C,
θ
JA
= 130°C/ W (N8)
T
J MAX
= 15O°C,
θ
JA
= 220°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, V
CM
= 0V unless otherwise noted.
MIN
TYP
0.5
100
4
MAX
1.0
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
7.5
1.5
40
70
2
12
14
–13
115
95
20
±13.3
40
400
6.4
150
7
20
7
90
1.0
1.7
4.5
7
V
CM
=
±12V
V
S
=
±5V
to
±15V
V
OUT
=
±10V,
R
L
= 500Ω
R
L
= 500Ω
V
OUT
=
±12V
(Note 3)
10V Peak, (Note 4)
f = 1MHz
A
VCL
= 5, 10% to 90%, 0.1V
A
VCL
= 5, 0.1V
50% V
IN
to 50% V
OUT
10V Step, 0.1%, A
V
= – 5
f = 3.58MHz, A
V
= 5, R
L
= 150Ω
f = 3.58MHz, A
V
= 5, R
L
= 150Ω
A
VCL
= 5, f = 1MHz
94
86
12.5
±12.0
24
250
2
U
W
U
U
W W
W
LT1225
ELECTRICAL CHARACTERISTICS
V
S
=
±5V,
T
A
= 25°C, 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 Voltage
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
(Note 3)
3V Peak, (Note 4)
f = 1MHz
A
VCL
= 5, 10% to 90%, 0.1V
A
VCL
= 5, 0.1V
50% V
IN
to 50% V
OUT
– 2.5V to 2.5V, 0.1%, A
V
= – 4
94
10
±3.0
±3.0
20
2.5
CONDITIONS
(Note 2)
MIN
TYP
1.0
100
4
4
–3
115
15
13
±3.7
±3.3
40
250
13.3
100
9
10
9
70
7
9
– 2.5
MAX
2.0
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, V
CM
= 0V unless otherwise noted.
MIN
TYP
0.5
1.0
10
100
4
93
85
10
8
±12.0
±3.0
24
20
250
115
95
12.5
10
±13.3
±3.3
40
40
400
7
10.5
MAX
1.5
2.5
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,
(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 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/2πVp.
3
LT1225
TYPICAL PERFOR A CE CHARACTERISTICS
Input Common-Mode Range vs
Supply Voltage
20
MAGNITUDE OF INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
15
7.5
OUTPUT VOLTAGE SWING (V)
T
A
= 25°C
∆V
OS
< 1mV
10
+V
CM
5
–V
CM
0
0
5
10
15
20
LT1225 TPC01
SUPPLY VOLTAGE (±V)
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)
LT1225 TPC04
Supply Current vs Temperature
10
V
S
= ±15V
9
4.75
5.0
INPUT BIAS CURRENT (µA)
V
S
= ±15V
I +I
I
B
=
B+ B–
2
OUTPUT SHORT-CIRCUIT CURRENT (mA)
SUPPLY CURRENT (mA)
8
7
6
5
4
–50
–25
0
25
50
75
TEMPERATURE (°C)
LT1225 TPC07
4
U W
100
Supply Current vs Supply Voltage
8.0
T
A
= 25°C
15
20
Output Voltage Swing vs
Supply Voltage
T
A
= 25°C
R
L
= 500Ω
∆V
OS
= 30mV
+V
SW
10
–V
SW
5
7.0
6.5
6.0
0
5
10
15
20
LT1225 TPC02
0
0
5
10
15
20
LT1225 TPC03
SUPPLY VOLTAGE (±V)
SUPPLY VOLTAGE (±V)
Input Bias Current vs Input
Common-Mode Voltage
5.0
V
S
= ±15V
T
A
= 25°C
I
B+
+ I
B–
I
B
=
2
100
Open-Loop Gain vs
Resistive Load
T
A
= 25°C
90
V
S
= ±15V
V
S
= ±5V
4.5
80
4.0
70
3.5
60
10k
3.0
–15
50
–10
–5
0
5
10
15
10
100
1k
10k
LT1225 TPC06
INPUT COMMON-MODE VOLTAGE (V)
LT1225 TPC05
LOAD RESISTANCE (Ω)
Input Bias Current vs Temperature
55
50
45
40
Output Short-Circuit Current vs
Temperature
V
S
= ±5V
4.5
4.25
4.0
3.75
3.5
–50
SOURCE
35
30
25
–50
SINK
125
–25
0
25
50
75
100
125
–25
0
25
50
75
100
125
TEMPERATURE (°C)
LT1225 TPC08
TEMPERATURE (°C)
LT1225 TPC09
LT1225
TYPICAL PERFOR A CE CHARACTERISTICS
Input Noise Spectral Density
1000
INPUT VOLTAGE NOISE (nV/√Hz)
POWER SUPPLY REJECTION RATIO (dB)
COMMON MODE REJECTION RATIO (dB)
i
n
100
1.0
10
V
S
= ±15V
T
A
= 25°C
A
V
= 101
R
S
= 100k
10
100
e
n
1
1k
FREQUENCY (Hz)
10k
Voltage Gain and Phase vs
Frequency
100
V
S
= ±15V
80
80
V
S
= ±5V
60
V
S
= ±5V
V
S
= ±15V
60
100
VOLTAGE MAGNITUDE (dB)
VOLTAGE GAIN (dB)
OUTPUT SWING (V)
40
20
T
A
= 25°C
0
100
1k
10k
100k 1M
FREQUENCY (Hz)
10M
Closed-Loop Output Impedance vs
Frequency
100
V
S
= ±15V
T
A
= 25°C
A
V
= 5
153
OUTPUT IMPEDANCE (Ω)
GAIN BANDWIDTH (MHz)
10
SLEW RATE (V/µs)
1
0.1
0.01
10k
100k
1M
FREQUENCY (Hz)
10M
U W
LT1225 TPC10
LT1225 TPC13
Power Supply Rejection Ratio vs
Frequency
10
INPUT CURRENT NOISE (pA/√Hz)
Common-Mode Rejection Ratio vs
Frequency
120
100
80
60
40
20
0
V
S
= ±15V
T
A
= 25°C
100
V
S
= ±15V
T
A
= 25°C
80
+PSRR
60
–PSRR
40
0.1
20
0.01
100k
0
100
1k
10k
100k 1M
FREQUENCY (Hz)
10M
100M
1k
10k
100k
1M
FREQUENCY (Hz)
10M
100M
LT1225 TPC11
LTXXXX • TPCXX
Output Swing vs Settling Time
10
8
6
PHASE MARGIN (DEG)
Frequency Response vs
Capacitive Load
24
22
20
18
16
14
12
10
8
6
4
C = 1000pF
C = 500pF
V
S
= ±15V
T
A
= 25°C
A
V
= –5
C = 100pF
C = 50pF
C = 0pF
V
S
= ±15
T
A
= 25°C
10mV SETTLING
A
V
= –5
A
V
= 5
4
2
0
–2
–4
–6
–8
40
20
A
V
= –5
A
V
= 5
0
100M
–10
0
20
60
80
40
SETTLING TIME (ns)
100
120
1M
10M
FREQUENCY (HZ)
100M
LT1225 TPC15
LTC1225 TPC14
Gain Bandwidth vs Temperature
500
V
S
= ±15V
152
151
150
149
148
147
–50 –25
Slew Rate vs Temperature
V
S
= ±15V
A
V
= –5
–SR
400
+SR
350
300
250
200
–50 –25
450
100M
LT1225 TPC16
50
25
75
0
TEMPERATURE (˚C)
100
125
50
25
75
0
TEMPERATURE (˚C)
100
125
LT1225 TPC17
LT1225 TPC18
5
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