1
LT1220
45MHz, 250V/
s
Operational Amplifier
S
FEATURE
D
U
ESCRIPTIO
s
Gain-Bandwidth: 45MHz
s
Unity-Gain Stable
s
Slew Rate: 250V/
s
s
C-Load
TM
Op Amp Drives Capacitive Loads
s
Maximum Input Offset Voltage: 1mV
s
Maximum Input Bias Current: 300nA
s
Maximum Input Offset Current: 300nA
s
Minimum Output Swing Into 500
:
12V
s
Minimum DC Gain: 20V/mV, R
L
= 500
s
Settling Time to 0.1%: 75ns, 10V Step
s
Settling Time to 0.01%: 95ns, 10V Step
s
Differential Gain: 0.1%, A
V
= 2, R
L
= 150
s
Differential Phase: 0.2
, A
V
= 2, R
L
= 150
The LT1220 is a high speed operational amplifier with
superior DC performance. The LT1220 features reduced
input offset voltage, lower input bias currents and higher
DC gain than devices with comparable bandwidth and slew
rate. The circuit is a single gain stage that includes
proprietary DC gain enhancement circuitry to obtain pre-
cision with high speed. The high gain and fast settling time
make the circuit an ideal choice for data acquisition
systems. The circuit is also capable of driving large
capacitive loads which makes it useful in buffer or cable
driver applications.
The LT1220 is a member of a family of fast, high perfor-
mance amplifiers that employ Linear Technology
Corporation's advanced complementary bipolar process-
ing. For applications with gains of 4 or greater the LT1221
can be used, and for gains of 10 or greater the LT1222 can
be used for increased bandwidth.
s
Wideband Amplifiers
s
Buffers
s
Active Filters
s
Video and RF Amplification
s
Cable Drivers
s
8-, 10-, 12-Bit Data Acquisition Systems
U
S
A
O
PPLICATI
TYPICAL APPLICATIO
N
U
Two Op Amp Instrumentation Amplifier
Inverter Pulse Response
LT1220 TA02
R
F
= R
G
= 1k
V
S
=
15V
V
IN
= 20V
f = 2MHz
+
+
LT1220
GAIN = [R4/R3][1 + (1/2)(R2/R1 + R3/R4) + (R2 + R3)/R5] = 102
TRIM R5 FOR GAIN
TRIM R1 FOR COMMON-MODE REJECTION
BW = 450kHz
V
IN
V
OUT
+
LT1220
LT1220 TA01
R3
1k
R5
220
R4
10k
R2
1k
R1
10k
and LTC are registered trademarks and LT is a trademark of Linear Technology Corporation.
C-Load is a trademark of Linear Technology Cortporation.
2
LT1220
A
U
G
W
A
W
U
W
A
R
BSOLUTE
XI
TI
S
Total Supply Voltage (V
+
to V
) .............................. 36V
Differential Input Voltage ........................................
6V
Input Voltage ..........................................................
V
S
Output Short-Circuit Duration (Note 1) ........... Indefinite
Specified Temperature Range
LT1220C (Note 2) ................................... 0
C to 70
C
LT1220M ......................................... 55
C to 125
C
Operating Temperature Range
LT1220C ........................................... 40
C TO 85
C
LT1220M ......................................... 55
C to 150
C
Maximum Junction Temperature (See Below)
Plastic Package ............................................... 150
C
Ceramic Package ............................................. 175
C
Storage Temperature Range ................ 65
C to 150
C
Lead Temperature (Soldering, 10 sec) ................. 300
C
W
U
U
PACKAGE/ORDER I FOR ATIO
Consult factory for Industrial grade parts.
LT1220CN8
LT1220MJ8
LT1220CS8
ORDER PART
NUMBER
1
2
3
4
8
7
6
5
TOP VIEW
NULL
IN
+IN
V
NULL
V
+
V
OUT
NC
N8 PACKAGE
8-LEAD PLASTIC DIP
S8 PACKAGE
8-LEAD PLASTIC SOIC
J8 PACKAGE
8-LEAD CERAMIC DIP
T
JMAX
= 175
C,
JA
= 100
C/W (J)
T
JMAX
= 150
C,
JA
= 130
C/W (N)
T
JMAX
= 150
C,
JA
= 190
C/W (S)
S8 PART MARKING
1220
ORDER PART
NUMBER
SPECIAL
ORDER
CONSULT
FACTORY
T
JMAX
= 175
C,
JA
= 150
C/W
TOP VIEW
V
+
NULL
NULL
IN
V
OUT
NC
+IN
V
8
7
6
5
3
2
1
4
H PACKAGE
8-LEAD TO-5 METAL CAN
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
(Note 3)
0.5
1
mV
I
OS
Input Offset Current
100
300
nA
I
B
Input Bias Current
100
300
nA
e
n
Input Noise Voltage
f = 10kHz
17
nV/
Hz
i
n
Input Noise Current
f = 10kHz
2
pA/
Hz
R
IN
Input Resistance
V
CM
=
12V
20
45
M
Differential
150
k
C
IN
Inut Capacitance
2
pF
Input Voltage Range (Positive)
12
14
V
Input Voltage Range (Negative)
13
12
V
CMRR
Common-Mode Rejection Ratio
V
CM
=
12V
92
114
dB
PSRR
Power Supply Rejection Ratio
V
S
=
5V to
15V
90
94
dB
A
VOL
Large-Signal Voltage Gain
V
OUT
=
10V, R
L
= 500
20
50
V/mV
V
OUT
Output Swing
R
L
= 500
12
13
V
I
OUT
Output Current
V
OUT
=
12V
24
26
mA
SR
Slew Rate
(Note 4)
200
250
V/
s
Full Power Bandwidth
10V Peak (Note 5)
4
MHz
GBW
Gain-Bandwidth
f = 1MHz
45
MHz
V
S
=
15V, T
A
= 25
C, V
CM
= 0V, unless otherwise specified.
ELECTRICAL CHARACTERISTICS
3
LT1220
ELECTRICAL CHARACTERISTICS
V
S
=
15V, T
A
= 25
C, V
CM
= 0V, unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
t
r
, t
f
Rise Time, Fall Time
A
V
= 1, 10% to 90%, 0.1V
2.5
ns
Overshoot
A
V
= 1, 0.1V
5
%
Propagation Delay
A
V
= 1, 50% V
IN
to 50% V
OUT
, 0.1V
4.9
ns
t
s
Settling Time
10V Step, 0.1%
75
ns
10V Step, 0.01%
95
ns
Differential Gain
f = 3.58MHz, R
L
= 150
(Note 6)
0.10
%
f = 3.58MHz, R
L
= 1k (Note 6)
0.02
%
Differential Phase
f = 3.58MHz, R
L
= 150
(Note 6)
0.20
DEG
f = 3.58MHz, R
L
= 1k (Note 6)
0.03
DEG
R
O
Output Resistance
A
V
= 1, f = 1MHz
1
I
S
Supply Current
8
10.5
mA
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
(Note 3)
q
0.5
3.5
mV
Input V
OS
Drift
20
V/
C
I
OS
Input Offset Current
q
100
400
nA
I
B
Input Bias Current
q
100
400
nA
CMRR
Common-Mode Rejection Ratio
V
CM
=
12V
q
92
114
dB
PSRR
Power Supply Rejection Ratio
V
S
=
5V to
15V
q
86
94
dB
A
VOL
Large-Signal Voltage Gain
V
OUT
=
10V, R
L
= 500
q
20
50
V/mV
V
OUT
Output Swing
R
L
= 500
q
12
13
V
I
OUT
Output Current
V
OUT
=
12V
q
24
26
mA
SR
Slew Rate
(Note 4)
q
180
250
V/
s
I
S
Supply Current
q
8
11
mA
V
S
=
15V, 0
C
T
A
70
C, V
CM
= 0V, unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
OS
Input Offset Voltage
(Note 3)
q
0.5
4
mV
Input V
OS
Drift
20
V/
C
I
OS
Input Offset Current
q
100
800
nA
I
B
Input Bias Current
q
100
1000
nA
CMRR
Common-Mode Rejection Ratio
V
CM
=
12V
q
92
114
dB
PSRR
Power Supply Rejection Ratio
V
S
=
5V to
15V
q
82
94
dB
A
VOL
Large-Signal Voltage Gain
V
OUT
=
10V, R
L
= 500
q
5
50
V/mV
V
OUT
Output Swing
R
L
= 500
q
10
13
V
R
L
= 1k
q
12
13
V
I
OUT
Output Current
V
OUT
=
10V
q
20
26
mA
V
OUT
=
12V
q
12
13
mA
SR
Slew Rate
(Note 4)
q
130
250
V/
s
I
S
Supply Current
q
8
11
mA
V
S
=
15V, 55
C
T
A
125
C, V
CM
= 0V, unless otherwise specified.
The
q
denotes specifications which apply over the full temperature range.
Note 1: A heat sink may be required when the output is shorted indefinitely.
Note 2: Commercial parts are designed to operate over 40
C to 85
C, but
are not tested nor guaranteed beyond 0
C to 70
C. Industrial grade parts
specified and tested over 40
C to 85
C are available on special request.
Consut factory.
Note 3: Input offset voltage is pulse tested and is exclusive of warm-up drift.
Note 4: Slew rate is measured between
10V on an output swing of
12V.
Note 5: FPBW = SR/2
V
P
.
Note 6: Differential Gain and Phase are tested in A
V
= 2 with five amps in
series. Attenuators of 1/2 are used as loads (75
, 75
and 499
, 499
).
4
LT1220
TYPICAL PERFOR
M
A
N
CE CHARACTERISTICS
U
W
SUPPLY VOLTAGE (V)
0
0
MAGNITUDE OF INPUT VOLTAGE (V)
5
10
15
20
5
10
15
20
LT1220 TPC01
T
A
= 25C
V
OS
= 0.5mV
+V
CM
V
CM
Input Common-Mode Range
vs Supply Voltage
Output Voltage Swing
vs Resistive Load
LOAD RESISTANCE (
)
10
0
OUTPUT VOLTAGE SWING (V
P-P
)
10
20
25
30
100
1k
10k
LT1220 TPC04
5
15
5V SUPPLIES
15V SUPPLIES
T
A
= 25C
V
OS
= 30mV
Output Short-Circuit Current
vs Temperature
TEMPERATURE (C)
50
20
OUTPUT SHORT-CIRCUIT CURRENT (mA)
30
35
45
50
25
50
100
125
LT1220 TPC07
25
40
0
25
75
V
S
= 5V
Power Supply Rejection Ratio
vs Frequency
FREQUENCY (Hz)
100
0
POWER SUPPLY REJECTION RATIO (dB)
20
60
100
1k
100k
1M
100M
LT1220 TPC09
40
80
10k
10M
+PSRR
V
S
= 15V
T
A
= 25C
PSRR
Input Noise Spectral Density
FREQUENCY (Hz)
10
0
INPUT VOLTAGE NOISE (nV/ Hz)
40
80
120
160
100
1k
10k
100k
LT1220 TPC08
20
60
100
140
V
S
= 15V
T
A
= 25C
A
V
= 100
Open-Loop Gain
vs Resistive Load
LOAD RESISTANCE (
)
10
60
OPEN-LOOP GAIN (dB)
80
100
110
100
1k
10k
LT1220 TPC06
70
90
T
A
= 25C
V
S
= 15V
V
S
= 5V
0
0
MAGNITUDE OF OUTPUT VOLATGE (V)
5
10
15
20
5
10
15
20
LT1220 TPC03
+V
SW
V
SW
SUPPLY VOLTAGE (V)
T
A
= 25C
R
L
= 500
V
OS
= 30mV
Output Voltage Swing
vs Supply Voltage
SUPPLY VOLTAGE (V)
0
7.0
SUPPLY CURRENT (mA) 7.5
8.0
8.5
9.0
5
10
15
20
LT1220 TPC02
T
A
= 25C
Supply Current vs Supply Voltage
and Temperature
Input Bias Current
vs Input Common-Mode Voltage
INPUT COMMON-MODE VOLTAGE (V)
15
500
INPUT BIAS CURRENT (nA)
0
500
0
5
15
LT1220 TPC05
10
5
10
400
300
200
100
100
200
300
400
I
B
+
I
B
T
A
= 25C
V
S
= 15V
5
LT1220
TYPICAL PERFOR
M
A
N
CE CHARACTERISTICS
U
W
Common-Mode Rejection Ratio
vs Frequency
Voltage Gain and Phase
vs Frequency
Total Harmonic Distortion
vs Frequency
Slew Rate vs Temperature
Closed-Loop Output Impedance
vs Frequency
Output Swing and Error
vs Settling Time (Inverting)
Output Swing and Error
vs Settling Time (Noninverting)
FREQUENCY (Hz)
1k
0
COMMON-MODE REJECTION RATIO (dB)
20
60
120
100k
1M
100M
LT1220 TPC10
40
100
10k
10M
80
V
S
= 15V
T
A
= 25C
SETTLING TIME (ns)
0
OUTPUT SWING (V)
2
6
10
100
LT1220 TPC11
2
6
0
4
8
4
8
10
25
50
75
125
10mV
10mV
1mV
1mV
SETTLING TIME (ns)
0
OUTPUT SWING (V)
2
6
10
100
LT1220 TPC12
2
6
0
4
8
4
8
10
25
50
75
125
10mV
10mV
1mV
1mV
FREQUENCY (Hz)
100
20
VOLTAGE GAIN (dB)
0
40
100
1k
100k
1M
100M
LT1220 TPC13
20
60
80
10k
10M
20
0
40
100
20
60
80
PHASE MARGIN (DEG)
V
S
= 15V
V
S
= 15V
V
S
= 5V
V
S
= 5V
T
A
= 25C
FREQUENCY (Hz)
0.1
OUTPUT IMPEDANCE (
)
1
10
100
10k
1M
10M
100M
LT1220 TPC15
0.01
100k
V
S
= 15V
T
A
= 25C
A
V
= 1
Frequency Response
vs Capacitive Load
FREQUENCY (MHz)
1
10
VOLTAGE MAGNITUDE (dB)
2
8
10
10
100
LT1220 TPC14
8
6
4
2
0
6
4
C = 100pF
C = 0
C = 50pF
C = 1000pF
C = 500pF
V
S
= 15V
T
A
= 25C
A
V
= 1
Gain-Bandwidth vs Temperature
TEMPERATURE (C)
50
38
GAIN-BANDWIDTH (MHz)
42
44
48
50
25
50
100
125
LT1220 TPC16
40
46
0
25
75
V
S
= 15V
TEMPERATURE (C)
50
150
SLEW RATE (V/
s)
200
225
275
300
25
50
100
125
LT1220 TPC24
175
250
0
25
75
+SR
SR
V
S
= 15V
A
V
= 1
R
IN
= R
F
= 1k
FREQUENCY (Hz)
10
100
0.0001
TOTAL HARMONIC DISTORTION AND NOISE (%)
0.001
0.01
1k
10k
100k
LT1220 TPC18
A
V
= 1
A
V
= 1
V
S
= 15V
V
O
= 3V
RMS
R
L
= 500
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