LT1222
500MHz, 3nV/√Hz, A
V
≥
10
Operational Amplifier
FEATURES
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■
■
■
■
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■
DESCRIPTIO
Gain-Bandwidth: 500MHz
Gain of 10 Stable Uncompensated
Slew Rate: 200V/μs
Input Noise Voltage: 3nV/√Hz
C-Load
TM
Op Amp Drives Capacitive Loads
External Compensation Pin
Maximum Input Offset Voltage: 300μV
Maximum Input Bias Current: 300nA
Maximum Input Offset Current: 300nA
Minimum Output Swing Into 500Ω:
±12V
Minimum DC Gain: 100V/mV, R
L
= 500Ω
Settling Time to 0.1%: 75ns, 10V Step
Settling Time to 0.01%: 120ns, 10V Step
Differential Gain: 0.4%, A
V
= 2, R
L
= 150Ω
Differential Phase: 0.1°, A
V
= 2, R
L
= 150Ω
The LT
®
1222 is a low noise, very high speed operational
amplifier with superior DC performance. The LT1222 is
stable in a noise gain of 10 or greater without compensa-
tion, or the part can be externally compensated for lower
closed-loop gain at the expense of lower bandwidth and
slew rate. It features reduced input offset voltage, lower
input bias currents, lower noise 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 precision 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 capacitive loads which makes it
useful in buffer or cable driver applications. The compen-
sation node can also be used to clamp the output swing.
The LT1222 is a member of a family of fast, high perfor-
mance amplifiers that employ Linear Technology
Corporation’s advanced complementary bipolar process-
ing. For unity-gain stable applications the LT1220 can be
used, and for gains of 4 or greater the LT1221 can be used.
LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
C-Load is a trademark of Linear Technology Corporation.
APPLICATIO S
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Wideband Amplifiers
Buffers
Active Filters
Video and RF Amplification
Cable Drivers
8-, 10-, 12-Bit Data Acquisition Systems
TYPICAL APPLICATIO
A
V
= 10 with Output Clamping
15V
3k
A
V
= – 1, C
C
= 30pF Pulse Response
1N5711
3
5
6
1N5711
1N4148
0.1μF
V
IN
+
–
LT1222
2
⎥
V
OUT
⎥ ≤
0.5V
909Ω
100Ω
LT1222 • TA01
R
F
= R
G
= 1k
V
S
=
±15V
V
IN
= 100mV
f = 5MHz
U
LT1222 • TA02
U
U
1222fc
1
LT1222
ABSOLUTE
AXI U
RATI GS
(Note 1)
Operating Temperature Range
LT1222C ........................................... – 40°C TO 85°C
LT1222I ...............................................–40°C to 85°C
LT1222M
(OBSOLETE) ...............
– 55°C to 125°C
Maximum Junction Temperature (See Below)
Plastic Package ............................................... 150°C
Ceramic Package
(OBSOLETE) ..................
175°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
Total Supply Voltage (V
+
to V
–
) ............................. 36V
Differential Input Voltage ........................................
±6V
Input Voltage ..........................................................
±V
S
Output Short-Circuit Duration (Note 2) ........... Indefinite
Specified Temperature Range
LT1222C (Note 3) ................................... 0°C to 70°C
LT1222I ...............................................–40°C to 85°C
LT1222M
(OBSOLETE) ...............
– 55°C to 125°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
NULL
8
NULL 1
–IN 2
+IN 3
7
V
+
6 V
OUT
5 COMP
4
ORDER PART
NUMBER
SPECIAL
ORDER
CONSULT
FACTORY
V
–
H PACKAGE
8-LEAD TO-5 METAL CAN
T
JMAX
= 175°C,
θ
JA
= 150°C/W
OBSOLETE PACKAGE
Consider the N8 or S8 Packages for Alternate Source
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
T
A
= 25°C, V
S
=
±15V,
V
CM
= 0V, unless otherwise specified.
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 (Positive)
Input Voltage Range (Negative)
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Output Swing
Output Current
Slew Rate
Full Power Bandwidth
Gain-Bandwidth
CONDITIONS
(Note 4)
MIN
TYP
100
100
100
3
2
45
12
2
14
– 13
120
110
200
13
26
200
3.2
500
MAX
300
300
300
UNITS
μV
nA
nA
nV/√Hz
pA/√Hz
MΩ
kΩ
pF
V
V
dB
dB
V/mV
±V
mA
V/μs
MHz
MHz
1222fc
f = 10kHz
f = 10kHz
V
CM
=
±12V
Differential
CMRR
PSRR
A
VOL
V
OUT
I
OUT
SR
GBW
V
CM
=
±12V
V
S
=
±5V
to
±15V
V
OUT
=
±10V,
R
L
= 500Ω
R
L
= 500Ω
V
OUT
=
±12V
(Note 5)
10V Peak (Note 6)
f = 1MHz
2
U
U
W
W W
U
W
TOP VIEW
NULL 1
–IN 2
+IN 3
V
–
4
8
7
6
5
NULL
V
+
V
OUT
COMP
S8 PACKAGE
N8 PACKAGE
8-LEAD PLASTIC DIP 8-LEAD PLASTIC SOIC
T
JMAX
= 150°C,
θ
JA
= 130°C/W (N)
T
JMAX
= 150°C,
θ
JA
= 190°C/W (S)
J8 PACKAGE
8-LEAD CERAMIC DIP
T
JMAX
= 175°C,
θ
JA
= 100°C/W (J)
ORDER PART
NUMBER
LT1222CN8
LT1222CS8
LT1222IS8
S8 PART MARKING
1222
1222I
ORDER PART
NUMBER
LT1222MJ8
Consider the N8 or S8 Packages for Alternate Source
OBSOLETE PACKAGE
20
12
100
98
100
12
24
150
– 12
LT1222
ELECTRICAL CHARACTERISTICS
SYMBOL
t
r
, t
f
PARAMETER
Rise Time, Fall Time
Overshoot
Propagation Delay
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 specified.
MIN
TYP
2.4
43
5.2
75
120
0.40
0.15
0.10
0.01
0.1
8
MAX
UNITS
ns
%
ns
ns
ns
%
%
DEG
DEG
Ω
mA
t
s
CONDITIONS
A
V
= 10, 10% to 90%, 0.1V
A
V
= 10, 0.1V
A
V
= 10, 50% V
IN
to 50% V
OUT
, 0.1V
10V Step, 0.1%
10V Step, 0.01%
A
V
= 2, C
C
= 50pF, f = 3.58MHz, R
L
= 150Ω (Note 7)
A
V
= 10, C
C
= 0pF, f = 3.58MHz, R
L
= 1k (Note 7)
A
V
= 2, C
C
= 50pF, f = 3.58MHz, R
L
= 150Ω (Note 7)
A
V
= 10, C
C
= 0pF, f = 3.58MHz, R
L
= 1k (Note 7)
A
V
= 10, f = 1MHz
10.5
The
●
denotes the specifications which apply over the temperature range 0°C
≤
T
A
≤
70°C, otherwise specifications are at T
A
= 25°C.
V
S
=
±15V,
V
CM
= 0V, unless otherwise specified.
SYMBOL
V
OS
I
OS
I
B
CMRR
PSRR
A
VOL
V
OUT
I
OUT
SR
I
S
PARAMETER
Input Offset Voltage
Input V
OS
Drift
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
(Note 4)
MIN
●
●
●
●
V
CM
=
±12V
V
S
=
±5V
to
±15V
V
OUT
=
±10V,
R
L
= 500Ω
R
L
= 500Ω
V
OUT
=
±12V
(Note 5)
●
●
●
●
●
●
●
100
98
100
12
24
150
TYP
100
5
100
100
120
110
200
13
26
200
8
MAX
600
400
400
11
UNITS
μV
μV/°C
nA
nA
dB
dB
V/mV
±V
mA
V/μs
mA
The
●
denotes the specifications which apply over the temperature range – 55°C
≤
T
A
≤
125°C for LT1222M, –40°C
≤
T
A
≤
85°C for
LT1222I, otherwise specifications are at T
A
= 25°C. V
S
=
±15V,
V
CM
= 0V, unless otherwise specified.
SYMBOL
V
OS
I
OS
I
B
CMRR
PSRR
A
VOL
V
OUT
I
OUT
SR
I
S
PARAMETER
Input Offset Voltage
Input V
OS
Drift
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
(Note 4)
MIN
●
●
●
●
V
CM
=
±12V
V
S
=
±5V
to
±15V
V
OUT
=
±10V,
R
L
= 500Ω
R
L
= 500Ω
R
L
= 1k
V
OUT
=
±10V
V
OUT
=
±12V
(Note 5)
●
●
●
●
●
●
●
●
●
98
98
50
10
12
20
12
110
TYP
100
5
100
100
120
110
200
13
13
26
13
200
8
MAX
600
800
1000
11
UNITS
μV
μV/°C
nA
nA
dB
dB
V/mV
±V
±V
mA
mA
V/μs
mA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings may
cause permanent damage to the device. Exposure to any Absolute Maximum
Rating condition for extended periods may affect device reliability and lifetime.
Note 2:
A heat sink may be required when the output is shorted indefinitely.
Note 3:
The LT1222C is guaranteed to meet specified performance from 0°C
to 70°C and is designed, characterized and expected to meet these extended
temperature limits, but is not tested at –40°C and 85°C. The LT1222I is
guaranteed to meet the extended temperature limits.
Note 4:
Input offset voltage is pulse tested and is exclusive of warm-up drift.
Note 5:
Slew rate is measured between
±10V
on an output swing of
±12V.
Note 6:
FPBW = SR/2πV
P
.
Note 7:
Differential Gain and Phase are tested with five amps in series.
Attenuators of 1/Gain are used as loads.
1222fc
3
LT1222
TYPICAL PERFORMANCE CHARACTERISTICS
Input Common Mode Range
vs Supply Voltage
20
11
10
+V
CM
10
–V
CM
5
SUPPLY CURRENT (mA)
15
MAGNITUDE OF OUTPUT VOLATGE (V)
MAGNITUDE OF INPUT VOLTAGE (V)
T
A
= 25°C
ΔV
OS
= 0.5mV
0
0
5
10
15
SUPPLY VOLTAGE (±V)
20
Output Voltage Swing
vs Resistive Load
30
OUTPUT VOLTAGE SWING (V
P-P
)
25
20
15
10
5
0
T
A
= 25°C
ΔV
OS
= 30mV
INPUT BIAS CURRENT (nA)
OPEN-LOOP GAIN (dB)
±15V SUPPLIES
± 5V SUPPLIES
10
100
1k
LOAD RESISTANCE (Ω)
Output Short-Circuit Current
vs Temperature
50
OUTPUT SHORT-CIRCUIT CURRENT (mA)
V
S
= ±5V
45
40
35
30
25
20
– 50 – 25
INPUT VOLTAGE NOISE (nV/√Hz)
POWER SUPPLY REJECTION RATIO (dB)
0
25
75
50
TEMPERATURE (°C)
4
U W
LT1222 • TPC01
Supply Current vs Supply Voltage
and Temperature
20
Output Voltage Swing
vs Supply Voltage
T
A
= 25°C
R
L
= 500Ω
ΔV
OS
= 30mV
15
+V
SW
10
– V
SW
5
T = 125°C
9
8
7
6
5
0
5
10
15
SUPPLY VOLTAGE (±V)
20
T = 25°C
T = – 55°C
0
0
5
10
15
SUPPLY VOLTAGE (±V)
20
LT1222 • TPC02
LT1222 • TPC03
Input Bias Current
vs Input Common Mode Voltage
500
400
300
200
100
0
–100
– 200
– 300
–400
I
B+
I
B–
V
S
=
±15V
T
A
= 25°C
Open-Loop Gain
vs Resistive Load
120
T
A
= 25°C
110
V
S
= ±15V
100
V
S
= ±5V
90
80
10k
LT1222 • TPC04
–500
–15
0
5
–10
–5
10
INPUT COMMON MODE VOLTAGE (V)
15
70
10
100
1k
LOAD RESISTANCE (Ω)
10k
LT1222 • TPC06
LT1222 • TPC05
Input Noise Spectral Density
1000
V
S
= ±15V
T
A
= 25°C
A
V
= 101
R
S
= 100k
100
i
n
10
100
INPUT CURRENT NOISE (pA/√Hz)
120
100
Power Supply Rejection Ratio
vs Frequency
V
S
= ±15V
T
A
= 25°C
+PSRR
80
–PSRR
60
40
20
0
100
10
1
e
n
1
10
100
1k
10k
FREQUENCY (Hz)
0.1
100k
100
125
1k
10k 100k
1M
FREQUENCY (Hz)
10M
100M
LT1222 • TPC07
LT1222 • TPC08
LT1222 • TPC09
1222fc
LT1222
TYPICAL PERFORMANCE CHARACTERISTICS
Common Mode Rejection Ratio
vs Frequency
120
COMMON MODE REJECTION RATIO (dB)
10
100
80
60
40
20
0
1k
10k
1M
100k
FREQUENCY (Hz)
V
S
=
±15V
T
A
= 25°C
OUTPUT SWING (V)
OUTPUT SWING (V)
Voltage Gain and Phase
vs Frequency
120
V
S
= ±15V
100
VOLTAGE MAGNITUDE (dB)
OUTPUT IMPEDANCE (Ω)
V
S
= ±15V
V
S
= ±5V
V
S
= ±5V
VOLTAGE GAIN (dB)
80
60
40
20
T
A
= 25°C
0
100k
100
10k
1M
1k
FREQUENCY (Hz)
Gain-Bandwidth vs Temperature
550
V
S
= ±15V
525
275
250
TOTAL HARMONIC DISTORTION AND NOISE (%)
GAIN-BANDWIDTH (MHz)
500
475
450
425
400
– 50 – 25
SLEW RATE (V/μs)
0
75
25
50
TEMPERATURE (°C)
U W
10M
LT1222 • TPC10
Output Swing and Error
vs Settling Time (Noninverting)
10
V
S
= ±15V
T
A
= 25°C
10mV
1mV
8
6
4
2
0
–2
–4
–6
–8
–10
10mV
1mV
Output Swing and Error
vs Settling Time (Inverting)
8
6
4
2
0
–2
–4
–6
–8
10mV
1mV
V
S
= ±15V
T
A
= 25°C
10mV
1mV
100M
0
25
75
100
50
SETTLING TIME (ns)
–10
125
0
25
75
100
50
SETTLING TIME (ns)
125
LT1222 • TPC11
LT1222 • TPC12
Frequency Response
vs Capacitive Load
100
80
30
28
26
24
22
20
18
16
14
12
10M
– 20
100M
10
1
10
FREQUENCY (MHz)
100
LT1222 • TPC14
Closed-Loop Output Impedance
vs Frequency
10
V
S
= ±15V
T
A
= 25°C
A
V
= 10
1
V
S
= ±15V
T
A
= 25°C
A
V
= –10
C = 100pF
C = 50pF
PHASE MARGIN (DEG)
60
40
20
0
C=0
C = 500pF
C = 1000pF
0.1
0.01
0.001
10k
100k
1M
10M
FREQUENCY (Hz)
100M
LT1222 • TPC15
LT1222 • TPC13
Slew Rate vs Temperature
0.01
V
S
= ±15V
A
V
= –10
C
C
= 0
(SR
+
) + (SR
–
)
SR =
2
Total Harmonic Distortion
vs Frequency
V
S
= ±15V
V
O
= 3V
RMS
R
L
= 500Ω
225
200
175
150
0.001
A
V
= ±10
100
125
125
– 50 – 25
0
25
50
75
TEMPERATURE (°C)
100
125
0.0001
10
100
1k
10k
FREQUENCY (Hz)
100k
LT1222 • TPC18
LT1222 • TPC16
LT1222 • TPC17
1222fc
5
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