LT1221
150MHz, 250V/µs, A
V
≥
4
Operational Amplifier
FEATURES
s
s
s
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
Gain-Bandwidth: 150MHz
Gain of 4 Stable
Slew Rate: 250V/µs
Input Noise Voltage: 6nV/√Hz
C-Load
TM
Op Amp Drives Capacitive Loads
Maximum Input Offset Voltage: 600µV
Maximum Input Bias Current: 300nA
Maximum Input Offset Current: 300nA
Minimum Output Swing Into 500Ω:
±12V
Minimum DC Gain: 50V/mV, R
L
= 500Ω
Settling Time to 0.1%: 65ns, 10V Step
Settling Time to 0.01%: 85ns, 10V Step
Differential Gain: 0.08%, A
V
= 4, R
L
= 150Ω
Differential Phase: 0.2°, A
V
= 4, R
L
= 150Ω
The LT1221 is a very high speed operational amplifier with
superior DC performance. The LT1221 is stable in a noise
gain of 4 or greater. It 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 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 LT1221 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 10 or greater the LT1222 can be used.
and LTC are registered trademarks and LT is a trademark of Linear Technology Corporation.
C-Load is a trademark of Linear Technology Cortporation.
APPLICATI
s
s
s
s
s
s
S
Wideband Amplifiers
Buffers
Active Filters
Video and RF Amplification
Cable Drivers
8-, 10-, 12-Bit Data Acquisition Systems
TYPICAL APPLICATION
Summing Amplifier
1k
V
A
V
B
V
C
1k
1k
Summing Amplifier Large-Signal Response
–
LT1221
V
OUT
1k
+
LT1221 • TA01
V
S
=
±15V
V
IN
= 10V
P-P
f = 2MHz
U
LT1221 • TA02
U
UO
1
LT1221
ABSOLUTE
AXI U
RATI GS
Operating Temperature Range
LT1221C ........................................... – 40°C TO 85°C
LT1221M ......................................... – 55°C to 125°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
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
LT1221C (Note 2) ................................... 0°C to 70°C
LT1221M ......................................... – 55°C to 125°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
NULL
8
NULL 1
–IN 2
+IN 3
7 V
+
ORDER PART
NUMBER
SPECIAL
ORDER
CONSULT
FACTORY
6 V
OUT
5 NC
4
V
–
H PACKAGE
8-LEAD TO-5 METAL CAN
T
JMAX
= 175°C,
θ
JA
= 150°C/W
Consult factory for Industrial grade parts.
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
Inut 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
V
S
=
±15V,
T
A
= 25°C, V
CM
= 0V, unless otherwise specified.
MIN
TYP
200
100
100
6
2
45
80
2
14
– 13
114
110
100
13
26
250
4
150
MAX
600
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
CONDITIONS
(Note 3)
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 4)
10V Peak (Note 5)
f = 1MHz
2
U
U
W
W W
U
W
TOP VIEW
NULL 1
–IN 2
+IN 3
V
–
4
J8 PACKAGE
8-LEAD CERAMIC DIP
8
7
6
5
NULL
V
+
V
OUT
NC
ORDER PART
NUMBER
LT1221CN8
LT1221MJ8
LT1221CS8
S8 PART MARKING
1221
N8 PACKAGE
8-LEAD PLASTIC DIP
S8 PACKAGE
8-LEAD PLASTIC SOIC
T
JMAX
= 175°C,
θ
JA
= 100°C/W (J)
T
JMAX
= 150°C,
θ
JA
= 130°C/W (N)
T
JMAX
= 150°C,
θ
JA
= 190°C/W (S)
20
12
92
90
50
12
24
200
– 12
LT1221
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
3.2
10
5.4
65
85
0.08
0.02
0.20
0.05
0.3
8
MAX
UNITS
ns
%
ns
ns
ns
%
%
DEG
DEG
Ω
mA
t
s
CONDITIONS
A
V
= 4, 10% to 90%, 0.1V
A
V
= 4, 0.1V
A
V
= 4, 50% V
IN
to 50% V
OUT
, 0.1V
10V Step, 0.1%
10V Step, 0.01%
f = 3.58MHz, R
L
= 150Ω (Note 6)
f = 3.58MHz, R
L
= 1k (Note 6)
f = 3.58MHz, R
L
= 150Ω (Note 6)
f = 3.58MHz, R
L
= 1k (Note 6)
A
V
= 4, f = 1MHz
10.5
V
S
=
±15V,
0°C
≤
T
A
≤
70°C, 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 3)
MIN
q
q
q
V
CM
=
±12V
V
S
=
±5V
to
±15V
V
OUT
=
±10V,
R
L
= 500Ω
R
L
= 500Ω
V
OUT
=
±12V
(Note 4)
q
q
q
q
q
q
q
92
90
40
12
24
180
TYP
0.2
15
100
100
114
110
100
13
26
250
8
MAX
1.5
400
400
11
UNITS
mV
µV/°C
nA
nA
dB
dB
V/mV
±V
mA
V/µs
mA
V
S
=
±15V,
– 55°C
≤
T
A
≤
125°C, 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 3)
MIN
q
q
q
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 4)
q
q
q
q
q
q
q
q
q
92
90
12.5
10
12
20
12
130
TYP
0.2
15
100
100
114
110
100
13
13
26
13
250
8
MAX
2
800
1000
11
UNITS
mV
µV/°C
nA
nA
dB
dB
V/mV
±V
±V
mA
mA
V/µs
mA
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.
Consult 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/2πV
P
.
Note 6:
Differential Gain and Phase are tested in A
V
= 4 with five amps in
series. Attenuators of 1/4 are used as loads (36.5Ω, 110Ω and
249Ω, 750Ω).
3
LT1221
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
∆V
OS
= 0.5mV
0
0
5
10
15
SUPPLY VOLTAGE (±V)
20
Output Voltage Swing
vs Resistive Load
30
500
T
A
= 25°C
∆V
OS
= 30mV
400
OUTPUT VOLTAGE SWING (V
P-P
)
25
20
INPUT BIAS CURRENT (nA)
OPEN-LOOP GAIN (dB)
±15V SUPPLIES
15
10
±5V SUPPLIES
5
0
10
100
1k
LOAD RESISTANCE (Ω)
10k
LT1221 • TPC04
Output Short-Circuit Current
vs Temperature
50
OUTPUT SHORT-CIRCUIT CURRENT (mA)
POWER SUPPLY REJECTION RATIO (dB)
V
S
= ±5V
45
40
35
30
25
20
–50
INPUT NOISE VOLTAGE (nV/√Hz)
–25
50
0
25
75
TEMPERATURE (°C)
4
U W
LT1221 • TPC01
Supply Current vs Supply Voltage
and Temperature
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 = 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
LT1221 • TPC02
LT1221 • TPC03
Input Bias Current
vs Input Common-Mode Voltage
T
A
= 25°C
V
S
= ±15V
110
Open-Loop Gain
vs Resistive Load
T
A
= 25°C
100
300
200
100
0
–100
–200
–300
– 400
– 500
–15
I
B+
I
B–
V
S
= ±15V
90
V
S
= ±5V
80
70
60
0
5
–10
–5
10
INPUT COMMON-MODE VOLTAGE (V)
15
10
100
1k
LOAD RESISTANCE (Ω)
10k
LT1221 • TPC06
LT1221 • TPC05
Input Noise Spectral Density
1000
V
S
= ±15V
T
A
= 25°C
A
V
= 101
R
S
= 100k
100
i
n
10
100
100
Power Supply Rejection Ratio
vs Frequency
+PSRR
80
60
–PSRR
40
20
10
0
100
V
S
= ±15V
T
A
= 25°C
INPUT NOISE CURRENT (pA/√Hz)
10
e
n
1
1
100
125
10
100
1k
10k
FREQUENCY (Hz)
0.1
100k
1k
10k 100k
1M
FREQUENCY (Hz)
10M
100M
LT1221 • TPC07
LT1221 • TPC08
LT1221 • TPC09
LT1221
TYPICAL PERFORMANCE CHARACTERISTICS
Common-Mode Rejection Ratio
vs Frequency
120
COMMON-MODE REJECTION RATIO (dB)
100
80
60
40
20
0
1k
10k
1M
100k
FREQUENCY (Hz)
V
S
= ±15V
T
A
= 25°C
OUTPUT SWING (V)
2
0
–2
–4
–6
–8
10mV
1mV
OUTPUT SWING (V)
Voltage Gain and Phase
vs Frequency
100
V
S
= ±15V
80
80
VOLTAGE MAGNITUDE (dB)
100
24
22
20
18
16
14
12
10
8
6
10k
1M
100k
FREQUENCY (Hz)
10M
–20
100M
4
OUTPUT IMPEDANCE (Ω)
VOLTAGE GAIN (dB)
60
V
S
= ±15V
40
20
0
T
A
= 25°C
–20
100
1k
V
S
= ±5V
V
S
= ±5V
Gain-Bandwidth vs Temperature
180
V
S
= ±15V
170
325
300
TOTAL HARMONIC DISTORTION AND NOISE (%)
GAIN-BANDWIDTH (MHz)
160
150
140
130
120
– 50 – 25
SLEW RATE (V/µs)
0
75
25
50
TEMPERATURE (°C)
U W
10M
LT1221 • TPC10
LT1221 • TPC13
Output Swing and Error
vs Settling Time (Noninverting)
10
8
6
4
10mV
1mV
V
S
= ±15V
T
A
= 25°C
10
8
6
4
2
0
–2
–4
–6
–8
0
25
75
100
50
SETTLING TIME (ns)
125
–10
Output Swing and Error
vs Settling Time (Inverting)
V
S
= ±15V
T
A
= 25°C
10mV
1mV
10mV
1mV
100M
–10
0
25
75
100
50
SETTLING TIME (ns)
125
LT1220 • TPC11
LT1221 • TPC12
Frequency Response
vs Capacitive Load
10
V
S
= ±15V
T
A
= 25°C
A
V
= – 5
C = 100pF
C = 50pF
Closed-Loop Output Impedance
vs Frequency
V
S
= ±15V
T
A
= 25°C
A
V
= 4
1
PHASE MARGIN (DEG)
60
40
20
0
0.1
C = 500pF
C = 1000pF
1
10
FREQUENCY (MHz)
C=0
0.01
100
LT1221 • TPC14
0.001
10k
100k
1M
10M
FREQUENCY (Hz)
100M
LT1221 • TPC15
Slew Rate vs Temperature
0.01
Total Harmonic Distortion
vs Frequency
V
S
= ±15V
V
O
= 3V
RMS
R
L
= 500Ω
V
S
= ±15V
A
V
= – 5
(SR
+
) + (SR
–
)
SR =
2
A
V
= 4
A
V
= –4
275
250
225
200
175
– 50 –25
0.001
100
125
0
25
50
75
TEMPERATURE (°C)
100
125
0.0001
10
100
1k
10k
FREQUENCY (Hz)
100k
LT1220 • TPC18
LT1221 • TPC16
LT1221 • TPC19
5
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