LT1221CS8#PBF [Linear]
LT1221 - 150MHz, 250V/µs, AV >/=4 Operational Amplifier; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C;
| 型号： | LT1221CS8#PBF |
| 厂家： | 
Linear |
| 描述： | LT1221 - 150MHz, 250V/µs, AV >/=4 Operational Amplifier; Package: SO; Pins: 8; Temperature Range: 0°C to 70°C 运算放大器 光电二极管 |
| 文件： | 总12页 (文件大小：246K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1221
150MHz, 250V/µs, AV ≥ 4
Operational Amplifier
U
DESCRIPTIO
FEATURES
The LT®1221 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. Thehighgainandfastsettlingtimemakethecircuit
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.
■
Gain-Bandwidth: 150MHz
■
Gain of 4 Stable
■
Slew Rate: 250V/µs
■
Input Noise Voltage: 6nV/√Hz
C-LoadTM 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, RL = 500Ω
■
Settling Time to 0.1%: 65ns, 10V Step
■
Settling Time to 0.01%: 85ns, 10V Step
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,andforgainsof10orgreatertheLT1222canbeused.
■
Differential Gain: 0.08%, AV = 4, RL = 150Ω
■
Differential Phase: 0.2°, AV = 4, RL = 150Ω
U
APPLICATIO S
■
Wideband Amplifiers
, LTC and LT are registered trademarks of Linear Technology Corporation
C-Load is a trademark of Linear Technology Corporation
■
Buffers
■
Active Filters
■
Video and RF Amplification
■
Cable Drivers
■
8-, 10-, 12-Bit Data Acquisition Systems
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TYPICAL APPLICATIO
Summing Amplifier Large-Signal Response
Summing Amplifier
1k
1k
1k
1k
V
V
A
B
–
+
V
LT1221
OUT
V
C
LT1221 • TA01
LT1221 • TA02
f = 2MHz
VS = ±15V
VIN = 10VP-P
1
LT1221
W W W
U
(Note 1)
ABSOLUTE AXI U RATI GS
Total Supply Voltage (V+ to V–) ............................. 36V
Differential Input Voltage ........................................ ±6V
Input Voltage .......................................................... ±VS
Output Short-Circuit Duration (Note 2)........... Indefinite
Specified Temperature Range
Operating Temperature Range
LT1221C........................................... –40°C TO 85°C
LT1221M (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
LT1221C (Note 3)................................... 0°C to 70°C
LT1221M (OBSOLETE) ............... –55°C to 125°C
W
U
/O
TOP VIEW
NULL
PACKAGE RDER I FOR ATIO
TOP VIEW
ORDER PART
NUMBER
ORDER PART
NUMBER
NULL
–IN
1
2
3
4
NULL
8
7
6
5
8
+
V
+
1
3
V
NULL
–IN
+IN
7
5
LT1221CN8
LT1221CS8
SPECIAL
ORDER
CONSULT
FACTORY
+IN
V
OUT
6
2
V
OUT
–
V
NC
S8 PART MARKING
1221
NC
S8 PACKAGE
N8 PACKAGE
4
8-LEAD PLASTIC SOIC
8-LEAD PLASTIC DIP
–
V
TJMAX = 150°C, θJA = 130°C/W (N)
JMAX = 150°C, θJA = 190°C/W (S)
J8 PACKAGE
8-LEAD CERAMIC DIP
TJMAX = 175°C, θJA = 100°C/W (J)
H PACKAGE
8-LEAD TO-5 METAL CAN
TJMAX = 175°C, θJA = 150°C/W
T
ORDER PART
NUMBER
LT1221MJ8
OBSOLETE PACKAGE
OBSOLETE PACKAGE
Consider the N8 or S8 Package for Alternate Source
Consider the N8 Package for Alternate Source
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS TA = 25°C, VS = ±15V, TA = 25°C, VCM = 0V, unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
200
100
100
6
MAX
600
300
300
UNITS
µV
V
OS
Input Offset Voltage
Input Offset Current
Input Bias Current
Input Noise Voltage
Input Noise Current
Input Resistance
(Note 4)
I
I
nA
OS
nA
B
e
n
f = 10kHz
f = 10kHz
nV/√Hz
pA/√Hz
i
n
2
R
IN
V
= ±12V
CM
20
12
45
80
MΩ
kΩ
Differential
C
IN
Input Capacitance
2
pF
Input Voltage Range (Positive)
Input Voltage Range (Negative)
14
–13
V
V
–12
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Output Swing
V
= ±12V
92
90
114
110
100
13
dB
dB
CM
V = ±5V to ±15V
S
A
V
V
= ±10V, R = 500Ω
50
V/mV
±V
VOL
OUT
OUT
OUT
L
R = 500Ω
12
L
I
Output Current
V
= ±12V
24
26
mA
OUT
SR
Slew Rate
(Note 5)
200
250
4
V/µs
MHz
MHz
Full Power Bandwidth
Gain-Bandwidth
10V Peak (Note 6)
f = 1MHz
GBW
150
2
LT1221
VS = ±15V, TA = 25°C, VCM = 0V, unless otherwise specified.
ELECTRICAL CHARACTERISTICS
SYMBOL
t , t
PARAMETER
CONDITIONS
A = 4, 10% to 90%, 0.1V
MIN
TYP
3.2
10
MAX
UNITS
ns
Rise Time, Fall Time
Overshoot
r
f
V
A = 4, 0.1V
%
V
Propagation Delay
Settling Time
A = 4, 50% V to 50% V , 0.1V
5.4
ns
V
IN
OUT
t
10V Step, 0.1%
10V Step, 0.01%
65
85
ns
ns
s
Differential Gain
Differential Phase
f = 3.58MHz, R = 150Ω (Note 7)
0.08
0.02
%
%
L
f = 3.58MHz, R = 1k (Note 7)
L
f = 3.58MHz, R = 150Ω (Note 7)
0.20
0.05
DEG
DEG
L
f = 3.58MHz, R = 1k (Note 7)
L
R
Output Resistance
Supply Current
A = 4, f = 1MHz
V
0.3
8
Ω
O
I
10.5
mA
S
The ● denotes the specifications which apply over the temperature range 0°C ≤ TA ≤ 70°C, otherwise specifications are at TA = 25°C.
VS = ±15V, VCM = 0V, unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
0.2
15
MAX
UNITS
mV
V
Input Offset Voltage
(Note 4)
●
●
●
●
●
●
●
●
●
●
●
1.5
OS
Input V Drift
µV/°C
nA
OS
I
I
Input Offset Current
Input Bias Current
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Output Swing
100
100
114
110
100
13
400
400
OS
nA
B
CMRR
PSRR
V
= ±12V
92
90
dB
CM
V = ±5V to ±15V
S
dB
A
V
V
= ±10V, R = 500Ω
40
V/mV
±V
VOL
OUT
OUT
OUT
L
R = 500Ω
L
12
I
Output Current
V
= ±12V
24
26
mA
OUT
SR
Slew Rate
(Note 5)
180
250
8
V/µs
mA
I
Supply Current
11
S
The ● denotes the specifications which apply over the temperature range –55°C ≤ TA ≤ 125°C, otherwise specifications are at
TA = 25°C. VS = ±15V, VCM = 0V, unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
0.2
MAX
UNITS
mV
V
Input Offset Voltage
(Note 4)
●
●
●
●
●
●
●
2
OS
Input V Drift
15
µV/°C
nA
OS
I
I
Input Offset Current
100
100
114
110
100
800
OS
Input Bias Current
1000
nA
B
CMRR
PSRR
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Output Swing
V
= ±12V
92
90
dB
CM
V = ±5V to ±15V
S
dB
A
V
V
= ±10V, R = 500Ω
12.5
V/mV
VOL
OUT
OUT
L
R = 500Ω
●
●
10
12
13
13
±V
±V
L
R = 1k
L
I
Output Current
V
V
= ±10V
= ±12V
●
●
20
12
26
13
mA
mA
OUT
OUT
OUT
SR
Slew Rate
(Note 5)
●
●
130
250
8
V/µs
I
Supply Current
11
mA
S
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
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 2: A heat sink may be required when the output is shorted indefinitely.
Note 6: FPBW = SR/2πV .
P
Note 3: 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 7: Differential Gain and Phase are tested in A = 4 with five amps in
series. Attenuators of 1/4 are used as loads (36.5Ω, 110Ω and
249Ω, 750Ω).
V
3
LT1221
TYPICAL PERFORMANCE CHARACTERISTICS
W
U
Input Common Mode Range
vs Supply Voltage
Supply Current vs Supply Voltage
and Temperature
Output Voltage Swing
vs Supply Voltage
11
10
20
15
10
5
20
15
10
5
T
= 25°C
T
= 25°C
OS
A
A
R
= 500Ω
L
∆V = 0.5mV
∆V = 30mV
OS
T = 125°C
T = 25°C
+V
–V
9
8
CM
+V
–V
SW
CM
SW
7
6
5
T = –55°C
0
0
0
5
10
15
20
0
5
10
15
20
0
5
10
15
20
SUPPLY VOLTAGE ( Vꢀ
SUPPLY VOLTAGE ( Vꢀ
SUPPLY VOLTAGE (±V)
LT1221 • TPC02
LT1221 • TPC03
LT1221 • TPC01
Output Voltage Swing
vs Resistive Load
Input Bias Current
vs Input Common Mode Voltage
Open-Loop Gain
vs Resistive Load
500
400
300
200
100
0
110
100
30
25
T
= 25°C
= ±15V
S
T
= 25°C
T
= 25°C
A
A
A
V
∆V = 30mV
OS
V
= 15V
S
+
20
15
10
5
I
B
90
80
70
60
15V SUPPLIES
–
I
B
V
= 5V
S
–100
–200
–300
5V SUPPLIES
–400
–500
0
10
100
1k
10k
–15 –10
–5
0
5
10
15
10
100
1k
10k
LOAD RESISTANCE (Ωꢀ
LOAD RESISTANCE (Ωꢀ
INPUT COMMON MODE VOLTAGE (V)
LT1221 • TPC04
LT1221 • TPC05
LT1221 • TPC06
Output Short-Circuit Current
vs Temperature
Power Supply Rejection Ratio
vs Frequency
Input Noise Spectral Density
1000
100
100
10
100
80
50
45
40
35
30
25
20
V
= 5V
S
V
=
15V
V
T
=
15V
S
A
V
+PSRR
S
A
T
= 25°C
= 101
= 25°C
A
R
= 100k
S
60
40
i
n
–PSRR
10
1
1
20
10
0
e
n
0.1
100k
10
100
1k
10k
100
1k
10k 100k
1M
10M 100M
–50 –25
0
25
50
75 100 125
FREQUENCY (Hzꢀ
FREQUENCY (Hzꢀ
TEMPERATURE (°Cꢀ
LT1221 • TPC08
LT1221 • TPC09
LT1221 • TPC07
4
LT1221
W
U
TYPICAL PERFORMANCE CHARACTERISTICS
Common Mode Rejection Ratio
vs Frequency
Output Swing and Error
Output Swing and Error
vs Settling Time (Inverting)
vs Settling Time (Noninverting)
10
8
10
8
120
100
V
T
=
15V
V
T
=
15V
S
S
V
= ±15V
= 25°C
S
= 25°C
= 25°C
A
A
T
A
6
4
6
4
10mV
1mV
10mV
1mV
80
60
2
0
2
0
–2
–4
–2
–4
40
20
0
10mV
1mV
10mV
1mV
–6
–8
–6
–8
–10
–10
0
25
50
75
100
125
0
25
50
75
100
125
1k
100k
1M
10M
100M
10k
SETTLING TIME (nsꢀ
SETTLING TIME (nsꢀ
FREQUENCY (Hz)
LT1220 • TPC11
LT1221 • TPC12
LT1221 • TPC10
Voltage Gain and Phase
vs Frequency
Frequency Response
vs Capacitive Load
Closed-Loop Output Impedance
vs Frequency
100
80
100
80
24
22
20
18
10
1
V
=
15V
V
=
15V
V
=
15V
S
A
V
S
S
A
V
T
= 25°C
= 4
T
= 25°C
= –5
A
A
C = 100pF
V
= 5V
S
60
60
16
14
V
= 15V
S
C = 50pF
40
20
40
20
0
0.1
V
= 5V
S
12
10
8
C = 0
0.01
C = 500pF
C = 1000pF
0
6
T
= 25°C
1k
A
0.001
–20
–20
4
100
10k
100k
1M 10M 100M
1
10
FREQUENCY (MHzꢀ
100
10k
100k
1M
10M
100M
FREQUENCY (Hzꢀ
FREQUENCY (Hzꢀ
LT1221 • TPC15
LT1221 • TPC13
LT1221 • TPC14
Total Harmonic Distortion
vs Frequency
Gain-Bandwidth vs Temperature
Slew Rate vs Temperature
0.01
0.001
180
170
160
150
140
130
120
325
300
275
250
225
200
175
V
= 15V
V
V
=
15V
RMS
S
O
L
S
V
A
=
15V
S
V
= 3V
= –5
R
= 500Ω
+
–
A
= 4
V
(SR ꢀ + (SR ꢀ
2
SR =
A
V
= –4
0.0001
10
100
1k
10k
100k
–50 –25
0
25
50
75 100 125
–50 –25
0
25
50
75 100 125
FREQUENCY (Hzꢀ
TEMPERATURE (°Cꢀ
TEMPERATURE (°Cꢀ
LT1220 • TPC18
LT1221 • TPC16
LT1221 • TPC19
5
LT1221
TYPICAL PERFORMANCE CHARACTERISTICS
W
U
Large Signal, AV = 4,
CL = 10,000pF
Small Signal, AV = 4
Large Signal, AV = 4
LT1221 • TPC19
LT1221 • TPC20
LT1221 • TPC21
f = 5MHz
f = 2MHz
f = 20kHz
VS = ±15V
IN = 25mV
VS = ±15V
IN = 5VP-P
VS = ±15V
VIN = 5VP-P
V
V
Small Signal, AV = –4,
CL = 1,000pF
Small Signal, AV = –4
Large Signal, AV = –4
LT1221 • TPC22
LT1221 • TPC23
LT1221 • TPC24
f = 5MHz
f = 2MHz
f = 500kHz
VS = ±15V
VIN = 25mV
VS = ±15V
VIN = 5VP-P
VS = ±15V
VIN = 42mV
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W U U
APPLICATIONS INFORMATION
TheLT1221isstableinnoisegainsof4orgreaterandmay
beinserteddirectlyintoHA2520/2/5,HA2541/2/4,AD817,
AD847, EL2020, EL2044 and LM6361 applications, pro-
vided that the nulling circuitry is removed and the ampli-
fier configuration has a high enough noise gain. The
suggested nulling circuit for the LT1221 is shown in the
following figure.
Layout and Passive Components
The LT1221 amplifier is easy to apply and tolerant of less
than ideal layouts. For maximum performance (for ex-
ample, fast settling time) use a ground plane, short lead
lengthsandRF-qualitybypasscapacitors(0.01µFto0.1µF).
For high drive current applications use low ESR bypass
capacitors (1µF to 10µF tantalum). Sockets should be
avoided when maximum frequency performance is re-
quired, although low profile sockets can provide reason-
able performance up to 50MHz. For more details see
Design Note 50. Feedback resistors greater than 5k are not
recommended because a pole is formed with the input
capacitance which can cause peaking or oscillations.
Offset Nulling
+
V
5k
1
0.1µF
3
2
8
+
7
4
6
LT1221
–
Input Considerations
0.1µF
Bias current cancellation circuitry is employed on the
inputs of the LT1221 so the input bias current and input
–
LT1221 • AI01
V
6
LT1221
U
W U U
APPLICATIONS INFORMATION
offsetcurrenthaveidenticalspecifications.Forthisreason,
matching the impedance on the inputs to reduce bias
current errors is not necessary.
Compensation
The LT1221 has a typical gain-bandwidth product of
150MHz which allows it to have wide bandwidth in high
gain configurations (i.e., in a gain of 10, it will have a
bandwidth of about 15MHz). The amplifier is stable in a
noisegainof4sotheratioofthesignalattheinvertinginput
to the output must be 1/4 or less. Straightforward gain
configurations of 4 or –3 are stable, but there are several
others that allow the amplifier to be stable for lower signal
gains (the noise gain, however, remains 4 or more). One
example is the summing amplifier on the first page of this
data sheet. Each input signal has a gain of –1 to the output,
but it is easily seen that this configuration is equivalent to
a gain of –3 as far as the amplifier is concerned. Another
circuit is shown below with a DC gain of 1, but an AC gain
of 5. The break frequency of the R-C combination across
the amplifier inputs should be approximately a factor of 10
lessthanthegain-bandwidthoftheamplifierdividedbythe
high frequency gain (in this case 1/10 of 150MHz/5 or
3MHz).
Capacitive Loading
The LT1221 is stable with capacitive loads. This is accom-
plishedbysensingtheloadinducedoutputpoleandadding
compensation at the amplifier gain node. As the capacitive
load increases, both the bandwidth and phase margin
decrease. There will be peaking in the frequency domain as
shown in the curve of Frequency Response vs Capacitive
Load. The small-signal transient response will have more
overshoot as shown in the photo of the small-signal
responsewith1000pFload.Thelarge-signalresponsewith
a 10,000pF load shows the output slew rate being limited
to 4V/µs by the short-circuit current. The LT1221 can drive
coaxialcabledirectly, butforbestpulsefidelityaresistorof
value equal to the characteristic impedance of the cable
(i.e., 75Ω) should be placed in series with the output. The
other end of the cable should be terminated with the same
value resistor to ground.
W
W
SI PLIFIED SCHE ATIC
+
V
7
NULL
1
8
BIAS 1
BIAS 2
6
OUT
–IN
2
+IN
3
4
–
V
LT1221 • SS
7
LT1221
U
PACKAGE DESCRIPTIO
H Package
8-Lead TO-5 Metal Can (.200 Inch PCD)
(Reference LTC DWG # 05-08-1320)
0.335 – 0.370
(8.509 – 9.398)
DIA
0.305 – 0.335
(7.747 – 8.509)
0.040
0.050
(1.016)
MAX
0.165 – 0.185
(1.270)
MAX
(4.191 – 4.699)
REFERENCE
PLANE
SEATING
PLANE
GAUGE
PLANE
0.500 – 0.750
(12.700 – 19.050)
0.010 – 0.045*
(0.254 – 1.143)
0.016 – 0.021**
(0.406 – 0.533)
0.027 – 0.045
(0.686 – 1.143)
45°TYP
PIN 1
0.028 – 0.034
(0.711 – 0.864)
0.200
(5.080)
TYP
0.110 – 0.160
*LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE
AND 0.045" BELOW THE REFERENCE PLANE
0.016 – 0.024
**FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS
(0.406 – 0.610)
(2.794 – 4.064)
INSULATING
STANDOFF
H8(TO-5) 0.200 PCD 1197
OBSOLETE PACKAGE
8
LT1221
U
PACKAGE DESCRIPTIO
J8 Package
8-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
0.405
(10.287)
MAX
CORNER LEADS OPTION
(4 PLCS)
0.005
(0.127)
MIN
6
5
4
8
7
0.023 – 0.045
(0.584 – 1.143)
HALF LEAD
OPTION
0.025
0.220 – 0.310
(5.588 – 7.874)
0.045 – 0.068
(0.635)
RAD TYP
(1.143 – 1.727)
FULL LEAD
OPTION
1
2
3
0.200
(5.080)
MAX
0.300 BSC
(0.762 BSC)
0.015 – 0.060
(0.381 – 1.524)
0.008 – 0.018
(0.203 – 0.457)
0° – 15°
0.045 – 0.065
(1.143 – 1.651)
0.125
3.175
MIN
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE
OR TIN PLATE LEADS
0.014 – 0.026
(0.360 – 0.660)
0.100
(2.54)
BSC
J8 1298
OBSOLETE PACKAGE
9
LT1221
U
PACKAGE DESCRIPTIO
N8 Package
8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
0.400*
(10.160)
MAX
8
7
6
5
4
0.255 ± 0.015*
(6.477 ± 0.381)
1
2
3
0.130 ± 0.005
0.300 – 0.325
0.045 – 0.065
(3.302 ± 0.127)
(1.143 – 1.651)
(7.620 – 8.255)
0.065
(1.651)
TYP
0.009 – 0.015
(0.229 – 0.381)
0.125
0.020
(0.508)
MIN
(3.175)
MIN
+0.035
0.325
–0.015
0.018 ± 0.003
(0.457 ± 0.076)
0.100
(2.54)
BSC
+0.889
8.255
(
)
–0.381
N8 1098
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
10
LT1221
U
PACKAGE DESCRIPTIO
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
7
5
8
6
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
SO8 1298
1
3
4
2
0.010 – 0.020
(0.254 – 0.508)
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.008 – 0.010
(0.203 – 0.254)
0°– 8° TYP
0.016 – 0.050
(0.406 – 1.270)
0.050
(1.270)
BSC
0.014 – 0.019
(0.355 – 0.483)
TYP
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
11
LT1221
TYPICAL APPLICATIO S
U
Lag Compensation
20MHz, AV = 50 Instrumentation Amplifier
+
V
IN
LT1221
V
OUT
500Ω
100pF
+
+
10k
V
–
IN
LT1221
–
2k
–
1k
1k
A
= 1, f < 3MHz
V
1k
1k
LT1221 • TA04
250Ω
+
LT1221
V
OUT
200pF
Cable Driver
250Ω
–
10k
LT1221 • TA03
+
–
V
IN
75Ω CABLE
–
75Ω
LT1221
V
OUT
LT1221
+
75Ω
1.5k
510Ω
LT1221 • TA05
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
Unity Gain Stable Version of the LT1221
A ≥ 10 Version of the LT1221
LT1220
45MHz, 250V/µs Amplifier
500MHz, 200V/µs Amplifier
LT1222
V
1221fb LT/CP 0901 1.5K REV B • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1992
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
12
●
●
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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