LT1221 [Linear]
150MHz Operational Amplifier; 150MHz的运算放大器
| 型号： | LT1221 |
| 厂家： | 
Linear |
| 描述： | 150MHz Operational Amplifier |
| 文件： | 总8页 (文件大小：294K) |
| 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
EATURE
S
F
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Gain-Bandwidth: 150MHz
TheLT1221isaveryhighspeedoperationalamplifierwith
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 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
Differential Gain: 0.08%, AV = 4, RL = 150Ω
Differential Phase: 0.2°, AV = 4, RL = 150Ω
O U
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.
PPLICATI
A
S
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Wideband Amplifiers
Buffers
Active Filters
Video and RF Amplification
Cable Drivers
and LTC are registered trademarks and LT is a trademark of Linear Technology Corporation.
C-Load is a trademark of Linear Technology Cortporation.
8-, 10-, 12-Bit Data Acquisition Systems
U
TYPICAL APPLICATION
Summing Amplifier
Summing Amplifier Large-Signal Response
1k
1k
1k
1k
V
V
A
B
–
+
V
LT1221
OUT
V
C
LT1221 • TA01
LT1221 • TA02
f = 2MHz
VS = ±15V
IN = 10VP-P
V
1
LT1221
W W W
U
ABSOLUTE AXI U RATI GS
Total Supply Voltage (V+ to V–) ............................. 36V
Differential Input Voltage ........................................ ±6V
Input Voltage .......................................................... ±VS
Output Short-Circuit Duration (Note 1)........... Indefinite
Specified Temperature Range
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
LT1221C (Note 2)................................... 0°C to 70°C
LT1221M ......................................... –55°C to 125°C
W
U
/O
PACKAGE RDER I FOR ATIO
TOP VIEW
ORDER PART
ORDER PART
TOP VIEW
NUMBER
NULL
NUMBER
NULL
–IN
1
2
3
4
NULL
8
7
6
5
+
8
V
+
1
3
V
SPECIAL
ORDER
CONSULT
FACTORY
LT1221CN8
LT1221MJ8
LT1221CS8
NULL
–IN
+IN
7
5
+IN
V
OUT
–
6
2
V
OUT
V
NC
NC
J8 PACKAGE
N8 PACKAGE
4
8-LEAD CERAMIC DIP 8-LEAD PLASTIC DIP
S8 PART MARKING
1221
–
V
S8 PACKAGE
8-LEAD PLASTIC SOIC
H PACKAGE
8-LEAD TO-5 METAL CAN
TJMAX = 175°C, θJA = 100°C/W (J)
TJMAX = 150°C, θJA = 130°C/W (N)
TJMAX = 150°C, θJA = 190°C/W (S)
TJMAX = 175°C, θJA = 150°C/W
Consult factory for Industrial grade parts.
VS = ±15V, TA = 25°C, VCM = 0V, unless otherwise specified.
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
(Note 3)
MIN
TYP
200
100
100
6
MAX
600
300
300
UNITS
µV
V
Input Offset Voltage
Input Offset Current
Input Bias Current
Input Noise Voltage
Input Noise Current
Input Resistance
OS
I
I
nA
nA
OS
B
e
f = 10kHz
f = 10kHz
nV/√Hz
pA/√Hz
n
i
2
n
R
V
= ±12V
CM
Differential
20
12
45
80
MΩ
kΩ
IN
C
Inut Capacitance
2
14
–13
pF
V
V
IN
Input Voltage Range (Positive)
Input Voltage Range (Negative)
–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
12
V/mV
±V
VOL
OUT
OUT
OUT
L
R = 500Ω
L
I
Output Current
V
= ±12V
24
26
mA
OUT
SR
Slew Rate
Full Power Bandwidth
Gain-Bandwidth
(Note 4)
10V Peak (Note 5)
f = 1MHz
200
250
4
V/µs
MHz
MHz
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 6)
0.08
0.02
%
%
L
f = 3.58MHz, R = 1k (Note 6)
L
f = 3.58MHz, R = 150Ω (Note 6)
0.20
0.05
DEG
DEG
L
f = 3.58MHz, R = 1k (Note 6)
L
R
Output Resistance
Supply Current
A = 4, f = 1MHz
V
0.3
8
Ω
O
I
10.5
mA
S
VS = ±15V, 0°C ≤ TA ≤ 70°C, VCM = 0V, unless otherwise specified.
SYMBOL
PARAMETER
Input Offset Voltage
CONDITIONS
(Note 3)
MIN
TYP
0.2
15
MAX
1.5
UNITS
mV
V
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
CM
= ±12V
92
90
dB
dB
V = ±5V to ±15V
S
A
V
V
OUT
= ±10V, R = 500Ω
40
V/mV
±V
mA
VOL
OUT
OUT
L
R = 500Ω
12
24
L
I
Output Current
V
OUT
= ±12V
26
SR
Slew Rate
(Note 4)
180
250
8
V/µs
mA
I
Supply Current
11
S
VS = ±15V, –55°C ≤ TA ≤ 125°C, VCM = 0V, unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
0.2
MAX
UNITS
mV
V
Input Offset Voltage
(Note 3)
●
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
dB
B
CMRR
PSRR
Common-Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
Output Swing
V
= ±12V
92
90
CM
V = ±5V to ±15V
dB
S
A
V
V
= ±10V, R = 500Ω
12.5
10
12
V/mV
±V
±V
VOL
OUT
OUT
L
R = 500Ω
R = 1k
●
●
13
13
L
L
I
Output Current
V
V
= ±10V
= ±12V
●
●
20
12
26
13
mA
mA
OUT
OUT
OUT
SR
Slew Rate
Supply Current
(Note 4)
●
●
130
250
8
V/µs
mA
I
11
S
The
● denotes specifications which apply over the full temperature range.
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 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 5: FPBW = SR/2πV .
Note 6: 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).
P
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
20
15
10
5
11
10
20
15
10
5
T
= 25°C
T
= 25°C
OS
A
L
A
R
= 500Ω
∆V = 0.5mV
∆V = 30mV
OS
T = 125°C
T = 25°C
+V
–V
9
8
CM
+V
SW
CM
–V
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 (±V)
SUPPLY VOLTAGE (±V)
SUPPLY VOLTAGE (±V)
LT1221 • TPC01
LT1221 • TPC02
LT1221 • TPC03
Output Voltage Swing
vs Resistive Load
Input Bias Current
vs Input Common-Mode Voltage
Open-Loop Gain
vs Resistive Load
30
25
500
400
300
200
100
0
110
100
T
= 25°C
= ±15V
T
= 25°C
T
= 25°C
OS
A
S
A
A
V
∆V = 30mV
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 (Ω)
INPUT COMMON-MODE VOLTAGE (V)
LOAD RESISTANCE (Ω)
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
= 25°C
= 101
V
T
= ±15V
= 25°C
S
A
V
+PSRR
S
A
T
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 (Hz)
FREQUENCY (Hz)
TEMPERATURE (°C)
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)
120
100
10
8
10
8
V
T
= ±15V
= 25°C
V
T
= ±15V
= 25°C
S
A
S
A
V
T
= ±15V
= 25°C
S
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
1k
100k
FREQUENCY (Hz)
1M
10M
100M
0
25
75
SETTLING TIME (ns)
100
125
0
25
75
SETTLING TIME (ns)
100
125
10k
50
50
LT1221 • TPC10
LT1220 • TPC11
LT1221 • TPC12
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
= 25°C
= 4
V
= ±15V
= 25°C
= –5
S
A
V
S
S
A
V
T
T
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 (MHz)
100
10k
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
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
= 500Ω
S
O
L
S
V
A
= ±15V
S
V
= 3V
= –5
R
+
–
A
= 4
V
(SR ) + (SR )
2
SR =
A
= –4
V
0.0001
10
100
1k
10k
100k
–50 –25
0
25
50
75 100 125
–50 –25
0
25
50
75 100 125
FREQUENCY (Hz)
TEMPERATURE (°C)
TEMPERATURE (°C)
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
V
S = ±15V
V
V
V
IN = 5VP-P
Small Signal, AV = –4,
CL = 1,000pF
Large Signal, AV = –4
Small Signal, AV = –4
LT1221 • TPC22
LT1221 • TPC23
LT1221 • TPC24
f = 5MHz
f = 2MHz
f = 500kHz
VS = ±15V
IN = 25mV
VS = ±15V
IN = 5VP-P
V
S = ±15V
V
V
VIN = 42mV
U
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.
U
TYPICAL APPLICATIONS N
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
LT1221 • TA04
1k
1k
250Ω
+
LT1221
V
OUT
200pF
Cable Driver
250Ω
–
10k
+
–
V
IN
75Ω CABLE
LT1221 • TA03
75Ω
–
LT1221
V
OUT
LT1221
75Ω
+
1.5k
510Ω
LT1221 • TA05
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.
7
LT1221
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
U
Dimensions in inches (millimeters) unless otherwise noted.
PACKAGE DESCRIPTION
0.335 – 0.370
(8.509 – 9.398)
DIA
0.305 – 0.335
(7.747 – 8.509)
0.027 – 0.045
(0.686 – 1.143)
45°TYP
0.040
(1.016)
MAX
0.027 – 0.034
(0.686 – 0.864)
0.050
0.165 – 0.185
(1.270)
MAX
(4.191 – 4.699)
H8 Package
8-Lead TO-5
Metal Can
0.200 – 0.230
REFERENCE
PLANE
(5.080 – 5.842)
SEATING
PLANE
BSC
GAUGE
PLANE
0.500 – 0.750
(12.700 – 19.050)
0.010 – 0.045
(0.254 – 1.143)
0.110 – 0.160
(2.794 – 4.064)
INSULATING
STANDOFF
0.016 – 0.021
(0.406 – 0.533)
NOTE: LEAD DIAMETER IS UNCONTROLLED BETWEEN
THE REFERENCE PLANE AND SEATING PLANE.
0.405
(10.287)
MAX
0.005
(0.127)
MIN
0.200
(5.080)
MAX
0.300 BSC
(0.762 BSC)
CORNER LEADS OPTION
(4 PLCS)
6
5
4
8
7
0.015 – 0.060
(0.381 – 1.524)
0.023 – 0.045
0.025
(0.635)
RAD TYP
0.220 – 0.310
(5.588 – 7.874)
J8 Package
8-Lead Ceramic Dip
(0.584 – 1.143)
HALF LEAD
OPTION
0.008 – 0.018
(0.203 – 0.457)
0° – 15°
0.045 – 0.068
(1.143 – 1.727)
FULL LEAD
OPTION
1
2
3
0.045 – 0.068
(1.143 – 1.727)
0.385 ± 0.025
(9.779 ± 0.635)
0.125
3.175
MIN
0.100 ± 0.010
(2.540 ± 0.254)
0.014 – 0.026
(0.360 – 0.660)
NOTE: LEAD DIMENSIONS APPLY TO SOLDER
DIP/PLATE OR TIN PLATE LEADS.
0.400*
(10.160)
MAX
0.130 ± 0.005
(3.302 ± 0.127)
0.300 – 0.325
(7.620 – 8.255)
0.045 – 0.065
(1.143 – 1.651)
8
7
6
5
N8 Package
8-Lead Plastic Dip
0.065
(1.651)
TYP
0.255 ± 0.015*
(6.477 ± 0.381)
0.009 – 0.015
(0.229 – 0.381)
0.125
(3.175)
MIN
0.015
(0.380)
MIN
+0.025
–0.015
1
2
4
3
0.045 ± 0.015
(1.143 ± 0.381)
0.325
+0.635
8.255
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR
PROTRUSIONS. MOLD FLASH OR PROTURSIONS SHALL
NOT EXCEED 0.010 INCH (0.254mm).
(
)
–0.381
0.100 ± 0.010
(2.540 ± 0.254)
0.018 ± 0.003
(0.457 ± 0.076)
0.189 – 0.197*
(4.801 – 5.004)
0.010 – 0.020
(0.254 – 0.508)
8
7
6
5
× 45°
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
S8 Package
0.008 – 0.010
(0.203 – 0.254)
0°– 8° TYP
8-Lead Plastic SOIC
0.150 – 0.157*
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
0.016 – 0.050
0.406 – 1.270
0.050
(1.270)
BSC
0.014 – 0.019
(0.355 – 0.483)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).
1
2
3
4
LT/GP 0894 5K REV A • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1992
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
8
●
●
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
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