Page 1
12MHz, 400V/µs Op Amps
FEATURES DESCRIPTION
n
12MHz Gain Bandwidth
n
400V/µs Slew Rate
n
1.25mA Maximum Supply Current per Amplifier
n
Unity-Gain Stable
n
C-Load™ Op Amp Drives All Capacitive Loads
n
10nV/√Hz Input Noise Voltage
n
800µV Maximum Input Offset Voltage
n
300nA Maximum Input Bias Current
n
70nA Maximum Input Offset Current
n
12V/mV Minimum DC Gain, RL = 1k
n
230ns Settling Time to 0.1%, 10V Step
n
280ns Settling Time to 0.01%, 10V Step
n
±12V Minimum Output Swing into 500Ω
n
±2.75V Minimum Output Swing into 150Ω
n
Specified at ±2.5V, ±5V, and ±15V
APPLICATIONS
n
Wideband Amplifiers
n
Buffers
n
Active Filters
n
Data Acquisition Systems
n
Photodiode Amplifiers
The LT®1355/LT1356 are dual and quad low power high
speed operational amplifiers with outstanding AC and DC
performance. The amplifiers feature much lower supply
current and higher slew rate than devices with comparable
bandwidth. The circuit topology is a voltage feedback
amplifier with matched high impedance inputs and the
slewing performance of a current feedback amplifier. The
high slew rate and single stage design provide excellent
settling characteristics which make the circuit an ideal
choice for data acquisition systems. Each output drives a
500Ω load to ±12V with ±15V supplies and a 150Ω load to
± 2.75V on ±5V supplies. The amplifiers are stable with any
capacitive load making them useful in buffer applications.
The LT1355/LT1356 are members of a family of fast, high
performance amplifiers using this unique topology and
employing Linear Technology Corporation’s advanced
bipolar complementary processing. For a single amplifier
version of the LT1355/LT1356 see the LT1354 data sheet.
For higher bandwidth devices with higher supply currents
see the LT1357 through LT1365 data sheets. Bandwidths
of 25MHz, 50MHz, and 70MHz are available with 2mA,
4mA, and 6mA of supply current per amplifier. Singles,
duals, and quads of each amplifier are available.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. C-Load is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
LT1355/LT1356
Dual and Quad
TYPICAL APPLICATION
100kHz, 4th Order Butterworth Filter
6.81k
100pF
V
IN
11.3k6.81k
330pF
–
LT1355
+
1/2
5.23k
10.2k
1000pF
5.23k
–
LT1355
+
1/2
47pF
V
1355/1356 TA01
A V = –1 Large-Signal Response
OUT
13556 TA01B
13556fc
1
Page 2
LT1355/LT1356
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Total Supply Voltage (V+ to V–) .................................36V
Differential Input Voltage (Transient Only)
(Note 2)
Input Voltage
................................................................... ±10V
.............................................................±V
S
Output Short-Circuit Duration (Note 3) ............ Indefinite
Operating Temperature Range (Note 7)
LT1355C/LT1356C/LT1356I..................–40°C to 85°C
LT1356H (TC) ..................................... –40°C to 125°C
PIN CONFIGURATION
LT1355 LT1355
OUT A
–IN A
+IN A
–
V
LT1356 LT1356
OUT A
–IN A
+IN A
V
+IN B
–IN B
OUT B OUT C
TOP VIEW
1
2
A
3
N8 PACKAGE
8-LEAD PDIP
= 150°C, θJA = 130°C/W
T
JMAX
TOP VIEW
1
2
A
3
+
4
5
B
6
N PACKAGE
14-LEAD PDIP
= 150°C, θJA = 110°C/W
T
JMAX
+
8
V
7
OUT B
6
–IN B
B
+IN B
54
14
OUT D
13
–IN D
D
+IN D
12
–
11
V
10
+IN C
C
9
–IN C
87
Specified Temperature Range (Note 8)
LT1355C/LT1356C ................................... 0°C to 70°C
LT1356I ................................................–40°C to 85°C
LT1356H (TC) ..................................... –40°C to 125°C
Maximum Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering, 10 sec)
TOP VIEW
OUT A
1
2
–IN A
+IN A
–
V
OUT A
–IN A
+IN A
+
V
+IN B
–IN B
OUT B OUT C
T
JMAX
A
3
4
S8 PACKAGE
8-LEAD PLASTIC SO
= 150°C, θJA = 190°C/W
T
JMAX
TOP VIEW
1
2
A
3
4
5
B
6
S PACKAGE
16-LEAD PLASTIC SO
= 150°C, θJA = 150°C/W, θJC = 30°C/W
......................... 150°C
..................–65°C to 150°C
...................300°C
+
V
8
7
OUT B
6
–IN B
B
+IN B
5
16
OUT D
15
–IN D
D
+IN D
14
–
13
V
12
+IN C
C
11
–IN C
107
98NC NC
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LT1355CN8#PBF LT1355CN8#TRPBF LT1355CN8 8-Lead PDIP 0°C to 70°C
LT1355CS8#PBF LT1355CS8#TRPBF 1355 8-Lead Plastic SO 0°C to 70°C
LT1356CN#PBF LT1356CN#TRPBF LT1356CN 14-Lead PDIP 0°C to 70°C
LT1356CS#PBF LT1356CS#TRPBF LT1356CS 16-Lead Plastic SO 0°C to 70°C
LT1356IS#PBF LT1356IS#TRPBF LT1356S 16-Lead Plastic SO –40°C to 85°C
LT1356HS#PBF LT1356HS#TRPBF LT1356S 16-Lead Plastic SO –40°C < T
< 125°C
C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
13556fc
2
Page 3
LT1355/LT1356
ELECTRICAL CHARACTERISTICS
TA = 25°C, VCM = 0V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS V
V
OS
I
OS
I
B
e
n
i
n
R
IN
Input Offset Voltage ±15V
Input Offset Current ±2.5V to ±15V 20 70 nA
Input Bias Current ±2.5V to ±15V 80 300 nA
Input Noise Voltage f = 10kHz ±2.5V to ±15V 10 nV/√Hz
Input Noise Current f = 10kHz ±2.5V to ±15V 0.6 pA/√Hz
Input Resistance VCM = ±12V ±15V 70 160 MΩ
Input Resistance Differential ±15V 11 MΩ
C
IN
CMRR Common Mode Rejection Ratio V
PSRR Power Supply Rejection Ratio V
A
VOL
V
OUT
I
OUT
I
SC
SR Slew Rate A
Input Capacitance ±15V 3 pF
Input Voltage Range
Input Voltage Range
Large-Signal Voltage Gain V
+
–
= ±12V
CM
V
= ±2.5V
CM
V
= ±0.5V
CM
= ±2.5V to ±15V 92 106 dB
S
= ±12V, RL = 1k
OUT
V
= ±10V, RL = 500Ω
OUT
V
= ±2.5V, RL = 1k
OUT
V
= ±2.5V, RL = 500Ω
OUT
V
= ±2.5V, RL = 150Ω
OUT
V
= ±1V, RL = 500Ω
OUT
Output Swing RL = 1k, VIN = ±40mV
R
= 500Ω, VIN = ±40mV
L
R
= 500Ω, VIN = ±40mV
L
R
= 150Ω, VIN = ±40mV
L
R
= 500Ω, VIN = ±40mV
L
Output Current V
Short-Circuit Current V
= ±12.0V
OUT
V
= ±2.75V
OUT
= 0V, VIN = ±3V ±15V 30 42 mA
OUT
= –2 (Note 4) ±15V
V
Full-Power Bandwidth 10V Peak (Note 5)
3V Peak (Note 5)
GBW Gain Bandwidth f = 200kHz, R
, t
t
r
f
Rise Time, Fall Time AV = 1, 10% to 90%, 0.1V ±15V
Overshoot A
= 1, 0.1V ±15V
V
Propagation Delay 50% V
t
s
Settling Time 10V Step, 0.1%, AV = –1
10V Step, 0.01%, A
5V Step, 0.1%, A
5V Step, 0.01%, A
= 2k ±15V
L
to 50% V
IN
, 0.1V ±15V
OUT
= –1
V
= –1
V
= –1
V
SUPPLY
±5V
±2.5V
±15V
±5V
±2.5V
±15V
±5V
±2.5V
±15V
±5V
±2.5V
±15V
±15V
±5V
±5V
±5V
±2.5V
±15V
±15V
±5V
±5V
±2.5V
±15V
±5V
±5V
±15V
±5V
±5V
±2.5V
±5V
±5V
±5V
±15V
±15V
±5V
±5V
MIN TYP MAX UNITS
12.0
2.5
0.5
83
78
68
12
5
12
5
1
5
13.3
12.0
3.5
2.75
1.3
24.0
18.3
200
70
9.0
7.5
0.3
0.3
0.4
13.4
3.5
1.1
–13.2
–3.4
–0.9
97
84
75
36
15
36
15
4
20
13.8
13.0
4.0
3.3
1.7
30
25
400
120
6.4
6.4
12.0
10.5
9.0
14
17
20
18
16
19
230
280
240
380
0.8
0.8
1.0
–12.0
–2.5
–0.5
mV
mV
mV
dB
dB
dB
V/mV
V/mV
V/mV
V/mV
V/mV
V/mV
±V
±V
±V
±V
±V
mA
mA
V/µs
V/µs
MHz
MHz
MHz
MHz
MHz
ns
ns
%
%
ns
ns
ns
ns
ns
ns
13556fc
V
V
V
V
V
V
3
Page 4
LT1355/LT1356
ELECTRICAL CHARACTERISTICS
TA = 25°C, VCM = 0V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS V
Differential Gain f = 3.58MHz, A
Differential Phase f = 3.58MHz, A
R
O
I
S
Output Resistance AV = 1, f = 100kHz ±15V 0.7 Ω
Channel Separation V
= ±10V, RL = 500Ω ±15V 100 113 dB
OUT
Supply Current Each Amplifier
= 2, RL = 1k ±15V
V
= 2, RL = 1k ±15V
V
Each Amplifier
SUPPLY
±5V
±5V
±15V
±5V
MIN TYP MAX UNITS
2.2
2.1
3.1
3.1
1.0
0.9
1.25
1.20
The l denotes the specifications which apply over the temperature range 0°C ≤ TA ≤ 70°C, VCM = 0V, unless otherwise noted.
SYMBOL PARAMETER CONDITIONS V
V
OS
I
OS
I
B
CMRR Common Mode Rejection Ratio V
PSRR Power Supply Rejection Ratio V
A
VOL
V
OUT
I
OUT
I
SC
SR Slew Rate A
GBW Gain Bandwidth f = 200kHz, R
I
S
Input Offset Voltage ±15V
Input V
Drift (Note 6) ±2.5V to ±15V
OS
Input Offset Current ±2.5V to ±15V
Input Bias Current ±2.5V to ±15V
= ±12V
CM
V
= ±2.5V
CM
V
= ±0.5V
CM
= ±2.5V to ±15V
S
Large-Signal Voltage Gain V
Output Swing RL = 1k, V
Output Current V
Short-Circuit Current V
Channel Separation
= ±12V, RL = 1k
OUT
V
= ±10V, RL = 500Ω
OUT
V
= ±2.5V, RL = 1k
OUT
V
= ±2.5V, RL = 500Ω
OUT
V
= ±2.5V, RL = 150Ω
OUT
V
= ±1V, RL = 500Ω
OUT
= ±40mV
R
R
R
R
V
V
OUT
OUT
OUT
V
OUT
IN
= 500Ω, V
L
= 500Ω, V
L
= 150Ω, V
L
= 500Ω, V
L
= ±40mV
IN
= ±40mV
IN
= ±40mV
IN
= ±40mV
IN
= ±11.5V
= ±2.5V
= 0V, V
= ±3V ±15V
IN
= – 2, (Note 4) ±15V
= 2k ±15V
L
= ±10V, RL = 500Ω
Supply Current Each Amplifier
Each Amplifier
SUPPLY
±5V
±2.5V
±15V
±5V
±2.5V
±15V
±15V
±5V
±5V
±5V
±2.5V
±15V
±15V
±5V
±5V
±2.5V
±15V
±5V
±5V
±5V
±15V
±15V
±5V
MIN TYP MAX UNITS
l
l
l
l
l
l
l
81
l
77
l
67
l
90 dB
l
10.0
l
3.3
l
10.0
l
3.3
l
0.6
l
3.3
l
13.2
l
11.5
l
3.4
l
2.5
l
1.2
l
23.0
l
16.7
l
24 mA
l
150
l
60
l
7.5
l
6.0
l
98 dB
l
l
5 8 µV/°C
1.0
1.0
1.2
100 nA
450 nA
1.45
1.40
%
%
Deg
Deg
mA
mA
mV
mV
mV
dB
dB
dB
V/mV
V/mV
V/mV
V/mV
V/mV
V/mV
±V
±V
±V
±V
±V
mA
mA
V/µs
V/µs
MHz
MHz
mA
mA
4
13556fc
Page 5
LT1355/LT1356
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the –40°C ≤ TA ≤ 85°C
and –40°C ≤ TC ≤ 125°C temperature ranges, VCM = 0V unless otherwise noted. (Note 8)
SYMBOL PARAMETER CONDITIONS V
V
OS
I
OS
I
B
CMRR Common Mode Rejection Ratio V
PSRR Power Supply Rejection Ratio V
A
VOL
V
OUT
I
OUT
I
SC
SR Slew Rate A
GBW Gain Bandwidth f = 200kHz, R
I
S
Input Offset Voltage ±15V
Input Offset Current ±2.5V to ±15V
Input Bias Current ±2.5V to ±15V
= ±12V
CM
V
= ±2.5V
CM
V
= ±0.5V
CM
= ±2.5V to ±15V
S
Large-Signal Voltage Gain V
= ±12V, RL = 1k
OUT
V
= ±2.5V, RL = 1k
OUT
V
= ±2.5V, RL = 500Ω
OUT
V
= ±1V, RL = 500Ω
OUT
Output Swing RL = 1k, VIN = ±40mV
R
= 500Ω, VIN = ±40mV
L
R
= 500Ω, VIN = ±40mV
L
Output Current V
Short-Circuit Current V
Channel Separation V
= ±12.7V
OUT
V
= ±3.3V
OUT
= 0V, VIN = ±3V ±15V
OUT
= –2, (Note 4) ±15V
V
= 2k ±15V
L
= ±10V, RL = 500Ω ±15V
OUT
Supply Current Each Amplifier
Each Amplifier
SUPPLY
±5V
±2.5V
±15V
±5V
±2.5V
±15V
±5V
±5V
±2.5V
±15V
±5V
±2.5V
±15V
±5V
±5V
±5V
±15V
±5V
MIN TYP MAX UNITS
l
l
l
l
l
l
80
l
76
l
66
l
90 dB
l
6.0
l
4.0
l
1.7
l
1.7
l
12.7
l
3.3
l
1.2
l
12.7
l
6.6
l
16 mA
l
110
l
43
l
6.0
l
4.6
l
96 dB
l
l
1.8
1.8
2.0
250 nA
600 nA
1.55
1.50
mV
mV
mV
dB
dB
dB
V/mV
V/mV
V/mV
V/mV
±V
±V
±V
mA
mA
V/µs
V/µs
MHz
MHz
mA
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: Differential inputs of ±10V are appropriate for transient operation
only, such as during slewing. Large, sustained differential inputs will
cause excessive power dissipation and may damage the part. See Input
Considerations in the Applications Information section of this data sheet
for more details.
Note 3: A heat sink may be required to keep the junction temperature
below absolute maximum when the output is shorted indefinitely.
Note 4: Slew rate is measured between ±10V on the output with ±6V
input for ±15V supplies and ±1V on the output with ±1.75V input for ±5V
supplies.
Note 5: Full power bandwidth is calculated from the slew rate
measurement: FPBW = (SR)/2πV
.
P
Note 6: This parameter is not 100% tested.
Note 7: The LT1355C/LT1356C/LT1356I are guaranteed functional over the
operating temperature range of –40°C to 85°C. The LT1356H is guaranteed
functional over the operating temperature range of –40°C to 125°C case
temperature (T
).
C
Note 8: The LT1355C/LT1356C are guaranteed to meet specified
performance from 0°C to 70°C. The LT1355C/LT1356C are designed,
characterized and expected to meet specified performance from –40°C
to 85°C, but are not tested or QA sampled at these temperatures. The
LT1356I is guaranteed to meet specified performance from –40°C to
85°C. The LT1356H is guaranteed to meet specified performance from
–40°C to 125°C case temperature (T
). The parts are pulse tested at
C
these temperatures. Internal warm-up drift must be taken into account
separately. Care must be taken not to exceed the maximum junction
temperature.
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5
Page 6
LT1355/LT1356
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Supply Voltage
and Temperature
1.4
1.2
1.0
0.8
SUPPLY CURRENT (mA)
0.6
0.4
1050 15 20
SUPPLY VOLTAGE (±V)
125°C
25°C
–55°C
1355/1356 G01
Input Common Mode Range
vs Supply Voltage
+
V
TA = 25°C
–0.5
–1.0
–1.5
–2.0
2.0
1.5
COMMON MODE RANGE (V)
1.0
0.5
< 1mV
∆V
OS
–
V
SUPPLY VOLTAGE (±V)
Input Bias Current
vs Temperature Input Noise Spectral Density
200
175
150
125
100
75
50
INPUT BIAS CURRENT (nA)
25
0
–50 –25 25 100 12550 750
TEMPERATURE (°C)
VS = ±15V
I
B
I
=
————
B
+
+ I
2
1355/1356 G04
–
B
100
e
n
i
n
10
INPUT VOLTAGE NOISE (nV/√Hz)
1
10
1k100 100k10k
FREQUENCY (Hz)
1050 15 20
1355/1356 G02
VS = ±15V
= 25°C
T
A
= 101
A
V
= 100k
R
S
10
1
0.1
1355/1356 G05
Input Bias Current
vs Input Common Mode Voltage
200
VS = ±15V
T
A
150
I
B
100
50
INPUT BIAS CURRENT (nA)
0
–50
–15 –10 0 10 155–5
Open-Loop Gain
vs Resistive Load
100
= 25°C
T
A
INPUT CURRENT NOISE (pA/√Hz)
90
80
70
OPEN-LOOP GAIN (dB)
60
50
10
= 25°C
+
–
I
+ I
B
B
=
————
2
INPUT COMMON MODE VOLTAGE (V)
1355/1356 G03
VS = ±15V
VS = ±5V
100 10k
LOAD RESISTANCE (Ω)
1k
1355/1356 G06
Open-Loop Gain vs Temperature
97
VS = ±15V
= 1k
R
96
L
= ±12V
V
O
95
94
93
92
91
OPEN-LOOP GAIN (dB)
90
89
88
–50 –25 25 100 12550 750
TEMPERATURE (°C)
6
1355/1356 G07
Output Voltage Swing
vs Supply Voltage
+
V
TA = 25°C
–1
–2
–3
3
2
OUTPUT VOLTAGE SWING (V)
1
–
V
SUPPLY VOLTAGE (±V)
RL = 1k
= 500Ω
R
L
= 500Ω
R
L
R
= 1k
L
1050 15 20
1355/1356 G08
Output Voltage Swing
vs Load Current
+
–0.5
V
VS = ±5V
–1.0
–1.5
–2.0
–2.5
OUTPUT VOLTAGE SWING (V)
–
+ 0.5
V
V
IN
2.5
2.0
–40°C
1.5
1.0
–50 –40 –10 30 40 500 10 20–20–30
= 100mV
85°C
OUTPUT CURRENT (mA)
85°C
–40°C
25°C
25°C
1355/1356 G09
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Page 7
TYPICAL PERFORMANCE CHARACTERISTICS
LT1355/LT1356
Output Short-Circuit Current
vs Temperature
65
60
55
50
45
40
35
30
25
OUTPUT SHORT-CIRCUIT CURRENT (mA)
20
–50 –25 25 100 12550 750
SOURCE
TEMPERATURE (°C)
SINK
Output Impedance vs Frequency
1k
AV = 100
100
10
AV = 10
1
OUTPUT IMPEDANCE (Ω)
0.1
0.01
10k
AV = 1
100k 100M
1M
FREQUENCY (Hz)
VS = ±5V
VS = ±15V
T
10M
1355/1356 G10
= 25°C
A
1355/1356 G13
Settling Time vs Output Step
(Noninverting)
10
VS = ±15V
8
= 1
A
V
6
10mV
4
2
0
–2
OUTPUT SWING (V)
–4
–6
–8
–10
10mV
50 200 300 350250100 150
SETTLING TIME (ns)
Frequency Response
vs Capacitive Load
10
VS = ±15V
8
= 25°C
T
A
= –1
A
V
6
4
2
0
–2
–4
VOLTAGE MAGNITUDE (dB)
–6
–8
–10
100k
1M 100M10M
FREQUENCY (Hz)
1mV
1mV
C = 1000pF
C = 500pF
C = 100pF
C = 50pF
C = 0
1355/1356 G19
1355/1356 G11
Settling Time vs Output Step
(Inverting)
10
VS = ±15V
8
= –1
A
V
6
4
10mV
2
0
–2
OUTPUT SWING (V)
–4
–6
–8
–10
50 200 300 350250100 150
SETTLING TIME (ns)
Gain Bandwidth and Phase
Margin vs Supply Voltage
18
TA = 25°C
17
16
15
14
13
12
11
GAIN BANDWIDTH (MHz)
10
9
8
GAIN BANDWIDTH
1050 15 20
SUPPLY VOLTAGE (±V)
1mV
10mV
PHASE MARGIN
1mV
1355/1356 G12
1355/1356 G15
50
48
46
PHASE MARGIN (DEG)
44
42
40
38
36
34
32
30
Gain Bandwidth and Phase
Margin vs Temperature
18
17
16
15
14
13
12
11
GAIN BANDWIDTH (MHz)
10
GAIN BANDWIDTH
V
S
9
8
–50 –25 25 100 12550 750
= ±5V
PHASE MARGIN
= ±15V
V
S
TEMPERATURE (°C)
PHASE MARGIN
= ±5V
V
S
GAIN BANDWIDTH
= ±15V
V
S
1355/1356 G16
52
50
48
PHASE MARGIN (DEG)
46
44
42
40
38
36
34
32
GAIN (dB)
Frequency Response
vs Supply Voltage (A V = 1)
5
T
= 25°C
A
4
= 1
A
V
= 2k
R
L
3
2
1
0
–1
–2
–3
–4
–5
100k
±5V
1M 100M
FREQUENCY (Hz)
±2.5V
10M
±15V
1355/1356 G17
Frequency Response
vs Supply Voltage (A V = –1)
5
T
= 25°C
A
4
= –1
A
V
= RG = 2k
R
F
3
2
1
0
GAIN (dB)
–1
–2
–3
–4
–5
100k
1M 100M
FREQUENCY (Hz)
±2.5V
±5V
±15V
10M
1355/1356 G18
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7
Page 8
LT1355/LT1356
TYPICAL PERFORMANCE CHARACTERISTICS
Gain and Phase vs Frequency
70
60
50
40
30
GAIN (dB)
20
10
0
–10
10k
= 25°C
T
A
= –1
A
V
= RG = 2k
R
F
PHASE
VS = ±15V
GAIN
VS = ±5V
100k 100M
FREQUENCY (Hz)
VS = ±5V
1M
VS = ±15V
10M
1355/1356 G14
120
100
PHASE (DEG)
80
60
40
20
0
Power Supply Rejection Ratio
vs Frequency
100
80
60
40
20
POWER SUPPLY REJECTION RATIO (dB)
0
+PSRR
–PSRR
100k 1M1k 10k100 10M 100M
FREQUENCY (Hz)
VS = ±15V
= 25°C
T
A
1355/1356 G20
Common Mode Rejection Ratio
vs Frequency
120
VS = ±15V
= 25°C
T
A
100
80
60
40
20
COMMON MODE REJECTION RATIO (dB)
0
1k 100M10M1M100k10k
FREQUENCY (Hz)
Slew Rate vs Supply Voltage Slew Rate vs Temperature Slew Rate vs Input Level
600
TA = 25°C
= –1
A
V
500
= RG = 2k
R
F
SR
SR =
400
300
200
SLEW RATE (V/µs)
100
—————
+
+ SR
2
350
–
300
250
AV = –2
SR = —————
200
150
SLEW RATE (V/µs)
100
SR+ + SR
2
= ±15V
V
S
–
V
= ±5V
S
500
TA = 25°C
= ±15V
V
S
= –1
A
V
400
= RG = 2k
R
F
SR
SR =
300
200
SLEW RATE (V/µs)
100
—————
+
+ SR
2
–
1355/1356 G21
0
0 15105
SUPPLY VOLTAGE (±V)
Total Harmonic Distortion
vs Frequency
0.1
TA = 25°C
= 3V
V
O
RMS
RL = 2k
0.01
AV = –1
0.001
AV = 1
TOTAL HARMONIC DISTORTION (%)
0.0001
10
100 100k
1k
FREQUENCY (Hz)
10k
1355/1356 G22
1355/1356 G25
50
–50 –25 25 100 12550 750
TEMPERATURE (°C)
Undistorted Output Swing
vs Frequency (±15V)
30
25
)
P-P
20
15
VS = ±15V
10
= 5k
R
OUTPUT VOLTAGE (V
L
= 1,
A
V
1% MAX DISTORTION
5
= –1,
A
V
4% MAX DISTORTION
0
100k 1M
FREQUENCY (Hz)
AV = 1
AV = –1
1355/1356 G23
10M
1355/1356 G26
0
0 8 16 201242 10 18146
INPUT LEVEL (V
Undistorted Output Swing
vs Frequency (±5V)
10
8
)
P-P
6
4
VS = ±5V
= 5k
R
L
OUTPUT VOLTAGE (V
= 1,
A
V
2
2% MAX DISTORTION
= –1,
A
V
3% MAX DISTORTION
0
100k 1M
FREQUENCY (Hz)
AV = –1
AV = 1
P-P
)
1355/1356 G24
10M
1355/1356 G27
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8
Page 9
LT1355/LT1356
TYPICAL PERFORMANCE CHARACTERISTICS
2nd and 3rd Harmonic Distortion
vs Frequency Crosstalk vs Frequency Capacitive Load Handling
–20
VS = ±15V
= 2V
V
O
–30
–40
–50
–60
HARMONIC DISTORTION (dB)
–70
–80
100k 200k 400k
P-P
RL = 2k
= 2
A
V
3RD HARMONIC
FREQUENCY (Hz)
2ND HARMONIC
1M 2M 4M
10M
1355/1356 G28
–40
TA = 25°C
= 0dBm
V
IN
–50
= 500Ω
R
L
= 1
A
V
–60
–70
–80
–90
CROSSTALK (dB)
–100
–110
–120
100k
1M 100M
FREQUENCY (Hz)
10M
1355/1356 G29
100
TA = 25°C
= ±15V
V
S
50
OVERSHOOT (%)
0
10p
100p 0.1µ
AV = 1
CAPACITIVE LOAD (F)
AV = –1
1000p 0.01µ
1µ
1355/1356 G30
Small-Signal Transient
(A V = 1)
Large-Signal Transient
(A V = 1)
Small-Signal Transient
(A V = –1)
12556 G31 12556 G32 12556 G33
Large-Signal Transient
(A V = –1)
Small-Signal Transient
(A V = –1, CL = 1000pF)
Large-Signal Transient
(A V = 1, CL = 10,000pF)
12556 G34 12556 G35 12556 G36
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9
Page 10
LT1355/LT1356
APPLICATIONS INFORMATION
Layout and Passive Components
The LT1355/LT1356 amplifiers are easy to use and tolerant
of less than ideal layouts. For maximum performance (for
example, fast 0.01% settling) use a ground plane, short
lead lengths, and RF-quality bypass capacitors (0.01µF to
0.1µF). For high drive current applications use low ESR
bypass capacitors (1µF to 10µF tantalum).
The parallel combination of the feedback resistor and gain
setting resistor on the inverting input combine with the
input capacitance to form a pole which can cause peaking
or oscillations. If feedback resistors greater than 5k are
used, a parallel capacitor of value:
CF > RG x CIN/R
should be used to cancel the input pole and optimize
dynamic performance. For unity-gain applications where
a large feedback resistor is used, C
than or equal to C
Capacitive Loading
The LT1355/LT1356 are stable with any capacitive load.
As the capacitive load increases, both the bandwidth and
phase margin decrease so there will be peaking in the
frequency domain and in the transient response. Coaxial
cable can be driven directly, but for best pulse fidelity a
resistor of 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.
Input Considerations
Each of the LT1355/LT1356 inputs is the base of an NPN
and a PNP transistor whose base currents are of opposite
polarity and provide first-order bias current cancellation.
Because of variation in the matching of NPN and PNP beta,
the polarity of the input bias current can be positive or
negative. The offset current does not depend on NPN/PNP
beta matching and is well controlled. The use of balanced
source resistance at each input is recommended for applications where DC accuracy must be maximized.
IN
F
should be greater
F
.
The inputs can withstand transient differential input voltages up to 10V without damage and need no clamping
or source resistance for protection. Differential inputs,
however, generate large supply currents (tens of mA) as
required for high slew rates. If the device is used with
sustained differential inputs, the average supply current will
increase, excessive power dissipation will result and the
part may be damaged. The part should not be used as a
comparator, peak detector or other open-loop application
with large, sustained differential inputs. Under normal,
closed-loop operation, an increase of power dissipation is
only noticeable in applications with large slewing outputs
and is proportional to the magnitude of the differential input
voltage and the percent of the time that the inputs are apart.
Measure the average supply current for the application in
order to calculate the power dissipation.
Circuit Operation
The LT1355/LT1356 circuit topology is a true voltage
feedback amplifier that has the slewing behavior of a current feedback amplifier. The operation of the circuit can
be understood by referring to the simplified schematic.
The inputs are buffered by complementary NPN and
PNP emitter followers which drive an 800Ω resistor.
The input voltage appears across the resistor generating
currents which are mirrored into the high impedance
node. Complementary followers form an output stage
which buffers the gain node from the load. The bandwidth
is set by the input resistor and the capacitance on the
high impedance node. The slew rate is determined by the
current available to charge the gain node capacitance.
This current is the differential input voltage divided by
R1, so the slew rate is proportional to the input. Highest
slew rates are therefore seen in the lowest gain configurations. For example, a 10V output step in a gain of 10 has
only a 1V input step, whereas the same output step in
unity gain has a 10 times greater input step. The curve of
Slew Rate vs Input Level illustrates this relationship. The
LT1355/LT1356 are tested for slew rate in a gain of –2 so
higher slew rates can be expected in gains of 1 and –1,
and lower slew rates in higher gain configurations.
10
13556fc
Page 11
APPLICATIONS INFORMATION
LT1355/LT1356
The RC network across the output stage is bootstrapped
when the amplifier is driving a light or moderate load and
has no effect under normal operation. When driving a capacitive load (or a low value resistive load) the network is
incompletely bootstrapped and adds to the compensation
at the high impedance node. The added capacitance slows
down the amplifier which improves the phase margin by
moving the unity-gain frequency away from the pole formed
by the output impedance and the capacitive load. The zero
created by the RC combination adds phase to ensure that
even for very large load capacitances, the total phase lag
can never exceed 180 degrees (zero phase margin) and
the amplifier remains stable.
Power Dissipation
The LT1355/LT1356 combine high speed and large output
drive in small packages. Because of the wide supply voltage range, it is possible to exceed the maximum junction
temperature under certain conditions. Maximum junction
temperature (T
temperature (T
) is calculated from the ambient or case
J
or TC) and power dissipation (PD) as
A
follows:
LT1355CN8: TJ = TA + (PD • 130°C/W)
LT1355CS8: TJ = TA + (PD • 190°C/W)
LT1356CN: TJ = TA + (PD • 110°C/W)
LT1356CS: TJ = TA + (PD • 150°C/W)
LT1356HS: TJ = TC + (PD • 30°C/W)
Worst-case power dissipation occurs at the maximum
supply current and when the output voltage is at 1/2 of
either supply voltage (or the maximum swing if less than
1/2 supply voltage). For each amplifier P
P
= (V+ – V–)(I
DMAX
) + (V+/2)2/R
SMAX
DMAX
L
is:
Example: LT1356 in S16 at TA = 70°C, VS = ±15V, RL = 1k
P
T
= (30V)(1.45mA) + (7.5V)2/1kΩ = 99.8mW
DMAX
= 70°C + (4 • 99.8mW)(150°C/W) = 130°C
JMAX
SIMPLIFIED SCHEMATIC
+
V
–IN
–
V
800Ω
R1
+IN
R
C
C
C
C
1355/1356 SS01
OUT
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11
Page 12
LT1355/LT1356
PACKAGE DESCRIPTION
.300 – .325
(7.620 – 8.255)
N Package
8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510 Rev I)
.045 – .065
(1.143 – 1.651)
.130 ±.005
(3.302 ±0.127)
.400*
(10.160)
MAX
8 7 6
5
.065
(1.651)
.008 – .015
(0.203 – 0.381)
+.035
.325
–.015
+0.889
8.255
( )
–0.381
NOTE:
1. DIMENSIONS ARE
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
INCHES
MILLIMETERS
TYP
.100
(2.54)
BSC
N Package
14-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510 Rev I)
.255 ±.015*
(6.477 ±0.381)
.120
(3.048)
MIN
.018 ±.003
(0.457 ±0.076)
14
(0.508)
1213
.020
MIN
N8 REV I 0711
.770*
(19.558)
MAX
11
.255 ±.015*
(6.477 ±0.381)
1 2
8910
4
3
12
.300 – .325
(7.620 – 8.255)
(0.508)
.008 – .015
(0.203 – 0.381)
+.035
.325
–.015
+0.889
8.255
( )
–0.381
NOTE:
1. DIMENSIONS ARE
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
INCHES
MILLIMETERS
.020
MIN
.130 ±.005
(3.302 ±0.127)
.120
(3.048)
MIN
.005
(0.127)
MIN
2
31
.045 – .065
(1.143 – 1.651)
.100
(2.54)
BSC
6
7
.065
(1.651)
TYP
.018 ±.003
(0.457 ±0.076)
N14 REV I 0711
13556fc
5
4
Page 13
PACKAGE DESCRIPTION
8-Lead Plastic Small Outline (Narrow .150 Inch)
.050 BSC
S8 Package
(Reference LTC DWG # 05-08-1610)
.045 ±.005
8
.189 – .197
(4.801 – 5.004)
NOTE 3
7
6
LT1355/LT1356
5
.245
MIN
.030 ±.005
TYP
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
(0.254 – 0.508)
.008 – .010
(0.203 – 0.254)
NOTE:
1. DIMENSIONS IN
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
× 45°
.016 – .050
(0.406 – 1.270)
INCHES
(MILLIMETERS)
.160 ±.005
.228 – .244
(5.791 – 6.197)
0°– 8° TYP
.053 – .069
(1.346 – 1.752)
.014 – .019
(0.355 – 0.483)
TYP
.150 – .157
(3.810 – 3.988)
NOTE 3
1
3
2
4
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
SO8 0303
13556fc
13
Page 14
LT1355/LT1356
PACKAGE DESCRIPTION
16-Lead Plastic Small Outline (Narrow .150 Inch)
.050 BSC
N
.045 ±.005
S Package
(Reference LTC DWG # 05-08-1610)
16
14
15
.386 – .394
(9.804 – 10.008)
NOTE 3
13
12
11 10
9
.245
MIN
.030 ±.005
TYP
(0.254 – 0.508)
.008 – .010
(0.203 – 0.254)
.160 ±.005
1 2 3 N/2
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
NOTE:
1. DIMENSIONS IN
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
× 45°
0° – 8° TYP
.016 – .050
(0.406 – 1.270)
INCHES
(MILLIMETERS)
.228 – .244
(5.791 – 6.197)
.053 – .069
(1.346 – 1.752)
.014 – .019
(0.355 – 0.483)
N
TYP
.150 – .157
(3.810 – 3.988)
NOTE 3
N/2
4
5
.050
(1.270)
BSC
3
2
1
7
6
8
.004 – .010
(0.101 – 0.254)
S16 0502
14
13556fc
Page 15
LT1355/LT1356
REVISION HISTORY
REV DATE DESCRIPTION PAGE NUMBER
C 05/12 Added H- and I-grades 2, 5, 11
(Revision history begins at Rev C)
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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
13556fc
15
Page 16
LT1355/LT1356
TYPICAL APPLICATIONS
Instrumentation Amplifier
R5
432Ω
R1
20k
–
V
IN
–
LT1355
+
1/2
R2
2k
R3
2k
–
1/2
LT1355
+
R4
20k
V
OUT
+
R
4
12213423
A
=+ +
1
V
R
3
TRIM R5 FOR GAIN
TRIM R1 FOR COMMON MODE REJECTION
BW = 120kHz
RRRRRR
+
+
=
104
R
5
1355/1356 TA03
100kHz, 4th Order Butterworth Filter (Sallen-Key)
C4
C2
330pF
–
1/2
LT1355
V
IN
R1
2.87k
R2
26.7k
+
C1
100pF
R3
2.43k
1000pF
R4
15.4k
–
+
C3
68pF
1/2
LT1355
V
1355/1356 TA04
OUT
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LT1354 12MHz, 400V/µs Op Amp Single Version of LT1355/LT1356
LT1352/LT1353 Dual and Quad 250µA, 3MHz, 200V/µs Op Amps Lower Power Version of LT1355/LT1356, V
LT1358/LT1359 Dual and Quad 25MHz, 600Vµs Op Amps Faster Version of LT1355/LT1356, V
Linear Technology Corporation
16
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 l FAX: (408) 434-0507
l
www.linear.com
= 0.6mV, IS = 2mA/Amplifier
OS
LINEAR TECHNOLOGY CORPORATION 1994
= 0.6mV, IS = 250µA/Amplifier
OS
LT 0512 REV C • PRINTED IN USA
13556fc
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