LT1364/LT1365
Dual and Quad
70MHz, 1000V/µs Op Amps
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DESCRIPTIO
FEATURES
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70MHz Gain Bandwidth
1000V/µs Slew Rate
7.5mA Maximum Supply Current per Amplifier
Unity-Gain Stable
C-LoadTM Op Amp Drives All Capacitive Loads
9nV/√Hz Input Noise Voltage
1.5mV Maximum Input Offset Voltage
2µA Maximum Input Bias Current
350nA Maximum Input Offset Current
50mA Minimum Output Current
±7.5V Minimum Output Swing into 150Ω
4.5V/mV Minimum DC Gain, RL=1k
50ns Settling Time to 0.1%, 10V Step
0.06% Differential Gain, AV=2, RL=150Ω
0.04° Differential Phase, AV=2, RL=150Ω
Specified at ±2.5V, ±5V, and ±15V
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APPLICATIO S
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Wideband Amplifiers
Buffers
Active Filters
Video and RF Amplification
Cable Drivers
Data Acquisition Systems
The LT1364/LT1365 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 LT1364/LT1365 see the LT1363 data sheet.
For 50MHz devices with 4mA supply currents see the
LT1360 through LT1362 data sheets. For lower supply
current amplifiers see the LT1354 to LT1359 data sheets.
Singles, duals, and quads of each amplifier are available.
, LTC and LT are registered trademarks of Linear Technology Corporation.
C-Load is a trademark of Linear Technology Corporation
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The LT1364/LT1365 are dual and quad 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 150Ω load
to ±7.5V with ±15V supplies and to ±3.4V on ±5V supplies. The amplifiers are stable with any capacitive load
making them useful in buffer or cable driving applications.
TYPICAL APPLICATIO
Cable Driver Frequency Response
AV = –1 Large-Signal Response
2
VS = ±15V
0
GAIN (dB)
VS = ±2.5V
VS = ±5V
–2
VS = ±10V
IN
–4
–6
+
1/2
LT1364
–
510Ω
75Ω
OUT
75Ω
510Ω
–8
1
10
FREQUENCY (MHz)
100
1364/1365 TA02
1364/1365 TA01
1
LT1364/LT1365
W W
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ABSOLUTE MAXIMUM RATINGS
(Note 1)
Total Supply Voltage (V + to V –) ............................... 36V
Differential Input Voltage
(Transient Only, Note 2) .................................... ±10V
Input Voltage ............................................................ ±VS
Output Short-Circuit Duration (Note 3) ............ Indefinite
Operating Temperature Range (Note 8) ...–40°C to 85°C
Specified Temperature Range (Note 9) ....–40°C to 85°C
Maximum Junction Temperature (See Below)
Plastic Package ................................................ 150°C
Storage Temperature Range ..................–65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
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PACKAGE/ORDER INFORMATION
TOP VIEW
OUT A
1
–IN A
2
+IN A
3
V–
4
V+
8
7
OUT B
6
–IN B
5
+IN B
A
B
ORDER PART
NUMBER
LT1364CN8
TOP VIEW
OUT A
1
–IN A
2
+IN A
3
V–
4
OUT B
6
–IN B
B
5
+IN B
LT1364CS8
S8 PART MARKING
ORDER PART
NUMBER
1364
1
–IN A
2
+IN A
3
V+
4
10 +IN C
+IN B
5
9
–IN C
–IN B
6
8
OUT C
OUT B
7
10 OUT C
NC
8
9
1
14 OUT D
–IN A
2
13 –IN D
+IN A
3
V+
4
+IN B
5
–IN B
6
OUT B
7
12 +IN D
LT1365CN
11 V –
C
N PACKAGE
14-LEAD PDIP
ORDER PART
NUMBER
TOP VIEW
OUT A
OUT A
B
7
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 190°C/ W
TOP VIEW
D
ORDER PART
NUMBER
V+
A
N8 PACKAGE
8-LEAD PDIP
TJMAX = 150°C, θJA = 130°C/ W
A
8
16 OUT D
15 –IN D
A
D
LT1365CS
14 +IN D
13 V –
12 +IN C
B
C
11 –IN C
NC
S PACKAGE
16-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 110°C/ W
TJMAX = 150°C, θJA = 150°C/ W
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
TA = 25°C, VCM = 0V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
VSUPPLY
TYP
MAX
UNITS
VOS
Input Offset Voltage
(Note 4)
±15V
±5V
±2.5V
0.5
0.5
0.7
1.5
1.5
1.8
mV
mV
mV
IOS
Input Offset Current
±2.5V to ±15V
120
350
nA
IB
Input Bias Current
±2.5V to ±15V
0.6
2.0
µA
en
Input Noise Voltage
f = 10kHz
±2.5V to ±15V
9
nV/√Hz
in
Input Noise Current
f = 10kHz
±2.5V to ±15V
RIN
Input Resistance
VCM = ±12V
±15V
Input Resistance
Differential
CIN
2
Input Capacitance
MIN
1
pA/√Hz
50
MΩ
±15V
5
MΩ
±15V
3
pF
12
LT1364/LT1365
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
TA = 25°C, VCM = 0V unless otherwise noted.
VSUPPLY
MIN
TYP
+
±15V
±5V
±2.5V
12.0
2.5
0.5
13.4
3.4
1.1
Input Voltage Range –
±15V
±5V
±2.5V
Input Voltage Range
CONDITIONS
VCM = ±12V
VCM = ±2.5V
VCM = ±0.5V
MAX
UNITS
V
V
V
–13.2 –12.0
–3.2 –2.5
–0.9 –0.5
V
V
V
±15V
±5V
±2.5V
84
76
66
90
81
71
90
100
dB
VOUT = ±12V, RL = 1k
VOUT = ±10V, RL = 500Ω
VOUT = ±7.5V, RL = 150Ω
VOUT = ±2.5V, RL = 500Ω
VOUT = ±2.5V, RL = 150Ω
VOUT = ±1V, RL = 500Ω
±15V
±15V
±15V
±5V
±5V
±2.5V
4.5
3.0
2.0
3.0
2.0
2.5
9.0
6.5
3.8
6.4
5.6
5.2
V/mV
V/mV
V/mV
V/mV
V/mV
V/mV
Output Swing
RL = 1k, VIN = ±40mV
RL = 500Ω, VIN = ±40mV
RL = 500Ω, VIN = ±40mV
RL = 150Ω, VIN = ±40mV
RL = 500Ω, VIN = ±40mV
±15V
±15V
±5V
±5V
±2.5V
13.5
13.0
3.5
3.4
1.3
14.0
13.7
4.1
3.8
1.7
±V
±V
±V
±V
±V
IOUT
Output Current
VOUT = ±7.5V
VOUT = ±3.4V
±15V
±5V
50
23
60
29
mA
mA
ISC
Short-Circuit Current
VOUT = 0V, VIN = ±3V
±15V
70
105
mA
SR
Slew Rate
AV = – 2, (Note 5)
±15V
±5V
750
300
1000
450
V/µs
V/µs
Full Power Bandwidth
10V Peak, (Note 6)
3V Peak, (Note 6)
±15V
±5V
15.9
23.9
MHz
MHz
GBW
Gain Bandwidth
f = 200kHz
±15V
±5V
±2.5V
70
50
40
MHz
MHz
MHz
tr, tf
Rise Time, Fall Time
AV = 1, 10%-90%, 0.1V
±15V
±5V
2.6
3.6
ns
ns
Overshoot
AV = 1, 0.1V
±15V
±5V
36
23
%
%
Propagation Delay
50% VIN to 50% VOUT, 0.1V
±15V
±5V
4.6
5.6
ns
ns
Settling Time
10V Step, 0.1%, AV = –1
10V Step, 0.01%, AV = –1
5V Step, 0.1%, AV = –1
±15V
±15V
±5V
50
80
55
ns
ns
ns
Differential Gain
f = 3.58MHz, AV = 2, RL = 150Ω
±15V
±5V
±15V
±5V
0.03
0.06
0.01
0.01
%
%
%
%
±15V
±5V
±15V
±5V
0.10
0.04
0.05
0.25
Deg
Deg
Deg
Deg
CMRR
Common Mode Rejection Ratio
PSRR
Power Supply Rejection Ratio
VS = ±2.5V to ±15V
AVOL
Large-Signal Voltage Gain
VOUT
ts
f = 3.58MHz, AV = 2, RL = 1k
Differential Phase
f = 3.58MHz, AV = 2, RL = 150Ω
f = 3.58MHz, AV = 2, RL = 1k
RO
IS
Output Resistance
AV = 1, f = 1MHz
±15V
Channel Separation
VOUT = ±10V, RL = 500Ω
±15V
Supply Current
Each Amplifier
Each Amplifier
±15V
±5V
50
35
100
dB
dB
dB
0.7
Ω
113
dB
6.3
6.0
7.5
7.2
mA
mA
3
LT1364/LT1365
ELECTRICAL CHARACTERISTICS
0°C ≤ TA ≤ 70°C, VCM = 0V unless otherwise noted.
The ● denotes the specifications which apply over the temperature range
SYMBOL
PARAMETER
CONDITIONS
VSUPPLY
MIN
VOS
Input Offset Voltage
(Note 4)
±15V
±5V
±2.5V
●
●
●
Input VOS Drift
(Note 7)
±2.5V to ±15V
●
TYP
10
MAX
UNITS
2.0
2.0
2.2
mV
mV
mV
13
µV/°C
IOS
Input Offset Current
±2.5V to ±15V
●
500
nA
IB
Input Bias Current
±2.5V to ±15V
●
3
µA
CMRR
Common Mode Rejection Ratio
±15V
±5V
±2.5V
●
●
●
PSRR
Power Supply Rejection Ratio
VS = ±2.5V to ±15V
●
88
dB
AVOL
Large-Signal Voltage Gain
VOUT = ±12V, RL = 1k
VOUT = ±10V, RL = 500Ω
VOUT = ±2.5V, RL = 500Ω
VOUT = ±2.5V, RL = 150Ω
VOUT = ±1V, RL = 500Ω
±15V
±15V
±5V
±5V
±2.5V
●
●
●
●
●
3.6
2.4
2.4
1.5
2.0
V/mV
V/mV
V/mV
V/mV
V/mV
VOUT
Output Swing
RL = 1k, VIN = ±40mV
RL = 500Ω, VIN = ±40mV
RL = 500Ω, VIN = ±40mV
RL = 150Ω, VIN = ±40mV
RL = 500Ω, VIN = ±40mV
±15V
±15V
±5V
±5V
±2.5V
●
●
●
●
●
13.4
12.8
3.4
3.3
1.2
±V
±V
±V
±V
±V
IOUT
Output Current
VOUT = ±12.8V
VOUT = ±3.3V
±15V
±5V
●
●
25
22
mA
mA
ISC
Short-Circuit Current
VOUT = 0V, VIN = ±3V
±15V
●
55
mA
SR
Slew Rate
AV = – 2, (Note 5)
±15V
±5V
●
●
600
225
V/µs
V/µs
GBW
Gain Bandwidth
f = 200kHz
±15V
±5V
●
●
44
31
MHz
MHz
Channel Separation
VOUT = ±10V, RL = 500Ω
±15V
●
98
dB
Supply Current
Each Amplifier
Each Amplifier
±15V
±5V
●
●
IS
VCM = ±12V
VCM = ±2.5V
VCM = ±0.5V
82
74
64
dB
dB
dB
8.7
8.4
mA
mA
The ● denotes the specifications which apply over the temperature range – 40°C ≤ TA ≤ 85°C, VCM = 0V unless otherwise noted. (Note 9)
SYMBOL
PARAMETER
CONDITIONS
VSUPPLY
VOS
Input Offset Voltage
(Note 4)
±15V
±5V
±2.5V
●
●
●
MIN
Input VOS Drift
(Note 7)
±2.5V to ±15V
●
TYP
10
MAX
UNITS
2.5
2.5
2.7
mV
mV
mV
13
µV/°C
IOS
Input Offset Current
±2.5V to ±15V
●
600
nA
IB
Input Bias Current
±2.5V to ±15V
●
3.6
µA
CMRR
Common Mode Rejection Ratio
VCM = ±12V
VCM = ±2.5V
VCM = ±0.5V
±15V
±5V
±2.5V
●
●
●
82
74
64
dB
dB
dB
PSRR
Power Supply Rejection Ratio
VS = ±2.5V to ±15V
●
87
dB
AVOL
Large-Signal Voltage Gain
VOUT = ±12V, RL = 1k
VOUT = ±10V, RL = 500Ω
VOUT = ±2.5V, RL = 500Ω
VOUT = ±2.5V, RL = 150Ω
VOUT = ±1V, RL = 500Ω
●
●
●
●
●
2.5
1.5
1.5
1.0
1.3
V/mV
V/mV
V/mV
V/mV
V/mV
4
±15V
±15V
±5V
±5V
±2.5V
LT1364/LT1365
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the temperature range
– 40°C ≤ TA ≤ 85°C, VCM = 0V unless otherwise noted. (Note 9)
SYMBOL
PARAMETER
CONDITIONS
VSUPPLY
VOUT
Output Swing
RL = 1k, VIN = ±40mV
RL = 500Ω, VIN = ±40mV
RL = 500Ω, VIN = ±40mV
RL = 150Ω, VIN = ±40mV
RL = 500Ω, VIN = ±40mV
±15V
±15V
±5V
±5V
±2.5V
●
●
●
●
●
13.4
12.7
3.4
3.2
1.2
±V
±V
±V
±V
±V
IOUT
Output Current
VOUT = ±12.7V
VOUT = ±3.2V
±15V
±5V
●
●
25
21
mA
mA
ISC
Short-Circuit Current
VOUT = 0V, VIN = ±3V
±15V
●
50
mA
SR
Slew Rate
AV = – 2, (Note 5)
±15V
±5V
●
●
550
180
V/µs
V/µs
GBW
Gain Bandwidth
f = 200kHz
±15V
±5V
●
●
43
30
MHz
MHz
Channel Separation
VOUT = ±10V, RL = 500Ω
±15V
●
98
dB
Supply Current
Each Amplifier
Each Amplifier
±15V
±5V
●
●
IS
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
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: Input offset voltage is pulse tested and is exclusive of warm-up drift.
Note 5: 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.
MIN
TYP
MAX
UNITS
9.0
8.7
mA
mA
Note 6: Full power bandwidth is calculated from the slew rate
measurement: FPBW = SR/2πVP.
Note 7: This parameter is not 100% tested.
Note 8: The LT1364C/LT1365C are guaranteed functional over the
operating temperature range of –40°C to 85°C.
Note 9: The LT1364C/LT1365C are guaranteed to meet specified
performance from 0°C to 70°C. The LT1364C/LT1365C 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. For
guaranteed I-grade parts, consult the factory.
U W
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Supply Voltage
and Temperature
V+
10
1.0
TA = 25°C
∆VOS < 1mV
–0.5
125°C
25°C
6
–55°C
4
2
–1.0
INPUT BIAS CURRENT (µA)
COMMON MODE RANGE (V)
8
SUPPLY CURRENT (mA)
Input Bias Current vs
Input Common Mode Voltage
Input Common Mode Range vs
Supply Voltage
–1.5
–2.0
2.0
1.5
1.0
0.8
VS = ±15V
TA = 25°C
IB+ + IB–
IB = ————
2
0.6
0.4
0.5
0
0
5
10
15
SUPPLY VOLTAGE (±V)
20
1364/1365 G01
V–
0
5
10
15
SUPPLY VOLTAGE (±V)
20
1364/1365 G02
0.2
–15
–10
–5
0
5
10
INPUT COMMON MODE VOLTAGE (V)
15
1364/1365 G03
5
LT1364/LT1365
U W
TYPICAL PERFORMANCE CHARACTERISTICS
Input Bias Current vs
Temperature
0.8
0.6
0.4
0.2
0
–50
en
in
10
1
1
–25
0
25
50
75
TEMPERATURE (°C)
100
10
125
100
OUTPUT VOLTAGE SWING (V)
10
78
77
76
75
TA = 25°C
RL = 1k
–1.5
RL = 500Ω
–2.0
2.0
100
RL = 500Ω
1.5
RL = 1k
1.0
0
5
10
15
SUPPLY VOLTAGE (±V)
Output Short-Circuit Current vs
Temperature
2.0
1.5
–40°C
1.0
Settling Time vs Output Step
(Inverting)
10
8
OUTPUT STEP (V)
120
110
SOURCE
100
SINK
90
4
10mV
80
125
1364/1365 G10
6
1mV
0
–2
–4
10mV
4
1mV
0
–2
–4
10mV
1mV
–6
–8
–8
–10
20
40
60
80
SETTLING TIME (ns)
100
1364/1365 G11
10mV
2
–10
0
VS = ±15V
AV = –1
RF = 1k
CF = 3pF
8
2
–6
100
–40°C
25°C
1364/1365 G09
VS = ±15V
AV = 1
RL = 1k
6
0
25
50
75
TEMPERATURE (°C)
20
10
VS = ±5V
–25
25°C
–2.0
Settling Time vs Output Step
(Noninverting)
130
70
–50
–1.5
1364/1365 G08
1364/1365 G07
140
85°C
–1.0
85°C
0.5
–
V
–50 –40 –30 –20 –10 0 10 20 30 40 50
OUTPUT CURRENT (mA)
–
125
VS = ±5V
VIN = 100mV
–0.5
–1.0
V
0
25
50
75
TEMPERATURE (°C)
10k
Output Voltage Swing vs
Load Current
0.5
–25
100
1k
LOAD RESISTANCE (Ω)
1364/1365 G06
OUTPUT STEP (V)
OPEN-LOOP GAIN (dB)
60
V+
–0.5
79
74
– 50
70
65
V+
VS = ±15V
VO = ±12V
RL = 1k
VS = ±5V
75
Output Voltage Swing vs
Supply Voltage
81
80
VS = ±15V
1364/1365 G05
Open-Loop Gain vs Temperature
OUTPUT SHORT-CIRCUIT CURRENT (mA)
80
0.1
100k
1k
10k
FREQUENCY (Hz)
1364/1365 G04
6
TA = 25°C
OPEN-LOOP GAIN (dB)
1.0
85
OUTPUT VOLTAGE SWING (V)
INPUT BIAS CURRENT (µA)
VS = ±15V
TA = 25°C
AV = 101
RS = 100k
INPUT CURRENT NOISE (pA/√Hz)
1.2
10
100
VS = ±15V
IB+ + IB–
IB = ————
2
INPUT VOLTAGE NOISE (nV/√Hz)
1.4
Open-Loop Gain vs
Resistive Load
Input Noise Spectral Density
0
20
1mV
40
60
80
SETTLING TIME (ns)
100
1364/1365 G12
LT1364/LT1365
U W
TYPICAL PERFORMANCE CHARACTERISTICS
PHASE
60
AV = 100
VS = ±15V
50
GAIN
GAIN (dB)
1
AV = 10
VS = ±5V
20
10
0.1
0
1M
10M
FREQUENCY (Hz)
100M
100k
1M
10M
FREQUENCY (Hz)
40
6
35
30
90
80
GAIN BANDWIDTH
VS = ±15V
70
25
20
5
–8
0
25
50
75
TEMPERATURE (°C)
100
±5V
–4
–6
–25
±15V
–2
10
±2.5V
–10
100k
0
125
1M
10M
FREQUENCY (Hz)
Gain Bandwidth and Phase
Margin vs Supply Voltage
100
44
PHASE MARGIN
90
42
80
40
70
38
60
36
50
34
GAIN BANDWIDTH
40
32
30
30
0
5
10
15
SUPPLY VOLTAGE (±V)
20
1364/1365 G15
POWER SUPPLY REJECTION RATIO (dB)
46
PHASE MARGIN (DEG)
GAIN BANDWIDTH (MHz)
110
C = 100pF
C = 50pF
3
C=0
0
–3
–6
–9
–12
–15
1M
100M
Common Mode Rejection Ratio
vs Frequency
120
+PSRR
80
VS = ±15V
TA = 25°C
– PSRR
60
40
20
0
100
100M
10M
FREQUENCY (Hz)
1364/1365 G18
100
48
TA = 25°C
C = 500pF
6
Power Supply Rejection Ratio
vs Frequency
50
120
9
C = 1000pF
1364/1365 G17
1364/1365 G16
130
VS = ±15V
TA = 25°C
AV = –1
12
0
50
30
– 50
15
TA = 25°C
AV = 1
RL = 1k
2
15
GAIN BANDWIDTH
VS = ± 5V
100M
Frequency Response vs
Capacitive Load
4
60
40
1M
10M
FREQUENCY (Hz)
1364/1365 G21
VOLTAGE MAGNITUDE (dB)
8
GAIN (dB)
GAIN BANDWIDTH (MHz)
45
PHASE MARGIN (DEG)
PHASE MARGIN
VS = ±15V
VS = ±5V
RL = 500Ω
–120
100k
100M
10
50
110
VS = ±15V
RL = 1k
– 90
Frequency Response vs
Supply Voltage (AV = 1)
PHASE MARGIN
VS = ± 5V
100
–70
– 80
1364/1365 G14
Gain Bandwidth and Phase
Margin vs Temperature
120
– 60
–110
1364/1365 G13
130
– 50
–100
COMMON-MODE REJECTION RATIO (dB)
100k
–10
10k
TA = 25°C
AV = 1
VIN = 0dBm
– 40
TA = 25°C
AV = –1
RF = RG = 1k
0
0.01
10k
– 30
40
20
AV = 1
100
60
VS = ±5V
30
– 20
80
VS = ±15V
40
120
PHASE (DEG)
OUTPUT IMPEDANCE (Ω)
VS = ±15V
TA = 25°C
10
Crosstalk vs Frequency
Gain and Phase vs Frequency
70
CROSSTALK (dB)
Output Impedance vs Frequency
100
VS = ±15V
TA = 25°C
100
80
60
40
20
0
1k
10k 100k
1M
FREQUENCY (Hz)
10M
100M
1364/1365 G19
1k
10k
100k
1M
FREQUENCY (Hz)
10M
100M
1364/1365 G20
7
LT1364/LT1365
U W
TYPICAL PERFORMANCE CHARACTERISTICS
Slew Rate vs Temperature
Slew Rate vs Supply Voltage
2400
1800
1600
AV = –2
SR+ + SR–
SR = —————
2
1200
SLEW RATE (V/µs)
2000
1400
1200
1000
800
1600
1000
VS = ±15V
800
600
1400
1200
1000
VS = ±5V
600
400
5
10
SUPPLY VOLTAGE (±V)
200
–50
15
0
–25
0
25
50
75
TEMPERATURE (°C)
1364/1365 G22
AV = 1
AV = 1
20
15
10
5
0.0001
VS = ±15V
RL = 1k
AV = 1, 1% MAX DISTORTION
AV = –1, 2% MAX DISTORTION
0
100k
100k
DIFFERENTIAL GAIN
–90
–100
100k 200k
400k
1M 2M
FREQUENCY (Hz)
4M
10M
1364/1365 G28
DIFFERENTIAL PHASE (DEG)
HARMONIC DISTORTION (dB)
0.1
3RD HARMONIC
–80
VS = ±5V
RL = 1k
2% MAX DISTORTION
1M
FREQUENCY (Hz)
0
0.3
0.2
DIFFERENTIAL PHASE
0.1
0.0
Capacitive Load Handling
100
TA = 25°C
VS = ±15V
±10
SUPPLY VOLTAGE (V)
AV = –1
50
AV = 2
RL = 150Ω
TA = 25°C
±5
10M
1364/1365 G27
DIFFERENTIAL GAIN (%)
Differential Gain and Phase
vs Supply Voltage
0.2
2ND HARMONIC
4
0
100k
10M
–40
–70
AV = 1
6
1364/1365 G26
2nd and 3rd Harmonic Distortion
vs Frequency
20
AV = –1
8
2
1M
FREQUENCY (Hz)
1364/1365 G25
VS = ±15V
VO = 2VP-P
RL = 500Ω
AV = 2
6 8 10 12 14 16 18
INPUT LEVEL (VP-P)
10
AV = –1
OUTPUT VOLTAGE (VP-P)
AV = –1
1k
10k
FREQUENCY (Hz)
4
Undistorted Output Swing vs
Frequency (±5V)
25
OUTPUT VOLTAGE (VP-P)
TOTAL HARMONIC DISTORTION (%)
30
TA = 25°C
VO = 3VRMS
RL = 500Ω
100
2
1364/1365 G24
Undistorted Output Swing vs
Frequency (±15V)
0.01
10
0
125
1364/1365 G23
Total Harmonic Distortion
vs Frequency
0.001
100
OVERSHOOT (%)
0
8
600
200
0
–60
800
400
400
200
–50
TA = 25°C
VS = ±15V
AV = –1
RF = RG = 1k
SR+ + SR –
SR = —————
2
1800
SLEW RATE (V/µS)
TA = 25°C
AV = –1
RF = RG = 1k
SR+ + SR–
SR = —————
2
2200
SLEW RATE (V/µs)
Slew Rate vs Input Level
2000
1400
AV = 1
±15
1364/1365 G29
0
10p
100p
1000p 0.01µ
0.1µ
CAPACITIVE LOAD (F)
1µ
1364/1365 G30
LT1364/LT1365
U W
TYPICAL PERFORMANCE CHARACTERISTICS
Small-Signal Transient
(AV = 1)
Small-Signal Transient
(AV = –1)
1364/1365 TA31
Small-Signal Transient
(AV = –1, CL = 200pF)
1364/1365 TA33
1364/1365 TA32
Large-Signal Transient
(AV = 1)
Large-Signal Transient
(AV = –1)
1364/1365 TA34
Large-Signal Transient
(AV = 1, CL = 10,000pF)
1364/1365 TA35
1364/1365 TA36
U
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U
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APPLICATIONS INFORMATION
Layout and Passive Components
Input Considerations
The LT1364/LT1365 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).
Each of the LT1364/LT1365 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.
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 5kΩ are
used, a parallel capacitor of value
CF > RG x CIN/RF
should be used to cancel the input pole and optimize
dynamic performance. For unity-gain applications where
a large feedback resistor is used, CF should be greater
than or equal to CIN.
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
9
LT1364/LT1365
U
W
U
U
APPLICATIONS INFORMATION
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.
Capacitive Loading
The LT1364/LT1365 are stable with any capacitive load.
This is accomplished by sensing the load induced output
pole and adding compensation at the amplifier gain node.
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 as shown
in the typical performance curves. The photo of the small
signal response with 200pF load shows 62% peaking. The
large signal response shows the output slew rate being
limited to 10V/µs by the short-circuit current. 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.
Circuit Operation
The LT1364/LT1365 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 a 500Ω 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
10
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 LT1364/LT1365 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.
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 LT1364/LT1365 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 (TJ) is calculated from the ambient
temperature (TA) and power dissipation (PD) as follows:
LT1364CN8:
LT1364CS8:
LT1365CN:
LT1365CS:
TJ = TA + (PD x 130°C/W)
TJ = TA + (PD x 190°C/W)
TJ = TA + (PD x 110°C/W)
TJ = TA + (PD x 150°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 PDMAX is:
PDMAX = (V+ – V–)(ISMAX) + (V+/2)2/RL
Example: LT1365 in S16 at 70°C, VS = ±5V, RL = 150W
PDMAX = (10V)(8.4mA) + (2.5V)2/150Ω = 126mW
TJMAX = 70°C + (4 x 126mW)(150°C/W) = 145°C
LT1364/LT1365
W
W
SI PLIFIED SCHE ATIC
V+
R1
500Ω
+IN
CC
RC
OUT
–IN
C
V–
1364/1365 SS01
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PACKAGE DESCRIPTION
Dimension in inches (millimeters) unless otherwise noted.
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.300 – 0.325
(7.620 – 8.255)
0.045 – 0.065
(1.143 – 1.651)
(
+0.035
0.325 –0.015
+0.889
8.255
–0.381
0.130 ± 0.005
(3.302 ± 0.127)
0.065
(1.651)
TYP
0.009 – 0.015
(0.229 – 0.381)
)
0.400*
(10.160)
MAX
8
7
6
5
1
2
3
4
0.255 ± 0.015*
(6.477 ± 0.381)
0.125
(3.175) 0.020
MIN (0.508)
MIN
0.018 ± 0.003
0.100
(2.54)
BSC
(0.457 ± 0.076)
N8 1098
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
N Package
14-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.130 ± 0.005
(3.302 ± 0.127)
0.300 – 0.325
(7.620 – 8.255)
0.045 – 0.065
(1.143 – 1.651)
0.020
(0.508)
MIN
0.065
(1.651)
TYP
0.009 – 0.015
(0.229 – 0.381)
+0.035
0.325 –0.015
0.005
(0.125)
MIN 0.100
(2.54)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
BSC
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
(
8.255
+0.889
–0.381
)
0.770*
(19.558)
MAX
0.125
(3.175)
MIN
0.018 ± 0.003
(0.457 ± 0.076)
14
13
12
11
10
9
8
1
2
3
4
5
6
7
0.255 ± 0.015*
(6.477 ± 0.381)
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.
N14 1098
11
LT1364/LT1365
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TYPICAL APPLICATIONS
Two Op Amp Instrumentation Amplifier
R5
220Ω
R1
10k
2MHz, 4th Order Butterworth Filter
R4
10k
464Ω
R2
1k
22pF
464Ω
R3
1k
–
1/2
LT1364
1.33k
VIN
–
220pF
1/2
LT1364
+
–
549Ω
47pF
–
1.13k
549Ω
1/2
LT1364
+
VOUT
–
470pF
+
(
R4 1 R2 R3 R2 + R3
GAIN = 1 +
+
+
R5
R3 2 R1 R4
VOUT
+
+
VIN
1/2
LT1364
1364/1365 TA04
) = 102
TRIM R5 FOR GAIN
TRIM R1 FOR COMMON-MODE REJECTION
BW = 700kHz
1364/1365 TA01
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PACKAGE DESCRIPTION
Dimension in inches (millimeters) unless otherwise noted.
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 – 0.197*
(4.801 – 5.004)
0.010 – 0.020
× 45°
(0.254 – 0.508)
0.008 – 0.010
(0.203 – 0.254)
7
8
0.053 – 0.069
(1.346 – 1.752)
5
6
0.004 – 0.010
(0.101 – 0.254)
0°– 8° TYP
0.016 – 0.050
(0.406 – 1.270)
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
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
0.050
(1.270)
BSC
1
3
2
4
SO8 1298
S Package
16-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.386 – 0.394*
(9.804 – 10.008)
0.010 – 0.020
× 45°
(0.254 – 0.508)
0.008 – 0.010
(0.203 – 0.254)
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
16
15
14
13
12
11
10
9
0° – 8° TYP
0.014 – 0.019
0.016 – 0.050
(0.355 – 0.483)
(0.406 – 1.270)
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
0.228 – 0.244
(5.791 – 6.197)
0.050
(1.270)
BSC
0.150 – 0.157**
(3.810 – 3.988)
1
2
3
4
5
6
7
8
S16 1098
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1363
70MHz, 1000V/µs Op Amp
Single Version of LT1364/LT1365
LT1361/LT1362
Dual and Quad 50MHz, 800V/µs Op Amps
Lower Power Version of LT1364/LT1365, VOS = 1mV, 4mA/Amplifier
LT1358/LT1359
Dual and Quad 25MHz, 600V/µs Op Amps
Lower Power Version of LT1364/LT1365, VOS = 0.6mV, 2mA/Amplifier
LT1813
Dual 100MHz, 700V/µs Op Amps
Low Voltage, Low Power LT1364/LT1365, 3mA/Amplifier
12
Linear Technology Corporation
13645fa LT/TP 0400 2K REV A • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 ● FAX: (408) 434-0507 ● www.linear-tech.com
LINEAR TECHNOLOGY CORPORATION 1994
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