LT1363
70MHz, 1000V/µs Op Amp
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DESCRIPTIO
FEATURES
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70MHz Gain Bandwidth
1000V/µs Slew Rate
7.5mA Maximum Supply Current
9nV/√Hz Input Noise Voltage
Unity-Gain Stable
C-LoadTM Op Amp Drives All Capacitive Loads
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 LT1363 is a member of a family of fast, high performance amplifiers using this unique topology and
employing Linear Technology Corporation’s advanced
bipolar complementary processing. For dual and quad
amplifier versions of the LT1363 see the LT1364/1365
data sheet. For 50MHz amplifiers with 4mA of supply
current per amplifier see the LT1360 and LT1361/1362
data sheets. For lower supply current amplifiers with
bandwidths of 12MHz and 25MHz see the LT1354 through
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 LT1363 is a high speed, very high slew rate operational amplifier with excellent DC performance. The LT1363
features reduced supply current, lower input offset voltage, lower input bias current and higher DC gain than
devices with comparable bandwidth. The circuit topology
is a voltage feedback amplifier with the slewing characteristics of a current feedback amplifier. The amplifier is a
single gain stage with outstanding settling characteristics
which makes the circuit an ideal choice for data acquisition
systems. The output drives a 150Ω load to ±7.5V with
±15V supplies and to ±3.4V on ±5V supplies. The amplifier
is also capable of driving any capacitive load which makes
it useful in buffer or cable driver 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
+
LT1363
–
510Ω
–6
75Ω
OUT
75Ω
510Ω
–8
1
10
FREQUENCY (MHz)
100
1363 TA02
1363 TA01
1
LT1363
W W
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ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage (V+ to
V –) ...............................
(Note 1)
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
1
8
NULL
–IN 2
7
V+
+IN 3
6
VOUT
V– 4
5
NC
NULL
ORDER PART
NUMBER
LT1363CN8
ORDER PART
NUMBER
TOP VIEW
NULL 1
8
NULL
–IN 2
7
V+
+IN 3
6
VOUT
V– 4
5
NC
LT1363CS8
S8 PART MARKING
1363
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 130°C/ W
TJMAX = 150°C, θJA = 190°C/ W
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
TA = 25°C, VCM = 0V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
VSUPPLY
VOS
Input Offset Voltage
(Note 4)
IOS
Input Offset Current
IB
Input Bias Current
en
Input Noise Voltage
f = 10kHz
in
Input Noise Current
f = 10kHz
±2.5V to ±15V
RIN
Input Resistance
VCM = ±12V
±15V
Input Resistance
Differential
CIN
Input Capacitance
MAX
UNITS
±15V
±5V
±2.5V
0.5
0.5
0.7
1.5
1.5
1.8
mV
mV
mV
±2.5V to ±15V
120
350
nA
±2.5V to ±15V
0.6
2.0
±2.5V to ±15V
9
nV/√Hz
1
pA/√Hz
MΩ
±15V
5
MΩ
±15V
3
pF
13.4
3.4
1.1
V
V
V
Input Voltage Range –
±15V
±5V
±2.5V
Common Mode Rejection Ratio
VCM = ±12V
VCM = ±2.5V
VCM = ±0.5V
PSRR
Power Supply Rejection Ratio
VS = ±2.5V to ±15V
AVOL
Large-Signal Voltage Gain
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
µA
50
±15V
±5V
±2.5V
CMRR
2
TYP
Range +
Input Voltage
MIN
±15V
±5V
±2.5V
±15V
±15V
±15V
±5V
±5V
±2.5V
12
12.0
2.5
0.5
–13.2 –12.0
–3.2 –2.5
–0.9 –0.5
V
V
V
84
76
66
90
81
71
dB
dB
dB
90
100
dB
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
LT1363
ELECTRICAL CHARACTERISTICS
TA = 25°C, VCM = 0V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
VSUPPLY
MIN
TYP
MAX
UNITS
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
13.5
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 = 1MHz
±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
±15V
0.7
Ω
±15V
±5V
6.3
6.0
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
Output Resistance
IS
Supply Current
AV = 1, f = 1MHz
7.5
7.2
mA
mA
The ● denotes the specifications which apply over the temperature range 0°C ≤ TA ≤ 70°C, VCM = 0V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
VSUPPLY
VOS
Input Offset Voltage
(Note 4)
±15V
±5V
±2.5V
●
●
●
Input VOS Drift
(Note 7)
±2.5V to ±15V
●
±2.5V to ±15V
●
±2.5V to ±15V
●
±15V
±5V
±2.5V
●
●
●
IOS
Input Offset Current
IB
Input Bias Current
CMRR
Common Mode Rejection Ratio
VCM = ±12V
VCM = ±2.5V
VCM = ±0.5V
MIN
TYP
10
82
74
64
MAX
UNITS
2.0
2.0
2.2
mV
mV
mV
13
µV/°C
500
nA
3
µA
dB
dB
dB
3
LT1363
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
TYP
MAX
UNITS
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
IS
Supply Current
±15V
±5V
●
●
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
±15V
±15V
±5V
±5V
±2.5V
●
●
●
●
●
2.5
1.5
1.5
1.0
1.3
V/mV
V/mV
V/mV
V/mV
V/mV
VOUT
Output Swing
RL = 1kΩ, 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
IS
Supply Current
±15V
±5V
●
●
4
9.0
8.7
mA
mA
LT1363
ELECTRICAL CHARACTERISTICS
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 ±2V on the output with ±1.75V input for ±5V supplies.
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 LT1363C is guaranteed functional over the operating
temperature range of –40°C to 85°C.
Note 9: The LT1363C is guaranteed to meet specified performance from
0°C to 70°C. The LT1363C is designed, characterized and expected to
meet specified performance from – 40°C to 85°C, but is not tested or QA
sampled at these temperatures. For guaranteed I-grade parts, consult the
factory.
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TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Supply Voltage
and Temperature
V+
10
1.0
125°C
25°C
6
–55°C
4
2
–1.0
INPUT BIAS CURRENT (µA)
COMMON MODE RANGE (V)
8
VS = ±15V
TA = 25°C
IB+ + IB–
IB = ————
2
TA = 25°C
∆VOS < 1mV
– 0.5
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
0.6
0.4
0.5
V–
0
5
10
15
SUPPLY VOLTAGE (±V)
20
0
5
10
15
SUPPLY VOLTAGE (±V)
1363 G01
0.8
0.6
0.4
0.2
INPUT VOLTAGE NOISE (nV/√Hz)
INPUT BIAS CURRENT (µA)
10
VS = ±15V
TA = 25°C
AV = 101
RS = 100k
in
10
0
25
50
75
TEMPERATURE (°C)
100
125
1363 G04
10
TA = 25°C
en
1
1
–25
100
1k
10k
FREQUENCY (Hz)
85
0.1
100k
1363 G05
INPUT CURRENT NOISE (pA/√Hz)
1.0
0
– 50
Open-Loop Gain vs
Resistive Load
100
1.2
15
1363 G03
Input Noise Spectral Density
VS = ±15V
IB+ + IB–
IB = ————
2
–10
–5
0
5
10
INPUT COMMON MODE VOLTAGE (V)
1363 G02
Input Bias Current vs
Temperature
1.4
0.2
–15
20
80
OPEN-LOOP GAIN (dB)
0
VS = ±15V
VS = ±5V
75
70
65
60
10
100
1k
LOAD RESISTANCE (Ω)
10k
1363 G06
5
LT1363
U W
TYPICAL PERFORMANCE CHARACTERISTICS
Output Voltage Swing vs
Supply Voltage
Open-Loop Gain vs Temperature
V+
V+
RL = 1k
VO = ±12V
VS = ±15V
–0.5
OUTPUT VOLTAGE SWING (V)
80
79
78
77
76
TA = 25°C
–0.5
RL = 1k
–1.0
–1.5
RL = 500Ω
–2.0
2.0
RL = 500Ω
1.5
RL = 1k
1.0
75
0.5
74
– 50
–25
0
25
50
75
TEMPERATURE (°C)
100
0
125
5
10
15
SUPPLY VOLTAGE (±V)
20
OUTPUT IMPEDANCE (Ω)
SINK
90
0
25
50
75
TEMPERATURE (°C)
100
AV = 100
10
1
AV = 10
AV = 1
0.01
10k
125
100k
1M
10M
FREQUENCY (Hz)
30
20
20
1mV
0
–2
–4
10mV
4
10mV
0
–2
–4
1mV
42
80
40
70
38
60
36
50
–8
40
–10
30
40
60
80
SETTLING TIME (ns)
100
1363 G13
0
20
40
60
80
SETTLING TIME (ns)
100
1363 G12
44
PHASE MARGIN
90
–8
20
46
100
–10
0
48
TA = 25°C
110
1mV
–6
50
120
2
10mV
1mV
130
GAIN BANDWIDTH (MHz)
OUTPUT STEP (V)
6
2
–6
VS = ±15V
AV = –1
RF = 1k
CF = 3pF
8
100M
1M
10M
FREQUENCY (Hz)
34
GAIN BANDWIDTH
32
30
0
5
10
15
SUPPLY VOLTAGE (±V)
20
1363 G15
PHASE MARGIN (DEG)
10mV
100k
Gain Bandwidth and Phase
Margin vs Supply Voltage
10
4
0
TA = 25°C
AV = –1
RF = RG = 1k
1363 G14
Settling Time vs Output Step
(Inverting)
VS = ±15V
AV = 1
RL = 1k
6
40
VS = ±5V
1363 G11
10
60
VS = ±5V
–10
10k
100M
80
VS = ±15V
40
10
0.1
100
VS = ±15V
GAIN
Settling Time vs Output Step
(Noninverting)
6
120
50
1363 G10
8
– 40°C
1.0
PHASE
0
–25
1.5
60
80
70
– 50
2.0
Gain and Phase vs Frequency
VS = ±15V
TA = 25°C
130
SOURCE
–40°C
25°C
70
GAIN (dB)
VS = ±5V
100
25°C
–2.0
PHASE (DEG)
OUTPUT SHORT-CIRCUIT CURRENT (mA)
100
110
–1.5
1363 G09
Output Impedance vs
Frequency
120
85°C
–1.0
1363 G08
Output Short-Circuit Current vs
Temperature
140
VS = ±5V
VIN = 100mV
85°C
0.5
V–
–50 –40 –30 –20 –10 0 10 20 30 40 50
OUTPUT CURRENT (mA)
V–
1363 G07
OUTPUT STEP (V)
OUTPUT VOLTAGE SWING (V)
81
OPEN-LOOP GAIN (dB)
Output Voltage Swing vs
Load Current
LT1363
U W
TYPICAL PERFORMANCE CHARACTERISTICS
Gain Bandwidth and Phase
Margin vs Temperature
120
PHASE MARGIN
VS = ±15V
100
10
45
8
40
6
35
90
30
80
GAIN BANDWIDTH
VS = ±15V
70
60
25
20
15
50
GAIN BANDWIDTH
VS = ±5V
40
30
–50
–25
0
25
50
75
TEMPERATURE (°C)
100
PHASE MARGIN (DEG)
5
TA = 25°C
AV = 1
RL = 1k
0
10
–6
5
–8
–3
±2.5V
1M
10M
FREQUENCY (Hz)
–5
100k
100M
9
C = 500pF
C = 100pF
6
C = 50pF
3
C=0
0
–3
–6
–9
–12
–15
1M
10M
FREQUENCY (Hz)
POWER SUPPLY REJECTION RATIO (dB)
12
120
80
– PSRR
60
40
20
0
100
100M
Slew Rate vs Supply Voltage
10k 100k
1M
FREQUENCY (Hz)
10M
60
40
20
100M
1k
1200
1000
800
10M
100M
Slew Rate vs Input Level
AV = –2
SR+ + SR–
SR = —————
2
1600
VS = ±15V
800
TA = 25°C
VS = ±15V
AV = –1
RF = RG = 1k
SR+ + SR –
SR = —————
2
1800
1000
600
VS = ± 5V
600
400
100k
1M
FREQUENCY (Hz)
2000
1200
1400
10k
1363 G21
SLEW RATE (V/µS)
1600
80
Slew Rate vs Temperature
SLEW RATE (V/µs)
1800
100
0
1k
1400
TA = 25°C
AV = –1
RF = RG = 1k
SR+ + SR–
SR = —————
2
VS = ±15V
TA = 25°C
1363 G20
2400
2000
100M
Common Mode Rejection Ratio
vs Frequency
VS = ±15V
TA = 25°C
+PSRR
1363 G19
2200
1M
10M
FREQUENCY (Hz)
1363 G18
100
C = 1000pF
±2.5V
–4
Power Supply Rejection Ratio
vs Frequency
15
VS = ±15V
TA = 25°C
AV = –1
±5V
1363 G17
Frequency Response vs
Capacitive Load
VOLTAGE MAGNITUDE (dB)
0
–1
–2
1363 G16
SLEW RATE (V/µs)
1
±5V
–10
100k
±15V
2
2
–4
0
125
3
±15V
4
–2
TA = 25°C
AV = –1
RF = RG = 1k
4
COMMON-MODE REJECTION RATIO (dB)
GAIN BANDWIDTH (MHz)
110
50
GAIN (dB)
PHASE MARGIN
VS = ±5V
GAIN (dB)
130
Frequency Response vs
Supply Voltage (AV = –1)
Frequency Response vs
Supply Voltage (AV = 1)
1400
1200
1000
800
600
400
400
200
200
0
0
5
10
SUPPLY VOLTAGE (±V)
15
1363 G22
200
– 50
0
–25
0
25
50
75
TEMPERATURE (°C)
100
125
1363 G23
0
2
4
6 8 10 12 14 16 18
INPUT LEVEL (VP-P)
20
1363 G24
7
LT1363
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TYPICAL PERFORMANCE CHARACTERISTICS
Total Harmonic Distortion
vs Frequency
30
TA = 25°C
VO = 3VRMS
RL = 500Ω
20
15
10
5
0.0001
100
1k
10k
FREQUENCY (Hz)
VS = ±15V
RL = 1k
AV = 1, 1% MAX DISTORTION
AV = –1, 2% MAX DISTORTION
0
100k
100k
OUTPUT VOLTAGE (VP-P)
AV = 1
AV = 1
1M
FREQUENCY (Hz)
3RD HARMONIC
DIFFERENTIAL GAIN
2ND HARMONIC
–80
–90
–100
100k 200k
400k
1M 2M
FREQUENCY (Hz)
4M
10M
DIFFERENTIAL PHASE (DEG)
HARMONIC DISTORTION (dB)
0.1
–70
0
0.3
0.2
DIFFERENTIAL PHASE
0.1
0.0
8
TA = 25°C
VS = ±15V
±5
±10
SUPPLY VOLTAGE (V)
AV = –1
50
AV = 1
±15
0
10p
100p
1000p 0.01µ
0.1µ
CAPACITIVE LOAD (F)
1µ
1363 G30
1363 G29
Small-Signal Transient
(AV = –1)
1363 TA31
10M
100
AV = 2
RL = 150Ω
TA = 25°C
1363 G28
Small-Signal Transient
(AV = 1)
1M
FREQUENCY (Hz)
Capacitive Load Handling
0.2
DIFFERENTIAL GAIN (%)
–60
VS = ±5V
RL = 1k
2% MAX DISTORTION
1363 G27
Differential Gain and Phase
vs Supply Voltage
–40
VS = ±15V
VO = 2VP-P
RL = 500Ω
AV = 2
4
1363 G26
2nd and 3rd Harmonic Distortion
vs Frequency
–50
AV = 1
6
0
100k
10M
1363 G25
AV = –1
8
2
OVERSHOOT (%)
AV = –1
10
10
AV = –1
25
OUTPUT VOLTAGE (VP-P)
TOTAL HARMONIC DISTORTION (%)
0.01
0.001
Undistorted Output Swing vs
Frequency (±5V)
Undistorted Output Swing vs
Frequency (±15V)
Small-Signal Transient
(AV = –1, CL = 200pF)
1363 TA32
1363 TA33
LT1363
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TYPICAL PERFORMANCE CHARACTERISTICS
Large-Signal Transient
(AV = 1)
Large-Signal Transient
(AV = 1, CL = 10,000pF)
Large-Signal Transient
(AV = –1)
1363 TA34
1363 TA35
1363 TA36
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APPLICATIONS INFORMATION
The LT1363 may be inserted directly into AD817, AD847,
EL2020, EL2044, and LM6361 applications improving
both DC and AC performance, provided that the nulling
circuitry is removed. The suggested nulling circuit for the
LT1363 is shown below.
Offset Nulling
The parallel combination of the feedback resistor and gain
setting resistor on the inverting input can combine with
the input capacitance to form a pole which can cause
peaking or oscillations. For feedback resistors greater
than 5kΩ, a parallel capacitor of value
CF > RG x CIN/RF
V+
3
7
+
6
LT1363
2
4
–
8
1
10k
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.
Capacitive Loading
V–
1363 AI01
Layout and Passive Components
The LT1363 amplifier is easy to apply and tolerant of less
than ideal layouts. For maximum performance (for example fast settling time) 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). Sockets
should be avoided when maximum frequency performance is required, although low profile sockets can
provide reasonable performance up to 50MHz. For
more details see Design Note 50.
The LT1363 is 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 largesignal response with a 10,000pF load 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. The
response of a cable driver in a gain of 2 driving a 75Ω cable
is shown on the front page of the data sheet.
9
LT1363
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APPLICATIONS INFORMATION
Input Considerations
Each of the LT1363 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 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.
Single Supply Operation
The LT1363 is specified at ±15V, ±5V, and ±2.5V supplies,
but it is also well suited to single supply operation down
to a single 5V supply. The symmetrical input Ccmmon
mode range and output swing make the device well suited
for applications with a single supply if the the input and
output swing ranges are centered (i.e., a DC bias of 2.5V
on the input and the output). For 5V video applications
with an assymetrical swing, an offset of 2V on the input
works best.
Power Dissipation
The LT1363 combines high speed and large output drive
in a small package. Because of the wide supply voltage
range, it is possible to exceed the maximum junction
10
temperature under certain conditions. Maximum junction
temperature (TJ) is calculated from the ambient temperature (TA) and power dissipation (PD) as follows:
LT1363CN8: TJ = TA + (PD x 130°C/W)
LT1363CS8: TJ = TA + (PD x 190°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). Therefore PDMAX is:
PDMAX = (V+ – V –)(ISMAX) + (V+/2)2/RL
Example: LT1363CS8 at 70°C, VS = ±15V, RL = 390Ω
PDMAX = (30V)(8.7mA) + (7.5V)2/390Ω = 405mW
TJMAX = 70°C + (405mW)(190°C/W) = 147°C
Circuit Operation
The LT1363 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
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 LT1363 is 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.
LT1363
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APPLICATIONS INFORMATION
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.
Comparison to Current Feedback Amplifiers
tics of a true voltage feedback amplifier. The primary
differences are that the LT1363 has two high impedance
inputs and its closed loop bandwidth decreases as the gain
increases. CFAs have a low impedance inverting input and
maintain relatively constant bandwidth with increasing
gain. The LT1363 can be used in all traditional op amp
configurations including integrators and applications such
as photodiode amplifiers and I-to-V converters where
there may be significant capacitance on the inverting
input. The frequency compensation is internal and not
dependent on the value of the feedback resistor. For CFAs,
the feedback resistance is fixed for a given bandwidth and
capacitance on the inverting input can cause peaking or
oscillations. The slew rate of the LT1363 in noninverting
gain configurations is also superior in most cases.
The LT1363 enjoys the high slew rates of Current Feedback Amplifiers (CFAs) while maintaining the characteris-
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SI PLIFIED SCHE ATIC
V+
R1
500Ω
+IN
RC
OUT
–IN
C
CC
V–
1363 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)
0.009 – 0.015
(0.229 – 0.381)
(
+0.035
0.325 –0.015
+0.889
8.255
–0.381
)
0.045 – 0.065
(1.143 – 1.651)
0.400*
(10.160)
MAX
0.130 ± 0.005
(3.302 ± 0.127)
0.065
(1.651)
TYP
8
7
6
5
1
2
3
4
0.255 ± 0.015*
(6.477 ± 0.381)
0.100
(2.54)
BSC
0.125
(3.175) 0.020
MIN (0.508)
MIN
0.018 ± 0.003
(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)
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.
11
LT1363
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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
47pF
22pF
464Ω
1.33k
–
VIN
R3
1k
–
–
LT1363
+
–
549Ω
1.13k
+
VOUT
LT1363
549Ω
LT1363
220pF
+
(
R4 1 R2 R3 R2 + R3
GAIN = 1 +
+
+
R5
R3 2 R1 R4
TRIM R5 FOR GAIN
TRIM R1 FOR COMMON-MODE REJECTION
BW = 700kHz
LT1363
VOUT
+
+
VIN
–
470pF
1363 TA04
) = 102
1363 TA03
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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)
0.053 – 0.069
(1.346 – 1.752)
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
8
7
6
5
0.004 – 0.010
(0.101 – 0.254)
0.050
(1.270)
BSC
0.150 – 0.157**
(3.810 – 3.988)
0.228 – 0.244
(5.791 – 6.197)
1
2
3
4
SO8 1298
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1364/LT1365
Dual and Quad 70MHz, 1000V/µs Op Amps
Dual and Quad Versions of LT1363
LT1360
50MHz, 800V/µs Op Amp
Lower Power Version of LT1363, VOS = 1mV, IS = 4mA
LT1357
25MHz, 600V/µs Op Amp
Lower Power Version of LT1363, VOS = 0.6mV, IS = 2mA
LT1812
100MHz, 750V/µs Op Amp
Low Voltage, Low Power LT1363, VOS = 1.5mV, IS = 3mA
12
Linear Technology Corporation
1363fa 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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