LT1352/LT1353
Dual and Quad
250µA, 3MHz, 200V/µs
Operational Amplifiers
DESCRIPTIO
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FEATURES
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The LT ®1352/LT1353 are dual and quad, very 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 combines the slewing
performance of a current feedback amplifier in a true
operational amplifier with matched high impedance
inputs. The high slew rate ensures that the large-signal
bandwidth is not degraded. Each output is capable of
driving a 1kΩ load to ±13V with ±15V supplies and a 500Ω
load to ±3.4V on ±5V supplies.
3MHz Gain Bandwidth
200V/µs Slew Rate
250µA Supply Current per Amplifier
C-LoadTM Op Amp Drives All Capacitive Loads
Unity-Gain Stable
Maximum Input Offset Voltage: 600µV
Maximum Input Bias Current: 50nA
Maximum Input Offset Current: 15nA
Minimum DC Gain, RL = 2k: 30V/mV
Input Noise Voltage: 14nV/√Hz
Settling Time to 0.1%, 10V Step: 700ns
Settling Time to 0.01%, 10V Step: 1.25µs
Minimum Output Swing into 1k: ±13V
Minimum Output Swing into 500Ω: ±3.4V
Specified at ±2.5V, ±5V and ±15V
Available in SO-8 Package
LT1353 in Narrow Surface Mount Package
The LT1352/LT1353 are members of a family of fast, high
performance amplifiers using this unique topology and
employing Linear Technology Corporation’s advanced
complementary bipolar processing. For higher bandwidth
devices with higher supply current see the LT1354 through
LT1365 data sheets. Bandwidths of 12MHz, 25MHz, 50MHz
and 70MHz are available with 1mA, 2mA, 4mA and 6mA of
supply current per amplifier. Singles, duals and quads of
each amplifier are available. The LT1352 is available in an
8-lead SO package. The LT1353 is offered in a 14-lead
narrow surface mount package.
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APPLICATIO S
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Battery-Powered Systems
Wideband Amplifiers
Buffers
Active Filters
Data Acquisition Systems
Photodiode Amplifiers
, LTC and LT are registered trademarks of Linear Technology Corporation.
C-Load is a trademark of Linear Technology Corporation.
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TYPICAL APPLICATIO
Instrumentation Amplifier
R1
50k
R2
5k
–
1/2
LT1352
–
VIN
+
R5
1.1k
R3
5k
Large-Signal Response
R4
50k
–
1/2
LT1352
VOUT
+
+
GAIN = [R4/R3][1 + (1/2)(R2/R1 + R3/R4) + (R2 + R3)/R5] = 102
TRIM R5 FOR GAIN
TRIM R1 FOR COMMON MODE REJECTION
BW = 30kHz
1352/53 TA01
AV = –1
1352/53 TA02
13523fa
1
LT1352/LT1353
U
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 ................ – 40°C to 85°C
Specified Temperature Range (Note 7) .. – 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
W
U
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PACKAGE/ORDER INFORMATION
TOP VIEW
OUT A 1
–IN A 2
8
V+
7
OUT B
6
–IN B
5
+IN B
A
+IN A 3
B
V– 4
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 130°C/ W (N8)
TJMAX = 150°C, θJA = 190°C/ W (S8)
ORDER PART
NUMBER
LT1352CN8
LT1352CS8
LT1352IN8
LT1352IS8
S8 PART MARKING
ORDER PART
NUMBER
TOP VIEW
14 OUT D
OUT A 1
–IN A 2
A
D
+IN A 3
V+
LT1353CS
12 +IN D
11 V –
4
+IN B 5
13 –IN D
B
C
10 +IN C
–IN B 6
9 –IN C
OUT B 7
8 OUT C
S PACKAGE
14-LEAD PLASTIC SO
1352
1352I
TJMAX = 150°C, θJA = 150°C/ W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
TA = 25°C, VCM = 0V unless otherwise noted
SYMBOL
PARAMETER
TYP
MAX
UNITS
VOS
Input Offset Voltage
CONDITIONS
±15V
±5V
±2.5V
0.2
0.2
0.3
0.6
0.6
0.8
mV
mV
mV
IOS
Input Offset Current
±2.5V to ±15V
5
15
nA
IB
Input Bias Current
±2.5V to ±15V
20
50
nA
en
Input Noise Voltage
f = 10kHz
±2.5V to ±15V
14
nV/√Hz
in
Input Noise Current
f = 10kHz
±2.5V to ±15V
RIN
Input Resistance
VCM = ±12V
Differential
CIN
Input Capacitance
±15V
Positive Input Voltage Range
±15V
±5V
±2.5V
Negative Input Voltage Range
±15V
±5V
±2.5V
CMRR
Common Mode Rejection Ratio
VCM = ±12V
VCM = ±2.5V
VCM = ±0.5V
PSRR
Power Supply Rejection Ratio
VS = ±2.5V to ±15V
VSUPPLY
±15V
±15V
±15V
±5V
±2.5V
MIN
0.5
pA/√Hz
300
600
20
MΩ
MΩ
3
pF
12.0
2.5
0.5
13.5
3.5
1.0
V
V
V
– 13.5
– 3.5
– 1.0
80
78
68
94
86
77
90
106
– 12.0
– 2.5
– 0.5
V
V
V
dB
dB
dB
dB
13523fa
2
LT1352/LT1353
ELECTRICAL CHARACTERISTICS
TA = 25°C, VCM = 0V unless otherwise noted
SYMBOL
PARAMETER
CONDITIONS
VSUPPLY
MIN
TYP
AVOL
Large-Signal Voltage Gain
VOUT
IOUT
VOUT = ±12V, RL = 5k
VOUT = ±10V, RL = 2k
VOUT = ±10V, RL = 1k
VOUT = ±2.5V, RL = 5k
VOUT = ±2 .5V, RL = 2k
VOUT = ±2.5V, RL = 1k
VOUT = ±1V, RL = 5k
±15V
±15V
±15V
±5V
±5V
±5V
±2.5V
40
30
20
30
25
15
20
80
60
40
60
50
30
40
V/mV
V/mV
V/mV
V/mV
V/mV
V/mV
V/mV
Output Swing
RL = 5k, VIN = ±10mV
RL = 2k, VIN = ±10mV
RL = 1k, VIN = ±10mV
RL = 1k, VIN = ±10mV
RL= 500Ω, VIN = ±10mV
RL = 5k, VIN = ±10mV
±15V
±15V
±15V
±5V
±5V
±2.5V
13.5
13.4
13.0
3.5
3.4
1.3
14.0
13.8
13.4
4.0
3.8
1.7
±V
±V
±V
±V
±V
±V
Output Current
VOUT = ±13V
VOUT = ±3.4V
±15V
±5V
13.0
6.8
13.4
7.6
mA
mA
ISC
Short-Circuit Current
VOUT = 0V, VIN = ±3V
±15V
30
45
mA
SR
Slew Rate
AV = – 1, RL = 5k (Note 4)
±15V
±5V
120
30
200
50
V/µs
V/µs
Full-Power Bandwidth
10V Peak (Note 5)
3V Peak (Note 5)
±15V
±5V
3.2
2.6
MHz
MHz
GBW
Gain Bandwidth
f = 200kHz, RL = 10k
±15V
± 5V
± 2.5V
3.0
2.7
2.5
MHz
MHz
MHz
tr, tf
Rise Time, Fall Time
AV = 1, 10% to 90%, 0.1V
±15V
±5V
46
53
ns
ns
Overshoot
AV = 1, 0.1V
±15V
±5V
13
16
%
%
Propagation Delay
50% VIN to 50% VOUT, 0.1V
±15V
±5V
41
52
ns
ns
ts
Settling Time
10V Step, 0.1%, AV = – 1
10V Step, 0.01%, AV = – 1
5V Step, 0.1%, AV = – 1
5V Step, 0.01%, AV = – 1
±15V
±15V
±5V
±5V
700
1250
950
1400
ns
ns
ns
ns
RO
Output Resistance
AV = 1, f = 20kHz
±15V
1.5
Ω
Channel Separation
VOUT = ±10V, RL = 2k
±15V
120
dB
Supply Current
Each Amplifier
Each Amplifier
±15V
±5V
IS
2.0
1.8
101
MAX
UNITS
250
230
320
300
µA
µA
TYP
MAX
UNITS
0.8
0.8
1.0
mV
mV
mV
0°C ≤ TA ≤ 70°C, VCM = 0V unless otherwise noted
SYMBOL
PARAMETER
VOS
Input Offset Voltage
Input VOS Drift
CONDITIONS
VSUPPLY
MIN
±15V
±5V
±2.5V
(Note 6)
±2.5V to ±15V
3
8
µV/°C
IOS
Input Offset Current
±2.5V to ±15V
20
nA
IB
Input Bias Current
±2.5V to ±15V
75
nA
13523fa
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LT1352/LT1353
ELECTRICAL CHARACTERISTICS
0°C ≤ TA ≤ 70°C, VCM = 0V unless otherwise noted
SYMBOL
PARAMETER
CONDITIONS
VSUPPLY
MIN
CMRR
Common Mode Rejection Ratio
VCM = ±12V
VCM = ±2.5V
VCM = ±0.5V
±15V
±5V
±2.5V
78
77
67
dB
dB
dB
PSRR
Power Supply Rejection Ratio
VS = ±2.5V to ±15V
89
dB
AVOL
Large-Signal Voltage Gain
VOUT = ±12V, RL = 5k
VOUT = ±10V, RL = 2k
VOUT = ±2.5V, RL = 5k
VOUT = ±2 .5V, RL = 2k
VOUT = ±2.5V, RL = 1k
VOUT = ±1V, RL = 5k
±15V
±15V
±5V
±5V
±5V
±2.5V
25
20
20
15
10
15
V/mV
V/mV
V/mV
V/mV
V/mV
V/mV
VOUT
Output Swing
RL = 5k, VIN = ±10mV
RL = 2k, VIN = ±10mV
RL = 1k, VIN = ±10mV
RL = 1k, VIN = ±10mV
RL= 500Ω, VIN = ±10mV
RL = 5k, VIN = ±10mV
±15V
±15V
±15V
±5V
±5V
±2.5V
13.4
13.3
12.0
3.4
3.3
1.2
±V
±V
±V
±V
±V
±V
IOUT
Output Current
VOUT = ±12V
VOUT = ±3.3V
±15V
±5V
12.0
6.6
mA
mA
ISC
Short-Circuit Current
VOUT = 0V, VIN = ±3V
±15V
24
mA
SR
Slew Rate
AV = – 1, RL = 5k (Note 4)
±15V
±5V
100
21
V/µs
V/µs
GBW
Gain Bandwidth
f = 200kHz, RL = 10k
±15V
± 5V
1.8
1.6
MHz
MHz
Channel Separation
VOUT = ±10V, RL = 2k
±15V
100
dB
Supply Current
Each Amplifier
Each Amplifier
±15V
±5V
IS
TYP
MAX
UNITS
350
330
µA
µA
MAX
UNITS
1.0
1.0
1.2
mV
mV
mV
– 40°C ≤ TA ≤ 85°C, VCM = 0V unless otherwise noted (Note 7)
SYMBOL
PARAMETER
VOS
Input Offset Voltage
Input VOS Drift
CONDITIONS
VSUPPLY
MIN
TYP
±15V
±5V
±2.5V
(Note 6)
±2.5V to ±15V
3
8
µV/°C
IOS
Input Offset Current
±2.5V to ±15V
50
nA
IB
Input Bias Current
±2.5V to ±15V
100
nA
CMRR
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 = 5k
VOUT = ±10V, RL = 2k
VOUT = ±2.5V, RL = 5k
VOUT = ±2 .5V, RL = 2k
VOUT = ±2.5V, RL = 1k
VOUT = ±1V, RL = 5k
±15V
±5V
±2.5V
±15V
±15V
±5V
±5V
±5V
±2.5V
76
76
66
dB
dB
dB
87
dB
20
15
15
10
8
10
V/mV
V/mV
V/mV
V/mV
V/mV
V/mV
13523fa
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LT1352/LT1353
ELECTRICAL CHARACTERISTICS
– 40°C ≤ TA ≤ 85°C, VCM = 0V unless otherwise noted (Note 7)
SYMBOL
PARAMETER
CONDITIONS
VSUPPLY
MIN
VOUT
Output Swing
RL = 5k, VIN = ±10mV
RL = 2k, VIN = ±10mV
RL = 1k, VIN = ±10mV
RL = 1k, VIN = ±10mV
RL= 500Ω, VIN = ±10mV
RL = 5k, VIN = ±10mV
±15V
±15V
±15V
±5V
±5V
±2.5V
13.3
13.2
10.0
3.3
3.2
1.1
±V
±V
±V
±V
±V
±V
IOUT
Output Current
VOUT = ±10V
VOUT = ±3.2V
±15V
±5V
10.0
6.4
mA
mA
ISC
Short-Circuit Current
VOUT = 0V, VIN = ±3V
±15V
20
mA
SR
Slew Rate
AV = – 1, RL = 5k (Note 4)
±15V
±5V
50
15
V/µs
V/µs
GBW
Gain Bandwidth
f = 200kHz, RL = 10k
±15V
± 5V
1.6
1.4
MHz
MHz
Channel Separation
VOUT = ±10V, RL = 2k
±15V
99
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: Slew rate is measured between ±8V on the output with ±12V
TYP
MAX
UNITS
dB
µA
µA
380
350
input for ±15V supplies and ±2V on the output with ±3V input for ±5V
supplies.
Note 5: Full-power bandwidth is calculated from the slew rate
measurement: FPBW = (Slew Rate)/2πVP.
Note 6: This parameter is not 100% tested.
Note 7: The LT1352C/LT1353C are guaranteed to meet specified
performance from 0°C to 70°C. The LT1352C/LT1353C 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 LT1352I/LT1353I are guaranteed to meet specified performance
from␣ – 40°C to 85°C.
U W
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Supply Voltage
and Temperature
Input Common Mode Range
vs Supply Voltage
V+
350
30
TA = 25°C
∆VOS = 1mV
– 0.5
125°C
250
25°C
200
– 55°C
150
TA = 25°C
VS = ±15V
–1.0
INPUT BIAS CURRENT (nA)
300
COMMON MODE RANGE (V)
SUPPLY CURRENT PER AMPLIFIER (µA)
Input Bias Current
vs Input Common Mode Voltage
–1.5
–2.0
2.0
1.5
1.0
20
IB =
IB+ + IB–
2
10
0
–10
0.5
100
V–
0
10
5
15
SUPPLY VOLTAGE (± V)
20
1352/53 G01
0
15
10
5
SUPPLY VOLTAGE (± V)
20
1352/53 G02
–20
–15
10
–5
0
5
–10
INPUT COMMON MODE VOLTAGE (V)
15
1352/53 G03
13523fa
5
LT1352/LT1353
U W
TYPICAL PERFORMANCE CHARACTERISTICS
Input Bias Current vs Temperature
100
VS = ±15V
IB+ + IB–
IB =
2
28
24
20
16
12
8
110
10
TA = 25°C
TA = 25°C
VS = ±15V
AV = 101
RS = 100k
en
1
10
in
VS = ±15V
100
OPEN-LOOP GAIN (dB)
32
Open-Loop Gain vs Resistive Load
INPUT CURRENT NOISE (pA/√Hz)
INPUT BIAS CURRENT (nA)
36
Input Noise Spectral Density
INPUT VOLTAGE NOISE (nV/√Hz)
40
VS = ±5V
90
80
70
4
50
25
0
75
TEMPERATURE (°C)
100
125
1
10
1k
100
FREQUENCY (Hz)
1352/53 G04
97
96
95
V+
50
25
75
0
TEMPERATURE (°C)
100
RL = 1k
–2
–3
TA = 25°C
VIN = ±10mV
3
RL = 1k
2
RL = 2k
0
5
10
VS = ±15V
10
8
2
0
–2
–4
10mV
–8
1mV
VS = ±15V
AV = 1
OUTPUT
FILTER:
1.6MHz
LPF
–10
100
125
1352/53 G10
– 40°C
– 40°C
25°C
85°C
15
0.7 0.8 0.9
1 1.1 1.2 1.3 1.4 1.5 1.6
SETTLING TIME (µs)
1352/53 G11
20
6
1mV
4
–6
30
25°C
85°C
1.0
8
OUTPUT STEP (V)
OUTPUT STEP (V)
SOURCE
50
25
75
0
TEMPERATURE (°C)
1.5
10
10mV
35
25
–50 –25
2.0
– 40°C 85°C
Settling Time vs Output Step
(Inverting)
6
40
–2.0
25°C
1352/53 G09
55
45
– 40°C
–1.5
Settling Time vs Output Step
(Noninverting)
SINK
85°C
1352/53 G08
Output Short-Circuit Current
vs Temperature
50
25°C
–1.0
V–
–20 –15 –10 – 5 0
10
5
OUTPUT CURRENT (mA)
20
15
SUPPLY VOLTAGE (V)
VS = ±5V
VIN = 10mV
0.5
V–
125
1352/53 G07
OUTPUT SHORT-CIRCUIT CURRENT (mA)
– 0.5
RL = 2k
1
94
–50 –25
60
Output Voltage Swing
vs Load Current
–1
98
10k
1352/53 G06
V+
OUTPUT VOLTAGE SWING (V)
OPEN-LOOP GAIN (dB)
99
1k
LOAD RESISTANCE (Ω)
Output Voltage Swing
vs Supply Voltage
VS = ±15V
VO = ±12V
RL = 5k
100
10
1352/53 G05
Open-Loop Gain vs Temperature
100
60
0.1
10k
1
OUTPUT VOLTAGE SWING (V)
0
–50 –25
4
2
10mV
1mV
0
–2
–4
–6
–8
10mV
VS = ±15V
AV = –1
RG = RF = 2k
CF = 5pF
RL = 2k
1mV
–10
0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5
SETTLING TIME (µs)
1352/53 G12
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LT1352/LT1353
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TYPICAL PERFORMANCE CHARACTERISTICS
60
VS = ±5V
40
30
GAIN
20
20
10
0
0
–20
–10
–40
100M
1k
10k
100k
1M
FREQUENCY (Hz)
10M
6
AV = 100
AV = 10
10
1
10k
1k
100k
1M
FREQUENCY (Hz)
4.00
VS = ±5V
46
3
3.75
PHASE MARGIN
44
10M
42
3.25
40
38
VS = ±15V
36
VS = ±5V
34
50
25
0
75
TEMPERATURE (°C)
100
5
4
3
2
2
1
1
0
–1
±15V
±5V
±2.5V
–3
–5
10k
100k
1M
FREQUENCY (Hz)
3.75
44
3.50
42
3.25
40
3.00
38
36
2.75
GAIN BANDWIDTH
2.50
34
32
2.25
30
2.00
0
15
10
5
SUPPLY VOLTAGE (± V)
20
1352/53 G19
POWER SUPPLY REJECTION RATIO (dB)
46
PHASE MARGIN (DEG)
GAIN BANDWIDTH (MHz)
120
48
PHASE MARGIN
–2
±15V
±5V
±2.5V
–5
10k
10M
100k
1M
FREQUENCY (Hz)
10M
1352/53 G18
Power Supply Rejection Ratio
vs Frequency
50
4.00
–1
1352/53 G17
Gain Bandwidth and Phase Margin
vs Supply Voltage
TA = 25°C
0
–4
1352/53 G16
4.25
TA = 25°C
AV = –1
RF = RG = 5k
–3
–4
30
125
4.50
10M
Frequency Response
vs Supply Voltage (AV = – 1)
TA = 25°C
AV = 1
RL = 5k
–2
32
2.00
–50 –25
100k
1M
FREQUENCY (Hz)
1352/53 G15
GAIN (dB)
GAIN BANDWIDTH (MHz)
3.50
GAIN (dB)
4
PHASE MARGIN (DEG)
5
48
2.25
–10
10k
Frequency Response
vs Supply Voltage (AV = 1)
50
2.50
C = 10pF
–2
1352/53 G14
VS = ±15V
2.75
0
–8
0.01
4.25
3.00
C = 1000pF
2
–4
Gain Bandwidth and Phase Margin
vs Temperature
GAIN BANDWIDTH
C = 5000pF
C = 500pF
C = 100pF
–6
0.1
1352/53 G13
4.50
TA = 25°C
VS = ±15V
AV = –1
RFB = RG = 5k
4
AV = 1
GAIN (dB)
VS = ±5V
8
100
80
VS = ±15V
PHASE (DEG)
40
100
Common Mode Rejection Ratio
vs Frequency
TA = 25°C
VS = ±15V
100
80
– PSRR = +PSRR
60
40
20
0
10
100
1k
10k 100k
FREQUENCY (Hz)
1M
10M
1352/53 G20
120
COMMON MODE REJECTION RATIO (dB)
VS = ±15V
TA = 25°C
VS = ±15V
OUTPUT IMPEDANCE (Ω)
PHASE
50
GAIN (dB)
TA = 25°C
AV = –1
RF = RG = 5k
10
1000
120
70
60
Frequency Response
vs Capacitive Load
Output Impedance vs Frequency
Gain and Phase vs Frequency
100
TA = 25°C
VS = ±15V
80
60
40
20
0
100
1k
10k
100k
FREQUENCY (Hz)
1M
10M
1352/53 G21
13523fa
7
LT1352/LT1353
U W
TYPICAL PERFORMANCE CHARACTERISTICS
Slew Rate vs Supply Voltage
TA = 25°C
AV = –1
RF = RG = 5k
SR = (SR+ + SR – )/2
Slew Rate vs Input Level
150
VS = ±15V
150
100
VS = ±5V
50
50
TA = 25°C
VS = ±15V
AV = –1
RFB = RG = 5k
SR = (SR+ + SR –)/2
175
SLEW RATE (V/µs)
100
200
AV = –1
RF = RG = RL = 5k
SR = (SR+ + SR – )/2
200
SLEW RATE (V/µs)
150
SLEW RATE (V/µs)
Slew Rate vs Temperature
250
200
125
100
75
50
25
0
0
0
–50 –25
15
5
10
SUPPLY VOLTAGE (±V)
50
0
75
25
TEMPERATURE (°C)
1352/53 G22
AV = 1
20
15
10
5
AV = 1
0.001
10
100
1k
10k
FREQUENCY (Hz)
100k
FREQUENCY (Hz)
4
3
– 50
CROSSTALK (dB)
– 60
–70
TA = 25°C
AV = 1
RL = 1k
VIN = 15dBm
90
80
–70
– 80
– 90
–110
FREQUENCY (Hz)
1352/53 G28
–120
100
TA = 25°C
VS = ±15V
RL = 5k
70
AV = 1
60
50
40
AV = –1
30
20
– 80
1M
1M
Capacitive Load Handling
–100
2ND HARMONIC
100k
FREQUENCY (Hz)
100
OVERSHOOT (%)
VS = ±15V
AV = 1
RL = 5k
VO = 2VP-P
– 60
VS = ± 5V
RL = 5k
THD = 1%
1352/53 G27
Crosstalk vs Frequency
3RD HARMONIC
AV = –1
5
0
10k
1M
– 40
– 50
AV = 1
6
1352/53 G26
2nd and 3rd Harmonic Distortion
vs Frequency
HARMONIC DISTORTION (dB)
7
1
1352/53 G25
– 90
100k
8
2
VS = ±15V
RL = 5k
THD = 1%
0
10k
100k
OUTPUT VOLTAGE (VP-P)
OUTPUT VOLTAGE (VP-P)
TOTAL HARMONIC DISTORTION (%)
AV = –1
24
9
25
0.01
20
10
AV = –1
0.1
8
16
12
INPUT LEVEL (VP-P)
Undistorted Output Swing
vs Frequency (±5V)
30
TA = 25°C
VS = ±15V
RL = 5k
VO = 2VP-P
4
0
1352/53 G24
Undistorted Output Swing
vs Frequency (±15V)
1
– 40
0
125
1352/53 G23
Total Harmonic Distortion
vs Frequency
– 30
100
10
1k
10k
100k
FREQUENCY (Hz)
1M
10M
1352/53 G29
0
10p
100p
1n
10n
0.1µ
CAPACITIVE LOAD (F)
1µ
1352/53 G30
13523fa
8
LT1352/LT1353
U W
TYPICAL PERFORMANCE CHARACTERISTICS
Small-Signal Transient
(AV = 1)
Small-Signal Transient
(AV = – 1)
1352/53 G31
Small-Signal Transient
(AV = – 1, CL = 1000pF)
1352/53 G32
Large-Signal Transient
(AV = 1)
Large-Signal Transient
(AV = – 1)
1352/53 G34
1352/53 G33
Large-Signal Transient
(AV = 1, CL = 10,000pF)
1352/53 G35
1352/53 G36
U
W
U
U
APPLICATIONS INFORMATION
Layout and Passive Components
Capacitive Loading
The LT1352/LT1353 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 LT1352/LT1353 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. Graphs
of Frequency Response vs Capacitive Load, Capacitive
Load Handling and the transient response photos clearly
show these effects.
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 even oscillations. If feedback resistors greater
than 10k are used, a parallel capacitor of value, C F >
(RG)(CIN/RF), should be used to cancel the input pole and
optimize dynamic performance. For applications where
the DC noise gain is one and a large feedback resistor is
used, CF should be greater than or equal to CIN. An
example would be an I-to-V converter as shown in the
Typical Applications section.
Input Considerations
Each of the LT1352/LT1353 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
13523fa
9
LT1352/LT1353
U
W
U
U
APPLICATIONS INFORMATION
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 time that the
inputs are apart. Measure the average supply current for
the application in order to calculate the power dissipation.
Circuit Operation
The LT1352/LT1353 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 R1, a 1k resistor. The input
voltage appears across the resistor generating currents
which are mirrored into the high impedance node and
compensation capacitor CT. Complementary followers
form an output stage which buffers the gain node from the
load. The output devices Q19 and Q22 are connected to
form a composite PNP and a composite NPN.
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 high
impedance 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 graph Slew Rate vs Input Level illustrates
this relationship. In higher gain configurations the largesignal performance and the small-signal performance
both look like a single pole response.
Capacitive load compensation is provided by the RC, CC
network which is bootstrapped across the output stage.
When the amplifier is driving a light load the network has
no effect. 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
and a zero is created by the RC combination, both of which
improve the phase margin. The design ensures 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 LT1352/LT1353 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 of 150°C under certain conditions.
Maximum junction temperature TJ is calculated from the
ambient temperature TA and power dissipation PD as
follows:
LT1352CN8: TJ = TA + (PD)(130°C/W)
LT1352CS8: TJ = TA + (PD)(190°C/W)
LT1353CS: TJ = TA + (PD)(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 PD(MAX) is:
PD(MAX) = (V + – V –)(IS(MAX)) + (V +/2)2/RL or
(V + – V –)(IS(MAX)) + (V + – VMAX)(IMAX)
Example: LT1353 in S14 at 85°C, VS = ±15V, RL = 500Ω,
VOUT = ±5V (±10mA)
PD(MAX) = (30V)(380µA) + (15V – 5V)(10mA) = 111mW
TJ = 85°C + (4)(111mW)(150°C/W) = 152°C
13523fa
10
LT1352/LT1353
W
W
SI PLIFIED SCHE ATIC
V+
R2
Q11
Q10
Q12
C1
R3
Q21
Q20
R6
Q9
–IN
Q5
Q7 R1 Q3
1k
Q17
Q2
Q6
Q8
Q19
Q1
RC
CC
+IN
OUTPUT
Q18
Q4
R7
Q22
Q13
C2
CT
Q14
Q15
Q16
Q23
Q24
R4
V–
R5
1352/53 SS
13523fa
11
LT1352/LT1353
U
TYPICAL APPLICATIONS
DAC I-to-V Converter
10pF
DAC
INPUTS
12
5k
–
1/2
LT1352
565A TYPE
VOUT
+
5k
V
VOS + IOS (5kΩ) + OUT < 0.5LSB
AVOL
1352/53 TA03
400kHz Photodiode Preamp with 10kHz Highpass Loop
1N5712
10k
–
BPV22NF
1/2
LT1352
1.5k
VOUT
+
10k
+
1/2
LT1352
–
10nF
10nF
10k
1352/53 TA05
13523fa
12
LT1352/LT1353
U
PACKAGE DESCRIPTION
N8 Package
8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
.400*
(10.160)
MAX
8
7
6
5
1
2
3
4
.255 ± .015*
(6.477 ± 0.381)
.300 – .325
(7.620 – 8.255)
.008 – .015
(0.203 – 0.381)
(
+.035
.325 –.015
8.255
+0.889
–0.381
)
.045 – .065
(1.143 – 1.651)
.130 ± .005
(3.302 ± 0.127)
.065
(1.651)
TYP
.100
(2.54)
BSC
.120
(3.048) .020
MIN (0.508)
MIN
.018 ± .003
(0.457 ± 0.076)
N8 1002
NOTE:
1. DIMENSIONS ARE
INCHES
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
13523fa
13
LT1352/LT1353
U
PACKAGE DESCRIPTION
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.189 – .197
(4.801 – 5.004)
NOTE 3
.045 ±.005
.050 BSC
8
.245
MIN
7
6
5
.160 ±.005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
.030 ±.005
TYP
1
RECOMMENDED SOLDER PAD LAYOUT
.010 – .020
× 45°
(0.254 – 0.508)
.008 – .010
(0.203 – 0.254)
0°– 8° TYP
.016 – .050
(0.406 – 1.270)
NOTE:
1. DIMENSIONS IN
.053 – .069
(1.346 – 1.752)
.014 – .019
(0.355 – 0.483)
TYP
INCHES
(MILLIMETERS)
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)
2
3
4
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
SO8 0303
13523fa
14
LT1352/LT1353
U
PACKAGE DESCRIPTION
S Package
14-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.337 – .344
(8.560 – 8.738)
NOTE 3
.045 ±.005
.050 BSC
14
N
12
11
10
9
8
N
.245
MIN
.160 ±.005
.150 – .157
(3.810 – 3.988)
NOTE 3
.228 – .244
(5.791 – 6.197)
1
.030 ±.005
TYP
13
2
3
N/2
N/2
RECOMMENDED SOLDER PAD LAYOUT
1
.010 – .020
× 45°
(0.254 – 0.508)
.008 – .010
(0.203 – 0.254)
2
3
4
5
6
.053 – .069
(1.346 – 1.752)
.004 – .010
(0.101 – 0.254)
0° – 8° TYP
.016 – .050
(0.406 – 1.270)
NOTE:
1. DIMENSIONS IN
.014 – .019
(0.355 – 0.483)
TYP
7
.050
(1.270)
BSC
INCHES
(MILLIMETERS)
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)
S14 0502
13523fa
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.
15
LT1352/LT1353
U
TYPICAL APPLICATIONS
20kHz, 4th Order Butterworth Filter
4.64k
5.49k
470pF
220pF
4.64k
13.3k
–
VIN
2200pF
1/2
LT1352
+
5.49k
11.3k
4700pF
–
1/2
LT1352
VOUT
+
1352/53 TA04
RELATED PARTS
PART NUMBER
LT1351
LT1354/55/56
DESCRIPTION
250µA, 3MHz, 200V/µs Op Amp
Single/Dual/Quad 1mA, 12MHz, 400V/µs Op Amp
COMMENTS
Good DC Precision, C-Load Stable, Power Saving Shutdown
Good DC Precision, Stable with All Capacitive Loads
13523fa
16
Linear Technology Corporation
LT/TP 0603 1K REV A • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507
●
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LINEAR TECHNOLOGY CORPORATION 1996
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