1
LT1352/LT1353
13523fa
TYPICAL APPLICATIO
U
APPLICATIO S
U
DESCRIPTIO
U
FEATURES
Dual and Quad
250µA, 3MHz, 200V/µs
Operational Amplifiers
■
3MHz Gain Bandwidth
■
200V/µs Slew Rate
■
250µA Supply Current per Amplifier
■
C-Load
TM
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, R
L
= 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
■
Battery-Powered Systems
■
Wideband Amplifiers
■
Buffers
■
Active Filters
■
Data Acquisition Systems
■
Photodiode Amplifiers
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.
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.
C-Load is a trademark of Linear Technology Corporation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Instrumentation Amplifier Large-Signal Response
A
V
= –1 1352/53 TA02
+
–
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
–
+
1/2
LT1352
–
+
1/2
LT1352
R1
50k R2
5k R5
1.1k
R3
5k
R4
50k
V
IN
V
OUT
1352/53 TA01
■
Available in SO-8 Package
■
LT1353 in Narrow Surface Mount Package
2
LT1352/LT1353
13523fa
Consult LTC Marketing for parts specified with wider operating temperature ranges.
SYMBOL PARAMETER CONDITIONS V
SUPPLY
MIN TYP MAX UNITS
V
OS
Input Offset Voltage ±15V 0.2 0.6 mV
±5V 0.2 0.6 mV
±2.5V 0.3 0.8 mV
I
OS
Input Offset Current ±2.5V to ±15V 5 15 nA
I
B
Input Bias Current ±2.5V to ±15V 20 50 nA
e
n
Input Noise Voltage f = 10kHz ±2.5V to ±15V 14 nV/√Hz
i
n
Input Noise Current f = 10kHz ±2.5V to ±15V 0.5 pA/√Hz
R
IN
Input Resistance V
CM
= ±12V ±15V 300 600 MΩ
Differential ±15V 20 MΩ
C
IN
Input Capacitance ±15V 3 pF
Positive Input Voltage Range ±15V 12.0 13.5 V
±5V 2.5 3.5 V
±2.5V 0.5 1.0 V
Negative Input Voltage Range ±15V –13.5 –12.0 V
±5V –3.5 –2.5 V
±2.5V –1.0 –0.5 V
CMRR Common Mode Rejection Ratio V
CM
= ±12V ±15V 80 94 dB
V
CM
= ±2.5V ±5V 78 86 dB
V
CM
= ±0.5V ±2.5V 68 77 dB
PSRR Power Supply Rejection Ratio V
S
= ±2.5V to ±15V 90 106 dB
ABSOLUTE MAXIMUM RATINGS
W
WW
U
Total Supply Voltage (V
+
to V
–
) .............................. 36V
Differential Input Voltage (Transient Only, Note 2) ±10V
Input Voltage .......................................................... ±V
S
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
ELECTRICAL CHARACTERISTICS
TA = 25°C, VCM = 0V unless otherwise noted
PACKAGE/ORDER INFORMATION
W
UU
ORDER PART
NUMBER ORDER PART
NUMBER
LT1352CN8
LT1352CS8
LT1352IN8
LT1352IS8
LT1353CS
TOP VIEW
S PACKAGE
14-LEAD PLASTIC SO
1
2
3
4
5
6
7
14
13
12
11
10
9
8
OUT A
–IN A
+IN A
V
+
+IN B
–IN B
OUT B
OUT D
–IN D
+IN D
V
–
+IN C
–IN C
OUT C
C
B
D
A
T
JMAX
= 150°C, θ
JA
= 150°C/ W
S8 PART MARKING
1352
1352I
1
2
3
4
8
7
6
5
TOP VIEW
OUT A
–IN A
+IN A
V
–
V
+
OUT B
–IN B
+IN B
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
B
A
T
JMAX
= 150°C, θ
JA
= 130°C/W (N8)
T
JMAX
= 150°C, θ
JA
= 190°C/ W (S8)
(Note 1)
3
LT1352/LT1353
13523fa
SYMBOL PARAMETER CONDITIONS V
SUPPLY
MIN TYP MAX UNITS
A
VOL
Large-Signal Voltage Gain V
OUT
= ±12V, R
L
= 5k ±15V 40 80 V/mV
V
OUT
= ±10V, R
L
= 2k ±15V 30 60 V/mV
V
OUT
= ±10V, R
L
= 1k ±15V 20 40 V/mV
V
OUT
= ±2.5V, R
L
= 5k ±5V 30 60 V/mV
V
OUT
= ±2.5V, R
L
= 2k ±5V 25 50 V/mV
V
OUT
= ±2.5V, R
L
= 1k ±5V 15 30 V/mV
V
OUT
= ±1V, R
L
= 5k ±2.5V 20 40 V/mV
V
OUT
Output Swing R
L
= 5k, V
IN
= ±10mV ±15V 13.5 14.0 ±V
R
L
= 2k, V
IN
= ±10mV ±15V 13.4 13.8 ±V
R
L
= 1k, V
IN
= ±10mV ±15V 13.0 13.4 ±V
R
L
= 1k, V
IN
= ±10mV ±5V 3.5 4.0 ±V
R
L
= 500Ω, V
IN
= ±10mV ±5V 3.4 3.8 ±V
R
L
= 5k, V
IN
= ±10mV ±2.5V 1.3 1.7 ±V
I
OUT
Output Current V
OUT
= ±13V ±15V 13.0 13.4 mA
V
OUT
= ±3.4V ±5V 6.8 7.6 mA
I
SC
Short-Circuit Current V
OUT
= 0V, V
IN
= ±3V ±15V 30 45 mA
SR Slew Rate A
V
= –1, R
L
= 5k (Note 4) ±15V 120 200 V/µs
±5V 30 50 V/µs
Full-Power Bandwidth 10V Peak (Note 5) ±15V 3.2 MHz
3V Peak (Note 5) ±5V 2.6 MHz
GBW Gain Bandwidth f = 200kHz, R
L
= 10k ±15V 2.0 3.0 MHz
±5V 1.8 2.7 MHz
±2.5V 2.5 MHz
t
r
, t
f
Rise Time, Fall Time A
V
= 1, 10% to 90%, 0.1V ±15V 46 ns
±5V 53 ns
Overshoot A
V
= 1, 0.1V ±15V 13 %
±5V 16 %
Propagation Delay 50% V
IN
to 50% V
OUT
, 0.1V ±15V 41 ns
±5V 52 ns
t
s
Settling Time 10V Step, 0.1%, A
V
= –1 ±15V 700 ns
10V Step, 0.01%, A
V
= –1 ±15V 1250 ns
5V Step, 0.1%, A
V
= –1 ±5V 950 ns
5V Step, 0.01%, A
V
= –1 ±5V 1400 ns
R
O
Output Resistance A
V
= 1, f = 20kHz ±15V 1.5 Ω
Channel Separation V
OUT
= ±10V, R
L
= 2k ±15V 101 120 dB
I
S
Supply Current Each Amplifier ±15V 250 320 µA
Each Amplifier ±5V 230 300 µA
ELECTRICAL CHARACTERISTICS
TA = 25°C, VCM = 0V unless otherwise noted
SYMBOL PARAMETER CONDITIONS V
SUPPLY
MIN TYP MAX UNITS
V
OS
Input Offset Voltage ±15V 0.8 mV
±5V 0.8 mV
±2.5V 1.0 mV
Input V
OS
Drift (Note 6) ±2.5V to ±15V 3 8 µV/°C
I
OS
Input Offset Current ±2.5V to ±15V 20 nA
I
B
Input Bias Current ±2.5V to ±15V 75 nA
0°C ≤ TA ≤ 70°C, VCM = 0V unless otherwise noted
4
LT1352/LT1353
13523fa
0°C ≤ TA ≤ 70°C, VCM = 0V unless otherwise noted
SYMBOL PARAMETER CONDITIONS V
SUPPLY
MIN TYP MAX UNITS
CMRR Common Mode Rejection Ratio V
CM
= ±12V ±15V 78 dB
V
CM
= ±2.5V ±5V 77 dB
V
CM
= ±0.5V ±2.5V 67 dB
PSRR Power Supply Rejection Ratio V
S
= ±2.5V to ±15V 89 dB
A
VOL
Large-Signal Voltage Gain V
OUT
= ±12V, R
L
= 5k ±15V 25 V/mV
V
OUT
= ±10V, R
L
= 2k ±15V 20 V/mV
V
OUT
= ±2.5V, R
L
= 5k ±5V 20 V/mV
V
OUT
= ±2.5V, R
L
= 2k ±5V 15 V/mV
V
OUT
= ±2.5V, R
L
= 1k ±5V 10 V/mV
V
OUT
= ±1V, R
L
= 5k ±2.5V 15 V/mV
V
OUT
Output Swing R
L
= 5k, V
IN
= ±10mV ±15V 13.4 ±V
R
L
= 2k, V
IN
= ±10mV ±15V 13.3 ±V
R
L
= 1k, V
IN
= ±10mV ±15V 12.0 ±V
R
L
= 1k, V
IN
= ±10mV ±5V 3.4 ±V
R
L
= 500Ω, V
IN
= ±10mV ±5V 3.3 ±V
R
L
= 5k, V
IN
= ±10mV ±2.5V 1.2 ±V
I
OUT
Output Current V
OUT
= ±12V ±15V 12.0 mA
V
OUT
= ±3.3V ±5V 6.6 mA
I
SC
Short-Circuit Current V
OUT
= 0V, V
IN
= ±3V ±15V 24 mA
SR Slew Rate A
V
= –1, R
L
= 5k (Note 4) ±15V 100 V/µs
±5V 21 V/µs
GBW Gain Bandwidth f = 200kHz, R
L
= 10k ±15V 1.8 MHz
±5V 1.6 MHz
Channel Separation V
OUT
= ±10V, R
L
= 2k ±15V 100 dB
I
S
Supply Current Each Amplifier ±15V 350 µA
Each Amplifier ±5V 330 µA
ELECTRICAL CHARACTERISTICS
–40°C ≤ TA ≤ 85°C, VCM = 0V unless otherwise noted (Note 7)
SYMBOL PARAMETER CONDITIONS V
SUPPLY
MIN TYP MAX UNITS
V
OS
Input Offset Voltage ±15V 1.0 mV
±5V 1.0 mV
±2.5V 1.2 mV
Input V
OS
Drift (Note 6) ±2.5V to ±15V 3 8 µV/°C
I
OS
Input Offset Current ±2.5V to ±15V 50 nA
I
B
Input Bias Current ±2.5V to ±15V 100 nA
CMRR Common Mode Rejection Ratio V
CM
= ±12V ±15V 76 dB
V
CM
= ±2.5V ±5V 76 dB
V
CM
= ±0.5V ±2.5V 66 dB
PSRR Power Supply Rejection Ratio V
S
= ±2.5V to ±15V 87 dB
A
VOL
Large-Signal Voltage Gain V
OUT
= ±12V, R
L
= 5k ±15V 20 V/mV
V
OUT
= ±10V, R
L
= 2k ±15V 15 V/mV
V
OUT
= ±2.5V, R
L
= 5k ±5V 15 V/mV
V
OUT
= ±2.5V, R
L
= 2k ±5V 10 V/mV
V
OUT
= ±2.5V, R
L
= 1k ±5V 8 V/mV
V
OUT
= ±1V, R
L
= 5k ±2.5V 10 V/mV
5
LT1352/LT1353
13523fa
ELECTRICAL CHARACTERISTICS
–40°C ≤ TA ≤ 85°C, VCM = 0V unless otherwise noted (Note 7)
SYMBOL PARAMETER CONDITIONS V
SUPPLY
MIN TYP MAX UNITS
V
OUT
Output Swing R
L
= 5k, V
IN
= ±10mV ±15V 13.3 ±V
R
L
= 2k, V
IN
= ±10mV ±15V 13.2 ±V
R
L
= 1k, V
IN
= ±10mV ±15V 10.0 ±V
R
L
= 1k, V
IN
= ±10mV ±5V 3.3 ±V
R
L
= 500Ω, V
IN
= ±10mV ±5V 3.2 ±V
R
L
= 5k, V
IN
= ±10mV ±2.5V 1.1 ±V
I
OUT
Output Current V
OUT
= ±10V ±15V 10.0 mA
V
OUT
= ±3.2V ±5V 6.4 mA
I
SC
Short-Circuit Current V
OUT
= 0V, V
IN
= ±3V ±15V 20 mA
SR Slew Rate A
V
= –1, R
L
= 5k (Note 4) ±15V 50 V/µs
±5V 15 V/µs
GBW Gain Bandwidth f = 200kHz, R
L
= 10k ±15V 1.6 MHz
±5V 1.4 MHz
Channel Separation V
OUT
= ±10V, R
L
= 2k ±15V 99 dB
I
S
Supply Current Each Amplifier ±15V 380 µA
Each Amplifier ±5V 350 µA
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
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)/2πV
P
.
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.
TYPICAL PERFORMANCE CHARACTERISTICS
UW
SUPPLY VOLTAGE (±V)
0
SUPPLY CURRENT PER AMPLIFIER (µA)
200
250
125°C
25°C
–55°C
20
1352/53 G01
150
100 510 15
350
300
Supply Current vs Supply Voltage
and Temperature
SUPPLY VOLTAGE (±V)
0
V
–
COMMON MODE RANGE (V)
0.5
1.5
2.0
V
+
–1.5
10 20
1352/53 G02
1.0
–1.0
–0.5
–2.0
515
T
A
= 25°C
∆V
OS
= 1mV
Input Common Mode Range
vs Supply Voltage
INPUT COMMON MODE VOLTAGE (V)
–15
–20
INPUT BIAS CURRENT (nA)
–10
0
10
20
30
–10 –5 0 5
1352/53 G03
10 15
TA = 25°C
VS = ±15V
IB = IB+ + IB–
2
Input Bias Current
vs Input Common Mode Voltage
6
LT1352/LT1353
13523fa
TYPICAL PERFORMANCE CHARACTERISTICS
UW
Input Bias Current vs Temperature Open-Loop Gain vs Resistive LoadInput Noise Spectral Density
TEMPERATURE (°C)
–50
0
INPUT BIAS CURRENT (nA)
4
12
16
20
40
28
050 75
1352/53 G04
8
32
36
24
–25 25 100 125
V
S
= ±15V
I
B
= I
B+
+ I
B–
2
LOAD RESISTANCE (Ω)
10
60
OPEN-LOOP GAIN (dB)
90
100
110
100 1k 10k
1352/53 G06
80
70
T
A
= 25°C
V
S
= ±5V
V
S
= ±15V
FREQUENCY (Hz)
1
10
e
n
100
0.1
1
10
10 100
1352/53 G05
INPUT VOLTAGE NOISE (nV/√Hz)
INPUT CURRENT NOISE (pA/√Hz)
11k 10k
i
n
T
A
= 25°C
V
S
= ±15V
A
V
= 101
R
S
= 100k
Output Voltage Swing
vs Load Current
Output Voltage Swing
vs Supply Voltage
Open-Loop Gain vs Temperature
TEMPERATURE (°C)
–50
OPEN-LOOP GAIN (dB)
98
99
100
25 75
1352/53 G07
97
96
–25 0 50 100 125
95
94
V
S
= ±15V
V
O
= ±12V
R
L
= 5k
OUTPUT CURRENT (mA)
–20
V–
OUTPUT VOLTAGE SWING (V)
0.5
1.5
2.0
V+
25°C
25°C
–1.5
–10 05
1352/53 G09
1.0
–1.0
–0.5
–2.0
–15 –5 10 15 20
VS = ±5V
VIN = 10mV 85°C
85°C
–40°C
–40°C
–40°C–40°C
85°C
85°C
25°C
25°C
SUPPLY VOLTAGE (V)
0
–3
–2
V+
15
1352/53 G08
3
2
510 20
1
V
–
–1
OUTPUT VOLTAGE SWING (V)
TA = 25°C
VIN = ±10mV
RL = 2k
RL = 2k
RL = 1k
RL = 1k
Settling Time vs Output Step
(Inverting)
Settling Time vs Output Step
(Noninverting)
Output Short-Circuit Current
vs Temperature
TEMPERATURE (°C)
–50
45
50
60
SINK
25 75
1352/53 G10
40
35
–25 0 50 100 125
30
25
55
OUTPUT SHORT-CIRCUIT CURRENT (mA)
SOURCE
VS = ±15V
SETTLING TIME (µs)
0.7
–10
OUTPUT STEP (V)
–8
–4
–2
0
10
4
0.9 1.1 1.2 1.6
1352/53 G11
–6
6
8
2
0.8 1 1.3 1.4 1.5
V
S
= ±15V
A
V
= 1
OUTPUT
FILTER:
1.6MHz
LPF
10mV
10mV 1mV
1mV
SETTLING TIME (µs)
0.5
OUTPUT STEP (V)
2
6
10
1.3
1352/53 G12
–2
–6
0
4
8
–4
–8
–10 0.7 0.9 1.1
0.6 1.4
0.8 1.0 1.2 1.5
V
S
= ±15V
A
V
= –1
R
G
= R
F
= 2k
C
F
= 5pF
R
L
= 2k
10mV 1mV
1mV10mV
7
LT1352/LT1353
13523fa
TYPICAL PERFORMANCE CHARACTERISTICS
UW
TEMPERATURE (°C)
–50
2.00
GAIN BANDWIDTH (MHz)
PHASE MARGIN (DEG)
2.25
2.75
3.00
3.25
4.50
3.75
050 75
1352/53 G16
2.50
4.00
4.25
3.50
30
32
36
38
40
50
44
34
46
48
42
–25 25 100 125
V
S
= ±15V
V
S
= ±5V
V
S
= ±15V
V
S
= ±5V
PHASE MARGIN
GAIN BANDWIDTH
Gain Bandwidth and Phase Margin
vs Temperature
Frequency Response
vs Supply Voltage (AV = –1)
FREQUENCY (Hz)
10k
–1
GAIN (dB)
0
1
2
3
100k 1M 10M
1352/53 G18
–2
–3
–4
–5
4
5T
A
= 25°C
A
V
= –1
R
F
= R
G
= 5k
±15V
±5V
±2.5V
Frequency Response
vs Capacitive Load
FREQUENCY (Hz)
10k
–2
GAIN (dB)
0
2
4
6
100k 1M 10M
1352/53 G15
–4
–6
–8
–10
8
10 T
A
= 25°C
V
S
= ±15V
A
V
= –1
R
FB
= R
G
= 5k C = 500pF
C = 100pF
C = 5000pF
C = 1000pF
C = 10pF
Output Impedance vs Frequency
FREQUENCY (Hz)
0.1
OUTPUT IMPEDANCE (Ω)
1
10
100
1000
1k 100k 1M 10M
1352/53 G14
0.01 10k
TA = 25°C
VS = ±15V
AV = 100AV = 10 AV = 1
Gain and Phase vs Frequency
FREQUENCY (Hz)
10
GAIN (dB)
PHASE (DEG)
20
40
60
70
1k 100k 1M 100M
1352/53 G13
0
10k 10M
50
30
–10
0
20
60
100
120
–20
80
40
–40
PHASE
GAIN
V
S
= ±15V
T
A
= 25°C
A
V
= –1
R
F
= R
G
= 5k
V
S
= ±15V
V
S
= ±5VV
S
= ±5V
FREQUENCY (Hz)
10k
–1
GAIN (dB)
0
1
2
3
100k 1M 10M
1352/53 G17
–2
–3
–4
–5
4
5T
A
= 25°C
A
V
= 1
R
L
= 5k
±15V
±5V
±2.5V
Frequency Response
vs Supply Voltage (AV = 1)
FREQUENCY (Hz)
10
0
POWER SUPPLY REJECTION RATIO (dB)
20
40
60
80
120
100 1k 10k 100k
1352/53 G20
1M 10M
100
TA = 25°C
VS = ±15V
–PSRR = +PSRR
SUPPLY VOLTAGE (±V)
0
2.00
GAIN BANDWIDTH (MHz)
PHASE MARGIN (DEG)
2.25
2.75
3.00
4.50
3.75
10 20
1352/53 G19
2.50
4.00
4.25
3.50
3.25
30
32
36
38
50
44
34
46
48
42
40
515
TA = 25°C
PHASE MARGIN
GAIN BANDWIDTH
Gain Bandwidth and Phase Margin
vs Supply Voltage
Power Supply Rejection Ratio
vs Frequency
Common Mode Rejection Ratio
vs Frequency
FREQUENCY (Hz)
100
0
COMMON MODE REJECTION RATIO (dB)
20
40
60
80
100
120
1k 10k 100k 1M
1352/53 G21
10M
TA = 25°C
VS = ±15V
8
LT1352/LT1353
13523fa
TYPICAL PERFORMANCE CHARACTERISTICS
UW
SUPPLY VOLTAGE (±V)
0
0
SLEW RATE (V/µs)
50
100
150
200
510
1352/53 G22
15
T
A
= 25°C
A
V
= –1
R
F
= R
G
= 5k
SR = (SR
+
+ SR
–
)/2
Slew Rate vs Supply Voltage
INPUT LEVEL (VP-P)
0
SLEW RATE (V/µs)
75
100
125
12 20
1352/53 G24
50
25
048 16
150
175
200
24
TA = 25°C
VS = ±15V
AV = –1
RFB = RG = 5k
SR = (SR+ + SR–)/2
TEMPERATURE (°C)
–50 –25
0
SLEW RATE (V/µs)
100
250
050 75
1352/53 G23
50
200
150
25 100 125
A
V
= –1
R
F
= R
G
= R
L
= 5k
SR = (SR
+
+ SR
–
)/2
V
S
= ±15V
V
S
= ±5V
Slew Rate vs Temperature Slew Rate vs Input Level
Total Harmonic Distortion
vs Frequency
FREQUENCY (Hz)
10
TOTAL HARMONIC DISTORTION (%)
0.01
0.1
1
100 1k 10k 100k
1352/53 G25
0.001
TA = 25°C
VS = ±15V
RL = 5k
VO = 2VP-P
AV = –1
AV = 1
Undistorted Output Swing
vs Frequency (±15V)
FREQUENCY (Hz)
10k
0
OUTPUT VOLTAGE (V
P-P
)
5
10
15
20
30
100k 1M
1352/53 G26
25
V
S
= ±15V
R
L
= 5k
THD = 1%
A
V
= –1
A
V
= 1
Undistorted Output Swing
vs Frequency (±5V)
FREQUENCY (Hz)
10k
0
OUTPUT VOLTAGE (V
P-P
)
2
4
6
8
1
3
5
7
9
100k 1M
1352/53 G27
10
V
S
= ±5V
R
L
= 5k
THD = 1%
A
V
= 1
A
V
= –1
2nd and 3rd Harmonic Distortion
vs Frequency Capacitive Load Handling
FREQUENCY (Hz)
100k
HARMONIC DISTORTION (dB)
–30
–40
–50
–60
–70
–80
–90 1M
1352/53 G28
3RD HARMONIC
2ND HARMONIC
V
S
= ±15V
A
V
= 1
R
L
= 5k
V
O
= 2V
P-P
FREQUENCY (Hz)
–100
CROSSTALK (dB)
–90
–70
–50
–40
100 10k 100k 10M
1352/53 G29
–110
1k 1M
–60
–80
–120
T
A
= 25°C
A
V
= 1
R
L
= 1k
V
IN
= 15dBm
CAPACITIVE LOAD (F)
10p
40
OVERSHOOT (%)
50
60
70
80
100p 1n 10n 0.1µ1µ
1352/53 G30
30
20
10
0
90
100 TA = 25°C
VS = ±15V
RL = 5k
AV = 1
AV = –1
Crosstalk vs Frequency
9
LT1352/LT1353
13523fa
TYPICAL PERFORMANCE CHARACTERISTICS
UW
Small-Signal Transient
(AV = 1)
Small-Signal Transient
(AV = – 1)
Small-Signal Transient
(AV = – 1, CL = 1000pF)
1352/53 G331352/53 G321352/53 G31
Large-Signal Transient
(AV = 1)
Large-Signal Transient
(AV = –1)
Large-Signal Transient
(AV = 1, CL = 10,000pF)
1352/53 G361352/53 G351352/53 G34
APPLICATIONS INFORMATION
WUU U
Layout and Passive Components
The LT1352/LT1353 amplifiers are easy to use and toler-
ant 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 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
>
(R
G
)(C
IN
/R
F
), 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, C
F
should be greater than or equal to C
IN
. An
example would be an I-to-V converter as shown in the
Typical Applications section.
Capacitive Loading
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.
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
10
LT1352/LT1353
13523fa
APPLICATIONS INFORMATION
WUU U
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 in-
crease, 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 applica-
tion with large, sustained differential inputs. Under
normal, closed-loop operation, an increase of power dis-
sipation 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 C
T
. 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 capaci-
tance 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 differen-
tial 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 large-
signal performance and the small-signal performance
both look like a single pole response.
Capacitive load compensation is provided by the R
C
,
C
C
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 T
J
is calculated from the
ambient temperature T
A
and power dissipation P
D
as
follows:
LT1352CN8: T
J
= T
A
+ (P
D
)(130°C/W)
LT1352CS8: T
J
= T
A
+ (P
D
)(190°C/W)
LT1353CS: T
J
= T
A
+ (P
D
)(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 P
D(MAX)
is:
P
D(MAX)
=(V
+
– V
–
)(I
S(MAX)
) + (V
+
/2)
2
/R
L
or
(V
+
– V
–
)(I
S(MAX)
) + (V
+
– V
MAX
)(I
MAX
)
Example: LT1353 in S14 at 85°C, V
S
= ±15V, R
L
= 500Ω,
V
OUT
= ±5V (±10mA)
P
D(MAX)
= (30V)(380µA) + (15V – 5V)(10mA) = 111mW
T
J
= 85°C + (4)(111mW)(150°C/W) = 152°C
11
LT1352/LT1353
13523fa
SI PLIFIED SCHE ATIC
WW
R3
R6
R7
R
C
R2
R5
R4
Q21
OUTPUT
1352/53 SS
Q22
Q13
Q15
Q18
+IN
–IN
V
+
V
–
Q12
Q11
Q9
Q17
Q16
Q10
Q14 Q23
C1
C2
C
C
C
T
Q1
Q2
Q4
Q3
R1
1k
Q8
Q7
Q6
Q5
Q19
Q20
Q24
12
LT1352/LT1353
13523fa
TYPICAL APPLICATIONS
U
–
+
1/2
LT1352
1.5k 10k
10k
1N5712
BPV22NF V
OUT
1352/53 TA05
10nF
10k
10nF
–
+
1/2
LT1352
DAC I-to-V Converter
400kHz Photodiode Preamp with 10kHz Highpass Loop
–
+
1/2
LT1352
565A TYPE
12
DAC
INPUTS
5k
5k
10pF
V
OUT
1352/53 TA03
V
OS
+ I
OS
(5kΩ) + < 0.5LSB
V
OUT
A
VOL
13
LT1352/LT1353
13523fa
N8 Package
8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
PACKAGE DESCRIPTION
U
N8 1002
.065
(1.651)
TYP
.045 – .065
(1.143 – 1.651)
.130 ± .005
(3.302 ± 0.127)
.020
(0.508)
MIN
.018 ± .003
(0.457 ± 0.076)
.120
(3.048)
MIN
12 34
8765
.255 ± .015*
(6.477 ± 0.381)
.400*
(10.160)
MAX
.008 – .015
(0.203 – 0.381)
.300 – .325
(7.620 – 8.255)
.325 +.035
–.015
+0.889
–0.381
8.255
()
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)
.100
(2.54)
BSC
14
LT1352/LT1353
13523fa
.016 – .050
(0.406 – 1.270)
.010 – .020
(0.254 – 0.508)× 45°
0°– 8° TYP
.008 – .010
(0.203 – 0.254)
SO8 0303
.053 – .069
(1.346 – 1.752)
.014 – .019
(0.355 – 0.483)
TYP
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
1234
.150 – .157
(3.810 – 3.988)
NOTE 3
8765
.189 – .197
(4.801 – 5.004)
NOTE 3
.228 – .244
(5.791 – 6.197)
.245
MIN .160 ±.005
RECOMMENDED SOLDER PAD LAYOUT
.045 ±.005
.050 BSC
.030 ±.005
TYP
INCHES
(MILLIMETERS)
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)
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
PACKAGE DESCRIPTION
U
15
LT1352/LT1353
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 represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
S Package
14-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
1
N
234
.150 – .157
(3.810 – 3.988)
NOTE 3
14 13
.337 – .344
(8.560 – 8.738)
NOTE 3
.228 – .244
(5.791 – 6.197)
12 11 10 9
567
N/2
8
.016 – .050
(0.406 – 1.270)
.010 – .020
(0.254 – 0.508)× 45°
0° – 8° TYP
.008 – .010
(0.203 – 0.254)
S14 0502
.053 – .069
(1.346 – 1.752)
.014 – .019
(0.355 – 0.483)
TYP
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
.245
MIN
N
1 2 3 N/2
.160 ±.005
RECOMMENDED SOLDER PAD LAYOUT
.045 ±.005
.050 BSC
.030 ±.005
TYP
INCHES
(MILLIMETERS)
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)
PACKAGE DESCRIPTION
U
16
LT1352/LT1353
13523fa
–
+
1/2
LT1352
11.3k
5.49k
13.3k
4.64k
4.64k
5.49k
220pF
V
OUT
V
IN
1352/53 TA04
470pF
2200pF
4700pF
–
+
1/2
LT1352
20kHz, 4th Order Butterworth Filter
TYPICAL APPLICATIONS
U
LINEAR TECHNOLOGY CORPORATION 1996
LT/TP 0603 1K REV A • PRINTED IN USA
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LT1351 250µA, 3MHz, 200V/µs Op Amp Good DC Precision, C-Load Stable, Power Saving Shutdown
LT1354/55/56 Single/Dual/Quad 1mA, 12MHz, 400V/µs Op Amp Good DC Precision, Stable with All Capacitive Loads
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
