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LT1355/LT1356 Dual and Quad 12MHz, 400V/s Op Amps
FEATURES
s s s s s s s s s s s s s s s
DESCRIPTIO
12MHz Gain Bandwidth 400V/s Slew Rate 1.25mA Maximum Supply Current per Amplifier Unity-Gain Stable C-LoadTM Op Amp Drives All Capacitive Loads 10nV/Hz Input Noise Voltage 800V Maximum Input Offset Voltage 300nA Maximum Input Bias Current 70nA Maximum Input Offset Current 12V/mV Minimum DC Gain, RL=1k 230ns Settling Time to 0.1%, 10V Step 280ns Settling Time to 0.01%, 10V Step 12.5V Minimum Output Swing into 500 3V Minimum Output Swing into 150 Specified at 2.5V, 5V, and 15V
The LT1355/LT1356 are dual and quad low power high speed operational amplifiers with outstanding AC and DC performance. The amplifiers feature much lower supply current and higher slew rate than devices with comparable bandwidth. The circuit topology is a voltage feedback amplifier with matched high impedance inputs and the slewing performance of a current feedback amplifier. The high slew rate and single stage design provide excellent settling characteristics which make the circuit an ideal choice for data acquisition systems. Each output drives a 500 load to 12.5V with 15V supplies and a 150 load to 3V on 5V supplies. The amplifiers are stable with any capacitive load making them useful in buffer applications. The LT1355/LT1356 are members of a family of fast, high performance amplifiers using this unique topology and employing Linear Technology Corporation's advanced bipolar complementary processing. For a single amplifier version of the LT1355/LT1356 see the LT1354 data sheet. For higher bandwidth devices with higher supply currents see the LT1357 through LT1365 data sheets. Bandwidths of 25MHz, 50MHz, and 70MHz are available with 2mA, 4mA, and 6mA of supply current per amplifier. Singles, duals, and quads of each amplifier are available.
, LTC and LT are registered trademarks of Linear Technology Corporation. C-Load is a trademark of Linear Technology Corporation.
APPLICATIO S
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Wideband Amplifiers Buffers Active Filters Data Acquisition Systems Photodiode Amplifiers
TYPICAL APPLICATIO
100kHz, 4th Order Butterworth Filter
6.81k 100pF
5.23k 47pF
6.81k VIN
11.3k 330pF
-
1/2 LT1355
5.23k
10.2k 1000pF
-
1/2 LT1355 VOUT
+
+
1355/1356 TA01
U
AV = -1 Large-Signal Response
1355/1356 TA02
U
U
1
LT1355/LT1356
ABSOLUTE MAXIMUM RATINGS
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
PACKAGE/ORDER INFORMATION
TOP VIEW OUT A -IN A +IN A V- 1 2 A 3 4 N8 PACKAGE 8-LEAD PDIP B 6 5 -IN B +IN B 8 7 V+ OUT B
ORDER PART NUMBER LT1355CN8
TJMAX = 150C, JA = 130C/ W
TOP VIEW
OUT A
1 2 3 4 5 6 7 B C A D
14 OUT D 13 -IN D 12 +IN D 11 V - 10 +IN C 9 8
-IN C
OUT C
ORDER PART NUMBER LT1356CN
-IN A +IN A V+ +IN B -IN B
OUT B
N PACKAGE 14-LEAD PDIP
TJMAX = 150C, JA = 110C/ W
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
SYMBOL VOS PARAMETER Input Offset Voltage CONDITIONS
TA = 25C, VCM = 0V unless otherwise noted.
VSUPPLY 15V 5V 2.5V 2.5V to 15V 2.5V to 15V MIN TYP 0.3 0.3 0.4 20 80 10 0.6 70 160 11 3 MAX 0.8 0.8 1.0 70 300 UNITS mV mV mV nA nA nV/Hz pA/Hz M M pF
IOS IB en in RIN CIN
Input Offset Current Input Bias Current Input Noise Voltage Input Noise Current Input Resistance Input Resistance Input Capacitance f = 10kHz f = 10kHz VCM = 12V Differential
2
U
U
W
WW U
W
(Note 1)
Operating Temperature Range (Note 7) .. - 40C to 85C Specified Temperature Range (Note 8) ... - 40C to 85C Maximum Junction Temperature (See Below) Plastic Package ................................................ 150C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
TOP VIEW OUT A -IN A +IN A V
-
1 2 A 3 4 S8 PACKAGE 8-LEAD PLASTIC SO B
8 7 6 5
V+ OUT B -IN B +IN B
ORDER PART NUMBER LT1355CS8 S8 PART MARKING 1355 ORDER PART NUMBER LT1356CS
TJMAX = 150C, JA = 190C/ W
TOP VIEW
OUT A
1 2 3 4 5 6 7 8 B C A D
16 OUT D 15 -IN D 14 +IN D 13 V - 12 +IN C 11 -IN C 10 OUT C 9
NC
-IN A +IN A V+ +IN B -IN B
OUT B NC
S PACKAGE 16-LEAD PLASTIC SO
TJMAX = 150C, JA = 150C/ W
2.5V to 15V 2.5V to 15V 15V 15V 15V
LT1355/LT1356
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER Input Voltage Range
+
TA = 25C, VCM = 0V unless otherwise noted.
VSUPPLY 15V 5V 2.5V 15V 5V 2.5V MIN 12.0 2.5 0.5 TYP 13.4 3.5 1.1 -13.2 -12.0 -3.4 -2.5 -0.9 -0.5 83 78 68 92 15V 15V 5V 5V 5V 2.5V 15V 15V 5V 5V 2.5V 15V 5V 15V 15V 5V 15V 5V 15V 5V 2.5V 15V 5V 15V 5V 15V 5V 15V 15V 5V 5V 15V 5V 15V 5V 15V 15V 15V 5V 100 9.0 7.5 12 5 12 5 1 5 13.3 12.5 3.5 3.0 1.3 25 20 30 200 70 97 84 75 106 36 15 36 15 4 20 13.8 13.0 4.0 3.3 1.7 30 25 42 400 120 6.4 6.4 12.0 10.5 9.0 14 17 20 18 16 19 230 280 240 380 2.2 2.1 3.1 3.1 0.7 113 1.0 0.9 1.25 1.20 MAX UNITS V V V V V V dB dB dB dB V/mV V/mV V/mV V/mV V/mV V/mV V V V V V mA mA mA V/s V/s MHz MHz MHz MHz MHz ns ns % % ns ns ns ns ns ns % % Deg Deg dB mA mA
CONDITIONS
Input Voltage Range -
CMRR
Common Mode Rejection Ratio
VCM = 12V VCM = 2.5V VCM = 0.5V VS = 2.5V to 15V VOUT = 12V, RL = 1k VOUT = 10V, RL = 500 VOUT = 2.5V, RL = 1k VOUT = 2.5V, RL = 500 VOUT = 2.5V, RL = 150 VOUT = 1V, RL = 500 RL = 1k, VIN = 40mV RL = 500, VIN = 40mV RL = 500, VIN = 40mV RL = 150, VIN = 40mV RL = 500, VIN = 40mV VOUT = 12.5V VOUT = 3V VOUT = 0V, VIN = 3V AV = - 2, (Note 4) 10V Peak, (Note 5) 3V Peak, (Note 5) f = 200kHz, RL = 2k
15V 5V 2.5V
PSRR AVOL
Power Supply Rejection Ratio Large-Signal Voltage Gain
VOUT
Output Swing
IOUT ISC SR
Output Current Short-Circuit Current Slew Rate Full Power Bandwidth
GBW
Gain Bandwidth
tr, tf
Rise Time, Fall Time Overshoot Propagation Delay
AV = 1, 10%-90%, 0.1V AV = 1, 0.1V 50% VIN to 50% VOUT, 0.1V 10V Step, 0.1%, AV = -1 10V Step, 0.01%, AV = -1 5V Step, 0.1%, AV = -1 5V Step, 0.01%, AV = -1 f = 3.58MHz, AV = 2, RL = 1k f = 3.58MHz, AV = 2, RL = 1k AV = 1, f = 100kHz VOUT = 10V, RL = 500 Each Amplifier Each Amplifier
ts
Settling Time
Differential Gain Differential Phase RO IS Output Resistance Channel Separation Supply Current
3
LT1355/LT1356
0C TA 70C, VCM = 0V unless otherwise noted.
SYMBOL VOS PARAMETER Input Offset Voltage
ELECTRICAL CHARACTERISTICS
CONDITIONS
The q denotes the specifications which apply over the temperature range
VSUPPLY 15V 5V 2.5V
q q q q q q q q q q
MIN
TYP
MAX 1.0 1.0 1.2
UNITS mV mV mV V/C nA nA dB dB dB dB V/mV V/mV V/mV V/mV V/mV V/mV V V V V V mA mA mA V/s V/s MHz MHz dB
Input VOS Drift IOS IB CMRR Input Offset Current Input Bias Current Common Mode Rejection Ratio
(Note 6)
2.5V to 15V 2.5V to 15V 2.5V to 15V
5
8 100 450
VCM = 12V VCM = 2.5V VCM = 0.5V VS = 2.5V to 15V VOUT = 12V, RL = 1k VOUT = 10V, RL = 500 VOUT = 2.5V, RL = 1k VOUT = 2.5V, RL = 500 VOUT = 2.5V, RL = 150 VOUT = 1V, RL = 500 RL = 1k, VIN = 40mV RL = 500, VIN = 40mV RL = 500, VIN = 40mV RL = 150, VIN = 40mV RL = 500, VIN = 40mV VOUT = 12V VOUT = 2.8V VOUT = 0V, VIN = 3V AV = - 2, (Note 4) f = 200kHz, RL = 2k VOUT = 10V, RL = 500 Each Amplifier Each Amplifier
15V 5V 2.5V 15V 15V 5V 5V 5V 2.5V 15V 15V 5V 5V 2.5V 15V 5V 15V 15V 5V 15V 5V 15V 15V 5V
81 77 67 90 10.0 3.3 10.0 3.3 0.6 3.3 13.2 12.0 3.4 2.8 1.2 24.0 18.7 24 150 60 7.5 6.0 98 1.45 1.40
PSRR AVOL
Power Supply Rejection Ratio Large-Signal Voltage Gain
q q q q q q q q q q q q q q q q q q q q q
VOUT
Output Swing
IOUT ISC SR GBW
Output Current Short-Circuit Current Slew Rate Gain Bandwidth Channel Separation
IS
Supply Current
mA mA
The q denotes the specifications which apply over the temperature range - 40C TA 85C, VCM = 0V unless otherwise noted. (Note 8)
SYMBOL VOS PARAMETER Input Offset Voltage CONDITIONS VSUPPLY 15V 5V 2.5V 2.5V to 15V 2.5V to 15V 2.5V to 15V VCM = 12V VCM = 2.5V VCM = 0.5V VS = 2.5V to 15V VOUT = 12V, RL = 1k VOUT = 10V, RL = 500 VOUT = 2.5V, RL = 1k VOUT = 2.5V, RL = 500 15V 15V 5V 5V 15V 5V 2.5V MIN
q q q q q q q q q q q q q q
TYP
MAX 1.5 1.5 1.7 8 200 550
UNITS mV mV mV V/C nA nA dB dB dB dB V/mV V/mV V/mV V/mV
Input VOS Drift IOS IB CMRR Input Offset Current Input Bias Current Common Mode Rejection Ratio
(Note 6)
5
80 76 66 90 7.0 1.7 7.0 1.7
PSRR AVOL
Power Supply Rejection Ratio Large-Signal Voltage Gain
4
LT1355/LT1356
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
The q denotes the specifications which apply over the temperature range - 40C TA 85C, VCM = 0V unless otherwise noted. (Note 8)
CONDITIONS VOUT = 2.5V, RL = 150 VOUT = 1V, RL = 500 VSUPPLY 5V 2.5V 15V 15V 5V 5V 2.5V 15V 5V 15V 15V 5V 15V 5V 15V 15V 5V
q q q q q q q q q q q q q q q q q
MIN 0.4 1.7 13.0 11.5 3.4 2.6 1.2 23.0 17.3 23 120 50 7.0 5.5 98
TYP
MAX
UNITS V/mV V/mV V V V V V mA mA mA V/s V/s MHz MHz dB
VOUT
Output Swing
RL = 1k, VIN = 40mV RL = 500, VIN = 40mV RL = 500, VIN = 40mV RL = 150, VIN = 40mV RL = 500, VIN = 40mV VOUT = 11.5V VOUT = 2.6V VOUT = 0V, VIN = 3V AV = - 2, (Note 4) f = 200kHz, RL = 2k VOUT = 10V, RL = 500 Each Amplifier Each Amplifier
IOUT ISC SR GBW
Output Current Short-Circuit Current Slew Rate Gain Bandwidth Channel Separation
IS
Supply Current
1.50 1.45
mA mA
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 10V on the output with 6V input for 15V supplies and 1V on the output with 1.75V input for 5V supplies.
Note 5: Full power bandwidth is calculated from the slew rate measurement: FPBW = (SR)/2VP. Note 6: This parameter is not 100% tested. Note 7: The LT1355C/LT1356C are guaranteed functional over the operating temperature range of -40C to 85C. Note 8: The LT1355C/LT1356C are guaranteed to meet specified performance from 0C to 70C. The LT1355C/LT1356C are designed, characterized and expected to meet specified performance from - 40C to 85C, but are not tested or QA sampled at these temperatures. For guaranteed I-grade parts, consult the factory.
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Supply Voltage and Temperature
1.4 V+ - 0.5 TA = 25C VOS < 1mV
COMMON MODE RANGE (V)
SUPPLY CURRENT (mA)
125C 1.0 25C
-1.5 -2.0
INPUT BIAS CURRENT (nA)
1.2
0.8
0.6
0.4 0 5 10 15 SUPPLY VOLTAGE (V) 20
1355/1356 G01
UW
- 55C
Input Common Mode Range vs Supply Voltage
200
Input Bias Current vs Input Common Mode Voltage
VS = 15V TA = 25C IB+ + IB- IB = -------- 2
-1.0
150
100
2.0 1.5 1.0 0.5 V- 0 5 10 15 SUPPLY VOLTAGE (V) 20
1355/1356 G02
50
0
-50 -15
-10 -5 0 5 10 INPUT COMMON MODE VOLTAGE (V)
15
1355/1356 G03
5
LT1355/LT1356 TYPICAL PERFORMANCE CHARACTERISTICS
Input Bias Current vs Temperature
200 175
INPUT BIAS CURRENT (nA)
INPUT VOLTAGE NOISE (nV/Hz)
125 100 75 50 25 0 -50 -25 0 25 50 75 TEMPERATURE (C) 100 125
OPEN-LOOP GAIN (dB)
150
VS = 15V IB+ + IB- IB = -------- 2
Open-Loop Gain vs Temperature
97 96 95 VS = 15V RL = 1k VO = 12V
OUTPUT VOLTAGE SWING (V)
OUTPUT VOLTAGE SWING (V)
OPEN-LOOP GAIN (dB)
94 93 92 91 90 89 88 - 50 -25 0 25 50 75 TEMPERATURE (C) 100 125
Output Short-Circuit Current vs Temperature
65
OUTPUT SHORT-CIRCUIT CURRENT (mA)
60 55 50 45 SINK 40 35 30 25 20 -50 -25 SOURCE
VS = 5V
OUTPUT SWING (V)
2 0 -2 -4 10mV -6 -8 -10
1mV
OUTPUT SWING (V)
0 25 50 75 TEMPERATURE (C)
6
UW
1355/1356 G04
1355/1356 G07
Input Noise Spectral Density
100 VS = 15V TA = 25C AV = 101 RS = 100k in en 1 10
Open-Loop Gain vs Resistive Load
100 TA = 25C VS = 15V VS = 5V
INPUT CURRENT NOISE (pA/Hz)
90
80
10
70
60
1 10 100 1k 10k FREQUENCY (Hz)
0.1 100k
1355/1356 G05
50 10 100 1k LOAD RESISTANCE () 10k
1355/1356 G06
Output Voltage Swing vs Supply Voltage
V+ TA = 25C -1 -2 RL = 500 -3 3 2 1 V- 0 5 10 15 SUPPLY VOLTAGE (V) 20
1355/1356 G08
Output Voltage Swing vs Load Current
V +-0.5 -1.0 -1.5 -2.0 -2.5 85C 2.5 2.0 1.5 1.0 V - + 0.5 -50 -40 -30 -20 -10 0 10 20 30 40 50 OUTPUT CURRENT (mA)
1355/1356 G09
RL = 1k
VS = 5V VIN = 100mV -40C
85C
25C
RL = 500
25C -40C
RL = 1k
Settling Time vs Output Step (Noninverting)
10 8 6 4 10mV VS = 15V AV = 1
10 8 6 4 2 0 -2 -4 -6 -8 -10
Settling Time vs Output Step (Inverting)
VS = 15V AV = -1 10mV 1mV
1mV 10mV
1mV
100
125
50
100
150 200 250 SETTLING TIME (ns)
300
350
50
100
150 200 250 SETTLING TIME (ns)
300
350
1355/1356 G10
1355/1356 G11
1355/1356 G12
LT1355/LT1356 TYPICAL PERFORMANCE CHARACTERISTICS
Output Impedance vs Frequency
1k AV = 100 VS = 15V TA = 25C
VOLTAGE MAGNITUDE (dB)
10 8 6 4 2 0 -2 -4 -6 -8 C=0 VS = 15V TA = 25C AV = -1
OUTPUT IMPEDANCE ()
100
GAIN BANDWIDTH (MHz)
10 AV = 10 1 AV = 1 0.1
0.01 10k
100k
1M 10M FREQUENCY (Hz)
Gain Bandwidth and Phase Margin vs Temperature
18 17 PHASE MARGIN VS = 15V PHASE MARGIN VS = 5V 52 50 48
5 4 3
GAIN BANDWIDTH (MHz)
16 15 14 13 12 11 10 9 GAIN BANDWIDTH VS = 5V -25
GAIN (dB)
GAIN (dB)
GAIN BANDWIDTH VS = 15V
8 - 50
0 25 50 75 TEMPERATURE (C)
Gain and Phase vs Frequency
70 60 50
GAIN (dB)
PHASE VS = 15V VS = 15V GAIN VS = 5V VS = 5V TA = 25C AV = -1 RF = RG = 2k 100k 1M 10M FREQUENCY (Hz)
100 80 60 40 20 0
PHASE (DEG)
COMMON-MODE REJECTION RATIO (dB)
POWER SUPPLY REJECTION RATIO (dB)
40 30 20 10 0 -10 10k
UW
1355/1356 G13
Frequency Response vs Capacitive Load
18 17
C = 1000pF C = 500pF C = 100pF C = 50pF
Gain Bandwidth and Phase Margin vs Supply Voltage
50 48 PHASE MARGIN 46
PHASE MARGIN (DEG)
16 15 14 13 12 11 10 9 8
44 42 40 38 GAIN BANDWIDTH 36 34 TA = 25C 0 5 10 15 SUPPLY VOLTAGE (V) 20
1355/1356 G15
32 30
100M
-10 100k
1M 10M FREQUENCY (Hz)
100M
1355/1356 G19
Frequency Response vs Supply Voltage (AV = 1)
5
TA = 25C AV = 1 RL = 2k
Frequency Response vs Supply Voltage (AV = -1)
4 3 2
15V
TA = 25C AV = -1 RF = RG = 2k
PHASE MARGIN (DEG)
46 44 42 40 38 36 34
2 1 0 -1 -2 -3 -4 -5 100k 5V 2.5V
1 0 -1 -2 -3 -4 2.5V 1M 10M FREQUENCY (Hz) 15V 100M
1355/1356 G18
5V
100
32 125
1M 10M FREQUENCY (Hz)
100M
1355/1356 G17
-5 100k
1355/1356 G16
Power Supply Rejection Ratio vs Frequency
120 100 VS = 15V TA = 25C 80 +PSRR - PSRR 60 120 100 80 60 40 20 0 1k 10k 100k 1M FREQUENCY (Hz) 10M 100M
Common Mode Rejection Ratio vs Frequency
VS = 15V TA = 25C
40
20
100M
1355/1356 G14
0 100
1k
10k
100k 1M FREQUENCY (Hz)
10M
100M
1355/1356 G20
1355/1356 G21
7
LT1355/LT1356 TYPICAL PERFORMANCE CHARACTERISTICS
Slew Rate vs Supply Voltage
600 500
SLEW RATE (V/s)
SLEW RATE (V/s)
400 300 200 100 0 0
250 200 150 100 50 -50
AV = -2 SR+ + SR- SR = ---------- 2
SLEW RATE (V/s)
TA = 25C AV = -1 RF = RG = 2k SR+ + SR- SR = ---------- 2
5 10 SUPPLY VOLTAGE (V)
Total Harmonic Distortion vs Frequency
0.1 30 TA = 25C VO = 3VRMS RL = 2k 0.01 25 OUTPUT VOLTAGE (VP-P) 20
TOTAL HARMONIC DISTORTION (%)
OUTPUT VOLTAGE (VP-P)
AV = -1 0.001 AV = 1
0.0001 10 100 1k 10k FREQUENCY (Hz) 100k
1355/1356 G25
2nd and 3rd Harmonic Distortion vs Frequency
-20 -30 -40 3RD HARMONIC -50 -60 2ND HARMONIC -70 -80 100k 200k VS = 15V VO = 2VP-P RL = 2k AV = 2
CROSSTALK (dB)
HARMONIC DISTORTION (dB)
-70 -80 -90
OVERSHOOT (%)
400k 1M 2M FREQUENCY (Hz)
8
UW
1355/1356 G22
Slew Rate vs Temperature
350 300 VS = 15V 500
Slew Rate vs Input Level
TA = 25C VS = 15V AV = -1 RF = RG = 2k SR+ + SR- SR = ---------- 2
400
300
200
VS = 5V
100
0 -25 0 25 50 75 TEMPERATURE (C) 100 125 0 2 4 6 8 10 12 14 16 18 INPUT LEVEL (VP-P) 20
15
1355/1356 G23
1355/1356 G24
Undistorted Output Swing vs Frequency (15V)
10 AV = -1 8
Undistorted Output Swing vs Frequency (5V)
AV = -1 AV = 1
AV = 1 15 10 5 VS = 15V RL = 5k AV = 1, 1% MAX DISTORTION AV = -1, 4% MAX DISTORTION 1M FREQUENCY (Hz) 10M
1355/1356 G26
6
4
2
VS = 5V RL = 5k AV = 1, 2% MAX DISTORTION AV = -1, 3% MAX DISTORTION 1M FREQUENCY (Hz) 10M
1355/1356 G27
0 100k
0 100k
Crosstalk vs Frequency
-40 -50 -60 TA = 25C VIN = 0dBm RL = 500 AV = 1
100
Capacitive Load Handling
TA = 25C VS = 15V
AV = 1 50 AV = -1
-100 -110
4M
10M
-120 100k
1M 10M FREQUENCY (Hz)
100M
1355/1356 G29
0 10p
100p
1000p 0.01 0.1 CAPACITIVE LOAD (F)
1
1355/1356 G28
1355/1356 G30
LT1355/LT1356 TYPICAL PERFORMANCE CHARACTERISTICS
Small-Signal Transient (AV = 1) Small-Signal Transient (AV = -1) Small- Signal Transient (AV = -1, CL = 1000pF)
1355/1356 G31
Large-Signal Transient (AV = 1)
1355/1356 G34
APPLICATIONS INFORMATION
Layout and Passive Components The LT1355/LT1356 amplifiers are easy to use and tolerant of less than ideal layouts. For maximum performance (for example, fast 0.01% settling) use a ground plane, short lead lengths, and RF-quality bypass capacitors (0.01F to 0.1F). For high drive current applications use low ESR bypass capacitors (1F to 10F tantalum). The parallel combination of the feedback resistor and gain setting resistor on the inverting input combine with the input capacitance to form a pole which can cause peaking or oscillations. If feedback resistors greater than 5k are used, a parallel capacitor of value CF > RG x CIN/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.
U
W
UW
1355/1356 G32
1355/1356 G33
Large-Signal Transient (AV = -1)
Large-Signal Transient (AV = 1, CL = 10,000pF)
1355/1356 G35
1355/1356 G36
U
U
9
LT1355/LT1356
APPLICATIONS INFORMATION
Capacitive Loading The LT1355/LT1356 are stable with any capacitive load. As the capacitive load increases, both the bandwidth and phase margin decrease so there will be peaking in the frequency domain and in the transient response. Coaxial cable can be driven directly, but for best pulse fidelity a resistor of value equal to the characteristic impedance of the cable (i.e., 75) should be placed in series with the output. The other end of the cable should be terminated with the same value resistor to ground. Input Considerations Each of the LT1355/LT1356 inputs is the base of an NPN and a PNP transistor whose base currents are of opposite polarity and provide first-order bias current cancellation. Because of variation in the matching of NPN and PNP beta, the polarity of the input bias current can be positive or negative. The offset current does not depend on NPN/PNP beta matching and is well controlled. The use of balanced source resistance at each input is recommended for applications where DC accuracy must be maximized. The inputs can withstand transient differential input voltages up to 10V without damage and need no clamping or source resistance for protection. Differential inputs, however, generate large supply currents (tens of mA) as required for high slew rates. If the device is used with sustained differential inputs, the average supply current will increase, excessive power dissipation will result and the part may be damaged. The part should not be used as a comparator, peak detector or other open-loop application with large, sustained differential inputs. Under normal, closed-loop operation, an increase of power dissipation is only noticeable in applications with large slewing outputs and is proportional to the magnitude of the differential input voltage and the percent of the time that the inputs are apart. Measure the average supply current for the application in order to calculate the power dissipation. Circuit Operation The LT1355/LT1356 circuit topology is a true voltage feedback amplifier that has the slewing behavior of a current feedback amplifier. The operation of the circuit can be understood by referring to the simplified schematic. The inputs are buffered by complementary NPN and PNP emitter followers which drive an 800 resistor. The input voltage appears across the resistor generating currents which are mirrored into the high impedance node. Complementary followers form an output stage which buffers the gain node from the load. The bandwidth is set by the input resistor and the capacitance on the high impedance node. The slew rate is determined by the current available to charge the gain node capacitance. This current is the differential input voltage divided by R1, so the slew rate is proportional to the input. Highest slew rates are therefore seen in the lowest gain configurations. For example, a 10V output step in a gain of 10 has only a 1V input step, whereas the same output step in unity gain has a 10 times greater input step. The curve of Slew Rate vs Input Level illustrates this relationship. The LT1355/ LT1356 are tested for slew rate in a gain of -2 so higher slew rates can be expected in gains of 1 and -1, and lower slew rates in higher gain configurations. 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.
10
U
W
U
U
LT1355/LT1356
APPLICATIONS INFORMATION
Power Dissipation The LT1355/LT1356 combine high speed and large output drive in small packages. Because of the wide supply voltage range, it is possible to exceed the maximum junction temperature under certain conditions. Maximum junction temperature (TJ) is calculated from the ambient temperature (TA) and power dissipation (PD) as follows: LT1355CN8: LT1355CS8: LT1356CN: LT1356CS: TJ = TA + (PD x 130C/W) TJ = TA + (PD x 190C/W) TJ = TA + (PD x 110C/W) TJ = TA + (PD x 150C/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: LT1356 in S16 at 70C, VS = 15V, RL = 1k PDMAX = (30V)(1.45mA) + (7.5V)2/1kW = 99.8mW TJMAX = 70C + (4 x 99.8mW)(150C/W) = 130C
SI PLIFIED SCHE ATIC
V+
R1 800 -IN
V-
1355/1356 SS01
U
W
W
U
U
W
+IN C
RC OUT CC
11
LT1355/LT1356
PACKAGE DESCRIPTIO
0.300 - 0.325 (7.620 - 8.255)
0.009 - 0.015 (0.229 - 0.381)
(
+0.035 0.325 -0.015 8.255 +0.889 -0.381
)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
12
U
Dimensions in inches (millimeters) unless otherwise noted.
N8 Package 8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.400* (10.160) MAX 8 7 6 5
0.255 0.015* (6.477 0.381)
1
2
3
4 0.130 0.005 (3.302 0.127)
0.045 - 0.065 (1.143 - 1.651)
0.065 (1.651) TYP 0.125 (3.175) 0.020 MIN (0.508) MIN 0.018 0.003 (0.457 0.076)
N8 1098
0.100 (2.54) BSC
LT1355/LT1356
PACKAGE DESCRIPTIO
0.300 - 0.325 (7.620 - 8.255)
0.009 - 0.015 (0.229 - 0.381) 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) +0.035 0.325 -0.015 +0.889 8.255 -0.381
(
)
U
Dimensions in inches (millimeters) unless otherwise noted.
N Package 14-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.770* (19.558) MAX 14 13 12 11 10 9 8
0.255 0.015* (6.477 0.381)
1 0.130 0.005 (3.302 0.127) 0.020 (0.508) MIN
2
3
4
5
6
7
0.045 - 0.065 (1.143 - 1.651)
0.065 (1.651) TYP 0.125 (3.175) MIN 0.018 0.003 (0.457 0.076)
N14 1098
13
LT1355/LT1356
PACKAGE DESCRIPTIO
0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0- 8 TYP
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
0.016 - 0.050 (0.406 - 1.270)
14
U
Dimensions 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) 8 7 6 5
0.228 - 0.244 (5.791 - 6.197)
0.150 - 0.157** (3.810 - 3.988)
1
2
3
4
0.053 - 0.069 (1.346 - 1.752)
0.004 - 0.010 (0.101 - 0.254)
0.050 (1.270) BSC
SO8 1298
LT1355/LT1356
PACKAGE DESCRIPTIO
0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0 - 8 TYP
0.016 - 0.050 (0.406 - 1.270) *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
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.
U
Dimensions in inches (millimeters) unless otherwise noted.
S Package 16-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.386 - 0.394* (9.804 - 10.008) 16 15 14 13 12 11 10 9
0.228 - 0.244 (5.791 - 6.197)
0.150 - 0.157** (3.810 - 3.988)
1 0.053 - 0.069 (1.346 - 1.752)
2
3
4
5
6
7
8
0.004 - 0.010 (0.101 - 0.254)
0.014 - 0.019 (0.355 - 0.483) TYP
0.050 (1.270) BSC
S16 1098
15
LT1355/LT1356
TYPICAL APPLICATIONS
Instrumentation Amplifier
R5 432 R1 20k R2 2k R4 20k
VIN
R4 1 R2 R3 R2 + R3 1 + = 104 + + R3 2 R1 R4 R5 TRIM R5 FOR GAIN TRIM R1 FOR COMMON-MODE REJECTION BW = 120kHz AV =
VIN R1 2.87k R2 26.7k
RELATED PARTS
PART NUMBER LT1354 LT1352/LT1353 LT1358/LT1359 DESCRIPTION 12MHz, 400V/s Op Amp Dual and Quad 250A, 3MHz, 200V/s Op Amps Dual and Quad 25MHz, 600Vs Op Amps COMMENTS Single Version of LT1355/LT1356 Lower Power Version of LT1355/LT1356, VOS = 0.6mV, IS = 250A/Amplifier Faster Version of LT1355/LT1356, VOS = 0.6mV, IS = 2mA/Amplifier
16
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 q FAX: (408) 434-0507 q www.linear-tech.com
U
- +
-
1/2 LT1355
R3 2k
-
1/2 LT1355 VOUT
+
+
1355/1356 TA03
100kHz, 4th Order Butterworth Filter (Sallen-Key)
C4 1000pF
C2 330pF
- -
1/2 LT1355 1/2 LT1355 VOUT
+
R3 2.43k R4 15.4k C3 68pF
1355/1356 TA04
+
C1 100pF
13556fa LT/TP 0400 2K REV A * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1994

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