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LT1358/LT1359 Dual and Quad 25MHz, 600V/s Op Amps
FEATURES
s s s s s s s s s s s s s s s
DESCRIPTION
The LT1358/LT1359 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 LT1358/LT1359 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 LT1358/LT1359 see the LT1357 data sheet. For higher bandwidth devices with higher supply currents see the LT1360 through LT1365 data sheets. For lower supply current amplifiers see the LT1354 and LT1355/ LT1356 data sheets. Singles, duals, and quads of each amplifier are available.
C-Load is a trademark of Linear Technology Corporation
25MHz Gain-Bandwidth 600V/s Slew Rate 2.5mA Maximum Supply Current per Amplifier Unity Gain Stable C-LoadTM Op Amp Drives All Capacitive Loads 8nV/Hz Input Noise Voltage 600V Maximum Input Offset Voltage 500nA Maximum Input Bias Current 120nA Maximum Input Offset Current 20V/mV Minimum DC Gain, RL=1k 115ns Settling Time to 0.1%, 10V Step 220ns 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
APPLICATIONS
s s s s s
Wideband Amplifiers Buffers Active Filters Data Acquisition Systems Photodiode Amplifiers
TYPICAL APPLICATION
DAC I-to-V Converter AV = -1 Large-Signal Response
6pF DAC INPUTS 12 5k
-
565A-TYPE
+
0.1F 5k
1/2 LT1358
VOUT
V V OS + IOS 5k + OUT < 1LSB A VOL
1358/1359 TA01
()
U
U
U
1358/1359 TA02
1
LT1358/LT1359
ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage (V+ to V -) ............................... 36V Differential Input Voltage ....................................... 10V Input Voltage ............................................................VS Output Short-Circuit Duration (Note 1) ............ Indefinite Operating Temperature Range ................ -40C to 85C Specified Temperature Range ................. -40C to 85C Maximum Junction Temperature (See Below) Plastic Package ................................................ 150C Storage Temperature Range ................. -65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
PACKAGE/ORDER INFORMATION
TOP VIEW OUT A -IN A +IN A V- 1 2 A 3 4 B 6 5 -IN B +IN B 8 7 V
+
ORDER PART NUMBER LT1358CN8
OUT B
N8 PACKAGE 8-LEAD PLASTIC DIP TJMAX = 150C, JA = 130C/ W
TOP VIEW
OUT A
ORDER PART NUMBER
14 OUT D 13 -IN D
1 2 3 4 5 6 7 B C A D
-IN A +IN A V+ +IN B -IN B
OUT B
LT1359CN
12 +IN D 11 V - 10 +IN C 9 8
-IN C
OUT C
N PACKAGE 14-LEAD PLASTIC DIP
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.
V SUPPLY 15V 5V 2.5V 2.5V to 15V 2.5V to 15V MIN TYP 0.2 0.2 0.3 40 120 8 0.8 35 80 6 3 MAX 0.6 0.6 0.8 120 500 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
TOP VIEW OUT A -IN A +IN A V- 1 2 A 3 4 B 6 5 -IN B +IN B 8 7 V+ OUT B
ORDER PART NUMBER LT1358CS8 S8 PART MARKING 1358 ORDER PART NUMBER LT1359CS
S8 PACKAGE 8-LEAD PLASTIC SOIC 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 SOIC TJMAX = 150C, JA = 150C/ W
2.5V to 15V 2.5V to 15V 15V 15V 15V
LT1358/LT1359
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER Input Voltage Range + CONDITIONS
TA = 25C, VCM = 0V unless otherwise noted.
V SUPPLY 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 -3.3 -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 18 15 20 7 20 7 1.5 7 13.3 12.5 3.5 3.0 1.3 25 20 30 300 150 97 84 75 106 65 25 45 25 6 30 13.8 13.0 4.0 3.3 1.7 30 25 42 600 220 9.6 11.7 25 22 20 8 9 27 27 9 11 115 220 110 380 0.1 0.1 0.50 0.35 0.3 113 2.0 1.9 2.5 2.4 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
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 2) 10V Peak, (Note 3) 3V Peak, (Note 3) 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
LT1358/LT1359
ELECTRICAL CHARACTERISTICS
SYMBOL VOS PARAMETER Input Offset Voltage CONDITIONS
0C TA 70C, VCM = 0V unless otherwise noted.
V SUPPLY 15V 5V 2.5V 2.5V to 15V 2.5V to 15V 2.5V to 15V MIN
q q q q q q q q q q
TYP
MAX 0.8 0.8 1.0 8 180 750
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 4)
5
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 = 12.2V VOUT = 2.8V VOUT = 0V, VIN = 3V AV = - 2, (Note 2) 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 15 5 15 5 1 5 13.2 12.2 3.4 2.8 1.2 24.4 18.7 25 225 125 15 12 98 2.9 2.8
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
ELECTRICAL CHARACTERISTICS
SYMBOL VOS PARAMETER Input Offset Voltage CONDITIONS
-40C TA 85C, VCM = 0V unless otherwise noted. (Note 5)
V SUPPLY 15V 5V 2.5V
q q q q q q q q q q
MIN
TYP
MAX 1.3 1.3 1.5
UNITS mV mV mV V/C nA nA dB dB dB dB
Input VOS Drift IOS IB CMRR Input Offset Current Input Bias Current Common-Mode Rejection Ratio
(Note 4)
2.5V to 15V 2.5V to 15V 2.5V to 15V
5
8 300 900
VCM = 12V VCM = 2.5V VCM = 0.5V VS = 2.5V to 15V
15V 5V 2.5V
80 76 66 90
PSRR
Power Supply Rejection Ratio
4
LT1358/LT1359
ELECTRICAL CHARACTERISTICS
SYMBOL AVOL PARAMETER Large-Signal Voltage Gain
-40C TA 85C, VCM = 0V unless otherwise noted. (Note 5)
V SUPPLY 15V 15V 5V 5V 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 q q q q
CONDITIONS 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 = 2.6V VOUT = 0V, VIN = 3V AV = - 2, (Note 2) f = 200kHz, RL = 2k VOUT = 10V, RL = 500 Each Amplifier Each Amplifier
MIN 10.0 2.5 10.0 2.5 0.6 2.5 13.0 12.0 3.4 2.6 1.2 24.0 17.3 24 180 100 14 11 98
TYP
MAX
UNITS 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
VOUT
Output Swing
IOUT ISC SR GBW
Output Current Short-Circuit Current Slew Rate Gain-Bandwidth Channel Separation
IS
Supply Current
3.0 2.9
mA mA
The q denotes specifications that apply over the full operating temperature range. Note 1: A heat sink may be required to keep the junction temperature below absolute maximum when the output is shorted indefinitely. Note 2: 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 3: Full power bandwidth is calculated from the slew rate measurement: FPBW = (SR)/2VP. Note 4: This parameter is not 100% tested. Note 5: The LT1358/LT1359 are not tested and are not quality-assurance sampled at - 40C and at 85C. These specifications are guaranteed by design, correlation, and/or inference from 0C, 25C, and/or 70C tests.
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Supply Voltage and Temperature
3.0
V+ -0.5
COMMON-MODE RANGE (V)
125C 2.0 25C -55C 1.5
-1.5 -2.0
INPUT BIAS CURRENT (nA)
2.5
SUPPLY CURRENT (mA)
1.0
0.5
0
5 10 15 SUPPLY VOLTAGE (V)
UW
20
1358/1359 G01
Input Common-Mode Range vs Supply Voltage
400
Input Bias Current vs Input Common-Mode Voltage
VS = 15V TA = 25C IB+ + IB- IB = -------- 2
TA = 25C VOS < 1mV
-1.0
300 200 100 0
2.0 1.5 1.0 0.5 V- 0 5 10 15 SUPPLY VOLTAGE (V) 20
1358/1359 G02
-100 -200 -15
-10 -5 0 5 10 INPUT COMMON-MODE VOLTAGE (V)
15
1358/1359 G03
5
LT1358/LT1359 TYPICAL PERFORMANCE CHARACTERISTICS
Input Bias Current vs Temperature
450 400
INPUT BIAS CURRENT (nA)
INPUT VOLTAGE NOISE (nV/Hz)
350 300 250 200 150 100 50 0 -50
VS = 15V IB+ + IB- IB = -------- 2
OPEN-LOOP GAIN (dB)
-25
0 25 50 75 TEMPERATURE (C)
Open-Loop Gain vs Temperature
101 100 VS = 15V RL = 1k VO = 12V
V+ -1
OUTPUT VOLTAGE SWING (V)
OPEN-LOOP GAIN (dB)
99 98 97 96 95 94 93 - 50 -25 0 25 50 75 TEMPERATURE (C) 100 125
OUTPUT VOLTAGE SWING (V)
Output Short-Circuit Current vs Temperature
65
OUTPUT SHORT-CIRCUIT CURRENT (mA)
VS = 5V
60
OUTPUT SWING (V)
50 45 SINK 40 SOURCE 35 30 25 - 50 -25 0 25 50 75 TEMPERATURE (C) 100 125
2 0 -2 -4 -6 -8 -10 50 10mV 100 150 200 SETTLING TIME (ns) 250
1358/1359 G11
OUTPUT SWING (V)
55
6
UW
100
1358/1359 G04
1358/1359 G07 1358/1359 G10
Input Noise Spectral Density
100 VS = 15V TA = 25C AV = 101 RS = 100k en 10 in 1 10
INPUT CURRENT NOISE (pA/Hz)
Open-Loop Gain vs Resistive Load
100 TA = 25C 90 VS = 15V VS = 5V
80
70
60
1 125 10 100 1k 10k FREQUENCY (Hz)
0.1 100k
1358/1359 G05
50 10 1k 100 LOAD RESISTANCE () 10k
1358/1359 G06
Output Voltage Swing vs Supply Voltage
V + -0.5
TA = 25C RL = 1k RL = 500
Output Voltage Swing vs Load Current
-1.0 -1.5 -2.0 -2.5 25C 2.5 2.0 -40C 1.5 25C VS = 5V VIN = 100mV -40C 85C
-2 -3 3 2 1 V
-
RL = 500
85C
RL = 1k 0 5 10 15 SUPPLY VOLTAGE (V) 20
1358/1359 G08
1.0 - +0.5 V -50 -40 -30 -20 -10 0 10 20 30 40 50 OUTPUT CURRENT (mA)
1358/1359 G09
Settling Time vs Output Step (Noninverting)
10 8 6 4 1mV 10mV VS = 15V AV = 1
Settling Time vs Output Step (Inverting)
10 8 6 4 2 0 -2 -4 -6 -8 -10 50 100 150 200 SETTLING TIME (ns) 250
1358/1359 G12
10mV 1mV
VS = 15V AV = -1 10mV 1mV
1mV
LT1358/LT1359 TYPICAL PERFORMANCE CHARACTERISTICS
Output Impedance vs Frequency
1k VS = 15V TA = 25C AV = 100 AV = 10 10 AV = 1 1
VOLTAGE MAGNITUDE (dB)
OUTPUT IMPEDANCE ()
100
GAIN-BANDWIDTH (MHz)
0.1
0.01 10k
100k
1M 10M FREQUENCY (Hz)
Gain-Bandwidth and Phase Margin vs Temperature
38 36 PHASE MARGIN VS = 15V PHASE MARGIN VS = 5V 50 48 46
GAIN-BANDWIDTH (MHz)
34 32 30 28 26 24 22 20 GAIN-BANDWIDTH VS = 5V -25 0 25 50 75 TEMPERATURE (C) 100 GAIN-BANDWIDTH VS = 15V
GAIN (dB)
40 38 36 34 32 30 125
0 -1 -2 -3 -4 -5 100k 2.5V 10M 1M FREQUENCY (Hz) 100M
1358/1359 G17
GAIN (dB)
18 - 50
Gain and Phase vs Frequency
70 60 50
GAIN (dB)
POWER SUPPLY REJECTION RATIO (dB)
PHASE VS = 15V VS = 15V GAIN VS = 5V VS = 5V
100 80 60 40 20 0
PHASE (DEG)
- PSRR 80
COMMON-MODE REJECTION RATIO (dB)
40 30 20 10 0 -10 10k
TA = 25C AV = -1 RF = RG = 2k 100k 1M 10M FREQUENCY (Hz) 100M
1358/1359 G14
UW
1358/1359 G13
1358/1359 G16
Frequency Response vs Capacitive Load
10 8 6 4 2 0 -2 -4 -6 -8 100M -10 100k 1M 10M FREQUENCY (Hz) 100M
1358/1359 G19
Gain-Bandwidth and Phase Margin vs Supply Voltage
38 50 TA = 25C PHASE MARGIN 48 46
PHASE MARGIN (DEG)
VS = 15V TA = 25C AV = -1
C = 1000pF C = 500pF C = 100pF C = 50pF
36 34 32 30 28 26 24 22 20 18 0
44 42 40 38 36
C=0
GAIN-BANDWIDTH
34 32 30
5 10 15 SUPPLY VOLTAGE (V)
20
1358/1359 G15
Frequency Response vs Supply Voltage (AV = 1)
5 4 3
PHASE MARGIN (DEG)
Frequency Response vs Supply Voltage (AV = -1)
5 4 TA = 25C AV = -1 RF = RG = 2k
TA = 25C AV = 1 RL = 2k
44 42
2 1
15V
3 2 1 0 -1 -2 -3 -4 -5 100k
5V
5V 2.5V
15V
10M 1M FREQUENCY (Hz)
100M
1358/1359 G18
Power Supply Rejection Ratio vs Frequency
120 100 +PSRR 120 VS = 15V TA = 25C 100 80 60 40 20 0
Common-Mode Rejection Ratio vs Frequency
VS = 15V TA = 25C
60
40
20
0 100
1k
10k 100k 1M FREQUENCY (Hz)
10M
100M
1k
10k
100k 1M FREQUENCY (Hz)
10M
100M
1358/1359 G20
1358/1359 G21
7
LT1358/LT1359 TYPICAL PERFORMANCE CHARACTERISTICS
Slew Rate vs Supply Voltage
1000 TA = 25C AV = -1 RF = RG = 2k SR+ + SR- SR = ---------- 2 600 500
SLEW RATE (V/s)
800
SLEW RATE (V/s)
400 300 200
600
SLEW RATE (V/s)
400
200
0 0 5 10 SUPPLY VOLTAGE (V) 15
1358/1359 G22
Total Harmonic Distortion vs Frequency
0.01
TOTAL HARMONIC DISTORTION (%)
30
OUTPUT VOLTAGE (VP-P)
AV = 1 20 15 10 5 VS = 15V RL = 2k AV = 1, 1% MAX DISTORTION AV = -1, 2% MAX DISTORTION 1M FREQUENCY (Hz) 10M
1358/1359 G26
OUTPUT VOLTAGE (VP-P)
TA = 25C VO = 3VRMS RL = 2k
AV = -1 0.001 AV = 1
0.0001 10
100
1k 10k FREQUENCY (Hz)
2nd and 3rd Harmonic Distortion vs Frequency
-30 -40 -50 -60 -70 2ND HARMONIC -80 -90 100k 200k VS = 15V VO = 2VP-P RL = 2k AV = 2 3RD HARMONIC
CROSSTALK (dB)
HARMONIC DISTORTION (dB)
OVERSHOOT (%)
400k 1M 2M FREQUENCY (Hz)
8
UW
1358/1359 G25
Slew Rate vs Temperature
1000 VS = 15V AV = -2 SR+ + SR- SR = ---------- 2 900 800 700 600 500 400 300 200 100 0 -50 0 -25 0 25 50 75 TEMPERATURE (C) 100 125
Slew Rate vs Input Level
TA = 25C VS = 15V AV = -1 RF = RG = 2k SR+ + SR - SR = ---------- 2
VS = 5V 100
0
2
4
6 8 10 12 14 16 18 20 INPUT LEVEL (VP-P)
1358/1359 G24
1358/1359 G23
Undistorted Output Swing vs Frequency (15V)
10 AV = -1 25 8
Undistorted Output Swing vs Frequency (5V)
AV = -1 AV = 1
6
4
2
VS = 5V RL = 2k 2% MAX DISTORTION 1M FREQUENCY (Hz) 10M
1358/1359 G27
100k
0 100k
0 100k
Crosstalk vs Frequency
-40 -50 -60 -70 -80 -90 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
1358/1359 G29
0 10p
100p
1000p 0.01 0.1 CAPACITIVE LOAD (F)
1
1358/1359 G28
1358/1359 G30
LT1358/LT1359 TYPICAL PERFORMANCE CHARACTERISTICS
Small-Signal Transient (AV = 1) Small-Signal Transient (AV = -1) Small-Signal Transient (AV = -1, CL = 1000pF)
1358/1359 G31
Large-Signal Transient (AV = 1)
1358/1359 G34
APPLICATIONS INFORMATION
Layout and Passive Components The LT1358/LT1359 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. Capacitive Loading The LT1358/LT1359 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.
U
W
UW
1358/1359 G32
1358/1359 G33
Large-Signal Transient (AV = -1)
Large-Signal Transient (AV = 1, CL = 10,000pF)
1358/1359 G35
1358/1359 G36
U
U
9
LT1358/LT1359
APPLICATIONS INFORMATION
Input Considerations Each of the LT1358/LT1359 amplifier inputs is the base of an NPN and 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 current can be positive or negative. The offset current does not depend on 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 differential input voltages of up to 10V without damage and need no clamping or source resistance for protection. Circuit Operation The LT1358/LT1359 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 500 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 LT1358/LT1359 are tested for slew rate in a gain of -2 so higher slew rates can be expected in gains of 1 and -1, and lower slew rates in higher gain configurations. The RC network across the output stage is bootstrapped when the amplifier is driving a light or moderate load and has no effect under normal operation. When driving a capacitive load (or a low value resistive load) the network is incompletely bootstrapped and adds to the compensation at the high impedance node. The added capacitance slows down the amplifier which improves the phase margin by moving the unity-gain frequency away from the pole formed by the output impedance and the capacitive load. The zero created by the RC combination adds phase to ensure that even for very large load capacitances, the total phase lag can never exceed 180 degrees (zero phase margin) and the amplifier remains stable. Power Dissipation The LT1358/LT1359 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: LT1358CN8: LT1358CS8: LT1359CN: LT1359CS: TJ = TA + (PD x 130C/W) TJ = TA + (PD x 190C/W) TJ = TA + (PD x 110C/W) TJ = TA + (PD x 150C/W)
10
U
W
U
U
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: LT1358 in S8 at 70C, VS = 15V, RL = 500 PDMAX = (30V)(2.9mA) + (7.5V)2/500 = 200mW TJMAX = 70C + (2 x 200mW)(190C/W) = 146C
LT1358/LT1359
TYPICAL APPLICATIONS
Instrumentation Amplifier
R5 432 R1 20k R2 2k R4 20k
VIN
3.4k VIN
SI PLIFIED SCHE ATIC
V+
-IN C CC
V-
1358/1359 SS01
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
-
1/2 LT1358
R3 2k
-
1/2 LT1358 VOUT
- +
+
+
R4 1 R2 R3 R2 + R3 1 + = 104 + + R3 2 R1 R4 R5 TRIM R5 FOR GAIN TRIM R1 FOR COMMON-MODE REJECTION BW = 250kHz AV =
1358/1359 TA03
200kHz, 4th Order Butterworth Filter
3.4k 100pF 47pF 5.62k 330pF 2.61k
-
1/2 LT1358
2.61k
5.11k 1000pF
-
1/2 LT1358 VOUT
+
+
1358/1359 TA04
W
W
R1 500
+IN
RC OUT
11
LT1358/LT1359
PACKAGE DESCRIPTION
0.300 - 0.320 (7.620 - 8.128)
0.009 - 0.015 (0.229 - 0.381)
(
+0.025 0.325 -0.015 +0.635 8.255 -0.381
)
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
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).
0.300 - 0.325 (7.620 - 8.255)
0.130 0.005 (3.302 0.127) 0.015 (0.380) MIN
0.009 - 0.015 (0.229 - 0.381) +0.025 0.325 -0.015 +0.635 8.255 -0.381
(
)
0.125 (3.175) MIN
0.010 - 0.020 x 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)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900 q FAX: (408) 434-0507 q TELEX: 499-3977
U
Dimension in inches (millimeters) unless otherwise noted. N8 Package 8-Lead Plastic DIP
0.045 - 0.065 (1.143 - 1.651) 0.130 0.005 (3.302 0.127) 0.400 (10.160) MAX 8 7 6 5
0.065 (1.651) TYP 0.125 (3.175) MIN 0.020 (0.508) MIN 1 2 3
0.250 0.010 (6.350 0.254)
0.045 0.015 (1.143 0.381) 0.100 0.010 (2.540 0.254)
0.018 0.003 (0.457 0.076)
4
N8 0392
S8 Package 8-Lead Plastic SOIC
0.053 - 0.069 (1.346 - 1.752) 0.004 - 0.010 (0.101 - 0.254) 8
0.189 - 0.197 (4.801 - 5.004) 7 6 5
0.014 - 0.019 (0.355 - 0.483)
0.050 (1.270) BSC
0.228 - 0.244 (5.791 - 6.197)
0.150 - 0.157 (3.810 - 3.988)
1
2
3
4
SO8 0294
N Package 14-Lead Plastic DIP
0.045 - 0.065 (1.143 - 1.651) 0.770 (19.558) MAX 14 0.065 (1.651) TYP 0.075 0.015 (1.905 0.381) 0.100 0.010 (2.540 0.254) 0.018 0.003 (0.457 0.076) 13 12 11 10 9 8
0.260 0.010 (6.604 0.254)
1
2
3
4
5
6
7
N14 0392
S Package 16-Lead Plastic SOIC
0.386 - 0.394* (9.804 - 10.008) 0.004 - 0.010 (0.101 - 0.254) 16 15 14 13 12 11 10 9
0.050 (1.270) TYP
0.228 - 0.244 (5.791 - 6.197)
0.150 - 0.157* (3.810 - 3.988)
1
2
3
4
5
6
7
8
LT/GP 0494 10K * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1994

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