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LT1352/LT1353 Dual and Quad 250A, 3MHz, 200V/s Operational Amplifiers
FEATURES
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DESCRIPTION
The LT (R)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 1k load to 13V with 15V supplies and a 500 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.
, LTC and LT are registered trademarks of Linear Technology Corporation. C-Load is a trademark of Linear Technology Corporation.
3MHz Gain Bandwidth 200V/s Slew Rate 250A Supply Current per Amplifier C-LoadTM Op Amp Drives All Capacitive Loads Unity-Gain Stable Maximum Input Offset Voltage: 600V 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: 1.25s Minimum Output Swing into 1k: 13V Minimum Output Swing into 500: 3.4V Specified at 2.5V, 5V and 15V
APPLICATIONS
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Battery-Powered Systems Wideband Amplifiers Buffers Active Filters Data Acquisition Systems Photodiode Amplifiers
TYPICAL APPLICATION
Instrumentation Amplifier
R1 50k R2 5k R5 1.1k R3 5k R4 50k
Large-Signal Response
-
1/2 LT1352
-
1/2 LT1352 VOUT
-
VIN
+
+
+
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
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1352/53 TA02
1
LT1352/LT1353
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 1 -IN A 2 +IN A 3 V- 4 B A 6 5 -IN B +IN B 8 7 V+ OUT B
ORDER PART NUMBER LT1352CN8 LT1352CS8 S8 PART MARKING 1352
N8 PACKAGE 8-LEAD PDIP S8 PACKAGE 8-LEAD PLASTIC SO
TJMAX = 150C, JA = 130C/ W (N8) TJMAX = 150C, JA = 190C/ W (S8)
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS
SYMBOL VOS PARAMETER Input Offset Voltage
TA = 25C, VCM = 0V unless otherwise noted.
VSUPPLY 15V 5V 2.5V 2.5V to 15V 2.5V to 15V MIN TYP 0.2 0.2 0.3 5 20 14 0.5 300 600 20 3 12.0 2.5 0.5 13.5 3.5 1.0 - 13.5 - 3.5 - 1.0 80 78 68 90 94 86 77 106 - 12.0 - 2.5 - 0.5 MAX 0.6 0.6 0.8 15 50 UNITS mV mV mV nA nA nV/Hz pA/Hz M M pF V V V V V V dB dB dB dB
CONDITIONS
IOS IB en in RIN CIN
Input Offset Current Input Bias Current Input Noise Voltage Input Noise Current Input Resistance Input Capacitance Positive Input Voltage Range f = 10kHz f = 10kHz VCM = 12V Differential
Negative Input Voltage Range
CMRR
Common Mode Rejection Ratio
VCM = 12V VCM = 2.5V VCM = 0.5V VS = 2.5V to 15V
PSRR
Power Supply Rejection Ratio
2
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TOP VIEW OUT A 1 -IN A 2 +IN A 3 V+ 4 B C A D 14 OUT D 13 -IN D 12 +IN D 11 V - 10 +IN C 9 -IN C 8 OUT C
ORDER PART NUMBER LT1353CS
+IN B 5 -IN B 6 OUT B 7
S PACKAGE 14-LEAD PLASTIC SO
TJMAX = 150C, JA = 150C/ W
2.5V to 15V 2.5V to 15V 15V 15V 15V 15V 5V 2.5V 15V 5V 2.5V 15V 5V 2.5V
LT1352/LT1353
ELECTRICAL CHARACTERISTICS
SYMBOL AVOL PARAMETER Large-Signal Voltage Gain
TA = 25C, VCM = 0V unless otherwise noted.
VSUPPLY 15V 15V 15V 5V 5V 5V 2.5V 15V 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 15V 15V 5V 101 2.0 1.8 MIN 40 30 20 30 25 15 20 13.5 13.4 13.0 3.5 3.4 1.3 13.0 6.8 30 120 30 TYP 80 60 40 60 50 30 40 14.0 13.8 13.4 4.0 3.8 1.7 13.4 7.6 45 200 50 3.2 2.6 3.0 2.7 2.5 46 53 13 16 41 52 700 1250 950 1400 1.5 120 250 230 320 300 MAX UNITS V/mV V/mV V/mV V/mV V/mV V/mV V/mV V 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 dB A A
CONDITIONS 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 RL = 5k, VIN = 10mV RL = 2k, VIN = 10mV RL = 1k, VIN = 10mV RL = 1k, VIN = 10mV RL= 500, VIN = 10mV RL = 5k, VIN = 10mV VOUT = 13V VOUT = 3.4V VOUT = 0V, VIN = 3V AV = - 1, RL = 5k (Note 2) 10V Peak (Note 3) 3V Peak (Note 3) f = 200kHz, RL = 10k
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% to 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 AV = 1, f = 20kHz VOUT = 10V, RL = 2k Each Amplifier Each Amplifier
ts
Settling Time
RO IS
Output Resistance Channel Separation Supply Current
0C TA 70C, VCM = 0V unless otherwise noted.
SYMBOL VOS PARAMETER Input Offset Voltage CONDITIONS VSUPPLY 15V 5V 2.5V (Note 4) 2.5V to 15V 2.5V to 15V 2.5V to 15V 3 MIN TYP MAX 0.8 0.8 1.0 8 20 75 UNITS mV mV mV V/C nA nA
Input VOS Drift IOS IB Input Offset Current Input Bias Current
3
LT1352/LT1353
ELECTRICAL CHARACTERISTICS
SYMBOL CMRR PARAMETER Common Mode Rejection Ratio
0C TA 70C, VCM = 0V unless otherwise noted.
VSUPPLY 15V 5V 2.5V 15V 15V 5V 5V 5V 2.5V 15V 15V 15V 5V 5V 2.5V 15V 5V 15V 15V 5V 15V 5V 15V 15V 5V MIN 78 77 67 89 25 20 20 15 10 15 13.4 13.3 12.0 3.4 3.3 1.2 12.0 6.6 24 100 21 1.8 1.6 100 350 330 TYP MAX UNITS dB dB dB dB V/mV V/mV V/mV V/mV V/mV V/mV V V V V V V mA mA mA V/s V/s MHz MHz dB A A
CONDITIONS VCM = 12V VCM = 2.5V VCM = 0.5V VS = 2.5V to 15V 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 RL = 5k, VIN = 10mV RL = 2k, VIN = 10mV RL = 1k, VIN = 10mV RL = 1k, VIN = 10mV RL= 500, VIN = 10mV RL = 5k, VIN = 10mV VOUT = 12V VOUT = 3.3V VOUT = 0V, VIN = 3V AV = - 1, RL = 5k (Note 2) f = 200kHz, RL = 10k VOUT = 10V, RL = 2k Each Amplifier Each Amplifier
PSRR AVOL
Power Supply Rejection Ratio Large-Signal Voltage Gain
VOUT
Output Swing
IOUT ISC SR GBW
Output Current Short-Circuit Current Slew Rate Gain Bandwidth Channel Separation
IS
Supply Current
- 40C TA 85C, VCM = 0V unless otherwise noted (Note 5).
SYMBOL VOS PARAMETER Input Offset Voltage CONDITIONS VSUPPLY 15V 5V 2.5V (Note 4) 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 = 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 15V 5V 2.5V 76 76 66 87 20 15 15 10 8 10 3 MIN TYP MAX 1.0 1.0 1.2 8 30 100 UNITS mV mV mV V/C nA nA dB dB dB dB V/mV V/mV V/mV V/mV V/mV V/mV
Input VOS Drift IOS IB CMRR Input Offset Current Input Bias Current Common Mode Rejection Ratio
PSRR AVOL
Power Supply Rejection Ratio Large-Signal Voltage Gain
4
LT1352/LT1353
ELECTRICAL CHARACTERISTICS
SYMBOL VOUT PARAMETER Output Swing
- 40C TA 85C, VCM = 0V unless otherwise noted (Note 4).
VSUPPLY 15V 15V 15V 5V 5V 2.5V 15V 5V 15V 15V 5V 15V 5V 15V 15V 5V MIN 13.3 13.2 10.0 3.3 3.2 1.1 10.0 6.4 20 50 15 1.6 1.4 99 380 350 TYP MAX UNITS V V V V V V mA mA mA V/s V/s MHz MHz dB A A
CONDITIONS RL = 5k, VIN = 10mV RL = 2k, VIN = 10mV RL = 1k, VIN = 10mV RL = 1k, VIN = 10mV RL= 500, VIN = 10mV RL = 5k, VIN = 10mV VOUT = 10V VOUT = 3.2V VOUT = 0V, VIN = 3V AV = - 1, RL = 5k (Note 2) f = 200kHz, RL = 10k VOUT = 10V, RL = 2k Each Amplifier Each Amplifier
IOUT ISC SR GBW
Output Current Short-Circuit Current Slew Rate Gain Bandwidth Channel Separation
IS
Supply Current
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 8V on the output with 12V input for 15V supplies and 2V on the output with 3V input for 5V supplies. Note 3: Full-power bandwidth is calculated from the slew rate measurement: FPBW = (Slew Rate)/2VP.
Note 4: This parameter is not 100% tested. Note 5: The LT1352/LT1353 are designed, characterized and expected to meet these extended temperature limits, but are not tested at - 40C and 85C. Guaranteed I grade parts are available, consult factory.
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Supply Voltage and Temperature
350
SUPPLY CURRENT PER AMPLIFIER (A)
COMMON MODE RANGE (V)
INPUT BIAS CURRENT (nA)
300 125C 250 25C
200
- 55C
150
100
0
10 5 15 SUPPLY VOLTAGE ( V)
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1352/53 G01
Input Common Mode Range vs Supply Voltage
V+ - 0.5 -1.0 -1.5 -2.0 TA = 25C VOS = 1mV
20 30
Input Bias Current vs Input Common Mode Voltage
TA = 25C VS = 15V IB = IB+ + IB- 2
10
2.0 1.5 1.0 0.5 V-
0
-10
20
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
5
LT1352/LT1353 TYPICAL PERFORMANCE CHARACTERISTICS
Input Bias Current vs Temperature
40 36
INPUT BIAS CURRENT (nA)
32 28 24 20 16 12 8 4
INPUT VOLTAGE NOISE (nV/Hz)
VS = 15V IB+ + IB- IB = 2
OPEN-LOOP GAIN (dB)
0 -50 -25
50 25 0 75 TEMPERATURE (C)
Open-Loop Gain vs Temperature
100 99
OPEN-LOOP GAIN (dB)
OUTPUT VOLTAGE SWING (V)
OUTPUT VOLTAGE SWING (V)
VS = 15V VO = 12V RL = 5k
98 97 96 95 94 -50 -25
50 25 75 0 TEMPERATURE (C)
Output Short-Circuit Current vs Temperature
60
OUTPUT SHORT-CIRCUIT CURRENT (mA)
VS = 15V
55
6
OUTPUT STEP (V)
OUTPUT STEP (V)
50 SINK 45 40 35 30 25 -50 -25 SOURCE
50 25 75 0 TEMPERATURE (C)
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100
1352/53 G04
Input Noise Spectral Density
100 TA = 25C VS = 15V AV = 101 RS = 100k en 10 in 1 10
INPUT CURRENT NOISE (pA/Hz)
Open-Loop Gain vs Resistive Load
110 TA = 25C 100 VS = 15V VS = 5V 90
80
70
125
1 1 10 1k 100 FREQUENCY (Hz)
0.1 10k
1352/53 G05
60 10 100 1k 10k
1352/53 G06
LOAD RESISTANCE ()
Output Voltage Swing vs Supply Voltage
V+ -1 -2 -3 3 2 1 V- 0 5 15 SUPPLY VOLTAGE (V) 10 20
1352/53 G08
Output Voltage Swing vs Load Current
V+
RL = 2k RL = 1k TA = 25C VIN = 10mV RL = 1k RL = 2k
- 0.5 -1.0 -1.5 -2.0
VS = 5V VIN = 10mV
25C
85C - 40C 25C - 40C 85C
2.0 1.5 1.0 0.5
25C 85C - 40C - 40C 25C 85C 15 20
100
125
V- -20 -15 -10 - 5 0 10 5 OUTPUT CURRENT (mA)
1352/53 G07
1352/53 G09
Settling Time vs Output Step (Noninverting)
10 8 10mV 4 2 0 -2 -4 -6 -8 -10 10mV 1mV VS = 15V AV = 1 OUTPUT FILTER: 1.6MHz LPF 1mV
Settling Time vs Output Step (Inverting)
10 8 6 4 2 0 -2 -4 -6 -8 10mV VS = 15V AV = -1 RG = RF = 2k CF = 5pF RL = 2k 1mV 10mV 1mV
100
125
0.7 0.8 0.9
1 1.1 1.2 1.3 1.4 1.5 1.6 SETTLING TIME (s)
1352/53 G11
-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 (s)
1352/53 G12
1352/53 G10
LT1352/LT1353 TYPICAL PERFORMANCE CHARACTERISTICS
Gain and Phase vs Frequency
70 60 50 PHASE VS = 15V VS = 5V GAIN 20 10 0 -10 1k 10k 100k 1M FREQUENCY (Hz) 10M 20 0 -20 -40 100M
0.01 1k 10k 100k 1M FREQUENCY (Hz) 10M
1352/53 G14
TA = 25C AV = -1 RF = RG = 5k VS = 15V
80 60 40
OUTPUT IMPEDANCE ()
GAIN (dB)
VS = 5V
GAIN (dB)
40 30
Gain Bandwidth and Phase Margin vs Temperature
4.50 4.25 4.00
GAIN BANDWIDTH (MHz)
VS = 15V VS = 5V PHASE MARGIN
3.75 3.50 3.25 3.00 2.75 2.50 2.25 2.00 -50 -25
GAIN (dB)
GAIN BANDWIDTH VS = 15V VS = 5V
40 38 36 34 32
0 -1 -2 -3 -4 -5 10k 100k 1M FREQUENCY (Hz) 10M
1352/53 G17
GAIN (dB)
50 25 0 75 TEMPERATURE (C)
Gain Bandwidth and Phase Margin vs Supply Voltage
4.50 4.25 4.00 TA = 25C PHASE MARGIN 50
POWER SUPPLY REJECTION RATIO (dB)
48 46
100 80
COMMON MODE REJECTION RATIO (dB)
GAIN BANDWIDTH (MHz)
3.75 3.50 3.25 3.00 2.75 2.50 2.25 2.00 0
GAIN BANDWIDTH
15 10 5 SUPPLY VOLTAGE ( V)
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1352/53 G13
Output Impedance vs Frequency
120 100
100 AV = 100 AV = 10 10 AV = 1 1000 TA = 25C VS = 15V 10 8 6 4 2 0 -2 -4 0.1 -6 -8
Frequency Response vs Capacitive Load
TA = 25C VS = 15V AV = -1 RFB = RG = 5k
C = 5000pF C = 1000pF
C = 500pF C = 100pF
PHASE (DEG)
PHASE MARGIN (DEG)
1
C = 10pF
-10 10k
100k 1M FREQUENCY (Hz)
10M
1352/53 G15
Frequency Response vs Supply Voltage (AV = 1)
50 48 46 44 42
Frequency Response vs Supply Voltage (AV = - 1)
5 4 3 2 1 0 -1 -2 -3 -4 -5 10k 15V 5V 2.5V 100k 1M FREQUENCY (Hz) 10M
1352/53 G18
5 4 3 2 1 TA = 25C AV = 1 RL = 5k
TA = 25C AV = -1 RF = RG = 5k
15V 5V 2.5V
100
30 125
1352/53 G16
Power Supply Rejection Ratio vs Frequency
120 TA = 25C VS = 15V 120 100 80 60 40 20
Common Mode Rejection Ratio vs Frequency
TA = 25C VS = 15V
PHASE MARGIN (DEG)
44 42 40 38 36 34 32 30 20
1352/53 G19
- PSRR = +PSRR 60 40 20 0
10
100
1k 10k 100k FREQUENCY (Hz)
1M
10M
0 100
1k
10k 100k FREQUENCY (Hz)
1M
10M
1352/53 G20
1352/53 G21
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LT1352/LT1353 TYPICAL PERFORMANCE CHARACTERISTICS
Slew Rate vs Supply Voltage
200
250
150
SLEW RATE (V/s)
TA = 25C AV = -1 RF = RG = 5k SR = (SR+ + SR - )/2
SLEW RATE (V/s)
SLEW RATE (V/s)
100
50
50
0 0 5 10 SUPPLY VOLTAGE (V) 15
1352/53 G22
Total Harmonic Distortion vs Frequency
1
TOTAL HARMONIC DISTORTION (%)
OUTPUT VOLTAGE (VP-P)
OUTPUT VOLTAGE (VP-P)
TA = 25C VS = 15V RL = 5k VO = 2VP-P 0.1
0.01 AV = -1
0.001 10
AV = 1 100 1k 10k FREQUENCY (Hz) 100k
1352/53 G25
2nd and 3rd Harmonic Distortion vs Frequency
- 30 - 40 - 50 3RD HARMONIC - 60 -70 2ND HARMONIC - 80 VS = 15V AV = 1 RL = 5k VO = 2VP-P
HARMONIC DISTORTION (dB)
CROSSTALK (dB)
OVERSHOOT (%)
- 90 100k FREQUENCY (Hz)
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1352/53 G28
Slew Rate vs Temperature
AV = -1 RF = RG = RL = 5k SR = (SR+ + SR - )/2 VS = 15V 150
Slew Rate vs Input Level
200 175 150 125 100 75 50 25 TA = 25C VS = 15V AV = -1 RFB = RG = 5k SR = (SR+ + SR -)/2
200
100 VS = 5V
0 -50 -25
50 0 75 25 TEMPERATURE (C)
100
125
0
0
4
8 16 12 INPUT LEVEL (VP-P)
20
24
1352/53 G23
1352/53 G24
Undistorted Output Swing vs Frequency (15V)
30 AV = -1 25 AV = 1 20 15 10 5 VS = 15V RL = 5k THD = 1% 100k FREQUENCY (Hz) 1M
1352/53 G26
Undistorted Output Swing vs Frequency (5V)
10 9 8 7 6 5 4 3 2 1 VS = 5V RL = 5k THD = 1% 100k FREQUENCY (Hz) 1M
1352/53 G27
AV = 1 AV = -1
0 10k
0 10k
Crosstalk vs Frequency
- 40 - 50 - 60 -70 - 80 - 90 TA = 25C AV = 1 RL = 1k VIN = 15dBm
100 90 80 70 60 50 40 30 20 10
Capacitive Load Handling
TA = 25C VS = 15V RL = 5k AV = 1
AV = -1
-100 -110
1M
-120 100
1k
10k 100k FREQUENCY (Hz)
1M
10M
1352/53 G29
0 10p
100p
1n 10n 0.1 CAPACITIVE LOAD (F)
1
1352/53 G30
LT1352/LT1353 TYPICAL PERFORMANCE CHARACTERISTICS
Small-Signal Transient (AV = 1) Small-Signal Transient (AV = - 1) Small-Signal Transient (AV = - 1, CL = 1000pF)
Large-Signal Transient (AV = 1)
APPLICATIONS INFORMATION
Layout and Passive Components 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 (0.01F 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 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. 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 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 NPN to PNP beta matching and is well controlled. The use of balanced source resistance at each input is recom-
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1352/53 G31 1352/53 G34
1352/53 G32
1352/53 G33
Large-Signal Transient (AV = - 1)
Large-Signal Transient (AV = 1, CL = 10,000pF)
1352/53 G35
1352/53 G36
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LT1352/LT1353
APPLICATIONS INFORMATION
mended 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. Differential inputs generate large supply currents (up to 40mA) as required for high slew rates. Typically power dissipation does not significantly increase because of the low duty cycle of the transient inputs. If the device is used as a comparator with sustained differential inputs, excessive power dissipation may result. 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 150C under certain conditions. Maximum junction temperature TJ is calculated from the ambient temperature TA and power dissipation PD as follows: LT1352CN8: TJ = TA + (PD)(130C/W) LT1352CS8: TJ = TA + (PD)(190C/W) LT1353CS: TJ = TA + (PD)(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 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 85C, VS = 15V, RL = 500, VOUT = 5V (10mA) PD(MAX) = (30V)(380A) + (15V - 5V)(10mA) = 111mW TJ = 85C + (4)(111mW)(150C/W) = 152C
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LT1352/LT1353
SI PLIFIED SCHE ATIC
V+ R2 Q10 Q11 Q12 Q20 R3 Q21
-IN
Q5
Q6 Q8 Q4
V-
TYPICAL APPLICATIONS
DAC I-to-V Converter
10pF DAC INPUTS 12 10k 5k
565A TYPE V VOS + IOS (5k) + OUT < 0.5LSB AVOL 5k
1352/53 TA03
1/2 LT1352 10nF
20kHz, 4th Order Butterworth Filter
4.64k 470pF 5.49k 220pF 4.64k VIN 2200pF 13.3k
-
1/2 LT1352
5.49k
11.3k
-
1/2 LT1352 VOUT
+
4700pF
+
1352/53 TA04
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
W
W
C1 R6
Q9 Q7 R1 Q3 1k Q2 Q17 Q1 +IN Q18 R7 Q13 CT Q15 RC CC
Q19
OUTPUT
Q22 C2
Q14
Q16
Q23 R4
Q24 R5
1352/53 SS
400kHz Photodiode Preamp with 10kHz Highpass Loop
1N5712
-
1/2 LT1352 VOUT BPV22NF 1.5k
-
1/2 LT1352 VOUT 10k
+
+
10nF
10k
1352/53 TA05
11
LT1352/LT1353
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
N8 Package 8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.300 - 0.325 (7.620 - 8.255) 0.045 - 0.065 (1.143 - 1.651) 0.130 0.005 (3.302 0.127) 0.400* (10.160) MAX 8 7 6 5
0.009 - 0.015 (0.229 - 0.381)
0.065 (1.651) TYP 0.005 (0.127) MIN 0.100 0.010 (2.540 0.254) 0.125 (3.175) MIN 0.018 0.003 (0.457 0.076) 0.015 (0.380) MIN
(
+0.025 0.325 -0.015 +0.635 8.255 -0.381
)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
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
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)
*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
RELATED PARTS
PART NUMBER LT1351 LT1354/55/56 DESCRIPTION 250A, 3MHz, 200V/s Op Amp Single/Dual/Quad 1mA, 12MHz, 400V/s Op Amp COMMENTS Good DC Precision, C-Load Stable, Power Saving Shutdown Good DC Precision, Stable with All Capacitive Loads
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507 q TELEX: 499-3977
U
0.255 0.015* (6.477 0.381)
1
2
3
4
S8 Package 8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.189 - 0.197* (4.801 - 5.004) 0.053 - 0.069 (1.346 - 1.752) 8 0.004 - 0.010 (0.101 - 0.254) 0.228 - 0.244 (5.791 - 6.197) 0.150 - 0.157** (3.810 - 3.988) 7 6 5
0.014 - 0.019 (0.355 - 0.483)
0.050 (1.270) BSC
1
2
3
4
S Package 14-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.337 - 0.344* (8.560 - 8.738) 0.004 - 0.010 (0.101 - 0.254) 14 13 12 11 10 9 8
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
LT/GP 0796 7K * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1996

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