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LT1224 Very High Speed Operational Amplifier
FEATURES
s s s s s s s s s s
DESCRIPTIO
Unity-Gain Stable 45MHz Gain-Bandwidth 400V/s Slew Rate 7V/mV DC Gain: RL = 500 Maximum Input Offset Voltage: 2mV 12V Minimum Output Swing into 500 Wide Supply Range: 2.5V to 15V 7mA Supply Current 90ns Settling Time to 0.1%, 10V Step Drives All Capacitive Loads
The LT1224 is a very high speed operational amplifier with excellent DC performance. The LT1224 features reduced input offset voltage and higher DC gain than devices with comparable bandwidth and slew rate. The circuit is a single gain stage with outstanding settling characteristics. The fast settling time makes the circuit an ideal choice for data acquisition systems. The output is capable of driving a 500 load to 12V with 15V supplies and a 150 load to 3V on 5V supplies. The circuit is also capable of driving large capacitive loads which makes it useful in buffer or cable driver applications. The LT1224 is a member of a family of fast, high performance amplifiers that employ Linear Technology Corporation's advanced bipolar complementary processing.
APPLICATI
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Wideband Amplifiers Buffers Active Filters Video and RF Amplification Cable Drivers Data Acquisition Systems
TYPICAL APPLICATI
DAC Current-to-Voltage Converter
7pF
Inverter Pulse Response
5k
DAC-08 TYPE
-
LT1224 VOUT
+
0.1F 5k 1 LSB SETTLING = 140ns
LT1224 * TA01
LT1224 * TA02
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LT1224 ABSOLUTE AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW NULL -IN +IN V- 1 2 3 4 8 7 6 5 NULL V+ OUT NC
Total Supply Voltage (V+ to V-) ............................... 36V Differential Input Voltage ......................................... 6V Input Voltage ............................................................VS Output Short Circuit Duration (Note 1) ............ Indefinite Operating Temperature Range LT1224C ................................................ 0C to 70C Maximum Junction Temperature Plastic Package .............................................. 150C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec.)................. 300C
ORDER PART NUMBER LT1224CN8 LT1224CS8 S8 PART MARKING 1224
N8 PACKAGE 8-LEAD PLASTIC DIP
S8 PACKAGE 8-LEAD PLASTIC SOIC
LT1224 * POI01
TJMAX = 150C, JA = 100C/W (N8) TJMAX = 150C, JA = 150C/W (S8)
ELECTRICAL CHARACTERISTICS
SYMBOL VOS IOS IB en in RIN CIN PARAMETER Input Offset Voltage Input Offset Current Input Bias Current Input Noise Voltage Input Noise Current Input Resistance Input Capacitance Input Voltage Range + Input Voltage Range - CMRR PSRR AVOL VOUT IOUT SR GBW tr, tf Common-Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Output Swing Output Current Slew Rate Full Power Bandwidth Gain-Bandwidth Rise Time, Fall Time Overshoot Propagation Delay ts Settling Time Differential Gain Differential Phase RO IS Output Resistance Supply Current
VS = 15V, TA = 25C, RL = 1k, VCM = 0V unless otherwise noted.
MIN TYP 0.5 100 4 MAX 2.0 400 8 UNITS mV nA A nV/Hz pA/Hz M k pF V - 12 V dB dB V/mV V mA V/s MHz MHz ns % ns ns % Deg 9 mA
CONDITIONS (Note 2)
f = 10kHz f = 10kHz VCM = 12V Differential 24
22 1.5 40 250 2 12 14 - 13 100 84 7 13.3 40 400 6.4 45 5 30 5 90 1 2.4 2.5 7
VCM = 12V VS = 5V to 15V VOUT = 10V, RL = 500 RL = 500 VOUT = 12V AVCL = -2, (Note 3) 10V Peak, (Note 4) f = 1MHz AVCL = 1, 10% to 90%, 0.1V AVCL = 1, 0.1V 50% VIN to 50% VOUT 10V Step, 0.1% f = 3.58MHz, RL = 150 f = 3.58MHz, RL = 150 AVCL = 1, f = 1MHz
86 75 3.3 12.0 24 250
2
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LT1224
ELECTRICAL CHARACTERISTICS VS = 5V, TA = 25C, RL = 1k, VCM = 0V unless otherwise noted.
SYMBOL VOS IOS IB PARAMETER Input Offset Voltage Input Offset Current Input Bias Current Input Voltage Range + Input Voltage Range - CMRR AVOL VOUT IOUT SR GBW tr, tf Common-Mode Rejection Ratio Large-Signal Voltage Gain Output Swing Output Current Slew Rate Full Power Bandwidth Gain-Bandwidth Rise Time, Fall Time Overshoot Propagation Delay ts IS Settling Time Supply Current VCM = 2.5V VOUT = 2.5V, RL = 500 VOUT = 2.5V, RL = 150 RL = 500 RL = 150 VOUT = 3V AVCL = -2, (Note 3) 3V Peak, (Note 4) f = 1MHz AVCL = 1, 10% to 90%, 0.1V AVCL = 1, 0.1V 50% VIN to 50% VOUT -2.5V to 2.5V, 0.1% 86 2.5 3.0 3.0 20 2.5 CONDITIONS (Note 2) MIN TYP 1 100 4 4 -3 98 7 3 3.7 3.3 40 250 13.3 34 7 20 7 90 7 9 - 2.5 MAX 4 400 8 UNITS mV nA A V V dB V/mV V/mV V V mA V/s MHz MHz ns % ns ns mA
ELECTRICAL CHARACTERISTICS
SYMBOL VOS PARAMETER Input Offset Voltage Input VOS Drift IOS IB CMRR PSRR AVOL VOUT IOUT SR IS Input Offset Current Input Bias Current Common-Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Output Swing Output Current Slew Rate Supply Current CONDITIONS
0C TA 70C, RL = 1k, VCM = 0V unless otherwise noted.
MIN TYP 1 2 25 100 4 83 73 2.5 2.0 12.0 3.0 24 20 250 98 84 7 7 13.3 3.3 40 40 400 7 10.5 MAX 4 5 600 9 UNITS mV mV V/C nA A dB dB V/mV V/mV V V mA mA V/s mA
VS = 15V, (Note 2) VS = 5V, (Note 2) VS = 15V and VS = 5V VS = 15V and VS = 5V VS = 15V, VCM = 12V and VS = 5V, VCM = 2.5V VS = 5V to 15V VS = 15V, VOUT = 10V, RL = 500 VS = 5V, VOUT = 2.5V, RL = 500 VS = 15V, RL = 500 VS = 5V, RL = 500 or 150 VS = 15V, VOUT = 12V VS = 5V, VOUT = 3V VS = 15V, AVCL = -2, (Note 3) VS = 15V and VS = 5V
Note 1: A heat sink may be required to keep the junction temperature below absolute maximum when the output is shorted indefinitely. Note 2: Input offset voltage is tested with automated test equipment in <1 second.
Note 3: Slew rate is measured in a gain of -2 between 10V on the output with 6V on the input for 15V supplies and 2V on the output with 1.75V on the input for 5V supplies. Note 4: Full power bandwidth is calculated from the slew rate measurement: FPBW = SR/2Vp.
3
LT1224
TYPICAL PERFOR A CE CHARACTERISTICS
Input Common-Mode Range vs Supply Voltage
20 8.0 TA = 25C VOS < 1mV
SUPPLY CURRENT (mA)
MAGNITUDE OF INPUT VOLTAGE (V)
OUTPUT VOLTAGE SWING (V)
15
10 +VCM 5 -VCM
0 0 5 10 15 20 SUPPLY VOLTAGE (V)
LT1224 * TPC01
Output Voltage Swing vs Resistive Load
30
OUTPUT VOLTAGE SWING (Vp-p)
25 20 15 10 5 0 10
TA = 25C VOS = 30mV
INPUT BIAS CURRENT (A)
VS = 15V
OPEN-LOOP GAIN (dB)
VS = 5V
100
1k
LOAD RESISTANCE ()
LT1224 * TPC04
Supply Current vs Temperature
10 VS = 15V 9
INPUT BIAS CURRENT (A)
SUPPLY CURRENT (mA)
4.75 4.5 4.25 4.0 3.75 3.5 -50
VS = 15V I + + IB- IB = B
2
OUTPUT SHORT-CIRCUIT CURRENT (mA)
8 7 6 5 4 -50
-25
0
25
50
75
TEMPERATURE (C)
LT1224 * TPC07
4
UW
100
Supply Current vs Supply Voltage
20
Output Voltage Swing vs Supply Voltage
TA = 25C RL = 500 VOS = 30mV 15 +VSW 10 -VSW 5
TA = 25C 7.5
7.0
6.5
6.0 0 5 10 15 20 SUPPLY VOLTAGE (V)
LT1224 * TPC02
0 0 5 10 15 20 SUPPLY VOLTAGE (V)
LT1224 * TPC03
Input Bias Current vs Input Common-Mode Voltage
5.0 VS = 15V TA = 25C IB+ + IB- IB = 2
Open-Loop Gain vs Resistive Load
100 TA = 25C
4.5
90
80
VS = 15V
4.0
70
VS = 5V
3.5
60
10k
3.0 -15
-10
-5
0
5
10
15
50 10 100 1k 10k
LT1224 * TPC06
INPUT COMMON-MODE VOLTAGE (V)
LT1224 * TPC05
LOAD RESISTANCE ()
Input Bias Current vs Temperature
50 55 50 45 40
Output Short Circuit Current vs Temperature
VS = 5V
SOURCE 35 30 25 -50
SINK
125
-25
0
25
50
75
100
125
-25
0
25
50
75
100
125
TEMPERATURE (C)
LT1224 * TPC08
TEMPERATURE (C)
LT1224 * TPC09
LT1224
TYPICAL PERFOR A CE CHARACTERISTICS
Input Noise Spectral Density
10000 100
POWER SUPPLY REJECTION RATIO (dB)
COMMON-MODE REJECTION RATIO (dB)
INPUT VOLTAGE NOISE (nV/Hz)
VS = 15V TA = 25C AV = +101 RS = 100k 1000 10
in 100 en 10 10 0.1 100k 1
100
1k FREQUENCY (Hz)
10k
Voltage Gain and Phase vs Frequency
80 VS = 15V 60 VS = 5V VS = 15V 40 VS = 5V 20 40 60 80 100 10 8 6
VOLTAGE GAIN (dB)
OUTPUT SWING (V)
4 2 0 -2 -4 -6 -8
VOLTAGE MAGNITUDE (dB)
0 TA = 25C -20 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
LT1224 * TPC14
Closed-Loop Output Impedance vs Frequency
100 VS = 15V TA = 25C AV = 1 10
48 47
OUTPUT IMPEDANCE ()
GAIN BANDWIDTH (MHz)
46 45 44 43
SLEW RATE (V/s)
1
0.1
0.01 10k
100k
1M FREQUENCY (Hz)
10M
UW
LT1224 * TPC10
Power Supply Rejection Ratio vs Frequency
100 VS = 15V TA = 25C 80 +PSRR 60 -PSRR 40
Common Mode Rejection Ratio vs Frequency
120 100 80 60 40 20 0 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) VS = 15V TA = 25C
INPUT CURRENT NOISE (pA/Hz)
20
0 100
1k
10k
100k
1M
10M
100M
FREQUENCY (Hz)
LT1224 * TPC11
LT1224 * TPC12
Output Swing vs Settling Time
10 VS = 15V TA = 25C 10mV SETTLING AV = +1 AV = -1 8 6 4 2 0 -2 -4 -6 -8 -10 0 20 40 60 80 100 120
Frequency Response vs Capacitive Load
VS = 15V TA = 25C AV = -1 C = 100pF C = 50pF
PHASE MARGIN (DEGREES)
C=0 C = 500pF C = 1000pF
20
AV = +1
AV = -1
0 100M
-10 SETTLING TIME (ns)
LT1224 * TPC13
1M
10M FREQUENCY (Hz)
100M
LT1224 * TPC15
Gain-Bandwidth vs Temperature
500 VS = 15V 450
Slew Rate vs Temperature
VS = 15V AV = -2 -SR 400 +SR 350 300 250 200 -50
100M
42 -50
-25
0
25
50
75
100
125
-25
0
25
50
75
100
125
TEMPERATURE (C)
LT1224 * TPC16
LT1224 * TPC17
TEMPERATURE (C)
LT1224 * TPC18
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LT1224
APPLICATI S I FOR ATIO U
overshoot in the unity-gain small-signal transient response. Higher noise gain configurations exhibit less overshoot as seen in the inverting gain of one response.
Small Signal, AV = 1 Small Signal, AV = -1
LT1224 * TA04
The LT1224 may be inserted directly into HA2541, HA2544, AD847, EL2020 and LM6361 applications, provided that the nulling circuitry is removed. The suggested nulling circuit for the LT1224 is shown below.
Offset Nulling
V+ 5k 1 3 0.1F 8 7 LT1224 2 4 0.1F V- 6
+ -
LT1224 * TA03
Layout and Passive Components As with any high speed operational amplifier, care must be taken in board layout in order to obtain maximum performance. Key layout issues include: use of a ground plane, minimization of stray capacitance at the input pins, short lead lengths, RF-quality bypass capacitors located close to the device (typically 0.01F to 0.1F), and use of low ESR bypass capacitors for high drive current applications (typically 1F to 10F tantalum). Sockets should be avoided when maximum frequency performance is required, although low profile sockets can provide reasonable performance up to 50MHz. For more details see Design Note 50. Feedback resistor values greater than 5k are not recommended because a pole is formed with the input capacitance which can cause peaking. If feedback resistors greater than 5k are used, a parallel capacitor of 5pF to 10pF should be used to cancel the input pole and optimize dynamic performance. Transient Response The LT1224 gain bandwidth is 45MHz when measured at f = 1MHz. The actual frequency response in unity-gain is considerably higher than 45MHz due to peaking caused by a second pole beyond the unity-gain crossover. This is reflected in the 50 phase margin and shows up as
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The large-signal responses in both inverting and noninverting gain show symmetrical slewing characteristics. Normally the noninverting response has a much faster rising edge than falling edge due to the rapid change in input common-mode voltage which affects the tail current of the input differential pair. Slew enhancement circuitry has been added to the LT1224 so that the noninverting slew rate response is balanced.
Large Signal, AV = 1 Large Signal, AV = -1
LT1224 * TA06
Input Considerations Resistors in series with the inputs are recommended for the LT1224 in applications where the differential input voltage exceeds 6V continuously or on a transient basis. An example would be in noninverting configurations with high input slew rates or when driving heavy capacitive loads. The use of balanced source resistance at each input is recommended for applications where DC accuracy must be maximized.
LT1224
APPLICATI
S I FOR ATIO
Capacitive Loading The LT1224 is stable with all capacitive loads. This is accomplished by sensing the load induced output pole and adding compensation at the amplifier gain node. 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. The photo of the small-signal response with 1000pF load shows 50% peaking. The large-signal response with a 10,000pF load shows the output slew rate being limited by the short-circuit current.
AV = - 1, CL = 1000pF AV = 1, CL = 10,000pF Cable Driving
R3 75 LT1224 - R1 1k R2 1k
LT1224 * TA07
The LT1224 can drive coaxial cable directly, but for best pulse fidelity the cable should be doubly terminated with a resistor in series with the output.
TYPICAL APPLICATI
R2 619
S
Two Op Amp Instrumentation Amplifier
R5 220 R4 10k
1MHz, 2nd Order Butterworth Filter
C2 100pF R1 619 VIN C1 500pF R3 825
-
LT1224 VOUT
+
-38dB AT 10MHz SMALL SIGNAL OVERSHOOT = 10%
LT1224 * TA08
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 circuits as described herein will not infringe on existing patent rights.
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VIN + 75 CABLE VOUT R4 75
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DAC Current-to-Voltage Converter The wide bandwidth, high slew rate and fast settling time of the LT1224 make it well-suited for current-to-voltage conversion after current output D/A converters. A typical application is shown on the first page of this data sheet with a DAC-08 type converter with a full-scale output of 2mA. A compensation capacitor is used across the feedback resistor to null the pole at the inverting input caused by the DAC output capacitance. The combination of the LT1224 and DAC settles to 40mV in 140ns for both a 0V to 10V step and for a 10V to 0V step.
LT1224 * TA06
R1 10k
R2 1k
-
LT1224
R3 1k
-
LT1224 VOUT
-
VIN
+ +
+ ( R2 + R3 ) + R2R5R3 ] = 102 R1 R4
+
AV =
1 R4 1+ 2 R3
[
TRIM R5 FOR GAIN TRIM R1 FOR COMMON-MODE REJECTION BW = 430kHz
LT1224 * TA09
7
LT1224
SI PLIFIED SCHE ATIC
V+ 7 NULL 1 8
+IN
3
V-
4
LT1224 * TA10
PACKAGE DESCRIPTIO
0.300 - 0.320 (7.620 - 8.128) 0.065 (1.651) TYP 0.009 - 0.015 (0.229 - 0.381) +0.025 0.325 -0.015
(
+0.635 8.255 -0.381
)
0.045 0.015 (1.143 0.381) 0.100 0.010 (2.540 0.254)
0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0.016 - 0.050 0.406 - 1.270
0- 8 TYP
8
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900 q FAX: (408) 434-0507 q TELEX: 499-3977
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BIAS 1
2 -IN
BIAS 2 6 OUT
Dimensions 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
0.125 (3.175) MIN
0.020 (0.508) MIN
0.250 0.010 (6.350 0.254)
0.018 0.003 (0.457 0.076)
1
2
3
4
N8 1291
S8 Package 8-Lead Plastic SOIC
8 0.053 - 0.069 (1.346 - 1.753) 0.004 - 0.010 (0.102 - 0.254) 0.228 - 0.244 (5.791 - 6.198) 0.014 - 0.019 (0.356 - 0.483) 0.050 (1.270) BSC 1
0.189 - 0.197 (4.801 - 5.004) 7 6 5
0.150 - 0.157 (3.810 - 3.988)
2
3
4
S8 1291
LT/GP 1192 5K REV A
(c) LINEAR TECHNOLOGY CORPORATION 1991

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