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LT1220 45MHz, 250V/s Operational Amplifier
FEATURES
s s s s s s s s s s s s s
DESCRIPTIO
Gain-Bandwidth: 45MHz Unity-Gain Stable Slew Rate: 250V/s C-LoadTM Op Amp Drives Capacitive Loads Maximum Input Offset Voltage: 1mV Maximum Input Bias Current: 300nA Maximum Input Offset Current: 300nA Minimum Output Swing Into 500: 12V Minimum DC Gain: 20V/mV, RL = 500 Settling Time to 0.1%: 75ns, 10V Step Settling Time to 0.01%: 95ns, 10V Step Differential Gain: 0.1%, AV = 2, RL = 150 Differential Phase: 0.2, AV = 2, RL = 150
The LT1220 is a high speed operational amplifier with superior DC performance. The LT1220 features reduced input offset voltage, lower input bias currents and higher DC gain than devices with comparable bandwidth and slew rate. The circuit is a single gain stage that includes proprietary DC gain enhancement circuitry to obtain precision with high speed. The high gain and fast settling time make the circuit an ideal choice for data acquisition systems. The circuit is also capable of driving large capacitive loads which makes it useful in buffer or cable driver applications. The LT1220 is a member of a family of fast, high performance amplifiers that employ Linear Technology Corporation's advanced complementary bipolar processing. For applications with gains of 4 or greater the LT1221 can be used, and for gains of 10 or greater the LT1222 can be used for increased bandwidth.
and LTC are registered trademarks and LT is a trademark of Linear Technology Corporation. C-Load is a trademark of Linear Technology Cortporation.
APPLICATI
s s s s s s
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Wideband Amplifiers Buffers Active Filters Video and RF Amplification Cable Drivers 8-, 10-, 12-Bit Data Acquisition Systems
TYPICAL APPLICATION
Two Op Amp Instrumentation Amplifier
R5 220 R1 10k R2 1k R4 10k
Inverter Pulse Response
LT1220
-
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 = 450kHz LT1220 * TA01
+
-
R3 1k
LT1220
VOUT
RF = RG = 1k VS = 15V
VIN = 20V f = 2MHz
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LT1220 * TA02
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UO
+
-
1
LT1220 ABSOLUTE AXI U RATI GS
Operating Temperature Range LT1220C ........................................... - 40C TO 85C LT1220M ......................................... - 55C to 150C Maximum Junction Temperature (See Below) Plastic Package ............................................... 150C Ceramic Package ............................................. 175C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec)................. 300C Total Supply Voltage (V + to V -) .............................. 36V Differential Input Voltage ........................................ 6V Input Voltage .......................................................... VS Output Short-Circuit Duration (Note 1) ........... Indefinite Specified Temperature Range LT1220C (Note 2) ................................... 0C to 70C LT1220M ......................................... - 55C to 125C
PACKAGE/ORDER I FOR ATIO
TOP VIEW NULL 8 NULL 1 -IN 2 +IN 3 7 V+ 6 VOUT 5 NC 4
-
ORDER PART NUMBER SPECIAL ORDER CONSULT FACTORY
V H PACKAGE 8-LEAD TO-5 METAL CAN TJMAX = 175C, JA = 150C/W
Consult factory for Industrial grade parts.
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 Inut Capacitance Input Voltage Range (Positive) Input Voltage Range (Negative) Common-Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Output Swing Output Current Slew Rate Full Power Bandwidth Gain-Bandwidth
VS = 15V, TA = 25C, VCM = 0V, unless otherwise specified.
MIN TYP 0.5 100 100 17 2 45 150 2 14 - 13 114 94 50 13 26 250 4 45 MAX 1 300 300 UNITS mV nA nA nV/Hz pA/Hz M k pF V V dB dB V/mV V mA V/s MHz MHz
CONDITIONS (Note 3)
f = 10kHz f = 10kHz VCM = 12V Differential
CMRR PSRR AVOL VOUT IOUT SR GBW
VCM = 12V VS = 5V to 15V VOUT = 10V, RL = 500 RL = 500 VOUT = 12V (Note 4) 10V Peak (Note 5) f = 1MHz
2
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TOP VIEW NULL 1 -IN 2 +IN 3 V- 4 J8 PACKAGE 8-LEAD CERAMIC DIP 8 7 6 5 NULL V+ VOUT NC
ORDER PART NUMBER LT1220CN8 LT1220MJ8 LT1220CS8 S8 PART MARKING 1220
N8 PACKAGE 8-LEAD PLASTIC DIP
S8 PACKAGE 8-LEAD PLASTIC SOIC TJMAX = 175C, JA = 100C/W (J) TJMAX = 150C, JA = 130C/W (N) TJMAX = 150C, JA = 190C/W (S)
20
12 92 90 20 12 24 200
- 12
LT1220
ELECTRICAL CHARACTERISTICS
SYMBOL tr, tf PARAMETER Rise Time, Fall Time Overshoot Propagation Delay Settling Time Differential Gain Differential Phase RO IS Output Resistance Supply Current
VS = 15V, TA = 25C, VCM = 0V, unless otherwise specified.
MIN TYP 2.5 5 4.9 75 95 0.10 0.02 0.20 0.03 1 8 MAX UNITS ns % ns ns ns % % DEG DEG mA
ts
CONDITIONS AV = 1, 10% to 90%, 0.1V AV = 1, 0.1V AV = 1, 50% VIN to 50% VOUT, 0.1V 10V Step, 0.1% 10V Step, 0.01% f = 3.58MHz, RL = 150 (Note 6) f = 3.58MHz, RL = 1k (Note 6) f = 3.58MHz, RL = 150 (Note 6) f = 3.58MHz, RL = 1k (Note 6) AV = 1, f = 1MHz
10.5
VS = 15V, 0C TA 70C, VCM = 0V, unless otherwise specified.
SYMBOL VOS IOS IB CMRR PSRR AVOL VOUT IOUT SR IS PARAMETER Input Offset Voltage Input VOS Drift 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 (Note 3) MIN
q q q
VCM = 12V VS = 5V to 15V VOUT = 10V, RL = 500 RL = 500 VOUT = 12V (Note 4)
q q q q q q q
92 86 20 12 24 180
TYP 0.5 20 100 100 114 94 50 13 26 250 8
MAX 3.5 400 400
11
UNITS mV V/C nA nA dB dB V/mV V mA V/s mA
VS = 15V, - 55C TA 125C, VCM = 0V, unless otherwise specified.
SYMBOL VOS IOS IB CMRR PSRR AVOL VOUT IOUT SR IS PARAMETER Input Offset Voltage Input VOS Drift 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 (Note 3) MIN
q q q
VCM = 12V VS = 5V to 15V VOUT = 10V, RL = 500 RL = 500 RL = 1k VOUT = 10V VOUT = 12V (Note 4)
q q q q q q q q q
92 82 5 10 12 20 12 130
TYP 0.5 20 100 100 114 94 50 13 13 26 13 250 8
MAX 4 800 1000
11
UNITS mV V/C nA nA dB dB V/mV V V mA mA V/s mA
The q denotes specifications which apply over the full temperature range. Note 1: A heat sink may be required when the output is shorted indefinitely. Note 2: Commercial parts are designed to operate over - 40C to 85C, but are not tested nor guaranteed beyond 0C to 70C. Industrial grade parts specified and tested over - 40C to 85C are available on special request. Consut factory.
Note 3: Input offset voltage is pulse tested and is exclusive of warm-up drift. Note 4: Slew rate is measured between 10V on an output swing of 12V. Note 5: FPBW = SR/2VP. Note 6: Differential Gain and Phase are tested in AV = 2 with five amps in series. Attenuators of 1/2 are used as loads (75, 75 and 499, 499).
3
LT1220 TYPICAL PERFORMANCE CHARACTERISTICS
Input Common-Mode Range vs Supply Voltage
20 9.0
+VCM 10 -VCM 5
SUPPLY CURRENT (mA)
15
8.5
MAGNITUDE OF OUTPUT VOLATGE (V)
MAGNITUDE OF INPUT VOLTAGE (V)
TA = 25C VOS = 0.5mV
0 0 5 10 15 SUPPLY VOLTAGE (V) 20
Output Voltage Swing vs Resistive Load
30 OUTPUT VOLTAGE SWING (VP-P) 25 20 15V SUPPLIES 15 10 5V SUPPLIES 5 0 10 100 1k LOAD RESISTANCE () 10k
LT1220 * TPC04
TA = 25C VOS = 30mV
INPUT BIAS CURRENT (nA)
200 100 0 -100 -200 -300 - 400 - 500 -15
OPEN-LOOP GAIN (dB)
Output Short-Circuit Current vs Temperature
50
OUTPUT SHORT-CIRCUIT CURRENT (mA) 160 140
INPUT VOLTAGE NOISE (nV/Hz)
45 40 35 30 25 20 -50
POWER SUPPLY REJECTION RATIO (dB)
VS = 5V
-25
50 0 25 75 TEMPERATURE (C)
4
UW
LT1220 * TPC01
Supply Current vs Supply Voltage and Temperature
20 TA = 25C
Output Voltage Swing vs Supply Voltage
TA = 25C RL = 500 VOS = 30mV 15 +VSW 10 -VSW 5
8.0
7.5
7.0 0 5 10 15 SUPPLY VOLTAGE (V) 20
0 0 5 10 15 SUPPLY VOLTAGE (V) 20
LT1220 * TPC02
LT1220 * TPC03
Input Bias Current vs Input Common-Mode Voltage
500 400 300 IB+ IB- TA = 25C VS = 15V 110
Open-Loop Gain vs Resistive Load
TA = 25C 100 VS = 15V 90 VS = 5V 80
70
60 0 5 -10 -5 10 INPUT COMMON-MODE VOLTAGE (V) 15 10 100 1k LOAD RESISTANCE () 10k
LT1220 * TPC06
LT1220 * TPC05
Input Noise Spectral Density
100
VS = 15V TA = 25C AV = 100
Power Supply Rejection Ratio vs Frequency
VS = 15V TA = 25C 80
120 100 80 60 40 20 0
60 +PSRR 40 -PSRR 20
100
125
10
100
1k 10k FREQUENCY (Hz)
100k
0 100
1k
10k 100k 1M FREQUENCY (Hz)
10M
100M
LT1220 * TPC07
LT1220 * TPC08
LT1220 * TPC09
LT1220 TYPICAL PERFORMANCE CHARACTERISTICS
Common-Mode Rejection Ratio vs Frequency
120
COMMON-MODE REJECTION RATIO (dB)
100 80 60 40 20 0 1k 10k 100k 1M FREQUENCY (Hz)
VS = 15V TA = 25C
OUTPUT SWING (V)
2 0 -2 -4 -6 -8 10mV 1mV
OUTPUT SWING (V)
Voltage Gain and Phase vs Frequency
100 VS = 15V 80 80 VOLTAGE MAGNITUDE (dB) VS = 5V 60 40 VS = 15V 20 VS = 5V 0 TA = 25C -20 100 1k 100k 1M 10k FREQUENCY (Hz) 10M -20 100M 0 20 60 40 100 10 8 6 4 2 0 -2 -4 -6 -8 -10
OUTPUT IMPEDANCE ()
VOLTAGE GAIN (dB)
Gain-Bandwidth vs Temperature
50 VS = 15V 48 GAIN-BANDWIDTH (MHz) 46 44 42 40 38 -50 SLEW RATE (V/s) 275 250 300
VS = 15V AV = -1 RIN = RF = 1k
TOTAL HARMONIC DISTORTION AND NOISE (%)
-25
50 0 25 75 TEMPERATURE (C)
UW
10M
LT1220 * TPC10 LT1220 * TPC13
Output Swing and Error vs Settling Time (Noninverting)
10 8 6 4 10mV 1mV 10 8 6 4 2 0 -2 -4 -6 -8 0 25 75 100 50 SETTLING TIME (ns) 125 -10
Output Swing and Error vs Settling Time (Inverting)
10mV
1mV
10mV
1mV
100M
-10
0
25
75 100 50 SETTLING TIME (ns)
125
LT1220 * TPC11
LT1220 * TPC12
Frequency Response vs Capacitive Load
100
VS = 15V TA = 25C AV = -1
Closed-Loop Output Impedance vs Frequency
VS = 15V TA = 25C AV = 1 10
PHASE MARGIN (DEG)
C = 100pF C = 50pF C = 500pF C = 1000pF 1 10 FREQUENCY (MHz) 100
LT1220 * TPC14
1
C=0
0.1
0.01 10k
100k
1M 10M FREQUENCY (Hz)
100M
LT1220 * TPC15
Slew Rate vs Temperature
0.01 +SR
Total Harmonic Distortion vs Frequency
VS = 15V VO = 3VRMS RL = 500
-SR 225 200 175 150 -50
0.001
AV = -1 AV = 1
100
125
-25
50 0 25 75 TEMPERATURE (C)
100
125
0.0001 10
100
1k 10k FREQUENCY (Hz)
100k
LT1220 * TPC18
LT1220 * TPC16
LT1220 * TPC24
5
LT1220 TYPICAL PERFORMANCE CHARACTERISTICS
Small Signal, AV = 1 Large Signal, AV = 1 Large Signal, AV = 1, CL = 10,000pF
RG = 0 VS = 15V
VIN = 100mV f = 5MHz
Small Signal, AV = - 1
RF = RG = 1k VS = 15V
VIN = 100mV f = 5MHz
APPLICATIONS INFORMATION
The LT1220 may be inserted directly into HA2505/15/25, HA2541/2/4, AD817, AD847, EL2020, EL2044 and LM6361 applications, provided that the nulling circuitry is removed. The suggested nulling circuit for the LT1220 is shown in the following figure.
Offset Nulling
V+ 5k 1 3 0.1F 8 7 4 0.1F V-
LT1220 * AI01
+ -
LT1220 2
6
6
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LT1220 * TPC19 LT1220 * TPC22
RG = 0 VS = 15V
VIN = 20V f = 2MHz
LT1220 * TPC20
RG = 0 VS = 15V
VIN = 10V f = 20kHz
LT1220 * TPC21
Large Signal, AV = - 1
Small Signal, AV = - 1, CL = 1,000pF
RF = RG = 1k VS = 15V
VIN = 20V f = 2MHz
LT1220 * TPC23
RF = RG = 1k VS = 15V
VIN = 200mV f = 200kHz
LT1220 * TPC24
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Layout and Passive Components The LT1220 amplifier is easy to apply and tolerant of less than ideal layouts. For maximum performance (for example, fast settling time) use a ground plane, short lead lengths and RF-quality bypass capacitors (0.01F to 0.1F). For high driver current applications use low ESR bypass capacitors (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 resistors greater than 5k are not recommended because a pole is formed with the input capacitance which can cause peaking or oscillations.
LT1220
APPLICATIONS INFORMATION
Input Considerations Bias current cancellation circuitry is employed on the inputs of the LT1220 so the input bias current and input offset current have identical specifications. For this reason, matching the impedance on the inputs to reduce bias current errors is not necessary. Capacitive Loading The LT1220 is stable with 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. There will be peaking in the frequency domain as shown in the curve of Frequency Response vs Capacitive Load. The small-signal transient response will have more overshoot as shown in the photo of the small-signal response with 1000pF load. The large-signal response with a 10,000pF load shows the output slew rate being limited to 4V/s by the short-circuit current. The LT1220 can drive coaxial cable 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. DAC Current-to-Voltage Amplifier The high gain, low offset voltage, low input bias current, and fast settling of the LT1220 make it particularly useful as an I/V converter for current output DACs. A typical application is shown with a 565A type, 12-bit, 2mA fullscale output current DAC. The 5k resistor around the LT1220 is internal to the DAC and gives a 10V full-scale output voltage. A 5pF capacitor in parallel with the feedback resistor compensates for the DAC output capacitance and improves settling. The output of the LT1220 settles to 1/2LSB (1.2mV) in less than 300ns. The accuracy of this circuit is equal to: VERROR = VOS + (IOS x 5k) + (VOUT/AVOL) At room temperature the worst-case error is 3mV (1.2LSB). Typically the error is 1.2mV (1/2LSB). Over the commercial temperature range the worse-case error is 6mV (2.5LSB).
TYPICAL APPLICATIONS N
Cable Driver
VIN
+
LT1220
75
75 CABLE VOUT 75
-
1k 1k
LT1220 * TA03
1MHz, 4th Order Butterworth Filter
909 47pF 2.67k 220pF 1.1k 22pF 909 VIN
-
LT1220
+
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.
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DAC Current-to-Voltage Converter
12 5k 565A TYPE 5pF
DAC INPUTS
-
LT1220 VOUT
V VOS + IOS (5k) + OUT < 1/2LSB AVOL
+
LT1220 * TA04
1.1k
2.21k 470pF
-
LT1220 VOUT
+
LT1220 * TA05
7
LT1220
SI PLIFIED SCHE ATIC
V+ 7 NULL 1 8 BIAS 1 BIAS 2
+IN 3
V- 4
LT1220 * SS
PACKAGE DESCRIPTION
0.040 (1.016) MAX
H8 Package 8-Lead TO-5 Metal Can
SEATING PLANE 0.010 - 0.045 (0.254 - 1.143) 0.016 - 0.021 (0.406 - 0.533)
0.300 BSC (0.762 BSC)
J8 Package 8-Lead Ceramic Dip
0.008 - 0.018 (0.203 - 0.457) 0.385 0.025 (9.779 0.635) 0 - 15 0.045 - 0.068 (1.143 - 1.727) FULL LEAD OPTION
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS.
N8 Package 8-Lead Plastic Dip
S8 Package 8-Lead Plastic SOIC
0.008 - 0.010 (0.203 - 0.254)
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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6 OUT 2 -IN
Dimensions in inches (millimeters) unless otherwise noted.
0.335 - 0.370 (8.509 - 9.398) DIA 0.305 - 0.335 (7.747 - 8.509) 0.050 (1.270) MAX GAUGE PLANE 0.165 - 0.185 (4.191 - 4.699) REFERENCE PLANE 0.500 - 0.750 (12.700 - 19.050) 0.110 - 0.160 (2.794 - 4.064) INSULATING STANDOFF 0.405 (10.287) MAX 8 7 6 5
45TYP 0.027 - 0.034 (0.686 - 0.864)
0.027 - 0.045 (0.686 - 1.143)
0.200 - 0.230 (5.080 - 5.842) BSC
NOTE: LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE AND SEATING PLANE.
CORNER LEADS OPTION (4 PLCS)
0.200 (5.080) MAX 0.015 - 0.060 (0.381 - 1.524)
0.005 (0.127) MIN
0.023 - 0.045 (0.584 - 1.143) HALF LEAD OPTION
0.025 (0.635) RAD TYP 1 2 3
0.220 - 0.310 (5.588 - 7.874)
4
0.045 - 0.068 (1.143 - 1.727) 0.014 - 0.026 (0.360 - 0.660)
0.125 3.175 0.100 0.010 MIN (2.540 0.254) 0.400* (10.160) MAX 8 7 6 5
0.300 - 0.325 (7.620 - 8.255)
0.045 - 0.065 (1.143 - 1.651)
0.130 0.005 (3.302 0.127)
0.009 - 0.015 (0.229 - 0.381)
0.065 (1.651) TYP 0.125 (3.175) MIN
0.255 0.015* (6.477 0.381) 0.015 (0.380) 1 2 4 3 MIN *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTURSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm). 0.189 - 0.197* (4.801 - 5.004)
(
+0.025 0.325 -0.015 8.255 +0.635 -0.381
)
0.045 0.015 (1.143 0.381) 0.100 0.010 (2.540 0.254)
0.018 0.003 (0.457 0.076)
0.010 - 0.020 x 45 (0.254 - 0.508) 0- 8 TYP
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)
7
6
5
0.016 - 0.050 0.406 - 1.270
0.014 - 0.019 (0.355 - 0.483)
0.050 (1.270) BSC
0.150 - 0.157* (3.810 - 3.988)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006 INCH (0.15mm).
1
2
3
4
LT/GP 0894 5K REV A * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1991

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