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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 LT(R)1220 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.
, LTC and LT are registered trademarks of Linear Technology Corporation C-Load is a trademark of Linear Technology Corporation
APPLICATIO S
s s s s s s
Wideband Amplifiers Buffers Active Filters Video and RF Amplification Cable Drivers 8-, 10-, 12-Bit Data Acquisition Systems
TYPICAL APPLICATIO
R5 220 R1 10k R2 1k
Two Op Amp Instrumentation Amplifier
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
U
LT1220 * TA02
U
U
+
-
1
LT1220 ABSOLUTE AXI U RATI GS (Note 1)
Operating Temperature Range LT1220C ........................................... - 40C TO 85C LT1220M (OBSOLETE) ............... - 55C to 150C Maximum Junction Temperature (See Below) Plastic Package ............................................... 150C Ceramic Package (OBSOLETE) .................. 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 2) ........... Indefinite Specified Temperature Range LT1220C (Note 3) ................................... 0C to 70C LT1220M (OBSOLETE) ............... - 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 LT1220CH LT1220MH
V- H PACKAGE 8-LEAD TO-5 METAL CAN TJMAX = 175C, JA = 150C/W
OBSOLETE PACKAGE
Consider the N8 or S8 Packages for Alternate Source
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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 (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
TA = 25C, VS = 15V, 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 4)
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 5) 10V Peak (Note 6) f = 1MHz
2
U
U
W
WW
U
W
TOP VIEW NULL 1 -IN 2 +IN 3 V- 4 8 7 6 5 NULL V+ VOUT NC
ORDER PART NUMBER LT1220CN8 LT1220CS8 S8 PART MARKING 1220
S8 PACKAGE N8 PACKAGE 8-LEAD PLASTIC DIP 8-LEAD PLASTIC SOIC TJMAX = 150C, JA = 130C/W (N) TJMAX = 150C, JA = 190C/W (S) J8 PACKAGE 8-LEAD CERAMIC DIP TJMAX = 175C, JA = 100C/W (J)
ORDER PART NUMBER OBSOLETE PACKAGE LT1220MJ8
Consider the N8 Package for Alternate Source
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 7) f = 3.58MHz, RL = 1k (Note 7) f = 3.58MHz, RL = 150 (Note 7) f = 3.58MHz, RL = 1k (Note 7) AV = 1, f = 1MHz
10.5
The q denotes the specifications which apply over the temperature range 0C TA 70C, otherwise specifications are at TA = 25C. VS = 15V, 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 4) MIN
q q q q
VCM = 12V VS = 5V to 15V VOUT = 10V, RL = 500 RL = 500 VOUT = 12V (Note 5)
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
The q denotes the specifications which apply over the temperature range - 55C TA 125C, otherwise specifications are at TA = 25C. VS = 15V, 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 4) MIN
q q q q
VCM = 12V VS = 5V to 15V VOUT = 10V, RL = 500 RL = 500 RL = 1k VOUT = 10V VOUT = 12V (Note 5)
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
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: A heat sink may be required when the output is shorted indefinitely. Note 3: 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. Consult factory.
Note 4: Input offset voltage is pulse tested and is exclusive of warm-up drift. Note 5: Slew rate is measured between 10V on an output swing of 12V. Note 6: FPBW = SR/2VP. Note 7: 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
MAGNITUDE OF INPUT VOLTAGE (V)
MAGNITUDE OF OUTPUT VOLATGE (V)
TA = 25C VOS = 0.5mV
+VCM 10 -VCM 5
SUPPLY CURRENT (mA)
15
0 0 5 10 15 SUPPLY VOLTAGE (V) 20
Output Voltage Swing vs Resistive Load
30
OUTPUT VOLTAGE SWING (VP-P)
25 20
TA = 25C VOS = 30mV INPUT BIAS CURRENT (nA)
200 100 0 -100 -200 -300 - 400
OPEN-LOOP GAIN (dB)
15V SUPPLIES 15 10 5V SUPPLIES 5 0 10 100 1k LOAD RESISTANCE () 10k
LT1220 * TPC04
Output Short-Circuit Current vs Temperature
50
OUTPUT SHORT-CIRCUIT CURRENT (mA)
INPUT VOLTAGE NOISE (nV/Hz)
45 40 35 30 25 20 -50
140 120 100 80 60 40 20 0
-25 0 25 75 50 TEMPERATURE (C) 100 125
POWER SUPPLY REJECTION RATIO (dB)
VS = 5V
4
UW
LT1220 * TPC01
Supply Current vs Supply Voltage and Temperature
9.0 TA = 25C
Output Voltage Swing vs Supply Voltage
20 TA = 25C RL = 500 VOS = 30mV 15 +VSW 10 -VSW 5
8.5
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
- 500 -15
60
-10 -5 10 0 5 INPUT COMMON MODE VOLTAGE (V)
15
10
100 1k LOAD RESISTANCE ()
10k
LT1220 * TPC06
LT1220 * TPC05
Input Noise Spectral Density
160 VS = 15V TA = 25C AV = 100
100
Power Supply Rejection Ratio vs Frequency
VS = 15V TA = 25C 80
60 +PSRR 40 -PSRR 20
10
100
1k 10k FREQUENCY (Hz)
100k
0 100
1k
100k 1M 10k 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)
10
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 -10 10mV 1mV
OUTPUT SWING (V)
Voltage Gain and Phase vs Frequency
100 VS = 15V 80
VOLTAGE GAIN (dB)
VOLTAGE MAGNITUDE (dB)
OUTPUT IMPEDANCE ()
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
Gain-Bandwidth vs Temperature
50 VS = 15V 48
GAIN-BANDWIDTH (MHz)
300 275
SLEW RATE (V/s)
TOTAL HARMONIC DISTORTION AND NOISE (%)
46 44 42 40 38 -50
-25
0 25 75 50 TEMPERATURE (C)
UW
10M
LT1220 * TPC10
Output Swing and Error vs Settling Time (Noninverting)
10 8 6 10mV 1mV 4 2 0 -2 -4 -6 -8 0 25 75 100 50 SETTLING TIME (ns) 125 -10 8 6 4
Output Swing and Error vs Settling Time (Inverting)
10mV
1mV
10mV
1mV
100M
0
25
75 100 50 SETTLING TIME (ns)
125
LT1220 * TPC11
LT1220 * TPC12
Frequency Response vs Capacitive Load
100 80
PHASE MARGIN (DEG)
10 8 6 4 2 0 -2 -4 -6 -8 -10 1 10 FREQUENCY (MHz) 100
LT1220 * TPC14
Closed-Loop Output Impedance vs Frequency
100 VS = 15V TA = 25C AV = 1 10
VS = 15V TA = 25C AV = -1
C = 100pF C = 50pF C = 500pF C = 1000pF C=0
1
0.1
0.01 10k
100k
1M 10M FREQUENCY (Hz)
100M
LT1220 * TPC15
LT1220 * TPC13
Slew Rate vs Temperature
0.01 VS = 15V AV = -1 RIN = RF = 1k +SR
Total Harmonic Distortion vs Frequency
VS = 15V VO = 3VRMS RL = 500
250 -SR 225 200 175 150 -50
0.001
AV = -1 AV = 1
100
125
-25
0 25 75 50 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
U
W
UW
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
U
U
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 * 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).
SI PLIFIED SCHE ATIC
V+ 7 NULL 1 8 BIAS 1 BIAS 2
+IN 3
V- 4
LT1220 * SS
U
W
W
U
U
W
6 OUT 2 -IN
7
LT1220
PACKAGE DESCRIPTIO
0.040 (1.016) MAX
SEATING PLANE 0.010 - 0.045* (0.254 - 1.143) 0.016 - 0.021** (0.406 - 0.533)
45TYP 0.028 - 0.034 (0.711 - 0.864)
0.110 - 0.160 (2.794 - 4.064) INSULATING STANDOFF
8
U
H Package 8-Lead TO-5 Metal Can (.200 Inch PCD)
(Reference LTC DWG # 05-08-1320)
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) 0.027 - 0.045 (0.686 - 1.143) PIN 1 0.200 (5.080) TYP *LEAD DIAMETER IS UNCONTROLLED BETWEEN THE REFERENCE PLANE AND 0.045" BELOW THE REFERENCE PLANE 0.016 - 0.024 **FOR SOLDER DIP LEAD FINISH, LEAD DIAMETER IS (0.406 - 0.610)
H8(TO-5) 0.200 PCD 1197
OBSOLETE PACKAGE
LT1220
PACKAGE DESCRIPTIO U
J8 Package 8-Lead CERDIP (Narrow .300 Inch, Hermetic)
(Reference LTC DWG # 05-08-1110)
0.005 (0.127) MIN 0.405 (10.287) MAX 8 7 6 5 0.023 - 0.045 (0.584 - 1.143) HALF LEAD OPTION 0.045 - 0.068 (1.143 - 1.727) FULL LEAD OPTION 0.300 BSC (0.762 BSC) 0.025 (0.635) RAD TYP 1 2 3 0.220 - 0.310 (5.588 - 7.874) 4 0.200 (5.080) MAX 0.015 - 0.060 (0.381 - 1.524) 0 - 15 0.045 - 0.065 (1.143 - 1.651) 0.014 - 0.026 (0.360 - 0.660) 0.100 (2.54) BSC 0.125 3.175 MIN
J8 1298
CORNER LEADS OPTION (4 PLCS)
0.008 - 0.018 (0.203 - 0.457)
NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE OR TIN PLATE LEADS
OBSOLETE PACKAGE
9
LT1220
PACKAGE DESCRIPTIO U
N8 Package 8-Lead PDIP (Narrow .300 Inch)
(Reference 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 0.045 - 0.065 (1.143 - 1.651) 0.130 0.005 (3.302 0.127) 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
0.300 - 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
)
0.100 (2.54) BSC
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
10
LT1220
PACKAGE DESCRIPTIO U
S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference 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)
SO8 1298
1 0.010 - 0.020 x 45 (0.254 - 0.508) 0.008 - 0.010 (0.203 - 0.254) 0- 8 TYP
2
3
4
0.053 - 0.069 (1.346 - 1.752)
0.004 - 0.010 (0.101 - 0.254)
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)
0.050 (1.270) BSC
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.
11
LT1220
TYPICAL APPLICATIONS N
Cable Driver
12
VIN
+
LT1220
75
75 CABLE VOUT 75
-
1k 1k
909 VIN
RELATED PARTS
PART NUMBER LT1221 LT1222 DESCRIPTION 150MHz, 250V/s Amplifier 500MHz, 200V/s Amplifier COMMENTS AV 4 Version of the LT1220 AV 10 Version of the LT1220
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507
q
U
DAC Current-to-Voltage Converter
5pF
DAC INPUTS
5k 565A TYPE
-
LT1220 VOUT
V VOS + IOS (5k) + OUT < 1/2LSB AVOL
+
LT1220 * TA04
LT1220 * TA03
1MHz, 4th Order Butterworth Filter
909 47pF 2.67k 220pF 1.1k 22pF
-
LT1220
1.1k
2.21k 470pF
-
LT1220 VOUT
+
+
LT1220 * TA05
1220fb LT/CP 0801 1.5K REV B * PRINTED IN USA
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 1991

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