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Final Electrical Specifications
LT1468 90MHz, 22V/s 16-Bit Accurate Operational Amplifier
August 1998
FEATURES
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DESCRIPTIO
90MHz Gain Bandwidth, f = 100kHz 22V/s Slew Rate Settling Time: < 1s (AV = -1, 150V, 10V Step) Maximum Input Offset Voltage: 75V Maximum Input Offset Voltage Drift: 2V/C Maximum (-) Input Bias Current: 10nA Minimum DC Gain: 1000V/mV Minimum Output Swing into 2k: 12.8V Unity Gain Stable Input Noise Voltage: 5nV/Hz Input Noise Current: 0.6pA/Hz Low Distortion, -96dBc for 100kHz, 10VP-P Specified at 5V and 15V
The LT(R)1468 is a precision high speed operational amplifier with 16-bit accuracy and less than 1s settling to 150V for 10V signals. This unique blend of precision and AC performance makes the LT1468 the optimum choice for high accuracy data acquisition applications and current-to-voltage conversion. The initial accuracy and drift characteristics of the input offset voltage and inverting input bias current are tailored for inverting applications. The 90MHz gain bandwidth ensures high open-loop gain at frequency for reducing distortion. In noninverting applications such as an ADC buffer, the low distortion and DC accuracy allow full 16-bit AC and DC performance. The 22V/s slew rate of the LT1468 improves large signal performance in applications such as active filters and instrumentation amplifiers compared to other precision op amps. The LT1468 is manufactured on Linear Technology's complementary bipolar process.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIONS
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16-Bit DAC Current-to-Voltage Converter Precision Instrumentation ADC Buffer Low Distortion Active Filters High Accuracy Data Acquisition Systems Photodiode Amplifiers
TYPICAL APPLICATIO
16-Bit DAC I-to-V Converter
20pF DAC INPUTS 16 7k
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LT1468
2k VOUT 50pF
LTC1595
+
OPTIONAL NOISE FILTER OFFSET: VOS + IB (7k) < 1LSB SETTLING TIME TO 150V = 1.8s SETTLING LIMITED BY 7k AND 20pF TO COMPENSATE DAC OUTPUT CAPACITANCE
1468 TA01
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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LT1468
ABSOLUTE
AXI U RATI GS
to V -) ...............................
PACKAGE/ORDER I FOR ATIO
TOP VIEW NULL 1
- IN + IN
36V Maximum Input Current (Note 1) ......................... 10mA Output Short Circuit Duration (Note 2) ............ Indefinite Operating Temperature Range ................ - 40C to 85C Specified Temperature Range (Note 3).. . - 40C to 85C Junction Temperature ........................................... 150C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec.)................. 300C
Total Supply Voltage (V+
8 7 6 5
DNC* V+ VOUT NULL
ORDER PART NUMBER LT1468CS8 S8 PART MARKING 1468
2 3
V- 4
S8 PACKAGE 8-LEAD PLASTIC SO * DO NOT CONNECT TJMAX = 150C, JA = 190C/W
Consult factory for Industrial and Military Grade parts.
ELECTRICAL CHARACTERISTICS
SYMBOL VOS IOS IB - IB + en in RIN CIN PARAMETER Input Offset Voltage Input Offset Current Inverting Input Bias Current Noninverting Input Bias Current Input Noise Voltage Input Noise Current Input Resistance Input Capacitance Positive Input Voltage Range Negative Input Voltage Range CMRR PSRR AVOL Common Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain f = 10kHz f = 10kHz CONDITIONS
TA = 25C, VCM = 0V unless otherwise noted.
VSUPPLY 15V 5V 5V to 15V 5V to 15V 5V to 15V 5V to 15V 5V to 15V 15V 15V 15V 15V 5V 15V 5V 12.5 2.5 100 50 MIN TYP 30 50 15 3 10 5 0.6 240 150 4 13.5 3.5 -14.5 - 4.5 96 96 100 15V 15V 5V 5V 15V 15V 5V 5V 15V 5V 15V 15V 5V 15V 5V 1000 500 1000 500 13.0 12.8 3.0 2.8 15 15 25 15 11 110 112 112 9000 5000 6000 3000 13.6 13.5 3.6 3.5 22 22 40 22 17 350 900 -12.5 -2.5 MAX 75 175 50 10 40 UNITS V V nA nA nA nV/Hz pA/Hz M k pF V V V V dB dB dB V/mV V/mV V/mV V/mV V V V V mA mA mA V/s V/s kHz kHz
VCM = 12.5V Differential
VCM = 12.5V VCM = 2.5V VS = 4.5V to 15V VOUT = 12.5V, RL = 10k VOUT = 12.5V, RL = 2k VOUT = 2.5V, RL = 10k VOUT = 2.5V, RL = 2k RL = 10k, VIN = 1mV RL = 2k, VIN = 1mV RL = 10k, VIN = 1mV RL = 2k, VIN = 1mV VOUT = 12.5V VOUT = 2.5V VOUT = 0V, VIN = 0.2V AV = -1, RL = 2k (Note 4) 10V peak, (Note 5) 3V peak, (Note 5)
15V 5V
VOUT
Output Swing
IOUT ISC SR
Output Current Short-Circuit Current Slew Rate Full-Power Bandwidth
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LT1468
ELECTRICAL CHARACTERISTICS
SYMBOL GBW tr, tf PARAMETER Gain Bandwidth Rise Time, Fall Time Overshoot Propagation Delay ts Settling Time CONDITIONS
TA = 25C, VCM = 0V unless otherwise noted.
VSUPPLY 15V 5V 15V 5V 15V 5V 15V 5V 15V 15V 5V 15V 15V 5V MIN 60 55 TYP 90 85 11 12 30 35 9 10 760 900 780 0.02 3.9 3.6 5.2 5.0 MAX UNITS MHz MHz ns ns % % ns ns ns ns ns mA mA
f = 100kHz, RL = 2k AV = 1, 10% to 90%, 0.1V AV = 1, 0.1V AV = 1, 50% VIN to 50% VOUT, 0.1V 10V Step, 0.01%, AV = -1 10V Step, 150V, AV = -1 5V Step, 0.01%, AV = -1 AV = 1, f = 100kHz
RO IS
Output Resistance Supply Current
0C TA 70C, VCM = 0V unless otherwise noted.
SYMBOL VOS PARAMETER Input Offset Voltage Input VOS Drift IOS IB - IB + CMRR PSRR AVOL Input Offset Current Input Offset Current Drift Inverting Input Bias Current Negative Input Current Drift Noninverting Input Bias Current Common Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain VCM = 12.5V VCM = 2.5V VS = 4.5V to 15V VOUT = 12.5V, RL = 10k VOUT = 12.5V, RL = 2k VOUT = 2.5V, RL = 10k VOUT = 2.5V, RL = 2k RL = 10k, VIN = 1mV RL = 2k, VIN = 1mV RL = 10k, VIN = 1mV RL = 2k, VIN = 1mV VOUT = 12.5V VOUT = 2.5V VOUT = 0V, VIN = 0.2V AV = -1, RL = 2k (Note 4) f = 100kHz, RL = 2k 15V 15V 5V 5V 15V 15V 5V 5V 15V 5V 15V 15V 5V 15V 5V 15V 5V 5V to 15V 15V 5V 94 94 98 500 250 500 250 12.9 12.7 2.9 2.7 12.5 12.5 17 13 9 55 50 6.5 6.3 5V to 15V 40 50 (Note 6) CONDITIONS VSUPPLY 15V 5V 5V to 15V 5V to 15V 60 15 0.7 MIN TYP MAX 150 250 2.0 65 UNITS V V V/C nA pA/C nA pA/C nA dB dB dB V/mV V/mV V/mV V/mV V V V V mA mA mA V/s V/s MHz MHz mA mA
VOUT
Output Swing
IOUT ISC SR GBW IS
Output Current Short-Circuit Current Slew Rate Gain Bandwidth Supply Current
3
LT1468
ELECTRICAL CHARACTERISTICS
SYMBOL VOS PARAMETER Input Offset Voltage Input VOS Drift IOS IB - IB + CMRR PSRR AVOL Input Offset Current Input Offset Current Drift Inverting Input Bias Current Negative Input Current Drift Noninverting Input Bias Current Common Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain
-40C TA 85C, VCM = 0V unless otherwise noted (Note 3).
VSUPPLY 15V 5V MIN TYP MAX 230 330 0.7 120 5V to 15V 80 5V to 15V 60 92 92 96 15V 15V 5V 5V 15V 15V 5V 5V 15V 5V 15V 15V 5V 15V 5V 15V 5V 300 150 300 150 12.8 12.6 2.8 2.6 8 8 12 10 7 45 40 7.0 6.8 30 2.5 80 UNITS V V V/C nA pA/C nA pA/C nA dB dB dB V/mV V/mV V/mV V/mV V V V V mA mA mA V/s V/s MHz MHz mA mA
CONDITIONS
(Note 6)
5V to 15V 5V to 15V
VCM = 12.5V VCM = 2.5V VS = 4.5V to 15V VOUT = 12V, RL = 10k VOUT = 10V, RL = 2k VOUT = 2.5V, RL = 10k VOUT = 2.5V, RL = 2k RL = 10k, VIN = 1mV RL = 2k, VIN = 1mV RL = 10k, VIN = 1mV RL = 2k, VIN = 1mV VOUT = 12.5V VOUT = 2.5V VOUT = 0V, VIN = 0.2V AV = -1, RL = 2k (Note 4) f = 100kHz, RL = 2k
15V 5V
VOUT
Output Swing
IOUT ISC SR GBW IS
Output Current Short-Circuit Current Slew Rate Gain Bandwidth Supply Current
Note 1: The inputs are protected by back-to-back diodes and two 100 series resistors. If the differential input voltage exceeds 0.7V, the input current should be limited to 10mA. Input voltages outside the supplies will be clamped by ESD protection devices and input currents should also be limited to10mA. Note 2: A heat sink may be required to keep the junction temperature below absolute maximum when the output is shorted indefinitely.
Note 3: The LT1468 is designed, characterized and expected to meet these extended temperature limits, but is not tested at - 40C and at 85C. Consult factory for guaranteed I grade parts. Note 4: 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 5: Full power bandwidth is calculated from the slew rate measurement: FPBW = SR/2VP Note 6: This parameter is not 100% tested.
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408)432-1900 q FAX: (408) 434-0507 q www.linear-tech.com
1468I LT/TP 0898 4K * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 1998

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