Datasheet

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LT1055/LT1056

10556fd

For more information www.linear.com/LT1055

TYPICAL APPLICATION

FEATURES DESCRIPTION

Precision, High Speed,

JFET Input Operational Amplifiers

The LT

1055/LT1056 JFET input operational amplifiers

combine precision specifications with high speed per-

formance.

For the first time

16V/µs slew rate and 6.5MHz gain

bandwidth product are simultaneously achieved with offset

voltage of typically 50µV, 1.2µV/°C drift, bias currents of

40pA at 70°C and 500pA at 125°C.

The 150µV maximum offset voltage specification is the

best available on any JFET input operational amplifier.

The LT1055 and LT1056 are differentiated by their operating

currents. The lower power dissipation LT1055 achieves

lower bias and offset currents and offset voltage. The ad

ditional power dissipation of the LT1056 permits higher

slew rate,

bandwidth and faster settling time with a slight

sacrifice in DC performance.

The voltage-to-frequency converter shown below is one

of the many applications which utilize both the precision

and high speed of the LT1055/LT1056.

For a JFET input op amp with 23V/µs guaranteed slew

rate, refer to the LT1022 data sheet.

APPLICATIONS

Guaranteed Offset Voltage: 150µV Max

–55°C to 125°C: 500µV Max

Guaranteed Drift: 4µV/°C Max

Guaranteed Bias Current

70°C: 150pA Max

125°C: 2.5nA Max

Guaranteed Slew Rate: 12V/µs Min

Available in 8-Pin PDIP and SO Packages

Precision, High Speed Instrumentation

Logarithmic Ampliﬁers

D/A Output Ampliﬁers

Photodiode Ampliﬁers

Voltage-to-Frequency Converters

Frequency-to-Voltage Converters

Fast, Precision Sample-and-Hold

L, LT, LT C , LT M, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

Distribution of Input Offset Voltage

(H Package)

1Hz to 10kHz Voltage-to-Frequency Converter

–

0V TO 10V

INPUT

10kHz

TRIM

4.7k

15V

2N3906

15V

–15V

LT1055/56 TA01

–15V

= 1N4148

0.001 (POLYSTYRENE)

0.1µF

THE LOW OFFSET VOLTAGE OF LT1056

CONTRIBUTES ONLY 0.1Hz OF ERROR

WHILE ITS HIGH SLEW RATE PERMITS

10kHz OPERATION.

0.1µF

22k

75k

1.5k

LM329

3.3M

33pF

*1% FILM

OUTPUT

1Hz TO 10kHz

0.005%

LINEARITY

LT1056

INPUT OFFSET VOLTAGE (µV)

NUMBER OF UNITS

100

140

–400

200

LT1055/56 TA02

120

400

–200

= ±15V

= 25°C

634 UNITS TESTED

FROM THREE RUNS

50% TO ±60µV

Summary of content (20 pages)

PAGE 1
LT1055/LT1056 Precision, High Speed, JFET Input Operational Amplifiers FEATURES DESCRIPTION Guaranteed Offset Voltage: 150µV Max –55°C to 125°C: 500µV Max nn Guaranteed Drift: 4µV/°C Max nn Guaranteed Bias Current 70°C: 150pA Max 125°C: 2.5nA Max nn Guaranteed Slew Rate: 12V/µs Min nn Available in 8-Pin PDIP and SO Packages The LT®1055/LT1056 JFET input operational amplifiers combine precision specifications with high speed performance. nn For the first time, 16V/µs slew rate and 6.
PAGE 2
LT1055/LT1056 ABSOLUTE MAXIMUM RATINGS (Note 1) Supply Voltage ........................................................±20V Differential Input Voltage.........................................±40V Input Voltage ...........................................................±20V Output Short-Circuit Duration........................... Indefinite Operating Temperature Range LT1055AM/LT1055M/LT1056AM/ LT1056M (OBSOLETE)....................... –55°C to 125°C LT1055AC/LT1055C/LT1056AC/ LT1056C.....................
PAGE 3
LT1055/LT1056 ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LT1055CN8#PBF LT1055CN8#TRPBF LT1055CN8 8-Lead PDIP 0°C to 70°C LT1056CN8#PBF LT1056CN8#TRPBF LT1056CN8 8-Lead PDIP 0°C to 70°C LT1055S8#PBF LT1055S8#TRPBF 1055 8-Lead Plastic SO 0°C to 70°C LT1056S8#PBF LT1056S8#TRPBF 1056 8-Lead Plastic SO 0°C to 70°C LT1055ACH#PBF LT1055ACH#TRPBF LT1055ACH 8-Lead TO-5 Metal Can 0°C to 70°C LT1055CH#PBF LT1055CH#TRPBF LT1055CH
PAGE 4
LT1055/LT1056 ELECTRICAL CHARACTERISTICS TA = 25°C. VS = ±15V, VCM = 0V unless otherwise noted.t LT1055AM/LT1056AM LT1055AC/LT1056AC SYMBOL PARAMETER SR Slew Rate GBW Gain Bandwidth Product IS Supply Current CONDITIONS LT1055 LT1056 f = 1MHz MIN TYP 10 12 13 16 LT1055 LT1056 5.0 6.5 LT1055 LT1056 2.8 5.0 Offset Voltage Adjustment Range RPOT = 100k MAX LT1055M/LT1056M LT1055CH/LT1056CH LT1055CN8/LT1056CN8 TYP 7.5 9.0 12 14 V/µs V/µs 4.5 5.5 MHz MHz 4.0 6.5 2.8 5.
PAGE 5
LT1055/LT1056 ELECTRICAL CHARACTERISTICS TA = 25°C. VS = ±15V, VCM = 0V unless otherwise noted. LT1055CS8/LT1056CS8 SYMBOL PARAMETER CONDITIONS VOS Input Offset Voltage (Note 2) IOS Input Offset Current IB Input Bias Current Input Resistance Differential Common Mode MIN TYP MAX UNITS 500 1500 µV Fully Warmed Up 5 30 pA Fully Warmed Up VCM = 10V ±30 30 ±100 150 pA pA VCM = –11V to 8V VCM = 8V to 11V 0.4 0.4 0.05 TΩ TΩ TΩ 4 pF Input Capacitance Input Noise Voltage 0.
PAGE 6
LT1055/LT1056 ELECTRICAL CHARACTERISTICS For MIL-STD components, please refer to LTC883 data sheet for test listing and parameters. Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: Offset voltage is measured under two different conditions: (a) approximately 0.
PAGE 7
LT1055/LT1056 TYPICAL PERFORMANCE CHARACTERISTICS LT1056 LT1055 0 2 6 4 TIME (SECONDS) 8 10 Voltage Noise vs Frequency 100 7 70 PEAK-TO-PEAK NOISE 5 3 50 30 fO = 10kHz 2 20 fO = 1kHz 1 10 20 30 50 60 40 CHIP TEMPERATURE (°C) 70 LT1055/56 GO7 1000 RMS NOISE VOLTAGE DENSITY (nV/√Hz) 0.1Hz TO 10Hz PEAK-TO-PEAK NOISE (µV/P-P) Noise vs Chip Temperature 10 RMS NOISE VOLTAGE DENSITY (nV/√Hz) NOISE VOLTAGE (1µV/DIVISION) 0.
PAGE 8
LT1055/LT1056 TYPICAL PERFORMANCE CHARACTERISTICS Gain, Phase Shift vs Frequency VS = ±15V TA = 25°C 20 40 GAIN (dB) GAIN LT1056 LT1055 0 20 1 10 100 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) –10 4 2 FREQUENCY (MHz) 1 6 LT1055/56 G16 1mV 5mV 2mV –5 –10 0.5mV 5mV 0 10mV 1mV 0.5mV VS = ±15V TA = 25°C 1 0 2 Common Mode Range vs Temperature 10mV 5 2mV 5mV 0 0.
PAGE 9
LT1055/LT1056 TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Supply Voltage Output Swing vs Load Resistance 8 TA = –55°C LT1056 25°C 4 TA = 125°C TA = –55°C LT1055 25°C 2 TA = 125°C 9 3 5 10 15 SUPPLY VOLTAGE (V) 20 TA = –125°C VS = ±15V 0 –3 TA = –25°C –6 –9 TA = –55°C –15 0.
PAGE 10
LT1055/LT1056 APPLICATIONS INFORMATION printed circuit board is required. Bulk leakage reduction depends on the guard ring width. The LT1055/LT1056 has the lowest offset voltage of any JFET input op amp available today. However, the offset voltage and its drift with time and temperature are still not as good as on the best bipolar amplifiers because the transconductance of FETs is considerably lower than that of bipolar transistors.
PAGE 11
LT1055/LT1056 APPLICATIONS INFORMATION Settling Time Test Circuit 15V + 0.01 DISC 10pF (TYPICAL) 15k 10µF SOLID TANTALUM 10k – –15V 0.01 DISC 50Ω 2W 15V + 10µF SOLID TANTALUM 2k + PULSE GEN INPUT (5V MIN STEP) + 2k LT1055 LT1056 15k + 10µF SOLID TANTALUM AUT OUTPUT AMPLIFIER UNDER TEST 10k 15k 2N3866 15V 2N160 1/2 U440 HP5082-8210 HEWLETT PACKARD 0.01 DISC 3Ω –15V 50Ω 3Ω 2N3866 100Ω DC ZERO 15k + 0.01 DISC OUTPUT TO SCOPE 15V 1/2 U440 –15V 15V 4.
PAGE 12
LT1055/LT1056 TYPICAL APPLICATIONS † Exponential Voltage-to-Frequency Converter for Music Synthesizers INPUT 0V TO 10V EXPONENT TRIM 2500Ω* 11.3k* 5 6 3.57k* ZERO TRIM 500pF POLYSTYRENE 15V 500k 2N3904 7 – 500Ω* 6 LT1055 3 + SAWTOOTH OUTPUT –15V 1.1k 4.7k 15V 2 4 2N3906 1k* 562Ω* LM329 4.7k 10k* 10k* 2 1k* – 2 + 3 SCALE FACTOR 1V IN OCTAVE OUT *1% METAL FILM RESISTOR PIN NUMBERED TRANSISTORS = CA3096 ARRAY 15V 3k 6 LM301A 3 1 15V 7 8 13 8 1 4 0.
PAGE 13
LT1055/LT1056 TYPICAL APPLICATIONS Fast “No Trims” 12-Bit Multiplying CMOS DAC Amplifier Fast, 16-Bit Current Comparator RFEEDBACK REFERENCE IN * = 1% FILM RESISTOR 15V – OUTPUT LT1055 IOUT2 DELAY = 250ns HP5082-2810 IOUT1 TYPICAL 12-BIT CMOS DAC 4.7k 15V + 50k* – 100k* INPUT 7 6 LT1056 3 LT1009 2.5V LT1055/56 TA05 2 15V + 4 2 3 –15V + 3k 8 7 LT1011 – OUTPUT 1 4 –15V LT1055/56 TA06 Temperature-to-Frequency Converter 15V 560Ω 1k* 1k* 15V 2N2222 10k 2N2907 6.
PAGE 14
LT1055/LT1056 TYPICAL APPLICATIONS 100kHz Voltage Controlled Oscillator 15V 2 *1% FILM RESISTOR =1N4148 100kHz DISTORTION TRIM 2k 9.09k* 22.1k 10k* 2 – 7 LT1056 3 + 6 2N4391 2N4391 5k* 4 –15V 4 –15V 2.5k* 68k FINE DISTORTION TRIMS POLYSTYRENE 500pF 22M 15V 0V TO 10V INPUT + 4.
PAGE 15
LT1055/LT1056 SIMPLIFIED SCHEMATIC NULL 5 7 V+ 7k 7k Q8 Q7 NULL 1 J5 J6 –INPUT 2 +INPUT 3 300Ω J1 7.5pF J7 Q9 J2 Q15 Q12 20Ω Q10 Q11 6 OUTPUT J3 J8 Q1 14k Q13 Q14 Q5 8k 200Ω 14k Q2 9pF Q3 120µA* (160) J4 120µA* (160) Q4 800µA* (1000) 400µA* (1100) Q16 3k 50Ω 4 V– *CURRENTS AS SHOWN FOR LT1055. (X) = CURRENTS FOR LT1056. LT1055/56 SCHM 10556fd For more information www.linear.
PAGE 16
LT1055/LT1056 PACKAGE DESCRIPTION Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. H Package 8-Lead TO-5 Metal Can (.200 Inch PCD) (Reference LTC DWG # 05-08-1320) .040 (1.016) MAX .335 – .370 (8.509 – 9.398) DIA .305 – .335 (7.747 – 8.509) .050 (1.270) MAX SEATING PLANE .165 – .185 (4.191 – 4.699) GAUGE PLANE .010 – .045* (0.254 – 1.143) REFERENCE PLANE .500 – .750 (12.700 – 19.050) .016 – .021** (0.406 – 0.533) .027 – .045 (0.686 – 1.
PAGE 17
LT1055/LT1056 PACKAGE DESCRIPTION Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. N Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510 Rev I) .400* (10.160) MAX 8 7 6 5 1 2 3 4 .255 ±.015* (6.477 ±0.381) .300 – .325 (7.620 – 8.255) .008 – .015 (0.203 – 0.381) ( +.035 .325 –.015 8.255 +0.889 –0.381 ) .045 – .065 (1.143 – 1.651) .065 (1.651) TYP .100 (2.54) BSC .130 ±.005 (3.302 ±0.127) .120 (3.048) .020 MIN (0.
PAGE 18
LT1055/LT1056 PACKAGE DESCRIPTION Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610 Rev G) .189 – .197 (4.801 – 5.004) NOTE 3 .045 ±.005 .050 BSC 8 .245 MIN .160 ±.005 .010 – .020 × 45° (0.254 – 0.508) NOTE: 1. DIMENSIONS IN 5 .150 – .157 (3.810 – 3.988) NOTE 3 1 RECOMMENDED SOLDER PAD LAYOUT .053 – .069 (1.346 – 1.752) 0°– 8° TYP .016 – .050 (0.406 – 1.
PAGE 19
LT1055/LT1056 REVISION HISTORY (Revision history begins at Rev D) REV DATE DESCRIPTION D 08/15 Corrected application circuit. PAGE NUMBER 20 10556fd 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. For more information www.linear.
PAGE 20
LT1055/LT1056 TYPICAL APPLICATION ±120V Output Precision Op Amp 125V ±25mA OUTPUT HEAT SINK OUTPUT TRANSISTORS 1µF 10k 330Ω 510Ω 2N5415 1N965 100pF 10k 2N3440 50k 2 INPUT 10k 3 – + 1M 2N2222 1k 27Ω 1N4148 7 6 LT1055 OUTPUT 4 1N4148 50k 2N2907 1M 1k 27Ω 2N5415 2N3440 1N965 10k 33pF 100k 510Ω 1µF 330Ω –125V LT1055/56 TA10 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1122 Fast Settling JFET Op Amp 340ns Settling Time, GBW = 14MHz, SR = 60V/µs LT1792 Low Noise JFET