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LT1055/LT1056

Precision, High Speed,

JFET Input Operational Amplifiers

–

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

1.5k

LM329

3.3M

33pF

*1% FILM

OUTPUT

1Hz TO 10kHz

0.005%

LINEARITY

LT1056



DESCRIPTION

FEATURES

■

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

APPLICATIONS

■

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

The LT1055/LT1056 JFET input operational amplifiers

combine precision specifications with high speed perfor-

mance.

For the first time, 16V/µs slew rate and 6.5MHz gain-ban-

width 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 operat-

ing currents. The lower power dissipation LT1055 achieves

lower bias and offset currents and offset voltage. The

additional 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.

and LTC are registered trademarks and LT is a trademark of Linear Technology Corporation.

TYPICAL APPLICATION

Distribution of Input Offset Voltage

(H Package)

0kHz to 10kHz Voltage-to-Frequency Converter

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 (13 pages)

PAGE 1
LT1055/LT1056 Precision, High Speed, JFET Input Operational Amplifiers U DESCRIPTION FEATURES ■ ■ ■ ■ Guaranteed Offset Voltage –55°C to 125°C Guaranteed Drift Guaranteed Bias Current 70°C 125°C Guaranteed Slew Rate 150µV Max 500µV Max 4µV/°C Max The LT1055/LT1056 JFET input operational amplifiers combine precision specifications with high speed performance. 150pA Max 2.5nA Max 12V/µs Min For the first time, 16V/µs slew rate and 6.
PAGE 2
LT1055/LT1056 W U U W W W Supply Voltage ...................................................... ±20V Differential Input Voltage ....................................... ±40V Input Voltage ......................................................... ±20V Output Short-Circuit Duration .......................... Indefinite Operating Temperature Range LT1055AM/LT1055M/LT1056AM/ LT1056M ......................................... –55°C to 125°C LT1055AC/LT1055C/LT1056AC/ LT1056C ..................................
PAGE 3
LT1055/LT1056 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER VOS Input Offset Voltage (Note1) IOS Average Temperature Coefficient of Input Offset Voltage Input Offset Current IB Input Bias Current AVOL CMRR PSRR VOUT Large-Signal Voltage Gain Common-Mode Rejection Ratio Power Supply Rejection Ratio Output Voltage Swing VS = ±15V, VCM = 0V, 0°C ≤ TA ≤ 70°C unless otherwise noted.
PAGE 4
LT1055/LT1056 U W TYPICAL PERFORMANCE CHARACTERISTICS Input Bias and Offset Currents vs Temperature BIAS OR OFFSET CURRENTS MAY BE POSITIVE OR NEGATIVE 100 BIAS CURRENT 30 10 OFFSET CURRENT 3 0 25 75 100 50 AMBIENT TEMPERATURE (°C) 125 VS = ±15V WARMED UP 800 80 TA = 125°C TA = 70°C 40 TA = 25°C 0 A 0 – 400 – 40 TA = 70°C –80 TA = 125°C –800 B A = POSITIVE INPUT CURRENT B = NEGATIVE INPUT CURRENT B –120 –15 –5 0 5 10 –10 COMMON-MODE INPUT VOLTAGE (V) LT1055/56 G01 BATTERY VOLTAGE (V)
PAGE 5
LT1055/LT1056 U W TYPICAL PERFORMANCE CHARACTERISTICS LT1055 Large-Signal Response 20mV/DIV 5V/DIV Small-Signal Response 5V/DIV LT1056 Large-Signal Response AV = 1, CL = 100pF, 0.5µs/DIV AV = 1, CL = 100pF, 0.5µs/DIV LT1055/56 G10 LT1055/56 G12 AV = 1, CL = 100pF, 0.2µs/DIV LT1055/56 G11 Undistorted Output Swing vs Frequency Slew Rate, Gain-Bandwidth vs Temperature SLEW RATE (V/µS) 24 18 LT1056 12 LT1055 GBW 20 6 4 LT1056 SLEW 10 2 LT1055 SLEW 6 VS = ±15V f0 = 1MHz FOR GBW 0 0 0.
PAGE 6
LT1055/LT1056 U W TYPICAL PERFORMANCE CHARACTERISTICS LT1055 Settling Time 10 0.5mV 5 5mV 1mV 0 5mV 2mV –5 10mV 1mV 0.5mV VS = ±15V TA = 25°C 1 0 2 14 10mV 0.
PAGE 7
LT1055/LT1056 U U W U APPLICATIONS INFORMATION The LT1055/LT1056 may be inserted directly into LF155A/ LT355A, LF156A/LT356A, OP-15 and OP-16 sockets. Offset nulling will be compatible with these devices with the wiper of the potentiometer tied to the positive supply.
PAGE 8
LT1055/LT1056 U W U U APPLICATIONS INFORMATION The voltage noise spectrum is characterized by a low 1/f corner in the 20Hz to 30Hz range, significantly lower than on other competitive JFET input op amps. Of particular interest is the fact that with any JFET IC amplifier, the frequency location of the 1/f corner is proportional to the square root of the internal gate leakage currents and, therefore, noise doubles every 20°C. Furthermore, as illustrated in the noise versus chip temperature curves, the 0.
PAGE 9
LT1055/LT1056 U U W U APPLICATIONS INFORMATION Voltage Follower with Input Exceeding the Negative Common-Mode Range Phase Reversal Protection Most industry standard JFET input op amps (e.g., LF155/ LF156, LF351, LF411, OP15/16) exhibit phase reversal at the output when the negitive common-mode limit at the input is exceeded (i.e., from –12V to –15V with ±15V supplies). This can cause lock-up in servo systems.
PAGE 10
LT1055/LT1056 U TYPICAL APPLICATIONS 12-Bit Charge Balance A/D Converter Fast “No Trims” 12-Bit Multiplying CMOS DAC Amplifier 74C00 RFEEDBACK 28k REFERENCE IN 0.003µF 14k 0.
PAGE 11
LT1055/LT1056 U TYPICAL APPLICATIONS 100kHz Voltage Controlled Oscillator 15V 2 *1% FILM RESISTOR =1N4148 22.1k + 1k 68k FINE DISTORTION TRIMS – 15pF –15V 7 6 2N4391 2N4391 5k* LT1056 3 + 4 –15V 2.5k* 2 + 2N4391 4 VR Y1 Y2 GT UP –V +15V SINE OUT 2VRMS 0kHs TO 100kHs –15 10k 10k* 22k 6 LT1056 3 +V CC W Z1 Z2 15V 15V 7 – X1 X2 U1 U2 AD639 COM 5k FREQUENCY TRIM 68k POLYSTYRENE 500pF 22M 10k 15V 2 4 4.5k –15V 15V 50k 10Hz DISTORTION TRIM –15V 100kHz DISTORTION TRIM 2k 9.
PAGE 12
LT1055/LT1056 W W SI PLIFIED SCHEMATIC NULL 5 7 V+ 7k Q8 7k Q7 NULL 1 J5 J6 J7 –INPUT 2 300Ω 7.5pF Q9 +INPUT 3 J1 J2 Q15 Q12 20Ω Q10 Q11 6 OUTPUT J3 J8 Q13 Q2 Q1 Q14 Q5 8k 200Ω 14k Q3 120µA* (160) 9pF 14k J4 120µA* (160) 800µA* (1000) Q16 400µA* (1100) 3k Q4 50Ω 4 V– *CURRENTS AS SHOWN FOR LT1055. (X) = CURRENTS FOR LT1056. LT1055/56 SCHM U PACKAGE DESCRIPTION Dimension in inches (millimeters) unless otherwise noted. N8 Package 8-Lead Plastic H Package Metal Can 0.
PAGE 13
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