LT1055 Linear Technology Corporation, LT1055 Datasheet

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LT1055

Manufacturer Part Number
LT1055
Description
Manufacturer
Linear Technology Corporation
Datasheet
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
Available in 8-Pin PDIP and SO Packages
U
APPLICATIO S
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
U
TYPICAL APPLICATIO
1Hz to 10kHz Voltage-to-Frequency Converter
4.7k
15V
10kHZ
TRIM
75k
5k
0V TO 10V
INPUT
0.1µF
22k
3.3M
2N3906
= 1N4148
0.1µF
*1% FILM
THE LOW OFFSET VOLTAGE OF LT1056
–15V
CONTRIBUTES ONLY 0.1Hz OF ERROR
WHILE ITS HIGH SLEW RATE PERMITS
10kHz OPERATION.
JFET Input Operational Amplifiers
DESCRIPTIO
®
The LT
1055/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
bandwidth product are simultaneously achieved with off-
set 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.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
3M
0.001 (POLYSTYRENE)
OUTPUT
15V
2
1Hz TO 10kHz
7
0.005%
1.5k
6
LINEARITY
LT1056
3
+
4
–15V
33pF
LM329
LT1055/56 TA01
LT1055/LT1056
Precision, High Speed,
U
Distribution of Input Offset Voltage
(H Package)
140
= ±15V
50% TO ±60µV
V
S
T
= 25°C
A
120
634 UNITS TESTED
FROM THREE RUNS
100
80
60
40
20
0
–200
200
–400
0
INPUT OFFSET VOLTAGE (µV)
LT1055/56 TA02
400
10556fc
1

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LT1055 Summary of contents

Page 1

... 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 ...

Page 2

... LT1056CN8 +IN – OBSOLETE PACKAGE Consider the N8 Package for Alternate Source = ±15V 25° LT1055AM/LT1056AM LT1055AC/LT1056AC CONDITIONS MIN LT1055 H Package — LT1056 H Package — LT1055 N8 Package — LT1056 N8 Package — Fully Warmed Up — ORDER PART TOP VIEW NUMBER 1 8 N/C LT1055S8 ...

Page 3

... LT1055 — LT1056 — LT1055 — LT1056 — = 100k — POT LT1055AC LT1056AC CONDITIONS MIN ● LT1055 H Package — ● LT1056 H Package — ● LT1055 N8 Package — ● LT1056 N8 Package — ● H Package (Note 6) — ● N8 Package (Note 6) — ● ...

Page 4

... O = ±10V ±11V ±10V to ±18V LT1055 LT1056 f = 1MHz LT1055 LT1056 LT1055 LT1056 R = 100k POT LT1055M LT1056M TYP MAX MIN TYP MAX 180 500 — 250 1200 180 550 — 250 1250 1 ...

Page 5

... Note 2: Offset voltage is measured under two different conditions: (a) approximately 0.5 seconds after application of power; ( only, with the chip heated to approximately 38°C for the LT1055 and to 45°C for the LT1056, to account for chip temperature rise when the device is fully warmed up. ...

Page 6

... COMMON MODE INPUT VOLTAGE (V) LT1055/56 G02 Warm-Up Drift 100 = ±15V 25° LT1056CN8 40 LT1055CN8 LT1056 H PACKAGE 20 LT1055 H PACKAGE TIME AFTER POWER ON (MINUTES) LT1055/56 G05 Noise vs Chip Temperature 10 100 7 70 PEAK-TO-PEAK NOISE ...

Page 7

... LT1055 10 GAIN 140 LT1056 LT1055 0 160 = ±15V 25°C A – FREQUENCY (MHz) LT1055/56 G17 LT1055/LT1056 LT1055 Large-Signal Response 100pF, 0.5µs/DIV V L LT1055/56 G12 Output Impedence vs Frequency 100 = ±15V 100 25°C A LT1055 LT1056 ...

Page 8

... LT1055/LT1056 W U TYPICAL PERFORMANCE CHARACTERISTICS LT1055 Settling Time 10 2mV 10mV 0.5mV 5 5mV 1mV 0 5mV 2mV –5 10mV 1mV 0.5mV = ±15V 25°C A – SETTLING TIME (µS) LT1055/56 G19 Common Mode and Power Supply Rejections vs Temperature 120 = ±10V TO ±17V FOR PSRR ...

Page 9

... P The LT1055/LT1056 can also be used in LF351, LF411, AD547, AD611, OPA-111, and TL081 sockets, provided that the nulling cicuitry is removed. Because of the LT1055/ LT1056’s low offset voltage, nulling will not be necessary in most applications. Achieving Picoampere/Microvolt Performance In order to realize the picoampere-microvolt level accu- racy of the LT1055/LT1056 proper care must be exer- cised ...

Page 10

... P-P the noise of an LT1055 will be 1.8µV of its lower power dissipation and chip temperature. High Speed Operation Settling time is measured in the test circuit shown. This test configuration has two features which eliminate prob- ...

Page 11

... This can cause lock-up in servo systems. As shown below, the LT1055/LT1056 does not have this problem due to unique phase reversal protection circuitry (Q1 on simplified schematic). ...

Page 12

... OUTPUT 15V LT1055 + INPUT LT1009 2.5V LT1055/56 TA05 CLK OUTPUT (B) 10k OUTPUT (A) f (A) OUT f (B) CLK Fast, 16-Bit Current Comparator DELAY = 250ns HP5082-2810 * = 1% FILM RESISTOR 15V 50k* 2 – 100k LT1056 LT1011 3 1 – –15V 4 –15V 15V 3k OUTPUT LT1055/56 TA06 10556fc ...

Page 13

... X1 LT1056 4.5k U2 AD639 Z1 –15V COM Z2 68k 10k Y2 –V 5k 68k FREQUENCY TRIM –15V 15V 10k 10k LT1011 3 1 – 4 0.01µF –15V LM329 4.7k 4.7k –15V 15V +15V SINE OUT 2V RMS 0kHs TO 100kHs –15 LT1055/56 TA08 10556fc 13 ...

Page 14

... LT1055/LT1056 U TYPICAL APPLICATIO PLIFIED SCHE ATIC NULL 1 2 –INPUT +INPUT 14k 14k *CURRENTS AS SHOWN FOR LT1055. (X) = CURRENTS FOR LT1056. 14 12-Bit Voltage Output D/A Converter 12-BIT CURRENT OUTPUT D/A CONVERTER (e.g., 6012,565 OR DAC-80 15V 2 – LT1056 OR 4mA ...

Page 15

... TYP +.035 –.015 ) .100 +0.889 (2.54) –0.381 BSC INCHES MILLIMETERS LT1055/LT1056 REFERENCE PLANE 0.016 – 0.024 (0.406 – 0.610) H8(TO-5) 0.200 PCD 1197 .400* MAX .130 ± .005 (3.302 ± 0.127) .120 ...

Page 16

... Settling Time, GBW = 14MHz 60V/µ 6nV/√Hz Max 1kHz n www.linear.com ● 2N3440 1k 27Ω OUTPUT 27Ω 1k 2N5415 LT1055/56 TA10 .189 – .197 NOTE .150 – .157 (3.810 – 3.988) NOTE .004 – .010 (0.101 – 0.254) ...

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