Single-Supply Operation:
Input Voltage Range Extends to Ground,
and Output Swings to Ground While
Sinking Current
D
Input Offset Voltage 300 µV Max at 25°C for
LT1014
D
Offset Voltage Temperature Coefficient
2.5 µV/°C Max for LT1014
D
Input Offset Current 1.5 nA Max at 25°C for
LT1014
D
High Gain 1.2 V/µV Min (R
Min (R
D
Low Supply Current 2.2 mA Max at 25°C for
= 600 Ω) for LT1014
L
= 2 kΩ), 0.5 V/µV
L
LT 1014
D
Low Peak-to-Peak Noise Voltage
0.55 µV Typ
D
Low Current Noise 0.07 pA/√Hz Typ
description
The LT1014, LT1014A, and LT1014D are quad
precision operational amplifiers with 14-pin
industry-standard configuration. They feature low
offset-voltage temperature coefficient, high gain,
low supply current, and low noise.
DW PACKAGE
(TOP VIEW)
1OUT
V
2OUT
1OUT
V
2OUT
1
1IN–
2
3
1IN+
4
CC+
5
2IN+
6
2IN–
7
8
NC
J OR N PACKAGE
(TOP VIEW)
1
1IN–
2
1IN+
3
4
CC+
2IN+
5
2IN–
6
7
FK PACKAGE
(TOP VIEW)
16
15
14
13
12
11
10
14
13
12
10
4OUT
4IN–
4IN+
V
/GND
CC–
3IN+
3IN–
3OUT
9
NC
4OUT
4IN–
4IN+
V
11
CC–
3IN+
3IN–
9
3OUT
8
The LT1014, LT1014A, and LT1014D can be
operated with both dual ±
powersupplies.
The common-mode input voltage
15ĆVandsingle5ĆV
range includes ground, and the output voltage can
also swing to within a few milivolts of ground.
Crossover distortion is eliminated.
The LT1014C and LT1014 AC are characterized
for operation from 0°C to 70°C. The L T1014I and
1IN+
V
CC+
2IN+
NC
NC
1IN–
1OUT
NC
3212019
4
5
6
7
8
910111213
4IN–
4OUT
18
17
16
15
14
4IN+
NC
V
CC–
NC
3IN+
LT1014DI are characterized for operation from
–40°C to 105°C. The LT1014M, LT1014AM and
LT1014DM are characterized for operation over
the full military temperature range of –55°C to
2IN–
2OUTNC3OUT
NC – No internal connection
3IN–
125°C.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
/GND
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Copyright 1999, Texas Instruments Incorporated
1
LT1014, LT1014A, LT1014D
0°C to 70°C
µ
40°C to 105°C
µ
180µV
LT1014AMFK
LT1014AMJ
µ
QUAD PRECISION OPERATIONAL AMPLIFIERS
SLOS039C – JULY 1989 – REVISED SEPTEMBER 1999
AVAILABLE OPTIONS
T
A
°
°
°
–
–55°C to 125°C
The DW package is available taped and reeled. Add the suffix R to the device type (e.g., L T1014DDWR).
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. All voltage values, except differential voltages, are with respect to the midpoint between V
2. Differential voltages are at the noninverting input with respect to the inverting input.
Input offset voltage vs Balanced source resistance1
Input offset voltage vs Free-air temperature2
Warm-Up Change in input offset voltage vs Elapsed time3
IO
Input offset current vs Free-air temperature4
Input bias current vs Free-air temperature5
Common-mode input voltage vs Input bias current6
p
Channel separation vs Frequency11
Output saturation voltage vs Free-air temperature12
Supply-voltage rejection ratio vs Frequency14
Supply current vs Free-air temperature15
Short-circuit output current vs Elapsed time16
Equivalent input noise voltage vs Frequency17
Equivalent input noise current vs Frequency17
Peak-to-peak input noise voltage vs Time18
Pulse response (small signal) vs Time19, 21
Pulse response (large signal) vs Time20, 22, 23
Phase shift vs Frequency9
The LT1014 is fully specified for single-supply operation (V
= 0). The common-mode input voltage range
CC–
includes ground, and the output swings within a few millivolts of ground.
Furthermore, the LT1014 has specific circuitry that addresses the difficulties of single-supply operation, both
at the input and at the output. At the input, the driving signal can fall below 0 V, either inadvertently or on a
transient basis. If the input is more than a few hundred millivolts below ground, the L T1014 is designed to deal
with the following two problems that can occur:
1. On many other operational amplifiers, when the input is more than a diode drop below ground, unlimited
current flows from the substrate (V
terminal) to the input, which can destroy the unit. On the LT1014,
CC–
the 400-Ω resistors in series with the input (see schematic) protect the device even when the input is 5 V
below ground.
2. When the input is more than 400 mV below ground (at TA = 25°C), the input stage of similar type operational
amplifiers saturates, and phase reversal occurs at the output. This can cause lockup in servo systems.
Because of unique phase-reversal protection circuitry (Q21, Q22, Q27, and Q28), the LT1014 outputs do
not reverse, even when the inputs are at –1.5 V (see Figure 24).
However, this phase-reversal protection circuitry does not function when the other operational amplifier on the
LT1014 is driven hard into negative saturation at the output. Phase-reversal protection does not work on an
amplifier:
D
When 4’s output is in negative saturation (the outputs of 2 and 3 have no effect)
D
When 3’s output is in negative saturation (the outputs of 1 and 4 have no effect)
D
When 2’s output is in negative saturation (the outputs of 1 and 4 have no effect)
D
When 1’s output is in negative saturation (the outputs of 2 and 3 have no effect)
At the output, other single-supply designs either cannot swing to within 600 mV of ground or cannot sink more
than a few microproamperes while swinging to ground. The all-npn output stage of the L T1014 maintains its low
output resistance and high gain characteristics until the output is saturated. In dual-supply operations, the output
stage is free of crossover distortion.
18
– Input Voltage – VV
I(PP)
–1
–2
5
4
3
2
1
0
(a) V
= –1.5 V to 4.5 V(b) Output Phase Reversal
I(PP)
5
4
3
2
1
– Output Voltage – VV
O
0
–1
Exhibited by LM358
5
4
3
2
1
– Output Voltage – VV
O
0
–1
(c) No Phase Reversal
Exhibited by LT1014
Figure 24. Voltage-Follower Response
With Input Exceeding the Negative Common-Mode Input Voltage Range
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
LT1014, LT1014A, LT1014D
QUAD PRECISION OPERATIONAL AMPLIFIERS
SLOS039C – JULY 1989 – REVISED SEPTEMBER 1999
APPLICATION INFORMATION
comparator applications
The single-supply operation of the L T1014 can be used as a precision comparator with TTL-compatible output.
In systems using both operational amplifiers and comparators, the LT1014 can perform multiple duties (see
Figures 25 and 26).
5
4
10 mV5 mV2 mV
3
2
– Output Voltage – VV
1
O
0
Differential
Input Voltage
100 mV
0 50 100 150 200 250 300 350 400 450
t – Time – µs
Overdrive
V
CC+
V
CC–
TA = 25°C
= 5 V
= 0
Figure 25. Low-to-High-Level Output Response
for Various Input Overdrives
5
4
3
2
10 mV
– Output Voltage – VV
1
O
0
Differential
Input Voltage
Overdrive
100 mV
0 50 100 150 200 250 300 350 400 450
t – Time – µs
V
= 5 V
CC+
V
= 0
CC–
TA = 25°C
2 mV5 mV
Figure 26. High-to-Low-Level Output Response
for Various Input Overdrives
low-supply operation
The minimum supply voltage for proper operation of the L T1014 is 3.4 V (three Ni-Cad batteries). Typical supply
current at this voltage is 290 µA; therefore, power dissipation is only 1 mW per amplifier.
offset voltage and noise testing
Figure 30 shows the test circuit for measuring input offset voltage and its temperature coefficient. This circuit
with supply voltages increased to ±20 V is also used as the burn-in configuration.
The peak-to-peak equivalent input noise voltage of the LT1014 is measured using the test circuit shown in
Figure 27. The frequency response of the noise tester indicates that the 0.1-Hz corner is defined by only one
zero. The test time to measure 0.1-Hz to 10-Hz noise should not exceed 10 seconds, as this time limit acts as
an additional zero to eliminate noise contribution from the frequency band below 0.1 Hz.
An input noise-voltage test is recommended when measuring the noise of a large number of units. A 10-Hz input
noise-voltage measurement correlates well with a 0.1-Hz peak-to-peak noise reading because both results are
determined by the white noise and the location of the 1/f corner frequency.
Noise current is measured by the circuit and formula shown in Figure 28. The noise of the source resistors is
subtracted.
T exas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty . Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
CERTAIN APPLICA TIONS USING SEMICONDUCT OR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICA TIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERST OOD TO
BE FULLY AT THE CUSTOMER’S RISK.
In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
semiconductor products or services might be or are used. TI’s publication of information regarding any third
party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.
Copyright 1999, Texas Instruments Incorporated
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