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PDF LT1124 Data sheet ( Hoja de datos )
| Número de pieza | LT1124 | |
| Descripción | High Speed Precision Op Amps | |
| Fabricantes | Linear | |
| Logotipo |  |
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LT1124/LT1125
Features
Dual/Quad Low Noise,
High Speed Precision Op Amps
Description
n 100% Tested Low Voltage Noise:
2.7nV/√Hz Typ
4.2nV/√Hz Max
n Slew Rate: 4.5V/µs Typ
n Gain-Bandwidth Product: 12.5MHz Typ
n Offset Voltage,
Prime Grade: 70µV Max
Low Grade: 100µV Max
n High Voltage Gain: 5 Million Min
n Supply Current Per Amplifier: 2.75mA Max
n Common Mode Rejection: 112dB Min
n Power Supply Rejection: 116dB Min
n Available in 8-Pin SO Package
Applications
n Two and Three Op Amp Instrumentation Amplifiers
n Low Noise Signal Processing
n Active Filters
n Microvolt Accuracy Threshold Detection
n Strain Gauge Amplifiers
n Direct Coupled Audio Gain Stages
n Tape Head Preamplifiers
n Infrared Detectors
The LT®1124 dual and LT1125 quad are high performance
op amps that offer higher gain, slew rate and bandwidth
than the industry standard OP-27 and competing OP‑270/
OP-470 op amps. In addition, the LT1124/LT1125 have
lower IB and IOS than the OP-27; lower VOS and noise
than the OP-270/OP-470.
In the design, processing and testing of the device, par-
ticular attention has been paid to the optimization of the
entire distribution of several key parameters. Slew rate,
gain bandwidth and 1kHz noise are 100% tested for each
individual amplifier. Consequently, the specifications
of even the lowest cost grades (the LT1124C and the
LT1125C) have been spectacularly improved compared
to equivalent grades of competing amplifiers.
Power consumption of the LT1124 is one-half of two
OP-27s. Low power and high performance in an 8-pin
SO package make the LT1124 a first choice for surface
mounted systems and where board space is restricted.
For a decompensated version of these devices, with three
times higher slew rate and bandwidth, please see the
LT1126/LT1127 data sheet.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 4775884, 4837496.
Typical Application
Instrumentation Amplifier with Shield Driver
GUARD
+
INPUT –
3+
1/4
2
LT1125
–
1 1k
RF
3.4k
+ 10
RG
100Ω
8
1/4
LT1125
–
9
RG
100Ω
30k
15V
5+ 4
1/4
6
LT1125
– 11
–15V
7 OUTPUT
30k
GUARD
GAIN = 30 (1 + RF/RG) ≈ 1000
POWER BW = 170kHz
13 –
1/4
RF
14 3.4k
SMALL-SIGNAL BW = 400kHz
NOISE = 3.8µV/√Hz AT OUTPUT
VOS = 35µV
12 +LT1125
1k
1124/25 TA01
For more information www.linear.com/LT1124
Input Offset Voltage Distribution
(All Packages, LT1124 and LT1125)
VS = ±15V
30 TA = 25°C
758 DUALS
200 QUADS
2316 UNITS
TESTED
20
10
0
–100
–60 –20 20
60 100
INPUT OFFSET VOLTAGE (µV)
1124/25 TA02
11245ff
1
1 page  
LT1124/LT1125
Electrical Characteristics
temperature range, VS = ±15V, unless otherwise noted.
The l denotes the specifications which apply over the 0°C ≤ TA ≤ 70°C
SYMBOL PARAMETER
CONDITIONS (Note 2)
LT1124AC
LT1125AC
MIN TYP MAX
LT1124C
LT1125C
MIN TYP MAX
UNITS
VOS Input Offset Voltage
LT1124
LT1125
l 35 120
l 40 140
45 170
50 210
µV
µV
∆VOS Average Input Offset
∆Temp Voltage Drift
(Note 5)
l 0.3 1
0.4 1.5 µV/°C
IOS Input Offset Current
LT1124
LT1125
l 6 25
l 7 35
7 35
8 45
nA
nA
IB Input Bias Current
l ±8 ±35
±9 ±45
nA
VCM Input Voltage Range
l ±11.5 ±12.4
±11.5 ±12.4
V
CMRR Common Mode Rejection Ratio
VCM = ±11.5V
l 109 125
102 122
dB
PSRR Power Supply Rejection Ratio
VS = ±4V to ±18V
l 112 125
107 122
dB
AVOL Large-Signal Voltage Gain
VOUT Maximum Output Voltage Swing
RL ≥ 10k, VOUT = ±10V
RL ≥ 2k, VOUT = ±10V
RL ≥ 2k
l 4.0
l 1.5
15
3.5
l ±12.5 ±13.7
2.5 14
1.0 2.5
±12 ±13.7
V/µV
V/µV
V
SR Slew Rate
RL ≥ 2k (Notes 3, 7)
l 2.6 4
2.4 4
V/µs
IS Supply Current per Amplifier
l 2.4 3
2.4 3
mA
The l denotes the specifications which apply over the –40°C ≤ TA ≤ 85°C temperature range, VS = ±15V, unless otherwise noted. (Note 10)
SYMBOL PARAMETER
CONDITIONS (Note 2)
LT1124AC/AI
LT1125AC
MIN TYP MAX
LT1124C/I
LT1125C
MIN TYP MAX
UNITS
VOS Input Offset Voltage
LT1124
LT1125
l 40 140
l 45 160
50 200
55 240
µV
µV
∆VOS Average Input Offset
∆Temp Voltage Drift
(Note 5)
l 0.3 1
0.4 1.5 µV/°C
IOS Input Offset Current
LT1124
LT1125
l 15 40
l 15 50
17 55
17 65
nA
nA
IB
VCM
CMRR
PSRR
AVOL
Input Bias Current
Input Voltage Range
Common Mode Rejection Ratio
Power Supply Rejection Ratio
Large-Signal Voltage Gain
VOUT Maximum Output Voltage Swing
SR Slew Rate
IS Supply Current per Amplifier
VCM = ±11.4V
VS = ±4V to ±18V
RRLL
≥
≥
120k,k,VVOUOTUT==±±1100VV
RL ≥ 2k
RL ≥ 2k (Notes 3, 7)
l ±15 ±50
±17 ±65
l ±11.4 ±12.2
±11.4 ±12.2
l 107 124
101 121
l 111 124
106 121
l 3.5
l 1.2
12
3.2
2.2 12
0.8 2.3
l ±12.5 ±13.6
±12 ±13.6
l 2.4 3.9
2.1 3.9
l 2.4 3.25 2.4 3.25
nA
V
dB
dB
V/µV
V/µV
V
V/µs
mA
For more information www.linear.com/LT1124
11245ff
5
5 Page 
LT1124/LT1125
Applications Information
High Speed Operation
When the feedback around the op amp is resistive (RF),
a pole will be created with RF, the source resistance and
capacitance (RS, CS), and the amplifier input capacitance
(CIN ≈ 2pF). In low closed loop gain configurations and with
RS and RF in the kilohm range, this pole can create excess
phase shift and even oscillation. A small capacitor (CF)
in parallel with RF eliminates this problem (see Figure 2).
With RS (CS + CIN) = RFCF, the effect of the feedback pole
is completely removed.
CF
RF
–
CIN
RS CS +
OUTPUT
1124/25 F02
Figure 2. High Speed Operation
Unity Gain Buffer Applications
When RF ≤ 100Ω and the input is driven with a fast, large
signal pulse (>1V), the output waveform will look as
shown in Figure 3.
During the fast feedthrough-like portion of the output, the
input protection diodes effectively short the output to the
input and a current, limited only by the output short circuit
protection, will be drawn by the signal generator. With
RF ≥500Ω, the output is capable of handling the current
requirements (IL ≤ 20mA at 10V) and the amplifier stays
in its active mode and a smooth transition will occur.
Noise Testing
Each individual amplifier is tested to 4.2nV/√Hz voltage
noise; i.e., for the LT1124 two tests, for the LT1125 four
tests are performed. Noise testing for competing multiple
op amps, if done at all, may be sample tested or tested
using the circuit shown in Figure 4.
en OUT = √(enA)2 + (enB)2 + (enC)2 + (enD)2
If the LT1125 were tested this way, the noise limit would
be √4 • (4.2nV/√Hz)2 = 8.4nV/√Hz. But is this an effective
screen? What if three of the four amplifiers are at a typical
2.7nV/√Hz, and the fourth one was contaminated and has
6.9nV/√Hz noise?
RMS Sum = √(2.7)2 + (2.7)2 + (2.7)2 + (6.9)2 = 8.33nV/√Hz
This passes an 8.4nV/√Hz spec, yet one of the ampli-
fiers is 64% over the LT1125 spec limit. Clearly, for
proper noise measurement, the op amps have to be tested
individually.
RF
–
+
OUTPUT
4.5V/µs
1124/25 F03
Figure 3. Unity-Gain Buffer Applications
–
+A
–
+B
–
+C
–
+D OUT
1124/25 F04
Figure 4. Competing Quad Op Amp Noise Test Method
For more information www.linear.com/LT1124
11245ff
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LT1124.PDF ] | |
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