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PDF LTC1250 Data sheet ( Hoja de datos )
| Número de pieza | LTC1250 | |
| Descripción | Very Low Noise Zero-Drift Bridge Amplifier | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
■ Very Low Noise: 0.75µVP-P Typ, 0.1Hz to 10Hz
■ DC to 1Hz Noise Lower Than OP-07
■ Full Output Swing into 1k Load
■ Offset Voltage: 10µV Max
■ Offset Voltage Drift: 50nV/°C Max
■ Common Mode Rejection Ratio: 110dB Min
■ Power Supply Rejection Ratio: 115dB Min
■ No External Components Required
■ Pin Compatible with Standard 8-Pin Op Amps
■ Available in Standard 8-Pin Plastic DIP
and 8-Pin SO Packages
U
APPLICATIO S
■ Electronic Scales
■ Strain Gauge Amplifiers
■ Thermocouple Amplifiers
■ High Resolution Data Acquisition
■ Low Noise Transducers
■ Instrumentation Amplifiers
, LTC and LT are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents
including 4933642.
LTC1250
Very Low Noise
Zero-Drift Bridge Amplifier
DESCRIPTIO
The LTC®1250 is a high performance, very low noise zero-
drift operational amplifier. The LTC1250’s combination of
low front-end noise and DC precision makes it ideal for use
with low impedance bridge transducers. The LTC1250
features typical input noise of 0.75µVP-P from 0.1Hz to
10Hz, and 0.2µVP-P from 0.1Hz to 1Hz. The LTC1250 has
DC to 1Hz noise of 0.35µVP-P, surpassing that of low noise
bipolar parts including the OP-07, OP-77, and LT1012.
The LTC1250 uses the industry-standard single op amp
pinout, and requires no external components or nulling
signals, allowing it to be a plug-in replacement for bipolar
op amps.
The LTC1250 incorporates an improved output stage
capable of driving 4.3V into a 1k load with a single 5V
supply; it will swing ±4.9V into 5k with ±5V supplies. The
input common mode range includes ground with single
power supply voltages above 12V. Supply current is 3mA
with a ±5V supply, and overload recovery times from
positive and negative saturation are 0.5ms and 1.5ms,
respectively. The internal nulling clock is set at 5kHz for
optimum low frequency noise and offset drift; no external
connections are necessary.
The LTC1250 is available in a standard 8-pin plastic DIP
and 8-pin SO packages.
TYPICAL APPLICATIO
Differential Bridge Amplifier
5V 5V
50Ω
GAIN
TRIM
0.1µF
1000pF
18.2k
350Ω
STRAIN
GAUGE
2– 7
LTC1250
3+
4
1000pF 18.2k
6
–5V –5V
AV = 100
1250 TA01
Input Referred Noise 0.1Hz to 10Hz
2
VS = ±5V
AV = 10k
1
0
–1
–2
0 2 4 6 8 10
TIME (s)
LT1250 TA02
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1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
LTC1250
Transient Response
1µs/DIV
AV = 1, RL = 100k, CL = 50pF, VS = ±5V
Output Swing vs Output Current,
±5V Supply
5
4 VS = ±5V
3
2
1
0
–1
–2
–3
–4
–5
0.01
0.1 1
OUTPUT CURRENT (mA)
10
1250 G16
Output Swing vs Load
Resistance, Dual Supplies
10
9
8 VS = ±8V
RL TO GND
7
6
5 VS = ±5V
4
3 VS = ±2.5V
2
NEGATIVE SWING
1 POSITIVE SWING
0
0 1 2 3 4 5 6 7 8 9 10
LOAD RESISTANCE (kΩ)
1250 G14
Output Swing vs Output Current,
Single 5V Supply
6
VS = SINGLE 5V
5
4
3
2
1
0
0.01
0.1 1
OUTPUT CURRENT (mA)
10
1250 G17
Output Voltage Swing vs Load
Resistance, Single Supply
18
16 VS = 16V
14
12
VS = 10V
10
8
6 VS = 5V
4
2 V– = GND
RL TO GND
0
0 1 2 3 4 5 6 7 8 9 10
LOAD RESISTANCE (kΩ)
1250 G15
Short-Circuit Current
vs Temperature
40
VS = ±15V
30
20
VOUT = V –
10
0
–10
–20 VOUT = V +
– 30
– 40
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1250 G18
TEST CIRCUITS
Offset Test Circuit
100pF
100k
5V
2– 7
10Ω LTC1250 6 OUTPUT
3+
4
–5V
1250 TC01
DC to 10Hz Noise Test Circuit
100pF (for DC to 1Hz Multiply All Capacitor Values by 10)
100k
5V 5V
2– 7
10Ω
LTC1250
3+
4
6
800k
2 –8
1/2
3
LT1057
+
4
1
800k
0.04µF 6 –
800k
1/2
LT1057
5+
7
OUTPUT
–5V 0.02µF
–5V
0.01µF
1250 TC02
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5 Page 
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PACKAGE DESCRIPTIO
LTC1250
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.050 BSC
.045 ±.005
.189 – .197
(4.801 – 5.004)
NOTE 3
8 765
.245
MIN .160 ±.005
.228 – .244
(5.791 – 6.197)
.150 – .157
(3.810 – 3.988)
NOTE 3
.030 ±.005
TYP
RECOMMENDED SOLDER PAD LAYOUT
.010
(0.254
–
–
.020
0.508)
×
45°
.008 – .010
(0.203 – 0.254)
0°– 8° TYP
1
.053 – .069
(1.346 – 1.752)
2
.016 – .050
(0.406 – 1.270)
NOTE:
1. DIMENSIONS
IN
INCHES
(MILLIMETERS)
.014 – .019
(0.355 – 0.483)
TYP
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
34
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
SO8 0303
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.
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC1250.PDF ] | |
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