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PDF LTC1250C Data sheet ( Hoja de datos )
| Número de pieza | LTC1250C | |
| Descripción | Very Low Noise Zero-Drift Bridge Amplifier | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1250
Very Low Noise
Zero-Drift Bridge Amplifier
FEATURES
s Very Low Noise: 0.75µVP-P Typ, 0.1Hz to 10Hz
s DC to 1Hz Noise Lower Than OP-07
s Full Output Swing into 1k Load
s Offset Voltage: 10µV Max
s Offset Voltage Drift: 50nV/°C Max
s Common-Mode Rejection Ratio: 110dB Min
s Power Supply Rejection Ratio: 115dB Min
s No External Components Required
s Pin-Compatible with Standard 8-Pin Op Amps
APPLICATI S
s Electronic Scales
s Strain Gauge Amplifiers
s Thermocouple Amplifiers
s High Resolution Data Acquisition
s Low Noise Transducers
s Instrumentation Amplifiers
and LTC are registered trademarks and LT is a trademark of Linear Technology Corporation.
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 standard 8-pin ceramic and
plastic DIPs, as well as an 8-pin SOIC package.
TYPICAL APPLICATI
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
1
1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
LTC1250
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 10
OUTPUT CURRENT (mA)
LTC1250 G16
Output Swing vs Output Current,
Single 5V Supply
6
VS = SINGLE 5V
5
4
3
2
1
0
0.01
0.1 1 10
OUTPUT CURRENT (mA)
LTC1250 G17
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
LTC1250 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
APPLICATI S I FOR ATIO
Input Noise
The LTC1250, like all CMOS amplifiers, exhibits two types
of low frequency noise: thermal noise and 1/f noise. The
LTC1250 uses several design modifications to minimize
these noise sources. Thermal noise is minimized by rais-
ing the gM of the front-end transistors by running them at
high bias levels and using large transistor geometries. 1/f
noise is combated by optimizing the zero-drift nulling loop
to run at twice the 1/f corner frequency, allowing it to
reduce the inherently high CMOS 1/f noise to near thermal
levels at low frequencies. The resultant noise spectrum is
quite low at frequencies below the internal 5kHz clock
80
VS = ±5V
70 RS = 10Ω
OP-27 OP-07
60
50
LTC1250
40
30
20
10
0
0.01
0.1
FREQUENCY (Hz)
1
LTC1250 F01
Figure 1. Voltage Noise vs Frequency
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LTC1250C.PDF ] | |
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