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PDF INA155U Data sheet ( Hoja de datos )
| Número de pieza | INA155U | |
| Descripción | Single-Supply/ Rail-to-Rail Output/ CMOS INSTRUMENTATION AMPLIFIER | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de INA155U (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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® INA155
INA155
For most current data sheet and other product
information, visit www.burr-brown.com
INA155
Single-Supply, Rail-to-Rail Output, CMOS
INSTRUMENTATION AMPLIFIER
FEATURES
q RAIL-TO-RAIL OUTPUT SWING: Within 10mV
q LOW OFFSET VOLTAGE: ±200µV
q LOW OFFSET DRIFT: ±5µV/°C
q INTERNAL FIXED GAIN = 10V/V OR 50V/V
q SPECIFIED TEMPERATURE RANGE:
–55°C to +125°C
q LOW INPUT BIAS CURRENT: 0.2pA
q WIDE BANDWIDTH: 550kHz in G = 10
q HIGH SLEW RATE: 6.5V/µs
q LOW COST
q SO-8 AND TINY MSOP-8 PACKAGES
APPLICATIONS
q INDUSTRIAL SENSOR AMPLIFIERS
Bridge, RTD, Thermocouple, Flow, Position
q MEDICAL EQUIPMENT
ECG, EEG, EMG Amplifiers
q DRIVING A/D CONVERTERS
q PCMCIA CARDS
q AUDIO PROCESSING
q COMMUNICATIONS
q TEST EQUIPMENT
q LOW COST AUTOMOTIVE INSTRUMENTATION
DESCRIPTION
The INA155 is a low-cost CMOS instrumentation
amplifier with rail-to-rail output swing optimized for
low voltage, single-supply operation.
Wide bandwidth (550kHz in G = 10) and high slew
rate (6.5V/µs) make the INA155 suitable for driving
sampling A/D converters as well as general purpose
and audio applications. Fast settling time allows use
with higher speed sensors and transducers and rapid
scanning data acquisition systems.
Gain can be set to 10V/V or 50V/V by pin strapping.
Gains between these two values can be obtained with
the addition of a single resistor. The INA155 is fully
specified over the supply range of +2.7 to +5.5V.
The INA155 is available in MSOP-8 and SO-8 sur-
face-mount packages. Both are specified for operation
over the temperature range –55°C to 125°C.
G = 10 pins open
RG G = 50 pins connected
1
5 200kΩ
Ref
5kΩ
22.2kΩ
22.2kΩ
VI–N 2
VI+N 3
A1
RG V+
87
INA155
5kΩ
200kΩ
VO = (VI+N – VIN– ) • G + VREF
6
A2 VO
4
V–
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111
Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1999 Burr-Brown Corporation
PDS-1529A
Printed in U.S.A. October, 1999
1 page  
TYPICAL PERFORMANCE CURVES
At TA = +25°C, VS = 5.5V, RL = 10kΩ connected to VS/2. RG pins open (G = 10), and Ref = VS /2, unless otherwise noted.
40
35
30
25
20
15
10
5
0
1
GAIN vs FREQUENCY
G = 50
G =10
10 100 1k 10k 100k 1M 10M
Frequency (Hz)
COMMON-MODE REJECTION RATIO vs FREQUENCY
120
G = 10
100
80
G = 50
60
40
20
0
0.1 1 10 100 1k 10k 100k
Frequency (Hz)
POWER SUPPLY REJECTION RATIO vs FREQUENCY
100
90
80
70
60
50
40
30
20
10
0
1
10
100
1k
10k 100k
1M
Frequency (Hz)
MAXIMUM OUTPUT VOLTAGE vs FREQUENCY
6
5
4
3
2
1
VS = 5.5V
0
1 10 100 1k 10k
Frequency (Hz)
100k
1M
SHORT-CIRCUIT CURRENT AND QUIESCENT CURRENT
vs POWER SUPPLY
55 1.8
–ISC
50 1.75
+ISC
45 1.7
40 1.65
IQ
35 1.6
30 1.55
25 1.5
2.5 3 3.5 4.0 4.5 5 5.5 6
Supply Voltage (V)
QUIESCENT CURRENT AND SHORT-CIRCUIT CURRENT
vs TEMPERATURE
2.5 100
–ISC
2.0
+ISC
1.5
IQ
1.0
80
60
40
0.5 20
0
75 –50 –25
0
0 25 50 75 100 125 150
Temperature (°C)
®
5 INA155
5 Page 
INPUT COMMON-MODE RANGE
The input common-mode range of the INA155 for various
operating conditions is shown the in Typical Performance
Curves. The common-mode input range is limited by the
output voltage swing of A1, an internal circuit node. For the G
= 10 configuration, output voltage of A1 can be expressed as:
VOUTA1 = – 1/9VREF + (1 + 1/9) VIN–
(2)
Using this equation given that the output of A1 can swing to
within 10mV of either rail, the input common-mode voltage
range can be calculated. When the input common-mode range
is exceeded (A1’s output is saturated), A2 can still be in linear
operation and respond to changes in the non-inverting input
voltage. However, the output voltage will be invalid.
The common-mode range for the G = 50 configuration is
included in the Typical Performance Curve, “Input Com-
mon-Mode Range vs Output Voltage.”
INPUT RANGE FOR BEST ACCURACY
The internal amplifiers have rail-to-rail input stages, achieved
by using complementary n- and p-channel input pairs. The
common-mode input voltage determines whether the
p-channel or the n-channel input stage is operating. The
transition between the input stages is gradual and occurs
between (V+) – 1.8V to (V+) – 0.8V. Due to these charac-
teristics operating the INA155 with input voltages within the
transition region of (V+) – 1.8V to (V+) – 0.8V results in a
shift in input offset voltage and reduced common-mode and
power supply rejection performance. Typical patterns of the
offset voltage change throughout the input common-mode
range are illustrated in Figure 6. The INA155 can be
operated below or above the transition region with excellent
results. Figure 7 demonstrates the use of the INA155 in a
single-supply, high-side current monitor. In this applica-
tion, the INA155 is operated above the transition region.
RAIL-TO-RAIL OUTPUT
A class AB output stage with common-source transistors
is used to achieve rail-to-rail output. For resistive loads
greater than 10kΩ, the output voltage can swing to within
a few millivolts of the supply rail while maintaining low
gain error. For heavier loads and over temperature, see the
typical performance curve “Output Voltage Swing vs Out-
put Current.” The INA155’s low output impedance at high
frequencies makes it suitable for directly driving Capaci-
tive Digital-to-Analog (CDAC) input A/D converters, as
shown in Figure 9.
1.00
0.80
P-Channel Operation
Transistion
Region
0.60
0.40
N-Channel
Operation
0.20
0.00
–0.20
–0.40
–0.60
–0.80
–0.100
VS = 5.5V
VS = –1.8V
VS = –0.8V
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
Input Common-Mode Voltage (V)
FIGURE 6. Input Offset Voltage Changes with Common-
Mode Voltage.
V+ NOTE: Output is referred to V+.
0.02Ω
50mV
2.5A IL
Load
25
7
1
INA155
6
84
3
G = 10
Pins 1 and 8 Open
FIGURE 7. Single-Supply, High-Side Current Monitor.
RLIM
IOVERLOAD
10mA max
RLIM
3
1
INA155
8
5
2
VREF
6
VOUT
FIGURE 8. Input Current Protection for Voltages Exceed-
ing the Supply Voltage.
+5V
INPUT PROTECTION
Device inputs are protected by ESD diodes that will conduct
if the input voltages exceed the power supplies by more than
500mV. Momentary voltages greater than 500mV beyond
the power supply can be tolerated if the current on the input
2
7
1
INA155
6
84
34
ADS7818
or
ADS7834
12-Bits
fSAMPLE = 500kHz
pins is limited to 10mA. This is easily accomplished with
input resistors RLIM as shown in Figure 8. Many input
signals are inherently current-limited to less than 10mA,
therefore, a limiting resistor is not required.
NOTE: G = 10 configuration
FIGURE 9. INA155 Directly Drives Capacitive-Input,
High-Speed A/D Converter.
®
11 INA155
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet INA155U.PDF ] | |
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