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PDF 363D Data sheet ( Hoja de datos )
| Número de pieza | 363D | |
| Descripción | LM363 Precision Instrumentation Amplifier | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de 363D (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
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April 1991
LM363 Precision Instrumentation Amplifier
General Description
The LM363 is a monolithic true instrumentation amplifier It
requires no external parts for fixed gains of 10 100 and
1000 High precision is attained by on-chip trimming of off-
set voltage and gain A super-beta bipolar input stage gives
very low input bias current and voltage noise extremely low
offset voltage drift and high common-mode rejection ratio
A two-stage amplifier design yields an open loop gain of
10 000 000 and a gain bandwidth product of 30 MHz yet
remains stable for all closed loop gains The LM363 oper-
ates with supply voltages from g5V to g18V with only
1 5 mA current drain
The LM363’s low voltage noise low offset voltage and off-
set voltage drift make it ideal for amplifying low-level low-
impedance transducers At the same time its low bias cur-
rent and high input impedance (both common-mode and
differential) provide excellent performance at high imped-
ance levels These features along with its ultra-high com-
mon-mode rejection allow the LM363 to be used in the
most demanding instrumentation amplifier applications re-
placing expensive hybrid module or multi-chip designs Be-
cause the LM363 is internally trimmed precision external
resistors and their associated errors are eliminated
The 16-pin dual-in-line package provides pin-strappable
gains of 10 100 or 1000 Its twin differential shield drivers
eliminate bandwidth loss due to cable capacitance Com-
pensation pins allow overcompensation to reduce band-
width and output noise or to provide greater stability with
capacitive loads Separate output force sense and refer-
ence pins permit gains between 10 and 10 000 to be pro-
grammed using external resistors
On the 8-pin metal can package gain is internally set at 10
100 or 500 but may be increased with external resistors
The shield driver and offset adjust pins are omitted on the
8-pin versions
The LM363 is rated for 0 C to 70 C
Features
Y Offset and gain pretrimmed
Y 12 nV 0Hz input noise (Ge500 1000)
Y 130 dB CMRR typical (Ge500 1000)
Y 2 nA bias current typical
Y No external parts required
Y Dual shield drivers
Y Can be used as a high performance op amp
Y Low supply current (1 5 mA typ)
Typical Connections
8-Pin Package
16-Pin Package
Ge10 2 3 4 open
Ge100 3–4 shorted
Ge1000 2–4 shorted
Connection Diagrams
Metal Can Package
TL H 5609 – 1
TL H 5609 – 33
16-Pin Dual-In-Line Package
Order Number LM363H-10
LM363H-100 or LM363H-500
See NS Package Number H08C
C1995 National Semiconductor Corporation TL H 5609
Order Number 363D
See NS Package Number D16C
TL H 5609 – 2
RRD-B30M115 Printed in U S A
1 page  
Typical Performance Characteristics (Continued)
Output Current Limit
Input Noise Voltage
Input Current Noise
Input Current vs Voltage
Overdrive
Gain Non-Linearity
Gain Error vs Frequency
Gain Error vs Frequency
Positive Power Supply
Rejection
Trimmed to zero at 100 Hz
Negative Power Supply
Rejection
Trimmed to zero at 100 Hz
Negative Power Supply
Rejection
Negative Power Supply
Rejection
Negative Power Supply
Rejection
TL H 5609 – 4
5
5 Page 
Application Hints (Continued)
Because the LM363’s offset voltage is so low to begin with
offset nulling has a negligible effect on offset temperature
drift For example zeroing a 100 mV offset assuming external
resistor TC of 200 ppm C and worst-case internal resistor
TC results in an additional drift component of 0 08 mV C
For this reason drift specifications are guaranteed with or
without external offset nulling
GAIN ADJUSTMENT
Gain may be increased by adding an external voltage divid-
er between output force and sense and reference the pre-
ferred connection is shown in Figure 4 Since both the
sense and reference pins look like 50 kX (g20 kX) to Vb
impedances presented to both pins must be equal to avoid
offset error For example a 100X imbalance can create a
worst-case output offset of 50 mV creating an input-re-
ferred error of 5 mV at Ge10 or 50 mV at Ge1000
Increasing gain this way increases output offset error An
LM363H-100 may have an output offset of 5 mV resulting in
input referred offset component of 50 mV Raising the gain
to 200 yields a 10 mV error at the output and changes input
referred error by an additional 50 mV
External resistors connected to the reference and sense
pins can only increase the gain If ultra-low output imped-
ance is not critical the technique in Figure 5 can be used to
trim the gain to nominal value Alternatively the VOS adjust-
ment terminals on the 16-pin package may be used to trim
the gain (Figure 10b )
TL H 5609–12
R1 and R2 should be as low as possible to avoid errors due to 50 kX
input impedance of reference and sense pins Total resistance
(R2a2R1) should be above 4 kX however to prevent excessive load
on the LM363 output The exact formula for calculating gain (G) is
J2R1 R1
GeGO
1a a
R2 50k
GOepreset gain
The last term may be ignored in applications where gain accuracy is not
critical The table below gives suggested values for R1 and R2 along
with the calculated error due to ‘‘closest value’’ standard 1% resistors
Total gain error tolerance includes contributions from LM363 GO error
and resistor tolerance (g1%) and works out to approximately 2 5% in
every case
Pinout shown is for 16-pin package This same technique can also be
used with 8-pin versions
Gain Increase
R1
R2
Error (typ)
15
1 21k
5k
a0 6%
2
1 21k
2 49k
b0 2%
25
2k
2 74k
0
3
2k
2 05k
b0 3%
4
1 78k
1 21k
b0 6%
5
2k
1k
a0 8%
6
2 49k
1k
a0 5%
7
2 94k
1k
b0 9%
8
3 48k
1k
a0 4%
9
3 92k
1k
b0 9%
10
4 42k
1k
b0 7%
FIGURE 4 Increasing Gain
Pinout shown is for 8-pin versions
This same technique can also be used
with 16-pin version
TL H 5609 – 13
FIGURE 5 Adjusting Gain Alternate Technique
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet 363D.PDF ] | |
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