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PDF MAX4195 Data sheet ( Hoja de datos )
| Número de pieza | MAX4195 | |
| Descripción | Micropower / Single-Supply / Rail-to-Rail / Precision Instrumentation Amplifiers | |
| Fabricantes | Maxim Integrated | |
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Hay una vista previa y un enlace de descarga de MAX4195 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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19-1468; Rev 0; 4/99
Micropower, Single-Supply, Rail-to-Rail,
Precision Instrumentation Amplifiers
General Description
The MAX4194 is a variable-gain precision instrumenta-
tion amplifier that combines Rail-to-Rail® single-supply
operation, outstanding precision specifications, and a
high gain bandwidth. This amplifier is also offered in
three fixed-gain versions: the MAX4195 (G = +1V/V),
the MAX4196 (G = +10V/V), and the MAX4197 (G =
+100V/V). The fixed-gain instrumentation amplifiers fea-
ture a shutdown function that reduces the quiescent
current to 8µA. A traditional three operational amplifier
configuration is used to achieve maximum DC preci-
sion.
The MAX4194–MAX4197 have rail-to-rail outputs and
inputs that can swing to within 200mV of the negative rail
and to within 1.1V of the positive rail. All parts draw only
93µA and operate from a single +2.7V to +7.5V supply
or from dual ±1.35V to ±3.75V supplies. These amplifiers
are offered in 8-pin SO packages and are specified for
the extended temperature range (-40°C to +85°C).
See the MAX4198/MAX4199 data sheet for single-sup-
ply, precision differential amplifiers.
Applications
Medical Equipment
Thermocouple Amplifier
4–20mA Loop Transmitters
Data-Acquisition Systems
Battery-Powered/Portable Equipment
Transducer Interface
Bridge Amplifier
Features
o +2.7V Single-Supply Operation
o Low Power Consumption
93µA Supply Current
8µA Shutdown Current (MAX4195/96/97)
o High Common-Mode Rejection: 115dB (G = +10V/V)
o Low 50µV Input Offset Voltage (G ≥ +100V/V)
o Low ±0.01% Gain Error (G = +1V/V)
o 250kHz -3dB Bandwidth (G = +1V/V, MAX4194)
o Rail-to-Rail Outputs
PART
MAX4194ESA
MAX4195ESA
MAX4196ESA
MAX4197ESA
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 SO
8 SO
8 SO
8 SO
Selector Guide
PART
MAX4194
MAX4195
MAX4196
MAX4197
SHUTDOWN
No
Yes
Yes
Yes
GAIN (V/V)
Variable
+1
+10
+100
CMRR (dB)
95 (G = +1V/V)
95
115
115
Pin Configurations
TOP VIEW
RG- 1
IN- 2
IN+ 3
VEE 4
MAX4194
8 RG+
7 VCC
6 OUT
5 REF
SO
REF 1
IN- 2
IN+ 3
VEE 4
MAX4195
MAX4196
MAX4197
8 SHDN
7 VCC
6 OUT
5 FB
SO
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1 page  
Micropower, Single-Supply, Rail-to-Rail,
Precision Instrumentation Amplifiers
Typical Operating Characteristics
(VCC = +5V, VEE = 0, RL = 25kΩ tied to VCC/2, TA = +25°C, unless otherwise noted.)
MAX4194
SMALL-SIGNAL GAIN vs. FREQUENCY
4
3
2
1
0
-1
-2 G = +1V/V
-3
G = +10V/V
G = +100V/V
-4
-5
-6
100
1k 10k 100k
FREQUENCY (Hz)
1M
MAX4195/MAX4196/MAX4197
SMALL-SIGNAL GAIN vs. FREQUENCY
4
3
2
1 G = +1V/V
0
-1
-2 G = +100V/V
-3 G = +10V/V
-4
-5
-6
100 1k 10k 100k 1M
FREQUENCY (Hz)
0.1% SETTLING TIME vs. GAIN
(VOUT = 2Vp-p)
10k
1k
100
10
1
1 10 100 1k
GAIN (V/V)
MAX4194
LARGE-SIGNAL PULSE RESPONSE
(GAIN = +1V/V)
MAX4194 toc04
MAX4194
LARGE-SIGNAL PULSE RESPONSE
(GAIN = +100V/V)
MAX4194 toc05
MAX4197
LARGE-SIGNAL PULSE RESPONSE
(GAIN = +100V/V)
MAX4194 toc06
INPUT
(500mV/div)
INPUT
(5mV/div)
INPUT
(5mV/div)
OUTPUT
(500mV/div)
OUTPUT
(500mV/div)
OUTPUT
(500mV/div)
20µs/div
MAX4194
SMALL-SIGNAL PULSE RESPONSE
(GAIN = +1V/V)
MAX4194 toc07
INPUT
(50mV/div)
200µs/div
MAX4194
SMALL-SIGNAL PULSE RESPONSE
(GAIN = +100V/V)
MAX4194 toc08
INPUT
(500µV/div)
200µs/div
MAX4197
SMALL-SIGNAL PULSE RESPONSE
(GAIN = +100V/V)
MAX4194 toc09
INPUT
(500µV/div)
OUTPUT
(50mV/div)
OUTPUT
(50mV/div)
OUTPUT
(50mV/div)
20µs/div
200µs/div
200µs/div
_______________________________________________________________________________________ 5
5 Page 
Micropower, Single-Supply, Rail-to-Rail,
Precision Instrumentation Amplifiers
Power-Supply Bypassing and Layout
Good layout technique optimizes performance by
decreasing the amount of stray capacitance at the
instrumentation amplifier’s gain-setting pins. Excess
capacitance will produce peaking in the amplifier’s fre-
quency response. To decrease stray capacitance, min-
imize trace lengths by placing external components as
close to the instrumentation amplifier as possible. For
best performance, bypass each power supply to
ground with a separate 0.1µF capacitor.
Transducer Applications
The MAX4194–MAX4197 instrumentation amplifiers can
be used in various signal-conditioning circuits for ther-
mocouples, PT100s, strain gauges (displacement sen-
sors), piezoresistive transducers (PRTs), flow sensors,
and bioelectrical applications. Figure 7 shows a simpli-
fied example of how to attach four strain gauges (two
identical two-element strain gauges) to the inputs of the
MAX4194. The bridge contains four resistors, two of
which increase and two of which decrease by the same
ratio.
With a fully balanced bridge, points A (IN+) and B (IN-)
see half the excitation voltage (VBRIDGE). The low
impedance (120Ω to 350Ω) of the strain gauges, how-
ever, could cause significant voltage drop contributions
by the wires leading to the bridge, which would cause
excitation variations. Output voltage VOUT can be cal-
culated as follows:
VOUT = VAB · G
where G = (1 + 50kΩ / RG) is the gain of the instrumen-
tation amplifier.
Since VAB is directly proportional to the excitation, gain
errors may occur.
VBRIDGE
VAB = VIN+ - VIN-
RR
R = 120Ω - 350Ω
A
RR
B
RG
RG+
IN+
RG-
IN- OUT
REF
VEE
VCC
REFERENCE
MAX144
ADC
µP
Figure 7. Strain Gauge Connection to the MAX4194
___________________Chip Information
TRANSISTOR COUNT: 432
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX4195.PDF ] | |
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