MAX4194 Maxim, MAX4194 Datasheet

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MAX4194

Manufacturer Part Number
MAX4194
Description
The MAX4194 is a variable-gain precision instrumentation amplifier that combines Rail-to-Rail; single-supply operation, outstanding precision specifications, and a high gain bandwidth
Manufacturer
Maxim
Datasheet

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The MAX4194 is a variable-gain precision instrumenta-
tion amplifier that combines Rail-to-Rail
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 precision.
The MAX4194–MAX4197 have rail-to-rail outputs and
inputs that can swing to 200mV below 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-supply,
precision differential amplifiers.
19-1468; Rev 1; 6/03
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
TOP VIEW
Medical Equipment
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Battery-Powered/Portable Equipment
Transducer Interface
Bridge Amplifier
RG-
IN+
V
IN-
EE
________________________________________________________________ Maxim Integrated Products
1
2
4
3
Micropower, Single-Supply, Rail-to-Rail,
General Description
MAX4194
SO
Precision Instrumentation Amplifiers
6
8
7
5
Applications
RG+
V
OUT
REF
CC
®
single-supply
o +2.7V Single-Supply Operation
o Low Power Consumption
o High Common-Mode Rejection: 115dB (G = +10V/V)
o Input Common-Mode Range Extends 200mV
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
MAX4194ESA
MAX4195ESA
MAX4196ESA
MAX4197ESA
MAX4194
MAX4195
MAX4196
MAX4197
Below GND
PART
93µA Supply Current
8µA Shutdown Current
PART
(MAX4195/MAX4196/MAX4197)
SHUTDOWN
REF
IN+
V
IN-
EE
1
2
4
3
Yes
Yes
Yes
No
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Ordering Information
MAX4195
MAX4196
MAX4197
SO
Pin Configurations
GAIN (V/V)
Variable
+100
+10
+1
Selector Guide
6
8
7
5
SHDN
V
OUT
FB
CC
8 SO
8 SO
8 SO
8 SO
PIN-PACKAGE
95 (G = +1V/V)
Features
CMRR (dB)
115
115
95
1

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MAX4194 Summary of contents

Page 1

... Shutdown Current (MAX4195/MAX4196/MAX4197) o High Common-Mode Rejection: 115dB (G = +10V/V) o Input Common-Mode Range Extends 200mV Below GND 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 Applications MAX4196ESA MAX4197ESA ...

Page 2

... SO (derate 5.9mW/°C above +70°C).................. 471mW Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability ...

Page 3

Micropower, Single-Supply, Rail-to-Rail, Precision Instrumentation Amplifiers ELECTRICAL CHARACTERISTICS (continued +5V 0V 25kΩ tied +25°C.) A PARAMETER SYMBOL DC Common-Mode CMR DC Rejection AC Common-Mode CMR AC Rejection ...

Page 4

... OUT / +1V/V, +10V/ +100V/V, +1000V/V MAX4194 G = +1V/V MAX4195 MAX4194 ≤ 0. +10V OUT P-P MAX4196 MAX4194 G = +100V/V MAX4197 G = +1000V/V MAX4194 +1V/V OUT P +1V +10V/V 0.1 OUT P +100V +1000V +1V/ 1kHz OUT P-P MAX4195/MAX4196/ V < V < V SHDN EE CC MAX4197 only , unless otherwise noted. Typical values are at ...

Page 5

... Note 2: Maximum output current (sinking/sourcing) in which the gain changes by less than 0.1%. Note 3: This specification represents the typical temperature coefficient of an on-chip thin film resistor. In practice, the temperature coefficient of the gain for the MAX4194 will be dominated by the temperature coefficient of the external gain-setting resistor. (V ...

Page 6

... SMALL-SIGNAL PULSE RESPONSE (GAIN = +100V/V) MAX4194 toc08 200µs/div G = +1V +100V +1000V/V 1k 10k 100k MAX4197 LARGE-SIGNAL PULSE RESPONSE (GAIN = +100V/V) MAX4194 toc06 INPUT (5mV/div) OUTPUT (500mV/div) 200µs/div MAX4197 SMALL-SIGNAL PULSE RESPONSE (GAIN = +100V/V) MAX4194 toc09 INPUT (500µV/div) OUTPUT (50mV/div) 200µ ...

Page 7

Micropower, Single-Supply, Rail-to-Rail, Precision Instrumentation Amplifiers (V = +5V 25kΩ tied VOLTAGE-NOISE DENSITY vs. FREQUENCY 1,000 G = +1V/V 100 G = +10V +1000V ...

Page 8

... Inverting Input Noninverting Input Negative Supply Voltage Feedback. Connects to OUT. Amplifier Output Positive Supply Voltage Shutdown Control INPUT OFFSET VOLTAGE vs. TEMPERATURE 100 75 MAX4197 MAX4196 -25 MAX4194 MAX4194 (G = +100V/V, - +10V/ +1000V/V) -75 MAX4195 -40 - TEMPERATURE (°C) Pin Description FUNCTION FUNCTION ...

Page 9

... IN+ Figure 3. Instrumentation Amplifier Configuration _______________________________________________________________________________________ +10V/V). The MAX4194’s gain can be externally set between +1V/V and +10,000V/V (Table 1). The Input Stage MAX4195/MAX4196/MAX4197 have on-chip gain-set- ting resistors (Figure 2), and their gains are fixed at +1V/V, +10V/V, and +100V/V, respectively. The common-mode input range for all of these ampli- ...

Page 10

... Pulling SHDN high enables the instrumentation amplifier. CLOSEST R (5%) G (Ω) ∞ * The MAX4194’s gain is set by connecting a single, 51k external gain resistor between the two RG pins (pin 1 12k and pin 8), and can be described as: 5.6k 2.7k where G is the instrumentation amplifier’s gain and R 1 ...

Page 11

... Capacitive-Load Stability The MAX4194–MAX4197 are stable for capacitive loads up to 300pF (Figure 6a). Applications that require greater capacitive-load driving capability can use an isolation resistor (Figure 6b) between the output and the capacitive load to reduce ringing on the output sig- nal ...

Page 12

... Figure 7. Strain Gauge Connection to the MAX4194 12 ______________________________________________________________________________________ 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 (V impedance (120Ω ...

Page 13

... A1 FRONT VIEW Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 13 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © ...

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