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PDF MAX4236 Data sheet ( Hoja de datos )
| Número de pieza | MAX4236 | |
| Descripción | SOT23 / Very High Precision / 3V/5V Rail-to-Rail Op Amps | |
| Fabricantes | Maxim Integrated | |
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Hay una vista previa y un enlace de descarga de MAX4236 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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19-2110; Rev 0; 8/01
SOT23, Very High Precision, 3V/5V
Rail-to-Rail Op Amps
General Description
The MAX4236/MAX4237 are high-precision op amps
that feature an exceptionally low offset voltage and off-
set voltage temperature coefficient without using any
chopper techniques. The MAX4236 and MAX4237 have
a typical large-signal, open-loop voltage gain of 120dB.
These devices have an ultra-low input-bias current of
1pA. The MAX4236 is unity-gain stable with a gain-
bandwidth product of 1.7MHz, while the MAX4237 is
stable for closed-loop gains greater than 5V/V with a
gain-bandwidth product of 7.5MHz. Both devices have
a shutdown function in which the quiescent current is
reduced to less than 0.1µA, and the amplifier output is
forced into a high-impedance state.
The input common-mode range of the MAX4236/
MAX4237 extends below the negative supply range, and
the output swings Rail-to-Rail®. These features make the
amplifiers ideal for applications with +3V or +5V single
power supplies. The MAX4236/MAX4237 are specified for
the extended temperature range (-40°C to +85°C) and
are available in tiny SOT23, µMAX, and SO packages. For
greater accuracy, the A grade µMAX and SO packages
are tested to guarantee 20µV (max) offset voltage at
+25°C and less then 2µV/°C drift.
Applications
Strain Gauges
Piezoelectric Sensors
Thermocouple Amplifiers
Electrochemical Sensors
Battery-Powered Instrumentation
Instrumentation Amplifiers
Rail-to-Rail is a registered trademark of Nippon Motorola, Inc.
Pin Configurations
TOP VIEW
OUT 1
VEE 2
IN+ 3
MAX4236
MAX4237
6 VCC
N.C. 1
IN- 2
5 SHDN
IN+ 3
VEE 4
MAX4236A/B
MAX4237A/B
8 SHDN
7 VCC
6 OUT
5 N.C.
4 IN-
SO-8/µMAX
SOT23-6
Features
o Ultra-Low Offset Voltage
20µV (max) at +25°C (Grade A)
50µV (max) at +25°C (Grade B, 6-Pin SOT23)
o Ultra-Low Offset Voltage Drift
2µV/°C (max) (Grade A)
4.5µV/°C (max) (Grade B, 6-Pin SOT23)
5.5µV/°C (max) (6-Pin SOT23)
o Ultra-Low 1pA Input Bias Current
o High Open-Loop Voltage Gain: 110dB (min)
(RL = 100kΩ)
o Compatible with +3V and +5V Single-Supply
Power Systems
o Ground Sensing: Input Common-Mode Range
Includes Negative Rail
o Rail-to-Rail Output Swing into a 1kΩ Load
o 350µA Quiescent Current
o Gain-Bandwidth Product
1.7MHz (MAX4236, AV = 1V/V)
7.5MHz (MAX4237, AV = 5V/V)
o 200pF Capacitive Load Handling Capability
o Shutdown Mode: 0.1µA Quiescent Current,
Places Output in a High-Impedance State
o Available in Space-Saving SOT23 and µMAX
Packages
PART
MAX4236EUT-T
MAX4236AEUA
MAX4236BEUA
MAX4236AESA
MAX4236BESA
MAX4237EUT-T
MAX4237AEUA
MAX4237BEUA
MAX4237AESA
MAX4237BESA
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
6 SOT23-6
8 µMAX
8 µMAX
8 SO
8 SO
6 SOT23-6
8 µMAX
8 µMAX
8 SO
8 SO
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
SOT23, Very High Precision, 3V/5V
Rail-To-Rail Op Amps
ELECTRICAL CHARACTERISTICS (SOT23-6) (continued)
(VCC = +2.4V to +5.5V, VEE = 0, VCM = 0, VOUT = VCC/2, RL = 100kΩ to VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical
values are at VCC = +5V and TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Power-Supply Rejection Ratio
PSRR
VCC = +2.4V to
+5.5V
VCC = +5V, RL
connected to
VCC/2,
TA = +25°C
TA = +25°C
TA = TMIN to TMAX
RL = 100kΩ,
VOUT = 15mV to
(VCC - 50mV)
RL = 1kΩ,
VOUT = 0.15V
to (VCC - 0.3V)
97 120
95
110 128
100 114
dB
Large-Signal Voltage Gain
AVOL
VCC = +5V, RL
connected to
VCC/2,
TA = TMIN to
TMAX
VCC = +3V, RL
connected to
VCC/2,
TA = +25°C
VCC = +3V, RL
connected to
VCC/2,
TA = TMIN to
TMAX
RL = 100kΩ, VOUT =
15mV to (VCC - 50mV)
RL = 1kΩ,
VOUT = 0.15V to
(VCC - 0.3V)
RL = 100kΩ,
VOUT = 15mV to
(VCC - 50mV)
RL = 1kΩ,
VOUT = 0.15V to
(VCC - 0.3V)
RL = 100kΩ,
VOUT = 15mV to
(VCC - 50mV)
RL = 1kΩ,
VOUT = 0.15V to
(VCC - 0.3V)
110
95
110 128
100 114
105
95
dB
Output Voltage Swing
VOUT
VCC = +5V,
RL connected to VCC/2,
RL = 100kΩ
VCC = +5V,
RL connected to VCC/2,
RL = 1kΩ
VCC - VOH
VOL - VEE
VCC - VOH
VOL - VEE
2 10
3 10
150 250
50 100
mV
Output Short-Circuit Current
Gain-Bandwidth Product
Slew Rate
IOUT(SC)
Shorted to VEE
Shorted to VCC
GBWP RL = ∞, CL = 15pF
SR
VCC = +5V,
VOUT = 4V step
MAX4236
MAX4237
MAX4236
MAX4237
10
mA
30
1.7
MHz
7.5
0.3
V/µs
1.3
_______________________________________________________________________________________ 5
5 Page 
SOT23, Very High Precision, 3V/5V
Rail-To-Rail Op Amps
Pin Description
SOT23
1
PIN
SO/µMAX
6
24
33
42
58
67
— 1, 5
NAME
FUNCTION
OUT
VEE
IN+
IN-
SHDN
VCC
N.C.
Amplifier Output
Negative Power Supply. Bypass with a 0.1µF capacitor to ground. Connect to GND
for single-supply operation.
Noninverting Amplifier Input
Inverting Amplifier Input
Shutdown Input. Do not leave floating. Connect to VCC for normal operation or GND
to enter the shutdown mode.
Positive Supply Input. Bypass with a 0.1µF capacitor to ground.
No Connection. Not internally connected.
Detailed Description
The MAX4236/MAX4237 are high-precision op amps
with a CMOS input stage and an excellent set of DC
and AC features. The combination of tight maximum
voltage offset, low offset tempco and very low input
current make them ideal for use in high-precision DC
circuits. They feature low-voltage operation, low-power
consumption, high-current drive with rail-to-rail output
swing and high-gain bandwidth product.
High Accuracy
The MAX4236/MAX4237 maximum input offset voltage
is 20µV (5µV, typ) for grade A version and 50µV for
grade B version at +25°C. The maximum temperature
coefficient of the offset voltage for grade A and B are
guaranteed to be 2µV/°C and 4.5µV/°C respectively.
The parts have an input bias current of 1pA. Noise
characteristics are 14nV/√Hz, and a low frequency
noise (0.1Hz to 10Hz) of 0.2µVp-p. The CMRR is
102dB, and the PSRR is 120dB. The combination is
what is necessary for the design of circuits to process
signals while keeping high signal-to-noise ratios, as in
stages preceding high-resolution converters, or when
they are produced by sensors or transducers generat-
ing very small outputs.
Rail-to-Rail Outputs, Ground-Sensing Input
The input common-mode range extends from (VEE -
0.15V) to (VCC - 1.2V) with excellent common-mode
rejection. Beyond this range, the amplifier output is a
nonlinear function of the input, but does not undergo
phase reversal or latch-up (see Typical Operating
Characteristics).
The output swings to within 150mV of the power-supply
rails with a 1kΩ load. The input ground sensing and the
rail-to-rail output substantially increase the dynamic
range.
Power-Up and Shutdown Mode
The MAX4236/MAX4237 have a shutdown option.
When the shutdown pin (SHDN) is pulled low, the sup-
ply current drops to 0.1µA, and the amplifiers are dis-
abled with the output in a high-impedance state. Pulling
SHDN high enables the amplifiers. The turn-on time for
the amplifiers to come out of shutdown is 4µs.
Applications Information
As described above, the characteristics of the
MAX4236/MAX4237 are excellent for high-precision/
accuracy circuitry, and the high impedance, low-cur-
rent, low-offset, and noise specifications are very
attractive for piezoelectric transducers applications. In
these applications, the sensors generate an amount of
electric charge proportional to the changes in the
mechanical stress applied to them. These charges are
transformed into a voltage proportional to the applied
force by injecting them into a capacitance and then
amplifying the resulting voltage. The voltage is an
inverse function of the capacitance into which the
charges generated by the transducer/ sensor are
injected. This capacitance and the resistance that dis-
charges it, define the low-frequency response of the
circuit. It is desirable, once the preferred low-frequency
response is known, to maintain the capacitance as low
as possible, because the amount of necessary
upstream amplification (and the signal-to-noise ratio
deterioration) is directly proportional to the capacitance
value. The MAX4236/MAX4237 high-impedance, low-
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet MAX4236.PDF ] | |
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