View MAX4237_273654.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

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 offset 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 gainbandwidth 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 0.1A, 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(R). 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 (-40C to +85C) and are available in tiny SOT23, MAX, and SO packages. For greater accuracy, the A grade MAX and SO packages are tested to guarantee 20V (max) offset voltage at +25C and less then 2V/C drift.
Features
o Ultra-Low Offset Voltage 20V (max) at +25C (Grade A) 50V (max) at +25C (Grade B, 6-Pin SOT23) o Ultra-Low Offset Voltage Drift 2V/C (max) (Grade A) 4.5V/C (max) (Grade B, 6-Pin SOT23) 5.5V/C (max) (6-Pin SOT23) o Ultra-Low 1pA Input Bias Current o High Open-Loop Voltage Gain: 110dB (min) (RL = 100k) 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 1k Load o 350A 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: 0.1A Quiescent Current, Places Output in a High-Impedance State o Available in Space-Saving SOT23 and MAX Packages
MAX4236/MAX4237
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.
Ordering Information
PART MAX4236EUT-T MAX4236AEUA MAX4236BEUA TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 6 SOT23-6 8 MAX 8 MAX 8 SO 8 SO 6 SOT23-6 8 MAX 8 MAX 8 SO 8 SO
Pin Configurations
TOP VIEW
OUT 1 6 VCC N.C. ININ+ VEE 2 VEE 1 2 3 4 8 7 SHDN VCC OUT N.C.
MAX4236AESA MAX4236BESA MAX4237EUT-T MAX4237AEUA MAX4237BEUA MAX4237AESA MAX4237BESA
MAX4236 MAX4237
5
SHDN
MAX4236A/B MAX4237A/B SO-8/MAX
6 5
IN+ 3
4
IN-
SOT23-6
________________________________________________________________ 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.
SOT23, Very High Precision, 3V/5V Rail-To-Rail Op Amps MAX4236/MAX4237
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC - VEE) ......................................-0.3V to +6V Analog Input Voltage (IN+ or IN-) ....(VEE - 0.3V) to (VCC + 0.3V) Logic Input Voltage (SHDN) ............(VEE - 0.3V) to (VCC + 0.3V) Current into Any Pin ............................................................20mA Output Short-Circuit Duration....Continuous to Either VCC or VEE Continuous Power Dissipation (TA = +70C) 6-Pin SOT23-6 (derate 8.7mW/C above +70C) .........696mW 8-Pin MAX (derate 4.5mW/C above +70C) ..............362mW 8-Pin SO (derate 5.9mW/C above +70C)...................471mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
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.
ELECTRICAL CHARACTERISTICS (SO-8 and MAX-8)
(VCC = +2.4V to +5.5V, VEE = 0, VCM = 0, VOUT = VCC/2, RL = 100k to VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25C.) (Note 1)
PARAMETER Supply Voltage Range SYMBOL VCC CONDITIONS Guaranteed by the PSRR test VCC = +5V Quiescent Supply Current ICC VCC = +3V VCC = +5V, Grade A Input Offset Voltage VOS VCC = +5V, Grade B VCC = +5V (Note 3) (Note 2) (Note 2) Differential or common mode Guaranteed by the CMRR test VCC = +5V; -0.15V VCM (VCC - 1.2V) VCC = +3.0V; -0.15V VCM (VCC - 1.2V) Power-Supply Rejection Ratio PSRR VCC = +2.4V to +5.5V TA = +25oC TA = TMIN to TMAX TA = +25oC TA = TMIN to TMAX TA = +25 C TA = TMIN to TMAX
o
MIN 2.4
TYP 350 0.1 350 0.1 5 5 0.6 0.6 1 1 1000
MAX 5.5 440 2 440 2 20 150 50 340 2 4.5 500
UNITS V
In normal mode In shutdown mode In normal mode In shutdown mode TA = +25oC TA = TMIN to TMAX TA = +25 C TA = TMIN to TMAX Grade A Grade B
o
A
V
Input Offset Voltage Temperature Coefficient Input Bias Current Input Offset Current Input Resistance Input Common-Mode Voltage
TCVOS IB IOS RIN VCM
V/C pA pA M
-0.15 84 80 102
VCC - 1.2
V
Common-Mode Rejection Ratio
CMRR
dB 82 78 97 95 120 dB 102
2
_______________________________________________________________________________________
SOT23, Very High Precision, 3V/5V Rail-To-Rail Op Amps
ELECTRICAL CHARACTERISTICS (SO-8 and MAX-8) (continued)
(VCC = +2.4V to +5.5V, VEE = 0, VCM = 0, VOUT = VCC/2, RL = 100k to VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25C.) (Note 1)
PARAMETER SYMBOL VCC = +5V, RL connected to VCC/2, TA = +25oC VCC = +5V, RL connected to VCC/2, TA = TMIN to TMAX Large-Signal Voltage Gain AVOL VCC = +3V, RL connected to VCC/2, TA = +25oC VCC = +3V, RL connected to VCC/2, TA = TMIN to TMAX CONDITIONS RL = 100k, VOUT = 15mV to (VCC - 50mV) RL = 1k, VOUT = 0.15V to (VCC - 0.3V) RL = 100k, VOUT = 15mV to (VCC - 50mV) RL = 1k, VOUT = 0.15V to (VCC - 0.3V) RL = 100k, VOUT = 15mV to (VCC - 50mV) RL = 1k, VOUT = 0.15V to (VCC - 0.3V) RL = 100k, VOUT = 15mV to (VCC - 50mV) RL = 1k, VOUT = 0.15V to (VCC - 0.3V) VCC - VOH VOL - VEE VCC - VOH VOL - VEE MIN 110 TYP 128 MAX UNITS
MAX4236/MAX4237
105
114
110
100 dB 110 128
100
114
105
95
VCC = +5V, RL connected to VCC /2, RL = 100k Output Voltage Swing VOUT VCC = +5V, RL connected to VCC/2, RL = 1k Output Short-Circuit Current Gain-Bandwidth Product Slew Rate Settling Time Total Harmonic Distortion IOUT(SC) GBWP SR tS THD Shorted to VEE Shorted to VCC RL = , CL = 5pF VCC = +5V, VOUT = 4V step VOUT settling to within 0.01%
2 3 150 50 10 30
10 10 mV 250 100 mA MHz V/s s %
MAX4236 MAX4237 MAX4236 MAX4237 MAX4236 MAX4237
1.7 7.5 0.3 1.3 1 1 0.001
f = 5kHz, VOUT = 2Vp-p, VCC = +5V RL = 10k
_______________________________________________________________________________________
3
SOT23, Very High Precision, 3V/5V Rail-To-Rail Op Amps MAX4236/MAX4237
ELECTRICAL CHARACTERISTICS (SO-8 and MAX-8) (continued)
(VCC = +2.4V to +5.5V, VEE = 0, VCM = 0, VOUT = VCC/2, RL = 100k to VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25C.) (Note 1)
PARAMETER Input Capacitance Input Voltage Noise Density Input Noise Voltage Capacitive Load Stability Shutdown Mode Output Leakage SHDN Logic Low SHDN Logic High SHDN Input Current Shutdown Delay Time Shutdown Recovery Time t(SH) t(EN) SYMBOL CIN en enp-p CLOAD IOUT(SH) VIL VIH SHDN = VEE or VCC RL = 1k RL = 1k 0.7 VCC 1 1 4 3 f = 100kHz f = 1kHz f = 0.1Hz to 10Hz No sustained oscillations MAX4236 MAX4237 CONDITIONS MIN TYP 7.5 14 0.2 200 200 0.01 1.0 0.3 VCC MAX UNITS pF nV/Hz Vp-p pF A V V A s s
Device in shutdown mode (SHDN = VEE) VOUT = 0 to VCC
ELECTRICAL CHARACTERISTICS (SOT23-6)
(VCC = +2.4V to +5.5V, VEE = 0, VCM = 0, VOUT = VCC/2, RL = 100k to VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25C.) (Note 1)
PARAMETER Supply Voltage Range SYMBOL VCC CONDITIONS Guaranteed by the PSRR test VCC = +5V Quiescent Supply Current ICC VCC = +3V Input Offset Voltage Input Offset Voltage Temperature Coefficient (Note 2) Input Bias Current Input Offset Current Input Resistance Input Common-Mode Voltage VOS VCC = +5V In normal mode In shutdown mode In normal mode In shutdown mode TA = +25C TA = TMIN to TMAX 0.6 1 1 1000 -0.15 82 80 82 78 102 102 dB VCC - 1.2 MIN 2.4 350 0.1 350 0.1 5 TYP MAX 5.5 440 2 440 2 50 600 5.5 500 V A UNITS V
TCVOS IB IOS RIN VCM
VCC = +5V (Note 2) (Note 2) Differential or common mode Guaranteed by the CMRR test VCC = +5V, -0.15V VCM (VCC - 1.2V) VCC = +3.0V; -0.15V VCM (VCC - 1.2V) TA = +25C TA = TMIN to TMAX TA = +25C TA = TMIN to TMAX
V/C pA pA M V
Common-Mode Rejection Ratio
CMRR
4
_______________________________________________________________________________________
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 = 100k to VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25C.) (Note 1)
PARAMETER Power-Supply Rejection Ratio SYMBOL PSRR CONDITIONS VCC = +2.4V to +5.5V TA = +25C TA = TMIN to TMAX RL = 100k, VOUT = 15mV to (VCC - 50mV) RL = 1k, VOUT = 0.15V to (VCC - 0.3V) RL = 100k, VOUT = 15mV to (VCC - 50mV) RL = 1k, VOUT = 0.15V to (VCC - 0.3V) RL = 100k, VOUT = 15mV to (VCC - 50mV) RL = 1k, VOUT = 0.15V to (VCC - 0.3V) RL = 100k, VOUT = 15mV to (VCC - 50mV) RL = 1k, VOUT = 0.15V to (VCC - 0.3V) VCC - VOH VOL - VEE VCC - VOH VOL - VEE MIN 97 95 110 128 TYP 120 dB MAX UNITS
MAX4236/MAX4237
VCC = +5V, RL connected to VCC/2, TA = +25C
100
114
VCC = +5V, RL connected to VCC/2, TA = TMIN to TMAX Large-Signal Voltage Gain AVOL VCC = +3V, RL connected to VCC/2, TA = +25C
110
95 dB 110 128
100
114
VCC = +3V, RL connected to VCC/2, TA = TMIN to TMAX
105
95
VCC = +5V, RL connected to VCC/2, RL = 100k Output Voltage Swing VOUT VCC = +5V, RL connected to VCC/2, RL = 1k Shorted to VEE Output Short-Circuit Current IOUT(SC) Shorted to VCC Gain-Bandwidth Product Slew Rate GBWP SR RL = , CL = 15pF VCC = +5V, VOUT = 4V step
2 3 150 50 10
10 10 mV 250 100
mA 30 MAX4236 MAX4237 MAX4236 MAX4237 1.7 7.5 0.3 1.3 MHz V/s
_______________________________________________________________________________________
5
SOT23, Very High Precision, 3V/5V Rail-To-Rail Op Amps MAX4236/MAX4237
ELECTRICAL CHARACTERISTICS (SOT23-6) (continued)
(VCC = +2.4V to +5.5V, VEE = 0, VCM = 0, VOUT = VCC/2, RL = 100k to VCC/2, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25C.) (Note 1)
PARAMETER Settling Time Total Harmonic Distortion Input Capacitance Input Voltage Noise Density Input Noise Voltage Capacitive Load Stability Shutdown Mode Output Leakage SHDN Logic Low SHDN Logic High SHDN Input Current Shutdown Delay Time Shutdown Recovery Time t(SH) t(EN) SYMBOL tS THD CIN en enp-p CLOAD CONDITIONS VOUT settling to within 0.01% MAX4236 MAX4237 MIN TYP 1 1 0.001 7.5 14 0.2 MAX4236 No sustained oscillations MAX4237 IOUT(SH) VIL VIH SHDN = VEE or VCC RL = 1k RL = 1k 0.7 x VCC 1 1 4 3 Device in shutdown mode (SHDN = VEE) VOUT = 0 to VCC 200 0.01 1.0 0.3 x VCC A V V A s s 200 pF MAX UNITS s % pF nV/Hz Vp-p
f = 5kHz, VOUT = 2Vp-p, VCC = +5V RL = 10k f = 100kHz f = 1kHz f = 0.1Hz to 10Hz
Note 1: All devices are 100% production tested at TA = +25C; all specifications over temperature are guaranteed by design, unless otherwise specified. Note 2: Guaranteed by design, not production tested. Note 3: Maxim specification limits for the temperature coefficient of the offset voltage (TCVOS) are 100% tested for the A-grade, 8pin SO and MAX packages.
Typical Operating Characteristics
(VCC = +5V, VEE = 0, VCM = VCC/2, RL = 100k to VCC/2, TA = +25C, unless otherwise noted.)
VOS DISTRIBUTION
MAX 4236 toc01
TCVOS DISTRIBUTION
MAX4236 toc02
OFFSET VOLTAGE vs. TEMPERATURE
60 OFFSET VOLTAGE (V) 40 20 0 -20 -40 -60
MAX4236 toc02
18 16 PERCENT OF UNITS (%) 14 12 10 8 6 4 2 0 -10 -8 -6 -4 -2 0 2 4 6 8 10 VOS (V) VCC = 5V
25
VCC = 5V
80
20 PERCENT OF UNITS (%)
15
10
5
0 -2.0 -1.5 -1.0 -0.5 0 0.5 1.0 1.5 2.0 TCVOS (V/C)
-80 -50 -25 0 25 75 50 TEMPERATURE (C) 100 125
6
_______________________________________________________________________________________
SOT23, Very High Precision, 3V/5V Rail-To-Rail Op Amps MAX4236/MAX4237
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0, VCM = VCC/2, RL = 100k to VCC/2, TA = +25C, unless otherwise noted.)
COMMON-MODE REJECTION RATIO vs. COMMON-MODE INPUT VOLTAGE
MAX4236 toc04
COMMON-MODE REJECTION RATIO vs. COMMON-MODE INPUT VOLTAGE
COMMON-MODE REJECTION RATIO (dB) COMMON-MODE REJECTION RATIO (dB) VCC = 5V
MAX4236 toc05
COMMON-MODE REJECTION RATIO vs. FREQUENCY (VCC = 5V)
MAX4236 toc06
140 COMMON-MODE REJECTION RATIO (dB) VCC = 3V 120 100 80 60 40 20 0 0 0.5 1.0 1.5 2.0 2.5
140 120 100 80 60 40 20 0
120 100 80 60 40 20 0
3.0
0
1
2
3
4
5
0.01
0.1
COMMON-MODE INPUT VOLTAGE (V)
COMMON-MODE INPUT VOLTAGE (V)
1 10 100 FREQUENCY (kHz)
1000 10,000
COMMON-MODE REJECTION RATIO vs. FREQUENCY (VCC = 3V)
MAX4236 toc07
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY (VCC = 5V)
MAX4236 toc08
140 COMMON-MODE REJECTION RATIO (dB) 120 100
120 100 80 PSSR (dB)
MAX4237 OPEN-LOOP GAIN/PHASE vs. FREQUENCY MAX4236 toc09
140 120 100 GAIN (dB) 80 60 GAIN PHASE
100
80 PHASE (DEGREES)
80 60 40 20 0 0.01 0.1 1 10 100 1000 10,000 FREQUENCY (kHz)
60
60 40 20 0 0.1 1 10 100 1000 10,000 FREQUENCY (kHz)
40 40 20 0 -20 0.001 0.01 0.1 1 10 0 100 1000 10,000 100,000 VCC = 5V/3V CL = 15pF/200pF 20
FREQUENCY (kHz)
MAX4236 OPEN-LOOP GAIN/PHASE vs. FREQUENCY MAX4236 toc10
140 PHASE
INPUT VOLTAGE NOISE vs. FREQUENCY
MAX4236 toc11
VOUT = 2Vp-p 0.1 THD + NOISE (%)
80 GAIN
PHASE (DEGREES)
100
GAIN (dB)
INPUT VOLTAGE NOISE (nVHz)
120
20
80 60
60
15
0.01
40 40 20 0 -20 0.001 0.01 0.1 1 10 0 100 1000 10,000 VCC = 5V/3V CL = 15pF/200pF 20
10
5 0 0.01 0.1 1 FREQUENCY (kHz) 10 100
0.001
0.0001 10 100 1k FREQUENCY (Hz) 10k 100k
FREQUENCY (kHz)
_______________________________________________________________________________________
MAX4236 toc12
100
25
1
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
7
SOT23, Very High Precision, 3V/5V Rail-To-Rail Op Amps MAX4236/MAX4237
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0, VCM = VCC/2, RL = 100k to VCC/2, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
MAX4236 toc13
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4236 toc14
LARGE-SIGNAL GAIN vs. TEMPERATURE
140 VCC = 5V, RL to VEE 120 GAIN (dB) VCC = 5V, RL to VCC RL = 1k
MAX4236 toc15
400 390 380 SUPPLY CURRENT (A) 370 360 350 340 330 320 310 300 -50 -25 0 25 50 75 100 +V = 3V +V = 5V
345 340 SUPPLY CURRENT (A) 335 TA = +85C 330 TA = +125C 325
TA = -40C TA = +25C
100 VCC = 3V, RL to VEE 80 VCC = 3V, RL to VCC
320 315 125 2.5 3.0 3.5 4.0 4.5 5.0 5.5 TEMPERATURE (C) SUPPLY VOLTAGE (V) 60 -50 -25 0 25 50 75 100 125 TEMPERATURE (C)
MINIMUM OUTPUT VOLTAGE vs. TEMPERATURE
MAX4236 toc16
MAXIMUM OUTPUT VOLTAGE vs. TEMPERATURE
MAX4236 toc17
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
180 160 OUTPUT VOLTAGE (mV) 140 120 100 80 60 40 20 VOL - VEE, RL to VEE VCC - VOH, RL to VCC RL = 1k
MAX4236 toc18
50 MINIMUM OUTPUT VOLTAGE (mV) 45 40 35 30 25 20 15 10 5 0 -50 -25 0 25 50 75 100 VCC = 5V/3V, RL = 100k VCC = 3V, RL = 1k VCC = 5V, RL = 1k
200 MAXIMUM OUTPUT VOLTAGE (mV) 180 160 140 120 100 80 60 40 20 0 VCC = 5V/3V, RL = 100k -50 -25 0 25 50 75 100 VCC = 3V, RL = 1k VCC = 5V, RL = 1k
200
0 125 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V)
125
TEMPERATURE (C)
TEMPERATURE (C)
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
MAX4236 toc19
OUTPUT SOURCE CURRENT vs. OUTPUT VOLTAGE
MAX4236 toc20
OUTPUT SOURCE CURRENT vs. OUTPUT VOLTAGE
9 OUTPUT SOURCE CURRENT (mA) 8 7 6 5 4 3 2 1 VCC = 3V
MAX4236 toc21
4.0 3.5 VOL - VEE OUTPUT VOLTAGE (mV) 3.0 2.5 2.0 1.5 1.0 0.5 0 3.0 3.5 4.0 VCC - VOH
RL = 100k
12 VCC = 5V OUTPUT SOURCE CURRENT (mA) 10 8 6 4 2 0
10
0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 OUTPUT VOLTAGE (V) 0 0.5 1.0 1.5 2.0 2.5 3.0 OUTPUT VOLTAGE (V)
4.5
5.0
SUPPLY VOLTAGE (V)
8
_______________________________________________________________________________________
SOT23, Very High Precision, 3V/5V Rail-To-Rail Op Amps MAX4236/MAX4237
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0, VCM = VCC/2, RL = 100k to VCC/2, TA = +25C, unless otherwise noted.)
OUTPUT SINK CURRENT vs. OUTPUT VOLTAGE
MAX4236 toc22
OUTPUT SINK CURRENT vs. OUTPUT VOLTAGE
MAX4236 toc23
SHORT-CIRCUIT CURRENT vs. TEMPERATURE
MAX4236 toc24
80 70 OUTPUT SINK CURRENT (mA) 60 50 40 30 20 10 0 0
VCC = 5V OUTPUT TO GND
60 50 OUTPUT SINK CURRENT (mA) 40 30 20 10 0
VCC = 3V OUTPUT TO GND
20
SHORT-CIRCUIT CURRENT (mA)
15 VCC = 5V 10 VCC = 3V
5 SHORTED TO VEE (SOURCING CURRENT) 0 -50 -25 0 25 50 75 100 125
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 OUTPUT VOLTAGE (V)
0
0.5
1.0
1.5
2.0
2.5
3.0
OUTPUT VOLTAGE (V)
TEMPERATURE (C)
SHORT-CIRCUIT CURRENT vs. TEMPERATURE
MAX4236 toc25
DC I/O TRANSFER CURVE (RLOAD = 100k)
MAX4236 toc26
DC I/O TRANSFER CURVE (RLOAD = 1k)
2.0 1.5 OUTPUT VOLTAGE (V) 1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 -2.5 VSUPPLY = 2.5V
MAX4236 toc27
40 35 SHORT-CIRCUIT CURRENT (mA) 30 25 20 15 10 5 0 -50 -25 0 75 50 TEMPERATURE (C) 25 100 SHORTED TO VCC (SINKING CURRENT) VCC = 5V VCC = 3V
2.5 2.0 1.5 OUTPUT VOLTAGE (V) 1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 -2.5
VSUPPLY = 2.5V
2.5
125
-100
-50
0
50
100
-100
-50
0
50
100
DIFFERENTIAL INPUT VOLTAGE (V)
DIFFERENTIAL INPUT VOLTAGE (V)
MAX4236 NONINVERTING SMALL-SIGNAL RESPONSE
MAX4236 toc28
MAX4237 NONINVERTING SMALL-SIGNAL RESPONSE
MAX4236 toc29
0
INPUT 10mV/div
0
INPUT 10mV/div
0
OUTPUT 10mV/div 1s/div VCC = 2.5V RL = 1k, CL = 15pF AV = 1V/V
0
OUTPUT 50mV/div
1s/div VCC = 2.5V RL = 1k, CL = 15pF AV = 5V/V
_______________________________________________________________________________________
9
SOT23, Very High Precision, 3V/5V Rail-To-Rail Op Amps MAX4236/MAX4237
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0, VCM = VCC/2, RL = 100k to VCC/2, TA = +25C, unless otherwise noted.)
MAX4237 NONINVERTING LARGE-SIGNAL RESPONSE
MAX4236 toc30
MAX4237 NONINVERTING LARGE-SIGNAL RESPONSE
MAX4236 toc31
0
INPUT 200mV/div
0
INPUT 200mV/div
0
OUTPUT 1V/div
0
OUTPUT 1V/div
2s/div VCC = 2.5V RL = 1k, CL = 15pF AV = 5V/V
1s/div VCC = 2.5V RL = 100k, CL = 15pF AV = 5V/V
MAX4236 NONINVERTING LARGE-SIGNAL RESPONSE
MAX4236 toc32
MAX4236 NONINVERTING LARGE-SIGNAL RESPONSE
MAX4236 toc33
INPUT 1V/div 0 0
INPUT 1V/div
OUTPUT 1V/div 0 0
OUTPUT 1V/div
4s/div VCC = 2.5V RL = 1k, CL = 15pF AV = 1V/V
4s/div VCC = 2.5V RL = 100k, CL = 15pF AV = 1V/V
10
______________________________________________________________________________________
SOT23, Very High Precision, 3V/5V Rail-To-Rail Op Amps
Pin Description
PIN SOT23 1 2 3 4 5 6 -- SO/MAX 6 4 3 2 8 7 1, 5 OUT VEE IN+ INSHDN VCC N.C. Amplifier Output Negative Power Supply. Bypass with a 0.1F 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 0.1F capacitor to ground. No Connection. Not internally connected. NAME FUNCTION
MAX4236/MAX4237
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.
The output swings to within 150mV of the power-supply rails with a 1k 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 supply current drops to 0.1A, and the amplifiers are disabled 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 4s.
High Accuracy
The MAX4236/MAX4237 maximum input offset voltage is 20V (5V, typ) for grade A version and 50V for grade B version at +25C. The maximum temperature coefficient of the offset voltage for grade A and B are guaranteed to be 2V/C and 4.5V/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 0.2Vp-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 generating very small outputs.
Applications Information
As described above, the characteristics of the MAX4236/MAX4237 are excellent for high-precision/ accuracy circuitry, and the high impedance, low-current, 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 discharges 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, low11
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).
______________________________________________________________________________________
SOT23, Very High Precision, 3V/5V Rail-To-Rail Op Amps MAX4236/MAX4237
current, low-noise inputs allow a minimum of capacitance to be used. Piezoresistive transducers applications require many of the same qualities. For those applications the MAX4236/MAX4237 high CMRR, PSRR, and offset stability are also a good match. A typical application for a piezoresistive transducer instrumentation amplifier design using the MAX4236/MAX4237 is shown in the Typical Application Circuit. In general, the MAX4236/MAX4237 are good components for any application in which an amplifier with an almost zero input current is required, including highprecision, long time-constant integrators and electrochemical sensors.
PART MAX4236EUT MAX4236AEUA MAX4236BEUA MAX4236AESA MAX4236BESA MAX4237EUT MAX4237AEUA MAX4237BEUA MAX4237AESA MAX4237BESA GRADE -- A B A B -- A B A B
Selector Guide
MINIMUM STABLE GAIN 1 1 1 1 1 5 5 5 5 5 TOP MARK AAUV -- -- -- -- AAUW -- -- -- --
Power Supplies
The MAX4236/MAX4237 can operate from a single +2.4V to +5.5V power supply, or from 1.2V to 2.75V power supplies. The power supply pin(s) must be bypassed to ground with a 0.1F capacitor as close to the pin as possible.
Typical Application Circuit
+VS
Layout and Physical Design
A good layout improves performance by decreasing the amount of parasitic and stray capacitance, inductance and resistance at the amplifier's inputs, outputs, and power-supply connections. Since parasitics might be unavoidable, minimize trace lengths, resistor leads, and place external components as close to the pins as possible. In high impedance, low input current applications, input lines guarding and shielding, special grounding, and other physical design and layout techniques, are mandatory if good results are expected. The negative effects of crosstalk, EMI and other forms of interference and noise (thermal, acoustic, etc.) must be accounted for and prevented beforehand for good performance in the type of sensitive circuitry in which the MAX4236/MAX4237 are likely to be used.
VOUT
MAX4236
-VS +VS LOAD CELL
MAX4236
-VS
Chip Information
TRANSISTOR COUNTS: 224 PROCESS: BiCMOS
12
______________________________________________________________________________________
SOT23, Very High Precision, 3V/5V Rail-To-Rail Op Amps
Package Information
6LSOT.EPS
MAX4236/MAX4237
______________________________________________________________________________________
8LUMAXD.EPS
13
SOT23, Very High Precision, 3V/5V Rail-To-Rail Op Amps MAX4236/MAX4237
Package Information (continued)
SOICN.EPS
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.
14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

▲Up To Search▲

Price & Availability of MAX4237

	To Download MAX4237 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .