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19-1192; Rev 3; 2/98
Single/Dual/Quad, Low-Power, Single-Supply, Rail-to-Rail I/O Op Amps with Shutdown
General Description
The MAX4330-MAX4334 single/dual/quad op amps combine a wide 3MHz bandwidth, low-power operation, and excellent DC accuracy with Rail-to-Rail(R) inputs and outputs. These devices require only 245A per amplifier, and operate from either a single +2.3V to +6.5V supply or dual 1.15V to 3.25V supplies. The input commonmode voltage range extends 250mV beyond VEE and VCC, and the outputs swing rail-to-rail. The MAX4331/ MAX4333 feature a shutdown mode in which the output goes high impedance and the supply current decreases to 9A per amplifier. Low-power operation combined with rail-to-rail input common-mode range and output swing makes these amplifiers ideal for portable/battery-powered equipment and other low-voltage, single-supply applications. Although the minimum operating voltage is specified at 2.3V, these devices typically operate down to 2.0V. Low offset voltage and high speed make these amplifiers excellent choices for signal-conditioning stages in precision, low-voltage data-acquisition systems. The MAX4330 is available in the space-saving 5-pin SOT23 package, and the MAX4331/MAX4333 are offered in a MAX package.
____________________________Features
o 3MHz Gain-Bandwidth Product o 245A Quiescent Current per Amplifier o Available in Space-Saving SOT23-5 Package (MAX4330) o +2.3V to +6.5V Single-Supply Operation o Rail-to-Rail Input Common-Mode Voltage Range o Rail-to-Rail Output Voltage Swing o 250V Offset Voltage o Low-Power, 9A (per amp) Shutdown Mode (MAX4331/MAX4333) o No Phase Reversal for Overdriven Inputs o Capable of Driving 2k Loads o Unity-Gain Stable
MAX4330-MAX4334
Ordering Information
PART MAX4330EUK-T MAX4331ESA MAX4331EUA MAX4332ESA MAX4333ESD MAX4333EUB MAX4334ESD TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C PINPACKAGE 5 SOT23-5 8 SO 8 MAX 8 SO 14 SO 10 MAX 14 SO SOT TOP MARK ABAJ -- -- -- -- -- --
Applications
Portable/Battery-Powered Equipment Data-Acquisition Systems Signal Conditioning Low-Power, Low-Voltage Applications
Selector Guide
PART MAX4330 MAX4331 MAX4332 MAX4333 MAX4334 NO. OF AMPS SHUTDOWN PIN-PACKAGE PER PACKAGE MODE 1 1 2 2 4 -- Yes -- Yes -- 5-pin SOT23 8-pin SO/MAX 8-pin SO 10-pin MAX, 14-pin SO 14-pin SO
IN+ 3 OUT 1
Pin Configurations
TOP VIEW
5
VCC
VEE 2
MAX4330
4
IN-
SOT23-5
Rail-to-Rail is a registered trademark of Nippon Motorola Ltd.
Pin Configurations continued at end of data sheet.
1
________________________________________________________________ Maxim Integrated Products
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Single/Dual/Quad, Low-Power, Single-Supply, Rail-to-Rail I/O Op Amps with Shutdown MAX4330-MAX4334
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC to VEE .....................................................7V IN_+, IN_-, SHDN Voltage................(VEE - 0.3V) to (VCC + 0.3V) Output Short-Circuit Duration.................................... Continuous (short to either supply) Continuous Power Dissipation (TA = +70C) 5-Pin SOT23 (derate 7.1mW/C above +70C).............571mW 8-Pin SO (derate 5.88mW/C above +70C).................471mW 8-Pin MAX (derate 4.10mW/C above +70C) ............330mW 10-Pin MAX (derate 5.60mW/C above +70C) ..........444mW 14-Pin SO (derate 8.33mW/C above +70C)...............667mW Operating Temperature Ranges MAX433_C/D .......................................................0C to +70C MAX433_E_ _....................................................-40C to +85C Maximum Junction Temperature .....................................+150C Storage Temperature Range .............................-65C to +160C Lead Temperature (soldering, 10sec) .............................+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.
DC ELECTRICAL CHARACTERISTICS
(VCC = +2.3V to +6.5V, VEE = 0V, VCM = 0V, VOUT = (VCC / 2), RL tied to (VCC / 2), V S HDN 2V, TA = +25C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MAX433_EUA/EUB MAX4330EUK Input Offset Voltage VOS VCM = VEE to VCC MAX4331ESA MAX4332ESA/MAX4333ESD MAX4334ESD Input Bias Current Input Offset Current Differential Input Resistance Common-Mode Input Voltage Range IB IOS RIN(DIFF) VCM MAX433_EUA/EUB MAX4330EUK VCC = 5V -0.25V < VCM < (VCC + 0.25V) VCC = 2.3V MAX4331ESA MAX4332ESA/ MAX4333ESD MAX4334ESD MAX433_EUA/EUB MAX4330EUK MAX4331ESA MAX4332ESA/ MAX4333ESD MAX4334ESD MAX433_EUA/EUB MAX4330EUK Power-Supply Rejection Ratio PSSR VCC = 2.3V to 6.5V MAX4331ESA MAX4332ESA/ MAX4333ESD MAX4334ESD Output Resistance Off-Leakage Current in Shutdown 2 ROUT IOUT(SHDN) AV = 1 V S HDN < 0.8V, VOUT = 0V to VCC VEE < VCM < VCC VEE < VCM < VCC MIN TYP 0.65 0.65 0.25 0.25 0.25 25 1 2.3 2 -0.25 68 67 74 71 69 65 64 71 69 66 76 76 79 77 75 88 87 93 93 92 84 82 90 90 89 88 88 92 90 90 0.1 0.1 2 A dB dB dB VCC + 0.25 MAX 1.5 1.5 0.6 0.9 1.0 65 12 nA nA M k V mV UNITS
| VIN+ - VIN- | < 1.4V | VIN+ - VIN- | > 2.5V
Common-Mode Rejection Ratio
CMRR
_______________________________________________________________________________________
Single/Dual/Quad, Low-Power, Single-Supply, Rail-to-Rail I/O Op Amps with Shutdown
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +2.3V to +6.5V, VEE = 0V, VCM = 0V, VOUT = (VCC / 2), RL tied to (VCC / 2), V S HDN 2V, TA = +25C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS VOUT = 0.2V to 2.1V, RL = 100k VCC = 2.3V VOUT = 0.35V to 1.95V, RL = 2k VOUT = 0.2V to 4.8V, RL = 100k VCC = 5V VOUT = 0.35V to 4.65V, RL = 2k VCC - VOH RL = 100k VOL VCC - VOH RL = 2k VOL Low (shutdown mode) High (normal mode) VEE < V S HDN < VCC VCC ICC ICC(SHDN) VCM = VOUT = VCC / 2 V S HDN < 0.8V VCC = 5V VCC = 2.3V VCC = 5V VCC = 2.3V 2.3 275 245 17 9 MIN 93 78 93 83 TYP 112 90 120 95 8 8 100 70 20 0.8 2.0 2 6.5 325 290 25 14 MAX UNITS
MAX4330-MAX4334
Large-Signal Voltage Gain
AVOL
dB
Output Voltage Swing
VOUT
30 30 175 150
mA mV
Output Short-Circuit Current SHDN Logic Threshold (Note 1) SHDN Input Current Operating Supply-Voltage Range Quiescent Supply Current per Amplifier Shutdown Supply Current per Amplifier
ISC VIL VIH
mA V A V A A
DC ELECTRICAL CHARACTERISTICS
(VCC = +2.3V to +6.5V, VEE = 0V, VCM = 0V, VOUT = (VCC / 2), RL tied to (VCC / 2), V S HDN 2V, TA = -40C to +85C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MAX433_EUA MAX433_EUK/EUB MAX4331ESA MAX4332ESA/MAX4333ESD MAX4334ESD Offset-Voltage Tempco Input Bias Current Input Offset Current VOS/T IB IOS VEE < VCM < VCC VEE < VCM < VCC MAX433_EUA MAX433_EUK/EUB MAX4331ESA MAX4332ESA/ MAX4333ESD MAX4334ESD Common-Mode Input Voltage Range VCM 72 71 76 73 71 -0.15 VCC + 0.15 V 3 115 15 MIN TYP MAX 3.2 3.8 0.7 1 1 V/C nA nA UNITS
Input Offset Voltage
VOS
VCM = VEE to VCC
mV
Power-Supply Rejection Ratio
PSRR
VCC = 2.3V to 6.5V
dB
_______________________________________________________________________________________
3
Single/Dual/Quad, Low-Power, Single-Supply, Rail-to-Rail I/O Op Amps with Shutdown MAX4330-MAX4334
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +2.3V to +6.5V, VEE = 0V, VCM = 0V, VOUT = (VCC / 2), RL tied to (VCC / 2), V S HDN 2V, TA = -40C to +85C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MAX433_EUA/EUB MAX4330EUK VCC = 5V -0.25V < VCM < (VCC + 0.25V) VCC = 2.3V MAX4331ESA MAX4332ESA/ MAX4333ESD MAX4334ESD MAX433_EUA/EUB MAX4330EUK MAX4331ESA MAX4332ESA/ MAX4333ESD MAX4334ESD Off-Leakage Current in Shutdown IOUT(SHDN) V SHDN < 0.8V, VOUT = 0V to VCC VOUT = 0.2V to 2.1V, RL = 100k VOUT = 0.35V to 1.95V, RL = 2k VOUT = 0.2V to 4.8V, RL = 100k VOUT = 0.35V to 4.65V, RL = 2k VCC - VOH VOL VCC - VOH VOL 2.0 2 2.3 VCC = 5V VCC = 2.3V VCC = 5V VCC = 2.3V 6.5 350 330 30 17 90 70 90 74 40 40 200 180 0.8 V A V A A mV dB MIN 63 62 72 69 67 58 57 68 66 65 5 A dB TYP MAX UNITS
Common-Mode Rejection Ratio
CMRR
VCC = 2.3V Large-Signal Voltage Gain AVOL VCC = 5V
RL = 100k Output Voltage Swing VOUT RL = 2k SHDN Logic Threshold (Note 1) SHDN Input Current Operating Supply-Voltage Range Quiescent Supply Current per Amplifier Shutdown Supply Current per Amplifier VCC ICC ICC(SHDN) VIL VIH
Low (shutdown mode) High (normal mode) VEE < V S HDN < VCC TA = -40C to +85C VCM = VOUT = VCC / 2 V S HDN < 0.8V
Note 1: SHDN logic thresholds are referenced to VEE. Note 2: The MAX4330EUK is 100% tested at TA = +25C. All temperature limits are guaranteed by design.
4
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Single/Dual/Quad, Low-Power, Single-Supply, Rail-to-Rail I/O Op Amps with Shutdown
AC ELECTRICAL CHARACTERISTICS
(VCC = +5V, VEE = 0V, VCM = 0V, VOUT = (VCC / 2), RL = 10k to (VCC / 2), V S HDN 2V, CL = 15pF, TA = +25C, unless otherwise noted.) PARAMETER Gain-Bandwidth Product Full-Power Bandwidth Slew Rate Phase Margin Gain Margin Total Harmonic Distortion Settling Time to 0.01% Input Capacitance Input Noise Voltage Density Input Current Noise Density Crosstalk Capacitive Load Stability Shutdown Time Enable Time from Shutdown Power-Up Time t S HDN tENABLE tON SYMBOL GBWP FPBW SR PM GM THD tS CIN VNOISE INOISE f = 10kHz f = 10kHz f = 10kHz, MAX4332/MAX4333/MAX4334 AV = 1, no sustained oscillations f = 10kHz, VOUT = 2Vp-p, AVCL = +1V/V AV = +1V/V, 2V step VOUT = 4Vp-p CONDITIONS MIN TYP 3 190 1.5 55 10 0.012 4 3 28 0.26 -124 150 0.8 1 5 MAX UNITS MHz kHz V/s degrees dB % s pF nV/Hz pA/Hz dB pF s s s
MAX4330-MAX4334
__________________________________________Typical Operating Characteristics
(VCC = +5V, VEE = 0V, VCM = VCC / 2, V S HDN > 2V, TA = +25C, unless otherwise noted.)
GAIN AND PHASE vs. FREQUENCY (NO LOAD)
60 50 40 GAIN (dB) 30 20 10 0 -10 -20 100 1k 10k 100k 1M 10M PHASE GAIN 45 0 -45 -90 -20 -135 -180 100M -40 100
MAX4330/34-TOC01
GAIN AND PHASE vs. FREQUENCY (CL = 150pF)
180 135 90 PHASE (DEGREES) GAIN (dB) 40 GAIN 60
MAX4330/34-TOC02
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
144 108 PHASE (DEGREES) 72 36 0 -20 AV = +1
MAX4330/34-TOC03
180
0
AV = +1000
AV = +1000
PSRR (dB)
20
-40
0
PHASE
-36 -72
-60
-108 -144 1k 10k 100k 1M 10M -180 100M
-80
-100 10
100
1k
10k
100k
1M 10M 100M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
_______________________________________________________________________________________
5
Single/Dual/Quad, Low-Power, Single-Supply, Rail-to-Rail I/O Op Amps with Shutdown MAX4330-MAX4334
____________________________Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0V, VCM = VCC / 2, V S HDN > 2V, TA = +25C, unless otherwise noted.)
OUTPUT IMPEDANCE vs. FREQUENCY
MAX4330/34-TOC04
AV = +1 OUTPUT IMPEDANCE () 100
330 310 290 ICC (A) VCC = 6.5V
SHDN = 0V 20 ICC (A) VCC = 6.5V
10
270 250 230 210 VCC = 2.3V
15 VCC = 2.3V 10
1
0.1
190 170
0.01 100 1k 10k 100k 1M FREQUENCY (Hz) 10M 100M
150 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
5 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
OUTPUT LEAKAGE CURRENT vs. TEMPERATURE
MAX4330/34-TOC07
MAX4330/34-TOC07a
OUTPUT LEAKAGE CURRENT (pA)
1000 800 600 400 200 0 -200
INPUT OFFSET VOLTAGE (V)
INPUT BIAS CURRENT (nA)
AV = OPEN LOOP SHDN = 0V OUT SHORT VCC = 6.5V TO VEE VCC = 2.3V
SOT/MAX PACKAGES 1000 500 0 -500 SO PACKAGE -1000 -1500
30 VCC = 2.3V 20 10 0 -10 -20 -30
VCC = 6.5V
OUT SHORT TO VCC
VCC = 2.3V TO 6.5V
-60 -40 -20
0
20
40
60
80
100
-60 -40 -20
TEMPERATURE (C)
0 20 40 60 TEMPERATURE (C)
80
100
0
1
2
3
4
5
6
7
COMMON-MODE VOLTAGE (V)
INPUT BIAS CURRENT vs. TEMPERATURE
MAX4330-34 TOC8a
OUTPUT SWING HIGH vs. TEMPERATURE
RL TO VEE 200 VCC - VOUT (mV) VCC = 6.5V, RL = 2k
MAX4330/34-TOC09
OUTPUT SWING LOW vs. TEMPERATURE
RL TO VCC 100 VOUT - VEE (mV) 80 60 40 20 0 VCC = 2.3V RL = 100k VCC = 2.3V RL = 2k VCC = 6.5V RL = 2k
MAX4330/34-TOC12
50 40 INPUT BIAS CURRENT (nA) 30 20 10 0 -10 -20 -30 -40 -40 VCC = 6.5V, VCM = VEE -20 0 20 40 60 80 VCC = 2.3V, VCM = VEE VCC = 2.7V, VCM = VCC VCC = 6.5V, VCM = VCC
250
120
150 VCC = 2.3V, RL = 2k 100 VCC = 2.3V, RL = 100k 50 VCC = 6.5V, RL = 100k
VCC = 6.5V RL = 100k
0 100 -60 -40 -20 0 20 40 60 TEMPERATURE (C) 80 100
-60 -40
-20
0
20
40
60
80
100
TEMPERATURE (C)
TEMPERATURE (C)
6
_______________________________________________________________________________________
MAX4330-34/TOC08
1200
INPUT OFFSET VOLTAGE vs. TEMPERATURE
1500
INPUT BIAS CURRENT vs. COMMON-MODE VOLTAGE
40
MAX4330/34-TOC06
MAX4330/34-TOC05
1k
SUPPLY CURRENT vs. TEMPERATURE
350 25
SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE
Single/Dual/Quad, Low-Power, Single-Supply, Rail-to-Rail I/O Op Amps with Shutdown MAX4330-MAX4334
____________________________Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0V, VCM = VCC / 2, V S HDN > 2V, TA = +25C, unless otherwise noted.)
LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE (VCC = 2.3V, RL TO VCC)
RL = 100k
MAX4330/34-TOC13
COMMON-MODE REJECTION vs. TEMPERATURE
MAX4330/34-TOC11
LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE (VCC = 2.3V, RL TO VEE)
114 110 GAIN (dB) 106 102 98 RL = 2k RL = 10k RL = 100k
MAX4330/34-TOC10
-60 COMMON-MODE REJECTION (dB) -70 -80
118 113 108 GAIN (dB) 103 98 93 88 83 78
118
-90 -100 -110 -120 -130 -140 -60 -40 -20 0 20 40 60 TEMPERATURE (C) 80 100 VCM = -0.25V TO +5.25V
RL = 10k
RL = 2k
94 90 86
0
0.1
0.2
0.3
0.4
0.5
0.6
0
0.1
0.2
0.3
0.4
0.5
0.6
OUTPUT VOLTAGE: EITHER SUPPLY (V)
OUTPUT VOLTAGE: EITHER SUPPLY (V)
LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE (VCC = 6.5V, RL TO VCC)
MAX4330/34-TOC16
LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE (VCC = 6.5V, RL TO VEE)
MAX4330/34-TOC15
130 120 GAIN (dB)
125 RL = 100k 120 GAIN (dB) 115 110 105 RL = 2k RL = 10k
VOUT(p-p) = VCC - 1V 110 VCC = 6.5V 105 GAIN (dB) 100 VCC = 2.3V 95 90 RL TO VCC 85 RL TO VEE RL TO VCC RL TO VEE
RL = 100k
110 100 90 80 0 0.1 0.2
RL = 10k
RL = 2k
100 95 90
0.3
0.4
0.5
0.6
0
0.1
0.2
0.3
0.4
0.5
0.6
-60 -40 -20
OUTPUT VOLTAGE: EITHER SUPPLY (V)
OUTPUT VOLTAGE: EITHER SUPPLY (V)
0 20 40 60 TEMPERATURE (C)
80
100
MAX4330/34-TOC17
VCC = 6.5V RL TO VEE VCC = 6.5V RL TO VCC
VOUT(p-p) = VCC - 1V
MAX4330/34-TOC18
1.95 1.90 1.85 VCC (V) 1.80 1.75
125 GAIN (dB)
THD + NOISE (%)
AV = +1 2Vp-p SIGNAL 500kHz LOWPASS FILTER RL = 10k TO VCC / 2 0.1
120
0.01
115
VCC = 2.3V RL TO VCC OR VEE
1.70 1.65
110 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
1.60 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (C)
0.001 1 10 100 1k 10k 100k FREQUENCY (Hz)
_______________________________________________________________________________________
7
MAX4330/34-TOC19
130
LARGE-SIGNAL GAIN vs. TEMPERATURE (RL = 100k)
2.00
MINIMUM OPERATING VOLTAGE vs. TEMPERATURE
1
TOTAL HARMONIC DISTORTION AND NOISE vs. FREQUENCY
MAX4330/34-TOC14
140
130
115
LARGE-SIGNAL GAIN vs. TEMPERATURE (RL = 2k)
Single/Dual/Quad, Low-Power, Single-Supply, Rail-to-Rail I/O Op Amps with Shutdown MAX4330-MAX4334
____________________________Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0V, VCM = VCC / 2, V S HDN > 2V, TA = +25C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION AND NOISE vs. PEAK-TO-PEAK SIGNAL AMPLITUDE
AV = +1 1kHz SINE WAVE 500kHz LOWPASS FILTER RL TO VCC / 2 0.1 RL = 2k RL = 10k 0.01 RL = 100k
MAX4330/34-TOC20
CROSSTALK vs. FREQUENCY
MAX4330/34-TOC22
CAPACITIVE LOAD STABILITY
MAX4330/34-TOC21
1
140 130 CROSSTALK (dB) 120 110 100 90 80
10
8 LOAD RESISTANCE (k) UNSTABLE REGION
THD + NOISE (%)
6
4
2
RL TO VEE VOUT = VCC / 2 0 200 600 400 800 LOAD CAPACITANCE (pF) 1000
0.001 4.0 4.2 4.4 4.6 4.8 5.0 PEAK-TO-PEAK SIGNAL AMPLITUDE (V)
0 1 10 100 FREQUENCY (kHz) 1000 10000
SMALL-SIGNAL TRANSIENT RESPONSE (NONINVERTING)
MAX4330/34-TOC22
SMALL-SIGNAL TRANSIENT RESPONSE (INVERTING)
MAX4330/34-TOC23
AV = +1 IN
AV = -1 IN VOLTAGE (50mV/div)
VOLTAGE (50mV/div)
OUT
OUT
TIME (200ns/div)
TIME (200ns/div)
LARGE-SIGNAL TRANSIENT RESPONSE (NONINVERTING)
MAX4330/34-TOC24
LARGE-SIGNAL TRANSIENT RESPONSE (INVERTING)
MAX4330/34-TOC25
IN VOLTAGE (2V/div) VOLTAGE (2V/div)
IN
OUT
OUT
TIME (5s/div)
TIME (5s/div)
8
_______________________________________________________________________________________
Single/Dual/Quad, Low-Power, Single-Supply, Rail-to-Rail I/O Op Amps with Shutdown
Pin Description
PIN MAX4330 1 2 3 4 5 -- -- -- -- MAX4331 6 4 3 2 7 1, 5 -- -- -- MAX4332 -- 4 -- -- 8 -- 1, 7 3, 5 2, 6 MAX4333 10-Pin 14-Pin SO MAX -- -- 4 -- -- 10 -- 1, 9 3, 7 2, 8 4 -- -- 14 5, 7, 8, 10 1, 13 3, 11 2, 12 MAX4334 -- 11 -- -- 4 -- 1, 7 3, 5 2, 6 NAME FUNCTION
MAX4330-MAX4334
OUT VEE IN+ INVCC N.C. OUT1, OUT2 IN1+, IN2+ IN1-, IN2-
Output Negative Supply. Ground for singlesupply operation. Noninverting Input Inverting Input Positive Supply No Connection. Not internally connected. Outputs for Amplifiers 1 and 2 Noninverting Inputs to Amplifiers 1 and 2 Inverting Inputs to Amplifiers 1 and 2 Shutdown Input for Amplifier. Drive low for shutdown mode. Drive high or connect to VCC for normal operation. Shutdown for Amplifiers 1 and 2. Drive low for shutdown mode. Drive high or connect to VCC for normal operation. Outputs for Amplifiers 3 and 4 Inverting Inputs for Amplifiers 3 and 4 Noninverting Inputs for Amplifiers 3 and 4
--
8
--
--
--
--
SHDN
--
--
--
5, 6
6, 9
--
SHDN1, SHDN2 OUT3, OUT4 IN3-, IN4IN3+, IN4+
-- -- --
-- -- --
-- -- --
-- -- --
-- -- --
8, 14 9, 13 10, 12
_______________________________________________________________________________________
9
Single/Dual/Quad, Low-Power, Single-Supply, Rail-to-Rail I/O Op Amps with Shutdown MAX4330-MAX4334
_______________Detailed Description
Rail-to-Rail Input Stage
The MAX4330-MAX4334 have rail-to-rail input and output stages that are specifically designed for lowvoltage, single-supply operation. The input stage consists of separate NPN and PNP differential stages, which operate together to provide a common-mode range extending to 0.25V beyond both supply rails. The crossover region, which occurs halfway between VCC and VEE, is extended to minimize degradation in CMRR caused by mismatched input pairs. The input offset voltage is typically 250V. Low offset voltage, high bandwidth, rail-to-rail common-mode input range, and rail-to-rail outputs make this family of op amps an excellent choice for precision, low-voltage data-acquisition systems. Since the input stage consists of NPN and PNP pairs, the input bias current changes polarity as the input voltage passes through the crossover region. Match the effective impedance seen by each input to reduce the offset error due to input bias currents flowing through external source impedances (Figures 1a and 1b). The combination of high source impedance with input capacitance (amplifier input capacitance plus stray capacitance) creates a parasitic pole that produces an underdamped signal response. Reducing input capacitance or placing a small capacitor across the feedback resistor improves response. The MAX4330-MAX4334's inputs are protected from large differential input voltages by internal 1k series resistors and back-to-back triple diode stacks across the inputs (Figure 2). For differential input voltages (much less than 1.8V), input resistance is typically 2.3M. For differential input voltages greater than 1.8V, input resistance is around 2k, and the input bias current can be approximated by the following equation: IBIAS = (VDIFF - 1.8V) / 2k In the region where the differential input voltage approaches 1.8V, input resistance decreases exponentially from 2.3M to 2k as the diode block begins conducting. Inversely, the bias current increases with the same curve.
MAX4330 MAX4331 MAX4332 MAX4333 MAX4334
R3
R3 = R1
R2
R1
R2
Figure 1a. Reducing Offset Error Due to Bias Current (Noninverting)
R3
MAX4330 MAX4331 MAX4332 MAX4333 MAX4334
R3 = R1
R2
R1
R2
Figure 1b. Reducing Offset Error Due to Bias Current (Inverting)
10
______________________________________________________________________________________
Single/Dual/Quad, Low-Power, Single-Supply, Rail-to-Rail I/O Op Amps with Shutdown MAX4330-MAX4334
1k
1k
Figure 2. Input Protection Circuit
RISO = 0, AV = +1 CL = 510pF IN IN 1V/div 50mV/div
OUT OUT 1V/div
50mV/div
20s/div VCC = 3V, RL = 2k TO VCC / 2
2s/div VCC = 3V, RL = 100k
Figure 3. Rail-to-Rail Input/Output Voltage Range
Figure 4. Small-Signal Transient Response with Excessive Capacitive Load
Rail-to-Rail Output Stage
The MAX4330-MAX4334 output stage can drive up to a 2k load and still typically swing within 125mV of the rails. Figure 3 shows the output voltage swing of a MAX4331 configured as a unity-gain buffer. The operating voltage is a single +3V supply, and the input voltage is 3Vp-p. The output swings to within 70mV of VEE and 100mV of V CC , even with the maximum load applied (2k to mid-supply).
Driving a capacitive load can cause instability in many op amps, especially those with low quiescent current. The MAX4330-MAX4334 are stable for capacitive loads up to 150pF. The Capacitive Load Stability graph in the Typical Operating Characteristics gives the stable operating region for capacitive vs. resistive loads. Figures 4 and 5 show the response of the MAX4331 with an excessive capacitive load, compared with the response when a series resistor is added between the output and the capacitive load. The resistor improves the circuit's response by isolating the load capacitance from the op amp's output (Figure 6).
11
______________________________________________________________________________________
Single/Dual/Quad, Low-Power, Single-Supply, Rail-to-Rail I/O Op Amps with Shutdown MAX4330-MAX4334
AV = +1, CL = 510pF RISO = 39 IN 50mV/div RISO
OUT
50mV/div
CL
2s/div
MAX4330 MAX4331 MAX4332 MAX4333 MAX4334
Figure 5. Small-Signal Transient Response with Excessive Capacitive Load and Isolation Resistor
Figure 6. Capacitive-Load-Driving Circuit
VCC 0V TO +2.7V STEP FOR POWER-UP TEST, +2.7V STEP FOR SHUTDOWN- 2k ENABLE TEST SHDN
MAX4330 MAX4331 MAX4332 MAX4333 MAX4334
VOUT 0V TO +2.7V STEP FOR SHUTDOWN TEST 10k SUPPLY-CURRENT MONITORING POINT
VCC
1V/div
OUT
500mV/div
2k
100
5s/div
Figure 7. Power-Up/Shutdown Test Circuit
Figure 8. Power-Up/Down Output Voltage
__________Applications Information
Power-Up
The MAX4330-MAX4334 outputs typically settle within 5s after power-up. Using the test circuit of Figure 7, Figures 8 and 9 show the output voltage and supply current on power-up and power-down.
Shutdown Mode
The MAX4331/MAX4333 feature a low-power shutdown mode. When the shutdown pin (SHDN) is pulled low, the supply current drops to 9A per amplifier (typical), the amplifier is disabled, and the outputs enter a highimpedance state. Pulling SHDN high or leaving it floating enables the amplifier. Figures 10 and 11 show the MAX4331/MAX4333's output voltage and supply-current responses to a shutdown pulse.
12
______________________________________________________________________________________
Single/Dual/Quad, Low-Power, Single-Supply, Rail-to-Rail I/O Op Amps with Shutdown MAX4330-MAX4334
VCC
1V/div
SHDN
1V/div
ICC
100A/div
OUT
500mV/div
5s/div
5s/div
Figure 9. Power-Up/Down Supply Current
Figure 10. Shutdown Output Voltage Enable/Disable
Do not three-state SHDN. Due to the output leakage currents of three-state devices and the small internal pull-up current for SHDN, three-stating this pin could result in indeterminate logic levels, and could adversely affect op-amp operation. The logic threshold for SHDN is always referred to VEE, not GND. When using dual supplies, pull SHDN to VEE to place the op amp in shutdown mode.
SHDN
1V/div
Power Supplies and Layout
The MAX4330-MAX4334 operate from a single +2.3V to +6.5V power supply, or from dual 1.15V to 3.25V supplies. For single-supply operation, bypass the power supply with a 0.1F capacitor to ground (VEE). For dual supplies, bypass both VCC and VEE with their own set of capacitors to ground. Good layout technique helps optimize performance by decreasing the amount of stray capacitance at the op amp's inputs and outputs. To decrease stray capacitance, minimize trace lengths by placing external components close to the op amp's pins.
ICC 100A/div
5s/div
Figure 11. Shutdown Enable/Disable Supply Current
______________________________________________________________________________________
13
Single/Dual/Quad, Low-Power, Single-Supply, Rail-to-Rail I/O Op Amps with Shutdown MAX4330-MAX4334
Pin Configurations (continued)
TOP VIEW
N.C. ININ+ VEE
1 2
8 7
SHDN VCC OUT N.C.
OUT1 IN1IN1+ VEE
1 2
8 7
VCC OUT2 IN2IN2+
MAX4331
3 4 6 5
MAX4332
3 4 6 5
SO/MAX
SO
OUT1 IN1IN1+ VEE SHDN1
1 2 3 4 5
10 VCC 9 OUT2 IN2IN2+ SHDN2
MAX4333
8 7 6
MAX
OUT1 IN1IN1+ VEE N.C. SHDN1 N.C.
1 2 3 4 5 6 7
14 VCC 13 OUT2 12 IN2-
OUT1 IN1IN1+ VCC IN2+ IN2OUT2
1 2 3 4 5 6 7
14 OUT4 13 IN412 IN4+
MAX4333
11 IN2+ 10 N.C. 9 SHDN2 8 N.C.
MAX4334
11 VEE 10 IN3+ 9 8 IN3OUT3
SO
SO
14
______________________________________________________________________________________
Single/Dual/Quad, Low-Power, Single-Supply, Rail-to-Rail I/O Op Amps with Shutdown
Chip Information
MAX4330/MAX4331 TRANSISTOR COUNT: 199 SUBSTRATE CONNECTED TO VEE MAX4332/MAX4333 TRANSISTOR COUNT: 398 SUBSTRATE CONNECTED TO VEE MAX4334 TRANSISTOR COUNT: 796 SUBSTRATE CONNECTED TO VEE
MAX4330-MAX4334
Tape-and-Reel Information
E D P0 P2 W B0
F
D1
t
NOTE: DIMENSIONS ARE IN MM. AND FOLLOW EIA481-1 STANDARD.
P A0
K0
A0 B0 D D1
3.200 3.099 1.499 0.991
0.102 0.102 +0.102 +0.000 +0.254 +0.000
E F K0 P
1.753 3.505 1.397 3.988
0.102 0.051 0.102 0.102
P0 P010 P2 t W
3.988 40.005 2.007 0.254 8.001
0.102 0.203 0.051 0.127 +0.305 -0.102
5 SOT23-5
______________________________________________________________________________________
15
Single/Dual/Quad, Low-Power, Single-Supply, Rail-to-Rail I/O Op Amps with Shutdown MAX4330-MAX4334
________________________________________________________Package Information
SOT5L.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.
16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
8LUMAXD.EPS

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