View MAX4321_491719.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

19-1649; Rev 0; 4/00
Low-Cost, Low-Voltage, Rail-to-Rail, Input/Output, SOT23 5MHz Op Amp
General Description
The MAX4321 operational amplifier (op amp) combines a 5MHz gain-bandwidth product and excellent DC accuracy with Rail-to-Rail(R) operation at both the inputs and the output. This device requires only 650A and operates from either a single +2.4V to +6.5V supply or dual 1.2V to 3.25V supplies, although the MAX4321 typically operates down to +1.8V (0.9V). The MAX4321 remains unity-gain stable with capacitive loads up to 500pF and is capable of driving 250 loads to within 200mV of either rail. With rail-to-rail input common-mode range and output swing, the MAX4321 is ideal for low-voltage, single-supply applications. In addition, low 1.2mV input offset voltage and high 2V/s slew rate make this device ideal for signal-conditioning stages for precision, low-voltage dataacquisition systems. The MAX4321 comes in a spacesaving 5-pin SOT23 package and is guaranteed over the extended (-40C to +85C) temperature range. The MAX4321 is a low-voltage, pin-for-pin compatible upgrade for the LMC7101 that offers five-times higher bandwidth, two-times faster slew rate, and about half the input voltage noise density.
Features
o Low-Voltage, Pin-for-Pin Upgrade for LMC7101 o Guaranteed +2.4V to +6.5V Single-Supply Operation o Typically Operates Down to +1.8V o 5MHz Gain-Bandwidth Product o 650A Quiescent Current o Rail-to-Rail Common-Mode Input Voltage Range o Rail-to-Rail Output Voltage Range o Drives 250 Loads o Unity-Gain Stable for Capacitive Loads up to 500pF o No Phase Reversal for Overdriven Inputs o Low-Cost Solution in SOT23-5 Package
MAX4321
________________________Applications
Battery-Powered Instruments Portable Equipment Data-Acquisition Systems Sensor and Signal Conditioning Low-Power, Low-Voltage Applications General-Purpose Low-Voltage Applications
PART MAX4321EUK-T
Ordering Information
TEMP. RANGE -40C to +85C PINPACKAGE 5 SOT23-5 TOP MARK ADOA
Typical Operating Circuit
+5V
Pin Configuration/ Functional Diagram
TOP VIEW
MAX187 3 6 SERIAL INTERFACE 8 7 SHDN DOUT SCLK CS VDD AIN VREF GND 1 2 MAX4321 4 5
OUT
1
5
VEE
VCC 2
IN+ 3
4
IN-
MAX4321 SOT23
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. ________________________________________________________________ Maxim Integrated Products 1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
Low-Cost, Low-Voltage, Rail-to-Rail, Input/Output, SOT23 5MHz Op Amp MAX4321
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC to VEE) ....................................-0.3V to +7V All Other Pins ..................................(VEE - 0.3V) to (VCC + 0.3V) Output Short-Circuit Duration.....................................Continuous (short to either supply) Continuous Power Dissipation 5-pin SOT23 (derate 7.1mW/C above +70C)...........571mW 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.
DC ELECTRICAL CHARACTERISTICS
(VCC = +5.0V, VEE = 0, VCM = 0, VOUT = VCC/2, RL = connected to VCC/2, TA = +25C, unless otherwise noted.)
PARAMETER Supply Voltage Range Supply Current Input Offset Voltage Input Bias Current Input Offset Current Differential Input Resistance Common-Mode Input Voltage Range Common-Mode Rejection Ratio Power-Supply Rejection Ratio Output Resistance Large-Signal Voltage Gain
SYMBOL VCC - VEE
CONDITIONS VCC = +2.4V VCC = +6.5V
MIN 2.4
TYP 650 725 1.2 50 4 500
MAX 6.5
UNITS V A
VCM = VOUT = VCC/2 VOS IBIAS IOFFSET RIN VCM CMRR PSRR ROUT AV VCM = VEE or VCC VCM = VEE or VCC VCM = VEE or VCC -1.5V < VDIFF <+1.5V
3.5 150 25
mV nA nA k
Inferred from CMRR test VEE VCM VCC 2.4V < VCC < 6.5V AV = +1V/V VOUT = 0.25V to 4.75V, R = 100k L VOUT = 0.40V to 4.60V, R = 600 L VOUT = 0.40V to 4.60V, R = 250 L RL = 100k VCC - VOH VOL - VEE VCC - VOH VOL - VEE VCC - VOH VOL - VEE
VEE 60 66 91 100 0.1 103 100 70 86 25 20 135 60 200 100 50
VCC
V dB dB dB
Output Voltage Swing
VOUT
RL = 600 RL = 250
mV 300 200 mA
Output Short-Circuit Current
2
_______________________________________________________________________________________
Low-Cost, Low-Voltage, Rail-to-Rail, Input/Output, SOT23 5MHz Op Amp
DC ELECTRICAL CHARACTERISTICS
(VCC = +5.0V, VEE = 0, VCM = 0, VOUT = VCC/2, RL = connected to VCC/2, TA = -40C to +85C, unless otherwise noted.) (Note 1)
MAX4321
PARAMETER Supply Voltage Range Supply Current Input Offset Voltage Input Offset Voltage Temperature Coefficient Input Bias Current Input Offset Current Common-Mode Input Voltage Range Common-Mode Rejection Ratio Power-Supply Rejection Ratio Large-Signal Voltage Gain Output Voltage Swing
SYMBOL VCC - VEE ICC VOS
CONDITIONS VCM = VOUT = VCC/2 VCM = VEE or VCC
MIN 2.4
TYP
MAX 6.5 1200 6
UNITS V A mV V/C
2 IBIAS IOFFSET VCM CMRR PSRR AV VOUT VCM = VEE or VCC VCM = VEE or VCC Inferred from CMRR test VEE VCM VCC 2.4V < VCC < 6.5V VOUT = 0.40V to 4.60V, RL = 250 R = 250 VCC - VOH VOL - VEE VEE 54 62 66 350 250 180 50 VCC
nA nA V dB dB dB mV
AC ELECTRICAL CHARACTERISTICS
(VCC = +5.0V, VEE = 0, VCM = 0, VOUT = VCC/2, RL = 250 connected to VCC/2, TA = +25C, unless otherwise noted.)
PARAMETER Gain-Bandwidth Product Phase Margin Gain Margin Total Harmonic Distortion and Noise Slew Rate Settling Time to 0.01% Turn-On Time Input Capacitance Input Noise Voltage Density Input Noise Current Density
SYMBOL GBP
CONDITIONS
MIN
TYP 5 64 12
MAX
UNITS MHz degrees dB % V/s s s pF nV/ Hz pA/Hz
THD+N SR tSETTLE tON CIN
10kHz tone, VOUT = 2Vpp, AV = +1V/V VOUT = 1V step VOUT = 2V step, AV = +1V/V VCC = 0 to 3V step f = 1kHz f = 1kHz
0.003 2 2 1 3 22 0.4
Note 1: All devices are 100% production tested at TA = +25C. All temperature limits are guaranteed by design and characterization.
_______________________________________________________________________________________
3
Low-Cost, Low-Voltage, Rail-to-Rail, Input/Output, SOT23 5MHz Op Amp MAX4321
Typical Operating Characteristics
(VCC = +5V, VEE = 0, VCM = VCC/2, TA = +25C, unless otherwise noted.)
GAIN AND PHASE vs. FREQUENCY (WITH CLOAD)
180 144 40 GAIN GAIN (dB) 20 108 PHASE (DEGREES) 72 36 0 0 PHASE -36 -72 -20 AV = +1000 NO LOAD 1k 10k 100k 1M 10M -108 -144 -180 100M -40 100 -20 AV = +1000 RL = CL = 500pF 1k 10k 100k 1M 10M 40 GAIN 60
GAIN AND PHASE vs. FREQUENCY
60
MAX4321-01
POWER-SUPPLY REJECTION vs. FREQUENCY
144 108 PHASE (DEGREES) 72 36 0 0 -20 PSR (dB) -40 -60 -80 -100 10 100 1k 10k 100k 1M 10M 100M AV = +1
MAX4321-03
MAX4321-02
180
GAIN (dB)
20
0
PHASE
-36 -72 -108 -144 -180 100M
-40 100
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
OUTPUT IMPEDANCE vs. FREQUENCY
MAX4321-04
SUPPLY CURRENT vs. TEMPERATURE
MAX4321-05
INPUT OFFSET VOLTAGE vs. TEMPERATURE
2.25 1.50 VOLTAGE (mV) 0.75 0 -0.75 -1.50 -2.25 -3.00 -40 -25 -10 5 20 35 50 65 80 95
MAX4321-06
100 AV = +1 OUTPUT IMPEDANCE () 10
900 850 SUPPLY CURRENT (A) 800 750 700 650 600 550 VCC = 2.7V VCC = 6.5V
3.00
1
0.1
0.01 100 1k 10k 100k 1M 10M 100M FREQUENCY (Hz)
500 -40 -25 -10 5 20 35 50 65 80 95 TEMPERATURE (C)
TEMPERATURE (C)
INPUT BIAS CURRENT vs. COMMON-MODE VOLTAGE
MAX4321-07
INPUT BIAS CURRENT vs. TEMPERATURE
MAX4321-08
COMMON-MODE REJECTION vs. TEMPERATURE
115 110 105 100 95 90 85 80 VCM = -0.2V TO 5.2V VCM = 0 TO 5.0V
MAX4321-09
50 40 INPUT BIAS CURRENT (nA) 30 20 10 0 -10 -20 -30 -40 -50 0 1 2 3 4 5 6 COMMON-MODE VOLTAGE (V) VCC = 2.7V VCC = 6.5V
50 40 INPUT BIAS CURRENT (nA) 30 20 10 0 -10 -20 -30 -40 -50 -60 -40 -25 -10 5 20 35 50 65 80 95 TEMPERATURE (C) VCC = 6.5V, VCM = VEE VCC = 2.7V, VCM = VEE VCC = 6.5V, VCM = VCC VCC = 2.7V, VCM = VCC
120 COMMON-MODE REJECTION (dB)
-40 -25 -10
5
20
35
50
65
80
95
TEMPERATURE (C)
4
_______________________________________________________________________________________
Low-Cost, Low-Voltage, Rail-to-Rail, Input/Output, SOT23 5MHz Op Amp
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0, VCM = VCC/2, TA = +25C, unless otherwise noted.)
MAX4321
MINIMUM OUTPUT VOLTAGE vs. TEMPERATURE
MAX4321-10
MAXIMUM OUTPUT VOLTAGE vs. TEMPERATURE
MAX4321-11
LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE
VCC = 2.7V RL TO VEE RL = 100k
MAX4321-12
250 RL TO VCC 200 VOUT - VEE (mV) VCC = 6.5V, RL = 500
300 RL TO VEE 250 VCC - VOUT (mV) 200 VCC = 6.5V, RL = 500
120 110 100 GAIN (dB)
150 VCC = 2.7V, RL = 500 100
RL = 10k RL = 2k RL = 500
150 100
VCC = 2.7V, RL = 500
90 80
50
VCC = 6.5V, RL = 100k VCC = 2.7V, RL = 100k -40 -25 -10 5 20 35 50 65 80 95 TEMPERATURE (C)
50 0
VCC = 6.5V, RL = 100k (TOP) VCC = 2.7V, RL = 100k (BOTTOM)
70 60
0
-40 -25 -10
5
20
35
50
65
80
95
0
100
200
300
400
500
600
TEMPERATURE (C)
OUTPUT VOLTAGE: FROM VCC (mV)
LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE
MAX4321-13
LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE
MAX4321-14
LARGE-SIGNAL GAIN vs. OUTPUT VOLTAGE
VCC = 6.5V RL TO VCC RL = 100k RL = 10k RL = 2k
MAX4321-15
120 110 100 GAIN (dB) 90 80
VCC = 6.5V RL TO VEE RL = 100k
120 110 100 GAIN (dB) 90 80 RL = 2k RL = 500 VCC = 2.7V RL TO VCC RL = 100k RL = 10k
120 110 100 GAIN (dB) 90
RL = 10k RL = 2k
RL = 500 80 70 60
RL = 500 70 60 0 100 200 300 400 500 600 OUTPUT VOLTAGE: FROM VCC (mV) 70 60 0 100 200 300 400 500 600 OUTPUT VOLTAGE: FROM VEE (mV)
0
100
200
300
400
500
600
OUTPUT VOLTAGE: FROM VEE (mV)
LARGE-SIGNAL GAIN vs. TEMPERATURE
MAX4321-16
LARGE-SIGNAL GAIN vs. TEMPERATURE
VCC = 6.5V, RL TO VEE VCC = 6.5V, RL TO VCC 120 115
MAX4321-17
MINIMUM OPERATING VOLTAGE vs. TEMPERATURE
MINIMUM OPERATING VOLTAGE (V)
MAX4321-18
125 120 115 110 GAIN (dB) 105 100 95 90 85 80 75
RL = 500 VOUT(p-p) = VCC - 1V
125
1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2
VCC = 6.5V, RL TO VEE VCC = 2.7V, RL TO VEE
110 GAIN (dB) 105 100 95 90 85 VCC = 2.7V, RL TO VEE VCC = 2.7V, RL TO VCC
VCC = 6.5V, RL TO VCC
VCC = 2.7V, RL TO VCC -40 -25 -10 5 20 35 50 65 80 95
80 75
VOUT(p-p) = VCC - 600mV RL = 100k -40 -25 -10 5 20 35 50 65 80 95
-40 -25 -10
5
20
35
50
65
80
95
TEMPERATURE (C)
TEMPERATURE (C)
TEMPERATURE (C)
_______________________________________________________________________________________
5
Low-Cost, Low-Voltage, Rail-to-Rail, Input/Output, SOT23 5MHz Op Amp MAX4321
Typical Operating Characteristics (continued)
(VCC = +5V, VEE = 0, VCM = VCC/2, TA = +25C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY
MAX4321-19
TOTAL HARMONIC DISTORTION PLUS NOISE vs. PEAK-TO-PEAK SIGNAL AMPLITUDE
AV = +1 10kHz SINE WAVE RL TO VCC / 2 500kHz LOWPASS FILTER RL = 2k
MAX4321-20
SMALL-SIGNAL TRANSIENT RESPONSE (NONINVERTING)
AV = +1
MAX4321-21
0.040 0.035 0.030 THD + NOISE (%) 0.025 0.020 0.015 0.010 0.005 0 10 100 1k 10k FREQUENCY (Hz) AV = +1 2Vp-p SIGNAL 500kHz LOWPASS FILTER RL = 10k TO VCC / 2
0.1
IN VOLTAGE 50mV/div OUT
THD + NOISE (%)
0.01
RL = 250
RL = 10k 0.001 100k 4.0 4.2 4.4
RL = 100k
4.6
4.8
5.0
200ns/div
PEAK-TO-PEAK SIGNAL AMPLITUDE (V)
MAX4321-22
MAX4321-23
AV = -1
AV = +1
AV = -1
IN VOLTAGE 50mV/div
IN VOLTAGE 2V/div
IN VOLTAGE 2V/div
OUT
OUT
OUT
200ns/div
2s/div
2s/div
Pin Description
PIN 1 2 3 4 5 NAME OUT VCC IN+ INVEE Output Positive Supply Noninverting Input Inverting Input Negative Supply. Connect to ground for single-supply operation. FUNCTION
6
_______________________________________________________________________________________
MAX4321-24
SMALL-SIGNAL TRANSIENT RESPONSE (INVERTING)
LARGE-SIGNAL TRANSIENT RESPONSE (NONINVERTING)
LARGE-SIGNAL TRANSIENT RESPONSE (INVERTING)
Low-Cost, Low-Voltage, Rail-to-Rail, Input/Output, SOT23 5MHz Op Amp
__________ Applications Information
Rail-to-Rail Input Stage
The MAX4321 high-speed amplifier has rail-to-rail input and output stages designed for low-voltage, singlesupply operation. The input stage consists of separate NPN and PNP differential stages, which combine to provide an input common-mode range extending to the supply rails. The PNP stage is active for input voltages close to the negative rail, and the NPN stage is active for input voltages near the positive rail. The switchover transition region, which occurs near VCC / 2, has been extended to minimize the slight degradation in CMRR caused by the mismatch of the input pairs. Its low offset voltage, high bandwidth, and rail-to-rail common-mode range makes this op amp an excellent choice for precision, low-voltage, data-acquisition systems. Since the input stage switches between the NPN and PNP pairs, the input bias current changes polarity as the input voltage passes through the transition region. To reduce the offset error caused by input bias currents flowing through external source impedances, match the effective impedance seen by each input (Figures 1a, 1b). High source impedances, together with the input capacitance, can create a parasitic pole that produces an underdamped signal response. Reducing the input impedance or placing a small (2pF to 10pF) capacitor across the feedback resistor improves the response. The MAX4321's inputs are protected from large differential input voltages by 1k series resistors and back-toback triple diodes across the inputs (Figure 2). For differential input voltages less than 1.8V, the input resistance is typically 500k. For differential input voltages greater than 1.8V, the input resistance is approximately 2k, and the input bias current is determined by the following equation: VDIFF - 1.8V 2k
MAX4321
IBIAS =
R3
R3
MAX4321
MAX4321
R1 R3 = R1 R2
R2 R3 = R1 R2
R1
R2
Figure 1a. Reducing Offset Error Due to Bias Current (Noninverting)
Figure 1b. Reducing Offset Error Due to Bias Current (Inverting)
1k
1k
Figure 2. Input Protection Circuit _______________________________________________________________________________________ 7
Low-Cost, Low-Voltage, Rail-to-Rail, Input/Output, SOT23 5MHz Op Amp MAX4321
Rail-to-Rail Output Stage
The minimum output voltage will be within millivolts of ground for single-supply operation where the load is referenced to ground (VEE). Figure 3 shows the input voltage range and output voltage swing of a MAX4321 connected as a voltage follower. With a +3V supply and the 100k load tied to ground, the output swings from 0.02V to 2.97V. The maximum output voltage swing depends on the load but will be within 300mV of a +5V supply, even with the maximum load (250 to ground). Driving a capacitive load can cause instability in most high-speed op amps, especially those with low quiescent current. The MAX4321 has a high tolerance for capacitive loads. It is stable with capacitive loads up to 500pF. Figure 4 gives the stable operating region for capacitive loads. Figures 5 and 6 show the response with capacitive loads and the results of adding an isolation resistor in series with the output (Figure 7). The resistor improves the circuit's phase margin by isolating the load capacitor from the op amp's output.
IN
VCC = 3V AV = +1
10,000
LOAD CAPACITIVE (pF)
UNSTABLE REGION
VOLTAGE 1V/div
1000
OUT
RL = 100k 2s/div 100 100
RL TO VEE VOUT = VCC / 2 1k 10k RESISTIVE LOAD () 100k
Figure 3. Rail-to-Rail Input /Output Voltage Range
Figure 4. Capacitive-Load Stability
AV = +1 CL = 500pF IN IN VOLTAGE 50mV/div VOLTAGE 50mV/div OUT OUT
AV = +1 CL = 1000pF RS = 39
400ns/div
400ns/div
Figure 5. Small-Signal Transient Response with Capacitive Load
Figure 6. Transient Response to Capacitive Load with Isolation Resistor
8
_______________________________________________________________________________________
Low-Cost, Low-Voltage, Rail-to-Rail, Input/Output, SOT23 5MHz Op Amp
Power-Up
The MAX4321 typically settles within 1s after power-up. Using the test circuit of Figure 8, Figures 9 and 10 show the output voltage and supply current on power-up. Good layout improves performance by decreasing the amount of stray capacitance at the op amp's inputs and outputs. To decrease stray capacitance, minimize trace lengths and resistor leads by placing external components close to the op amp's pins.
MAX4321
Power Supplies and Layout
The MAX4321 operates from single +2.4V to +6.5V or dual 1.2V to 3.25V supplies, though it typically operates down to +1.8V (0.9V). For single-supply operation, bypass the power supply with a 0.1F ceramic capacitor in parallel with at least 1F. For dual supplies, bypass each supply to ground.
Package Information
TRANSISTOR COUNT: 84
VCC
MAX4321
0V TO 2.7V STEP FOR POWER-UP TEST 2k
RS
VOUT
CL
MAX4321
2k SUPPLY-CURRENT 10 MONITORING POINT 10k
Figure 7. Capacitive-Load-Driving Circuit
Figure 8. Power-Up Test Circuit
VCC VOLTAGE 1V/div
VCC 1V/div
OUT
ICC 500A/div
5s/div
5s/div
Figure 9. Power-Up Output Voltage
Figure 10. Power-Up Supply Current
_______________________________________________________________________________________
9
Low-Cost, Low-Voltage, Rail-to-Rail, Input/Output, SOT23 5MHz Op Amp MAX4321
Package Information
SOT5L.EPS
10
______________________________________________________________________________________
Low-Cost, Low-Voltage, Rail-to-Rail, Input/Output, SOT23 5MHz Op Amp
NOTES
MAX4321
11
______________________________________________________________________________________
Low-Cost, Low-Voltage, Rail-to-Rail, Input/Output, SOT23 5MHz Op Amp MAX4321
NOTES
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.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

▲Up To Search▲

Price & Availability of MAX4321

	To Download MAX4321 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .