View MAX428ACPA_47375.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

19-2394; Rev 1; 7/97
Single/Dual/Quad High-Speed, Fast-Settling, High Output Current Operational Amplifier
General Description
The MAX408/428/448 are high speed general purpose monolithic operational amplifiers in a single, dual or quad package, that are useful for signal frequencies extending into the video range. These Op Amps function in gain configurations greater-than or equal-to 3. High output current allows large capacitive loads to be driven at high speeds. Open-loop voltage gain of 10k V/V and high slew rate of 90V/s make the MAX408/428/448 ideal for analog amplification and high speed signal processing. 100MHz gain bandwidth and a 0.1% settling time of l50ns make each amplifier ideal for fast data conversion systems. The amplifiers are capable of driving back terminated transmission lines of 75 with amplitudes of 5V peakto-peak. Along with the high speed and output drive capability, a 35nA offset current and trimmable offset voltage make the MAX408/428/448 optimal for signal conditioning applications where accuracy must be maintained. o Fast Settling Time: 0.1% In 150ns o High Slew Rate: 90V/s o Large Gain Bandwidth: 100MHz o Full Power Bandwidth: 4.8MHz at 6V p-p o Ease of Use: Internally Compensated for ACL 3 with 50-60 Phase Margin o Low Supply Voltage Operation: 4V o Wide Input Voltage Range: Within 1.5V of V+ and 0.5V of Vo Minimal Crosstalk: >90dB Separation (MAX428/448) o Short Circuit Protection
Features
MAX408/428/448
Applications
Video Amplifiers Test Equipment Waveform Generators Video Distribution Pulse Amplifiers
PART MAX408ACPA
Ordering Information
TEMP. RANGE 0C to +70C PIN-PACKAGE 8 Lead Plastic DIP
MAX408ACSA 0C to +70C 8 Lead Small Outline MAX408CPA 0C to +70C 8 Lead Plastic DIP MAX408CSA 0C to +70C 8 Lead Small Outline MAX408C/D 0C to +70C Dice Ordering Information continued at end of data sheet.
Pin Configurations
TOP VIEW
OUTA 1 + + -INA 2 3 A D -
14 OUTD 13 -IND 12 +IND
BALANCE 1
8
N.C. V+ OUT BALANCE
OUT 1 1 -INA 2 +INA 3
MAX408
-IN 2 +IN 3 + 7 6 5
A + B +
8 7 6 5
V+ OUT2 -INB +INB
+INA
V+ 4 +INB 5 -INB 6 OUTB 7 -
MAX448
+ +
11 V10 +INC
B
C
9 8
-INC OUTC
V- 4
V- 4
MAX428
DIP/SO DIP/SO
DIP/SO
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
Single/Dual/Quad High-Speed, Fast-Settling, High Output Current Operational Amplifier MAX408/428/448
ABSOLUTE MAXIMUM RATINGS
Supply Voltages.....................................................................+6V Differential Input Voltage .......................................................+9V Common Mode Input Voltage .......................................|Vs| -0.5V Output Short Circuit Current Duration ...........................Indefinite Continuous Power Dissipation (TA = +70C) 8-Pin Plastic DIP (derate 9.09mW/C above +70C) ....727mW 8-Pin SO (derate 5.88mW/C above +70C).................471mW 14-Pin Plastic DIP (derate 10.00mW/C above +70C) .........................800mW 14-Pin SO (derate 8.33mW/C above +70C)...............667mW Operating Temperature Range Commercial (MAX4_8AC/C) ................................0C to +70C Storage Temperature Range .............................-65C to +150C Lead Temperature (Soldering, 60 seconds)...................+300 C
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--MAX408
(VS = 5V, TA = +25C, unless otherwise noted.) PARAMETER Input Offset Voltage Average Offset Voltage Drift Input Bias Current Input Offset Current Input Common Mode Range Differential Input Resistance Common Mode Input Resistance Differential Input Capacitance Common Mode Input Capacitance Input Voltage Noise Open Loop Voltage Gain Output Voltage Swing Power Supply Current Common Mode Rejection Ratio Power Supply Rejection Ratio Slew Rate (Note 1) SYMBOL VOS VOS/T IB IOS VCM RIND RINC CIND CINC eN AV VOUT IS CMRR PSRR SR VCM = 2V VPS = 0.5V 10-90% of Leading Edge (Figure 1) To 0.1% (4mV) of Final Value (Figure 1) (Note 1) 60 60 60 BW = 10Hz to 100kHz VOUT = 3V, RL = 2k RL = 2k RL = 150 2 3.5 2.0 (Note 1) (Note 1) TA = 25C 0C TA 70C +3 -4 3 4 CONDITIONS TA = 25C 0C TA 70C 0C TA 70C MAX408C MIN TYP 5 8 20 650 35 70 +3.5 -4.5 10 8 2 3 12 5 2.4 7 70 66 90 10 60 60 60 5 3.5 2.5 1100 120 200 +3 -4 3 4 MAX 12 16 MIN MAX408AC TYP 3 5 20 650 35 70 +3.5 -4.5 10 8 2 3 12 10 2.7 7 70 66 90 10 1100 120 200 MAX 6 10 UNITS mV V/C nA nA V M M pF pF VRMS V/mV V mA dB dB V/S
Settling Time Gain Bandwidth Product
tS GBW
150 100
200
150 100
200
ns MHz
Note 1: Not tested, guaranteed by design. 2 _______________________________________________________________________________________
Single/Dual/Quad High-Speed, Fast-Settling, High Output Current Operational Amplifier
ELECTRICAL CHARACTERISTICS--MAX428
(VS = 5V, TA = +25C, unless otherwise noted.) PARAMETER Input Offset Voltage Average Offset Voltage Drift Input Bias Current Input Offset Current Input Common Mode Range Differential Input Resistance Common Mode Input Resistance Differential Input Capacitance Common Mode Input Capacitance Input Voltage Noise Open Loop Voltage Gain Output Voltage Swing Power Supply Current (Both Amplifiers) Common Mode Rejection Ratio Power Supply Rejection Ratio Slew Rate (Note 1) SYMBOL VOS VOS/T IB IOS VCM RIND RINC CIND CINC eN AV VOUT IS CMRR PSRR SR VCM = 2V VPS = 0.5V 10-90% of Leading Edge (Figure 1) To 0.1% (4mV) of Final Value (Figure 1) (Note 1) 60 60 60 BW = 10Hz to 100kHz VOUT = 3V, RL = 2k RL = 2k RL = 150 2 3.5 2.0 (Note 1) (Note 1) +3 -4 3 4 CONDITIONS TA = 25C 0C TA 70C 0C TA 70C TA = 25C 0C TA 70C MAX428C MIN TYP 5 8 20 650 35 +3.5 -4.5 10 8 2 3 12 5 2.4 15 70 66 90 20 60 60 60 5 3.5 2.5 1100 1700 120 +3 -4 3 4 MAX 12 16 MIN MAX428AC TYP 3 5 20 650 35 +3.5 -4.5 10 8 2 3 12 10 2.7 15 70 66 90 20 1100 1700 120 MAX 6 10 UNITS mV V/C mA nA V M M pF pF VRMS V/mV V mA dB dB V/S
MAX408/428/448
Settling Time Gain Bandwidth Product
tS GBW
150 100
200
150 100
200
ns MHz
Note 1: Not tested, guaranteed by design.
_______________________________________________________________________________________
3
Single/Dual/Quad High-Speed, Fast-Settling, High Output Current Operational Amplifier MAX408/428/448
ELECTRICAL CHARACTERISTICS--MAX448
(VS = 5V, TA = +25C, unless otherwise noted.) PARAMETER Input Offset Voltage Average Offset Voltage Drift Input Bias Current Input Offset Current Input Common Mode Range Differential Input Resistance Common Mode Input Resistance Differential Input Capacitance Common Mode Input Capacitance Input Voltage Noise Open Loop Voltage Gain Output Voltage Swing Power Supply Current (All Four Amplifiers) Power Supply Rejection Ratio Common Mode Rejection Ratio Slew Rate (Note 1) SYMBOL VOS VOS/T IB IOS VCM RIND RINC CIND CINC eN AV VOUT IS PSRR CMRR SR VPS = 0.5V VCM = 2V 10-90% of Leading Edge (Figure 1) To 0.1% (4mV) of Final Value (Figure 1) (Note 1) 60 60 60 BW = 10Hz to 100kHz VOUT = 3V, RL = 2k RL = 2k RL = 150 2 3.5 2.0 (Note 1) (Note 1) +3 -4 3 4 CONDITIONS TA = 25C 0C TA 70C 0C < TA 70C TA = 25C 0C TA 70C MAX408C MIN TYP 5 8 20 650 35 +3.5 -4.5 10 8 2 3 12 5 2.4 30 66 70 90 40 60 60 60 4 3.5 2.5 3 12 10 2.7 30 66 70 90 40 1100 1700 120 +3 -4 3 4 MAX 12 16 MIN MAX408AC TYP 3 5 20 650 35 +3.5 -4.5 10 8 1100 1700 120 MAX 6 10 UNITS mV V/C nA nA V M M pF pF VRMS V/mV V mA dB dB V/S
Settling Time Gain Bandwidth Product
tS GBW
150 100
200
150 100
200
ns MHz
Note 1: Not tested, guaranteed by design.
AC CHARACTERISTICS--MAX408/428/448
(VS = 5V, TA = +25C, unless otherwise specified.) PARAMETER Small Signal Rise/Fall Time Full Power Bandwidth Amp-Amp Crosstalk (MAX428/448) 4 SYMBOL tr/tf BWFP CONDITIONS eO = 100mV 10-90% (Figure 1) RL = 2k, CL = 50pF VOUT = 6Vp-p Input Referenced f = 10kHz MAX4XXC MIN TYP 7 4.8 -96 MAX MIN MAX4XXC TYP 7 4.8 -96 MAX UNITS ns MHz dB
_______________________________________________________________________________________
Single/Dual/Quad High-Speed, Fast-Settling, High Output Current Operational Amplifier
Typical Operating Characteristics
(VS = 5, TA = +25C, unless otherwise stated and apply for each individual op amp where applicable.)
INPUT BIAS CURRENT vs. TEMPERATURE
MAX408-01
MAX408/428/448
NORMALIZED OPEN LOOP GAIN vs. TEMPERATURE
MAX408-02
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX408-03
1200 1000 INPUT BIAS CURRENT (nA) 800 600 400 200 0 10 20 30 40 50 60
10 NORMALIZED OPEN LOOP GAIN (dB)
10
5 SUPPLY CURRENT (mA) 0 10 20 30 40 50 60 70
8
0
6
-5
4
-10
2
70
3
4
5
6
TEMPERATURE (C)
TEMPERATURE (C)
SUPPLY VOLTAGE (V)
OPEN LOOP GAIN vs. SUPPLY VOLTAGE
MAX408-04
INPUT OFFSET CURRENT vs. TEMPERATURE
MAX408-05
AMPLIFIER/AMPLIFIER CROSSTALK vs. FREQUENCY (MAX428/448)
MAX408-06
90
100
-20
INPUT OFFSET CURRENT (nA)
80 GAIN (dB)
80 CROSSTALK (dB) 0 10 20 30 40 50 60 70
-40
60
-60
70
40
-80
60
20
-100
50 3 4 5 6 SUPPLY VOLTAGE (V) TEMPERATURE (C)
-120 1k 10k 100k 1M 10M 100M FREQUENCY (Hz)
MAXIMUM OUTPUT VOLTAGE SWING vs. LOAD RESISTANCE
MAX408-07
MAXIMUM OUTPUT VOLTAGE SWING vs. TEMPERATURE
8 P-P VOLTAGE SWING (V) RL = 2k
MAX408-08
5 NEGATIVE SWING 4 VOLTAGE SWING (V) POSITIVE SWING 3
6 RL = 50
2
4
1
2
0 10 100 LOAD RESISTANCE () 1k
0 0 10 20 30 40 50 60 70 TEMPERATURE (C)
_______________________________________________________________________________________
5
Single/Dual/Quad High-Speed, Fast-Settling, High Output Current Operational Amplifier MAX408/428/448
Typical Operating Characteristics
(TA = +25C, unless otherwise noted.)
SHORT CURCUIT OUTPUT CURRENT vs. TEMPERATURE
SHORT CIRCUIT OUTPUT CURRENT (mA)
MAX408-09
EQUIVALENT INPUT NOISE vs. BANDWIDTH
MAX408-10
120 100 80 60 40 20 0 10 20 30 40 50 60 -ISC +ISC
100 EQUIVALENT INPUT NOISE (V)
10
RSOURCE = 10k RSOURCE = 0
1 THERMAL NOISE OF 10k RESISTOR 0.1 100 1k 10k 100k 1M BANDWIDTH (Hz) (LOWER - 3dB FREQUENCY = 10Hz)
70
TEMPERATURE (C)
OPEN LOOP FREQUENCY RESPONSE
80 60 OPEN LOOP GAIN (AV, dB) Av 40 20 0 -20 -40 1kHz 10kHz 100kHz 1MHz FREQUENCY 10MHz 100MHz RL = 2k CL = 5pF 10dB GAIN MARGIN = GM
MAX408toc11
OPEN LOOP FREQUENCY RESPONSE, RL = 50, CL = 50pF
0 60 OPEN LOOP GAIN (Av, dB) 35 30 25 20 15 10 5 0 -5 -10 -15 -20 Av
MAX408-12
0 60 120 180 240 300 360 1M 10M 100M 1G PHASE (, DEGREES) 70 60 6 5 4 RL = 2k CL = 50pF 0 20 40 TEMPERATURE (C) 60 80 GM 50 40 180 DEGREE FREQUENCY (MHz) 80
PHASE (, DGREES)
10dB PHASE MARGIN = M
120 180 240 300 360 1GHz
FREQUENCY (Hz)
OPEN LOOP FREQUENCY RESPONSE, RL = 2k, CL = 50pF
35 30 25 20 15 10 5 0 -5 -10 -15 -20
MAX408-13
10dB PHASE MARGIN AND 10dB FREQUENCY vs. TEMP
MAX408toc14
GAIN MARGIN AND 180 DEGREE FREQUENCY vs. TEMP (AV = 10dB)
40 GAIN MARGIN (GM, dB) 35 30 10dB FREQUENCY (MHz) 180 FREQUENCY
MAX408toc15
0 Av 10dB PHASE MARGIN (M, DEGREES) 60 120 180 240 300 360 1M 10M 100M 1G 0 PHASE (, DEGREES) 10dB FREQUENCY
OPEN LOOP GAIN (Av, dB)
55 50 45 RL = 2k CL = 50pF 20
M
25
40 TEMPERATURE (C)
60
80
FREQUENCY (Hz)
6
_______________________________________________________________________________________
Single/Dual/Quad High-Speed, Fast-Settling, High Output Current Operational Amplifier MAX408/428/448
+1V 2k 1k SETTLING TIME eIN eO RL 2k CL
10pF
eIN -1V
90%
2V 4mV OF FINAL VALUE
150
300 eS = SETTLE VOLTAGE eOUT -2V 10%
SLEW RATE
Note that to properly measure es, amplifier and settle resistor ratios should be matched to 0.5% and probe capacitance 35pF Figure 1A. Settling Time and Slew Rate Test Circuit
eIN
OV
eo
OV
Figure 1C. Small Signal Response
eo OV
___________Application Information
AC Characteristics
The 35MHz 10dB crossover point of the MAX408/ 428/448 is achieved without feed forward compensation, a technique which can produce long tails in the recovery characteristic. The single pole rolloff follows the classic 20dB/decade slope to frequencies approaching 50MHz. The 10dB (3.2V/V) phase margin of 50, even with a capacitive load of 50pF, gives stable and predictable performance down to non-inverting gain configurations of approximately 3V/V (inverting gains of -2V/V). At frequencies beyond 50MHz, the 20dB/decade slope is disturbed by an output stage zero, the damping factor of which is dependent upon the RL, CL load combination. This results in loss of gain
es
OV
Figure 1B. Large Signal Response
_______________________________________________________________________________________
7
Single/Dual/Quad High-Speed, Fast-Settling, High Output Current Operational Amplifier MAX408/428/448
margin (gain at loop phase = 360) at frequencies of 70 to 100MHz which at a gain margin of 5dB (RL = 2k, CL = 5pF) results in a peak in the gain of 3 amplifier configurations as shown in Figures 3 and 4. Figure 3 shows a blow up of the open loop characteristics in the 10MHz to 200MHz frequency range, as well as the corresponding closed loop characteristics for a gain of three non-inverting amplifier at similar load conditions. It should be noted that the open loop characteristic does not show the additional phase shift covered by the input capacitance pole. This is why the closed loop peaking at 30 to 40MHz is greater than what would be expected from the 50 to 60 degrees of phase margin indicated by the open loop characteristics. Corresponding small signal step response characteristics show well-behaved pulse waveforms with 16-33% overshoot. The input capacitive pole can be neutralized by adding a feedback capacitor to R2. The value of capacitance is selected according to R1 CIN = R2CFB, where CIN is the sum of the common mode and differential input capacitance 5pF. For R2 = 2R1, CFB = CIN/2 2.5pF. Figure 4 shows the results of this feedback capacitor addition. Neutralizing the input capacitance demonstrates the peaking that can result from the loss of gain margin at 70 to 100MHz. As the load time constant (RLCL) increases the peaking gets progressively worse 6dB at RL = 2K, CL = 50pF. The step response waveforms are as expected with a very strong 88MHz ring being exhibited at RL = 2k, CL = 50pF and no overshoot at RL = 50, CL = 5pF.
Layout Considerations
As with any high-speed wideband amplifier, certain layout considerations are necessary to ensure stable operation. All connections to the amplifier should remain as short as possible, and the power supplies bypassed with 0.1F capacitors to signal ground. It is suggested that a ground plane be considered as the best method for ensuring stability because it minimizes stray inductance and unwanted coupling in the ground signal paths. To minimize capacitive effects, resistor values should be kept as small as possible, consistent with the application.
MAX408 Offset Voltage Nulling
The configuration of Figure 2 will give a typical VOS nulling range of 15mV. If a smaller adjustment range is desired, resistor values R1 and R2 can be increased accordingly. For example, at R1 = 3.6k, the adjustment range is 5mV. Since pins 1 and 5 are not part of the signal path, AC characteristics are left undisturbed.
RP = 10k
R1 = 1.3k 2 1 V+ BAL. BAL. 3
R2 = 1.3k
56
Figure 2. VOS Nulling Method for MAX408
Simplified Schematic. For MAX428/448 omit balance pins.
8
_______________________________________________________________________________________
Single/Dual/Quad High-Speed, Fast-Settling, High Output Current Operational Amplifier MAX408/428/448
OPEN LOOP FREQUENCY RESPONSE
20 OPEN LOOP GAIN (AV, dB) 15 10 5 0 -5 -10 10MHz R = 50 AV, L CL = 5pF , RL = 50 CL = 5pF R = 2k AV, L CL = 50pF , RL = 2k CL = 50pF 60 120 180 240 300 360 R2 = 2k
PHASE (, DEGREES)
R1 = 1k RL eIN eo / eIN = (1 + R2 / R1) = 3V/V CL eO
100MHz FREQUENCY
1GHz
eIN
eO CLOSED LOOP FREQUENCY RESPONSE
20 CLOSED LOOP GAIN (AV, dB) 15 10 5 0 -5 -10 1MHz , RL = 50 CL = 5pF , RL = 2k CL = 50pF 100MHz 1GHz R1 = 1k, R2 = 2k R = 50 AV, L CL = 5pF R = 2k AV, L CL = 50pF 0 45 90 135 180 225 270 315
PHASE (, DEGREES)
RL = 2 CL = 50pF
eIN
10MHz
FREQUENCY
eO
RL = 50 CL = 5pF SMALL SIGNAL STEP RESPONSE
Figure 3. Frequency and Time Domain Response Characteristics, AV = 3
_______________________________________________________________________________________
9
Single/Dual/Quad High-Speed, Fast-Settling, High Output Current Operational Amplifier MAX408/428/448
CFB = 2.5pF
CLOSED LOOP FREQUENCY RESPONSE
20 2k CLOSED LOOP GAIN (AV, dB) 1k CIN 5pF RL CL eO 15 10 5 0 -5 -10 1MHz R = 2k AV, L CL = 50pF R1 = 1k R2 = 2k PHASE (, DEGREES) R = 50 AV, L CL = 5pF 0 45 90 135 180 225 270 315 100MHz 1GHz
eIN
10MHz
FREQUENCY
eIN
eO
RL = 2k CL = 50pF
eIN
eO
RL = 50 CL = 5pF SMALL SIGNAL STEP RESPONSE
Figure 4. Response Characteristics with Input Pole Cancellation, AV = 3
10
______________________________________________________________________________________
Single/Dual/Quad High-Speed, Fast-Settling, High Output Current Operational Amplifier
Ordering Information (continued)
PART MAX428A_CPA MAX428ACSA MAX428CPA MAX428CSA MAX428C/D MAX448ACPD MAX448ACSD MAX448CPD MAX448CSD MAX448C/D TEMP. RANGE 0C to +70C 0C to +70C 0C to +70C 0C to +70C 0C to +70C 0C to +70C 0C to +70C 0C to +70C 0C to +70C 0C to +70C PIN-PACKAGE 8 Lead Plastic DIP 8 Lead Small Outline 8 Lead Plastic DIP 8 Lead Small Outline Dice 14 Lead Plastic DIP 14 Lead Small Outline 14 Lead Plastic DIP 14 Lead Small Outline Dice
MAX408/428/448
11
______________________________________________________________________________________
Single/Dual/Quad High-Speed, Fast-Settling, High Output Current Operational Amplifier MAX408/428/448
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) 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

▲Up To Search▲

Price & Availability of MAX428ACPA

	To Download MAX428ACPA Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .