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19-0436; Rev 1; 3/96
KIT ATION EVALU ILABLE AVA
500MHz, Low-Power Op Amps
____________________________Features
o 500MHz Unity-Gain Bandwidth (MAX4100) 200MHz -3dB Bandwidth (AVCL = 2V/V, MAX4101) o 65MHz 0.1dB Gain Flatness (MAX4100) o 250V/s Slew Rate o 0.06%/0.04 Differential Gain/Phase o High Output Drive: 80mA o Low Power: 5mA Supply Current o Fast Settling Time: 18ns to 0.1% 35ns to 0.01%
_______________General Description
The MAX4100/MAX4101 op amps combine ultra-highspeed performance with low-power operation. The MAX4100 is compensated for unity-gain stability, while the MAX4101 is compensated for stability in applications with a closed-loop gain (AVCL) of 2V/V or greater. The MAX4100/MAX4101 require only 5mA of supply current while delivering a 500MHz unity-gain bandwidth (MAX4100) or a 200MHz -3dB bandwidth (MAX4101) with a 250V/s slew rate. These high-speed op amps have a wide output voltage swing of 3.5V and a high current-drive capability of 80mA.
MAX4100/MAX4101
________________________Applications
Video Cable Driver Ultrasound Gamma Cameras Portable Instruments Active Filters ADC Buffers
______________Ordering Information
PART MAX4100ESA MAX4100EUA MAX4101ESA TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 8 SO 8 MAX* 8 SO
* Contact factory for availability of MAX package.
________Typical Application Circuit
+5V 0.1F 1000pF INPUT 75
MAX4100 MAX4101
__________________Pin Configuration
TOP VIEW
75 75 1000pF -5V 390 75 75
N.C. 1 IN- 2 IN+ 3 VEE 4
8
N.C. VCC OUT N.C.
0.1F
MAX4100 MAX4101
7 6 5
SO/MAX*
390 75
VIDEO/RF DISTRIBUTION AMPLIFIER
* Contact factory for availability of MAX4100 MAX package.
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
500MHz, Low-Power Op Amps MAX4100/MAX4101
ABSOLUTE MAXIMUM RATINGS
Power-Supply Voltage (VCC, VEE) .........................................6V Voltage on Any Pin to Ground or Any Other Pin .........VCC to VEE Short-Circuit Duration (VOUT to GND) ...........................Indefinite Continuous Power Dissipation (TA = +70C) SO (derate 5.88mW/C above +70C) .........................471mW MAX (derate 4.10mW/C above +70C) ....................330mW Operating Temperature Ranges MAX4100E_A/MAX4101E_A ............................-40C to +85C 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.
ELECTRICAL CHARACTERISTICS
(VCC = 5V, VEE = -5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER DC SPECIFICATIONS Input Offset Voltage Input Offset Voltage Drift Input Bias Current Input Offset Current Common-Mode Input Resistance Common-Mode Input Capacitance Input Voltage Noise Integrated Voltage Noise Input Current Noise Integrated Current Noise Common-Mode Input Voltage Common-Mode Rejection Power-Supply Rejection Open-Loop Voltage Gain Quiescent Supply Current Output Voltage Swing Output Current Short-Circuit Output Current ISC VCM CMR PSR AOL ISY VOUT VCM = 2.5V VS = 4.5V to 5.5V VOUT = 2.0V, VCM = 0V VIN = 0V RL = RL = 100 RL = 30, TA = 0C to +85C Short to ground or either supply voltage 3.5 3.1 65 RL = RL = 100 in VOS TCVOS IB IOS RINCM CINCM en VOUT = 0V VOUT = 0V VOUT = 0V, VIN = -VOS VOUT = 0V, VIN = -VOS Either input Either input f = 100kHz f = 1MHz to 100MHz f = 100kHz f = 1MHz to 100MHz MAX4100 MAX4101 MAX4100 MAX4101 MAX4100 MAX4101 MAX4100 MAX4101 -2.5 75 55 53 51 90 60 58 56 5 3.8 3.5 80 90 6 1 15 3 0.05 5 1 8 6 100 75 0.8 0.8 10 10 2.5 9 0.5 8 mV V/C A A M pF nV/Hz VRMS pA/Hz nARMS V dB dB dB mA V mA mA SYMBOL CONDITIONS MIN TYP MAX UNITS
2
_______________________________________________________________________________________
500MHz, Low-Power Op Amps
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 5V, VEE = -5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER AC SPECIFICATIONS -3dB Bandwidth 0.1dB Bandwidth Slew Rate Settling Time Rise/Fall Times Differential Gain Differential Phase Input Capacitance Output Resistance Spurious-Free Dynamic Range Third-Order Intercept SR ts tR, tF DG DP CIN ROUT SFDR f = 10MHz fC = 5MHz, VOUT = 2Vp-p fC = 10MHz, AVCL = +2 MAX4100, AVCL = +1 MAX4101, AVCL = +2 MAX4100, AVCL = +1 MAX4101, AVCL = +2 BW VOUT 0.1VRMS MAX4100, AVCL = +1 MAX4100, AVCL = +2 -2V VOUT 2V -1V VOUT 1V, RL = 100 to 0.1% to 0.01% MAX4100 MAX4101 500 200 65 50 250 18 35 13 1.5 0.06 0.07 0.04 0.04 2 0.8 0.3 -70 -65 36 MHz MHz V/s ns ns % degrees pF dBc dBm SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX4100/MAX4101
10% to 90%, -2V VOUT 2V, RL = 100 10% to 90%, -50mV VOUT 50mV, RL = 100 f = 3.58MHz f = 3.58MHz MAX4100, AVCL = +1 MAX4101, AVCL = +2 MAX4100, AVCL = +1 MAX4101, AVCL = +2
__________________________________________Typical Operating Characteristics
(VCC = 5V, VEE = -5V, TA = +25C, unless otherwise noted.)
MAX4100 LARGE-SIGNAL PULSE RESPONSE (AVCL = +1)
MAX4100-02 MAX4100-03
VOLTAGE NOISE vs. FREQUENCY
MAX4100-01
CURRENT NOISE vs. FREQUENCY
10 9 CURRENT NOISE (pA/Hz) 8 7 6 5 4 3 2 MAX4100
70 60 VOLTAGE NOISE (nV/Hz) 50 40 30 20 10 0 10 100 1k 10k 100k MAX4101 MAX4100
IN VOLTAGE (500mV/div)
GND
OUT
GND
1 0 1M 10 FREQUENCY (Hz)
MAX4101 100 1k 10k 100k 1M TIME (10ns/div)
FREQUENCY (Hz)
_______________________________________________________________________________________
3
500MHz, Low-Power Op Amps MAX4100/MAX4101
____________________________Typical Operating Characteristics (continued)
(VCC = 5V, VEE = -5V, TA = +25C, unless otherwise noted.)
MAX4100 LARGE-SIGNAL PULSE RESPONSE (AVCL = +5)
MAX4100-04
MAX4100 OUTPUT RESISTANCE vs. FREQUENCY
MAX4100-05
MAX4100 SMALL-SIGNAL PULSE RESPONSE (AVCL = +1)
MAX4100-06
100
IN VOLTAGE (500mV/div)
GND 10 RESISTANCE ()
VOLTAGE (20mV/div)
IN
GND
1.0
OUT
GND
0.1
OUT
GND
0.01 TIME (20ns/div) 10k 100k 1M 10M 100M 1G FREQUENCY (Hz) TIME (10ns/div)
MAX4100 SMALL-SIGNAL PULSE RESPONSE (AVCL = +5)
MAX4100-07
MAX4101 OUTPUT RESISTANCE vs. FREQUENCY
MAX4100-08
MAX4101 LARGE-SIGNAL PULSE RESPONSE (AVCL = +2)
MAX4100-09
100
IN VOLTAGE (10mV/div)
GND 10 RESISTANCE ()
1.0
OUT
GND
VOLTAGE (500mV/div)
IN
GND
OUT
GND
0.1
0.01 TIME (50ns/div) 10k 100k 1M 10M 100M 1G FREQUENCY (Hz) TIME (10ns/div)
MAX4101 LARGE-SIGNAL PULSE RESPONSE (AVCL = +10)
MAX4100-10
MAX4101 SMALL-SIGNAL PULSE RESPONSE (AVCL = +2)
MAX4100-11a
MAX4101 SMALL-SIGNAL PULSE RESPONSE (AVCL = +10)
MAX4100-11b
VOLTAGE (500mV/div)
VOLTAGE (10mV/div)
IN
IN
GND IN VOLTAGE (10mV/div)
OUT
GND
OUT
GND
OUT
GND
TIME (20ns/div)
TIME (10ns/div)
TIME (50ns/div)
4
_______________________________________________________________________________________
500MHz, Low-Power Op Amps
____________________________Typical Operating Characteristics (continued)
(VCC = 5V, VEE = -5V, TA = +25C, unless otherwise noted.)
INPUT OFFSET VOLTAGE vs. TEMPERATURE
0.5 0 VOLTAGE (mV) CURRENT (A) -0.5 -1.0 -1.5 -2.0 -2.5 -3.0 -75 -50 -25 0 25 50 75 100 125 TEMPERATURE (C)
MAX4100 TOC-12
MAX4100/MAX4101
INPUT BIAS CURRENT vs. TEMPERATURE
MAX4100 TOC-14A
INPUT OFFSET CURRENT vs. TEMPERATURE
MAX4100 TOC-14B
1.0
7 6 5 4 3 2 1 0 -75 -50 -25 0 25 50
0.35 0.25 0.15 CURRENT (A) 0.05 -0.05 -0.15 -0.25 -0.35
75 100 125
-75 -50 -25
0
25
50
75 100 125
TEMPERATURE (C)
TEMPERATURE (C)
POWER-SUPPLY CURRENT vs. TEMPERATURE
MAX4100 TOC-13
MAX4100 COMMON-MODE REJECTION vs. FREQUENCY
80 70 CMR (dB) 60 50 40 30 PSR (dB)
MAX4100 TOC-15
MAX4100 POWER-SUPPLY REJECTION vs. FREQUENCY
70 60 50 40 PSR30 20 PSR+ 10 0 0.1M
MAX4100 TOC-16
7
90
80
6 CURRENT (mA)
5
4
20 10
3 -75 -50 -25 0 25 50 75 100 125 TEMPERATURE (C)
0 30k 100k 1M 10M 100M 1G FREQUENCY (Hz)
1M
10M
100M
1G
FREQUENCY (Hz)
POSITIVE OUTPUT SWING vs. TEMPERATURE
MAX4100 TOC-20A
OUTPUT SWING vs. LOAD RESISTANCE
MAX4100-17
6 5 POSITIVE OUTPUT SWING (V) 4 3 2 -2 -3 -4 -5 -6 -75 -50 -25 0 25 50 RL = RL = 100 RL = RL = 100
3.5 3.0 OUTPUT SWING (Vp-p) 2.5 2.0 1.5 1.0 0.5 0
75 100 125
10
22
33
50
75
TEMPERATURE (C)
LOAD RESISTANCE ()
_______________________________________________________________________________________
5
500MHz, Low-Power Op Amps MAX4100/MAX4101
____________________________Typical Operating Characteristics (continued)
(VCC = 5V, VEE = -5V, TA = +25C, unless otherwise noted.)
MAX4100 OPEN-LOOP GAIN AND PHASE vs. FREQUENCY
MAX4100-18
MAX4101 OPEN-LOOP GAIN AND PHASE vs. FREQUENCY
MAX4100-19
MAX4100 CLOSED-LOOP RESPONSE (AVCL = +1)
0 2 1 PHASE (DEGREES) 0 GAIN (dB) -1 -2 -3 -4 -5 -6 180 -7 0.1M 1M 10M 100M 1G FREQUENCY (Hz)
MAX4100 TOC-22
60 50 40 LOOP GAIN (dB) 30 20 10 0 -10 -20 10k 100k 1M 10M 100M 1G FREQUENCY (Hz) GAIN
0
60 50 PHASE (DEGREES) 40 LOOP GAIN (dB) 30 20 10 0 -10 GAIN
3
45
45
90 PHASE
90 PHASE
135
135
180
-20 10k 100k 1M 10M 100M 1G FREQUENCY (Hz)
MAX4101 CLOSED-LOOP RESPONSE (AVCL = +2)
MAX4100 TOC-23
MAX4100 HARMONIC DISTORTION vs. FREQUENCY
MAX4100 TOC-24
MAX4100 HARMONIC DISTORTION vs. FREQUENCY
-10 -20 -30 -40 -50 -60 -70 -80 -90 3rd HARMONIC 2nd HARMONIC GAIN = +2 VO = 2Vp-p RL = 100
MAX4100 TOC-25
9 8 7 6 GAIN (dB) 5 4 3 2 1 0 -1 0.1M 1M 10M 100M
0 HARMONIC DISTORTION (dBc) -10 -20 -30 -40 -50 -60 -70 -80 -90
2nd HARMONIC
3rd HARMONIC
1G
HARMONIC DISTORTION (dBc)
GAIN = +1 VO = 2Vp-p RL = 100
0
0.1
1
10
100
0.1
1
10
100
FREQUENCY (Hz)
FREQUENCY (MHz)
FREQUENCY (MHz)
MAX4100 HARMONIC DISTORTION vs. FREQUENCY
MAX4100 TOC-26
MAX4101 HARMONIC DISTORTION vs. FREQUENCY
MAX4100 TOC-27
MAX4101 HARMONIC DISTORTION vs. FREQUENCY
-10 -20 -30 -40 -50 -60 -70 -80 -90 3rd HARMONIC 2nd HARMONIC GAIN = +5 VO = 2Vp-p RL = 100
MAX4100 TOC-28
0 HARMONIC DISTORTION (dBc) -10 -20 -30 -40 -50 -60 -70 -80 -90
HARMONIC DISTORTION (dBc)
-20 -30 -40 -50 -60 -70 3rd HARMONIC -80 -90 2nd HARMONIC
2nd HARMONIC 3rd HARMONIC
HARMONIC DISTORTION (dBc)
GAIN = +5 VO = 2Vp-p RL = 100
0 -10
GAIN = +2 VO = 2Vp-p RL = 100
0
0.1
1
10
100
0.1
1
10
100
0.1
1
10
100
FREQUENCY (MHz)
FREQUENCY (MHz)
FREQUENCY (MHz)
6
_______________________________________________________________________________________
500MHz, Low-Power Op Amps
____________________________Typical Operating Characteristics (continued)
(VCC = 5V, VEE = -5V, TA = +25C, unless otherwise noted.)
MAX4101 HARMONIC DISTORTION vs. FREQUENCY
THIRD-ORDER INTERCEPT (dBm) -10 -20 -30 -40 -50 -60 3rd HARMONIC -70 -80 -90 0.1 1 10 100 FREQUENCY (MHz) 2nd HARMONIC GAIN = +10 VO = 2Vp-p RL = 100
MAX4100 TOC-29
MAX4100/MAX4101
TWO-TONE THIRD-ORDER INTERCEPT vs. FREQUENCY
35 20 25 20 15 10 5 0 0.1 1 10 100 FREQUENCY (MHz)
MAX4100-30
0 HARMONIC DISTORTION (dBc)
40
MAX4100 DIFFERENTIAL GAIN AND PHASE
0.02 -0.00 -0.02 -0.04 -0.06 -0.08 0 DIFF PHASE (deg) 0.05 0.04 0.03 0.02 0.01 0.00 -0.01 0 IRE 100
MAX4100-31
MAX4101 DIFFERENTIAL GAIN AND PHASE
0.02 -0.00 -0.02 -0.04 -0.06 -0.08 -0.10 0 DIFF PHASE (deg) 0.06 0.04 0.02 0.00 -0.02 0 IRE 100 DIFF GAIN (%)
MAX4100-32
DIFF GAIN (%)
100
100
______________________________________________________________Pin Description
PIN 1, 5, 8 2 3 4 6 7 NAME N.C. ININ+ VEE OUT VCC Inverting Input Noninverting Input Negative Power Supply, connected to -5V Amplifier Output Positive Power Supply, connected to +5V FUNCTION No Connection, not internally connected
_______________________________________________________________________________________
7
500MHz, Low-Power Op Amps MAX4100/MAX4101
_______________Detailed Description
The MAX4100/MAX4101 are low-power, high-bandwidth operational amplifiers optimized for driving back-terminated cables in composite video, RGB, and RF systems. The MAX4100 is unity-gain stable, and the MAX4101 is optimized for closed-loop gains greater than or equal to 2V/V (AVCL 2V/V). While consuming only 5mA (6mA max) supply current, both devices can drive 50 backterminated cables to 3.1V minimum. The MAX4100 features a bandwidth in excess of 500MHz and a 0.1dB gain flatness of 65MHz. It offers differential gain and phase errors of 0.06%/0.04, respectively. The MAX4101 features a -3dB bandwidth of 200MHz, a 0.1dB bandwidth of 50MHz, and 0.07%/0.04 differential gain and phase. Available in small 8-pin SO and MAX packages, these ICs are ideally suited for use in portable systems (in RGB, broadcast, or consumer video applications) that benefit from low power consumption. Regardless of whether a constant-impedance board is used, it is best to observe the following guidelines when designing the board. Wire-wrap boards are much too inductive, and breadboards are much too capacitive; neither should be used. IC sockets increase parasitic capacitance and inductance, and should not be used. In general, surface-mount components give better high-frequency performance than through-hole components. They have shorter leads and lower parasitic reactances. Keep lines as short and as straight as possible. Do not make 90 turns; round all corners. High-frequency bypassing techniques must be observed to maintain the amplifier accuracy. The bypass capacitors should include a 1000pF ceramic capacitor between each supply pin and the ground plane, located as close to the package as possible. Next, place a 0.01F to 0.1F ceramic capacitor in parallel with each 1000pF capacitor, and as close to each as possible. Then place a 10F to 15F low-ESR tantalum at the point of entry (to the PC board) of the power-supply pins. The power-supply trace should lead directly from the tantalum capacitor to the VCC and VEE pins. To minimize parasitic inductance, keep PC traces short and use surface-mount components.
__________Applications Information
Layout and Power-Supply Bypassing
The MAX4100/MAX4101 have an RF bandwidth and, consequently, require careful board layout. Depending on the size of the PC board used and the frequency of operation, it may be desirable to use constant-impedance microstrip or stripline techniques. To realize the full AC performance of this high-speed amplifier, pay careful attention to power-supply bypassing and board layout. The PC board should have at least two layers: a signal and power layer on one side, and a large, low-impedance ground plane on the other side. The ground plane should be as free of voids as possible. With multilayer boards, locate the ground plane on a layer that incorporates no signal or power traces.
RG
RF
MAX4100 MAX4100 MAX4101 MAX4101
VOUT
VIN
VOUT = [1 + (RF / RG)]VIN
Figure 1b. Noninverting Gain Configuration
RG RF
VIN
24
MAX4100 MAX4100 MAX4101 MAX4101
VOUT VIN
MAX4100 MAX4100 MAX4101 MAX4101
VOUT
VOUT = (RF / RG)VIN
VOUT = VIN
Figure 1a. Inverting Gain Configuration
8
Figure 1c. MAX4100 Unity-Gain Buffer Configuration
_______________________________________________________________________________________
500MHz, Low-Power Op Amps MAX4100/MAX4101
VIN RG RF
Table 1. Resistor and Bandwidth Values for Various Gain Configurations
GAIN (V/V) +1 +2 +5 +10 -1 -2 -5 -10 RG () 200 50 30 200 75 50 50 RF () 24 200 200 270 200 150 250 500 BANDWIDTH LIMIT* (MHz) 1659 398 995 1474 398 796 955 875
C
MAX4100 MAX4100 MAX4101
VOUT
Figure 2. Effect of Feedback Resistor Values and Parasitic Capacitance on Bandwidth
Setting Gain
The MAX4100/MAX4101 are voltage-feedback op amps that can be configured as an inverting or noninverting gain block, as shown in Figures 1a and 1b. The gain is determined by the ratio of two resistors and does not affect amplifier frequency compensation. In the unity-gain configuration (as shown in Figure 1c), maximum bandwidth and stability is achieved with the MAX4100 when a small feedback resistor is included. This resistor suppresses the negative effects of parasitic inductance and capacitance. A value of 24 provides the best combination of wide bandwidth, low peaking, and fast settling time. In addition, this resistor reduces the errors from input bias currents.
* Assuming an infinite bandwidth amplifier.
Resistor Types
Surface-mount resistors are the best choice for highfrequency circuits. They are of similar material to the metal film resistors, but are deposited using a thick-film process in a flat, linear manner so that inductance is minimized. Their small size and lack of leads also minimize parasitic inductance and capacitance, thereby yielding more predictable performance.
DC and Noise Errors
There are several major error sources to be considered in any operational amplifier. These apply equally to the MAX4100/MAX4101. Offset-error terms are given by the equation below. Voltage and current noise errors are root-square summed, so are computed separately. Using the circuit in Figure 3, the total output offset voltage is determined by: a) The input offset voltage (VOS) times the closed-loop gain (1 + RF / RG) b) The positive input bias current (I B+ ) times the source resistor (RS) minus the negative input bias current (IB-) times the parallel combination of RG and R F . I OS (offset current) is the difference between the two bias currents. If RG | | RF = RS, this part of the expression becomes IOS x RS. The equation for total DC error is: R VOUT = IOSRS + VOS 1 + F RG
Choosing Resistor Values
The values of feedback and input resistors used in the inverting or noninverting gain configurations are not critical (as is the case with current feedback amplifiers). However, take care when selecting because the ohmic values need to be kept small and noninductive for practical reasons. The input capacitance of the MAX4100/MAX4101 is approximately 2pF. In either the inverting or noninverting configuration, the bandwidth limit caused by the package capacitance and resistor time constant is f3dB = 1 / (2 RC), where R is the parallel combination of the input and feedback resistors (R F and R G in Figure 2) and C is the package and board capacitance at the inverting input. Table 1 shows the bandwidth limit for several values of RF and RG, assuming 4pF total capacitance (2pF for the MAX4100/MAX4101 and 2pF of PC board parasitics).
(
)
_______________________________________________________________________________________
9
500MHz, Low-Power Op Amps MAX4100/MAX4101
In both DC and noise calculations, errors are dominated by offset voltage and noise voltage (rather than by input bias current or noise current).
RI RF
IB-
Metal-film resistors with leads are manufactured using a thin-film process, where resistive material is deposited in a spiral layer around a ceramic rod. Although the materials used are noninductive, the spiral winding presents a small inductance (about 5nH) that may have an adverse effect on high-frequency circuits.
VOUT
RS
IB+
MAX4100 MAX4100 MAX4101
8 CLOSED-LOOP GAIN (dB) 6 4 2 0 -2 -4 -6 -8 -10
RS = 0 CL = 10pF
Figure 3. Output Offset Voltage
c) Total output-referred noise voltage is shown by the equation below (en(OUT)): R en(OUT) = 1 + F RG
CL = 5pF CL = 0pF
(2inRS )2 + (eN )2
The MAX4100/MAX4101, with two high-impedance inputs, have low 8nVHz voltage noise and only 0.8pAHz current noise. An example of DC error calculations, using the MAX4100/MAX4101 typical data and the typical operating circuit with RF = RG = 200 (RS = 100), gives: R VOUT = IOSRS + VOS 1 + F RG
0.1M
1M
10M FREQUENCY (Hz)
100M
1G
Figure 4a. MAX4100 Bandwidth vs. Capacitive Load
(
)
VOUT = 3 x 10 -6 x 102 + 1 x 10 -3 1 + 1 VOUT = 2.6mV
()
CLOSED-LOOP GAIN (dB)
8 6 4 2 0 -2 -4 -6 -8 -10 0.1M
CL = 10pF
Calculating total output-referred noise in a similar manner yields: en(OUT) = 1 + 1 2 x 0.8 x 10 -12 x 100 + 8 x 10 -9 en(OUT) = 8nV / Hz With a 200MHz system bandwidth, this calculates to 133VRMS (approximately 679Vp-p).
()
2
2
RS = 22 RS = 10 RS = 4.7 RS = 2.2 1M 10M FREQUENCY (Hz) 100M 1G
Figure 4b. MAX4100 Bandwidth vs. Capacitive Load and Isolation Resistor
10
______________________________________________________________________________________
MAX4100-4b
10
MAX4100-4a
10
500MHz, Low-Power Op Amps MAX4100/MAX4101
Carbon composition resistors with leads are manufactured by pouring the resistor material into a mold. This process yields a relatively low-inductance resistor that is very useful in high-frequency applications, although they tend to cost more and have more thermal noise than other types. The ability of carbon composition resistors to self-heal after a large current overload makes them useful in high-power RF applications. For general-purpose use, surface-mount metal-film resistors seem to have the best overall performance for low cost, low inductance, and low noise.
24
RS
MAX4100
VIN CL RL
Driving Capacitive Loads
When driving 50 or 75 back-terminated transmission lines, capacitive loading is not an issue; therefore an isolation resistor is not required. For other applications where the ability to drive capacitive loads is required, the MAX4100/MAX4101 can typically drive 5pF and 20pF, respectively. Figure 4a illustrates how a capacitive load influences the amplifier's peaking without an isolation resistor (RS). Figure 4b shows how an isolation resistor decreases the amplifier's peaking. The MAX4100/MAX4101 can drive capacitive loads up to 5pF. By using a small isolation resistor between the amplifier output and the load, large capacitance values may be driven without oscillation (Figure 5a). In most cases, less than 50 is sufficient. Use Figure 5b to determine the value needed in your application. Determine the worst-case maximum capacitive load you may encounter and select the appropriate resistor from the graph.
Figure 5a. Using an Isolation Resistor for High Capacitive Loads (MAX4100)
DECOUPLING RESISTOR ()
20
MAX4100
15
10 5
MAX4101
0 0 20 40 60 80 100 120 CAPACITIVE LOAD (pF)
Figure 5b. Isolation vs. Capacitive Load
______________________________________________________________________________________
MAX4100 FIG05
25
11
500MHz, Low-Power Op Amps MAX4100/MAX4101
________________________________________________________Package Information
DIM INCHES MAX MIN 0.069 0.053 0.010 0.004 0.019 0.014 0.010 0.007 0.157 0.150 0.050 0.244 0.228 0.050 0.016 MILLIMETERS MIN MAX 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 3.80 4.00 1.27 5.80 6.20 0.40 1.27
D A e B
0.101mm 0.004in.
0-8
A1
C
L
A A1 B C E e H L
E
H
Narrow SO SMALL-OUTLINE PACKAGE (0.150 in.)
DIM PINS D D D 8 14 16
INCHES MILLIMETERS MIN MAX MIN MAX 0.189 0.197 4.80 5.00 0.337 0.344 8.55 8.75 0.386 0.394 9.80 10.00
21-0041A
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) 1995 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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