MAXIM MAX4102ESA

19-0471; Rev 0; 2/96
250MHz, Broadcast-Quality, Low-Power
Video Op Amps
The MAX4102/MAX4103 op amps combine high-speed
performance and ultra-low differential gain and phase
while drawing only 5mA of supply current. The
MAX4102 is compensated for unity-gain stability, while
the MAX4103 is compensated for a closed-loop gain
(AVCL) of 2V/V or greater.
The MAX4102/MAX4103 deliver a 250MHz -3dB bandwidth
(MAX4102) or a 180MHz -3dB bandwidth (MAX4103).
Differential gain and phase are an ultra-low 0.002%/0.002°
(MAX4102) and 0.008%/0.003° (MAX4103), making these
amplifiers ideal for composite video applications.
These high-speed op amps have a wide output voltage
swing of ±3.4V (RL = 100Ω) and 80mA current-drive
capability.
____________________________Features
♦ 250MHz -3dB Bandwidth (MAX4102)
180MHz -3dB Bandwidth (MAX4103)
♦ Unity-Gain Stable (MAX4102)
♦ 350V/µs Slew Rate
♦ Lowest Differential Gain/Phase (RL = 150Ω)
MAX4102: 0.002%/0.002°
MAX4103: 0.008%/0.003°
♦ Low Distortion (SFDR 5MHz): -78dBc
♦ 100dB Open-Loop Gain
♦ High Output Drive: 80mA
♦ Low Power: 5mA Supply Current
________________________Applications
Broadcast and High-Definition TV Systems
______________Ordering Information
Pulse/RF Amplifier
PART
ADC/DAC Amplifier
MAX4102ESA
MAX4103ESA
________Typical Application Circuit
TEMP. RANGE
PIN-PACKAGE
-40°C to +85°C
-40°C to +85°C
8 SO
8 SO
__________________Pin Configuration
TOP VIEW
INPUT
75Ω
MAX4102
MAX4103
N.C. 1
8
N.C.
7
VCC
IN+ 3
6
OUT
VEE 4
5
N.C.
75Ω
IN- 2
390Ω
390Ω
MAX4102
MAX4103
SO
VIDEO CABLE DRIVER
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
MAX4102/MAX4103
_______________General Description
MAX4102/MAX4103
250MHz, Broadcast-Quality, Low-Power
Video Op Amps
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC to VEE) ..................................................12V
Voltage on Any Pin to Ground or Any Other Pin .........VCC to VEE
Short-Circuit Duration (VOUT to GND)........................Continuous
Continuous Power Dissipation (TA = +70°C)
SO (derate 5.88mW/°C above +70°C) .........................471mW
Operating Temperature Range
MAX4102ESA/MAX4103ESA ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+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.
DC ELECTRICAL CHARACTERISTICS
(VCC = 5V, VEE = -5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
8
mV
DC SPECIFICATIONS
Input Offset Voltage
Input Offset Voltage Drift
Input Bias Current
Input Offset Current
VOS
VOUT = 0V
0.5
TCVOS
VOUT = 0V
5
IB
VOUT = 0V, VIN = -VOS
3
9
µV/°C
µA
IOS
VOUT = 0V, VIN = -VOS
0.04
0.5
µA
Common-Mode Input Resistance
RINCM
Either input
5
MΩ
Common-Mode Input Capacitance
CINCM
Either input
1
pF
Input Voltage Noise
en
Integrated Voltage Noise
Input Current Noise
f = 100kHz
f = 1MHz to 100MHz
in
Integrated Current Noise
f = 100kHz
f = 1MHz to 100MHz
Common-Mode Input Voltage
VCM
Common-Mode Rejection
CMR
VCM = ±2.5V
Power-Supply Rejection
PSR
VS = ±4.5V to ±5.5V
Open-Loop Voltage Gain
AVOL
Quiescent Supply Current
ISY
Output Voltage Swing
VOUT
Output Current
Short-Circuit Output Current
2
MAX4102
7
MAX4103
5
MAX4102
88
MAX4103
63
MAX4102
1.0
MAX4103
1.0
MAX4102
12.5
MAX4103
12.5
-2.5
nARMS
2.5
V
dB
dB
100
66
96
RL = 100Ω
70
100
RL = ∞
±3.3
±3.7
RL = 100Ω
±3.1
±3.4
VIN = 0V
Short to ground or either supply voltage
pA/√Hz
100
70
RL = 30Ω, TA = 0°C to +85°C
ISC
µVRMS
75
RL = ∞
VOUT = ±2.0V, VCM = 0V
nV/√Hz
4.6
65
dB
6
mA
V
80
mA
90
mA
_______________________________________________________________________________________
250MHz, Broadcast-Quality, Low-Power
Video Op Amps
(VCC = 5V, VEE = -5V, RL = 100Ω, AVCL = +1 (MAX4102), AVCL = +2 (MAX4103), TA = +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
AC SPECIFICATIONS
-3dB Bandwidth
VOUT ≤ 0.1VRMS
BW
0.1dB Bandwidth
Slew Rate
250
MAX4103
180
MAX4102
130
MAX4103
80
-2V ≤ VOUT ≤ 2V
SR
Settling Time
MAX4102
MHz
350
-1V ≤ VOUT ≤ 1V
ts
MHz
to 0.1%
18
to 0.01%
30
10% to 90%, -2V ≤ VOUT ≤ 2V
13
10% to 90%, -50mV ≤ VOUT ≤ 50mV
1.5
V/µs
ns
Rise/Fall Times
tR, tF
ns
Differential Gain
DG
f = 3.58MHz,
RL = 150Ω
MAX4102
0.002
MAX4103
0.008
Differential Phase
DP
f = 3.58MHz,
RL = 150Ω
MAX4102
0.002
MAX4103
0.003
Input Capacitance
CIN
MAX4102
0.7
MAX4103
0.7
MAX4102
-78
MAX4103
-76
%
degrees
2
Output Resistance
ROUT
f = 10MHz
Spurious-Free Dynamic Range
SFDR
fC = 5MHz,
VOUT = 2Vp-p
pF
Ω
dBc
__________________________________________Typical Operating Characteristics
(VCC = 5V, VEE = -5V, RL = 100Ω, TA = +25°C, unless otherwise noted.)
MAX4103
DIFFERENTIAL GAIN AND PHASE
IRE
0.004
0.002
0.000
-0.002
-0.004
-0.006
RL = 150Ω
AVCL = 1V/V
0
100
IRE
100
-0.002
RL = 150Ω
-0.004 A
VCL = 2V/V
-0.006
0
RL = 75Ω
AVCL = 1V/V
0
IRE
0.004
0.002
0.000
MAX4102/03-03
MAX4102/03-02
0
100
DIFF PHASE (deg)
DIFF PHASE (deg)
0
RL = 150Ω
AVCL = 2V/V
0.004
0.002
0.000
-0.002
-0.004
-0.006
-0.008
-0.010
DIFF GAIN (%)
RL = 150Ω
AVCL = 1V/V
MAX4102
DIFFERENTIAL GAIN AND PHASE
DIFF PHASE (deg)
-0.002
-0.004
-0.006
0.004
0.002
0.000
-0.002
-0.004
-0.006
-0.008
-0.010
DIFF GAIN (%)
0.004
0.002
0.000
MAX4102/03-01
DIFF GAIN (%)
MAX4102
DIFFERENTIAL GAIN AND PHASE
100
IRE
0.015
RL = 75Ω
0.010
AVCL = 1V/V
0.005
0.000
-0.005
-0.010
100
IRE
0
100
IRE
_______________________________________________________________________________________
3
MAX4102/MAX4103
AC ELECTRICAL CHARACTERISTICS
250MHz, Broadcast-Quality, Low-Power
Video Op Amps
MAX4102/MAX4103
____________________________Typical Operating Characteristics (continued)
(VCC = 5V, VEE = -5V, RL = 100Ω, TA = +25°C, unless otherwise noted.)
MAX4102
SMALL-SIGNAL GAIN vs. FREQUENCY
(AVCL = +1)
IRE
DIFF PHASE (deg)
0.020
0.015
0.010
0.005
0.000
-0.005
-0.010
2
1
0
-1
-2
RL = 75Ω
AVCL = 2V/V
-2
-3
-4
-4
-5
-5
-6
-6
0.1M
100
1M
10M
100M
1G
0.1M
FREQUENCY (Hz)
IRE
MAX4102/03-07
200
100
0
-100
100M
-100
1G
MAX4102
SMALL-SIGNAL
PULSE RESPONSE (AVCL = +5)
MAX4102/03-10
IN
GND
OUT
GND
VOLTAGE (25mv/div)
0
10M
MAX4102/03-09
200
PHASE (degrees)
100
1M
FREQUENCY (Hz)
MAX4102
SMALL-SIGNAL
PULSE RESPONSE (AVCL = +1)
MAX4102/MAX4103
OPEN-LOOP GAIN
AND PHASE vs. FREQUENCY
IN
GND
GND
OUT
-200
-200
-300
-300
1
100
10k
1M
100M
TIME (10ns/div)
1G
TIME (20ns/div)
FREQUENCY (Hz)
MAX4102
LARGE-SIGNAL
PULSE RESPONSE (AVCL = +5)
MAX4102
LARGE-SIGNAL
PULSE RESPONSE (AVCL = +1)
OUT
GND
4
IN
MAX4102/03-13
GND
GND
OUT
TIME (20ns/div)
IN
VOLTAGE (25mv/div)
GND
VOLTAGE (500mv/div)
IN
TIME (10ns/div)
MAX4103
SMALL-SIGNAL
PULSE RESPONSE (AVCL = +2)
MAX4102/03-12
MAX4102/03-11
VOLTAGE (500mv/div)
GAIN (dB)
0
-1
-3
0
MAX4102/03-06
2
1
GAIN (dB)
100
0
4
3
VOLTAGE (25mv/div)
-0.015
-0.020
RL = 75Ω
AVCL = 2V/V
3
GAIN (dB)
-0.005
-0.010
4
MAX4103
SMALL-SIGNAL GAIN vs. FREQUENCY
(AVCL = +2)
MAX4102/03-05
0.005
0.000
MAX4102/03-04
DIFF GAIN (%)
MAX4103
DIFFERENTIAL GAIN AND PHASE
GND
GND
OUT
TIME (10ns/div)
_______________________________________________________________________________________
250MHz, Broadcast-Quality, Low-Power
Video Op Amps
GND
OUT
MAX4102
DISTORTION vs. FREQUENCY
(AVCL = +1)
3RD HARMONIC
-100
-110
1
10
MAX4102/03-18
VOUT = 2Vp-p
RL = 100Ω
AVCL = +1
0.1
0.01
-40
2ND HARMONIC
-70
-80
3RD HARMONIC
-90
-100
100
-110
0.1
1
10
0.1
100
1
10
FREQUENCY (MHz)
MAX4103
DISTORTION vs. FREQUENCY
(AVCL = +5)
MAX4103
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
MAX4102
5MHz DISTORTION vs. LOAD
-70
-80
3RD HARMONIC
-100
-110
0.1
0.01
1
10
100
fOUT = 5MHz
VOUT = 2Vp-p
AVCL = +1
-50
-60
-70
2ND HARMONIC
-80
-90
3RD HARMONIC
-100
0.001
FREQUENCY (MHz)
-40
100
MAX4102/03-22
MAX4102/03-21
VOUT = 2Vp-p
RL = 100Ω
AVCL = +2
HARMONIC DISTORTION (dBc)
2ND HARMONIC
1
TOTAL HARMONIC DISTORTION (%)
MAX4102/03-20
-60
0.1
-60
FREQUENCY (MHz)
VOUT = 2Vp-p
RL = 100Ω
-90
VOUT = 2Vp-p
RL = 100Ω
-50
FREQUENCY (MHz)
-40
HARMONIC DISTORTION (dBc)
MAX4103
DISTORTION vs. FREQUENCY
(AVCL = +2)
0.001
0.1
-50
TIME (20ns/div)
HARMONIC DISTORTION (dBc)
-80
1
TOTAL HARMONIC DISTORTION (%)
MAX4102/03-17
HARMONIC DISTORTION (dBc)
2ND HARMONIC
-90
GND
OUT
MAX4102
TOTAL HARMONIC DISTORTION
vs. FREQUENCY
-60
-70
GND
TIME (10ns/div)
TIME (20ns/div)
-50
IN
GND
MAX4102/03-19
GND
OUT
IN
VOLTAGE (500mv/div)
GND
VOLTAGE (500mv/div)
VOLTAGE (25mv/div)
IN
VOUT = 2Vp-p
RL = 100Ω
MAX4102/03-16
MAX4102/03-15
MAX4102/03-14
-40
MAX4103
LARGE-SIGNAL
PULSE RESPONSE (AVCL = +10)
MAX4103
LARGE-SIGNAL
PULSE RESPONSE (AVCL = +2)
MAX4103
SMALL-SIGNAL
PULSE RESPONSE (AVCL = +10)
0.1
1
10
FREQUENCY (MHz)
100
10
100
1k
LOAD (Ω)
_______________________________________________________________________________________
5
MAX4102/MAX4103
____________________________Typical Operating Characteristics (continued)
(VCC = 5V, VEE = -5V, RL = 100Ω, TA = +25°C, unless otherwise noted.)
____________________________Typical Operating Characteristics (continued)
(VCC = 5V, VEE = -5V, RL = 100Ω, TA = +25°C, unless otherwise noted.)
-70
2ND HARMONIC
-80
-90
3RD HARMONIC
-100
-50
-60
-70
2ND HARMONIC
-80
3RD HARMONIC
-90
1k
1
INPUT VOLTAGE NOISE
vs. FREQUENCY
NOISE (pA/√Hz)
10
-80
3RD HARMONIC
-90
1
10
OUTPUT SWING (Vp-p)
INPUT CURRENT NOISE
vs. FREQUENCY
POWER-SUPPLY
REJECTION vs. FREQUENCY
MAX4102/03-27
10
MAX4102/03-26
MAX4102
2ND HARMONIC
-70
OUTPUT SWING (Vp-p)
LOAD (Ω)
100
-60
10
5
MAX4103
100
POWER-SUPPLY REJECTION (dB)
100
fOUT = 5MHz
RL = 100Ω
AVCL = +2
-50
-100
-100
10
VOLTAGE NOISE (nV/√Hz)
-40
MAX4102/03-25
fOUT = 5MHz
RL = 100Ω
AVCL = +1
HARMONIC DISTORTION (dBc)
-60
-40
MAX4102/03-24
MAX4102/03-23
fOUT = 5MHz
VOUT = 2Vp-p
AVCL = +2
HARMONIC DISTORTION (dBc)
HARMONIC DISTORTION (dBc)
-40
-50
MAX4103
5MHz DISTORTION vs. OUTPUT SWING
MAX4102
5MHz DISTORTION vs. OUTPUT SWING
MAX4102/03-28
MAX4103
5MHz DISTORTION vs. LOAD
90
80
70
60
50
40
30
20
10
1
1
10
1k
100
10k
10
1k
100
10k
100k
0.2M
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
COMMON-MODE REJECTION
OUTPUT RESISTANCE
vs. FREQUENCY
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
OUTPUT IMPEDANCE (Ω)
70
60
MAX4103
50
40
MAX4102
0.55
16.5
13.3
10.2
7.0
3.9
0.7
10
0.4
10M
FREQUENCY (Hz)
100M
1G
0.50
0.45
0.40
0.35
0
1M
0.60
19.7
20
0
0.03M 0.1M
0.65
1G
MAX4102/03-31
80
22.8
VOLTAGE (mV)
90
30
26.0
MAX4102/03-29
100
6
0
1
100k
MAX4102/03-30
1
COMMON-MODE REJECTION (dB)
MAX4102/MAX4103
250MHz, Broadcast-Quality, Low-Power
Video Op Amps
0.30
0.1M
1M
10M
100M
FREQUENCY (Hz)
1G
-75 -50
-25
0
25
50
75
TEMPERATURE (°C)
_______________________________________________________________________________________
100 125
250MHz, Broadcast-Quality, Low-Power
Video Op Amps
OUTPUT SWING
vs. LOAD RESISTANCE
0.040
0.035
0.030
0.025
3.0
2.5
2.0
1.5
1.0
-25
0
25
50
75
10
100 125
3.6
3.5
RL = 100Ω
3.4
3.2
0
-75 -50
RL = ∞
3.7
3.3
0.5
0.020
30
50
70
90
110
130
-75 -50 -25
150
0
25
75
50
TEMPERATURE (°C)
LOAD RESISTANCE (Ω)
TEMPERATURE (°C)
NEGATIVE OUTPUT SWING
vs. TEMPERATURE
POWER-SUPPLY CURRENT
vs. TEMPERATURE
INPUT BIAS CURRENT
vs. TEMPERATURE
CURRENT (mA)
-3.5
-3.6
RL = ∞
-3.7
MAX4102/03-37
6
RL = 100Ω
-3.4
7
CURRENT (µA)
-3.3
100 125
8
MAX4102/03-36
6
MAX4102/03-35
-3.2
OUTPUT SWING (Vp-p)
3.8
OUTPUT SWING (Vp-p)
0.045
3.9
MAX4102/03-33
3.5
OUTPUT SWING (Vp-p)
0.050
CURRENT (µA)
4.0
MAX4102/03-32
0.055
POSITIVE OUTPUT SWING
vs. TEMPERATURE
MAX4102/03-34
INPUT OFFSET CURRENT
vs. TEMPERATURE
5
4
5
4
3
2
-3.8
-3.9
1
3
-75 -50 -25
0
25
50
75
TEMPERATURE (°C)
100 125
-75 -50 -25
0
25
50
75
TEMPERATURE (°C)
100 125
-75 -50 -25
0
25
50
75
100 125
TEMPERATURE (°C)
_______________________________________________________________________________________
7
MAX4102/MAX4103
____________________________Typical Operating Characteristics (continued)
(VCC = 5V, VEE = -5V, RL = 100Ω, TA = +25°C, unless otherwise noted.)
MAX4102/MAX4103
250MHz, Broadcast-Quality, Low-Power
Video Op Amps
_____________________Pin Description
PIN
NAME
1
N.C.
FUNCTION
Not internally connected
2
IN-
Inverting Input
3
IN+
Noninverting Input
4
VEE
Negative Power Supply. Connect
to -5V
5
N.C.
Not internally connected
6
OUT
Amplifier Output
7
VCC
Positive Power Supply. Connect
to +5V
8
N.C.
Not internally connected
_______________Detailed Description
The MAX4102/MAX4103 low-power, high-speed op
amps feature ultra-low differential gain and phase, and
are optimized for the highest quality video applications.
Differential gain and phase errors are 0.002%/0.002°
for the MAX4102 and 0.008%/0.003° for the MAX4103.
The MAX4102 also features a -3dB bandwidth of over
250MHz and 0.1dB gain-flatness of 130MHz. The
MAX4103 features a -3dB bandwidth of 180MHz and a
0.1dB bandwidth of 80MHz.
The MAX4102 is unity-gain stable, and the MAX4103 is
optimized for closed-loop gains of 2V/V (6dB) and higher.
Both devices drive back-terminated 50Ω or 75Ω cables to
±3.1V (min) and deliver an output current of 80mA.
Available in a small 8-pin SO package, the MAX4102/
MAX4103 are ideal for high-definition TV systems (in
RGB, broadcast, or consumer video applications) that
benefit from low power consumption and superior differential gain and phase characteristics.
__________Applications Information
Grounding, Bypassing,
and PC Board Layout
In order to achieve the full bandwidth, Microstrip and
Stripline techniques are recommended in most cases.
To ensure your PC board does not degrade the amp’s
performance, it’s wise to design the board for a frequency greater than 1GHz. Even with very short runs,
it’s good practice to use this technique at critical
points, such as inputs and outputs. Whether you use a
constant-impedance board or not, observe the following guidelines when designing the board:
8
• Do not use wire-wrap boards, because they are too
inductive.
• Do not use IC sockets. They increase parasitic
capacitance and inductance.
• In general, surface-mount components have shorter
leads and lower parasitic reactance, and give better
high-frequency performance than through-hole components.
• The PC board should have at least two layers, with
one side a signal layer and the other a ground plane.
• Keep signal lines as short and as straight as possible. Do not make 90° turns; round all corners.
• The ground plane should be as free from voids as
possible.
On Maxim’s evaluation kit, the ground plane has been
removed from areas where keeping the trace capacitance to a minimum is more important than maintaining
ground continuity. For example, the ground plane has
been removed from beneath the IC to minimize pin
capacitance.
The bypass capacitors should include a 0.1µF at each
supply pin and the ground plane, located as close to the
package as possible. Then place a 10µF to 15µF lowESR 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 maintain the low differential gain and phase
of these devices.
Setting Gain
The MAX4102/MAX4103 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 (Figure 1c), maximum
bandwidth and stability are achieved with the MAX4102
when a small feedback resistor is included. This resistor suppresses the negative effects of parasitic inductance and capacitance. A value of 24Ω provides the
best combination of wide bandwidth, low peaking, and
fast settling time. In addition, this resistor reduces the
errors from input bias currents.
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), but should be kept small and noninductive.
_______________________________________________________________________________________
250MHz, Broadcast-Quality, Low-Power
Video Op Amps
RG
VIN
RF
RT
VOUT
MAX4100
MAX4102
MAX4101
MAX4103
Table 1. Resistor and Bandwidth Values
for Various Gain Configurations
DEVICE
GAIN
(V/V)
RG
(Ω)
RF
(Ω)
RT
(Ω)
BANDWIDTH
(MHz)
MAX4102
1
∞
24
50
250
MAX4102
2
200
200
50
100
MAX4103
2
200
200
50
180
MAX4103
5
50
200
50
40
MAX4103
10
30
270
50
20
MAX4103
-1
200
200
56
180
MAX4103
-2
75
150
150
140
MAX4103
-5
50
250
∞
75
MAX4103
-10
50
500
∞
35
Note: Refer to Figure 1a for inverting gain configurations and
Figure 1b for noninverting gain configurations. RT is calculated
for 50Ω systems.
VOUT = -(RF / RG)VIN
Figure 1a. Inverting Gain Configuration
RG
MAX4102/MAX4103
The input capacitance of the MAX4102/MAX4103 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 / (2Π 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. RS1 and RS2 represent the input
termination resistors. Table 1 shows the typical bandwidth and resistor values for several gain configurations.
Resistor Types
RF
VOUT
MAX4100
MAX4102
MAX4101
MAX4103
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.
VIN
VOUT = [1 + (RF / RG)]VIN
RT
RG
VIN
Figure 1b. Noninverting Gain Configuration
RS1
C
24Ω
MAX4100
MAX4102
MAX4101
MAX4103
RF
VOUT
MAX4100
MAX4102
MAX4101
MAX4103
VOUT
RS2
VIN
VOUT = VIN
Figure 1c. MAX4102 Unity-Gain Buffer Configuration
Figure 2. Effect of Feedback Resistor Values and Parasitic
Capacitance on Bandwidth
_______________________________________________________________________________________
9
Driving Capacitive Loads
When driving 50Ω or 75Ω back-terminated transmission
lines, capacitive loading is not an issue. The MAX4102/
MAX4103 can typically drive 5pF and 20pF, respectively.
Figure 3a illustrates how a capacitive load influences the
amplifier’s peaking without an isolation resistor (R S).
Figure 3b shows how an isolation resistor decreases the
amplifier’s peaking. By using a small isolation resistor
between the amplifier output and the load, large capacitance values may be driven without oscillation (Figure
4a). In most cases, less than 50Ω is sufficient. Use Figure
4b 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.
6
4
AVCL = +1
5
CL = 15pF
RS = 22Ω
2
3
1
GAIN (dB)
CL = 10pF
2
1
0
CL = 5pF
-1
RS = 10Ω
CL = 10pF
3
4
GAIN (dB)
0
-1
RS = 33Ω
-2
-3
-2
-4
-3
-5
-4
-6
0.1M
1M
10M
100M
1G
0.1M
1M
FREQUENCY (Hz)
10M
100M
1G
FREQUENCY (Hz)
Figure 3b. MAX4102 Bandwidth vs. 10pF Capacitive Load and
Isolation Resistor
Figure 3a. MAX4102 Bandwidth vs. Capacitive Load
(No Isolation Resistor (RS))
40
24Ω
RS
MAX4102
VIN
CL
RL
ISOLATION RESISTANCE (Ω)
MAX4102/MAX4103
250MHz, Broadcast-Quality, Low-Power
Video Op Amps
35
MAX4102
30
25
20
MAX4103
15
10
5
0
50
100
150
CAPACITIVE LOAD (pF)
Figure 4a. Using an Isolation Resistor (RS) for Large Capacitive
Loads (MAX4102)
10
Figure 4b. Isolation vs. Capacitive Load
______________________________________________________________________________________
200
250
250MHz, Broadcast-Quality, Low-Power
Video Op Amps
DIM
D
0°-8°
A
0.101mm
0.004in.
e
B
A1
E
C
H
L
Narrow SO
SMALL-OUTLINE
PACKAGE
(0.150 in.)
A
A1
B
C
E
e
H
L
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
DIM PINS
D
D
D
8
14
16
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
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
___________________Chip Information
TRANSISTOR COUNT: 51
SUBSTRATE CONNECTED TO: VEE
______________________________________________________________________________________
11
MAX4102/MAX4103
________________________________________________________Package Information
MAX4102/MAX4103
250MHz, Broadcast-Quality, Low-Power
Video Op Amps
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
© 1996 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.