MAX4384 Maxim, MAX4384 Datasheet - Page 11

• Manufacturer Part Number: MAX4384
• Description: The MAX4380–MAX4384 family of op amps are unity-gain-stable devices that combine high-speed performance, rail-to-rail outputs, and high-impedance disable mode
• Manufacturer: Maxim

Figure 1a. Noninverting Gain Configuration
Figure 1b. Inverting Gain Configuration
have a 16ns settling time to 0.1%, 485V/µs slew rates,
and output-current-drive capability of up to 75mA
making them ideal for driving video loads.
Select the gain-setting feedback (R
resistor values to fit your application. Large resistor val-
ues increase voltage noise and interact with the ampli-
fier’s input and PC board capacitance. This can
generate undesirable poles and zeros and decrease
bandwidth or cause oscillations. For example, a nonin-
verting gain-of-two configuration (R
resistors, combined with 1pF of amplifier input capaci-
tance and 1pF of PC board capacitance, causes a
pole at 159MHz. Since this pole is within the amplifier
bandwidth, it jeopardizes stability. Reducing the 1k
resistors to 100
1.59GHz, but could limit output swing by adding 200
in parallel with the amplifier’s load resistor
(Figures 1a and 1b).
These amplifiers operate from a single +4.5V to +11V
power supply or from dual ±2.25V to ±5.5V supplies. For
Op Amps with Rail-to-Rail Outputs and Disable
Ultra-Small, Low-Cost, 210MHz, Single-Supply
Layout and Power-Supply Bypassing
IN
Inverting and Noninverting Configurations
R
R
G
IN
G
______________________________________________________________________________________
extends the pole frequency to
MAX438 _
MAX438 _
V
R
R
OUT
F
F
V
OUT
= -(R
= [1+ (R
F
/ R
F
F
G
= R
) and input (R
) V
F
V
V
OUT
/ R
OUT
IN
G
G
)] V
) using 1k
IN
G
)
single-supply operation, bypass V
0.1µF capacitor as close to the pin as possible. If operat-
ing with dual supplies, bypass each supply with a 0.1µF
capacitor.
Maxim recommends using microstrip and stripline
techniques to obtain full bandwidth. To ensure that the
PC board does not degrade the amplifier’s perfor-
mance, design it for a frequency greater than 1GHz.
Pay careful attention to inputs and outputs to avoid
large parasitic capacitance. Whether or not you use a
constant-impedance board, observe the following
design guidelines:
• Don’t use wire-wrap boards; they are too inductive.
• Don’t use IC sockets; they increase parasitic capaci-
• Use surface-mount instead of through-hole compo-
• Use a PC board with at least two layers; it should be
• Keep signal lines as short and as straight as possi-
For +5V single-supply operation, the input common-
mode range extends from (V
- 2.25V) with excellent common-mode rejection.
Beyond this range, the amplifier output is a nonlinear
function of the input, but does not undergo phase
reversal or latchup.
For ±5V dual-supply operation, the common-mode
range is from V
For +5V single-supply operation the output swings to
within 50mV of either power-supply rail with a 2k
load. The input ground sensing and the rail-to-rail out-
put substantially increase the dynamic range. With a
symmetric input in a single +5V application, the input
can swing 2.95Vp-p and the output can swing 4.9Vp-p
with minimal distortion.
The disable feature (DISABLE_) allows the amplifier to
be placed in a low-power, high-output-impedance
state. When the disable pin (DISABLE_) is active, the
amplifier’s output impedance is 35k . This high resis-
tance and the low 2pF output capacitance make the
MAX4380–MAX4382 and the MAX4384 ideal in
RF/video multiplexer or switch applications. For larger
arrays, pay careful attention to capacitive loading.
Refer to the Output Capacitive Loading and Stability
section.
tance and inductance.
nents for better high-frequency performance.
as free from voids as possible.
ble. Do not make 90° turns; round all corners.
EE
to (V
CC
Low-Power Disable Mode
Ground-Sensing Inputs
- 2.25V)
Rail-to-Rail Outputs,
EE
CC
- 200mV) to (V
to ground with a
CC
11