Datasheet

Setting Gain
The MAX4448/MAX4449 are stable with minimum gain
of +2V/V and +5V/V, respectively. An external resistor,
R
GAIN
, connected between RG and GND sets the gain
of these devices. Calculate the gain as follows:
Gain = 2 (1 + 300 / R
GAIN
)
R
GAIN
for the MAX4449 must be ≤200Ω.
Driving Capacitive Loads
The MAX4447/MAX4448/MAX4449 are designed to
drive capacitive loads. However, excessive capacitive
loads may cause ringing or instability at the output as
phase margin is reduced. Adding a small series isola-
tion resistor at the output helps reduce the ringing but
slightly increases gain error.
Twisted-Pair Line Driver
The MAX4447/MAX4448/MAX4449 are well-suited to
drive twisted-pair cables. The 24AWG telephone wire
widely used produces losses at the higher frequencies.
Compensate for these losses by increasing the gain
slightly.
MAX4447/MAX4448/MAX4449
6500V/µs, Wideband, High-Output-Current, Single-
Ended-to-Differential Line Drivers with Enable
______________________________________________________________________________________ 11
IN
500mV/div
OUT
1V/div
C
L
= 15pF
IN
500mV/div
OUT
1V/div
C
L
= 15pF
Figure 3. Capacitive-Loaded Output Step Response Without
Isolation Resistor
Figure 4. Capacitive-Loaded Output Step Response with 14Ω
Isolation Resistor
Chip Information
TRANSISTOR COUNT: 291