Ultra-Low-Distortion, Single-Supply,
300MHz Op Amps with Enable
5
4
4
3
3
2
C = 22pF
ISO
L
R
= 22Ω
C = 10pF
ISO
L
R
= 12Ω
C = 22pF
L
ISO
2
1
R
= 3.9Ω
C = 10pF
L
ISO
1
0
R
= 15Ω
0
-1
-2
-3
-4
C = 22pF
ISO
L
-1
-2
-3
R
= 6Ω
C = 10pF
ISO
L
R
= 18Ω
-4
-5
-5
-6
0.1M
1M
10M
FREQUENCY (Hz)
100M
1G
0.1M
1M
10M
FREQUENCY (Hz)
100M
1G
Figure 4b. MAX4269 Small-Signal Gain vs. Frequency With
Isolation Resistor
Figure 4c. MAX4270 Small-Signal Gain vs. Frequency With
Isolation Resistor
Power Supplies and Layout
The MAX4265–MAX4270 operate from a single +4.5V
to +8.0V power supply or from dual 2.25V to 4.0V
supplies. For single-supply operation, bypass each
power-supply input with a 0.1µF ceramic capacitor
Chip Information
TRANSISTOR COUNT: MAX4265/66/67: 132
MAX4268/69/70: 285
placed close to the V
pins, and an additional 10µF to
CC
V
. When operating from dual supplies, bypass each
EE
supply to ground.
Good layout improves performance by decreasing the
amount of stray capacitance and noise at the op amp’s
inputs and output. To decrease stray capacitance, min-
imize PC board trace lengths and resistor leads, and
place external components close to the op amp’s pins.
______________________________________________________________________________________ 13
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
