MAX4265–MAX4270
Ultra-Low-Distortion, +5V,
400MHz Op Amps with Disable
12 ______________________________________________________________________________________
Pin Description
Detailed Description
The MAX4265–MAX4270 family of operational ampli-
fiers features ultra-low distortion and wide bandwidth.
Their low distortion and low noise make them ideal for
driving high-speed ADCs up to 16 bits in telecommuni-
cations applications and high-performance signal pro-
cessing.
These devices can drive a 100Ω load and deliver 45mA
while maintaining DC accuracy and AC performance.
The input common-mode voltage ranges from (V
EE
+
1.6V) to (V
CC
- 1.6V), while the output typically swings
to within 1.1V of the rails.
Low Distortion
The MAX4265–MAX4270 use proprietary bipolar tech-
nology to achieve minimum distortion in low-voltage
systems. This feature is typically available only in dual-
supply op amps.
Several factors can affect the noise and distortion that a
device contributes to the input signal. The following
guidelines explain how various design choices impact
the total harmonic distortion (THD):
• Choose the proper feedback-resistor and gain-resis-
tor values for the application. In general, the smaller
the closed-loop gain, the smaller the THD generated,
especially when driving heavy resistive loads. Large-
value feedback resistors can significantly improve
distortion. The MAX4265–MAX4270’s THD normally
increases at approximately 20dB per decade at fre-
quencies above 1MHz; this is a lower rate than that of
comparable dual-supply op amps.
• Operating the device near or above the full-power
bandwidth significantly degrades distortion (see the
Total Harmonic Distortion vs. Frequency graph in the
Typical Operating Characteristics).
• The decompensated devices (MAX4266/MAX4267/
MAX4269/MAX4270) deliver the best distortion per-
formance since they have a slightly higher slew rate
and provide a higher amount of loop gain for a given
closed-loop gain setting.
PIN
MAX4265
MAX4266
MAX4267
NAME
MAX4268
MAX4269
MAX4270
Disable Input. Active low.
Inverting Input
Inverting Input
Noninverting Input
Noninverting Input
Negative Power Supply
Amplifier Output
Amplifier Output
Positive Power Supply. Connect to a +4.5V to +8.0V supply.
No Connection. Not internally connected.
1, 10
15, 16
8, 9, 13, 14
—
3, 12
6, 7
—
2, 11
—
4, 5
—
OUTA, OUTB1, 8—
V
CC
13, 147, 8
N.C.11, 12—
IN+—3
INA+, INB+3, 10—
V
EE
6, 74, 5
OUT—6
INA-, INB-2, 9—
IN-—2
8 µMAX/SO
DISABLEA, DISABLEB
4, 5—
DISABLE
—1
14 SO
FUNCTION
Disable Input. Active low.
16 QSOP
