Ultra-Low-Distortion, Single-Supply,
300MHz Op Amps with Enable
Pin Description
PIN
MAX4265
MAX4266
MAX4267
MAX4268
MAX4269
MAX4270
NAME
FUNCTION
FUNCTION
8 µMAX/SO
14 SO
16 QSOP
—
1
—
2
—
4, 5
—
EN
ENA, ENB
IN-
Enable Input. Active high. Connect to V
Enable Input. Active high. Connect to V
Inverting Input
for normal operation.
for normal operation.
CC
4, 5
—
CC
—
3
2, 9
—
2, 11
—
INA-, INB-
IN+
Inverting Input
Noninverting Input
—
4, 5
6
3, 10
6, 7
—
3, 12
6, 7
—
INA+, INB+
Noninverting Input
V
EE
Negative Power Supply
Amplifier Output
OUT
—
1, 8
1, 10
OUTA, OUTB
Amplifier Output
Positive Power Supply. Connect to a +4.5V to +8.0V supply and
bypass with a 0.1µF capacitor for single-supply operation.
7, 8
—
13, 14
11, 12
15, 16
V
CC
8, 9, 13, 14
N.C.
No Connection. Not internally connected.
• 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 generat-
ed—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 frequencies above 1MHz; this is a lower
rate than that of comparable dual-supply op amps.
_______________Detailed Description
The MAX4265–MAX4270 single-supply operational
amplifiers feature ultra-low distortion and wide band-
width. Their low distortion and low noise make them
ideal for driving high-speed analog-to-digital converters
(ADCs) up to 16 bits in telecommunications applica-
tions and high-performance signal processing.
These devices can drive loads as low as 100Ω and
deliver 45mA while maintaining DC accuracy and AC
performance. The input common-mode voltage ranges
• 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).
from (V
+ 1.6V) to (V
- 1.6V), while the output
CC
EE
swings to within 1.1V of the rails.
Low Distortion
• 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.
The MAX4265–MAX4270 use proprietary bipolar tech-
nology to achieve minimum distortion in single-supply
systems—a feature typically available only in dual-sup-
ply 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).
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