MAX4265ESA_99 Просмотр технического описания (PDF) - Maxim Integrated
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MAX4265ESA_99 Datasheet PDF : 16 Pages
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Ultra-Low-Distortion, Single-Supply,
300MHz Op Amps with Enable
MAX4265
MAX4266
MAX4267
8 µMAX/SO
1
—
2
—
3
—
4, 5
6
—
7, 8
—
PIN
MAX4268
MAX4269
MAX4270
14 SO
16 QSOP
—
—
4, 5
4, 5
—
—
2, 9
2, 11
—
—
3, 10
3, 12
6, 7
6, 7
—
—
1, 8
1, 10
13, 14
15, 16
11, 12
8, 9, 13, 14
NAME
EN
ENA, ENB
IN-
INA-, INB-
IN+
INA+, INB+
VEE
OUT
OUTA, OUTB
VCC
N.C.
Pin Description
FUNCTION
FUNCTION
Enable Input. Active high. Connect to VCC for normal operation.
Enable Input. Active high. Connect to VCC for normal operation.
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 and
bypass with a 0.1µF capacitor for single-supply operation.
No Connection. Not internally connected.
_______________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
from (VEE + 1.6V) to (VCC - 1.6V), while the output
swings to within 1.1V of the rails.
Low Distortion
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).
• 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.
• 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.
10 ______________________________________________________________________________________
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