Datasheet

MAX4464/MAX4470/MAX4471/MAX4472/MAX4474
Single/Dual/Quad, +1.8V/750nA, SC70,
Rail-to-Rail Op Amps
10 ______________________________________________________________________________________
R1
2pF TO 10pF
R2
V
IN
V
CC
V
SS
MAX44_ _
Figure 1. Compensation for Feedback Node Capacitance
Applications Information
Ground Sensing
The common-mode input range of the MAX4470 family
extends down to ground, and offers excellent common-
mode rejection. These devices are guaranteed not to
undergo phase reversal when the input is overdriven.
Power Supplies and Layout
The MAX4470 family operates from a single +1.8V to
+5.5V power supply. Bypass power supplies with a
0.1µF ceramic capacitor placed close to the V
DD
pin.
Ground layout improves performance by decreasing the
amount of stray capacitance and noise at the op amp’s
inputs and outputs. To decrease stray capacitance, mini-
mize PC board lengths and resistor leads, and place
external components close to the op amps’ pins.
Bandwidth
The MAX4470/MAX4471/MAX4472 are internally
compensated for unity-gain stability and have a typical
gain-bandwidth of 9kHz. The MAX4464/MAX4474 have
a 40kHz typical gain-bandwidth and are stable for a
gain of +5V/V or greater.
Stability
The MAX4464/MAX4470/MAX4471/MAX4472/MAX4474
maintain stability in their minimum gain configuration
while driving capacitive loads. Although this product
family is primarily designed for low-frequency applica-
tions, good layout is extremely important because low-
power requirements demand high-impedance circuits.
The layout should also minimize stray capacitance at the
amplifier inputs. However some stray capacitance may
be unavoidable, and it may be necessary to add a 2pF
to 10pF capacitor across the feedback resistor as shown
in Figure 1. Select the smallest capacitor value that
ensures stability.
Pin Description (continued)
PIN
MAX4464/
MAX4470
MAX4470
(WLP)
MAX4471/
MAX4474
MAX4472
NAME FUNCTION
—
—
1 1 OUTA Amplifier Output (Channel A)
—
—
6 6 INB- Inverting Amplifier Input (Channel B)
—
—
5 5 INB+ Noninverting Amplifier Input (Channel B)
—
—
7 7 OUTB Amplifier Output (Channel B)
—
—
— 9 INC- Inverting Amplifier Input (Channel C)
—
—
— 10 INC+ Noninverting Amplifier Input (Channel C)
—
—
— 8 OUTC Amplifier Output (Channel C)
—
—
— 13 IND- Inverting Amplifier Input (Channel D)
—
—
— 12 IND+ Noninverting Amplifier Input (Channel D)
—
—
— 14 OUTD Amplifier Output (Channel D)
5B28 4V
DD
Positive Power-Supply Voltage
— C2 — — N.C. No Connection. Not internally connected.