Datasheet

Detailed Description
Rail-to-Rail Output Stage
The MAX4484/MAX4486/MAX4487 can drive a 2kΩ load
and still swing within 50mV of the supply rails. Figure 1
shows the output swing of the MAX4484 configured with
A
V
= +1V/V.
Driving Capacitive Loads
Driving a capacitive load can cause instability in many op
amps, especially those with low quiescent current. The
MAX4484/MAX4486/MAX4487 are unity-gain stable for
a range of capacitive loads up to 100pF. Figure 2 shows
the response of the MAX4484 with an excessive capaci-
tive load. Adding a series resistor between the output
and the load capacitor (Figure 3) improves the circuit’s
response by isolating the load capacitance from the op
amp’s output.
Applications Information
Power Supplies and Layout
The MAX4484/MAX4486/MAX4487 operate from a single
+2.7V to +5.5V power supply. Bypass the power supply
with 0.1μF capacitor to ground. Good layout techniques
optimize performance by decreasing the amount of
stray capacitance at the op amp’s inputs and outputs. To
decrease stray capacitance, minimize trace lengths by
placing external components close to the op amp’s pins.
Use surface-mount components for best results.
PIN
NAME FUNCTION
MAX4484 MAX4486 MAX4487
3 — — IN- Inverting Amplier Input
1 — — IN+ Noninverting Amplier Input
4 — — OUT Amplier Output
— 2 2 INA- Inverting Amplier Input (Channel A)
— 3 3 INA+ Noninverting Amplier Input (Channel A)
— 1 1 OUTA Amplier Output (Channel A)
— 6 6 INB- Inverting Amplier Input (Channel B)
— 5 5 INB+ Noninverting Amplier Input (Channel B)
— 7 7 OUTB Amplier Output (Channel B)
— — 9 INC- Inverting Amplier Input (Channel C)
— — 10 INC+ Noninverting Amplier Input (Channel C)
— — 8 OUTC Amplier Output (Channel C)
— — 13 IND- Inverting Amplier Input (Channel D)
— — 12 IND+ Noninverting Amplier Input (Channel D)
— — 14 OUTD Amplier Output (Channel D)
2 4 11 V
SS
Negative Power-Supply Voltage
5 8 4 V
DD
Positive Power-Supply Voltage
MAX4484/MAX4486/
MAX4487
Single/Dual/Quad, Low-Cost, Single-Supply
7MHz, Rail-to-Rail Op Amps
www.maximintegrated.com
Maxim Integrated │ 6
Pin Description