MAX4131 View Datasheet(PDF) - Maxim Integrated

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MAX4131

Single/Dual/Quad, Wide-Bandwidth, Low-Power, Single-Supply, Rail-to-Rail I/O Op Amps

Maxim Integrated 

MAX4130–MAX4134

Single/Dual/Quad, Wide-Bandwidth, Low-Power,

Single-Supply, Rail-to-Rail I/O Op Amps

Rail-to-Rail Output Stage

The minimum output voltage is within millivolts of

ground for single-supply operation where the load is

referenced to ground (VEE). Figure 3 shows the input

voltage range and output voltage swing of a MAX4131

connected as a voltage follower. With a +3V supply

and the load tied to ground, the output swings from

0.00V to 2.90V. The maximum output voltage swing

depends on the load, but will be within 150mV of a +3V

supply, even with the maximum load (500Ω to ground).

Driving a capacitive load can cause instability in most

high-speed op amps, especially those with low quies-

cent current. The MAX4130–MAX4134 have a high tol-

erance for capacitive loads. They are stable with

capacitive loads up to 160pF. Figure 4 gives the stable

operating region for capacitive loads. Figures 5 and 6

show the response with capacitive loads and the

results of adding an isolation resistor in series with the

output (Figure 7). The resistor improves the circuit’s

phase margin by isolating the load capacitor from the

op amp’s output.

VCC = 3V, RL = 10kΩ to VEE

IN

OUT

TIME (1μs/div)

Figure 3. Rail-to-Rail Input/Output Voltage Range

VCC = 5V

RL = 10kΩ

CL = 130pF

IN

500

450

400

UNSTABLE

350

OPERATING

300

REGION

250

200

150

100

50 RL TO VEE

VOUT = VCC/2

0

0.1

1

STABLE

OPERATING

REGION

10

100

LOAD RESISTANCE (kΩ)

Figure 4. Capacitive-Load Stability

VCC = 5V

CL = 1000pF

RS = 39Ω

IN

OUT

TIME (200ns/div)

Figure 5. MAX4131 Small-Signal Transient Response with

Capacitive Load

Maxim Integrated

OUT

TIME (500ns/div)

Figure 6. MAX4131 Transient Response to Capacitive Load

with Isolation Resistor

11

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