MAX4230AXK+T datasheet(11/27 Pages) MAXIM

Part #	MAX4230AXK+T

Description	High-Output-Drive, 10MHz, 10V/關s, Rail-to-Rail I/O Op Amps with Shutdown in SC70

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Manufacturer	MAXIM [Maxim Integrated Products]

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To improve step response when R

′ > 2kΩ, connect

small capacitor Cf between the inverting input and out-

put. Choose Cf as follows:

Cf = 8(R / Rf) [pf]

where Rf is the feedback resistor and R is the gain-set-

ting resistor (Figure 5).

Driving Capacitive Loads

The MAX4230–MAX4234 have a high tolerance for

capacitive loads. They are stable with capacitive loads

up to 780pF. Figure 6 is a graph of the stable operating

region for various capacitive loads vs. resistive loads.

Figures 7 and 8 show the transient response with

excessive capacitive loads (1500pF), with and without

the addition of an isolation resistor in series with the

output. Figure 9 shows a typical noninverting capaci-

tive-load-driving circuit in the unity-gain configuration.

High-Output-Drive, 10MHz, 10V/µs,

Rail-to-Rail I/O Op Amps with Shutdown in SC70

______________________________________________________________________________________

11

MAX4230

VIN

VOUT

R

′ = R || Rf

RfCf = RCIN

Rf

Cf

R

INVERTING

MAX4230

VIN

VOUT

R

′ = R || Rf

RfCf = RCIN

Rf

R

Cf

NONINVERTING

Figure 5. Inverting and Noninverting Amplifiers with Feedback

Compensation

0

500

1500

1000

2000

2500

1

100

10

1k

10k

100k

RESISTIVE LOAD (

Ω)

VDD = 5.0V

RL TO VDD/2

STABLE

UNSTABLE

Figure 6. Capacitive-Load Stability

1

μs/div

20mV/div

VDD = 3.0V, CL = 1500pF

RL = 100k

Ω, RISO = 39Ω

Figure 8. Small-Signal Transient Response with Excessive

Capacitive Load with Isolation Resistor

1

μs/div

20mV/div

VDD = 3.0V, CL = 1500pF

RL = 100k

Ω, RISO = 0Ω

Figure 7. Small-Signal Transient Response with Excessive

Capacitive Load

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MAX4230AXK+T Datasheet(PDF) 11 Page - Maxim Integrated Products

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