MAX4416EUA 데이터 시트보기 (PDF) - Maxim Integrated

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MAX4416EUA

Low-Power, +3V/+5V, 400MHz Single-Supply Op Amps with Rail-to-Rail Outputs

Maxim Integrated 

Low-Power, +3V/+5V, 400MHz Single-Supply

Op Amps with Rail-to-Rail Outputs

MAX4414

MAX4415

1, 5, 8

3

—

—

—

—

2

—

—

—

—

4

6

—

—

—

—

7

PIN

MAX4416

MAX4417

—

—

3

5

—

—

—

2

6

—

—

4

—

1

7

—

—

8

MAX4418

MAX4419

—

—

3

5

10

12

—

2

6

9

13

11

—

1

7

8

14

4

Pin Description

NAME

FUNCTION

N.C.

IN+

INA+

INB+

INC+

IND+

IN-

INA-

INB-

INC-

IND-

VEE

OUT

OUTA

OUTB

OUTC

OUTD

VCC

No Connection. Not internally connected.

Amplifier Noninverting Input

Amplifier A Noninverting Input

Amplifier B Noninverting Input

Amplifier C Noninverting Input

Amplifier D Noninverting Input

Amplifier Inverting Input

Amplifier A Inverting Input

Amplifier B Inverting Input

Amplifier C Inverting Input

Amplifier D Inverting Input

Negative Power Supply

Amplifier Output

Amplifier A Output

Amplifier B Output

Amplifier C Output

Amplifier D Output

Positive Power Supply

_______________Detailed Description

The MAX4414–MAX4419 single-supply, rail-to-rail, volt-

age-feedback amplifiers achieve high slew rates and

bandwidths, while consuming only 1.6mA of supply

current per amplifier. Excellent harmonic distortion and

differential gain/phase performance make these ampli-

fiers an ideal choice for a wide variety of video and RF

signal-processing applications.

Internal feedback around the output stage ensures low

open-loop output impedance, reducing gain sensitivity

to load variations. This feedback also produces

demand-driven current bias to the output transistors.

Rail-to-Rail Outputs, Ground-Sensing Input

The MAX4414–MAX4419 input common-mode range

extends from (VEE - 0.1V) to (VCC - 1.5V) with excellent

common-mode rejection. Beyond this range, the ampli-

fier output is a nonlinear function of the input, but does

not undergo phase reversal or latchup.

The output swings to within 105mV of either power-sup-

ply rail with a 1kΩ load. Input ground sensing and rail-

to-rail output substantially increase the dynamic range.

With a symmetric input in a single +5V application, the

input can swing 3.6Vp-p, and the output can swing

4.6Vp-p with minimal distortion.

Output Capacitive Loading and Stability

The MAX4414–MAX4419 are optimized for AC perfor-

mance. They are not designed to drive highly reactive

loads. Such loads decrease phase margin and may

produce excessive ringing and oscillation. The use of

an isolation resistor eliminates this problem (Figure 1).

Figure 2 is a graph of the Optimal Isolation Resistor

(RISO) vs. Capacitive Load.

The Small-Signal Gain vs. Frequency with Capacitive

Load and No Isolation Resistor graph in the Typical

Operating Characteristics shows how a capacitive load

causes excessive peaking of the amplifier’s frequency

response if the capacitor is not isolated from the ampli-

fier by a resistor. A small isolation resistor (usually 20Ω

to 30Ω) placed before the reactive load prevents ring-

ing and oscillation. At higher capacitive loads, AC per-

formance is controlled by the interaction of the load

capacitance and the isolation resistor. The Small-Signal

Gain vs. Frequency with Capacitive Load and 22Ω

Isolation Resistor graph shows the effect of a 22Ω isola-

tion resistor on closed-loop response.

______________________________________________________________________________________ 15

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