MAX4412EXK-T(2000) Просмотр технического описания (PDF) - Maxim Integrated

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MAX4412EXK-T
(Rev.:2000)

Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs

Maxim Integrated 

Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz

Single-Supply Op Amps with Rail-to-Rail Outputs

f0

=

1

2π

×

1

R2 × R3 × C1 × C2

C2

C1 × C2 × R2 × R3

Q=

1+ 1+ 1

R1 R2 R3

ADC Input Buffer

Input buffer amplifiers can be a source of significant

errors in high-speed analog-to-digital converter (ADC)

applications. The input buffer is usually required to

rapidly charge and discharge the ADC’s input, which is

often capacitive (see Output Capacitive Loading and

Stability). In addition, since a high-speed ADC’s input

impedance often changes very rapidly during the con-

version cycle, measurement accuracy must be main-

tained using an amplifier with very low output

impedance at high frequencies. The combination of

high speed, fast slew rate, low noise, and a low and

stable distortion overload makes the MAX4412/

MAX4413 ideally suited for use as buffer amplifiers in

high-speed ADC applications.

Layout and Power-Supply Bypassing

These amplifiers operate from a single +2.7V to +5.5V

power supply. Bypass VCC to ground with a 0.1µF

capacitor as close to the pin as possible.

Maxim recommends using microstrip and stripline tech-

niques to obtain full bandwidth. Design the PC board

for a frequency greater than 1GHz to prevent amplifier

performance degradation due to board parasitics.

Avoid large parasitic capacitances at inputs and out-

puts. Whether or not a constant-impedance board is

used, observe the following guidelines:

• Do not use wire-wrap boards due to their high induc-

tance.

• Do not use IC sockets because of the increased par-

asitic capacitance and inductance.

• Use surface-mount instead of through-hole compo-

nents for better high-frequency performance.

• Use a PC board with at least two layers; it should be

as free from voids as possible.

• Keep signal lines as short and as straight as possible.

Do not make 90° turns; round all corners.

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