HFA1112A Ver la hoja de datos (PDF) - Intersil

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componentes Descripción

Fabricante

HFA1112A

850MHz, Low Distortion Programmable Gain Buffer Amplifiers

Intersil 

HFA1112, HFA1112A

(as illustrated in the curves), the maximum bandwidth is

obtained without sacrificing stability. Even so, bandwidth

does decrease as you move to the right along the curve.

For example, at AV = +1, RS = 50Ω, CL = 30pF, the overall

bandwidth is limited to 300MHz, and bandwidth drops to

100MHz at AV = +1, RS = 5Ω, CL = 340pF.

50

45

40

AV = +1

35

30

25

20

15

10

5

0

AV = +2

0 40 80 120 160 200 240 280 320

LOAD CAPACITANCE (pF)

360 400

FIGURE 1. RECOMMENDED SERIES OUTPUT RESISTOR vs

LOAD CAPACITANCE

Evaluation Board

The performance of the HFA1112 may be evaluated using

the HFA11XX Evaluation Board, slightly modified as follows:

1. Remove the 500Ω feedback resistor (R2), and leave the

connection open.

2. a. For AV = +1 evaluation, remove the 500Ω gain setting

resistor (R1), and leave pin 2 floating.

b. For AV = +2, replace the 500Ω gain setting resistor with

a 0Ω resistor to GND.

The layout and modified schematic of the board are shown

in Figure 2.

To order evaluation boards (part number HFA11XXEVAL),

please contact your local sales office.

∞ (AV = +1)

or 0Ω (AV = +2)

R1

1

50Ω

2

IN

3

4

10µF 0.1µF

-5V

VH

8 0.1µF

7

50Ω

6

10µF

+5V

OUT

5

GND

VL

GND

TOP LAYOUT

VH

1

+IN

VLOVU- T V+

GND

FIGURE 2. EVALUATION BOARD SCHEMATIC AND LAYOUT

BOTTOM LAYOUT

5

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