HA-2541 データシートの表示（PDF） - Intersil

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HA-2541

40MHz, Fast Settling, Unity Gain Stable, Operational Amplifier

Intersil 

HA-2541

Typical Applications (Also see Application Note AN550)

Application 1

High power amplifiers and buffers are in use in a wide variety

of applications. Many times the “high power” capability is

needed to drive large capacitive loads as well as low value

resistive loads. In both cases the final driver stage is usually a

power transistor of some type, but because of their inherently

low gain, several stages of pre-drivers are often required. The

HA-2541, with its 10mA output rating, is powerful enough to

drive a power transistor without additional stages of current

amplification. This capability is well demonstrated with the

high power buffer circuit in Figure 3.

The HA-2541 acts as the pre-driver to the output power

transistor. Together, they form a unity gain buffer with the

ability to drive three 50Ω coaxial cables in parallel, each with

a capacitance of 2000pF. The total combined load is 16.6Ω

and 6000pF capacitance.

Application 2

VIDEO

One of the primary uses of the HA-2541 is in the area of

video applications. These applications include signal

construction, synchronization addition and removal, as well

as signal modification. A wide bandwidth device such as the

HA-2541 is well suited for use in this class of amplifier. This,

however, is a more involved group of applications than

ordinary amplifier applications since video signals contain

precise DC levels which must be retained.

The addition of a clamping circuit restores DC levels at the

output of an amplifier stage. The circuit shown in Figure 4

utilizes the HA-5320 sample and hold amplifier as the DC

clamp. Also shown is a 3.57MHz trap in series, which will

block the color burst portion of the video signal and allow the

DC level to be amplified and restored.

50Ω

R1

D3

+

HA-2541

-

R3

100Ω

532pF

R2

1kΩ

D1

HP2835

2N5886

HP2835

D2

3.57MHz

TRAP

1kΩ

1kΩ

1kΩ

HA-2541

1kΩ

1kΩ

LOAD 16.6Ω; 6000pF

OR 12.5Ω; 6000pF

75Ω

FIGURE 3. DRIVING POWER TRANSISTORS TO GAIN

ADDITIONAL CURRENT BOOSTING

FIGURE 4. VIDEO DC RESTORER

Suggested Offset Voltage Adjustment

NC 1

NC 2

RT BAL 3

4

-IN

+IN 5

-

+

V- 6

NC 7

14 NC

13 NC

12 BAL

V+

11

10 OUT

9 NC

8 NC

NOTE: Tested Offset Adjustment Range is |VOS +

1mV| minimum referred to output. Typical range is

±15mV for RT = 5kΩ.

5

FN2898.4

November 19, 2004

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