H1115I 查看數據表（PDF） - Intersil

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H1115I

225MHz, Low Power, Output Limiting, Closed Loop Buffer Amplifier

Intersil 

HFA1115

Electrical Specifications VSUPPLY = ±5V, AV = +1, RL = 100Ω, Unless Otherwise Specified (Continued)

PARAMETER

TEST

CONDITIONS

(NOTE 3)

TEST

TEMP.

LEVEL

(oC)

MIN

TYP

MAX

UNITS

Slew Rate

(VOUT = 5VP-P, AV = +2)

+SR

-SR (Note 5)

B

25

-

1265

-

V/μs

B

25

-

870

-

V/μs

Settling Time

(VOUT = +2V to 0V step, Note 4)

To 0.1%

To 0.05%

B

25

-

23

-

ns

B

25

-

33

-

ns

To 0.02%

B

25

-

45

-

ns

VIDEO CHARACTERISTICS

Differential Gain

f = 3.58MHz, AV = +2,

RL = 150Ω

B

25

-

0.02

-

Differential Phase

f = 3.58MHz, AV = +2,

RL = 150Ω

B

25

-

0.03

-

OUTPUT LIMITING CHARACTERISTICS AV = +2, VH = +1V, VL = -1V, Unless Otherwise Specified

Limit Accuracy (Note 4)

VIN = ±1.6V, AV = -1

A

Full

-125

-70

125

Overdrive Recovery Time (Note 4)

VIN = ±1V

B

25

-

0.8

-

Negative Limit Range

B

25

-5.0 to +2.5

%

Degrees

mV

ns

V

Positive Limit Range

B

25

-2.5 to +5.0

V

Limit Input Bias Current

A

Full

-

85

200

μA

Limit Input Bandwidth

C

25

-

100

-

MHz

POWER SUPPLY CHARACTERISTICS

Power Supply Range

C

25

4.5

-

5.5

±V

Power Supply Current (Note 4)

A

25

6.6

6.9

7.1

mA

A

Full

-

7.1

7.3

mA

NOTE:

3. Test Level: A. Production Tested; B. Typical or Guaranteed Limit Based on Characterization; C. Design Typical for Information Only.

4. See Typical Performance Curves for more information.

5. Slew rates are asymmetrical if the output swings below GND (e.g., a bipolar signal). Positive unipolar output signals have symmetric positive and

negative slew rates comparable to the +SR specification. See the “Application Information” section, and the pulse response graphs for details.

Application Information

Relevant Application Notes

The following Application Notes pertain to the HFA1115:

• AN9653-Use and Application of Output Limiting

Amplifiers

• AN9752-Sync Stripper and Sync Inserter for

Composite Video

These publications may be obtained from Intersil’s web site

(http://www.intersil.com).

HFA1115 Advantages

The HFA1115 features a novel design which allows the user

to select from three closed loop gains, without any external

components. The result is a more flexible product, fewer part

types in inventory, and more efficient use of board space.

Implementing a gain of 2, cable driver with this IC eliminates

4

the two gain setting resistors, which frees up board space for

termination resistors.

Like most newer high performance amplifiers, the HFA1115

is a current feedback amplifier (CFA). CFAs offer high

bandwidth and slew rate at low supply currents, but can be

difficult to use because of their sensitivity to feedback

capacitance and parasitics on the inverting input (summing

node). The HFA1115 eliminates these concerns by bringing

the gain setting resistors on-chip. This yields the optimum

placement and value of the feedback resistor, while

minimizing feedback and summing node parasitics. Because

there is no access to the summing node, the PCB parasitics

do not impact performance at gains of +2 or -1 (see “Unity

Gain Considerations” for discussion of parasitic impact on

unity gain performance).

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