HFA1130 datasheet(4/12 Pages) INTERSIL

Part #	HFA1130

Description	850MHz, Output Limiting, Low Distortion Current Feedback Operational Amplifier

Download	12 Pages

Scroll/Zoom	100%

Manufacturer	INTERSIL [Intersil Corporation]

Direct Link	http://www.intersil.com/cda/home

Logo

4 / 12 page

4

FN3369.4

July 15, 2005

Application Information

Optimum Feedback Resistor (RF)

The enclosed plots of inverting and non-inverting frequency

response detail the performance of the HFA1130 in various

gains. Although the bandwidth dependency on ACL isn’t as

severe as that of a voltage feedback amplifier, there is an

appreciable decrease in bandwidth at higher gains. This

decrease can be minimized by taking advantage of the current

feedback amplifier’s unique relationship between bandwidth

and RF. All current feedback amplifiers require a feedback

resistor, even for unity gain applications, and the RF, in

conjunction with the internal compensation capacitor, sets the

dominant pole of the frequency response. Thus, the

amplifier’s bandwidth is inversely proportional to RF. The

HFA1130 design is optimized for a 510

Ω RF, at a gain of +1.

Decreasing RF in a unity gain application decreases stability,

resulting in excessive peaking and overshoot (Note:

Capacitive feedback causes the same problems due to the

feedback impedance decrease at higher frequencies). At

higher gains the amplifier is more stable, so RF can be

decreased in a trade-off of stability for bandwidth. The table

below lists recommended RF values for various gains, and the

expected bandwidth.

Clamp Operation

General

The HFA1130 features user programmable output clamps to

limit output voltage excursions. Clamping action is obtained

by applying voltages to the VH and VL terminals (pins 8 and

5) of the amplifier. VH sets the upper output limit, while VL

sets the lower clamp level. If the amplifier tries to drive the

output above VH, or below VL, the clamp circuitry limits the

output voltage at VH or VL (± the clamp accuracy),

respectively. The low input bias currents of the clamp pins

allow them to be driven by simple resistive divider circuits, or

active elements such as amplifiers or DACs.

Clamp Circuitry

Figure 1 shows a simplified schematic of the HFA1130 input

stage, and the high clamp (VH) circuitry. As with all current

feedback amplifiers, there is a unity gain buffer (QX1 - QX2)

between the positive and negative inputs. This buffer forces -IN

to track +IN, and sets up a slewing current of (V-IN -VOUT)/RF.

This current is mirrored onto the high impedance node (Z) by

QX3-QX4, where it is converted to a voltage and fed to the output

via another unity gain buffer. If no clamping is utilized, the high

impedance node may swing within the limits defined by QP4 and

QN4. Note that when the output reaches it’s quiescent value, the

current flowing through -IN is reduced to only that small current

(-IBIAS) required to keep the output at the final voltage.

Tracing the path from VH to Z illustrates the effect of the

clamp voltage on the high impedance node. VH decreases

by 2VBE (QN6 and QP6) to set up the base voltage on QP5.

QP5 begins to conduct whenever the high impedance node

Negative Clamp Range

B

25

-

-5.0 to +2.0

-

V

Positive Clamp Range

B

25

-

-2.0 to +5.0

-

V

Clamp Input Bias Current

A

25

-

50

200

µA

Clamp Input Bandwidth

VH or VL = 100mVP-P

B25

-

500

-

MHz

NOTES:

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

3. See Typical Performance Curves for more information.

Electrical Specifications

VSUPPLY = ±5V, AV = +1, RF = 510Ω, RL = 100Ω, Unless Otherwise Specified (Continued)

PARAMETER

TEST

CONDITIONS

(NOTE 2)

TEST

LEVEL

TEMP.

(°C)

MIN

TYP

MAX

UNITS

ACL

RF (Ω)BW (MHz)

+1

510

850

-1

430

580

+2

360

670

+5

150

520

+10

180

240

+19

270

125

+1

+IN

V-

V+

QP1

QN1

V-

QN3

QP3

QP4

QN2

QP2

QN4

QP5

QN5

Z

V+

-IN

VOUT

ICLAMP

RF

(EXTERNAL)

QP6

QN6

VH

R1

50K

(30K

FOR VL)

200

Ω

FIGURE 1. HFA1130 SIMPLIFIED VH CLAMP CIRCUITRY

HFA1130

Similar Part No. - HFA1130

Manufacturer	Part #	Datasheet	Description
Intersil Corporation	HFA1130	162Kb / 12P	850MHz, Output Limiting, Low Distortion Current Feedback Operational Amplifier September 1998
Renesas Technology Corp	HFA1130	710Kb / 13P	850MHz, Output Limiting, Low Distortion Current Feedback Operational Amplifier
Intersil Corporation	HFA1130	381Kb / 13P	850MHz, Output Limiting, Low Distortion Current Feedback Operational Amplifier April 25, 2013
	HFA1130883	865Kb / 19P	Output Clamping, 850MHz Current Feedback Amplifier
	HFA1130EVAL	162Kb / 12P	850MHz, Output Limiting, Low Distortion Current Feedback Operational Amplifier September 1998

More results

Similar Description - HFA1130

Manufacturer	Part #	Datasheet	Description
Renesas Technology Corp	HFA1130	710Kb / 13P	850MHz, Output Limiting, Low Distortion Current Feedback Operational Amplifier
Intersil Corporation	HFA1130	162Kb / 12P	850MHz, Output Limiting, Low Distortion Current Feedback Operational Amplifier September 1998
	HFA1130IBZ	381Kb / 13P	850MHz, Output Limiting, Low Distortion Current Feedback Operational Amplifier April 25, 2013
	HFA1100	335Kb / 10P	850MHz, Low Distortion Current Feedback Operational Amplifiers
Renesas Technology Corp	HFA1100	594Kb / 10P	850MHz, Low Distortion Current Feedback Operational Amplifiers
Intersil Corporation	HFA1100IP	340Kb / 10P	850MHz, Low Distortion Current Feedback Operational Amplifiers October 26, 2004
	HFA1100	134Kb / 10P	850MHz, Low Distortion Current Feedback Operational Amplifiers May 1999
	HFA1113	490Kb / 16P	850MHz, Low Distortion, Output Limiting, Programmable Gain, Buffer Amplifier
	HFA1113	252Kb / 17P	850MHz, Low Distortion, Output Limiting, Programmable Gain, Buffer Amplifier February 1999
Renesas Technology Corp	HFA1113	955Kb / 16P	850MHz, Low Distortion, Output Limiting, Programmable Gain, Buffer Amplifier July 11, 2005

More results

HFA1130 Datasheet(PDF) 4 Page - Intersil Corporation

HFA1130 Datasheet(HTML) 4 Page - Intersil Corporation

Similar Part No. - HFA1130

Similar Description - HFA1130

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12

Datasheet Download

Link URL