Intersil Corporation HFA1102 Datasheet

Semiconductor

/
j

/

/

HFA1102

[ /Title
(HFA11

02)
Sub­ect

(600MH
z Cur­rent
Feed­back
Ampli­fier with
Com­pensa­tion Pin)

Author

()

Key-

words
(Harris
Semi­conduc­tor,
single,
video
opera­tional
ampli­fier, op
amp,
high
speed
video,
high
slew
rate, 5V
single
supply,

OBSOLETE PRODUCT

POSSIBLE SUBSTITUTE PRODUCT

HFA1100, HFA1109

600MHz Current Feedback
Amplifier with Compensation Pin

Description

The HFA1102 is a high speed wideband current feedback
amplifier featuring a compensation pin for bandwidth limiting.
Built with Harris’ proprietary complementary bipolar UHF-1
process, it has excellent AC performance and low distortion.

Because the HFA1102 is already unity gain stable, the
primary purpose for limiting the bandwidth is to reduce the
total noise (broadband) of the circuit. The bandwidth of the
HFA1102 may be limited by connecting a capacitor and
series damping resistor from pin 8 to ground. Typical
bandwidths for various values of compensation capacitors
are shown in the Electrical Specifications section of this
datasheet.

A variety of packages and temperature grades are available.
See the ordering information below for details.

Part Number Information

PART NUMBER

(BRAND)

HFA1102IB
(H1102I)

HFA11XXEVAL DIPEvaluation Board for High Speed Op Amps

TEMP.

RANGE (oC) PACKAGE

-40 to 85 8 Ld SOIC M8.15

PKG.

NO.

Pinout

HFA1102

(SOIC)

TOP VIEW

NC

-IN

+IN

1
2

-

+

3
4

V-

8
7
6
5

COMP
V+
OUT
NC

January 1999 File Number 3597.4

Features

• Compensation Pin for Bandwidth Limiting

• Low Distortion (HD2 at 30MHz) . . . . . . . . . . . . . . . -56dBc

• -3dB Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . .600MHz

• Very Fast Slew Rate. . . . . . . . . . . . . . . . . . . . . .2000V/µs

• Fast Settling Time (0.1%). . . . . . . . . . . . . . . . . . . . . 11ns

• Excellent Gain Flatness

- (100MHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.05dB

- (50MHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.02dB

- (30MHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±0.01dB

• High Output Current . . . . . . . . . . . . . . . . . . . . . . . . .60mA

• Overdrive Recovery . . . . . . . . . . . . . . . . . . . . . . . . <10ns

Applications

• Low Noise Amplifiers

• Video Switching and Routing

• Pulse and Video Amplifiers

• RF/IF Signal Processing

• Flash A/D Driver

• Medical Imaging Systems

The Op Amps with Fastest Edges

INPUT
220MHz
SIGNAL

OUTPUT
(A

= 2)

V

HFA1102
OP AMP

0ns 25ns

1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

© Harris Corporation 1999

Copyright

HFA1102

Absolute Maximum Ratings Thermal Information

Voltage Between V+ and V-. . . . . . . . . . . . . . . . . . . . . . . . . . . . 12V

DC Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V

Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V

Output Current (50% Duty Cycle) . . . . . . . . . . . . . . . . . . . . . . 60mA

SUPPLY

Operating Conditions

Temperature Range. . . . . . . . . . . . . . . . . . . . . . . . . . -40oC to 85oC

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operationofthe
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

NOTE:

1. θJA is measured with the component mounted on an evaluation PC board in free air.

Thermal Resistance (Typical, Note 1) θJA (oC/W) θJC (oC/W)

SOIC Package . . . . . . . . . . . . . . . . . . . 170 N/A

Maximum Junction Temperature (Plastic Package) . . . . . . . .150oC

Maximum Storage Temperature Range. . . . . . . . . . -65oC to 150oC

Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC

(SOIC - Lead Tips Only)

Electrical Specifications V

Unless Otherwise Specified

PARAMETER

INPUT CHARACTERISTICS

Input Offset Voltage 25 - 2 6 mV

Input Offset Voltage Drift Full - 10 - µV/oC
VIO CMRR ∆VCM = ±2V 25 40 46 - dB

VIO PSRR ∆VS = ±1.25V 25 45 50 - dB

Non-Inv. Input Bias Current +IN = 0V 25 - 25 40 µA

+I

Drift Full - 40 - nA/oC

BIAS

+I

CMS ∆VCM = ±2V 25 - 20 40 µA/V

BIAS

Inv. Input Bias Current -IN = 0V 25 - 12 50 µA

-I

Drift Full - 40 - nA/oC

BIAS

-I

CMS ∆VCM = ±2V 25 - 1 7 µA/V

BIAS

-I

PSS ∆VS = ±1.25V 25 - 6 15 µA/V

BIAS

Non-Inv. Input Resistance 25 25 50 - kΩ
Inv. Input Resistance 25 - 16 30 Ω
Input Capacitance Either Input 25 - 2 - pF
Input Common Mode Range Full ±2.5 ±3.0 - V
Input Noise Voltage 100kHz 25 - 4 - nV/√Hz
+Input Noise Current 100kHz 25 - 18 - pA/√Hz

-Input Noise Current 100kHz 25 - 21 - pA/√Hz
TRANSFER CHARACTERISTICS AV = +1, RF = 150Ω, R
Open Loop Transimpedance 25 - 500 - kΩ

= ±5V, AV= +1, RF= 510Ω,RL= 100Ω,C

SUPPLY

TEST

CONDITIONS

= 120Ω, Unless Otherwise Specified

DAMP

= 0pF,

COMP

TEMP.

(oC) MIN TYP MAX UNITS

Full - - 10 mV

Full 38 - - dB

Full 42 - - dB

Full - - 65 µA

Full - - 50 µA/V

Full - - 60 µA

Full - - 10 µA/V

Full - - 27 µA/V

2

HFA1102

Electrical Specifications V

= ±5V, AV= +1, RF= 510Ω,RL= 100Ω,C

SUPPLY

COMP

= 0pF,

Unless Otherwise Specified (Continued)

PARAMETER

TEST

CONDITIONS

TEMP.

(oC) MIN TYP MAX UNITS

Linear Phase Deviation DC to 100MHz 25 - 0.6 - Degrees
Differential Gain NTSC, RL = 75Ω 25 - 0.03 - %
Differential Phase NTSC, RL = 75Ω 25 - 0.03 - Degrees
Minimum Stable Gain Full 1 - - V/V
Bandwidth Limiting Characteristics

-3dB Bandwidth (V

OUT

= 0.2V

, AV = +1)

P-P

Gain Flatness (To 30MHz) C

C

= 0pF 25 - 600 - MHz

COMP

C

= 1pF 25 - 350 - MHz

COMP

C

= 3pF 25 - 190 - MHz

COMP

C

= 7pF 25 - 55 - MHz

COMP

= 0pF 25 - ±0.01 - dB

COMP

C

= 1pF 25 - ±0.05 - dB

COMP

C

= 3pF 25 - ±0.10 - dB

COMP

Gain Flatness To 100MHz 25 - ±0.05 - dB
Gain Flatness To 50MHz 25 - ±0.02 - dB
OUTPUT CHARACTERISTICS AV = +2, Unless Otherwise Specified
Output Voltage AV = -1 25 ±3.0 ±3.3 - V

Full ±2.5 ±3.0 - V

Output Current RL = 50Ω, AV = -1 25 50 65 - mA

Full 40 60 - mA
Closed Loop Output Impedance DC 25 - 0.1 - Ω
2nd Harmonic Distortion 30MHz, V
3rd Harmonic Distortion 30MHz, V

OUT
OUT

= 2V
= 2V

P-P
P-P

25 - -56 - dBc

25 - -80 - dBc
3rd Order Intercept 100MHz 25 - 30 - dBm
1dB Compression 100MHz 25 - 20 - dBm
TRANSIENT RESPONSE AV = +1, RF = 150Ω, R
Rise Time V
Overshoot V
Slew Rate AV = +1, V

0.1% Settling Time V

0.2% Settling Time V

= 120Ω, Unless Otherwise Specified

DAMP

= 2.0V Step 25 - 600 - ps

OUT

= 2.0V Step 25 - 10 - %

OUT

= 5V

OUT

AV = +2, V

OUT
OUT

OUT

= 2V to 0V 25 - 11 - ns
= 2V to 0V 25 - 7 - ns

= 5V

P-P
P-P

25 - 1200 - V/µs

25 - 2000 - V/µs

POWER SUPPLY CHARACTERISTICS

Supply Voltage Range Full ±4.5 - ±5.5 V
Supply Current 25 - 21 26 mA

Full - - 33 mA

3

5

HFA1102

Application Information

Optimum Feedback Resistor (RF)

All current feedbackamplifiers require a feedback resistor, even
for unity gain applications. The R
internal compensation capacitor, sets the dominant pole of the
frequency response. Thus, the amplifier's bandwidth is
inverselyproportional to R
for a 150Ω R

, at a gain of +1. Decreasing RF in a unity gain

F

application decreases stability, leading to excessive peaking
and overshoot. At higher gains the amplifier is more stable , so
R

can be decreased in a trade-off of stability for bandwidth.

F

Bandwidth Limiting

The bandwidth of the HF A1102 ma y be limited by connecting a
resistor(R

)and capacitor in series from pin 8 to GND .The

DAMP

series resister is required to damp the interaction between the
package parasitics and C

COMP

valuesof compensation capacitor are shownin the specification
tables. Because the HFA1102 is already unity gain stable , the
main reason for limiting the bandwidth is to reduce the total
noise (broadband) of the circuit. Additionally, compensating the
HF A1102 allo ws the use of a low er v alue R
The decreased bandwidth due to C
increase from the lower R
Reducing R
(-I

B×RF

providesthe double benefits of reduced DC errors

F

) and reduced total noise (INI×RF and 4KTRF).

F

PC Board Layout

The frequency performance of this amplifier depends a great
deal on the amount of care taken in designing the PC board.

The use of low inductance components such as chip
resistors and chip capacitors is strongly recommended,
while a solid ground plane is a must!

Attention should be given to decoupling the power supplies. A
large value (10µF) tantalum in parallel with a small v alue chip
(0.1µF) capacitor works well in most cases.

Terminated microstrip signal lines are recommended at the
input and output of the device.Output capacitance, such as that
resulting from an improperly terminated transmission line will
degrade the frequency response of the amplifier and may
cause oscillations. In most cases, the oscillation can be avoided
by placing a resistor in series with the output.

Care must also be taken to minimize the capacitance to ground
seen by the amplifier’s in verting input. The larger this
capacitance, the worse the gain peaking, resulting in pulse
overshoot and possible instability. To this end, it is
recommended that the ground plane be removed under traces
connected to pin 2, and connections to pin 2 should be kept as
short as possible.

An example of a good high frequency lay out is the Ev aluation
Board shown.

Evaluation Board

The HF A1102 ma y be evaluated using the HFA11XX
Evaluation Board which is availab le from y our local sales office
(part number HFA11XXEVAL). R
connected in series from the socket pin to the GND plane. The
trace from pin 8 to the V
socket to remov e this parallel capacitance .The la y out and
schematic of the board are shown below:

connector should be cut near the

H

, in conjunction with the

F

. The HFA1102 design is optimized

F

. Typical bandwidths for various

for a given gain.

F

offsets the bandwidth

COMP

, keeping the amplifier stable.

DAMP

and C

COMP

should be

500Ω

50Ω

IN

0.1µF10µF

+IN

FIGURE 1. EVALUATION BOARD SCHEMATIC AND LAYOUT

600

60

6

0.6

0.06

GAIN (kΩ)

CC = 3pF

CC = 7pF

0.01 0.1 0.3 0.6 1 3 6 10 30 60 100 300 600

FIGURE 2. OPEN LOOP TRANSIMPEDANCE FOR VARIOUS

COMPENSATION CAPACITORS

500Ω

1
2
3
4

-5V

TOP LAYOUT

V

H

1

BOTTOM LAYOUT

CC = 3pF

CC = 7pF

CC = 0pF

CC = 1pF

FREQUENCY (MHz)

8
7
6
5

GND

OUT

V

L

V-

CC = 0pF

CC = 1pF

PHASE

50Ω

GND

V

H

GND

V+

AV = -1

OUT
V

L

10µF0.1µF

180
135
90
45
0

+

PHASE (DEGREES)

4