Datasheet HFA1205 Datasheet (Intersil Corporation)

HFA1205

September 1998 File Number 3605.5

Dual, 400MHz, Low Power, Video
Operational Amplifier

The HFA1205 is a dual, high speed, low power current
feedback amplifier built with Intersil’s proprietary
complementary bipolar UHF-1 process.

These amplifiers deliver 400MHz bandwidth and 1275V/µs
slew rate, on only 60mW of quiescent power. They are
specifically designed to meet the performance, power, and
cost requirements of high volume video applications. The
excellent gain flatness and differential gain/phase
performance make these amplifiers well suited for
component or composite video applications. Video
performance is maintained even when driving a back
terminated cable (R
when driving two back terminated cables (R

= 150Ω), and degrades only slightly

L

=75Ω). RGB

L

applications will benefit from the high slew rates, and high
full power bandwidth.

The HFA1205 is a pin compatible, low power, high
performance upgrade for the popular Intersil HA5023. For a
dual amplifier with output disable capability, please see the
HFA1245 datasheet.

Ordering Information

PART NUMBER

(BRAND)

HFA1205IP -40 to 85 8 Ld PDIP E8.3
HFA1205IB

(H1205I)
HA5023EVAL High Speed Op Amp DIP Evaluation Board

TEMP.

RANGE (oC) PACKAGE

-40 to 85 8 Ld SOIC M8.15

PKG.

NO.

Features

• Low Supply Current . . . . . . . . . . . . . . . . . 5.8mA/Op Amp

• High Input Impedance . . . . . . . . . . . . . . . . . . . . . . . 2MΩ

• Wide -3dB Bandwidth (A

= +2). . . . . . . . . . . . . . 400MHz

V

• Very Fast Slew Rate. . . . . . . . . . . . . . . . . . . . . . 1275V/µs

• Gain Flatness (to 50MHz). . . . . . . . . . . . . . . . . . . . ±0.03dB

• Differential Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.03%

• Differential Phase. . . . . . . . . . . . . . . . . . . . 0.03 Degrees

• Pin Compatible Upgrade to HA5023

Applications

• Flash A/D Drivers

• High Resolution Monitors

• Video Switching and Routing

• Professional Video Processing

• Video Digitizing Boards/Systems

• Multimedia Systems

• RGB Preamps

• Medical Imaging

• Hand Held and Miniaturized RF Equipment

• Battery Powered Communications

• High Speed Oscilloscopes and Analyzers

Pinout

HFA1205

(PDIP, SOIC)

TOP VIEW

OUT1

1
2

-IN1

+IN1

1

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

http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999

-

+

3
4

V-

8

V+

7

OUT2

6

-IN2

-

+

5

+IN2

HFA1205

Absolute Maximum Ratings Thermal Information

Voltage Between V+ and V-. . . . . . . . . . . . . . . . . . . . . . . . . . . . .11V

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

Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8V

Output Current (Note 2). . . . . . . . . . . . . . . . .Short Circuit Protected

30mA Continuous

60mA ≤ 50% Duty Cycle

ESD Rating

Human Body Model (Per MIL-STD-883 Method 3015.7). . . .600V

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.

NOTES:

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

2. Output is short circuit protected to ground. Brief short circuits to ground will not degrade reliability, however continuous (100% duty cycle) output
current must not exceed 30mA for maximum reliability.

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

PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

Maximum Junction Temperature (Die Only) . . . . . . . . . . . . . . . .175oC

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

PARAMETER TEST CONDITIONS

INPUT CHARACTERISTICS

Input Offset Voltage A 25 - 2 5 mV

Average Input Offset Voltage Drift B Full - 1 10 µV/oC
Input Offset Voltage

Common-Mode Rejection Ratio

Input Offset Voltage
Power Supply Rejection Ratio

Non-Inverting Input Bias Current A 25 - 6 15 µA

Non-Inverting Input Bias Current Drift B Full - 5 60 nA/oC
Non-Inverting Input Bias Current

Power Supply Sensitivity

Non-Inverting Input Resistance ∆VCM = ±1.8V A 25 0.8 2 - MΩ

Inverting Input Bias Current A 25 - 2 8.5 µA

Inverting Input Bias Current Drift B Full - 60 200 nA/oC
Inverting Input Bias Current

Common-Mode Sensitivity

= ±5V, AV = +1, RF = 560Ω, RL = 100Ω, Unless Otherwise Specified

SUPPLY

(NOTE 3)

TEST

LEVEL

A Full - 3 8 mV

∆VCM = ±1.8V A 25 45 48 - dB
∆VCM= ±1.8V A 85 43 46 - dB
∆VCM = ±1.2V A -40 43 46 - dB
∆VPS = ±1.8V A 25 48 52 - dB
∆VPS = ±1.8V A 85 46 50 - dB
∆VPS = ±1.2V A -40 46 50 - dB

A Full - 10 25 µA

∆VPS = ±1.8V A 25 - 0.5 1 µA/V
∆VPS = ±1.8V A 85 - 0.8 3 µA/V
∆VPS = ±1.2V A -40 - 0.8 3 µA/V

∆VCM = ±1.8V A 85 0.5 1.3 - MΩ
∆VCM = ±1.2V A -40 0.5 1.3 - MΩ

A Full - 5 15 µA

∆VCM = ±1.8V A 25 - 3 6 µA/V
∆VCM = ±1.8V A 85 - 4 8 µA/ V
∆VCM = ±1.2V A -40 - 4 8 µA/V

TEMP.

(oC) MIN TYP MAX UNITS

2

HFA1205

Electrical Specifications V

= ±5V, AV = +1, RF = 560Ω, RL = 100Ω, Unless Otherwise Specified (Continued)

SUPPLY

(NOTE 3)

PARAMETER TEST CONDITIONS

Inverting Input Bias Current
Power Supply Sensitivity

TEST

LEVEL

∆VPS = ±1.8V A 25 - 2 5 µA/V
∆VPS = ±1.8V A 85 - 4 8 µA/V

TEMP.

(oC) MIN TYP MAX UNITS

∆VPS = ±1.2V A -40 - 4 8 µA/V
Inverting Input Resistance C 25 - 60 - Ω
Input Capacitance C 25 - 1.6 - pF
Input Voltage Common Mode Range

(Implied by VIO CMRR, +RIN, and -I
tests)

BIAS

CMS

A 25, 85 ±1.8 ±2.4 - V
A -40 ±1.2 ±1.7 - V

Input Noise Voltage Density f = 100kHz B 25 - 3.5 - nV/√Hz
Non-Inverting Input Noise Current Density f = 100kHz B 25 - 2.5 - pA/√Hz
Inverting Input Noise Current Density f = 100kHz B 25 - 20 - pA/√Hz

TRANSFER CHARACTERISTICS

Open Loop Transimpedance Gain AV = -1 C 25 - 500 - kΩ
AC CHARACTERISTICS AV = +2, RF = 464Ω, Unless Otherwise Specified

-3dB Bandwidth (V

OUT

= 0.2V

)A

P-P

= +1, +RS= 432Ω B 25 - 280 - MHz

V

AV = +2 B 25 - 400 - MHz

AV = -1, RF= 332Ω B 25 - 360 - MHz
Full Power Bandwidth

(V

=5V

at AV= +2/-1,

P-P

at AV = +1)

4V

OUT

P-P

AV = +1, RS= 432Ω B 25 - 140 - MHz

AV = +2 B 25 - 125 - MHz

AV = -1, RF= 332Ω B 25 - 180 - MHz
Gain Flatness (AV = +2,V

OUT

= 0.2V

) To 25MHz B 25 - ±0.02 - dB

P-P

To 50MHz B 25 - ±0.03 - dB
Minimum Stable Gain A Full - 1 - V/V
Crosstalk 5MHz B 25 - -60 - dB

10MHz B 25 - -54 - dB
OUTPUT CHARACTERISTICS RF = 560Ω, Unless Otherwise Specified
Output Voltage Swing AV= -1, RL= 100Ω A25±3 ±3.4 - V

A Full ±2.8 ±3- V

Output Current AV = -1, RL = 50Ω A 25, 85 50 60 - mA

A -40 28 42 - mA
Output Short Circuit Current B 25 - 90 - mA
Closed Loop Output Impedance DC, AV = +2, RF = 464Ω B 25 - 0.07 - Ω
Second Harmonic Distortion

(AV= +2, RF= 464Ω, V

OUT

Third Harmonic Distortion
(AV= +2, RF= 464Ω, V

OUT

=2V

=2V

P-P

P-P

)

)

10MHz B 25 - -50 - dBc
20MHz B 25 - -45 - dBc
10MHz B 25 - -55 - dBc

20MHz B 25 - -50 - dBc
TRANSIENT CHARACTERISTICS AV = +2, RF = 464Ω, Unless Otherwise Specified
Rise and Fall Times (V

OUT

= 0.5V

) Rise Time B 25 - 0.8 - ns

P-P

Fall Time B 25 - 1.25 - ns

3

HFA1205

Electrical Specifications V

PARAMETER TEST CONDITIONS

Overshoot V

Slew Rate
(V

= 4V

OUT

Slew Rate (V

Slew Rate
(V

OUT

Settling Time (V

Overdrive Recovery Time VIN = ±2V B 25 - 10 - ns
VIDEO CHARACTERISTICS AV = +2, RF = 464Ω, Unless Otherwise Specified
Differential Gain (f = 3.58MHz) RL = 150Ω B 25 - 0.03 - %

Differential Phase (f = 3.58MHz) RL = 150Ω B 25 - 0.03 - Degrees

POWER SUPPLY CHARACTERISTICS

Power Supply Range C 25 ±4.5 - ±5.5 V
Power Supply Current A 25 5.6 5.8 6.1 mA/

NOTE:

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

, AV = +1, +RS = 432Ω)

P-P

= 5V

OUT

= 5V

, AV = -1, RF = 332Ω)

P-P

= +2V to 0V step) To 0.1% B 25 - 15 - ns

OUT

, AV = +2) +SR B 25 - 1375 - V/µs

P-P

= ±5V, AV = +1, RF = 560Ω, RL = 100Ω, Unless Otherwise Specified (Continued)

SUPPLY

(NOTE 3)

TEST

LEVEL

= 0.5V

OUT

VIN t

RISE

+SR B 25 - 1050 - V/µs

-SR B 25 - 750 - V/µs

-SR B 25 - 875 - V/µs

+SR B 25 - 2250 - V/µs

-SR B 25 - 1275 - V/µs

To 0.05% B 25 - 20 - ns

To 0.02% B 25 - 30 - ns

RL = 75Ω B 25 - 0.03 - %

RL = 75Ω B 25 - 0.05 - Degrees

P-P

= 2.5ns

,

B 25-5- %

A Full 5.4 5.9 6.3 mA/

TEMP.

(oC) MIN TYP MAX UNITS

Op Amp

Op Amp

Application Information

Optimum Feedback Resistor

Although a current feedback amplifier’s bandwidth dependency
on closed loop gain isn’t as severeas that of a voltage feedback
amplifier,therecanbe an appreciable decrease in bandwidth at
higher gains. This decrease may be minimized b y taking
advantage of the current feedback amplifier’s unique
relationship between bandwidth and R
amplifiers require a feedback resistor, even for unity gain
applications, and R

, in conjunction with the internal

F

compensation capacitor, sets the dominant pole of the
frequency response. Thus, the amplifier’ s bandwidth is
inversely proportional to R
for a 464Ω R

at a gain of +2. Decreasing RF decreases

F

. The HF A1205 design is optimized

F

stability, resulting in excessive peaking and overshoot (Note:
Capacitive feedbac k will cause the same problems due to the
feedback impedance decrease at higher frequencies). At

4

. All current feedback

F

higher gains the amplifier is more stable, so R

can be

F

decreased in a trade-off of stability for bandwidth.
The table below lists recommended R

values for v arious

F

gains, and the expected bandwidth. For good channel-to­channel gain matching, it is recommended that all resistors
(termination as well as gain setting) be ±1% tolerance or better.
Note that a series input resistor, on +IN, is required fora gain of
+1, to reduce gain peaking and increase stability.

GAIN

(ACL)R

-1 332 360
+1 464 (+RS = 432Ω) 280
+2 464 400

F

(Ω)

BANDWIDTH

(MHz)

HFA1205

Non-inverting Input Source Impedance

For best operation, the DC source impedance seen by the
non-inverting input should be ≥50Ω. This is especially
important in inverting gain configurations where the non­inverting input would normally be connected directly to GND.

PC Board Layout

The frequency response of this amplifier depends greatly 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 value
(0.1µF) chip capacitor works well in most cases.

Terminated microstrip signal lines are recommended at the
input and output of the device. Capacitance directly on the
output must be minimized, or isolated as discussed in the
next section.

Care must also be taken to minimize the capacitance to
ground seen by the amplifier’s inverting input (-IN). 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 -IN, and connections to -IN should be
kept as short as possible.

50

40

30

20

10

SERIES OUTPUT RESISTANCE (Ω)

0

0 100 200 300 400

LOAD CAPACITANCE (pF)

FIGURE 1. RECOMMENDED SERIES OUTPUT RESISTOR vs

LOAD CAPACITANCE

AV = +1

AV = +2

150 250 35050

Evaluation Board

The performance of the HFA1205 may be evaluated using
the HA5023 Evaluation Board. The feedback and gain
setting resistors must be replaced with the appropriate value
(see “Optimum Feedback Resistor” section) for the gain
being evaluated. Also, replace the two 0Ω series output
resistors with 50Ω resistors.

To order evaluation boards (Part Number HA5023EVAL),
please contact your local sales office.

Driving Capacitive Loads

Capacitive loads, such as an A/D input, or an improperly
terminated transmission line will degrade the amplifier’s
phase margin resulting in frequency response peaking and
possible oscillations. In most cases, the oscillation can be
avoided by placing a resistor (R
prior to the capacitance.

Figure 1 details starting points for the selection of this
resistor. The points on the curve indicate the R
combinations for the optimum bandwidth, stability, and
settling time, but experimental fine tuning is recommended.
Picking a point above or to the right of the curve yields an
overdampedresponse,while points below or left of the curve
indicate areas of underdamped performance.

R

and CLform a low pass network at the output, thus

S

limiting system bandwidth well below the amplifier
bandwidth of 280MHz (for A
C

increases (as illustrated in the curves), the maximum

L

bandwidth is obtained without sacrificing stability. In spite
of this, bandwidth decreases as the load capacitance
increases. For example, at A
the overall bandwidth is limited to 180MHz, and bandwidth
drops to 70MHz at A

= +1, RS = 8Ω, CL = 400pF.

V

) in series with the output

S

and C

S

= +1). By decreasing RS as

V

= +1, RS=62Ω, CL= 40pF,

V

L

5

HFA1205

Typical Performance Curves

200

A

= +2

V

150

100

50

0

-50

-100

OUTPUT VOLTAGE (mV)

-150

-200

FIGURE 2. SMALL SIGNAL PULSE RESPONSE FIGURE 3. LARGE SIGNAL PULSE RESPONSE

V

= 200mV

OUT

3
0

-3

-6

NORMALIZED GAIN (dB)

1 10 100 1000

TIME (5ns/DIV.)

P-P

AV = +2
AV = +1

AV = +2

AV = -1

AV = +1

FREQUENCY (MHz)

V

= ±5V , RF = Optimum Value From “Apps Info” T able, TA = 25oC, RL = 100Ω,

SUPPLY

Unless Otherwise Specified

AV = -1

+180
+90
0

-90

-180
NORMALIZED PHASE (DEGREES)

2.0
AV = +2

1.5

1.0

0.5

0

-0.5

OUTPUT VOLTAGE (V)

-1.0

-1.5

-2.0

3
0

-3

-6

NORMALIZED GAIN (dB)

TIME (5ns/DIV.)

10 100

FREQUENCY (MHz)

AV = -1

AV = +1
AV = +2

30010.3

FIGURE 4. FREQUENCY RESPONSE FIGURE 5. FULL POWER BANDWIDTH

V

= 200mV

OUT

0.3

0.2

0.1
0

-0.1

-0.2

NORMALIZED GAIN (dB)

-0.3

1 10 100

P-P

AV = +2

FREQUENCY (MHz)

FIGURE 6. GAIN FLATNESS FIGURE 7. CROSSTALK vs FREQUENCY

6

AV = +1

-40

-45

-50

-55

-60

-65

-70

CROSSTALK (dB)

-75

-80

-85

RL = 100Ω

RL = 1kΩ

1 10 1000.3

FREQUENCY (MHz)

Die Characteristics

HFA1205

DIE DIMENSIONS:

69 mils x 92 mils x 19 mils
1750µm x 2330µm x 483µm

METALLIZATION:

Type: Metal 1: AICu(2%)/TiW
Thickness: Metal 1: 8k

Å ±0.4kÅ

Type: Metal 2: AICu(2%)
Thickness: Metal 2: 16k

Å ±0.8kÅ

Metallization Mask Layout

NC

-IN1

HFA1205

OUT1

SUBSTRATE POTENTIAL (Powered Up):

Floating (Recommend Connection to V-)

PASSIVATION:

Type: Nitride
Thickness: 4k

Å ±0.5kÅ

TRANSISTOR COUNT:

180

NC

V+

+IN1

NC

NC

V-

NC

+IN2

OUT2

-IN2

NC

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Intersil semiconductor products are sold by description only .Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time with­out notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.

For information regarding Intersil Corporation and its products, see web site http://www.intersil.com

7