CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE:
1.
JA
is measured with the component mounted on an evaluation PC board in free air.
Electrical Specifications
V
SUPPLY
=
5V,
A
V
= +1, R
F
= 510 , R
L
= 100 , Unless Otherwise Specified
TEST
CONDITIONS
(NOTE 2)
TEST
LEVEL
TEMP.
(°C)
PARAMETER
INPUT CHARACTERISTICS
Input Offset Voltage (Note 3)
MIN
TYP
MAX
UNITS
A
A
25
Full
Full
25
Full
25
Full
25
Full
Full
25
Full
25
Full
Full
25
Full
25
Full
25
25
25
Full
25
25
25
-
-
-
40
38
45
42
-
-
-
-
-
-
-
-
-
-
-
-
25
-
-
2.5
-
-
-
2
-
10
46
-
50
-
25
-
40
20
-
12
-
40
1
-
6
-
50
20
2
3.0
4
18
21
6
10
-
-
-
-
-
40
65
-
40
50
50
60
-
7
10
15
27
-
30
-
-
-
-
-
mV
mV
V/°C
dB
dB
dB
dB
A
A
nA/°C
A/V
A/V
A
A
nA/°C
A/V
A/V
A/V
A/V
k
pF
V
nV/Hz
pA/Hz
pA/Hz
Input Offset Voltage Drift
V
IO
CMRR
V
CM
=
2V
V
S
=
1.25V
C
A
A
V
IO
PSRR
A
A
Non-Inverting Input Bias Current
(Note 3)
+I
BIAS
Drift
+I
BIAS
CMS
+IN = 0V
A
A
C
V
CM
=
2V
A
A
Inverting Input Bias Current (Note 3)
-IN = 0V
A
A
-I
BIAS
Drift
-I
BIAS
CMS
V
CM
=
2V
V
S
=
1.25V
C
A
A
-I
BIAS
PSS
A
A
Non-Inverting Input Resistance
Inverting Input Resistance
Input Capacitance (Either Input)
Input Common Mode Range
Input Noise Voltage (Note 3)
+Input Noise Current (Note 3)
-Input Noise Current (Note 3)
TRANSFER CHARACTERISTICS
100kHz
100kHz
100kHz
A
C
B
C
B
B
B
A
V
= +2, Unless Otherwise Specified
B
25
-
300
-
k
Open Loop Transimpedance (Note 3)
FN2945 Rev.9.00
October 26, 2004
Page 2 of 10
HFA1100
Electrical Specifications
HFA1100
V
SUPPLY
=
5V,
A
V
= +1, R
F
= 510 , R
L
= 100 , Unless Otherwise Specified
(Continued)
TEST
CONDITIONS
V
OUT
= 0.2V
P-P
,
A
V
= +1
V
OUT
= 0.2V
P-P
,
A
V
= +2, R
F
= 360
V
OUT
= 4V
P-P
,
A
V
= -1
To 100MHz
To 50MHz
To 30MHz
DC to 100MHz
NTSC, R
L
= 75
NTSC, R
L
= 75
(NOTE 2)
TEST
LEVEL
B
B
B
B
B
B
B
B
B
A
A
V
= +2, Unless Otherwise Specified
A
V
= -1
A
A
25
Full
25, 85
-40
25
25
25
25
25
3.0
2.5
50
35
-
-
-
20
15
3.3
3.0
60
50
0.07
-56
-80
30
20
-
-
-
-
-
-
-
-
-
V
V
mA
mA
dBc
dBc
dBm
dBm
TEMP.
(°C)
25
25
25
25
25
25
25
25
25
Full
PARAMETER
-3dB Bandwidth (Note 3)
-3dB Bandwidth
Full Power Bandwidth
Gain Flatness (Note 3)
Gain Flatness
Gain Flatness
Linear Phase Deviation (Note 3)
Differential Gain
Differential Phase
Minimum Stable Gain
OUTPUT CHARACTERISTICS
Output Voltage (Note 3)
MIN
530
-
-
-
-
-
-
-
-
1
TYP
850
670
300
0.14
0.04
0.01
0.6
0.03
0.05
-
MAX
-
-
-
-
-
-
-
-
-
-
UNITS
MHz
MHz
MHz
dB
dB
dB
Degrees
%
Degrees
V/V
Output Current
R
L
= 50, A
V
= -1
A
A
DC Closed Loop Output Impedance
(Note 3)
2nd Harmonic Distortion (Note 3)
3rd Harmonic Distortion (Note 3)
3rd Order Intercept (Note 3)
1dB Compression
30MHz, V
OUT
= 2V
P-P
30MHz, V
OUT
= 2V
P-P
100MHz
100MHz
B
B
B
B
B
TRANSIENT RESPONSE
A
V
= +2, Unless Otherwise Specified
Rise Time
Overshoot (Note 3)
Slew Rate
Slew Rate
0.1% Settling (Note 3)
0.2% Settling (Note 3)
Overdrive Recovery Time
POWER SUPPLY CHARACTERISTICS
Supply Voltage Range
Supply Current (Note 3)
B
A
A
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.
Full
25
Full
4.5
-
-
-
21
-
5.5
26
33
V
mA
mA
V
OUT
= 2.0V Step
V
OUT
= 2.0V Step
A
V
= +1, V
OUT
= 5V
P-P
A
V
= +2, V
OUT
= 5V
P-P
V
OUT
= 2V to 0V
V
OUT
= 2V to 0V
2X Overdrive
B
B
B
B
B
B
B
25
25
25
25
25
25
25
-
-
-
1850
-
-
-
900
10
1400
2300
11
7
7.5
-
-
-
-
-
-
10
ps
%
V/s
V/s
ns
ns
ns
FN2945 Rev.9.00
October 26, 2004
Page 3 of 10
HFA1100
HFA1100
Use of Die in Hybrid Applications
This amplifier is designed with compensation to negate the
package parasitics that typically lead to instabilities. As a
result, the use of die in hybrid applications results in
overcompensated performance due to lower parasitic
capacitances. Reducing R
F
below the recommended values
for packaged units will solve the problem. For A
V
= +2 the
recommended starting point is 300, while unity gain
applications should try 400.
Application Information
Optimum Feedback Resistor (R
F
)
The enclosed plots of inverting and non-inverting frequency
response detail the performance of the HFA1100 in various
gains. Although the bandwidth dependency on A
CL
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 R
F
. All current feedback amplifiers require a
feedback resistor, even for unity gain applications, and the
R
F
, in conjunction with the internal compensation capacitor,
sets the dominant pole of the frequency response. Thus, the
amplifier’s bandwidth is inversely proportional to R
F
. The
HFA1100 design is optimized for a 510 R
F
, at a gain of +1.
Decreasing R
F
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 R
F
can be
decreased in a trade-off of stability for bandwidth. The table
below lists recommended R
F
values for various gains, and the
expected bandwidth.
A
CL
+1
-1
+2
+5
+10
+19
R
F
()
510
430
360
150
180
270
BW (MHz)
850
580
670
520
240
125
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 (10F) tantalum in parallel with a small value
chip (0.1F) 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 inverting 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 layout is the
Evaluation Board shown below.
5V Single Supply Operation
This amplifier operates at single supply voltages down to
4.5V. The table below details the amplifier’s performance
with a single 5V supply. The dramatic supply current
reduction at this operating condition (refer also to Figure 23)
makes these op amps even better choices for low power 5V
systems. Refer to Application Note AN9745 for further
information.
PARAMETER
Input Common Mode Range
-3dB BW (A
V
= +2)
Gain Flatness (to 50MHz, A
V
= +2)
Output Voltage (A
V
= -1)
Slew Rate (A
V
= +2)
0.1% Settling Time
Supply Current
TYP
1V to 4V
267MHz
0.05dB
1.3V to 3.8V
475V/s
17ns
5.5mA
Evaluation Board
An evaluation board is available for the HFA1100 (Part
Number HFA11XXEVAL). Please contact your local sales
office for information.
FN2945 Rev.9.00
October 26, 2004
Page 4 of 10
HFA1100
The layout and schematic of the board are shown below:
