Quad 125MHz Video Current
Feedback Amplifier with Disable
The HA5024 is a quad version of the popular Intersil
HA5020. It features wide bandwidth and high slew rate, and
is optimized for video applications and gains between 1 and
10. It is a current feedback amplifier and thus yields less
bandwidth degradation at high closed loop gains than
voltage feedback amplifiers.
The low differentialgainandphase,0.1dBgainflatness, and
ability to drive two back terminated 75Ω cables, make this
amplifier ideal for demanding video applications.
The HA5024 also features a disable function that
significantly reduces supply current while forcing the output
to a true high impedance state. This functionality allows 2:1
and 4:1 video multiplexers to be implemented with a single IC.
The current feedback design allows the user to take
advantage of the amplifier’s bandwidth dependency on the
feedback resistor. By reducing R
, the bandwidth can be
F
increased to compensate for decreases at higher closed
loop gains or heavy output loads.
Supply Voltage Range (Typical). . . . . . . . . . . . . . . . . ±4.5V to ±15V
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. Maximum power dissipation, including output load, must be designed tomaintain junction temperature below 175oC for die, and below 150oC
for plastic packages. See Application Information section for safe operating area information.
2. θJA is measured with the component mounted on an evaluation PC board in free air.
3. The non-inverting input of unused amplifiers must be connected to GND.
4. Output is protected for short circuits to ground.Brief short circuits to ground will not degrade reliability, however,continuous (100% duty cycle)
output current should not exceed 15mA for maximum reliability.
Disable Pin Input Current
Minimum Pin 8 Current to DisableNote 6AFull350--µA
Maximum Pin 8 Current to EnableNote 7AFull--20µA
AC CHARACTERISTICS (AV = +1)
Slew RateNote 8B25275350-V/µs
Full Power BandwidthNote 9B252228-MHz
Rise TimeNote 10B25-6-ns
Fall TimeNote 10B25-6-ns
Propagation DelayNote 10B25-6-ns
OvershootB25-4.5-%
-3dB BandwidthV
Settling Time to 1%2V Output StepB25-50-ns
Settling Time to 0.25%2V Output StepB25-75-ns
5. VCM = ±2.5V. At -40oC Product is tested at VCM = ±2.25V because short test duration does not allow self heating.
6. RL= 100Ω,VIN= 2.5V. This is the minimum current which must bepulled out of the Disable pin in order to disable the output. The output is
considered disabled when -10mV ≤ V
OUT
≤ +10mV.
7. VIN= 0V. This is the maximum current thatcan be pulled out of the Disable pin with the HA5024 remaining enabled. The HA5024is
considered disabled when the supply current has decreased by at least 0.5mA.
8. V
9..
10. RL= 100Ω,V
switches from -2V to +2V, orfrom +2V to -2V. Specification is from the 25% to 75% points.
OUT
Slew Rate
FPBW
---------------------------- -
2πV
;V
PEAK
OUT
PEAK
= 1V. Measured from 10% to 90% pointsfor rise/fall times; from 50% points of input and output for propagation delay.
2V==
11. A. Production Tested; B. Typical or Guaranteed Limit based on characterization; C. Design Typical for information only.
12. VIN = +2V, DISABLE = +5V to 0V. Measured from the 50% point of DISABLE to V
13. VIN = +2V, DISABLE = 0V to +5V. Measured from the 50% point of DISABLE to V
14. VIN = 0V, Force V
from 0V to ±2.5V, tR = tF = 50ns, DISABLE = 0V.
OUT
OUT
OUT
= 0V.
= 2V.
15. Measured with a VM700A video tester using an NTC-7 composite VITS.
16. V
= ±2.5V. At -40oC Product is tested at V
OUT
= ±2.25V because short test duration does not allow self heating.
OUT
4
Test Circuits and Waveforms
HA5024
50Ω
+
-
DUT
HP4195
NETWORK
ANALYZER
50Ω
FIGURE 1. TEST CIRCUIT FOR TRANSIMPEDANCE MEASUREMENTS
(NOTE 17)
(NOTE 17)
V
IN
100Ω
50Ω
DUT
+
-
RF, 1kΩ
R
L
100Ω
V
OUT
FIGURE 2. SMALL SIGNAL PULSE RESPONSE CIRCUIT
V
IN
FIGURE 3. LARGE SIGNAL PULSE RESPONSE CIRCUIT
100Ω
50Ω
R
681Ω
I
DUT
+
-
RF, 681Ω
R
L
400Ω
V
OUT
NOTE:
17. A series input resistor of ≥100Ω is recommended to limit input currents in case input signals are present before the HA5024 is powered up.
Vertical Scale: VIN= 100mV/Div., V
Horizontal Scale: 20ns/Div.
FIGURE 4. SMALL SIGNAL RESPONSE
5
= 100mV/Div.
OUT
Vertical Scale: VIN = 1V/Div., V
OUT
= 1V/Div.
Horizontal Scale: 50ns/Div.
FIGURE 5. LARGE SIGNAL RESPONSE
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