ISL55004IBZ-T13 Intersil, ISL55004IBZ-T13 Datasheet - Page 8

• Manufacturer Part Number: ISL55004IBZ-T13
• Description: IC OPAMP QUAD 200MHZ 14-SOIC
• Manufacturer: Intersil

Specifications of ISL55004IBZ-T13

• Amplifier Type: Voltage Feedback
• Number Of Circuits: 4
• Slew Rate: 300 V/µs
• Gain Bandwidth Product: 70MHz
• -3db Bandwidth: 200MHz
• Current - Input Bias: 600nA
• Voltage - Input Offset: 1200µV
• Current - Supply: 8.5mA
• Current - Output / Channel: 140mA
• Voltage - Supply, Single/dual (±): 4.5 V ~ 30 V, ±2.25 V ~ 15 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -

Product Description
The ISL55004 is a wide bandwidth, low power, and low offset
voltage feedback operational amplifier. This device is
internally compensated for closed loop gain of +1 or greater.
Connected in voltage follower mode and driving a 500Ω
load, the -3dB bandwidth is around a 200MHz. Driving a
150Ω load and a gain of 2, the bandwidth is about 90MHz
while maintaining a 300V/µs slew rate.
The ISL55004 is designed to operate with supply voltage
from +15V to -15V. That means for single supply application,
the supply voltage is from 0V to 30V. For split supplies
application, the supply voltage is from ±15V. The amplifier
has an input common-mode voltage range from 1.5V above
the negative supply (V
supply (V
specified range, it will cause the output signal to be distorted.
The outputs of the ISL55004 can swing from -12.75V to
+13.4V for V
lower, the output swing is lower.
Choice of Feedback Resistor and Gain Bandwidth
Product
For applications that require a gain of +1, no feedback
resistor is required. Just short the output pin to the inverting
input pin. For gains greater than +1, the feedback resistor
forms a pole with the parasitic capacitance at the inverting
input. As this pole becomes smaller, the amplifier's phase
margin is reduced. This causes ringing in the time domain
and peaking in the frequency domain. Therefore, R
very big for optimum performance. If a large value of R
must be used, a small capacitor in the few Pico Farad range
in parallel with R
peaking at the expense of reducing the bandwidth. For gain
of +1, R
optimum response is obtained with R
of R
Video Performance
For good video performance, an amplifier is required to
maintain the same output impedance and the same
frequency response as DC levels are changed at the output.
This is especially difficult when driving a standard video load
of 150Ω, because of the change in output current with DC
level. The dG and dP of this device is about 0.01% and
0.05°, while driving 150Ω at a gain of 2. Driving high
impedance loads would give a similar or better dG and dP
performance.
Driving Capacitive Loads and Cables
The ISL55004 can drive 47pF loads in parallel with 500Ω
with less than 3dB of peaking at gain of +1 and as much as
100pF at a gain of +2 with under 3db of peaking. If less
peaking is desired in applications, a small series resistor
(usually between 5Ω to 50Ω) can be placed in series with the
output to eliminate most peaking. However, this will reduce
F
and R
F
S
= 0 is optimum. For the gains other than +1,
+ pin). If the input signal is outside the above
G
S
(see Figures15 and 16 for selection).
= ±15V. As the load resistance becomes
F
can help to reduce the ringing and
S
- pin) to 1.5V below the positive
8
F
with proper selection
F
can't be
F
ISL55004
the gain slightly. If the gain setting is greater than 1, the gain
resistor R
which may be created by the additional series resistor at the
output.
When used as a cable driver, double termination is always
recommended for reflection-free performance. For those
applications, a back-termination series resistor at the
amplifier's output will isolate the amplifier from the cable and
allow extensive capacitive drive. However, other applications
may have high capacitive loads without a back-termination
resistor. Again, a small series resistor at the output can help
to reduce peaking.
Output Drive Capability
The ISL55004 does not have internal short circuit protection
circuitry. It has a typical short circuit current of 140mA. If the
output is shorted indefinitely, the power dissipation could
easily overheat the die or the current could eventually
compromise metal integrity. Maximum reliability is
maintained if the output current never exceeds ±60mA. This
limit is set by the design of the internal metal interconnect.
Note that in transient applications, the part is robust.
Short circuit protection can be provided externally with a
back match resistor in series with the output placed close as
possible to the output pin. In video applications this would be
a 75Ω resistor and will provide adequate short circuit
protection to the device. Care should still be taken not to
stress the device with a short at the output.
Power Dissipation
With the high output drive capability of the ISL55004, it is
possible to exceed the 150°C absolute maximum junction
temperature under certain load current conditions.
Therefore, it is important to calculate the maximum junction
temperature for an application to determine if load conditions
or package types need to be modified to assure operation of
the amplifier in a safe operating area.
The maximum power dissipation allowed in a package is
determined according to:
Where:
• T
• T
• θ
The maximum power dissipation actually produced by an IC
is the total quiescent supply current times the total power
supply voltage, plus the power in the IC due to the load, or:
PD
MAX
JA
AMAX
JMAX
= Thermal resistance of the package
=
G
= Maximum junction temperature
= Maximum ambient temperature
T
-------------------------------------------- -
can then be chosen to make up for any gain loss
JMAX
Θ
–
JA
T
AMAX
July 27, 2006
FN6219.2