ISL55001IBZ-T7 Intersil, ISL55001IBZ-T7 Datasheet - Page 8

• Manufacturer Part Number: ISL55001IBZ-T7
• Description: IC OPAMP 220MHZ UNITY-GAIN 8SOIC
• Manufacturer: Intersil

Specifications of ISL55001IBZ-T7

• Amplifier Type: Voltage Feedback
• Number Of Circuits: 1
• Slew Rate: 280 V/µs
• Gain Bandwidth Product: 70MHz
• -3db Bandwidth: 220MHz
• Current - Input Bias: 1.72µA
• Voltage - Input Offset: 60µV
• Current - Supply: 9mA
• Current - Output / Channel: 145mA
• 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: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -
• Other names: ISL55001IBZ-T7TR

Product Description
The ISL55001 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 220MHz.
Driving a 150Ω load and a gain of 2, the bandwidth is
about 90MHz while maintaining a 300V/µs slew rate.
The ISL55001 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
below the positive supply (V
outside the above specified range, it will cause the output
signal to be distorted.
The outputs of the ISL55001 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
optimum performance. If a large value of R
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
+1, optimum response is obtained with R
selection of R
selection).
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 ISL55001 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 the gain slightly. If the gain
S
F
F
F
= 0 is optimum. For the gains other than
= ±15V. As the load resistance becomes
and R
can help to reduce the ringing and
G
(see Figures 15 and 16 for
8
S
+ pin). If the input signal is
F
can't be very big for
S
- pin) to 1.5V
F
with proper
F
must be
ISL55001
PD
setting is greater than 1, the gain resistor R
be chosen to make up for any gain loss 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 ISL55001 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 ISL55001, 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 Equation 1:
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: For sourcing use Equation 2:
PD
MAX
JA
MAX
JMAX
AMAX
= Thermal resistance of the package
=
=
= Maximum junction temperature
T
-------------------------------------------- -
= Maximum ambient temperature
(V
JMAX
S
+
Θ
–
–
JA
V
T
S
AMAX
- )
×
I
SMAX
+
i
∑
=
n
1
(
V
S
+
–
V
OUTi
November 3, 2009
G
)
×
can then
(EQ. 1)
-------------------- -
R
V
LOADi
(EQ. 2)
OUTi
FN6200.3