ISL28417FBBZ-T7A Intersil, ISL28417FBBZ-T7A Datasheet - Page 20

• Manufacturer Part Number: ISL28417FBBZ-T7A
• Description: Operational Amplifiers - Op Amps ISL28417FBBZ QUAD 40 PREC LW PWR OPERTNL
• Manufacturer: Intersil

Specifications of ISL28417FBBZ-T7A

• Product Category: Operational Amplifiers - Op Amps
• Rohs: yes
• Number Of Channels: 4
• Common Mode Rejection Ratio (min): 120 dB
• Input Offset Voltage: 110 uV
• Input Bias Current (max): 1.5 nA
• Operating Supply Voltage: 4.5 V to 40 V, +/- 2.25 V to +/- 20 V
• Mounting Style: SMD/SMT
• Package / Case: SOIC-14
• Slew Rate: 0.5 V/us
• Shutdown: No
• Output Current: 43 mA
• Maximum Operating Temperature: + 125 C
• Gain Bandwidth Product: 1.5 MHz
• Minimum Dual Supply Voltage: +/- 2.25 V
• Minimum Operating Temperature: - 40 C
• Supply Current: 0.53 mA

In applications where one or both amplifier input terminals are at
risk of exposure to high voltages beyond the power supply rails,
current limiting resistors may be needed at the input terminal to
limit the current through the power supply ESD diodes to
20mA max.
Output Current Limiting
The output current is internally limited to approximately ±45mA
at +25°C and can withstand a short circuit to either rail as long
as the power dissipation limits are not exceeded. This applies to
only 1 amplifier at a time for the dual op amp. Continuous
operation under these conditions may degrade long term
reliability. Figures 27 and 28 show the current limit variation with
temperature.
Output Phase Reversal
Output phase reversal is a change of polarity in the amplifier
transfer function when the input voltage exceeds the supply
voltage. The ISL28117, ISL28217 and ISL28417 are immune to
output phase reversal, even when the input voltage is 1V beyond
the supplies.
Unused Channels
The ISL28217 is a dual op-amp. If the application only requires
one channel, the user must configure the unused channel to
prevent it from oscillating. The unused channel oscillates if the
input and output pins are floating. This results in higher than
expected supply currents and possible noise injection into the
channel being used. The proper way to prevent this oscillation is
to short the output to the inverting input and ground the positive
input, as shown in Figure 55.
Power Dissipation
It is possible to exceed the +150°C maximum junction
temperatures under certain load and power supply conditions. It
is therefore important to calculate the maximum junction
temperature (T
FIGURE 55. PREVENTING OSCILLATIONS IN UNUSED CHANNELS
JMAX
) for all applications to determine if power
+
20
-
ISL28117, ISL28217, ISL28417
supply voltages, load conditions, or package type need to be
modified to remain in the safe operating area. These parameters
are related using Equation 1:
where:
• P
• PD
where:
• T
• θ
• PD
• V
• I
• V
ISL28117, ISL28217 and ISL28417 SPICE
Model
Figure 56 shows the SPICE model schematic and Figure 57
shows the net list for the ISL28117, ISL28217 and ISL28417
SPICE model for a Grade “B” part. The model is a simplified
version of the actual device and simulates important AC and DC
parameters. AC parameters incorporated into the model are: 1/f
and flatband noise, Slew Rate, CMRR, Gain and Phase. The DC
parameters are VOS, IOS, total supply current and output voltage
swing. The model uses typical parameters given in the “Electrical
Specifications” Table beginning on page 6. The AVOL is adjusted
for 155dB with the dominate pole at 0.02Hz. The CMRR is set
(210dB, f
present an accurate AC representation. The model is configured
for ambient temperature of +25°C.
Figures 58 through 68 show the characterization vs simulation
results for the Noise Voltage, Closed Loop Gain vs Frequency,
Closed Loop Gain vs RL, Large Signal Step Response, Open Loop
Gain Phase and Simulated CMRR vs Frequency.
T
PD
JMAX
each amplifier in the package (PD
qMAX
MAX
MAX
JA
S
OUTMAX
DMAXTOTAL
MAX
MAX
= Total supply voltage
= Thermal resistance of the package
=
=
= Maximum ambient temperature
= Maximum quiescent supply current of 1 amplifier
T
cm
for each amplifier can be calculated using Equation 2:
= Maximum power dissipation of 1 amplifier
V
MAX
S
= Maximum output voltage swing of the application
= 10Hz). The input stage models the actual device to
×
+
I
qMAX
is the sum of the maximum power dissipation of
θ
JA
xPD
+
(
V
MAXTOTAL
S
- V
OUTMAX
MAX
)
×
V
------------------------
)
OUTMAX
R
L
November 30, 2012
FN6632.10
(EQ. 1)
(EQ. 2)