ISL28107 datasheet(20/31 Pages) RENESAS

20 / 31 page

ISL28107, ISL28207, ISL28407

FN6631 Rev 8.00

Page 20 of 31

September 29, 2015

The resistor-ESD diode configuration enables a wide differential

input voltage range equal to the lesser of the Maximum Supply

Voltage in the “Absolute Maximum Ratings” on page 6 (42V), or a

maximum of 0.5V beyond the V+ and V- supply voltage. The

internal protection resistors eliminate the need for external input

current limiting resistors in unity gain connections and other

circuit applications where large voltages or high slew rate signals

are present. Although the amplifier is fully protected, high input

slew rates that exceed the amplifier slew rate (±0.32V/µs) may

cause output distortion.

Output Current Limiting

The output current is internally limited to approximately ±40mA

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 one amplifier at a time for the dual op-amp. Continuous

operation under these conditions may degrade long-term

reliability.

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 ISL28107, ISL28207 and ISL28407 are immune to

output phase reversal, even when the input voltage is 1V beyond

the supplies.

Unused Channels

If the application only requires one channel, the user must

configure the unused channels to prevent them from oscillating.

The unused channels can oscillate 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 (TJMAX) for all applications to determine if power

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:

•PDMAXTOTAL is the sum of the maximum power dissipation of

each amplifier in the package (PDMAX)

PDMAX for each amplifier can be calculated using Equation 2:

where:

•TMAX = Maximum ambient temperature

•

JA = Thermal resistance of the package

•PDMAX = Maximum power dissipation of one amplifier

•VS = Total supply voltage

•IqMAX = Maximum quiescent supply current of one amplifier

•VOUTMAX = Maximum output voltage swing of the application

•RL = Load resistance

ISL28107, ISL28207, ISL28407 SPICE Model

Figure 56 shows the SPICE model schematic, and Figure 57 shows

the net list for the ISL28107, ISL28207 and ISL28407 SPICE

model. 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. AVOL is adjusted for 155dB with the

dominant pole at 0.01Hz. CMRR is set (145dB, fcm = 100Hz). The

input stage models the actual device to 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.

License Statement

The information in this SPICE model is protected under the

United States copyright laws. Intersil Corporation hereby grants

users of this macro-model hereto referred to as “Licensee”, a

nonexclusive, nontransferable licence to use this model as long

as the Licensee abides by the terms of this agreement. Before

using this macro-model, the Licensee should read this license. If

the Licensee does not accept these terms, permission to use the

model is not granted.

The Licensee may not sell, loan, rent, or license the macro-model,

in whole, in part, or in modified form, to anyone outside the

Licensee’s company. The Licensee may modify the macro-model

to suit his/her specific applications, and the Licensee may make

copies of this macro-model for use within their company only.

This macro-model is provided “AS IS, WHERE IS, AND WITH NO

WARRANTY OF ANY KIND EITHER EXPRESSED OR IMPLIED,

INCLUDING BUY NOT LIMITED TO ANY IMPLIED WARRANTIES OF

MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.”

In no event will Intersil be liable for special, collateral, incidental, or

consequential damages in connection with or arising out of the

use of this macro-model. Intersil reserves the right to make

changes to the product and the macro-model without prior notice.

FIGURE 55. PREVENTING OSCILLATIONS IN UNUSED CHANNELS

TJMAX

TMAX JAxPDMAXTOTAL

(EQ. 1)

PDMAX

VS IqMAX VS



- VOUTMAX

VOUTMAX

----------------------------



(EQ. 2)

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