ba3121f ROHM Co. Ltd., ba3121f Datasheet - Page 7

• Manufacturer Part Number: ba3121f
• Description: Ground Isolation Amplifier
• Manufacturer: ROHM Co. Ltd.

Applications
Cautions on use
(1) Numbers and data in entries
(2) Example application circuit
(3) Absolute maximum ratings
(4) GND potential
(5) Thermal design
(6) Short circuit between terminals and erroneous mounting
(7) Operation in strong electromagnetic field
(8) Ripple removal characteristics
(9) CMRR
Numbers and data in entries are representative design values and are not guaranteed values of the items.
Setting the capacitor to the double or half will change the CMRR to a low range of +6dB or -6dB (Fig. 10).
Although ROHM is confident that the example application circuit reflects the best possible recommendations, be sure to
verify circuit characteristics for your particular application. Modification of constants for other externally connected
circuits may cause variations in both static and transient characteristics for external components as well as this Rohm IC.
Allow for sufficient margins when determining circuit constants.
Use of the IC in excess of absolute maximum ratings, such as the applied voltage or operating temperature range (Topr),
may result in IC damage. Assumptions should not be made regarding the state of the IC (short mode or open mode)
when such damage is suffered. A physical safety measure, such as a fuse, should be implemented when using the IC at
times where the absolute maximum ratings may be exceeded.
Ensure a minimum GND pin potential in all operating conditions. Make sure that no pins are at a voltage below the
GND at any time, regardless of whether it is a transient signal or not.
Perform thermal design, in which there are adequate margins, by taking into account the power dissipation (Pd) in actual
states of use.
Pay attention to the assembly direction of the ICs. Wrong mounting direction or shorts between terminals, GND, or
other components on the circuits, can damage the IC.
Using the ICs in a strong electromagnetic field can cause operation malfunction.
The capacitors of pin 2 (Vm
Maintaining this ratio will not cause the ripple removal rate to reduce significantly, even if the capacitance reduces to half.
1
), and pin 6 (Vm
Fig.16
2
) should maintain a ratio of 2:1 for ripple removal characteristics.
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