User Manual

Applications Information (Continued)
TL/H/11876–20
FIGURE 8. Buffering the Input with an LM6361 High Speed Op Amp
Correct converter operation will be obtained for input volt-
ages greater than AGND
b
50 mV and less than AV
CC
a
50 mV. Avoid driving the signal source more than 300 mV
higher than AV
CC
, or more than 300 mV below AGND. If an
analog input pin is forced beyond these voltages, the cur-
rent flowing through that pin should be limited to 25 mA or
less to avoid permanent damage to the IC. The sum of all
the overdrive currents into all pins must be less than 50 mA.
When the input signal is expected to extend more than
300 mV beyond the power supply limits for any reason (un-
known/uncontrollable input voltage range, power-on tran-
sients, fault conditions, etc.) some form of input protection,
such as that shown in
Figure 9, should be used.
TL/H/11876–21
FIGURE 9. Input Protection
14