SHC804 Datasheet, PDF (5/5 Pages) Burr-Brown (TI) – High Speed SAMPLE/HOLD AMPLIFIER

OUTPUT LOADING
Care must be taken when loading the output of the SHC804
to avoid possible oscillations, current limiting and perfor-
mance variations over temperature.
The maximum capacitive load to avoid oscillations is about
300pF. Recommended resistive load is 500Ω or more, al-
though values as low as 250Ω may be used. Acquisition and
sample-to-hold settling times are relatively unaffected by
resistive loads down to 250Ω in parallel with capacitive
loads up to 100pF. Higher capacitances will affect acquisi-
tion and settling times.
ANALOG SIGNAL SOURCE CONSIDERATIONS
The output impedance of the signal source driving the
SHC804 will affect the accuracy of the sample and hold
operation both statically (at DC) and dynamically. The
output impedance of the signal source should be low and
remain low over a wide bandwidth. A small capacitor at the
driving source may help to improve the charge offset errors
that are affected by dynamic source impedance.
®
5
SHC804