25
LTC1968
1968f
APPLICATIO S I FOR ATIO
U
U
U
7.Output is noisy with >200kHz inputs.
This is a fundamental characteristic of this topol-
ogy. The LTC1968 is designed to work very well
with inputs of 100kHz or less. It works okay as high
as1MHz, but it is limited by aliased ?noise.
Solution: Bandwidth limit the input or digitally filter
the resulting output.
8.Large errors occur at crest factors approaching, but
less than 4.
Insufficient averaging.
Solution: Increase C
AVE
. See Crest Factor and AC +
DC Waveforms section for discussion of output
droop.
9.Screwy results, errors > spec limits, typically 1% to 5%.
High impedance (12.5k&) and high accuracy (0.1%)
require clean boards! Flux residue, finger grime, etc.
all wreak havoc at this level.
Solution: Wash the board.
10.Gain is low by E1% or more, no other problems.
Probably due to circuit loading. With a DMM or a
10?scope probe, Z
IN
= 10M&. The LTC1968
output is 12.5k&, resulting in 0.125% gain
error. Output impedance is higher with the DC
accurate post filter.
Solution: Remove the shunt loading or buffer the
output.
Loading can also be caused by cheap averaging
capacitors.
Solution: Use a high quality metal film capacitor
for C
AVE
.
LTC1968
KEEP BOARD CLEAN
1968 TS09
200mV
RMS
IN
0.125%
DMM
DCV
LTC1968
10M
5
12.5k
6
V
OUT
OUT RTN
1968 TS10
LOADING DRAGS DOWN GAIN
mV
发布紧急采购，3分钟左右您将得到回复。
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