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參數(shù)資料
| 型號(hào)： | LTTJ |
| 廠商： | Linear Integrated Systems |
| 英文描述： | Precision Extended Bandwidth, RMS-to-DC Converter |
| 中文描述： | 精密擴(kuò)展帶寬，有效值- DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 25/28頁 |
| 文件大?。?/td> | 328K |
| 代理商： | LTTJ |
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LTC1967
1967f
APPLICATIOU
7. Output is noisy with >50kHz inputs.
– This is a fundamental characteristic of this topol-
ogy. The LTC1967 is designed to work very well
with inputs of 20kHz or less. It works okay as high
as1MHz, but it is limited by aliased
Σ
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 (50k
) and high accuracy (0.1%)
require clean boards! Flux residue, finger grime, etc.
all wreak havoc at this level.
Solution: Wash the board.
W
U
U
10. Gain is low by
1% or more, no other problems.
– Probably due to circuit loading. With a DMM or a
10
×
scope probe, Z
IN
= 10M
. The LTC1967
output is 50k
, resulting in –0.5% 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
.
LTC1967
KEEP BOARD CLEAN
1967 TS09
200mV
IN
–0.5%
DMM
DCV
LTC1967
10M
5
50k
6
V
OUT
OUT RTN
1967 TS10
LOADING DRAGS DOWN GAIN
mV
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