參數(shù)資料
型號: LTC1968IMS8#TRPBF
廠商: Linear Technology
文件頁數(shù): 25/28頁
文件大?。?/td> 296K
描述: IC CONVERTER RMS-DC PREC 8MSOP
標(biāo)準(zhǔn)包裝: 2,500
電流 - 電源: 2.3mA
電源電壓: 5.0V
安裝類型: 表面貼裝
封裝/外殼: 8-TSSOP,8-MSOP(0.118",3.00mm 寬)
供應(yīng)商設(shè)備封裝: 8-MSOP
包裝: 帶卷 (TR)
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
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