LTC1966CMS8 Linear Technology, LTC1966CMS8 Datasheet - Page 28

• Manufacturer Part Number: LTC1966CMS8
• Description: IC PREC RMS/DC CONV MCRPWR 8MSOP
• Manufacturer: Linear Technology

Specifications of LTC1966CMS8

• Current - Supply: 155µA
• Voltage - Supply: 2.7 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

APPLICATIO S I FOR ATIO
LTC1966
7. Output is noisy with >10kHz inputs.
8. Large errors occur at crest factors approaching, but
9. Screwy results, errors > spec limits, typically 1% to 5%.
28
– This is a fundamental characteristic of this topol-
less than 4.
– Insufficient averaging.
– High impedance (85k ) and high accuracy (0.1%)
ogy. The LTC1966 is designed to work very well
with inputs of 1kHz or less. It works okay as high as
1MHz, but it is limited by aliased
Solution: Bandwidth limit the input or digitally filter
the resulting output.
Solution: Increase C
DC Waveforms” section for discussion of output
droop.
require clean boards! Flux residue, finger grime, etc.
all wreak havoc at this level.
Solution: Wash the board.
U
KEEP BOARD CLEAN
LTC1966
AVE
U
. See “Crest Factor and AC +
W
noise.
U
10. Gain is low by 1% or more, no other problems.
– Probably due to circuit loading. With a DMM or a
– Loading can also be caused by cheap averaging
10 scope probe, Z
output is 85k , resulting in – 0.85% gain error.
Output impedance is higher with the DC accurate
post filter.
Solution: Remove the shunt loading or buffer the
output.
capacitors.
Solution: Use a high quality metal film capacitor
for C
AVE
V
OUT
.
OUT RTN
LTC1966
LOADING DRAGS DOWN GAIN
85k
5
6
IN
200mV
= 10M . The LTC1966
10M
–0.85%
RMS
DMM
IN
1966 TS10
DCV
mV
sn1966 1966fas