LTC1966CMS8#TRPBF Linear Technology, LTC1966CMS8#TRPBF Datasheet - Page 33

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

Specifications of LTC1966CMS8#TRPBF

• 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: Lead free / RoHS Compliant

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%.
applicaTions inForMaTion
– This is a fundamental characteristic of this topol-
less than 4.
– Insufficient averaging.
– High impedance (85kΩ) 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 ∆S noise.
Solution: Bandwidth limit the input or digitally filter
the resulting output.
Solution: Increase C
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.
Helpful Hint: Sensitivity to leakages can be reduced
significantly through the use of guard traces.
KEEP BOARD CLEAN
AVE
LTC1966
. See Crest Factor and AC + DC
10. Gain is low by ≅1% or more, no other problems.
– Probably due to circuit loading. With a DMM or
– Loading can also be caused by cheap averaging
a 10× scope probe, Z
output is 85kΩ, 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
200mV
IN
10M
–0.85%
= 10MΩ. The LTC1966
RMS
DMM
IN
1966 TS10
DCV
mV
LTC1966
33
1966fb