LTC1966CMS8#TRPBF Linear Technology, LTC1966CMS8#TRPBF Datasheet - Page 32

• 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

applicaTions inForMaTion
LTC1966
TROUBLESHOOTING GUIDE
Top Ten LTC1966 Application Mistakes
1. Circuit won’t work–Dead On Arrival–no power drawn.
2. Circuit won’t work, but draws power. Zero or
3. Screwy results, particularly with respect to linearity
32
– Probably forgot to enable the LTC1966 by pulling
very little output, single-ended input application.
– Probably didn’t connect both input pins.
or high crest factors; differential input application.
– Probably AC-coupled both input pins.
Solution: Make at least one input DC-coupled. See
Input Connections in the Design Cookbook.
Pin 8 low.
Solution: Tie Pin 8 to Pin 1.
Solution: Tie both inputs to something. See Input
Connections in the Design Cookbook.
DC CONNECT ONE INPUT
2
3
IN1
IN2
LTC1966
CONNECT PIN 3
NC
2
3
IN1
IN2
LTC1966
1966 TS02
DC CONNECT ONE INPUT
2
3
IN1
IN2
LTC1966
1966 TS03
4. Gain is low by a few percent, along with other screwy
5. Offsets perceived to be out of specification because 0V
6. Linearity perceived to be out of specification particularly
results.
– Probably tried to use output in a floating, differential
in ≠ 0V out.
– The offsets are not specified at 0V in. No RMS-to-DC
with small input signals.
– This could again be due to using 0V in as one of the
– The input offset voltage can cause small AC
manner.
Solution: Tie Pin 6 to a low impedance. See Output
Connections in the Design Cookbook.
converter works well at 0 due to a divide-by-zero
calculation.
Solution: Measure V
readings > ±5mV
measurement points.
Solution: Check Linearity from 5mV
linearity errors at low input amplitudes as well. See
Error Analyses section.
Possible Solution: Include a trim for input offset.
OUT RTN
LTC1966
V
OUT
DC
GROUND PIN 6
5
6
.
IOS
31
30
/V
HI
LO
TYPE 7136
OOS
ADC
1966 TS04
RMS
by extrapolating
to 500mV
RMS
1966fb
.