LTC1966HMS8-PBF View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC1966HMS8-PBF Datasheet PDF : 38 Pages
| |||
LTC1966
Applications Information
Troubleshooting Guide
Top Ten LTC1966 Application Mistakes
1. Circuit won’t work–Dead On Arrival–no power drawn.
– Probably forgot to enable the LTC1966 by pulling
Pin 8 low.
Solution: Tie Pin 8 to Pin 1.
2. Circuit won’t work, but draws power. Zero or
very little output, single-ended input application.
– Probably didn’t connect both input pins.
Solution: Tie both inputs to something. See Input
Connections in the Design Cookbook.
CONNECT PIN 3
4. Gain is low by a few percent, along with other screwy
results.
– Probably tried to use output in a floating, differential
manner.
Solution: Tie Pin 6 to a low impedance. See Output
Connections in the Design Cookbook.
GROUND PIN 6
LTC1966
5
VOUT
OUT RTN 6
TYPE 7136
31 HI ADC
30 LO
1966 TS04
2
IN1
LTC1966
NC 3 IN2
1966 TS02
3. Screwy results, particularly with respect to linearity
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.
DC CONNECT ONE INPUT
DC CONNECT ONE INPUT
2
IN1
2
IN1
5. Offsets perceived to be out of specification because 0V
in ≠ 0V out.
– The offsets are not specified at 0V in. No RMS-to‑DC
converter works well at 0 due to a divide-by-zero
calculation.
Solution: Measure VIOS/VOOS by extrapolating
readings > ±5mVDC.
6. Linearity perceived to be out of specification particularly
with small input signals.
– This could again be due to using 0V in as one of the
measurement points.
Solution:CheckLinearityfrom5mVRMSto500mVRMS.
– The input offset voltage can cause small AC
linearity errors at low input amplitudes as well. See
Error Analyses section.
Possible Solution: Include a trim for input offset.
LTC1966
LTC1966
3
IN2
3
IN2
1966 TS03
32
1966fb
Share Link: 