參數(shù)資料
型號(hào)： LTC1968IMS8#TRPBF
廠商： Linear Technology
文件頁(yè)數(shù)： 24/28頁(yè)
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)
24
LTC1968
1968f
APPLICATIO S I FOR ATIO
U
U
U
TROUBLESHOOTING GUIDE
Top Ten LTC1968 Application Mistakes
1.Circuit wont workDead On Arrivalno power drawn.
 Probably forgot to enable the LTC1968 by pulling
Pin8 low.
Solution: Tie Pin 8 to Pin 1.
2.Circuit wont work, but draws power. Zero or very
little output, single-ended input application.
 Probably didnt connect both input pins.
Solution: Tie both inputs to something. See Input
Connections in the Design Cookbook.
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.
LTC1968
CONNECT PIN 3
IN1
2
3
NC
IN2
1968TS02
LTC1968
IN1
2
3
IN2
1968 TS03
DC-COUPLE ONE INPUT
LTC1968
DC-CONNECT ONE INPUT
IN1
2
3
IN2
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.
TYPE 7136
ADC
LTC1968
HI
31
30
5
6
LO
V
OUT
OUT RTN
1968 TS04
GROUND PIN 6
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 V
IOS
/V
OOS
 by extrapolating read-
ings > ?mV
DC
.
6.Linearity perceived to be out of specification particu-
larly with small input signals.
 This could again be due to using 0V in as one of the
measurement points.
Solution: Check Linearity from 5mV
RMS
 to
500mV
RMS
.
 The input offset voltage can cause small AC linear
ityerrors at low input amplitudes as well. See Error
Analyses section.
Possible Solution: Include a trim for input offset.
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