RMS-to-DC Converter. LTC1966 Datasheet

LTC1966 Converter. Datasheet pdf. Equivalent

Part LTC1966
Description SIGMA RMS-to-DC Converter
Feature LTC1966 Precision Micropower ∆∑ RMS-to-DC Converter Features n Simple to Use, Requires One Capacit.
Manufacture Linear Technology
Datasheet
Download LTC1966 Datasheet

LTC1966 Precision Micropower ∆∑ RMS-to-DC Converter Feature LTC1966 Datasheet
Recommendation Recommendation Datasheet LTC1966 Datasheet




LTC1966
LTC1966
Precision Micropower
∆∑ RMS-to-DC Converter
Features
n Simple to Use, Requires One Capacitor
n True RMS DC Conversion Using ∆Σ Technology
n High Accuracy:
0.1% Gain Accuracy from 50Hz to 1kHz
0.25% Total Error from 50Hz to 1kHz
n High Linearity:
0.02% Linearity Allows Simple System Calibration
n Low Supply Current:
155µA Typ, 170µA Max
n Ultralow Shutdown Current:
0.1µA
n Constant Bandwidth:
Independent of Input Voltage
800kHz –3dB, 6kHz ±1%
n Flexible Supplies:
2.7V to 5.5V Single Supply
Up to ±5.5V Dual Supply
n Flexible Inputs:
Differential or Single-Ended
Rail-to-Rail Common Mode Voltage Range
Up to 1VPEAK Differential Voltage
n Flexible Output:
Rail-to-Rail Output
Separate Output Reference Pin Allows Level Shifting
n Wide Temperature Range:
–55°C to 125°C
n Small Size:
Space Saving 8-Pin MSOP Package
Typical Application
Single Supply RMS-to-DC Converter
2.7V TO 5.5V
DIFFERENTIAL
INPUT
0.1µF
OPT. AC
COUPLING
VDD
IN1 OUTPUT
LTC1966
IN2 OUT RTN
EN VSS GND
CAVE
1µF
+– VOUT
1966 TA01
Description
The LTC®1966 is a true RMS-to-DC converter that utilizes
an innovative patented ∆Σ computational technique. The
internal delta sigma circuitry of the LTC1966 makes it sim-
pler to use, more accurate, lower power and dramatically
more flexible than conventional log antilog RMS-to-DC
converters.
The LTC1966 accepts single-ended or differential input
signals (for EMI/RFI rejection) and supports crest factors up
to 4. Common mode input range is rail-to-rail. Differential
input range is 1VPEAK, and offers unprecedented linearity.
Unlike previously available RMS-to-DC converters, the
superior linearity of the LTC1966 allows hassle free system
calibration at any input voltage.
The LTC1966 also has a rail-to-rail output with a separate
output reference pin providing flexible level shifting. The
LTC1966 operates on a single power supply from 2.7V to
5.5V or dual supplies up to ±5.5V. A low power shutdown
mode reduces supply current to 0.5µA.
The LTC1966 is insensitive to PC board soldering and
stresses, as well as operating temperature. The LTC1966
is packaged in the space saving MSOP package which is
ideal for portable applications.
Applications
n True RMS Digital Multimeters and Panel Meters
n True RMS AC + DC Measurements
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
No Latency DS is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents including 6359576, 6362677,
6516291 and 6651036.
Quantum Leap in Linearity Performance
0.2
0 LTC1966, ∆∑
–0.2
–0.4
–0.6 CONVENTIONAL
LOG/ANTILOG
–0.8
60Hz SINEWAVES
–1.0
0 50 100 150 200 250 300 350 400 450 500
VIN (mV ACRMS)
1966 TA01b
1966fb
1



LTC1966
LTC1966
Absolute Maximum Ratings
(Note 1)
Supply Voltage
VDD to GND.............................................. – 0.3V to 7V
VDD to VSS ............................................. –0.3V to 12V
VSS to GND.............................................. –7V to 0.3V
Input Currents (Note 2)....................................... ±10mA
Output Current (Note 3)...................................... ± 10mA
ENABLE Voltage........................ VSS – 0.3V to VSS + 12V
OUT RTN Voltage................................ VSS – 0.3V to VDD
Operating Temperature Range (Note 4)
LTC1966C/LTC1966I.............................–40°C to 85°C
LTC1966H........................................... –40°C to 125°C
LTC1966MP........................................ –55°C to 125°C
Specified Temperature Range (Note 5)
LTC1966C/LTC1966I.............................–40°C to 85°C
LTC1966H........................................... –40°C to 125°C
LTC1966MP........................................ –55°C to 125°C
Maximum Junction Temperature.......................... 150°C
Storage Temperature Range.................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
Pin Configuration
TOP VIEW
GND 1
IN1 2
IN2 3
VSS 4
8 ENABLE
7 VDD
6 OUT RTN
5 VOUT
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 220°C/W
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC1966CMS8#PBF
LTC1966CMS8#TRPBF LTTG
8-Lead Plastic MSOP
0°C to 70°C
LTC1966IMS8#PBF
LTC1966IMS8#TRPBF LTTH
8-Lead Plastic MSOP
–40°C to 85°C
LTC1966HMS8#PBF
LTC1966HMS8#TRPBF LTTG
8-Lead Plastic MSOP
–40°C to 125°C
LTC1966MPMS8#PBF
LTC1966MPMS8#TRPBF LTTG
8-Lead Plastic MSOP
–55°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
E lectrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications
VENABLE = 0.5V unless otherwise noted.
are
at
TA
=
25°C.
VDD
=
5V,
VSS
=
5V,
VOUTRTN
=
0V,
CAVE
=
10µF,
VIN
=
200mVRMS,
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Conversion Accuracy
GERR Conversion Gain Error
50Hz to 1kHz Input (Notes 6, 7)
LTC1966C, LTC1966I
LTC1966H, LTC1966MP
±0.1 ±0.3
%
l ±0.4 %
l ±0.7 %
VOOS Output Offset Voltage
(Notes 6, 7)
LTC1966C, LTC1966I
LTC1966H, LTC1966MP
0.1 0.2
mV
l 0.4 mV
l 0.6 mV
LINERR Linearity Error
50mV to 350mV (Notes 7, 8)
l
0.02 0.15
%
1966fb
2





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