RMS-to-DC Converter. LTC1967 Datasheet

LTC1967 Converter. Datasheet pdf. Equivalent

Part LTC1967
Description RMS-to-DC Converter
Feature U U LTC1967 FEATURES Precision Extended Bandwidth, RMS-to-DC Converter DESCRIPTIO s High Lineari.
Manufacture Linear
Datasheet
Download LTC1967 Datasheet



LTC1967
LTC1967
FEATURES
Precision Extended
Bandwidth, RMS-to-DC Converter
DESCRIPTIO
s High Linearity:
0.02% Linearity Allows Simple System Calibration
s Wide Input Bandwidth:
Bandwidth to 0.1% Additional Gain Error: 40kHz
Bandwidth Independent of Input Voltage Amplitude
s No-Hassle Simplicity:
True RMS-DC Conversion with Only One External
Capacitor
Delta Sigma Conversion Technology
s Low Supply Current:
330µA Typ
s Ultralow Shutdown Current:
0.1µA
s Flexible Inputs:
Differential or Single Ended
Rail-to-Rail Common Mode Voltage Range
Up to 1VPEAK Differential Voltage
s Flexible Output:
Rail-to-Rail Output
Separate Output Reference Pin Allows Level Shifting
s Small Size:
Space Saving 8-Pin MSOP Package
U
APPLICATIO S
The LTC®1967 is a true RMS-to-DC converter that uses an
innovative delta-sigma computational technique. The ben-
efits of the LTC1967 proprietary architecture when com-
pared to conventional log-antilog RMS-to-DC converters
are higher linearity and accuracy, bandwidth independent
of amplitude and improved temperature behavior.
The LTC1967 operates with single-ended or differential in-
put signals (for EMI/RFI rejection) and supports crest fac-
tors up to 4. Common mode input range is rail-to-rail. Dif-
ferential input range is 1VPEAK, and offers unprecedented
linearity. The LTC1967 allows hassle-free system calibra-
tion at any input voltage.
The LTC1967 has a rail-to-rail output with a separate out-
put reference pin providing flexible level shifting; it oper-
ates on a single power supply from 4.5V to 5.5V. A low power
shutdown mode reduces supply current to 0.1µA.
The LTC1967 is packaged in the space-saving MSOP pack-
age, which is ideal for portable applications.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Protected under U.S. Patent Numbers 6,359,576, 6,362,677 and 6,516,291
s True RMS Digital Multimeters and Panel Meters
s True RMS AC + DC Measurements
TYPICAL APPLICATIO
Single Supply RMS-to-DC Converter
4.5V TO 5.5V
DIFFERENTIAL
INPUT
0.1µF
OPT. AC
COUPLING
V+
IN1 OUTPUT
LTC1967
IN2 OUT RTN
EN GND
1967 TA01
CAVE
1µF
+
VOUT
Linearity Performance
0.2
LTC1967, Σ
0
–0.2
–0.4
–0.6 CONVENTIONAL
LOG/ANTILOG
–0.8
60Hz SINEWAVE
–1.0
0 100 200
300
VIN (mV ACRMS)
400 500
1967 TA01b
1967f
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LTC1967
LTC1967
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage
V+ to GND ............................................................. 6V
Input Currents (Note 2) ..................................... ±10mA
Output Current (Note 3) ..................................... ±10mA
ENABLE Voltage ......................................... –0.3V to 6V
OUT RTN Voltage ........................................ –0.3V to V+
Operating Temperature Range (Note 4)
LTC1967C/LTC1967I ......................... – 40°C to 85°C
Specified Temperature Range (Note 5)
LTC1967C/LTC1967I ......................... – 40°C to 85°C
Maximum Junction Temperature ......................... 150°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
GND 1
IN1 2
IN2 3
NC 4
8 ENABLE
7 V+
6 OUT RTN
5 VOUT
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 220°C/ W
ORDER PART
NUMBER
LTC1967CMS8
LTC1967IMS8
MS8 PART MARKING
LTTJ
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are TA = 25°C. V+ = 5V, VOUTRTN = 2.5V, CAVE = 10µF, VIN = 200mVRMS, VENABLE = 0.5V
unless otherwise noted.
SYMBOL
PARAMETER
Conversion Accuracy
GERR Low Frequency Gain Error
VOOS
VOOS/T
LINERR
PSRRG
Output Offset Voltage
Output Offset Drift
Linearity Error
Power Supply Rejection
VIOS Input Offset Voltage
VIOS/T
Input Offset Drift
Additional Error vs Crest Factor (CF)
CF = 3
CF = 5
Input Characteristics
VIMAX
IVR
ZIN
Maximum Peak Input Swing
Input Voltage Range
Input Impedance
CMRRI
VIMIN
PSRRI
Input Common Mode Rejection
Minimum RMS Input
Power Supply Rejection
CONDITIONS
50Hz to 5kHz Input (Notes 6, 7)
(Notes 6, 7)
(Note 11)
50mV to 350mV (Notes 7, 8)
(Note 9)
(Notes 6, 7, 10)
(Note 11)
60Hz Fundamental, 200mVRMS
60Hz Fundamental, 200mVRMS
Accuracy = 1% (Note 14)
Average, Differential (Note 12)
Average, Common Mode (Note 12)
(Note 13)
(Note 9)
MIN TYP MAX
±0.1 ±0.3
q ±0.4
0.1 0.55
q 2 10
q 0.02 0.15
0.02 0.15
q 0.20
0.2 1.5
q 1 10
q 0.2
q5
q1
q0
q
q
q
1.05
V+
5
100
50 400
5
250 600
UNITS
%
%
mV
µV/°C
%
%/V
%/V
mV
µV/°C
mV
mV
V
V
M
M
µV/V
mV
µV/V
1967f
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