ad2033 Analog Devices, Inc., ad2033 Datasheet - Page 3

• Manufacturer Part Number: ad2033
• Description: Truerms /db M.ultirange,~meter.
• Manufacturer: Analog Devices, Inc.

The digital processor contains control, counting, storage and
For True rIDSreadout, the above is used as the AID input.
It also drives the log ratio circuitry which develops a dB
output relative to either internal or external referenc~ voltage-
For dO readout, the log ratio output feeds the AID input.
The AID conversion is performed via a special technique
analog and digital processing. The analog processor provides
buffering, integration,
diagram, the two processors are opto and pulse transformer
isolated. This isolation increases DPM tolerance to front end
noise and high common mode voltage. The output of the
digital processor drives the display via a seven segment
decoder driver and is also available via the parallel BCD data
APPLYING THE AD20H
("Charge Balancing") that requires interaction
data multiplexing
storage.
True rms Measurements
A typical setup for measuring 1.999V rIDSFS (Range B)
can be accomplished
(Pin A) to Feedback (Pin F). Connect 1. 999V source between
Description Of Operation
ranges except Range B. The output of the buffer amplifier
drives a True rIDSto dc converter that combines loga-
Input (Pin K) and Ground (Pins 1-6). Then connect rIDs/dc
fashion in setting up for all other ranges except when using
The timing and block diagrams are shown in Figures 1 and 2
rithmic and implicit computing
overall error and a wide dynamic range, as in the equation:
respectively. The input pin for all ranges except range A is
Pin K. Range A input connects to Pin E. The input signal
is fed into a buffer amplifier. Range selection is made by
connecting
Current Compensate
over extended
CONVERSION CYCLE
DATA
DATA VALID
Temperature
Frequency
RanJC
Accuracy
(Sinewave Input)
13kHz Sinewave
Zero
Gain
DC or 30Hz to
:tl% RDG :1:0.05% I'S
the appropriate feedback
READY
3dB (max error)
v
Figure 1.
rIDS
:1:1digit (max error)
temperatures,
Response:
functions. As can be seen from the block
\ =
Coefficient:
I
!-133m.-1--67ms--1
by linking Feedback Range Select
j
(Pin B), for stabilization
autozeroing
AD2033
T
1
, .
Jo
~-
roT (V
~
u
should be tied to ground on all
I
techniques to achieve low
Timing Diagram
IN
:l:20jJ.V/C
:t75ppm/oC
2m. ( APPROX.)
and comparison
:1:1.2% RDG
:1:0.05% FS
:1:1digit
30Hz to 10kHz
30Hz to 100kHz
199.9mV rIDS
)2 dt
resistor. The Bias
r
Table 1. AD2033 rms Specifications
of bias current
between
1'1-.
1r-
functions.
:1:0.1% RDG
:l:60jJ.V/C
:t75ppm/C
30Hz to 100kHz
:1:0.05% FS
:1:1digit
30Hz to 10kHz
1.999V rIDS
117) dB REFERENCE
(~IINPUT RANGES B,C,D.E
IU) dB REFERENCE
0 INPUT RANGE
IDICONV
sate (Pin B) must be connected to Ground on all ranges
the 199. 9m V rms FS range where Pin K must be grounded
and the input must go to Pin E. The Bias Current Compen-
except the 1.999V rIDSFS.
ANALOG
.:1:0.05% FS
:1:0.3% RDG
:to.6m V / C
:t75ppm/C
30Hz to 10kHz
30Hz to 100kHz
HOLD
:1:1digit
19.99V rIDS
IAI
GRD.
'-~
J 0
l
ICI FEEDBACK
{DIFEEDBACK
12 RANGES MB
0
EI
~..n"
I
IPINS
FEEDBACK RANGE SELECT
IN
OUT
FEEDBACK '
RANGE C
A
RANGE E
RANGE D
FEEDBACK I
Figure
1-61
,'m «'"0
I-
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liS
1\;
I~
I~
,"
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L
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r
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2.
Applyingthe AD2033
1k
101<
1M
UPDATE
POLARITY
.
AD2033
:1:0.05% FS
:1:1digit
:1:0.3% RDG
:t6mV/C
:t75ppm/C
30Hz to 10kHz
30Hz to 100kHz 30Hz to 30kHz
199.9V rIDS
VREF
CONTROL
Block Diagram
MULTIPLEXED
_1~l~T~ !!'~!.~~
:t60mV/C
:t75ppm/oC
:1:1.2% RDG
30Hz to 5kHz
600V rms
:1:0.05% FS
:1:1digit
DISPLAY
BCD
IMUl TIPLEXEDI
EXT.
DATA
VSOG
CAP IDPTIONAl}
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DATA HOLD
,
STATUS
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i5i'1XXX
'ms-DC oUT
dB OUTPUT
AID INPUT
-,-
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1'31
111
131
(IB)
1M)
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