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AD536 Datasheet

Integrated Circuit True RMS-to-DC Converter

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AD536 pdf
a
Integrated Circuit
True RMS-to-DC Converter
AD536A
FEATURES
True RMS-to-DC Conversion
Laser-Trimmed to High Accuracy
0.2% Max Error (AD536AK)
0.5% Max Error (AD536AJ)
Wide Response Capability:
Computes RMS of AC and DC Signals
450 kHz Bandwidth: V rms > 100 mV
2 MHz Bandwidth: V rms > 1 V
Signal Crest Factor of 7 for 1% Error
dB Output with 60 dB Range
Low Power: 1.2 mA Quiescent Current
Single or Dual Supply Operation
Monolithic Integrated Circuit
–55؇C to +125؇C Operation (AD536AS)
PRODUCT DESCRIPTION
The AD536A is a complete monolithic integrated circuit which
performs true rms-to-dc conversion. It offers performance which
is comparable or superior to that of hybrid or modular units
costing much more. The AD536A directly computes the true
rms value of any complex input waveform containing ac and dc
components. It has a crest factor compensation scheme which
allows measurements with 1% error at crest factors up to 7. The
wide bandwidth of the device extends the measurement capabi-
lity to 300 kHz with 3 dB error for signal levels above 100 mV.
An important feature of the AD536A not previously available in
rms converters is an auxiliary dB output. The logarithm of the
rms output signal is brought out to a separate pin to allow the
dB conversion, with a useful dynamic range of 60 dB. Using an
externally supplied reference current, the 0 dB level can be con-
veniently set by the user to correspond to any input level from
0.1 to 2 volts rms.
The AD536A is laser trimmed at the wafer level for input and
output offset, positive and negative waveform symmetry (dc re-
versal error), and full-scale accuracy at 7 V rms. As a result, no
external trims are required to achieve the rated unit accuracy.
There is full protection for both inputs and outputs. The input
circuitry can take overload voltages well beyond the supply lev-
els. Loss of supply voltage with inputs connected will not cause
unit failure. The output is short-circuit protected.
The AD536A is available in two accuracy grades (J, K) for com-
mercial temperature range (0°C to +70°C) applications, and one
grade (S) rated for the –55°C to +125°C extended range. The
AD536AK offers a maximum total error of ± 2 mV ± 0.2% of
reading, and the AD536AJ and AD536AS have maximum errors
of ± 5 mV ± 0.5% of reading. All three versions are available in
either a hermetically sealed 14-lead DIP or 10-pin TO-100
metal can. The AD536AS is also available in a 20-leadless her-
metically sealed ceramic chip carrier.
REV. B
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
PIN CONFIGURATIONS AND
FUNCTIONAL BLOCK DIAGRAMS
TO-116 (D-14) and
Q-14 Package
TO-100 (H-10A)
Package
VIN 1
ABSOLUTE
VALUE
NC 2 AD536A
VS 3
SQUARER
DIVIDER
CAV 4
14 +VS
13 NC
12 NC
11 NC
IOUT
COM
RL 25k
AD536A
CURRENT
MIRROR
BUF IN
25k
BUF
OUT
BUF
dB 5
BUF
OUT
6
BUF
IN
7
CURRENT
MIRROR
10 COM
BUF
25k
25k9 RL
8 IOUT
+VS
VIN
SQUARER
DIVIDER
ABSOLUTE
VALUE
NC = NO CONNECT
VS
LCC (E-20A) Package
dB
CAV
NC VIN NC +VS NC
3 2 1 20 19
–VS 4
NC 5
CAV 6
NC 7
dB 8
AD536A
ABSOLUTE
VALUE
SQUARER
DIVIDER
25k
CURRENT
MIRROR
BUF
25k
9 10 11 12 13
BUF BUF NC IOUT RL
OUT IN
NC = NO CONNECT
18 NC
17 NC
16 NC
15 NC
14 COM
PRODUCT HIGHLIGHTS
1. The AD536A computes the true root-mean-square level of a
complex ac (or ac plus dc) input signal and gives an equiva-
lent dc output level. The true rms value of a waveform is a
more useful quantity than the average rectified value since it
relates directly to the power of the signal. The rms value of a
statistical signal also relates to its standard deviation.
2. The crest factor of a waveform is the ratio of the peak signal
swing to the rms value. The crest factor compensation
scheme of the AD536A allows measurement of highly com-
plex signals with wide dynamic range.
3. The only external component required to perform measure-
ments to the fully specified accuracy is the capacitor which
sets the averaging period. The value of this capacitor determines
the low frequency ac accuracy, ripple level and settling time.
4. The AD536A will operate equally well from split supplies or
a single supply with total supply levels from 5 to 36 volts.
The one milliampere quiescent supply current makes the
device well-suited for a wide variety of remote controllers and
battery powered instruments.
5. The AD536A directly replaces the AD536 and provides im-
proved bandwidth and temperature drift specifications.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1999


Analog Devices Semiconductor Electronic Components Datasheet

AD536 Datasheet

Integrated Circuit True RMS-to-DC Converter

No Preview Available !

AD536 pdf
AD536A–SPECIFICATIONS (@ +25؇C, and ؎15 V dc unless otherwise noted)
Model
AD536AJ
Min Typ Max
AD536AK
Min Typ Max
AD536AS
Min Typ
Max
Units
TRANSFER FUNCTION
CONVERSION ACCURACY
Total Error, Internal Trim1 (Figure 1)
vs. Temperature, TMIN to +70°C
+70°C to +125°C
vs. Supply Voltage
dc Reversal Error
Total Error, External Trim1 (Figure 2)
ERROR VS. CREST FACTOR2
Crest Factor 1 to 2
Crest Factor = 3
Crest Factor = 7
VOUT =
avg . (VIN )2
؎5 ؎0.5
±0.1 ±0.01
±0.1 ±0.01
± 0.2
±3 ±0.3
VOUT = avg . (VIN )2
؎2 ؎0.2
±0.05 ±0.005
±0.1 ±0.01
± 0.1
±2 ±0.1
Specified Accuracy
0.1
1.0
Specified Accuracy
0.1
1.0
VOUT = avg . (VIN )2
؎5 ؎0.5
؎0.1 ؎0.005
؎0.3 ؎0.005
±0.1 ±0.01
± 0.2
±3 ±0.3
mV ± % of Reading
mV ± % of Reading/°C
mV ± % of Reading/°C
mV ± % of Reading/V
± % of Reading
mV ± % of Reading
Specified Accuracy
0.1
1.0
% of Reading
% of Reading
FREQUENCY RESPONSE3
Bandwidth for 1% Additional Error (0.09 dB)
VIN = 10 mV
VIN = 100 mV
VIN = 1 V
±3 dB Bandwidth
5 5 5 kHz
45 45 45 kHz
120 120 120 kHz
VIN = 10 mV
VIN = 100 mV
VIN = 1 V
90 90 90 kHz
450 450 450 kHz
2.3 2.3 2.3 MHz
AVERAGlNG TlME CONSTANT (Figure 5)
25
25
25 ms/µF CAV
INPUT CHARACTERISTICS
Signal Range, ± 15 V Supplies
Continuous rms Level
Peak Transient Input
Continuous rms Level, ± 5 V Supplies
Peak Transient Input, ±5 V Supplies
Maximum Continuous Nondestructive
Input Level (All Supply Voltages)
Input Resistance
Input Offset Voltage
13.33
0 to 7
0 to 2
16.67
0.8
± 20
±7
± 25
20
±2
13.33
0 to 7
0 to 2
16.67
0.5
± 20
±7
± 25
20
±1
0 to 7
0 to 2
13.33
16.67
0.8
± 20
±7
± 25
20
±2
V rms
V peak
V rms
V peak
V peak
k
mV
OUTPUT CHARACTERISTICS
Offset Voltage, VIN = COM (Figure 1)
vs. Temperature
vs. Supply Voltage
Voltage Swing, ± 15 V Supplies
±5 V Supply
0 to +11
0 to +2
±1
± 0.1
± 0.1
+12.5
±2
0 to +11
0 to +2
± 0.5
± 0.1
± 0.1
+12.5
±1
± 0.2
0 to +11 +12.5
0 to +2
؎2
؎0.2
mV
mV/°C
mV/V
V
V
dB OUTPUT (Figure 13)
Error, VlN 7 mV to 7 V rms, 0 dB = 1 V rms
Scale Factor
Scale Factor TC (Uncompensated, see Fig-
ure 1 for Temperature Compensation)
IREF for 0 dB = 1 V rms
IREF Range
IOUT TERMINAL
IOUT Scale Factor
IOUT Scale Factor Tolerance
Output Resistance
Voltage Compliance
5
1
20
± 0.4
3
0.033
+0.33
20
؎0.6
80
100
40
± 10
25
VS to (+VS
2.5 V)
± 20
30
5
1
20
± 0.2
3
0.033
+0.33
20
؎0.3
80
100
40
± 10
25
VS to (+VS
2.5 V)
± 20
30
± 0.5
3
؎0.6
0.033
+0.33
5 20
80
1 100
40
±10 ±20
20 25
30
VS to (+VS
2.5 V)
dB
mV/dB
dB/°C
% of Reading/°C
µA
µA
µA/V rms
%
k
V
BUFFER AMPLIFIER
Input and Output Voltage Range
Input Offset Voltage, RS = 25 k
Input Bias Current
Input Resistance
Output Current
Short Circuit Current
Output Resistance
Small Signal Bandwidth
Slew Rate4
VS to (+VS
2.5 V)
(+5 mA,
130 µA)
± 0.5
20
108
20
1
5
؎4
60
0.5
VS to (+VS
2.5 V)
(+5 mA,
130 µA)
± 0.5
20
108
20
1
5
؎4
60
0.5
VS to (+VS
2.5 V)
± 0.5
20
108
(+5 mA,
130 µA)
20
1
5
؎4
60
0.5
V
mV
nA
mA
MHz
V/µs
POWER SUPPLY
Voltage Rated Performance
Dual Supply
Single Supply
Quiescent Current
Total VS, 5 V to 36 V, TMIN to TMAX
TEMPERATURE RANGE
Rated Performance
Storage
± 3.0
+5
0
55
± 15
1.2
± 18
+36
2
+70
+150
± 3.0
+5
0
55
± 15
1.2
± 18
+36
2
+70
+150
± 3.0
+5
55
55
± 15
1.2
± 18
+36
2
+125
+150
V
V
V
mA
°C
°C
NUMBER OF TRANSISTORS
65
65
65
NOTES
1Accuracy is specified for 0 V to 7 V rms, dc or 1 kHz sine wave input with the AD536A connected as in the figure referenced.
2Error vs. crest factor is specified as an additional error for 1 V rms rectangular pulse input, pulsewidth = 200 µs.
3Input voltages are expressed in volts rms, and error is percent of reading.
4With 2k external pull-down resistor.
Specifications subject to change without notice.
Specifications shown in boldface are tested on all production units at final electrical test. Results from those tests are used to calculate outgoing quality levels. All min and max specifications are guaranteed,
although only those shown in boldface are tested on all production units.
–2– REV. B


Part Number AD536
Description Integrated Circuit True RMS-to-DC Converter
Maker Analog Devices
Total Page 8 Pages
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