AD636 AD [Analog Devices], AD636 Datasheet - Page 3

• Manufacturer Part Number: AD636
• Description: Low Level, True RMS-to-DC Converter
• Manufacturer: AD [Analog Devices]

M odel
TEMPERATURE RANGE
TRANSISTOR COUNT
NOTES
1
2
3
4
5
6
Specifications subject to change without notice.
All min and max specifications are guaranteed. Specifications shown in boldface are tested on all production units at final electrical test and are used to calculate outgoing
REV. B
ABSOLUTE MAXIMUM RATINGS
Supply Voltage
Internal Power Dissipation
Maximum Input Voltage . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range N, R . . . . . . . . . –55 C to +150 C
Operating Temperature Range
Lead Temperature Range (Soldering 60 sec) . . . . . . . . +300 C
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000 V
NOTES
1
2
Accuracy specified for 0 mV to 200 mV rms, dc or 1 kHz sine wave input. Accuracy is degraded at higher rms signal levels.
Measured at Pin 8 of DIP (I
Error vs. crest factor is specified as additional error for a 200 mV rms rectangular pulse trim, pulse width = 200 s.
Input voltages are expressed in volts rms.
With 10 k pull down resistor from Pin 6 (BUF OUT) to –V
With BUF input tied to Common.
quality levels.
Stresses above those listed under Absolute Maximum Ratings may cause perma-
10-Lead Header:
14-Lead Side Brazed Ceramic DIP:
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
0.0807
(2.050)
Rated Performance
Storage
Dual Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.5 V
Single Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +24 V
AD636J/K . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 C to +70 C
V
+V
IN
S
1a*
1b*
14
NOTE
*BOTH PADS SHOWN MUST BE CONNECTED TO V
PAD NUMBERS CORRESPOND TO PIN NUMBERS
FOR THE TO-116 14-PIN CERAMIC DIP PACKAGE.
METALIZATION PHOTOGRAPH
JA
Dimensions shown in inches and (mm).
Contact factory for latest dimensions.
= 150 C/Watt.
OUT
), with Pin 9 tied to common.
0.1315 (3.340)
2
–V
3
. . . . . . . . . . . . . . . . . . . . 500 mW
JA
S
= 95 C/Watt.
C
4
AV
1
COM
10
dB
5
Min
0
–55
R
S
9
.
L
IN
AD636J
.
Typ
62
8 I
7 BUF IN
6 BUF OUT
12 V Peak
OUT
Max
+70
+150
–3–
Model
AD636JD
AD636KD
AD636JH
AD636KH
AD636J Chip
AD636JD/+
STANDARD CONNECTION
The AD636 is simple to connect for the majority of high accu-
racy rms measurements, requiring only an external capacitor to
set the averaging time constant. The standard connection is
shown in Figure 1. In this configuration, the AD636 will mea-
sure the rms of the ac and dc level present at the input, but will
show an error for low frequency inputs as a function of the filter
capacitor, C
is used, the additional average error at 10 Hz will be 0.1%, at
3 Hz it will be 1%. The accuracy at higher frequencies will be
according to specification. If it is desired to reject the dc input, a
capacitor is added in series with the input, as shown in Fig-
ure 3; the capacitor must be nonpolar. If the AD636 is driven
with power supplies with a considerable amount of high frequency
ripple, it is advisable to bypass both supplies to ground with
0.1 F ceramic discs as near the device as possible. C
optional output ripple filter, as discussed elsewhere in this data
sheet.
V
–V
OUT
V
IN
S
Min
0
–55
1
4
6
2
3
5
7
AD636
BUF
+
–
AV
Figure 1. Standard RMS Connection
ABSOLUTE
10k
AD636K
SQUARER
CURRENT
DIVIDER
MIRROR
, as shown in Figure 5. Thus, if a 4 F capacitor
VALUE
–
C
Temperature
Range
0 C to +70 C
0 C to +70 C
0 C to +70 C
0 C to +70 C
0 C to +70 C
0 C to +70 C
62
AV
Typ
+
10k
ORDERING GUIDE
14
13
12
10
11
9
8
(OPTIONAL)
C
+V
F
Max
+70
+150
+V
S
Descriptions
Side Brazed Ceramic DIP D-14
Side Brazed Ceramic DIP D-14
Header
Header
Chip
Side Brazed Ceramic DIP D-14
Package
S
(OPTIONAL)
V
IN
C
F
+
AD636
C
AV
–
Units
C
C
10k
ABSOLUTE
SQUARER
CURRENT
MIRROR
DIVIDER
VALUE
–V
S
F
+
AD636
BUF
is an
–
Package
Options
H-10A
H-10A
10k
V
OUT