AD636
Model
Min
TEMPERATURE RANGE
Rated Performance
Storage
TRANSISTOR COUNT
AD636J
Typ
Max
Min
AD636K
Typ
Max
Units
°C
°C
0
–55
62
+70
+150
0
–55
62
+70
+150
NOTES
1
Accuracy specified for 0 mV to 200 mV rms, dc or 1 kHz sine wave input. Accuracy is degraded at higher rms signal levels.
2
Measured at Pin 8 of DIP (I
OUT
), with Pin 9 tied to common.
3
Error vs. crest factor is specified as additional error for a 200 mV rms rectangular pulse trim, pulse width = 200
µs.
4
Input voltages are expressed in volts rms.
5
With 10 kΩ pull down resistor from Pin 6 (BUF OUT) to –V
S
.
6
With BUF input tied to Common.
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
quality levels.
ABSOLUTE MAXIMUM RATINGS
1
ORDERING GUIDE
Model
AD636JD
AD636KD
AD636JH
AD636KH
AD636J Chip
AD636JD/+
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
Package
Descriptions
Side Brazed Ceramic DIP
Side Brazed Ceramic DIP
Header
Header
Chip
Side Brazed Ceramic DIP
Package
Options
D-14
D-14
H-10A
H-10A
D-14
Supply Voltage
Dual Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±
16.5 V
Single Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +24 V
Internal Power Dissipation
2
. . . . . . . . . . . . . . . . . . . . 500 mW
Maximum Input Voltage . . . . . . . . . . . . . . . . . . . .
±
12 V Peak
Storage Temperature Range N, R . . . . . . . . . –55°C to +150°C
Operating Temperature Range
AD636J/K . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
Lead Temperature Range (Soldering 60 sec) . . . . . . . . +300°C
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000 V
NOTES
1
Stresses above those listed under Absolute Maximum Ratings may cause perma-
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.
2
10-Lead Header:
θ
JA
= 150°C/Watt.
14-Lead Side Brazed Ceramic DIP:
θ
JA
= 95°C/Watt.
STANDARD CONNECTION
METALIZATION PHOTOGRAPH
Contact factory for latest dimensions.
Dimensions shown in inches and (mm).
0.1315 (3.340)
COM
10
R
L
9
+V
S
14
8 I
OUT
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
AV
, as shown in Figure 5. Thus, if a 4
µF
capacitor
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
µF
ceramic discs as near the device as possible. C
F
is an
optional output ripple filter, as discussed elsewhere in this data
sheet.
C
F
C
AV
– +
(OPTIONAL)
10k
0.0807
(2.050)
V
IN
1
2
V
IN
1a*
1b*
7 BUF IN
6 BUF OUT
ABSOLUTE
VALUE
14
13
12
11
+V
S
AD636
CURRENT
MIRROR
+
BUF
–
V
OUT
10k
AD636
SQUARER
DIVIDER
–V
S
3
–V
S
4
5
C
AV
dB
3
4
5
PAD NUMBERS CORRESPOND TO PIN NUMBERS
FOR THE TO-116 14-PIN CERAMIC DIP PACKAGE.
NOTE
*BOTH PADS SHOWN MUST BE CONNECTED TO V
IN
.
V
OUT
CURRENT
MIRROR
+
BUF
–
10k
10k
+V
S
10
9
8
SQUARER
DIVIDER
ABSOLUTE
VALUE
6
7
V
IN
C
F
(OPTIONAL)
C
AV
+ –
–V
S
Figure 1. Standard RMS Connection
REV. B
–3–
AD [ ANALOG DEVICES ]
