AD637JD/+ Analog Devices Inc, AD637JD/+ Datasheet - Page 13

• Manufacturer Part Number: AD637JD/+
• Description: IC RMS/DC CONV PRECISION 14-CDIP
• Manufacturer: Analog Devices Inc

Specifications of AD637JD/+

• Rohs Status: RoHS non-compliant
• Current - Supply: 2.2mA
• Voltage - Supply: ±3.0V ~ 18V
• Mounting Type: Through Hole
• Package / Case: 14-CDIP (0.300", 7.62mm)

dB CALIBRATION
Refer to Figure 20:
• Set V
• Adjust R1 for 0 dB out = 0.00 V
• Set V
• Adjust R2 for dB out = −2.00 V
Any other dB reference can be used by setting V
accordingly.
IN
IN
= 1.00 V dc or 1.00 V rms
= 0.1 V dc or 0.10 V rms
*1kΩ + 3500ppm
0dB ADJUST
SEE TEXT
SIGNAL
10kΩ
500kΩ
+V
INPUT
R1
S
4.7kΩ
+2.5 V
1
2
4
5
3
6
7
OUTPUT
OFFSET
BUFF IN
NC
COMMON
CS
DEN
INPUT
dB OUTPUT
25kΩ
SECTION
+V
BIAS
BUFFER
S
IN
AD508J
and R1
SQUARER/DIVIDER
ABSOLUTE
AD637
VALUE
Figure 20. dB Connection
FILTER
Rev. K | Page 13 of 20
25kΩ
NC = NO CONNECT
BUFF
OUT
C
+V
–V
V
NC
AV
IN
S
S
14
13
12
11
10
9
8
+
V
+V
–V
OUT
1µF
S
S
1kΩ*
R3
60.4Ω
33.2kΩ
2
3
AD707JN
+V
–V
R2
4
7
5kΩ
S
S
COMPENSATED
dB OUTPUT
+ 100mV/dB
6
dB SCALE
FACTOR
ADJUST
AD637