AD637JQ Analog Devices Inc, AD637JQ Datasheet - Page 11

• Manufacturer Part Number: AD637JQ
• Description: IC RMS/DC CONV PRECISION 14-CDIP
• Manufacturer: Analog Devices Inc

Specifications of AD637JQ

• 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)
• Accuracy %: 0.25%
• Bandwidth: 200kHz
• Supply Current: 2.2mA
• Power Dissipation Pd: 108mW
• Supply Voltage Range: ± 3V To ± 18V
• Digital Ic Case Style: DIP
• No. Of Pins: 14
• Input Type: RMS
• Module Type: Converter
• Output Type: DC
• Voltage, Supply: ± 18 VDC
• For Use With: AD637-EVALZ - BOARD EVALUATION FOR AD637
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

AD637
OUTPUT
OFFSET
ADJUST
NC = NO CONNECT
50kΩ
0dB ADJUST
SIGNAL
10k Ω
500k Ω
INPUT
+V
R1
+V
–V
S
S
S
4.7kΩ
1MΩ
+2.5 VOLTS
1
2
4
5
3
6
7
+V
4.7kΩ
BUF IN
NC
COM
OUT
OFF
CS
DEN
IN
dB
S
NOTE: VALUES CHOSEN TO GIVE 0.1%
1
2
3
4
5
6
7
25k Ω
BUF IN
NC
COM
OUT
OFF
CS
DEN
IN
dB
SECTION
AVERAGING ERROR @ 1Hz
BIAS
+V
25kΩ
BUFFER
S
SECTION
BIAS
AD508J
BUFFER
Figure 20. AD637 as a Low Frequency RMS Converter
SQUARER/DIVIDER
C
3.3µ F
AV1
SQUARER/DIVIDER
ABSOLUTE
AD637
VALUE
499kΩ 1%
AD637
FILTER
Figure 19. dB Connection
ABSOLUTE
R
25k Ω
Rev. G | Page 14 of 20
VALUE
FILTER
25kΩ
BUFFER
BUFFER
OUT
C
+V
–V
V
NC
AV
IN
OUT
S
S
C
+V
–V
V
NC
AV
IN
S
S
14
13
12
11
10
9
8
+
14
13
11
10
9
8
12
+
V
+V
–V
3.3MΩ
OUT
V
1 µ F
100µ F
+V
–V
OUT
S
S
*1k Ω
S
S
SIGNAL
INPUT
3.3M Ω
60.4 Ω
1µ F
R3
*1k Ω + 3500ppm
NC = NO CONNECT
V
TC RESISTOR TEL LAB Q81
PRECISION RESISTOR PT146
OR EQUIVALENT
V rms
1µF
IN
2
33.2k Ω
6.8MΩ
AD548JN
AD707JN
1000pF
+V
–V
+V
–V
R2
S
S
5k Ω
S
S
COMPENSATED
dB OUTPUT
+ 100mV/dB
dB SCALE
FACTOR
ADJUST
V RMS OUTPUT
FILTERED