Data Sheet
AD636
Rev. E | Page 13 of 16
Frequency Response ? dBm
Input
0 dBm = 5 Hz to 380 kHz
10 dBm = 5 Hz to 370 kHz
20 dBm = 5 Hz to 240 kHz
30 dBm = 5 Hz to 100 kHz
40 dBm = 5 Hz to 45 kHz
50 dBm = 5 Hz to 17 kHz
Calibration
First, calibrate the 0 dB reference level by applying a 1 kHz sine
wave from an audio oscillator at the desired 0 dB amplitude.
This can be anywhere from 0 dBm (770 mV rms 2.2 V p-p)
to 20 dBm (77 mV rms 220 mV p-p). Adjust the IREF
calibration trimmer for a zero indication on the analog meter.
Then, calibrate the meter scale factor or gain. Apply an input
signal 40 dB below the set 0 dB reference and adjust the scale
factor calibration trimmer for a 40 糀 reading on the analog meter.
The temperature compensation resistors for this circuit can be
purchased from Micro-Ohm Corporation, 1088 Hamilton Rd.,
Duarte, CA 91010, Part #Type 401F, 2 k?,1% + 3500 ppm/癈.
R2
900k&
1
2
3
4
5
6
7
AD636
14
13
12
11
10
9
8
BUF
+
+
+
+
+V
DD
REF HI
REF LO
COM
HI
LO
+
+
ON
OFF
LXD 7543
LIN
dB
LIN
dB
LIN
dB
200mV
2V
20V
200V
COM
IN
R1
9M&
R3
90k&
R4
10k&
C3
0.02礔
R5
47k&
1W
10%
D1
1N4148
C4
2.2礔
R6
1M&
ABSOLUTE
VALUE
SQUARER
DIVIDER
CURRENT
MIRROR
6.8礔
R7
20k&
D4
1N4148
10k&
10k&
C7
6.8礔
D2
1N4148
R8
2.49k&
+V
S
R9
100k&
0dB SET
R10
20k&
D3
1.2V
AD589
LIN
SCALE
R15
1M&
C6
0.01礔
V
S
V
SS
ANALOG
IN
3-1/2 DIGIT
7106 TYPE
A/D
CONVERTER
+V
DD
V
SS
9V
BATTERY
1礔
R11
10k&
R12
1k&
R13
500&
R14
10k&
dB
SCALE
3-1/2
DIGIT
LCD
DISPLAY
V
IN
NC
V
S
C
AV
dB
BUF OUT
BUF IN
+V
S
NC
NC
NC
COM
R
L
I
OUT
NC = NO CONNECT
Figure 17. Portable, High-Z Input, RMS DPM and dB Meter Circuit
ALL RESISTORS 1/4W 1% METAL FILM UNLESS OTHERWISE STATED EXCEPT
*WHI HI 2k&+ m1 T RE I T R.
1
2
3
4
5
6
7
AD636
14
13
12
11
10
9
8
BUF
+
+
+
礎776
+
+
+
+
+
ON/OFF
9V
+1.2V
AD589J
250礎
100礎
+
+4.2V
4.8V
D1
1N6263
IGNAL
INPUT
C4
0.1礔
R8
47k&
1W
D2
1N6263
C1
3.3礔
R1
1M&
C2
6.8礔
10k&
10k&
R9
10k&
ABSOLUTE
VALUE
SQUARER
DIVIDER
CURRENT
MIRROR
R2
12.7k&
C3
10礔
C5
10礔
R10
20k&
C6
0.1礔
*R7
2k&
R6
100&
R3
5k&
R4
500k&
I
REF
ADJUST
R11
820k&
5%
050礎
R5
10k&
SCALEFACTOR
ADJUST
2
3
4
8
7
6
NC = NO CONNECT
V
IN
NC
V
S
C
AV
dB
BUF OUT
BUF IN
+V
S
NC
NC
NC
COM
R
L
I
OUT
Figure 18. Low Power, High Input Impedance dB Meter
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