Tru e RMS -t o -DC Co n ve rt e rs
200mV
V
IN
D1
IN4148
C4
2.2µF
R1
+V
S
9M
C3
+V
DD
V+
1
2
3
4
5
6
7
ABSOLUTE
VALUE
0.02µF
14
13
12
11
10
9
D3
D4
D5
2V
R11
26k
1
1N4148
LIN
3 ⁄ DIGIT
2
R6
R9
ADC
MAX130
9V
BATTERY
1M
R2
900k
500k
0dB SET
SQUARER
DIVIDER
REF HI
R12
R5
47k
1W
10%
1k
dB
20V
V-
6.8µF
R14
50k
R10
20k
CURRENT
MIRROR
R3
90k
R13
500Ω
REF LO
COM
LIN
dB
10k
200V
LIN
BUF
SCALE SCALE
1
8
3 ⁄
2
10k
IN HI
dB
R4
10k
DIGIT
LCD
D2
R15
1M
X
C6
0.01µF
R7
20k
C7
6.8µF
IN4148
LIN
DISPLAY
MX636
IN LO
COM
dB
Figure 13. Portable High-Z Input RMS DPM and dB Meter
Typ ic a l Op e ra t in g
________________Circ u it s (c o n t in u e d )
P in Co n fig u ra t io n s (c o n t in u e d )
TOP VIEW
1
2
3
4
5
6
7
8
16
15
V
+V
S
10
IN
9
1
N.C.
-V
N.C.
14 N.C.
S
V
OUT
BUF
CURRENT
MIRROR
8
7
2
13
12
11
10
9
C
AV
MX536A
MX636
N.C.
dB
BUF OUT
BUF IN
N.C.
COMMON
SQUARER
DIVIDER
R
L
+V
S
3
I
OUT
N.C.
ABSOLUTE
VALUE
4
V
IN
6
C
AV
5
SO
-V
S
___________________________________________Ord e rin g In fo rm a t io n (c o n t in u e d )
PART
MX636JQ*
MX636KCWE
MX636KD
MX636KH
MX636KN
MX636KQ*
TEMP. 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
PIN-PACKAGE
14 CERDIP
PART
MX536ASH
MX536ASQ*
MX636JC/D
MX636JCWE
MX636JD
TEMP. RANGE
-55°C to +125°C
-55°C to +125°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
PIN-PACKAGE
10 TO-100
14 CERDIP
Dice**
16 Wide SO
14 Ceramic
10 TO-100
16 Wide SO
14 Ceramic
10 TO-100
14 Plastic DIP
14 Plastic DIP
14 CERDIP
MX636JH
MX636JN
* Maxim reserves the right to ship ceramic packages in lieu of CERDIP packages.
** Dice are specified at T = +25°C.
A
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12 ____________________Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 4 0 8 -7 3 7 -7 6 0 0
© 1998 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.