AD636

REV. B

–8–

1

2

3

4

5

6

7

AD636

14

13

12

11

10

9

8

ABSOLUTE

VALUE

SQUARER

DIVIDER

BUF

10k

10k

CURRENT

MIRROR

+

–

+

–

+

3-1/2

DIGIT

LCD

DISPLAY

3-1/2 DIGIT

7106 TYPE

A/D

CONVERTER

REF HI

REF LO

COM

HI

LO

ANALOG

IN

+

–

+

ON

OFF

1 F

9V

BATTERY

LXD 7543

C6

0.01 F

R15

1M

LIN

dB

LIN

dB

LIN

SCALE

R13

500

R12

1k

R11

10k

D2

1N4148

LIN

dB

R14

10k

dB

SCALE

D3

1.2V

AD589

R10

20k

R9

100k

0dB SET

R8

2.49k

C7

6.8 F

C4

2.2 F

D1

1N4148

R6

1M

R5

47k

1W

10%

C3

0.02 F

200mV

R1

9M

2V

R2

900k

20V

R3

90k

200V

R4

10k

COM

6.8 F

R7

20k

D4

1N4148

Figure 14. A Portable, High Z Input, RMS DPM and dB Meter Circuit

1

2

3

4

5

6

7

AD636

14

13

12

11

10

9

8

ABSOLUTE

VALUE

SQUARER

DIVIDER

BUF

+

–

10k

10k

CURRENT

MIRROR

+–

+

–

A776

+–

+

+

+

+

ON/OFF

9 VOLT

SCALE FACTOR

ADJUST

R5

10k

0–50 A

R11

820k

5%

100 A

R4

500k

ADJUST

R3

5k

+1.2 VOLTS

AD589J

250 A

+

R6

100

*R7

2k

C6

0.1 F

+4.4 VOLTS

R2

12.7k

C3

10 F

C5

10 F

R10

20k

+4.7 VOLTS

C1

3.3 F

C2

6.8 F

R1

1M

D1

1N6263

SIGNAL

INPUT

C4

0.1 F

R8

47k

1 WATT

D2

1N6263

R9

10k

ALL RESISTORS 1/4 WATT 1% METAL FILM UNLESS OTHERWISE STATED EXCEPT

*WHICH IS 2k

+3500ppm 1% TC RESISTOR.

Figure 15. A Low Power, High Input Impedance dB Meter

OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).

D Package (TO-116)

H Package (TO-100)

14

1

7

8

0.098 (2.49) MAX

0.310 (7.87)

0.220 (5.59)

0.005 (0.13) MIN

PIN 1

0.100

(2.54)

BSC

SEATING

PLANE

0.023 (0.58)

0.014 (0.36)

0.060 (1.52)

0.015 (0.38)

0.200 (5.08)

MAX

0.200 (5.08)

0.125 (3.18)

0.070 (1.78)

0.030 (0.76)

0.150

(3.81)

MAX

0.785 (19.94) MAX

0.320 (8.13)

0.290 (7.37)

0.015 (0.38)

0.008 (0.20)

0.250 (6.35) MIN

0.750 (19.05)

0.500 (12.70)

0.185 (4.70)

0.165 (4.19)

REFERENCE PLANE

0.050 (1.27) MAX

0.019 (0.48)

0.016 (0.41)

0.021 (0.53)

0.016 (0.41)

0.045 (1.14)

0.010 (0.25)

0.040 (1.02) MAX

BASE & SEATING PLANE

1

0.034 (0.86)

0.027 (0.69)

0.045 (1.14)

0.027 (0.69)

0.160 (4.06)

0.110 (2.79)

6

2

8

7

5

4

3

0.115

(2.92)

BSC

9

10

0.230 (5.84)

BSC

36

° BSC