AD636JCHIP データシートの表示（PDF） - Analog Devices

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AD636JCHIP

Low Level, True RMS-to-DC Converter

Analog Devices 

AD636

Model

AD636J

Min

Typ

Max

AD636K

Min

Typ

Max

Units

TEMPERATURE RANGE

Rated Performance

Storage

0

+70

0

–55

+150

–55

+70

°C

+150

°C

TRANSISTOR COUNT

62

62

NOTES

1Accuracy specified for 0 mV to 200 mV rms, dc or 1 kHz sine wave input. Accuracy is degraded at higher rms signal levels.

2Measured at Pin 8 of DIP (IOUT), with Pin 9 tied to common.

3Error vs. crest factor is specified as additional error for a 200 mV rms rectangular pulse trim, pulse width = 200 µs.

4Input voltages are expressed in volts rms.

5With 10 kΩ pull down resistor from Pin 6 (BUF OUT) to –VS.

6With BUF input tied to Common.

Specifications subject to change without notice.

All min and max specifications are guaranteed. Specifications shown in boldface are tested on all production units at final electrical test and are used to calculate outgoing

quality levels.

ABSOLUTE MAXIMUM RATINGS1

Supply Voltage

Dual Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 16.5 V

Single Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +24 V

Internal Power Dissipation2 . . . . . . . . . . . . . . . . . . . . 500 mW

Maximum Input Voltage . . . . . . . . . . . . . . . . . . . . ± 12 V Peak

Storage Temperature Range N, R . . . . . . . . . –55°C to +150°C

Operating Temperature Range

AD636J/K . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C

Lead Temperature Range (Soldering 60 sec) . . . . . . . . +300°C

ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000 V

NOTES

1Stresses above those listed under Absolute Maximum Ratings may cause perma-

nent damage to the device. This is a stress rating only; functional operation of the

device at these or any other conditions above those indicated in the operational

section of this specification is not implied. Exposure to absolute maximum rating

conditions for extended periods may affect device reliability.

210-Lead Header: θJA = 150°C/Watt.

14-Lead Side Brazed Ceramic DIP: θJA = 95°C/Watt.

METALIZATION PHOTOGRAPH

Contact factory for latest dimensions.

Dimensions shown in inches and (mm).

+VS 14

0.1315 (3.340)

COM

RL

10

9

8 IOUT

0.0807

(2.050)

VIN

1a*

1b*

7 BUF IN

6 BUF OUT

3

45

–VS

CAV dB

PAD NUMBERS CORRESPOND TO PIN NUMBERS

FOR THE TO-116 14-PIN CERAMIC DIP PACKAGE.

NOTE

*BOTH PADS SHOWN MUST BE CONNECTED TO VIN.

ORDERING GUIDE

Model

AD636JD

AD636KD

AD636JH

AD636KH

AD636J Chip

AD636JD/+

Temperature

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

Package

Descriptions

Package

Options

Side Brazed Ceramic DIP D-14

Side Brazed Ceramic DIP D-14

Header

H-10A

Header

H-10A

Chip

Side Brazed Ceramic DIP D-14

STANDARD CONNECTION

The AD636 is simple to connect for the majority of high accu-

racy rms measurements, requiring only an external capacitor to

set the averaging time constant. The standard connection is

shown in Figure 1. In this configuration, the AD636 will mea-

sure the rms of the ac and dc level present at the input, but will

show an error for low frequency inputs as a function of the filter

capacitor, CAV, as shown in Figure 5. Thus, if a 4 µF capacitor

is used, the additional average error at 10 Hz will be 0.1%, at

3 Hz it will be 1%. The accuracy at higher frequencies will be

according to specification. If it is desired to reject the dc input, a

capacitor is added in series with the input, as shown in Fig-

ure 3; the capacitor must be nonpolar. If the AD636 is driven

with power supplies with a considerable amount of high frequency

ripple, it is advisable to bypass both supplies to ground with

0.1 µF ceramic discs as near the device as possible. CF is an

optional output ripple filter, as discussed elsewhere in this data

sheet.

CAV

–+

CF

(OPTIONAL)

VIN

–VS

VOUT

1

ABSOLUTE

14

VALUE

2 AD636

13

3

SQUARER

12

DIVIDER

4

11

5

CURRENT

10

MIRROR

6

9

+

10k⍀

7

BUF

–

8

10k⍀

+VS

+VS

10k⍀

+–

AD636

BUF

CURRENT

MIRROR

10k⍀

SQUARER

DIVIDER

ABSOLUTE

VIN

VALUE

CF

(OPTIONAL)

CAV

–VS

VOUT

REV. B

Figure 1. Standard RMS Connection

–3–

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