AEG Electrolux ERN 2922 User Manual download pdf (Page 58)

SOLID-STATE

DEVICES...

Rate

select

A )

23

Rate

select B

)22

Crystal

input

2)- =-

Crystal

output 2-

Reset )10

1.8432MHz

Oscillator

First

divider

01

xe

016

X64

Rate

select

logic

Dividers

1-)

F1

1r.-ÿF2

2-4F3

16

F4

3

F5

15 -;.

F6

4 -4

F7

6

F8

7 -4 F9

6 -4 F10

e.-,>

F11

14 -4

F12

13->F13

9 -4 F14

16)F15

19>F16

Fig. 2. Block diagram of MC14411 's internal

circuitry.

Two recent devices are equivalents of

popular

active filters: the S3528 pro-

grammable low

-pass

and S3529 pro-

grammable high -pass filter devices from

AMI /Gould Semiconductors. Both are

based on switched- capacitor techniques

and permit their cutoff frequencies to be

adjusted in 64 discrete steps by a 6 -bit

digital control

input.

The

S3528 has a

frequency range

of

40

Hz to 20 kHz, and the cutoff

frequency

can be set to a desired point

in

that range.

The 64 steps to select

from

can be custom

programmed from a universe of

2,048

possible points

via

an

internal 64

x

11

-bit

ROM.

An internal oscillator

sec-

tion uses an external 3.58

-MHz "color -

burst" crystal,

or it

can

use TTL

/CMOS

clock signals.

Attenuation

at

the

cutoff

frequency and above

is better than 51 dB.

The S3529 has identical specifications

and performance, but

it has a high -pass

filter function.

There

is another interesting similarity

between these two devices. Both require

a

constant + 5- and -5

-volt

dual -polarity

power source

and both have digital and

analog ground pins. The internal

circuit-

ry of these devices is a

combination of

linear

and digital stages,

so they are nei-

ther purely digital nor purely linear de-

vices.

Do

we

need a new descriptive term

for such ICs, such as "digilinear "?

Details

on

the 53528 and S3529, in-

cluding

cutoff

frequencies for

various

control inputs and applications

circuits,

are found in data sheets for

each

device

available from AMI

/Gould.

You can get

these from your nearest AMI

/Gould

dis-

Table II-

Output Frequency Multiplication Factors*

Output

x

64

x16 x8 x1

FI 614.4K 153.6K

76.8K

9,600

F2

460.8K 115.2K

57.6K

7,200

F3 307.2K

76.8K

38.4K

4,800

F4

230.4K

57.6K

28.8K

3,600

F5 153.6K

38.4K 19.2K 2,400

F6 115.2K 28.8K

14.4K 1,800

F7

76.8K

19.2K 9,600

1,200

F8 38.4K

9,600 4,800

600

F9

19.2K 4,800 2,400

300

F10 12.8K

3,200

1,600

200

F 1 1 9,600

2,400

1,200 150

F12 8,613.2 2,153.3 1,076.6 134.5

F13

7,035.5 1,758.8

879.4 109.9

F14 4,800 1,200

600

75

F15 921.6K 921.6K 921.6K

921.6K

F16 I.843M 1.843M

1.843M 1.843M

'All

output rates measured

in Hertz (Hz).

72 / MODERN

ELECTRONICS

/ February

1988

Say You Saw It In

Modern Electronics

1 2 ... 53 54 55 56 57 58 59 60 61 62 63 ... 79 80

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