2

CDP6872

Simplified Block Diagram

FREQUENCY SELECTION TRUTH TABLE

ENABLE

FREQ 1

FREQ 2

SWITCH

OUTPUT RANGE

1

1

1

S1a, b, c

10kHz - 100kHz

1

1

0

S2

100kHz - 1MHz

1

0

1

S3

1MHz - 5MHz

1

0

0

S4

5MHz - 10MHz+

0

X

X

X

High Impedance

NOTE:

1. Logic input pull-up resistors are constant current source of 0.4

µA.

1 OF 4

DECODE

+

-

LEVEL

SHIFTER

BUFFER

BUFFER AMP

OSC IN 2

3 OSC OUT

EXTERNAL CRYSTAL

FREQ 1

FREQ 2

7

6

ENABLE

8

15pF

S1b

S1c

15pF

S1a

S2

S3

S4

4

5

OUTPUT

1

N

P

P

IN

OUT

OSCILLATOR

(NOTE 1)

(NOTE 1)

(NOTE 1)