SPPOSC Series

2” X 2”

(Low Distortion) 1 Hz to 102.4 kHz

Oscillators: Dual Channel

8 or 9-Bit Frequency Selectable

& Quadrature

2

1784 Chessie Lane, Ottawa, IL 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176

e-mail: sales@freqdev.com

• Web Address: http://www.freqdev.com

Frequency Selection Data Port

Data Format

•

Logic “0”

0VDC Min – 2VDC Max

•

Logic “1”

3.5VDC Min – 5Vdc Max

Bit Weighting (Binary Coded)

LSB

MSB

Frequency: 256:1 (8-bit dual),

or 512:1 (9-bit single)

____________________________________________

1.

The frequency selection data word bus consists of

programming.

2.

Select and requires a minimum of 21 µsecs set-up

time at a logic “1”, 5volts for channel 2 or logic “0”, 0

volts, for Channel 1

3.

For an 8-bit dual channel unit, the Program enable

this pin must be pulled to a logic high “1” or 5 volts.

If the pin is low, a frequency change will not be read

and the channels will continue to run the previous

values.

4.

New frequency selection data must be present or

updated at the time Channel select occurs to be

valid. The Program enable or “Latch” pin must be

high. While the latch pin is high, the Frequency data

must remain on the bus until the user applies the

next frequency change. The pins do not float during

programming! The frequency ports are polled by the

system every 21 µseconds. Within 21 µsecs of

programming, if the latch goes low, the programmed

values are retained and the pins may float.

Enable/Latch

Ch Sel

9-Bit Programming Table

MSB

---

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LSB

Bit

Weight

2

8

2

7

2

6

2

5

2

4

2

3

2

2

2

1

2

0

Corner

Frequency

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

1

0

0

0

0

0

0

0

1

1

0

0

0

0

0

0

1

1

1

0

0

0

0

0

1

1

1

1

0

0

0

0

1

1

1

1

1

0

0

0

1

1

1

1

1

1

0

0

1

1

1

1

1

1

1

0

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

8-Bit Programming Table

MSB

---

---

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LSB

Bit

Weight

2

7

2

6

2

5

2

4

2

3

2

2

2

1

2

0

Corner

Frequency

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

1

0

0

0

0

0

0

1

1

0

0

0

0

0

1

1

1

0

0

0

0

1

1

1

1

0

0

0

1

1

1

1

1

0

0

1

1

1

1

1

1

0

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

Tsu

21 µsecs min

DATA VALID

Frequency

Select