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DSC2033

Page 2

MK-Q-B-P-D-12042609-2

DSC2033

Low-Jitter Configurable Dual LVDS Oscillator

Pin Description

Pin No.

Pin Name

Pin Type

Description

1

Enable

I

Enables outputs when high and disables when low

2

NC

NA

Leave unconnected or grounded

3

NC

NA

Leave unconnected or grounded

4

GND

Power

Ground

5

FS0

I

Least significant bit for frequency selection

6

FS1

I

Middle bit for frequency selection

7

FS2

I

Most significant bit for frequency selection

8

Output1+

O

Positive LVDS Output 1

9

Output1-

O

Negative LVDS Output 1

10

Output 2-

O

Negative LVDS Output 2

11

Output 2+

O

Positive LVDS Output 2

12

VDD2

Power

Power Supply 2 for LVDS Output 2

13

VDD

Power

Power Supply

14

NC

NA

Leave unconnected or grounded

Operational Description

The DSC2033 is a dual output LVDS oscillator

consisting of a MEMS resonator and a support

PLL IC.

The two outputs are generated

through

independent

8-bit

programmable

dividers from the output of the internal PLL.

Two constraints are imposed on the output

are even integers between 4 and 254, 2)

The actual frequencies output by the DSC2033

are controlled by an internal pre-programmed

memory (OTP).

This memory stores all

coefficients required by the PLL for up to eight

different frequency combinations.

Three

control pins (FS0 – FS2) select the output

frequency combination.

Discera supports

customer defined versions of the DSC2033.

Standard frequency options are described in in

the following sections.

When Enable (pin 1) is floated or connected to

VDD, the DSC2033 is in operational mode.

Driving Enable to ground will tri-state both

output drivers (hi-impedance mode).

Output Clock Frequencies

Table 1 lists the standard frequency configurations and the associated ordering information to be

used in conjunction with the ordering code above. Customer defined combinations are available.

Table 1. Pre-programmed pin-selectable output frequency combinations

Ordering

Info

Freq

(MHz)

Freq Select Bits [FS2, FS1, FS0] – Default is [111]

000

001

010

011

100

101

110

111

G0001

148.5

156.25

150

125

125

100

100

400

74.25

125

125

25

50

50

75

200

G0002

100

125

0

0

0

0

0

0

100

125

0

0

0

0

0

0

GXXXX

Contact factory for additional configurations.

Frequency select bit are weakly tied high so if left unconnected the default setting will be [1] and

the device will output the associated frequency highlighted in Bold.