Functional Description

21215-DSH-001-F

Mindspeed Technologies

®

4

Mindspeed Proprietary and Confidential

LPF/LPF

62/63

Loop Filter inputs on GS1535 that are left FLOATING on M21215.

Loop filter is internal. Leave pins floating.

-Analog

LBW_INC[1:0]

38,34

Input control signal used to increase the loop bandwidth (LBB) of the

M21215. LBW_INC[0] pin 34 can be used alone to increase the LBW of

the M21215 as a GS1535 compatible function.

LBW_INC[1:0] = 00: 5.0 MHz HD LBW, 1.4 MHz SD LBW

LBW_INC[1:0] = 01: 5.0 MHz HD LBW, 1.4 MHz SD LBW

LBW_INC[1:0] = 10: 3.5 MHz HD LBW, 1.0 MHz SD LBW

LBW_INC[1:0] = 11: (default) 1.5 MHz HD LBW, 0.52 MHz SD LBW

Internal pull up

I-CMOS

SWING/RSVD

39

Input control signal to reduce the output swing of the DDO/DDO outputs

This is an added function on the M21215 that is mapped to a RSVD pin

on the GS1535.

SWING = High: GS1535 compatible output levels (floating default)

SWING = Low: Reduced output swing

Internal pull up

I-CMOS

LVPECL/RSVD

40

Input control signal to shift the output common mode level to enable DC

coupling to downstream LVPECL receivers.

This is an added function on the M21215 that is mapped to a RSVD pin

on the GS1535.

LVPECL = High: GS1535 compatible output common-mode (floating

default)

LVPECL = Low: Common-mode shift for DC couple to LVPECL

Internal pull up

I-CMOS

N/C

29

Reserved testing pin, leave floating

-

-

NOTES:

1.

Internal pull-up/pull-down is 100 K

Ω.

2.

NAME/RSVD Indicates additional features of the M21215 that are mapped to the reserved pins of the GS1535. When left floating as

recommended by the GS1535 data sheet, the M21215 defaults to a pin for pin and functionally compatible mode.

Table 1-2.

Power Pins

Pin Name

Pin #

Function

Type

4,8,12,16,23,31,3

2,35,37,42,43,48,

49,54,60,64

Power Supply Ground

Power

22,41,47,55,

57,61

Positive Power Supply

Power

30

VCO Power Supply

This pin should be connected to a “quiet” power supply.

Power

Table 1-1.

Control/Interface/Low-Speed Pins (3 of 3)

Pin Name

Pin #

Function

Default

Type