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GS9005B

GENLINX™ GS9005B Serial Digital Receiver

Gennum -> Semtech 

10µ

+

SSI

0.1µ

ANALOG

DIGITAL

-5V

0.1µ

-5V

-5V

0.1µ

390

4 3 2 1 28 27 26

-5V

ECL

390

INPUT 75

ED 75

0.1µ

-5V

47p

47p

DATA

INPUTS 5 DDI

6

DDI

7 VCC2

8 SDI

9 SDI

10 ƒ/2

11 VEE3

GS9005B

25

SDO

24

SDO

23

SCO

22

SCO

SS1 21

SS0 20

CD 19

12 13 14 15 16 17 18

D 113

N S 22n

5.6p

910

0.1µ

-5V

E N 10n

M IG ÷2

÷1

See Figure 18

100

100

100

100

390

390

10k

DATA

DATA

CLOCK

CLOCK

CARRIER

DETECT

OUTPUT

OM ES STAR

LOOP

-5V

-5V

-5V ROUTED

VOLTAGE

C D All resistors in ohms, all capacitors in microfarads, all inductors in henries unless otherwise stated.

RE W Fig. 15 GS9005B Typical Test Circuit Using -5V Supply

E VCO Frequency Setting Resistors

T N There are two modes of VCO operation available in the

GS9005B. When the ƒ/2 ENABLE (pin 10) is LOW, any of the

O four VCO frequency setting resistors, RVCO0 through RVCO3

N R (pins 13, 14, 15 and 17)maybeusedforanydatarate from 100

Mb/s to over 400 Mb/s. For example, for 143 Mb/s data

O rate, the value of the total RVCO resistance is approximately

F 6k8 and for 270 Mb/s operation, the value is approximately

The selection is dependent upon the level of the STANDARD

SELECT BIT, SS1 (pin 21). When SS1 is LOW, RVCO0 and

RVCO1 (pins 13 and 14) are used for the higher data rates.

When SS1 is HIGH, the VCO frequency is now twice the bit rate

and its frequency is set by RVCO2 and RVCO3 (pins 15 and

17).

For 143 Mb/s and 270 Mb/s operation, (the VCO is at 286 MHz

3k5. The 5k potentiometers will then tune the desired data and 270 MHz respectively) the total resistance required is

rate near their mid-points.

approximately the same for both data rates. This also applies

Jitter performance at the lower data rates (143, 177 Mb/s) is for 177 Mb/s and 360 Mb/s operation (the VCO is tuned

improved by operating the VCO at twice the normal frequency. to 354 MHz and 360 MHz respectively). This means that one

This is accomplished by enabling the ƒ/2 function which potentiometer may be used for each frequency pair with only

activates an additional divide by two block in the PLL section a small variation of the fixed resistor value. This halves the

of the GS9005B.

number of adjustments required.

When the ƒ/2 ENABLE is HIGH two of the RVCO pins are

assigned to data rates below 200 Mb/s and two are assigned

to data rates over 200 Mb/s.

10 of 10

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