Rainbow-electronics MAX3798 Bedienungsanleitung PDF herunterladen (Seite 11)

MAX3798

1.0625Gbps to 10.32Gbps, Integrated, Low-

Power SFP+ Limiting Amplifier and VCSEL Driver

______________________________________________________________________________________

Typical Operating Characteristics—VCSEL Driver

= 3.3V, T

= +25°C, unless otherwise specified. Figure 1 shows the typical setup used for measurements. Registers are set to

default values unless otherwise noted, and the 3-wire interface is static during measurements. For testing, the MODE_SEL bit was

used and the MSEL pin was left open.)

TOTAL SUPPLY CURRENT

vs. TEMPERATURE

MAX3798 toc17

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

806535 50-10 5 20-25

100

110

120

130

140

-40 95

BIAS

= 12mA

BIAS

= 9mA

BIAS

= 2mA

MOD

= 2mA; RECEIVER OUTPUT = 400mV

P-P

;

TOTAL SUPPLY MEASURED USING THE SETUP

IN FIGURE 1.

TOTAL SUPPLY CURRENT

vs. TEMPERATURE

MAX3798 toc18

TEMPERATURE (°C)

SUPPLY CURRENT (mA)

806535 50-10 5 20-25

100

110

120

130

140

150

160

-40 95

MOD

= 12mA

MOD

= 9mA

MOD

= 2mA

BIAS

= 2mA; RECEIVER OUTPUT = 400mV

P-P

;

TOTAL SUPPLY MEASURED USING THE SETUP

IN FIGURE 1.

OPTICAL EYE DIAGRAM

MAX3798 toc19

14ps/div

10.3Gbps, SET_IMOD = 60, 2

- 1 PRBS,

850nm VCSEL, MASK WITH 44%

OPTICAL EYE DIAGRAM

MAX3798 toc20

17ps/div

8.5Gbps, SET_IMOD = 60, 2

- 1 PRBS,

850nm VCSEL, MASK WITH 54%

OPTICAL EYE DIAGRAM

MAX3798 toc21

34ps/div

4.25Gbps, SET_IMOD = 60, 2

- 1 PRBS,

850nm VCSEL, MASK WITH 46%

OPTICAL EYE DIAGRAM

MAX3798 toc22

68ps/div

2.125Gbps, SET_IMOD = 60, 2

- 1 PRBS,

850nm VCSEL, MASK WITH 50%

DETERMINISTIC JITTER

vs. MODULATION CURRENT

MAX3798 toc23

MODULATION CURRENT (mA

P-P

)

DETERMINISTIC JITTER (ps)

10864

5.0

5.5

6.0

6.5

7.0

7.5

8.0

4.5

212

PATTERN = PRBS, DATA RATE = 10.32Gbps

TRANSITION TIME

vs. MODULATION CURRENT

MAX3798 toc24

MODULATION CURRENT (mA

P-P

)

TRANSITION TIME (ps)

10864

212

FALL TIME

RISE TIME

PATTERN = 11110000,

DATA RATE = 8.5Gbps

TRANSITION TIME

vs. DEEMPHASIS SETTING

MAX3798 toc25

SET_TXDE[3:0]

TRANSITION TIME (ps)

1091 2 3 5 6 74 8

011

FALL TIME

RISE TIME

PATTERN = 11110000,

DATA RATE = 8.5Gbps,

MOD

= 10mA

P-P

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 34 35

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