Rainbow-electronics MAX3646 Instrukcja Użytkownika Pobierz pdf (Strona 3)

MAX3646

155Mbps to 622Mbps SFF/SFP

Laser Driver with Extinction Ratio Control

_______________________________________________________________________________________ 3

Note 1: AC characterization is performed using the circuit in Figure 2 using a PRBS 2

- 1 or equivalent pattern.

Note 2: Specifications at -40°C are guaranteed by design and characterization.

Note 3: Excluding I

BIAS

and I

MOD

. Input data is AC-coupled. TX_FAULT open, SHUTDOWN open.

Note 4: Power-supply noise rejection (PSNR) = 20log

noise (on VCC

) / ∆V

OUT

). V

OUT

is the voltage across the 15Ω load when IN+

is high.

Note 5: The minimum required voltage at the OUT+ and OUT- pins is +0.75V.

Note 6: Guaranteed by design and characterization.

Note 7: Tested with 00001111 pattern at 622Mbps.

Note 8: DJ includes pulse-width distortion (PWD).

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

APC Loop Time Constant C

APC_FILT

= 0.01µF, ∆I

/ ∆I

BIAS

= 1/70 3.3 µs

APC Setting Stability (Note 6)

±100 ±480

ppm/°C

APC Setting Accuracy T

= +25°C ±15 %

MOD

Compensation-Setting

Range by Bias

KK = ∆I

MOD

/ ∆I

BIAS

0 1.5

mA/mA

MOD

Compensation-Setting

Range by Temperature

TC TC = ∆I

MOD

/ ∆T (Note 6) 0 1.0

mA/°C

Threshold-Setting Range for

Temperature Compensation

(Note 6)

+10 +60

°C

LASER SAFETY AND CONTROL

Bias and Modulation Turn-Off

Delay

APC_FILT

= 0.01µF, ∆I

/ ∆I

BIAS

= 1/80

(Note 6)

5µs

Bias and Modulation Turn-On

Delay

APC_FILT

= 0.01µF, ∆I

/ ∆I

BIAS

= 1/80

(Note 6)

600 µs

Threshold Voltage at Monitor Pins

REF

Figure 5

1.14

1.3

1.39

INTERFACE SIGNALS

TX_DISABLE Input High V

2.0 V

TX_DISABLE Input Low V

PULL

= 45kΩ (typical) 0.8 V

= V

TX_DISABLE Input Current

= GND -70

-140

µA

TX_FAULT Output Low Sinking 1mA, open collector 0.4 V

Shutdown Output High Sourcing 100µA

- 0.4

Shutdown Output Low Sinking 100µA 0.4 V

ELECTRICAL CHARACTERISTICS (continued)

= +2.97V to +3.63V, T

= -40°C to +85°C. Typical values are at V

= +3.3V, I

BIAS

= 60mA, I

MOD

= 60mA, T

= +25°C, unless

otherwise noted.) (Notes 1, 2)

1 2 3 4 5 6 7 8 ... 13 14

155Mbps to 622Mbps SFF/SFP 1

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