Rainbow Electronics MAX3738 - Manual (Page 3)

MAX3738
1Gbps to 2.7Gbps 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 23 - 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
10 (V 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 2.7Gbps.
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 MD /
∆
I BIAS = 1/70 3.3 µs
APC Setting Stability (Note 6) ± 100 ± 480 ppm/ ° C
APC Setting Accuracy T A = +25 ° C ± 15 %
I MOD Compensation-Setting
Range by Bias
K K =
∆
I MOD /
∆
I BIAS 0 1.5 mA/mA
I MOD Compensation-Setting
Range by Temperature
TC TC = ∆ I MOD / ∆ T (Note 6) 0 1.0 mA/ ° C
Threshold-Setting Range for
Temperature Compensation
T TH (Note 6) +10 +60
°
C
LASER SAFETY AND CONTROL
Bias and Modulation Turn-Off
Delay C APC_FILT = 0.01µF,
∆
I MD /
∆
I BIAS = 1/80
(Note 6)
5 µs
Bias and Modulation Turn-On
Delay C APC_FILT = 0.01µF,
∆
I MD /
∆
I BIAS = 1/80
(Note 6)
600 µs
Threshold Voltage at Monitor Pins V REF Figure 5 1.14 1.3 1.39 V
INTERFACE SIGNALS
TX_DISABLE Input High V HI 2.0 V
TX_DISABLE Input Low V LO R PULL = 45k
Ω
(typ) 0.8 V
V HI = V CC 15
TX_DISABLE Input Current
V LO = GND -70 -140
µA
TX_FAULT Output Low Sinking 1mA, open collector 0.4 V
Shutdown Output High Sourcing 100µA V CC - 0.4 V
Shutdown Output Low Sinking 100µA 0.4 V
ELECTRICAL CHARACTERISTICS (continued)
(V CC = +2.97V to +3.63V, T A = -40°C to +85°C. Typical values are at V CC = +3.3V, I BIAS = 60mA, I MOD = 60mA, T A = +25°C, unless
otherwise noted.) (Notes 1, 2)