Rainbow Electronics MAX3737 - Manual (Page 3)

MAX3737
Multirate Laser Driver with Extinction
Ratio Control
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)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
5mA ≤ I
MOD
≤ 10mA ±20
Modulation-Current Setting Error
15 Ω load,
T A = +25°C 10mA < I MOD
≤ 85mA ±15
%
Modulation Off Current TX_DISABLE = high 0.1 mA
Modulation-Current Monitor Ratio I MOD /I MC_MON 223 262 302 mA/mA
EXTINCTION RATIO CONTROLS
M oni tor - D i od e Inp ut C ur r ent Rang e I MD Average current into the MD pin 18 1500 µA
MD Pin Voltage 1.4 V
MD-Current Monitor Ratio I MD /I PC_MON 0.85 1.0 1.15 mA/mA
APC Loop Time Constant C APC_FILT = 0.01µF, ∆I
MD / ∆I
BIAS = 1/70 3.3 µs
APC Setting Stability ±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 / ∆Τ (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 = 7.5k Ω 0.8 V
V HI = V CC 15
TX_DISABLE Input Current
V LO = GND -450 -800
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
Note 1: AC characterization is performed using the circuit in Figure 2 using a PRBS 2 23 - 1 or equivalent test 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 15 Ω 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).
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