Rainbow Electronics MAX3795 - Manual (Page 3)

MAX3795
1Gbps to 4.25Gbps Multirate VCSEL Driver
with Diagnostic Monitors
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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, TC1 and TC2 are shorted, PEAKSET open, T A =
+25°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Bias Current During Fault I BIAS_OFF Current out of the BIAS pin 1.5 10 µA
1mA < I
BIAS
< 3mA 0.0875 0.105 0.1375
BIASMON Gain G BIASMON I BIASMON / I BIAS
3mA ≤ I
BIAS < 15mA 0.085 0.105 0.125
mA/mA
BIASMON Stability (Notes 2, 4) -10 +10 %
AUTOMATIC POWER CONTROL (APC)
MD Nominal Voltage V MD APC loop is closed 1
V REF -
0.2
2 V
Voltage at REF V REF 1.2 1.8 2.2 V
MD Voltage During Fault 0 V
MD Input Current Normal operation (FAULT = low) -2 0.7 +2 µA
APC Time Constant C COMP = 0.047µF, ∆I
PD / ∆I
LASER = 0.02 90 µs
PWRMON Nominal Gain V PWRMON / (V REF - V MD ) 1.85 2.15 2.45 V/V
LASER MODULATOR (Load is 50 Ω AC-Coupled to OUT+)
Minimum 0.25
Differential Input Voltage V ID
Maximum 2.4
V P-P
Input Common-Mode Voltage V CM 1.75 V
Differential Input Resistance R IN 85 100 115 Ω
Single-Ended Input Return Loss S11 f < 4GHz 12.7 dB
Differential Input Return Loss SDD11 f < 4GHz 11 dB
Minimum 2
Modulation Current I MOD
Current into OUT+
R
LOAD
≤ 50Ω
Maximum 15
mA
Laser Modulation During Fault or
Squelch Active
I MOD_OFF DC tested 15 50 µA P-P
Tolerance of Programmed
Modulation Current
TC1 is shorted to TC2 -10 +10 %
Minimum Peaking Current R PEAKSET = 10k Ω 0.2 mA
Maximum Peaking Current R PEAKSET = 1k Ω 2 mA
Peaking Current Duration 75 ps
Output Resistance R OUT Single-ended resistance 42 50 58 Ω
Minimum Programmable
Temperature Coefficient
0 ppm/°C
Maximum Programmable
Temperature Coefficient
Temperature range 0°C to +70°C +5000 ppm/°C
- 40°C to + 85° C 49 72
t R
50 Ω load, no peaking,
5mA ≤ I
MOD
≤ 15mA
+100°C 58
- 40°C to + 85° C 56 79
Modulation Transition Time
(Note 2)
t F
50 Ω load, no peaking,
5mA ≤ I
MOD
≤ 15mA
+100°C 64
ps