6
Receiver Electrical Characteristics
Parameter Symbol Min. Typ. Max. Unit Notes
Di erential Output Voltage (pk-pk) V
DO
500 900 mV Note 1
Output Common Mode Voltage V
OCM
1.2 V Note 1
Data Output Rise Time (10%-90%) t
R
0.8 1.5 ns Note 1
Data Output Fall Time (90%-10%) t
F
0.8 1.5 ns Note 1
Duty Cycle Distortion DCD 1.0 ns Notes 1, 2
Data Dependent Jitter J
DD
1.2 ns Notes1, 2
Random Jitter J
R
2.14 ns Peak to peak, notes 1, 2, 3
RSSI Output Responsivity I
RSSI
/P
IN
0.45 A/W Fig. 5, 6
Voltage at RSSI Output V
RSSI
0V
CC
-1.5 V
Notes:
1. Characterized with LVDS termination (100 Ω)
2. Contributed by Rx only.
3. Based on BER=2.5x10
-10
Figure 5. Typical RSSI output voltage across R
RSSI
= 2 kΩ Figure 6. Typical responsivity vs. temperature
1
10
100
1000
-30 -20 -10 0
VRSSI - mV
PIN - OPTICAL INPUT POWER - dBm
0.2
0.3
0.4
0.5
0.6
0.7
0.8
-40 -20 0 20 40 60 80
IRSSI/PIN - A//W
T - TEMPERATURE - °C
Notes:
RSSI is actually a current output, providing an output current proportional to the coupled optical power. To provide a suitable monitoring voltage,
choose the value of R
RSSI
according to the particular optical power situation. For the characterization of the RSSI output responsivity, as shown in
gure 5, a 2 kΩ resistor was used. The lower the power, the higher the resistor value should be. However, do not override the max. limit of V
RSSI
.
Receiver Optical Characteristics
Parameter Symbol Min Typ Max Unit Notes
Unstressed receiver sensitivity,
(POF) for Fast Ethernet data rate (125 MBd)
CSEN
125
-26 dBm Note 1
Unstressed receiver sensitivity,
(POF) for data rate 250 Mbd
CSEN
250
-22 dBm Note 2
Input Optical Power Maximum, (POF) P
IN-MAX
-3.0 dBm Notes 1, 3
Operating Wavelength λ
C
635 650 675 nm
Assert input power level PA -29.5 dBm Notes 4, 5
De-assert input power level PD -31 dBm Notes 4, 5
Hysteresis between assert and de-assert PA-PD 1.0 dBm Note 5
Notes:
1. Measured with PRBS 2
7
-1 sequence at 125 MBd, BER < 2.5x10
-10
2. Measured with PRBS 2
7
-1 sequence at 250 MBd, BER < 2.5x10
-10
3. Input Optical Power Maximum is de ned as the maximum optical modulation amplitude where the receiver duty cycle distortion reaches ±1 ns.
4. Asserted and De-asserted levels are indicated as dB below unstressed receiver sensitivity level for POF.
5. There is an internal SD (signal detect) signal which is directly related to assert (PA) de-assert (PD) levels. There is no direct access to the SD signal,
however the Rx data outputs will squelch and the RSSI will switch o , once the optical input power falls below PD. Furthermore, the Rx data and
RSSI outputs will be activated, once the optical input power exceeds PA
