Datasheet

Data Sheet ADN2848
Rev. B | Page 11 of 12
V
CC
2
IMODN
GND2
IMODP
GND2
GND2
I
BIAS
CCBIAS
CLKN
CLKP
GND1
DATAP
DATAN
V
CC
1
PAVCAP
ERCAP
LBWSET
ASET
IBMON
IMMON
FAIL
DEGRADE
ERSET
PSET
IMPD
IMPDMON
GND4
V
CC
4
GND3
V
CC
3
ALS
FAIL
DEGRADE
CLKSEL
ALS
1kΩ
1.5kΩ
15kΩ
17
24
25
32
V
CC
V
CC
V
CC
10µH
LD
V
CC
MPD
*
*
*
**
**
1
8
1.5kΩ
9
16
1µF
1µF
10nF
10nF
10nF
10nF
CLKN
CLKP
DATAP
DATAN
10nF
10nF
10nF10nF
10µF
V
CC
GND
EACH V
CC
SHOULD HAVE BYPASS CAPACITORS AS CLOSE
AS POSSIBLE TO THE ACTUAL SUPPLY PINS ON THE
ADN2848 AND THE LASER DIODE USED.
CONSERVATIVE DECOUPLING WOULD INCLUDE 100pF
CAPACITORS IN PARALLEL WITH 10nF CAPACITORS.
LD = LASER DIODE
MPD = MONITOR PHOTODIODE
NOTES
DESIGNATES COMPONENTS THAT NEED TO BE OPTIMIZED FOR THE TYPE OF LASER USED.
FOR DIGITAL PROGRAMMING. THE ADN2850 OR THE ADN2860 OPTICAL SUPERVISOR CAN BE USED.
*
**
ADN2848
*
*
*
*
*
*
02746-009
+
R
Z
Figure 9. AC-Coupled 50 Mbps to 1.25 Gbps Test Circuit, Data Not Clocked
02746-010
Figure 10. A 1.244 Mbps Optical Eye. Temperature at 25°C.
Average Power = 0 dBm, Extinction Ratio = 10 dB, PRBS 31 Pattern,
1 Gb Ethernet Mask. Eye Obtained Using a DFB Laser.
02746-011
Figure 11. A 1.244 Mbps Optical Eye. Temperature at 85°C.
Average Power = 0 dBm, Extinction Ratio = 10 dBm, PRBS 31 Pattern,
1 Gb Ethernet Mask. Eye Obtained Using a DFB Laser.