AD807
C1 0.1µF
SDOUT
TP7
C2
R1 R2
0.1µF 100 100
C3
0.1µF
C4
0.1µF
CLKOUTN
R8 100
CLKOUTP
C5
0.1µF
R3
100
C6
0.1µF
R4
100
C8 TP1
R11
154
R12
154
CD
TP2
8
CF2
R5 100
R6 100
R9 R10
154 154
R17
3.65k
C11
R14
50
R15
50
C12
2.2µF
R16
301
C13
0.1µF
DATAOUTN
DATAOUTP
1
2
3
DATAOUTN
DATAOUTP
V
CC2
CLKOUTN
CLKOUTP
V
CC1
CF1
V
EE
16
SDOUT 15
AV
CC
14
R7 100
C7
4
5
6
7
PIN 13
NIN
AV
CC
THRADJ
12
11
10
9
TP6
R13
THRADJ
TP5
C15
0.1µF
C14
0.1µF
C10
AD807
AV
EE
GND
TP4
C9
10µF
5V TP3
1 NC
2 I
IN
0.8 A/W, 0.7pF
2.5GHz
3 NC
4
0.1µF
0.01µF
V
BYP
+V
S
+OUT
–OUT
–V
S
8
7
0.1µF
10µF
50Ω
LINE
50Ω
LINE
ABB HAFO 1A227
FC HOUSING
NOTES
1. ALL CAPS ARE CHIP,
15pF ARE MICA.
2. 150nH ARE SMT
150nH
15pF
6
5
150nH 15pF
AD8015
NC = NO CONNECT
Figure 23. Low Cost 155 Mbps Fiber Optic Receiver Schematic
Table I. AD807—AD8015 Fiber Optic Receiver Circuit:
Output Bit Error Rate & Output Jitter vs. Input Power
Average Optical
Input Power
(dBm)
–6.4
–6.5
–6.6
–6.7
–7.0 to –35.5
–36.0
–36.5
–37.0
–38.0
–39.0
–39.2
–39.3
Output Bit
Error Rate
Loses Lock
7.5
×
10
–3
9.4
×
10
–4
0
×
10
–14
0
×
10
–14
3
×
10
–12
4.8
×
10
–10
2.8
×
10
–8
1.3
×
10
–5
1.0
×
10
–3
1.9
×
10
–3
Loses Lock
Output Jitter
(ps rms)
<40
<40
Figure 24. Receiver Output (Data) Eye Diagram,
–7.0 dBm Optical Input
APPLICATIONS
Low Cost 155 Mbps Fiber Optic Receiver
The AD807 and AD8015 can be used together for a complete
155 Mbps Fiber Optic Receiver (Quantizer and Clock Recovery,
and Transimpedance Amplifier) as shown in Figure 23.
The PIN diode front end is connected to a single mode 1300 nm
laser source. The PIN diode has 3.3 V reverse bias, 0.8 A/W re-
sponsively, 0.7 pF capacitance, and 2.5 GHz bandwidth.
The AD8015 outputs (P
OUT
and N
OUT
) drive a differential, con-
stant impedance (50
Ω)
low-pass filter with a 3 dB cutoff of
100 MHz. The outputs of the low-pass filter are ac coupled to
the AD807 inputs (PIN and NIN). The AD807 PLL damping
factor is set at 7 using a 0.22
µF
capacitor.
Figure 25. Receiver Output (Data) Eye Diagram,
–36.0 dBm Optical Input
–10–
REV. A
AD [ ANALOG DEVICES ]
