Datasheet

REV. B
AD807
–10–
AD807
DATAOUTN
DATAOUTP
V
CC2
CLKOUTN
CF1
CF2
V
EE
SDOUT
PIN
NIN
AV
CC1
THRADJ
AV
EE
SDOUT
TP7
R14
50⍀
R15
50⍀
V
CC1
CLKOUTP
AV
CC2
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
TP5
TP1
TP2
CD
R5 100⍀
R6 100⍀
R10
154⍀
R9
154⍀
C7
R7 100⍀
R8 100⍀
C8
R12
154⍀
R11
154⍀
TP4
R2
100⍀
R1
100⍀
C2 0.1␮F
C3 0.1␮F
C4 0.1␮F
C5 0.1␮F
R4
100⍀
R3
100⍀
C2
0.1␮F
DATAOUTN
DATAOUTP
CLKOUTN
CLKOUTP
NOTES:
1. ALL CAPACITORS ARE CHIP,
15pF ARE MICA.
2. 150nH ARE SMT
3. C7, C8, C10, C11 ARE 0.1␮F
BYPASS CAPACITORS
C1 0.1␮F
J1
J2
J3
J4
TP6
R13
THRADJ
C10
C11
C15
0.1␮F
C14
0.1␮F
R16
301⍀
C12
2.2␮F
R17
3.65k⍀
C13
0.1␮F
NC
I
IN
NC
V
BYP
+V
S
+OUT
–V
S
–OUT
AD8015
1
2
3
4
8
7
6
5
ABB HAFO 1A227
FC HOUSING
0.8A/W, 0.7pF
2.5GHz
0.01␮F0.1␮F
NC = NO CONNECT
0.1␮F
10␮F
15pF
150nH
150nH
15pF
TP3
5V
C9
10␮F
50⍀
LINE
50⍀
LINE
Figure 14. Low Cost 155 Mbps Fiber Optic Receiver Schematic
Table I. AD807—AD8015 Fiber Optic Receiver Circuit:
Output Bit Error Rate and Output Jitter vs. Input Power
Average Optical
Input Power Output Bit Output Jitter
(dBm) Error Rate (ps rms)
–6.4 Loses Lock
–6.5 7.5 × 10
–3
–6.6 9.4 × 10
–4
–6.7 0 × 10
–14
–7.0 to –35.5 0 × 10
–14
<40
–36.0 3 × 10
–12
<40
–36.5 4.8 × 10
–10
–37.0 2.8 × 10
–8
–38.0 1.3 × 10
–5
–39.0 1.0 × 10
–3
–39.2 1.9 × 10
–3
–39.3 Loses Lock
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 14.
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
responsively, 0.7 pF capacitance, and 2.5 GHz bandwidth.
The AD8015 outputs (P
OUT
and N
OUT
) drive a differential,
constant 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 damp-
ing factor is set at 7 using a 0.22 µF capacitor.
503mV
100mV/
DIV
–497mV
48.12ns 1ns/DIV 58.12ns
Figure 15. Receiver Output (Data) Eye Diagram,
–7.0 dBm Optical Input
503mV
100mV/
DIV
–497mV
49.12ns 1ns/DIV 59.12ns
Figure 16. Receiver Output (Data) Eye Diagram,
–36.0 dBm Optical Input