AD807
C1 0.1µF
SDOUT
C2
R1 R2
0.1µF 100 100
C3
0.1µF
C4
0.1µF
J3
R8 100
J4
C5
0.1µF
R3
100
C6
0.1µF
R4
100
R11
150
C8
0.1µF
R12
150 CD
0.1µF
R5 100
R6 100
R9 R10
154 154
C12 0.1
1
2
3
R7 100
C7 0.1µF
4
5
6
7
8
DATAOUTN
DATAOUTP
V
CC2
CLKOUTN
CLKOUTP
V
CC1
CF1
CF2
V
EE
16
R16
330
R14
47
R15
47
C14
0.1
C10
0.1
NOISE FILTER
3
C13
0.1
J1
J2
SDOUT 15
AV
CC2
14
C11 0.1
PIN 13
NIN
AV
CC1
THRADJ
12
11
10
9
R13
THRADJ
R17
3.9k
120nH
30pF
30pF
2
1
PIN TIA
EPITAXX
ERM504
1µF
AD807
AV
EE
NOTE
PIN TIA PIN 4 (CASE)
IS CONNECTED TO
GROUND
C9 10
+5V
Figure 26. AD807 Application with Epitaxx PIN—Transimpedance Amplifier Module
The entire circuit was enclosed in a shielded box. Table I sum-
marizes results of tests performed using a 2
23
-1 PRN Sequence,
and varying the average power at the PIN diode.
The circuit acquires and maintains lock with an average input
power as low as –39.25 dBm.
Table II. AD807—Epitaxx ERM504 PIN TIA 155 Mbps
Fiber Optic Receiver Circuit:
Output Bit Error Rate & Output Jitter vs. Average Input Power
250mV
50mV/
DIV
Average Optical
Input Power
(dBm)
0
–3
–10
–20
–30
–32
–34
–35
–35.5
–36
–37.0
–37.6
–38.0
Output Bit
Error Rate
0.0
×
10
0.0
×
10
–10
0.0
×
10
–10
0.0
×
10
–10
0.0
×
10
–10
0.0
×
10
–10
0.0
×
10
–10
0.0
×
10
–10
0.0
×
10
–10
0.0
×
10
–10
0.0
×
10
–10
0.5
×
10
–10
4
×
10
–6
–10
Output Jitter
(ps rms)
29
35
40
37
33
35
36
39
40
41
42
43
50
–250mV
38.12ns
1ns/DIV
48.12ns
Figure 27. Receiver Output (Data) Eye Diagram,
0 dBm Optical Input
250mV
50mV/
DIV
SONET (OC-3)/SDH (STM-1) Fiber Optic Receiver Circuit
A light wave receiver circuit for SONET/SDH application at
155 Mbps is shown in Figure 26, with test results given in Table
II. The circuit operates from a single +5 V supply, and uses two
major components: an Epitaxx ERM504 PIN-TIA module with
AGC, and the AD807 IC.
A 120 MHz, third order, low-pass Butterworth filter at the out-
put of the PIN-TIA module provides adequate bandwidth (70%
of the bit rate), and attenuates high frequency (out of band)
noise.
–250mV
38.12ns
1ns/DIV
48.12ns
Figure 28. Receiver Output (Data) Eye Diagram,
–38 dBm Optical Input
REV. A
–11–
AD [ ANALOG DEVICES ]
