Datasheet

REV. B
AD807
–11–
AD807
DATAOUTN
DATAOUTP
V
CC2
CLKOUTN
CF1
CF2
V
EE
SDOUT
PIN
NIN
AV
CC1
THRADJ
AV
EE
SDOUT
V
CC1
CLKOUTP
AV
CC2
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
CD
R5 100⍀
R6 100⍀
R10
154⍀
R9
154⍀
C7 0.1␮F
R7 100⍀
R8 100⍀
C8
0.1␮F
R12
150⍀
R11
150⍀
R2
100⍀
R1
100⍀
C2 0.1␮F
C3 0.1␮F
C4 0.1␮F
C5 0.1␮F
R4
100⍀
R3
100⍀
C6
0.1␮F
C1 0.1␮F
J1
J2
J3
J4
R13
THRADJ
C11 0.1␮F
C10 0.1␮F
R14
47⍀
R15
47⍀
R16
330⍀
C9
10␮F
5V
C13
0.1␮F
C14
0.1␮F
30pF 30pF
NOISE FILTER
120nH
R17
3.9k⍀
C12
0.1␮F
EPITAXX
ERM504
1
2
PIN TIA
1␮F
NOTE:
PIN TIA PIN 4 (CASE)
IS CONNECTED TO
GROUND
Figure 17. 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 and
Output Jitter vs. Average Input Power
Average Optical
Input Power Output Bit Output Jitter
(dBm) Error Rate (ps rms)
0 0.0 × 10
–10
29
–3 0.0 × 10
–10
35
–10 0.0 × 10
–10
40
–20 0.0 × 10
–10
37
–30 0.0 × 10
–10
33
–32 0.0 × 10
–10
35
–34 0.0 × 10
–10
36
–35 0.0 × 10
–10
39
–35.5 0.0 × 10
–10
40
–36 0.0 × 10
–10
41
–37.0 0.0 × 10
–10
42
–37.6 0.5 × 10
–10
43
–38.0 4 × 10
–6
50
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 17, 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
output of the PIN-TIA module provides adequate bandwidth
(70% of the bit rate), and attenuates high frequency (out of
band) noise.
250mV
50mV/
DIV
–250mV
38.12ns 1ns/DIV 48.12ns
Figure 18. Receiver Output (Data) Eye Diagram,
0 dBm Optical Input
250mV
50mV/
DIV
–250mV
38.12ns 1ns/DIV 48.12ns
Figure 19. Receiver Output (Data) Eye Diagram,
–38 dBm Optical Input