REV. B

AD807

–11–

AD807

DATAOUTN

DATAOUTP

VCC2

CLKOUTN

CF1

CF2

VEE

SDOUT

PIN

NIN

AVCC1

THRADJ

AVEE

SDOUT

VCC1

CLKOUTP

AVCC2

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