REV. A

–10–

AD807

NC = NO CONNECT

1

2

3

4

8

7

6

5

1

2

5

6

7

3

4

8

16

15

12

11

10

14

13

9

SDOUT

PIN

NIN

THRADJ

AD807

NC

NC

+OUT

–OUT

R10

154

R9

154

R6 100

C7

R5 100

R1

100

R2

100

C1 0.1µF

C2

0.1µF

C3

0.1µF

DATAOUTN

DATAOUTP

CLKOUTN

CLKOUTP

C4

0.1µF

C6

0.1µF

R4

100

R8 100

R7 100

R3

100

C8

R12

154

TP1

TP2

R11

154

C5

0.1µF

CD

TP7

SDOUT

C11

TP6

TP5

R13

THRADJ

C9

10µF

C10

GND

TP4

R14

50

R15

50

R16

301

R17

3.65k

C13

0.1µF

5V TP3

AD8015

C15

0.1µF

15pF

10µF

0.1µF

15pF

0.1µF

0.01µF

ABB HAFO 1A227

FC HOUSING

0.8 A/W, 0.7pF

2.5GHz

NOTES

1. ALL CAPS ARE CHIP,

15pF ARE MICA.

2. 150nH ARE SMT

C14

0.1µF

50

Ω

LINE

50

Ω

LINE

C12

2.2µF

150nH

150nH

DATAOUTN

DATAOUTP

CLKOUTN

CLKOUTP

CF1

CF2

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

Output Bit

Output Jitter

(dBm)

Error Rate

(ps rms)

–6.4

Loses Lock

–6.5

7.5

–6.6

9.4

–6.7

0

–7.0 to –35.5

0

<40

–36.0

3

<40

–36.5

4.8

–37.0

2.8

–38.0

1.3

–39.0

1.0

–39.2

1.9

–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 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.

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 24. Receiver Output (Data) Eye Diagram,

–7.0 dBm Optical Input

Figure 25. Receiver Output (Data) Eye Diagram,

–36.0 dBm Optical Input