Broadcom

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AFBR-1521CZ, AFBR-1531CZ, AFBR-1541CZ

Application Note

Further Details about the Recommended Driver Circuit (Figure 1)

Table 1 shows the average test data of three AFBR-1521CZ optical transmitters, placed in driver circuit (Figure 1) with components

Components installed are as follows: R1 = 4.7 k

(± 5%); R2 = 47(± 1%); R3 = 15(± 1%); C1 = 220 pF (± 5%).;

Table 2 shows the average test data of three AFBR-1521CZ optical transmitters, placed in driver circuit (Figure 1) with components

Components installed are as follows: R1 = 4.7 k

(± 5%); R2 = 130(± 1%); R3 = 43(± 1%); C1 = 180 pF (± 5%).

variation.

Table 1 Typical Values

Vcc (V)

PWD (ns)

Optical tr (ns)

Optical tf (ns)

Icc at Light OFF

(μA)

Icc at Light ON

(mA)

LOP Variation (Relative to

Vc c= 3.3V, TA = 25°C) (dB)

3.0

3.5

7.6

3.6

13.6

24.1

–1.5

3.3

3.3

6.7

3.8

15.4

29.7

–0.6

3.6

3.1

6.2

3.9

17.3

35.6

0.1

3.0

2.7

4.7

4.2

2.8

23.0

–1.0

3.3

2.6

4.3

4.4

3.3

28.7

0

3.6

2.5

4.0

4.3

4.0

34.7

0.8

3.0

2.3

2.7

3.5

0.3

21.0

–1.4

3.3

2.2

2.5

3.6

0.4

26.7

–0.4

3.6

2.2

2.4

3.7

0.5

32.7

0.5

Table 2 Typical Values

Vcc (V)

PWD (ns)

Optical tr (ns)

Optical tf (ns)

Icc at Light OFF

(μA)

Icc at Light ON

(mA)

LOP Variation (Relative to

Vcc = 3.3V, TA = 25°C) (dB)

3.0

4.2

6.2

3.3

13.9

10.1

–1.4

3.3

3.6

5.8

3.5

15.7

12.3

–0.4

3.6

3.4

5.2

3.5

17.6

14.7

0.4

3.0

3.6

5.1

4.2

2.9

9.6

–1.0

3.3

3.1

4.5

4.5

3.4

11.8

0

3.6

3.0

3.9

4.4

4.1

14.2

0.8

3.0

4.2

4.0

3.5

0.3

8.8

–1.4

3.3

3.6

3.0

3.7

0.4

11.0

–0.4

3.6

3.4

2.5

3.6

0.5

13.4

0.5