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LOG102

10

SBOS211A

A

1

A

2

LOG102

Q

1

Q

2

A

3

R

2

R

3

R

2

5

10

3

7

4

R

3

C

C

V

LOGOUT

V

REF

I

REF

I

I

V

REF

R

1

V

• LOG

(

)

R

2

R

3

I

REF

I

PHOTO

I

1

I

2

14

1

I

PHOTO

A/D

R

1

V

FIGURE 13. High Side Shunt for Avalanche Photodiode (APD) Measures 3-Decades of APD Current.

A

1

–5V

SO-14

9

LOG102

Q

1

2

Q

2

I

OUT

I

10

1.2k

Ω

Receiver

Irx = 1

µA to 1mA

I to V

Converter

APD

10gbits/sec

1k

Ω

C

C

A

2

A

3

V

I

SHUNT

100

µA

500

5k

Ω

5k

Ω

+15V to +60V

+5V

25k

Ω

NOTE: (1) Available Q2 2002.

INA168

SOT23-5

2.5V

+5V

1

1

14

6

54

7

3