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AC ELECTRICAL CHARACTERISTICS

ONET8531T

SLLS891 – FEBRUARY 2008

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Small signal transimpedance

2500

4500

6500

Ω

Small signal bandwidth

(1)

7

10

GHz

Low frequency –3 dB bandwidth

16

µA < I

30

100

kHz

Input referred RMS noise

0.9

1.6

µA

Unstressed sensitivity optical

–14

dBm

16

µA

6

11

PRBS31 pattern)

DJ

Deterministic jitter

500

µA

6

13

PRBS31 pattern)

Overload deterministic jitter

2000

µA

6

15

Maximum differential output

240

280

350

voltage

RSSI gain internal bias

0.48

0.5

0.52

A/A

RSSI internal bias output offset

3.5

10

16

µA

RSSI gain external bias

0.43

0.6

A/A

RSSI external bias output offset

25

µA

current (no light)

PSNR

Power supply noise rejection

–15

dB

(1)

The small signal bandwidth is specified over process corners, temperature, and supply voltage variation. The assumed photodiode

capacitance is 0.2 pF and the bond-wire inductance is 0.3 nH. The small signal bandwidth strongly depends on environmental parasitics.

Careful attention to layout parasitics and external components is necessary to achieve optimal performance.

(2)

Input referred RMS noise = (RMS output noise)

÷ (gain at 100 MHz).

(3)

The RSSI output is a current output, which requires a resistive load to ground (GND). The voltage gain can be adjusted for the intended

application by choosing the external resistor; however, for proper operation, ensure that the voltage at RSSI does not exceed

(4)

Offset is added to improve accuracy below 5

µA. When measured without input current (no light) the offset can be subtracted as a

constant offset from RSSI measurements.

(5)

PSNR is the differential output amplitude divided by the voltage ripple on supply; no input current at IN.

Copyright © 2008, Texas Instruments Incorporated

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