VITESSE

SEMICONDUCTOR CORPORATION

Advance Product Information

VSC7969

3.125Gb/s Integrated Transimpedance

and Limiting Amplifier with Signal Detect

Page 2

G52355-0, Rev 2.0

02/09/01

© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012

Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com

Internet: www.vitesse.com

Electrical Characteristics

Table 1: AC Specifications

Symbol

Parameter

Min

Typ

Max

Units

Conditions

∆I

PH

Input Photocurrent Swing

2.2

mA

Peak-to-peak AC current

amplitude

Average Photocurrent Sensitivity

4

µA

-23dBm average optical power

with a detector responsitivity of

0.8A/W.

Peak Input Photocurrent Sensitivity

8

µA

-23dBm average optical power

with a detector responsitivity of

0.8A/W.

∆V

OUT-SE

Single-Ended Output Voltage

Amplitude

200

250

300

mV

Single-ended peak-to-peak

∆V

OUT-DIFF

Differential Output Voltage Amplitude

400

500

600

mV

Differential peak-to-peak

Rise and Fall Time

60

100

ps

At 2.2mAp-p input photocurrent

swing. 20% to 80%.

(1)

Transimpedance Gain

20k

27k

40k

Ω

Differential measurement

∆Z

T

(1)

Ripple in Passband Transimpedance

1

dB

and BW

BW

Upper -3dB Bandwidth

2.2

2.5

3.0

GHz

Referenced to 10MHz,

CPD = 0.6pF

Lower -3dB Cutoff Frequency

100

kHz

Referenced to 10MHz, CPD =

0.6pF with no external

components

Output Impedance

50

Ω

Single-ended

PSRR

Power Supply Rejection Ratio

TBD

Input-Referred rms Noise Current

500

nA

30kHz to 2.5GHz

Photodetector Capacitance

0.4

0.6

0.8

pF

Bias voltage on detector at 2.0V

Signal Detect Hysterisis

1

2

4

dB

Electrical measurement on SD pin

Signal Detect Assertion Level

3

5

9

µA

Average photocurrent with SD

open.

Signal Detect Deasseration Level

1.0

2.2

3.0

µA

Average photocurrent with SD

open.

Signal Detect Asseration Level

6

10

18

µA

Average photocurrent with SD

shorted to ground.

Signal Detect Deasseration Level

2.0

4.4

6.0

µA

Average photocurrent with SD

shorted to ground.

Signal Detect HIGH Logic Level

- 0.3

V

Signal Detect LOW Logic Level

0.5

0.8

V