VITESSE
SEMICONDUCTOR CORPORATION
3.125Gb/s Integrated Transimpedance
and Limiting Amplifier with Signal Detect
Advance Product Information
VSC7969
Electrical Characteristics
Table 1: AC Specifications
Symbol
∆I
PH
I
PHS-AVG
Parameter
Input Photocurrent Swing
Min
Typ
Max
2.2
Units
mA
Conditions
Peak-to-peak AC current
amplitude
-23dBm average optical power
with a detector responsitivity of
0.8A/W.
-23dBm average optical power
with a detector responsitivity of
0.8A/W.
Single-ended peak-to-peak
measurement, I
IN
>20µA.
Differential peak-to-peak
measurement, I
IN
>20µA.
At 2.2mAp-p input photocurrent
swing. 20% to 80%.
Differential measurement
Modulation frequency between F
L
and BW
Referenced to 10MHz,
CPD = 0.6pF
Referenced to 10MHz, CPD =
0.6pF with no external
components
Single-ended
30kHz to 2.5GHz
Bias voltage on detector at 2.0V
Electrical measurement on SD pin
Average photocurrent with SD
open.
Average photocurrent with SD
open.
Average photocurrent with SD
shorted to ground.
Average photocurrent with SD
shorted to ground.
Average Photocurrent Sensitivity
4
µA
I
PHS-PEAK
∆V
OUT-SE
∆V
OUT-DIFF
t
R
, t
F
Z
T(1)
∆Z
T(1)
BW
Peak Input Photocurrent Sensitivity
Single-Ended Output Voltage
Amplitude
Differential Output Voltage Amplitude
Rise and Fall Time
Transimpedance Gain
Ripple in Passband Transimpedance
Upper -3dB Bandwidth
2.2
20k
8
µA
200
400
250
500
60
27k
1
2.5
300
600
100
40k
mV
mV
ps
Ω
dB
3.0
GHz
F
L
Z
O
PSRR
I
NOISE
C
PD
SD
H
SD
A-OPEN
SD
D-OPEN
SD
A-SHORT
SD
D-SHORT
SD
HIGH
SD
LOW
Lower -3dB Cutoff Frequency
Output Impedance
Power Supply Rejection Ratio
Input-Referred rms Noise Current
Photodetector Capacitance
Signal Detect Hysterisis
Signal Detect Assertion Level
Signal Detect Deasseration Level
Signal Detect Asseration Level
Signal Detect Deasseration Level
Signal Detect HIGH Logic Level
Signal Detect LOW Logic Level
0.4
1
3
1.0
6
2.0
50
TBD
500
0.6
2
5
2.2
10
4.4
V
CCS
- 0.3
0.5
100
kHz
Ω
nA
0.8
4
9
3.0
18
6.0
pF
dB
µA
µA
µA
µA
V
0.8
V
Page 2
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VITESSE
SEMICONDUCTOR CORPORATION
• 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
G52355-0, Rev 2.0
02/09/01
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
