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VSC7969
Data Sheet
Table 2. AC Characteristics for TO-46 Packages (WA-1A, WD-1A)
Symbol
OL
I
NOISE
OMA
I
PHS_PEAK
Parameter
Input optical power overload
(1)
Input-referred rms noise current
Optical modulation amplitude
(2)
Peak input photocurrent sensitivity
(2)
500
8.8
8
Min
Typ
Max
2.3
Unit
dBm
nArms
µWp-p
µA
–23dBm average optical
power with a detector respon-
sitivity of 0.95A/W.
1Hz to 2.5GHz, 0.6pF photo-
diode capacitance.
Condition
S
∆V
OUT_SE
∆V
OUT_DIFF
t
R
, t
F
R
D
∆Z
T
BW
F
L
Average optical power at sensitivity
(2)
Single-ended output voltage amplitude
Differential output voltage amplitude
Rise and fall times
Differential responsitivity
(1)
Ripple in passband transimpedance
(3)
Upper –3dB bandwidth
Lower –3dB cutoff frequency
12.8
180
360
-23
220
440
50
19.2
1
1.2
30
300
600
100
25.6
dBm
V
mV
ps
mV/µW
dB
GHz
kHz
Single-ended peak-to-peak
measurement. I
IN
= >40µAp-p.
Differential peak-to-peak mea-
surement. I
IN
= >40µAp-p.
At 2.2mAp-p input photo cur-
rent. 20% to 80%.
Peak-to-peak
Modulation frequency between
F
L
and BW.
Referenced to 50MHz, C
PD
=
0.6pF.
Referenced to 10MHz, C
PD
=
0.6pF, 0.1µF AC-coupling
capacitor.
Single-ended
Z
O
DC
R
J
D
J
Output resistance
Duty cycle
Random jitter
(4, 6)
50
47
50
28
28
53
Ω
%
ps
ps
Peak-to-peak, I
IN
= >30µAp-p.
Peak-to-peak I
IN
= >30µAp-p.
Deterministic jitter
(5, 6)
1.
Value calculated using photodiode responsitivity = 0.95A/W, extinction ratio = 10dB.
2.
Value calculated from I
NOISE
, BER = 1E -12, photodiode responsitivity = 0.95A/W, extinction ratio = 10dB.
3.
The differential transimpedance gain is defined as Z
T _DIFF
= (
∆
V
OUT_DIFFp-p
) / I
INp-p
, where V
OUT_DIFF
is the differential peak-to-peak
output voltage and I
IN
is the peak-to-peak input current.
4.
Using 1111100000 pattern at 2.5Gb/s to measure the standard deviation at the edge of the pattern, multiply the standard deviation by
14 to achieve the total random jitter.
5.
+K28.5 - K28.5 (00111110101100000101).
6.
Electrical measurement.
3 of 12
G52355, Rev 2.3
11/22/02
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
