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參數(shù)資料
| 型號(hào)： | ADN2820S21 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 10.7 Gbps, 3.3V, Low Noise, TIA with Average Power Moniter |
| 中文描述： | 10.7 Gbps的，3.3，低噪聲，與平均功率監(jiān)視器行業(yè)協(xié)會(huì) |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 786K |
| 代理商： | ADN2820S21 |
ADN2820
APPLICATIONS
OPTICAL SENSITIVITY
Rev. 0 | Page 8 of 12
)
(
2
)
/
1000
(
)
+
(
)
/
(
log
10
)
(
10
ρ
×
×
+
α
×
=
ER
W
mW
ER
Z
V
I
dBm
y
Sensitivit
T
S
RMS
where:
ρ = photodiode responsivity (A/W), 0.85 A/W typical
I
RMS
= TIA input referred noise (A), typically 1.05 μA for the
ADN2820
α = BER factor, α = 14.1 for 10–12 BER
ER
= extinction ratio, 8 dB typical
V
S
= PA/CDR input sensitivity (V), 5 mV to 100 mV
Z
T
= TIA transimpedance (V/A), 5 kΩ for ADN2820
Table 5. Optical Sensitivity
Transimpedance (Z
T
)
2 k
5 k
–13.1
–15.7
–15.1
–17.1
–16.7
–18.1
–18.1
–18.8
–18.7
–19.0
Optical Input Sensitivity (dBm)
PA/CDR
Input
Sensitivity (V
S
)
Infinite
–19.3
–19.3
–19.3
–19.3
–19.3
100 mV
50 mV
25 mV
10 mV
5 mV
OPTICAL POWER MONITOR
Average optical power monitor (OPM) measurement is a
recommended diagnostic feature in module multisource
specification agreements (MSAs) such as the 300-pin 10 Gb
transponder (MSA300) and 10 Gb form factor pluggable
module (XFP) specifications.
The ADN2820 enables the simple calculation of OPM using the
POWMON output, which is linearly proportional to the average
input current. When monitoring the POWMON output,
connect to a high impedance input; typical POWMON output
impedance is 1 k. To disable the POWMON feature, leave the
pad floating (not bonded).
Assuming linear diode responsivity ρ, average input current is
linearly proportional to average input power:
I
IN,AVE
(A) = ρ (A/W) ×
P
IN,AVE
(W)
Ideally,
POWMON
(V) = ρ (A/W) ×
P
IN,AVE
(W) ×
POWMON
GAIN
(V/A) +
POWMON
OFFSET
(V)
From a
POWMON
measurement, the average input power can
be estimated by calculating the optical power monitor (
OPM
):
OPM
(W) = (
POWMON
(V) –
POWMON
OFFSET
(V))/(ρ (A/W)
×
POWMON
GAIN
(V/A))
OPM calculation from typical ADN2820 POWMON versus
I
IN,AVE
measurement data:
(
POWMON
OFFSET
= 20 mV,
POWMON
GAIN
= 1 V/mA, ρ =1 A/W)
–30
–25
–20
–15
–10
–5
0
O
–20
–15
–30
–25
–10
–5
0
AVERAGE INPUT POWER (dBm)
0
Figure 13. POWMON Transfer Function
–1.0
–0.6
–0.2
0.2
0.6
1.0
O
–20
–15
–30
–25
–10
–5
0
AVERAGE INPUT POWER (dBm)
0
Figure 14. POWMON Accuracy
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