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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 786K |
| 代理商： | ADN2820S21 |
ADN2820
OUTPUT OFFSET ADJUST INPUT
Long reach optical links may suffer from unbalanced 1 and 0
signal shaping due to dispersion and/or optical or avalanche
amplification noise. The ADN2820 enables the user to adjust
the input-referred slice level by adjusting the output offset with
the ADN2820’s outputs dc-coupled.
Rev. 0 | Page 9 of 12
With the OFFSET pad open (not bonded), the average output
voltage offset [OUT – OUTB] is internally balanced to be less
than ±5 mV. When externally driven by a voltage source, the
ADN2820 average output voltage offset [OUT – OUTB] is
linearly proportional to an applied OFFSET input voltage:
Applied Offset
(
V
) = (
OFFSET
(V) –
~1.6 V
) ×
OFFSET
GAIN
(mV/V)
where:
OFFSET
= voltage applied to the OFFSET pad
OFFSET
GAIN
=
120
mV/V
With transimpedance, T
Z
, the input referred slice adjust can be
calculated from the following equation:
Input Slice Adjust
= 1/
T
Z
× (
OFFSET
(V) –
~1.6 V
) ×
OFFSET
GAIN
(
mV
/
V
))
–50
–40
–30
–20
–10
0
10
20
30
40
50
I
μ
A
0
0.3
0.6
0.9
1.2
1.5
1.8
2.1
2.4
2.7
3.0
OFFSET CONTROL INPUT (V)
0
Figure 15. Input Slice Adjust vs. OFFSET Calculation Using Typical
[OUT,OUTB] vs. OFFSET Measurement Data
LOW FREQUENCY TRANSIMPEDANCE CUTOFF
CAPACITOR SELECTION
Digital encoding methods may generate long strings of 1s or 0s,
requiring the transimpedance amplifier pass band to extend to
1 MHz or below. To accommodate this requirement, the
ADN2820 has –3 dB low frequency transimpedance cutoff set
by external capacitor C
LF
. For C
LF
, values greater than 1000 pF,
the typical –3 dB low frequency transimpedance cutoff can be
estimated by the equation
f
–3dB
~ 2
kHz
× (1
μF
/
C
LF
)
Because
C
LF
is not part of the 10 Gbps signal chain, it is not
required to be a high frequency capacitor type. A ceramic
capacitor is recommended.
1k
10k
100k
1M
10M
100M
T
Z
–
0.1nF
1nF
1pF
10pF
10nF
0.1
μ
F
1
μ
F
EXTERNAL C
LF
CAPACITANCE VALUE
0
Figure 16. Low Frequency Transimpedance Cutoff vs. C
LF
Capacitance Using
Typical Data with a 0.1 μF Ceramic Capacitor and Simulation Results with
1 pF to 1 μF Capacitance
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