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AD808 Datasheet(PDF) 5 Page - Analog Devices

Part No. AD808
Description  Fiber Optic Receiver with Quantizer and Clock Recovery and Data Retiming
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD808 Datasheet(HTML) 5 Page - Analog Devices

 
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AD808
REV. 0
–5–
Damping Factor,
ζ
Damping factor,
ζ describes the compensation of the second
order PLL. A larger value of
ζ corresponds to more damping
and less peaking in the jitter transfer function.
Acquisition Time
This is the transient time, measured in bit periods, required for
the AD808 to lock onto input data from its free-running state.
Symmetry—Recovered Clock Duty Cycle
Symmetry is calculated as (100
× on time)/period, where on
time equals the time that the clock signal is greater than the
midpoint between its “0” level and its “1” level.
BINARY
OUTPUT
SCOPE
PROBE
AD808 QUANTIZER
VCM
VCM
4mVp-p
INPUT
a. Single-Ended Input Application
BINARY
OUTPUT
SCOPE
PROBE
AD808 QUANTIZER
VCM
VCM
2mVp-p
+INPUT
–INPUT
b. Differential Input Application
Figure 3. (a–b) Single-Ended and Differential Input
Applications
500
500
5k
5k
AVEE
AVCC
OUT
PIN
NIN
a. Quantizer Differential Input Stage
6k
THRADJ
AVEE
80k
1.2V +VBE
b. Threshold Adjust
30
VCC1
SDOUT
VEE
IOL
IOH
30
c. Signal Detect Output (SDOUT)
140
140
VCC2
DIFFERENTIAL
OUTPUT
VEE
7.8mA
d. PLL Differential Output Stage—DATAOUT(N),
CLKOUT(N)
Figure 4. (a–d) Simplified Schematics
The AD808 has internal circuits to set the common-mode volt-
age at the quantizer inputs PIN (Pin 13) and NIN (Pin 12) as
shown in Figure 4a. This allows very simple capacitive coupling
of the signal from the preamp in the AD808 as shown in Figure
3. The internal common-mode potential is a diode drop (ap-
proximately 0.8 V) below the positive supply as shown in Figure
4a. Since the common mode is referred to the positive supply, it
is useful to bypass the common mode of the preamp to the
positive supply as well, if this is an option. Note, it is not neces-
sary to use capacitive coupling of the input signal with the
AD808. Figure 14 shows the input common-mode voltage can
be externally set.


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