MAX3882A Maxim Integrated Products, MAX3882A Datasheet - Page 9

• Manufacturer Part Number: MAX3882A
• Description: 2.488Gbps 1:4 Demultiplexer
• Manufacturer: Maxim Integrated Products

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threshold voltage. The +170mV to -170mV threshold
offset can be accomplished by varying the V
age from 0.3V to 2.1V, respectively. See Figure 2.
When using the V
setting, see Figure 8. Connect V
disable threshold adjust.
Figure 5. Functional Diagram
Figure 6. Open-Loop Transfer Function
H
O
(j2πf) (dB)
2.488Gbps 1:4 Demultiplexer with Clock and
FREFSET
V
SLBI+
SLBI-
C
f
LREF
SDI+
V
Z
SDI-
CTRL
FIL
SIS
REF
= 3.6kHz
= 0.068μF
1
REF
_______________________________________________________________________________________
REFERENCE
BANDGAP
to generate voltage for threshold
10
AMP
LOGIC
Data Recovery and Limiting Amplifier
C
f
Z
100
AMP
FIL
= 2.45kHz
= 0.01μF
CTRL
1000
directly to V
LOL
PFD
CAZ+
f = (kHz)
CANCELLATION
DC OFFSET
CTRL
CAZ
FIL
CAZ-
CC
LPF
V
CC
volt-
to
MAX3882A
0
1
VCO
A DC-offset cancellation loop is implemented to remove
the DC offset of the limiting amplifier. To minimize the
low-frequency pattern-dependent jitter associated with
this DC-cancellation loop, the low-frequency cutoff is
10kHz typical with CAZ = 0.1µF, connected across
CAZ+ and CAZ-.
Figure 7. Closed-Loop Transfer Function
PLL
D
CK
Q
H
O
-3
0
(j2πf) (dB)
DC-Offset Cancellation Loop Filter
DEMULTIPLEXER
1
4-BIT
DIV/4
10
C
FIL
100
LVDS
LVDS
LVDS
LVDS
LVDS
= 0.068μF
C
1000
FIL
= 0.01μF
PDO+
PDO-
PD1+
PD1-
PD2+
PD2-
PD3+
PD3-
PCLK+
PCLK-
f = (kHz)
9