ADN8102-EVALZ Analog Devices, ADN8102-EVALZ Datasheet - Page 25

• Manufacturer Part Number: ADN8102-EVALZ
• Description: 3.75 Gbps Quad Bidirectional CX4 Equalizer
• Manufacturer: Analog Devices

Table 15. Symbol Definitions for Output Levels vs. Setting
Symbol
V
V
dV
dV
I
I
I
V
V
SELECTIVE SQUELCH AND DISABLE
Each transmitter is equipped with output disable and output
squelch controls. Disable is a full power-down state: the trans-
mitter current is reduced to zero and the output pins pull up
to VTTO, but there is a delay of approximately 1 μs associated
with re-enabling the transmitter. The output disable control is
accessed through the EN bit (Bit 5) of the OUT_A/OUT_B
configuration registers through the I
Squelch is not a full power-down state but a state in which only
the output current is reduced to zero and the output pins pull
up to VTTO, and there is a much smaller delay to bring back
the output current. The output squelch and the output disable
control can both be accessed through the OUT_A/OUT_B
squelch control registers, with the top nibble representing the
squelch control for one entire output port and the bottom
nibble representing the output disable for one entire output
port. The ports are disabled or squelched by writing 0s to the
corresponding nibbles. The ports are enabled by writing all 1s,
which is the default setting. For example, to squelch Port A,
Register 0xC3 must be set to 0x0F. The entire nibble must be
written to all 0s for this functionality.
DC
PE
TOT
OD
OD
H
L
OCM_DC-COUPLED
OCM_AC-COUPLED
p-p
Formula
25 Ω × I
25 Ω × I
25 Ω × I
50 Ω × I
V
—
I
V
V
DC
OD
TTO
TTO
+ I
/R
− dV
− dV
TERM
PE
DC
DC
TOT
TOT
OCM
OCM
× 2 = 2 × V
/2 = V
/2 = V
2
C control interface.
+ V
− V
OD
OD
OD
OD
/2
/2
p-p/4 + (I
p-p/2 + (I
OD
PE
PE
/2 × 25)
/2 × 50)
Rev. A | Page 25 of 32
Table 16. Squelch Programming
Name
OUT_A/
OUT_B
Squelch
Control
Definition
Peak differential output voltage
Peak-to-peak differential output voltage
Output common-mode shift
Output common-mode shift
Output current that sets output level
Output current used for PE
Total transmitter output current
Maximum single-ended output voltage
Minimum single-ended output voltage
0xC3,
0xE3
Address
SQUELCH[3:0]
Data
DISABLE[3:0]
ADN8102
Default
0xFF