Si5110
Rev. 1.4 31
J6 TXSQLCH I LVTTL Transmit Data Squelch.
When TXSQLCH is set low, the output data stream on
TXDOUT is forced to a zero state. Set TXSQLCH
high
for normal operation. The TXSQLCH
input is ignored
when operating in Line Loopback mode (LLBK
= 0).
Note: This input has an internal pullup.
D4–7, E4–6,
F4–6, G4–7
VDD VDD 1.8 V Supply Voltage.
Nominally 1.8 V.
G2 VDDIO VDDIO 1.8 V or 3.3 V
LVTTL I/O Supply Voltage.
Connect to either 1.8 or 3.3 V. When connected to
3.3 V, LVTTL compatible voltage swings are sup-
ported on the LVTTL inputs and LVTTL outputs of the
device.
B4 VREF O Voltage Ref
Voltage Reference.
The Si5110 provides an output voltage reference that
can be used by an external circuit to set the LOS
threshold, slicing level, or sampling phase adjustment.
The equivalent resistance between this pin and GND
should not be less than 10 k
Ω. The reference voltage
is nominally 1.25 V.
Pin
Number(s)
Name I/O Signal Level
Description
