
DS3106
10
6. Pin Descriptions
Table 6-1. Input Clock Pin Descriptions
PIN DESCRIPTION
REFCLK
I
Reference Clock. Connect to a 12.800MHz, high-accuracy, high-stability, low-noise local
oscillator (XO or TCXO). See Section
7.3.IC3
IPD
Input Clock 3. CMOS/TTL. Programmable frequency. Default frequency selected by IPF[2:0]
pins when the
RST pin goes high, 8kHz if IPF[2:0] pins left open.
IC4
IPD
Input Clock 4. CMOS/TTL. Programmable frequency. Default frequency selected by IPF[2:0]
pins when the
RST pin goes high, 8kHz if IPF[2:0] pins left open.
Table 6-2. Output Clock Pin Descriptions
PIN DESCRIPTION
OC3
O
Output Clock 3. CMOS/TTL. Programmable frequency. Default frequency selected by
O3F[2:0] pins when the
RST pin goes high, 19.44MHz if O3F[2:0] pins left open. See
TableOC6POS,
OC6NEG
ODIFF
Output Clock 6. LVDS/LVPECL. Programmable frequency. Default frequency selected by
O6F[2:0] pins when the
RST pin goes high, 38.88MHz if O6F[2:0] pins left open. The output
FSYNC
O3
8kHz FSYNC. CMOS/TTL. 8kHz frame sync or clock (default 50% duty cycle clock,
noninverted). The pulse polarity and width are selectable using
FSCR1.8KINV and
MFSYNC
O3
2kHz MFSYNC. CMOS/TTL. 2kHz frame sync or clock (default 50% duty cycle clock,
noninverted). The pulse polarity and width are selectable using
FSCR1.2KINV and