m21315 Mindspeed Technologies, m21315 Datasheet - Page 12

• Manufacturer Part Number: m21315
• Description: M21315 Hd/sd-sdi Auto-rate Reclocker W/4 1 Selector
• Manufacturer: Mindspeed Technologies

Figure 1-3.
The high-speed output contains integrated 50Ω resistors from both DDO and DDO to VDDO_TERM.
VDDO_TERM should be bypassed to V
The output swing and common mode of the M21315 is the same as those of the GS1575B.
1.2.2.4
The reclocker frequency acquisition requires an external crystal connected to XTL_IN/XTL_IN. For daisy-chained
reclocker applications, a buffered reference output is made available on XTL_OUT/XTL_OUT.
The input reference frequency is 14.140 MHz. A 14.140 MHz series resonant crystal with the same form factor as
the GO1535 crystal should be used. The crystal should be connected as shown in
is recommended.
Figure 1-4.
The series resonant crystal should operate at 14.14MHz with a frequency stability of +/- 50 ppm or better,
equivalent series resistance of 80Ω or less, drive level of < 0.2 mW, and static capacitance of less than 5.0 pF.
21315-DSH-001-B
This resistor is used with a 14.14 MHz crystal
and should be approximately 56 ohms .
Crystal
Input circuit for DC/AC coupled General Case
Crystal Interface
Reclocker Reference Frequency
V
XTL_IN
XTL_IN
DD
or Input Common Mode
VDDI_TERMx
Mindspeed Technologies
Mindspeed Proprietary and Confidential
SS
DDIx
DDIx
with a 10nF capacitor. VDDO_TERM is internally biased to V
10nF
14.14 MHz
Buffer
50 Ω
50 Ω
XTAL
M21315
V
DD
®
8 kΩ
28 kΩ
Figure 1-4
To reclocker core
Functional Description
below. A 56Ω resistor
XTL_OUT
XTL_OUT
DD
.
6