19-3530; Rev 0; 1/05
KIT
ATION
EVALU
E
BL
AVAILA
Low-Jitter, 8kHz Reference
Clock Synthesizer Outputs 35.328MHz
General Description
Features
o
8kHz Input-Reference CLK
o
4ps
RMS
(typ) Output Jitter
o
High-Jitter Rejection on the Reference CLK
o
Synthesizer Locks to the 8kHz Reference with a
鹵100ppm Range
o
Output Frequency: 35.328MHz
o
Six Buffered LVTTL Low-Jitter Outputs
o
One 8kHz Reference CLK Relay Output
o
+3.3V Supply Operation
o
24-Pin TSSOP Package
MAX9476
The MAX9476 low-cost, high-performance clock syn-
thesizer with an 8kHz input reference clock provides six
buffered LVTTL clock outputs at 35.328MHz. The clock
synthesizer can be used to generate the clocks for sys-
tems using T1, E1, T3, E3, and xDSL.
The MAX9476 features a phase-lock loop (PLL) that uses
a voltage-controlled crystal oscillator (VCXO). The inter-
nal PLL phase locks the external crystal (35.328MHz) to
the 8kHz input reference clock. In addition, this device
generates a jitter-suppressed output that provides a bet-
ter source for the reference clock relay.
The MAX9476 is available in a 24-pin TSSOP package
and operates over the extended operating temperature
range of -40擄C to +85擄C and a single +3V to +3.6V
power-supply range. For using lower value external
crystals, refer to the MAX9486 data sheet.
Applications
Telecom Equipment Using T1, E1, T3, E3, and
ISDN Protocols
xDSL Equipment in CO with Interface to the
Telecom Protocols
PART
MAX9476EUG
Ordering Information
TEMP RANGE
-40擄C to +85擄C
PIN-
PACKAGE
24 TSSOP
PKG
CODE
U24-1
Pin Configuration
TOP VIEW
SHDN 1
REO 2
REIN 3
V
DDP
4
GNDP 5
X1 6
V
DD
7
X2 8
GND 9
LP2 10
LP1 11
SETI 12
24 CLK1
23 GND
22 CLK2
21 V
DD
Typical Application Circuit
R
1
C
1
C
2
LP1
V
DDP
SETI
R
SET
GNDP
V
DD
SHDN
REIN
GND
LP2
X1
X2
V
DD
CLK1
CLK2
MAX9476
20 CLK3
19 V
DD
18 GND
17 CLK4
16 V
DD
15 CLK5
14 GND
13 CLK6
MAX9476
CLK3
CLK4
CLK5
CLK6
REO
TSSOP
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.
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