Rainbow Electronics MAX9476 - Manual

General Description
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
°C to +85°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
Features
♦ 8kHz Input-Reference CLK
♦ 4ps
RMS (typ) Output Jitter
♦ High-Jitter Rejection on the Reference CLK
♦ Synthesizer Locks to the 8kHz Reference with a
±100ppm Range
♦ Output Frequency: 35.328MHz
♦ Six Buffered LVTTL Low-Jitter Outputs
♦ One 8kHz Reference CLK Relay Output
♦ +3.3V Supply Operation
♦ 24-Pin TSSOP Package
MAX9476
Low-Jitter, 8kHz Reference
Clock Synthesizer Outputs 35.328MHz
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-3530; Rev 0; 1/05
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
PART TEMP RANGE
PIN-
PACKAGE
PKG
CODE
MAX9476EUG -40 °C to +85°C 24 TSSOP U24-1
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
CLK1
GND
CLK2
V
DD
V
DDP
REIN
REO
TOP VIEW
CLK3
V
DD
GND
CLK4 X2
V DD
X1
GNDP
16
15
14
13
9
10
11
12
V DD
CLK5
GND
CLK6 SETI
LP1
LP2
GND
TSSOP
MAX9476
SHDN
Pin Configuration
MAX9476
CLK2
X1
CLK1
V DDP
GNDP
X2
REO
CLK6
CLK5
CLK4
CLK3
GND
V DD
LP1 LP2
REIN
R SET
R 1
C 1
C 2
SETI
V DD
SHDN
Typical Application Circuit