800 MHz Clock Distribution IC, Dividers,
Delay Adjust, Three Outputs
AD9513
FEATURES
1.6 GHz differential clock input
3 programmable dividers
Divide-by in range from1 to 32
Phase select for coarse delay adjust
Three 800 MHz/250 MHz LVDS/CMOS clock outputs
Additive output jitter 300 fs rms
Time delays up to 11.6 ns
Device configured with 4-level logic pins
Space-saving, 32-lead LFCSP
FUNCTIONAL BLOCK DIAGRAM
RSET
VS
GND
AD9513
/1. . . /32
LVDS/CMOS
OUT0
OUT0B
LVDS/CMOS
CLK
/1. . . /32
CLKB
LVDS/CMOS
SYNCB
OUT1
OUT1B
APPLICATIONS
Low jitter, low phase noise clock distribution
Clocking high speed ADCs, DACs, DDSs, DDCs, DUCs, MxFEs
High performance wireless transceivers
High performance instrumentation
Broadband infrastructure
ATE
/1. . . /32
∆
t
OUT2
OUT2B
SETUP LOGIC
05595-001
VREF
S10
S9
S8
S7
S6
S5
S4
S3
S2
S1
S0
Figure 1.
GENERAL DESCRIPTION
The AD9513 features a three-output clock distribution IC in a
design that emphasizes low jitter and phase noise to maximize
data converter performance. Other applications with
demanding phase noise and jitter requirements also benefit
from this part.
There are three independent clock outputs that can be set to
either LVDS or CMOS levels. These outputs operate to
800 MHz in LVDS mode and to 250 MHz in CMOS mode.
Each output has a programmable divider that can be set to
divide by a selected set of integers ranging from 1 to 32. The
phase of one clock output relative to the other clock output can
be set by means of a divider phase select function that serves as
a coarse timing adjustment.
One of the outputs features a delay element with three selectable
full-scale delay values (1.8 ns, 6.0 ns, and 11.6 ns), each with
16 steps of fine adjustment.
The AD9513 does not require an external controller for
operation or setup. The device is programmed by means of
11 pins (S0 to S10) using 4-level logic. The programming pins
are internally biased to ⅓ V
S
. The VREF pin provides a level of
⅔ V
S
. V
S
(3.3 V) and GND (0 V) provide the other two logic levels.
The AD9513 is ideally suited for data converter clocking
applications where maximum converter performance is
achieved by encode signals with subpicosecond jitter.
The AD9513 is available in a 32-lead LFCSP and operates from
a single 3.3 V supply. The temperature range is −40°C to +85°C.
Rev. 0
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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