E629AXF Semtech, E629AXF Datasheet - Page 4

• Manufacturer Part Number: E629AXF
• Manufacturer: Semtech

Specifications of E629AXF

• Lead Free Status / Rohs Status: Not Compliant

Introduction
The Edge629 is a quad channel delay element with 2
basic operating modes:
1) Fanout – 1 signal in, 4 signals out
2) Pass Through – 4 signals in, 4 signals out
In all modes, each channel supports 3 delay functions:
1) Coarse timing delay
2) Fine timing delay
3) Falling edge adjust
All 3 delay functions are independent of each other, and
independent for each channel.
The programming of the delay functions is done using a
16 bit register, loaded serially, which contains both a de-
lay and an address value.
TEST AND MEASUREMENT PRODUCTS
Circuit Description
2005 Semtech Corp. Rev. 3, 8/1/05
90 ps
180 ps
360 ps
Figure 1. Coarse Delay Architecture
LSB
720 ps
4
Coarse Delay
Coarse propagation delay adjustment is accomplished
using a series of gate delays and multiplexers (see Fig-
ure 1). Coarse delay provides a total delay span of:
Each channel has its own unique coarse delay setting and
may be programmed independently from all other chan-
nels. The coarse delay of any channel will not affect the
fine delay of that channel, nor will it affect the overall
delay of any other channel.
The propagation delay of a rising edge and falling edge
will track each other over the entire coarse delay span.
(Adding or subtracting coarse delay does not cause pulse
width distortion.)
0 ns
D
e
0
1
1 Coarse LSB = 90 ps
2 Coarse LSB = 180 ps
4 Coarse LSB = 360 ps
8 Coarse LSB = 720 ps
16 Coarse LSB = 1.44 ns
32 Coarse LSB = 2.88 ns
a l
MSB
0
1
0
1
y
0
1
C
Coarse Delay Range
0
1
o
0
1
d
Coarse Delay Register
16 Bit Serial Register
e
1.44 ns
M
M
x a
n i
m i
m i
u
u
m
m
D
D
l e
l e
y a
y a
2.88 ns
5.67 ns
Edge629
www.semtech.com
5
0
6 .
0 .
7
s n
s n