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參數(shù)資料
| 型號(hào)： | E629-EDGE629 |
| 英文描述： | 1 GHz Timing Deskew and Quad Fanout Element |
| 中文描述： | 1 GHz的定時(shí)偏移校正和四扇出元素 |
| 文件頁(yè)數(shù)： | 12/17頁(yè) |
| 文件大?。?/td> | 137K |
| 代理商： | E629-EDGE629 |
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4
2000 Semtech Corp.
www .semtech.com
HIGH-PERFORMANCE PRODUCTS – ATE
Edge629
TARGET
Circuit Description
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
delay and an address value.
Coarse Delay
Coarse propagation delay adjustment is accomplished
using a series of gate delays and multiplexers (see
Figure 1). Coarse delay provides a total delay span of:
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
0 ns
≤ Coarse Delay Range ≤ 5.67 ns
Each channel has its own unique coarse delay setting
and may be programmed independently from all other
channels. 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.)
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LSB
MSB
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16 Bit Serial Register
Coarse Delay Register
90 ps
180 ps
360 ps
720 ps
1.44 ns
2.88 ns
Figure 1. Coarse Delay Architecture
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