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參數(shù)資料
| 型號： | AMBE2000 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | VOCODER CHIP |
| 中文描述： | 聲碼器芯片 |
| 文件頁數(shù)： | 13/47頁 |
| 文件大小： | 324K |
| 代理商： | AMBE2000 |
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AMBE-2000 Vocoder Chip
User’s Manual Version 3.0
page 13
Visit us at
www.dvsinc.com
Confidential Proprietary, Subject to Change
3.3
Clock and Reset Timing
To reset the AMBE-2000 chip, the reset signal must be held low for a minimum of six clock cycles. The recovery time from
reset is approximately 95 msec. In other words, 95 msec after the rising edge of the reset signal the AMBE-2000 starts
processing PCM samples. The first packet will be ready after 252 PCM samples are read.
Figure 3-A X 2/ CLKI N and CLKOUT Timing Diagram
Table 3-A X 2/ CLKI N and CLKOUT Timing Parameters
Reference
Parameter
Min
Max
Units
t
c
(CI)
Cycle time,
X2/CLKIN
Fall time, X2/CLKIN
Rise time, X2/CLKIN
Pulse duration, X2/CLKIN low
Pulse duration, X2/CLKIN high
Transitory phase, PLL lock-up time
Cycle time, CLKOUT (typical is
t
c
(CI)/4
Delay time, X2/CLKIN high/low to CLKOUT high/low
Fall/Rise time, CLKOUT (typical is 2 ns)
Pulse duration, CLKOUT low
Pulse duration, CLKOUT high
CLKOUT is shown for reference only. It is not to be connected in the circuit.
Integer PLL multiplier N (N= 4)
20
400
ns
t
f
(CL)
t
r
(CL)
t
w
(CIL)
t
w
(CIH)
t
p
t
c
(CO)
t
d
(CIH-CO)
t
f
(CO)/t
r
(CO)
T
w
(COL)
T
w
(COH)
4
4
50
16
H
H
ns
ns
ns
ns
μ
s
ns
ns
ns
ns
6
6
15
4
H-4
H-4
H = 7.629 ns
~
~
~
Unstable
~
~
tp
t
c
(CI)
t
c
(CO)
t
d
(CIH-CO)
t
w
(CIH)
t
w
(CIL)
t
w
(COH)
t
w
(COL)
t
r
(CI)
t
f
(CI)
t
r
(CO)
t
f
(CO)
X2/CLKIN
CLKOUT
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