AMBE2000 Datasheet, PDF (13/47 Pages) List of Unclassifed Manufacturers – VOCODER CHIP

AMBE-2000™ Vocoder Chip
User’s Manual Version 3.0
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 X2/CLKIN and CLKOUT Timing Diagram
X2/CLKIN
CLKOUT
t_c(CI)
t_w(CIH)
t_w(CIL)
t_r(CI)
t_f(CI)
tp
Unstable
t_d(CIH-CO)
t_c(CO)
t_w(COH)
t_f(CO)
t_w(COL)
t_r(CO)
Table 3-A X2/CLKIN and CLKOUT Timing Parameters
Reference
Parameter
Min
Max Units
t_c(CI)
Cycle time,
X2/CLKIN
Integer PLL multiplier N (N=4)
20
400
ns
t_f(CL)
Fall time, X2/CLKIN
4
ns
t_r(CL)
Rise time, X2/CLKIN
4
ns
t_w(CIL)
Pulse duration, X2/CLKIN low
6
ns
t_w(CIH)
Pulse duration, X2/CLKIN high
6
ns
t_p
Transitory phase, PLL lock-up time
50
µs
t_c(CO)
Cycle time, CLKOUT (typical is t_c(CI)/4
15
ns
t_d(CIH-CO) Delay time, X2/CLKIN high/low to CLKOUT high/low
4
16
ns
t_f(CO)/t_r(CO) Fall/Rise time, CLKOUT (typical is 2 ns)
T_w(COL)
Pulse duration, CLKOUT low
H-4
H
ns
T_w(COH)
Pulse duration, CLKOUT high
H-4
H
ns
•
CLKOUT is shown for reference only. It is not to be connected in the circuit.
•
H = 7.629 ns
page 13
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