AMBE-1000 Digital Voice Systems, Inc., AMBE-1000 Datasheet - Page 64

• Manufacturer Part Number: AMBE-1000
• Manufacturer: Digital Voice Systems, Inc.

7.4
7.4.1
RESETN
The AMBE-1000 is not recommended for new designs.
CLK_I
Please refer to the AMBE-2000/2020 product line.
TTL Clock Source
Figure 7-B Hardware Reset Timing Diagram
Table 7-C Reset Timing Parameters
Crystal / Oscillator Usage
The AMBE-1000™ Vocoder Chip has an input clock frequency range of 26 to 30 MHz.
Three options are outlined below in providing this signal.
The following points should be noted when designing any printed circuit board layout:
When using a TTL source as the clock input, connect CLK_I and CLK_I2 as follows:
Figure 7-C CLK_I and CLK_I2 with TTL Clock Source
The device needs to be clocked for at least six CLK_I cycles during reset after
power-up. Otherwise, high currents may flow
Reference
t43
The AMBE-1000 is not recommended for new designs.
Keep the crystal and external capacitors as close to the CLK_I and CLK_I2
pins as possible to minimize board stray capacitance.
Keep CLK_I and CLK_I2 away from high frequency digital traces (example
CLK_O) to avoid coupling.
Please refer to the AMBE-2000/2020 product line.
Parameter
Reset Timing
TTL Clock Source
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V
DD
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CLK_I2 (pin 38)
CLK_I (pin 37)
AMBE-1000
Min
6T
Max
-
Units
ns